Self-locking gear transmission shaft

Abstract

The utility model relates to a self-locking gear transmission shaft which comprises a shaft body, the shaft body is provided with a long shaft section, a short shaft section and a worm section used for being in transmission connection with a worm gear, the worm section is located between the long shaft section and the short shaft section, and teeth used for being meshed with a gear are annularly arranged on the long shaft section or the short shaft section. According to the technical scheme, the shaft body of the transmission shaft can be self-locked through the worm section of the transmission shaft, the mechanical arm can be kept balanced when encountering external torque, accuracy and stability can be guaranteed, meanwhile, additional monitoring means do not need to be applied, and the complexity and cost of design and maintenance of the mechanical arm are low.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission shafts, and more specifically to a self-locking gear transmission shaft. Background Art

[0002] A manipulator, also known as a robotic arm, is an automatic control device used to simulate the movements of a human arm. A manipulator is usually composed of multiple joints, each of which can perform relatively independent movements such as sliding and rotating relative to the previous joint, which also enables the manipulator to simulate various movements of a human hand such as grasping, holding, lifting, and placing.

[0003] The transmission shaft is one of the key components for the robot to achieve rotational movement. It is also a general term for shaft parts such as gear shafts. In the structure of the robot, the transmission shaft carries the torque transmitted by the drive device and transmits it to the various joints and actuators of the robot, thereby realizing the rotational movement of the robot. The utility model patent with announcement number CN202659703U applied by our company on January 9, 2013 discloses a gear shaft, which includes a shaft body and gear teeth connected to the shaft body. A keyway and a groove are provided at one end of the shaft body, and the angle between the keyway and the groove in the radial direction is 80°~180°.

[0004] The main problem with the above-mentioned drive shaft is the lack of a self-locking structure, which makes the drive shaft prone to accidental movement when encountering external torque. In particular, when it is necessary to maintain a fixed position or a fixed load, it cannot effectively prevent accidental movement, causing the manipulator to lose control, which in turn brings certain safety hazards. When precise position control or stable movement is required, it may not be able to maintain the required accuracy and stability, affecting the actual operating effect of the manipulator. In addition, this also leads to the need for additional monitoring means to monitor the activities of the manipulator, increasing the complexity and cost of the manipulator design and maintenance. Utility Model Content

[0005] In view of the above situation, in order to overcome the problem that the transmission shaft of the manipulator in the above-mentioned prior art lacks a self-locking structure, which leads to the transmission shaft being prone to accidental movement when encountering external torque, causing the manipulator to lose control and unable to maintain the required accuracy and stability, and also leads to the need to apply additional monitoring measures, resulting in increased complexity and cost of robot arm design and maintenance, the purpose of the utility model is to provide a gear transmission shaft that can self-lock, maintain the balance of the manipulator when encountering external torque, and ensure accuracy and stability, without the need for additional monitoring measures, thereby reducing the complexity and cost of robot arm design and maintenance.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A self-locking gear transmission shaft comprises a shaft body having a long shaft section, a short shaft section and a worm section for connecting with a worm gear transmission, wherein the worm section is located between the long shaft section and the short shaft section, and teeth for meshing with gears are arranged on the long shaft section or the short shaft section.

[0008] Preferably, a ring platform is formed on the long shaft section, and the teeth are located on the ring platform.

[0009] Preferably, the teeth are helical teeth.

[0010] Preferably, the long shaft section has a rotor assembly position located between the worm section and the ring stage.

[0011] Preferably, a keyway is provided on the long shaft section of the ring platform on the side away from the worm section.

[0012] Preferably, a straight anti-skid groove axially parallel to the keyway is formed on the long shaft section.

[0013] Preferably, a flat shaft portion for rotation of a flat shaft wrench is formed at the free end of the long shaft section.

[0014] Preferably, a bearing assembly position close to the worm section is formed on the short shaft section.

[0015] Preferably, a thread groove for cooperating with a nut is formed at the free end of the short shaft section.

[0016] Preferably, the length ratio of the short shaft section, the worm section and the long shaft section is 5:9:15.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] (1) The transmission shaft of the utility model utilizes the meshing of teeth on the long shaft section or the short shaft section with gears to transmit the power of the power source. The gear transmission has a high transmission efficiency, can effectively undertake the power output of the power source, and has a high transmission accuracy. When precise position control or stable movement is required, the actual operation effect of the configured manipulator is significantly improved. At the same time, it can realize the smooth transmission of the power source power. It can also utilize the meshing of teeth with gears of different specifications to obtain different transmission ratios, thereby realizing the speed change function of the manipulator.

[0019] (2) The drive shaft of the utility model utilizes a worm segment with a larger lead to convert the rotational motion of the shaft into linear motion through helical meshing, thereby realizing the transmission of large torque. The worm segment has self-locking properties. When the worm stops rotating with the shaft, the meshing worm wheel stops moving. The worm wheel cannot rotate spontaneously due to the friction force, thereby preventing the worm wheel from rotating in the opposite direction under the action of other external torques, thereby keeping the entire manipulator stable, preventing loss of control, and ensuring safer operation of the manipulator. In addition, the additional design that needs to monitor the activities of the manipulator is simplified, so that the complexity and cost of the design and maintenance of the entire manipulator can be reduced. In addition, the transmission of the worm segment and the worm wheel is a helical transmission, which can further improve the smoothness and quietness of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the transmission shaft of the utility model;

[0021] Figure 2 This utility model Figure 1 Schematic diagram of the AA section structure;

[0022] Figure 3 This is a schematic diagram of the overall structure of the transmission shaft of the utility model from another perspective;

[0023] Figure 4 This utility model Figure 3 A schematic diagram of the enlarged structure of part A;

[0024] Figure 5 This utility model Figure 3 Schematic diagram of the enlarged structure of part B.

[0025] As shown in the figure:

[0026] 1. Long shaft section; 101. Tooth; 102. Ring; 103. Rotor assembly position; 104. Keyway; 105. Straight anti-skid groove; 106. Flat shaft position; 2. Short shaft section; 201. Bearing assembly position; 202. Thread groove; 3. Worm section. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of simplifying the description, and do not indicate or imply that the directions are specific directions that must be possessed and specific directions, structures, and operations, and therefore should not be understood as limitations on the present utility model.

[0029] like Figures 1 to 3 As shown, the utility model relates to a self-locking gear transmission shaft, which includes a shaft body as a main body, and the shaft body is composed of three parts: a long shaft section 1, a short shaft section 2 and a worm section 3. The long shaft section 1 and the short shaft section 2 are relative to each other, that is, the length of the long shaft section 1 is greater than the short shaft section 2, and the worm section 3 is located between the long shaft section 1 and the short shaft section 2. The outer surface of the worm section 3 is spiral and is used to mesh with the worm wheel. In the meshing state, when the transmission shaft of the utility model rotates, the worm wheel presents a linear displacement under the action of the worm section 3 to achieve power transmission. Teeth 101 are arranged on the long shaft section 1 or the short shaft section 2. This part of the teeth 101 is used to mesh with the gear. The meshed gear is used as the power transmission medium of the power source, and its own rotation drives the entire shaft body to rotate, so as to achieve the rotation of the configured manipulator joint. Compared with the general transmission shaft, the gear transmission has a higher transmission efficiency, can effectively undertake the power output of the power source, and has a higher transmission accuracy. It is very suitable for situations where precise position control or stable movement is required. The actual operation effect of the configured manipulator can be significantly improved, and at the same time, the smooth transmission of the power of the power source can be achieved. Different transmission ratios can be obtained by utilizing the meshing of the teeth 101 with gears of different specifications to realize the speed change function of the manipulator. In addition, the transmission shaft of the utility model utilizes the worm segment 3 with a larger lead to convert the rotational motion of the shaft into linear motion through spiral meshing, thereby realizing the transmission of large torque, and the worm segment 3 has self-locking property. When the worm stops rotating with the shaft, the meshing worm wheel stops moving. The worm wheel cannot rotate spontaneously due to the friction force, thereby avoiding the worm wheel from rotating in the opposite direction under the action of other external torques, thereby keeping the entire manipulator stable, preventing loss of control, and ensuring the safer operation of the manipulator. Correspondingly, the additional design that needs to monitor the activities of the manipulator is simplified, so that the complexity and cost of the design and maintenance of the entire manipulator can be reduced. In addition, the transmission of the worm segment 3 and the worm wheel is a spiral transmission, so the stability and quietness of the transmission can be further improved.

[0030] like Figures 1 to 3 As shown, a ring stage 102 is formed on the long shaft section 1, and the tooth 101 is located on the ring stage 102. The ring stage 102 allows the external gear meshing with the tooth 101 to be separated from other parts of the shaft body, thereby increasing the space between the meshing gear and the entire shaft, thereby facilitating the connection between other parts and the shaft, and also facilitating the maintenance and replacement of gears, thereby reducing maintenance costs and time.

[0031] Furthermore, the tooth 101 is a helical tooth 101, which can reduce the effect of lateral force when meshing with an external gear, thereby reducing the shaft load, reducing wear and noise, and the helical tooth 101 has a better meshing angle, so the transmission efficiency is higher, and at the same time, it can make the operation of the configured robot more stable, thereby improving the stability and safety of the robot.

[0032] like Figures 1 to 3 As shown, the long shaft section 1 has a rotor assembly position 103 located between the worm section 3 and the ring stage 102. When the rotor is installed on the rotor assembly position 103, the rotor can be fixed and supported to ensure that the rotor is correctly installed on the shaft body.

[0033] like Figures 1 to 3 As shown, a keyway 104 is provided on the long shaft section 1 of the ring stage 102 which is away from the worm section 3 .

[0034] like Figures 1 to 4 As shown, a straight anti-skid groove 105 axially parallel to the key groove 104 is formed on the long shaft section 1, thereby enhancing the friction of the entire shaft body and improving the stability of the connection.

[0035] like Figures 1 to 4 As shown, the free end of the long shaft section 1 is formed with a flat shaft position 106 for the flat spanner to rotate. The flat shaft position 106 facilitates the connection between the transmission shaft of the utility model and the flat spanner. During installation and disassembly, the shaft body is twisted by the flat spanner to achieve rapid disassembly and assembly, and the rotation operation can be performed in a small space, thereby improving the efficiency and convenience of disassembly and assembly.

[0036] like Figures 1 to 3 as well as Figure 5 As shown, a bearing assembly position 201 close to the worm segment 3 is formed on the short shaft segment 2. When the bearing is installed on the bearing assembly position 201, the bearing can be fixed and supported to ensure that the bearing is correctly installed on the shaft body.

[0037] like Figures 1 to 3 as well as Figure 5 As shown, the free end of the short shaft section 2 is formed with a thread groove 202 for cooperating with a nut. The thread groove 202 is used to connect with other parts of the robot arm, and the self-locking property of the threaded connection is used to achieve a stable connection. At the same time, it has the characteristic of convenient disassembly and assembly.

[0038] Furthermore, the length ratio of the short shaft segment 2, the worm segment 3 and the long shaft segment 1 is 5:9:15.

[0039] Combination Figures 1 to 5 The transmission of the utility model is connected with the worm gear through the worm section 3 of the shaft body, and the teeth 101 on the ring platform 102 of the long shaft section 1 are meshed with the external gear. The rotor is connected by the rotor assembly position 103, and the bearing is connected by the bearing assembly position 201 of the short shaft section 2. The thread groove 202 is threadedly connected with other parts of the configured mechanical arm. When disassembling and assembling, the flat shaft section on the long shaft section 1 is rotated by a flat wrench to achieve quick installation.

[0040] The above embodiments and descriptions are only for explaining the principle and the best embodiment of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A self-locking gear transmission shaft, comprising a shaft body, characterized in that: The shaft body comprises a long shaft section (1), a short shaft section (2) and a worm section (3) for connecting with a worm gear transmission; the worm section (3) is located between the long shaft section (1) and the short shaft section (2); teeth (101) for meshing with a gear are provided on the long shaft section (1) or the short shaft section (2); a ring platform (102) is formed on the long shaft section (1); the teeth (101) are located on the ring platform (102); the teeth (101) are helical teeth (101); the long shaft section (1) has a rotor assembly position (103) located between the worm section (3) and the ring platform (102); a keyway (104) is provided on the long shaft section (1) on the side of the ring platform (102) away from the worm section (3); and a straight anti-slip groove (105) axially parallel to the keyway (104) is formed on the long shaft section (1).

2. A self-locking gear transmission shaft according to claim 1, characterized in that: The free end of the long shaft section (1) is formed with a flat shaft position (106) for a flat spanner to rotate.

3. The self-locking gear transmission shaft according to claim 1, characterized in that: The short shaft section (2) is formed with a bearing assembly position (201) close to the worm section (3).

4. A self-locking gear transmission shaft according to claim 3, characterized in that: The free end of the short shaft section (2) is formed with a thread groove (202) for cooperating with a nut.

5. The self-locking gear transmission shaft according to claim 1, characterized in that: The length ratio of the short shaft section (2), the worm section (3) and the long shaft section (1) is 5:9:15.

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