Compact micro servo steering engine mechanism

Abstract

The utility model discloses a compact micro servo steering engine mechanism, which comprises a direct current motor, a gear transmission mechanism, a box body mechanism and an output shaft, the direct-current motor is arranged on the box body mechanism, an output shaft of the direct-current motor is fixedly connected with the straight gear center shaft, and the direct-current motor drives the output shaft to rotate through the gear transmission mechanism; the gear transmission mechanism comprises two-stage transmission of meshing of a straight gear and a duplicate gear and meshing of the duplicate gear and a face gear. Compared with the prior art, the electric servo steering engine mechanism is compact in overall structure, adopts a direct current motor as a power source, and adopts a gear transmission mechanism combining a straight gear and a face gear, so that the axial and radial sizes of the servo steering engine are reduced, the transmission stability is improved, and the staggered shaft output of the electric servo steering engine mechanism is realized; the output shaft can rotate and keep at any angle within a certain range, and accurate control is achieved by controlling the direct current motor.

Description

Technical Field

[0001] The utility model belongs to the field of aviation structure design, and in particular relates to a compact micro servo steering mechanism. Background Art

[0002] As a servo actuator, electric servo actuators were first developed and applied to aircraft, missiles, rockets and other aircraft. They began to develop in the 1950s and have evolved from prototype to digital control. Electric servo actuators have many advantages, such as low steering power, light weight, low cost, no special difficulties in processing accuracy, assembly adjustment, material selection, and good reliability and maintainability. Early actuators had unstable performance and low accuracy and were only used for aircraft direction control in aerospace experiments. With the development of integrated circuit technology, digital actuators have emerged, which have higher control accuracy and stability, and can realize complex motion modes through programming. At the beginning of the 21st century, electric actuators developed further, integrating wireless communication modules to achieve remote control, and reducing size and weight, broadening application scenarios.

[0003] However, in recent years, portable small missiles have increasingly become a focus in the field of missile research and development. Their development trend of miniaturization, intelligence, high precision and high sensitivity has put forward higher requirements on the volume, quality, accuracy and transmission performance of micro precision servos.

[0004] Chinese utility model patent CN210981027U discloses a miniature missile servo, which uses a fan-shaped worm gear and a worm gear to achieve the transmission of the servo. However, the worm gear transmission has the disadvantages of low transmission efficiency, large size, high processing difficulty under miniature size, and easy wear.

[0005] Therefore, in order to meet the missile's requirements for the space size and transmission performance of the electric servo actuator, it is necessary to innovatively design the micro-precision actuator to improve the aircraft's air maneuverability and provide some improvement ideas for the research and development of small missile-related mechanisms. Utility Model Content

[0006] The utility model aims to provide a compact micro servo steering mechanism to solve the design of electric servo steering for portable small missiles in aerospace vehicles in a narrow space, so that the outer wing of the missile body can rotate and maintain within a certain range with the output shaft of the electric servo steering.

[0007] The technical solution for achieving the purpose of the utility model is: a compact micro servo steering mechanism, including a DC motor, a gear transmission mechanism, a box mechanism and an output shaft; the DC motor is arranged on the box mechanism, the output shaft of the DC motor is fixedly connected to the center shaft of the spur gear, and the DC motor rotates the output shaft through the gear transmission mechanism; wherein the gear transmission mechanism includes a two-stage transmission in which the spur gear and the duplex gear are meshed, and the duplex gear and the face gear are meshed.

[0008] The duplex gear comprises a first gear segment and a second gear segment; the first gear segment is meshed with the spur gear; and the second gear segment is meshed with the face gear.

[0009] The box mechanism comprises an upper box, a lower box and a support plate; the upper box mechanism and the lower box mechanism are fixedly connected, and the lower end of the upper box mechanism is fixedly connected with a support plate for installing a positioning gear transmission mechanism and a DC motor.

[0010] The gear transmission mechanism also includes a double gear shaft; the double gear shaft is rotatably mounted with the box mechanism, and the double gear is fixedly sleeved on the double gear shaft; the output shaft is rotatably mounted with the box mechanism, and the face gear is fixedly connected with the output shaft.

[0011] The double gear shaft and the box body mechanism are rotatably mounted through a shaft sleeve; the output shaft and the box body mechanism are rotatably mounted through a deep groove ball bearing.

[0012] The double gear shaft and the box body mechanism are axially limited by the double gear retaining ring; the output shaft and the box body mechanism are axially limited by the output shaft retaining ring.

[0013] The face gear is an incomplete sector gear.

[0014] The torque is transmitted between the face gear and the output shaft through a key.

[0015] Compared with the prior art, the utility model has the following significant advantages:

[0016] (1) The two-stage transmission structure of spur gears and incomplete face gears has small radial and axial dimensions and can be arranged in a narrow space;

[0017] (2) The overall structure is simple and refined, with low processing difficulty and easy installation;

[0018] (3) Compared with worm gear transmission, face gear transmission has higher transmission efficiency and less wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a half-section schematic diagram of the overall structure of the compact micro servo steering mechanism of the utility model.

[0020] Figure 2The utility model is a schematic diagram of the structure of a DC motor and a gear transmission mechanism of a compact micro servo steering mechanism.

[0021] Figure 3 It is a structural schematic diagram of the upper box mechanism and the lower box mechanism of the compact micro servo steering mechanism of the utility model.

[0022] Figure 4 It is a schematic diagram of the face gear structure of the compact micro servo steering mechanism of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Combination Figures 1 to 4 The utility model discloses a compact micro servo steering mechanism, the practical length of which does not exceed 70 mm, and the cross-section is enclosed in a rectangle of 20 mm*30 mm. The steering mechanism comprises: a DC motor 7, a gear transmission mechanism, an upper box mechanism, a lower box mechanism and a support plate 11; the DC motor 7 is arranged at the rear section of the upper box 6 and fixed by the upper box rear cover 8, the output shaft of the DC motor 7 is fixedly connected to the central rotating shaft of the spur gear 5 and drives the spur gear 5 to rotate, and then transmits the transmission to the double gear 12, and then transmits the transmission to the face gear 16, the face gear 16 is connected to the output shaft 2 by the flat key 4, so that the output shaft 2 is rotated by the driving force.

[0025] The gear transmission mechanism includes: a deep groove ball bearing 1, an output shaft 2, an output shaft retaining ring 3, a flat key 4, a spur gear 5, a duplex gear shaft 10, a duplex gear 12, a duplex gear shaft retaining ring 13, a sleeve 14, and a face gear 16; the spur gear 5 is meshed with the large gear segment of the duplex gear 12, the duplex gear 12 is sleeved on the duplex gear shaft 10 and the two are fixedly mounted to each other, the duplex gear shaft 10 is rotatably mounted with the upper box mechanism or the lower box mechanism through two sleeves 14; the duplex gear retaining ring 13 is sleeved on the duplex gear shaft 1, and the duplex gear 12 realizes an axial phase through the duplex gear retaining ring 13. The pinion end of the duplex gear 12 meshes with the face gear 16, and the face gear 16 is connected to the output shaft 2 via a flat key 4 to transmit torque; two deep groove ball bearings 1 are sleeved on the upper and lower ends of the output shaft 2, and the output shaft 2 is rotatably mounted with the upper box mechanism or the lower box mechanism through the deep groove ball bearings 1; an output shaft retaining ring 3 is used between the upper deep groove ball bearing 1 and the face gear 16 to axially limit the face gear 16 and the output shaft 2.

[0026] The upper housing mechanism comprises an upper housing 6, an upper housing rear cover 8, and screws 9 (five of which are provided); the cylindrical cavity at the rear section of the upper housing 6 is used to place the DC motor 7, and the upper housing 6, the upper housing rear cover 8, and the screws 9 work together to fix the DC motor 7, and the DC motor 7 is installed at the rear end of the upper housing 6; in the space formed between the upper housing 6 and the lower housing 15, the support plate 11 is fixedly connected to the upper housing 6 by a screw 9. The circular step and hole at the front section of the upper housing 6 are used to install the deep groove ball bearing 1 at the upper end of the output shaft 2, so as to realize the positioning of the deep groove ball bearing 1 and the output shaft 2 relative to the upper housing 6 of the servo. There are two symmetrically arranged cylindrical protrusions on the side close to the circular step, which play a role in limiting the maximum rotation angle of the opposite gear 16. The upper housing 6 cooperates with the lower housing 15 and is connected and fixed by two screws 9.

[0027] The lower box mechanism includes a lower box 15, a support plate 11, and two screws 9; the annular step of the lower box 15 is used for positioning and installing the deep groove ball bearing 1 at the lower end of the output shaft 2, and the supporting hole in the middle of the lower box 15 cooperates with the supporting hole of the support plate 11 to arrange the double gear shaft 10, the double gear 12, two shaft sleeves 14 and the double gear shaft retaining ring 13, so as to realize the axial positioning of the double gear 12 on the double gear shaft 10.

[0028] The face gear 16 is an incomplete sector gear, with only a portion of its teeth, which greatly reduces the axial and radial dimensions and the overall size of the electric servo steering gear, so that the gear transmission mechanism can be arranged in a narrow space. In order to prevent the face gear 16 from being disengaged from the double gear 12 during rotation, two cylindrical protrusions symmetrically arranged on the upper box body 6 block the two sides of the face gear 16, thereby achieving a limiting effect on the face gear 16.

[0029] The working process of a compact micro servo steering mechanism disclosed in the utility model is as follows:

[0030] The DC motor 7 drives the spur gear 5 connected thereto, and the spur gear 5 drives the double gear 12 to rotate, and the double gear 12 is driven to drive the face gear 16 to rotate, and the face gear 16 transmits torque to the output shaft 2 through the flat key 4 and the keyway on the output shaft 2, and the output shaft 2 rotates under the driving force. The output shaft 2 can rotate and maintain any angle within a certain range through the control of the DC motor 7.

Claims

1. A compact micro servo mechanism, characterized in that: It comprises a DC motor (7), a gear transmission mechanism, a box mechanism and an output shaft (2); the DC motor (7) is arranged on the box mechanism, the output shaft of the DC motor (7) is fixedly connected to the central shaft of the spur gear (5), and the DC motor (7) causes the output shaft (2) to rotate through the gear transmission mechanism; The gear transmission mechanism comprises a two-stage transmission in which the spur gear (5) is meshed with the double gear (12), and the double gear (12) is meshed with the face gear (16).

2. The compact micro servo steering mechanism according to claim 1, characterized in that: The double gear comprises a first gear segment and a second gear segment; the first gear segment is meshed with the spur gear (5); and the second gear segment is meshed with the face gear (16).

3. The compact micro servo steering mechanism according to claim 1, characterized in that: The box mechanism comprises an upper box mechanism (6), a lower box mechanism (15) and a support plate (11); the upper box mechanism (6) and the lower box mechanism (15) are fixedly connected, and the lower end of the upper box mechanism (6) is fixedly connected to the support plate (11) for mounting a positioning gear transmission mechanism and a DC motor (7).

4. The compact micro servo steering mechanism according to claim 1, characterized in that: The gear transmission mechanism also includes a double gear shaft (10); the double gear shaft (10) is rotatably mounted on the box mechanism, and the double gear (12) is fixedly sleeved on the double gear shaft (10); the output shaft (2) is rotatably mounted on the box mechanism, and the face gear (16) is fixedly connected to the output shaft (2).

5. The compact micro servo steering mechanism according to claim 4, characterized in that: The double gear shaft (10) and the box body mechanism are rotatably mounted via a shaft sleeve (14); the output shaft (2) and the box body mechanism are rotatably mounted via a deep groove ball bearing (1).

6. The compact micro servo steering mechanism according to claim 5, characterized in that: The double gear shaft (10) and the box body mechanism are axially limited by a double gear retaining ring (13); the output shaft (2) and the box body mechanism are axially limited by an output shaft retaining ring (3).

7. The compact micro servo steering mechanism according to claim 1, characterized in that: The face gear (16) is an incomplete sector gear.

8. The compact micro servo steering mechanism according to claim 4, characterized in that: The torque is transmitted between the face gear (16) and the output shaft (2) via a key.

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