High-strength inner limiting structure for harmonic reducer

Abstract

The utility model provides a high-strength inner limiting structure for a harmonic reducer. The high-strength inner limiting structure comprises an end cover, a bearing, an output shaft, a limiting block and a fastening screw. The bearing is arranged in the end cover after being pressed on the output shaft; the limiting block is arranged in the end cover by using a fastening screw; the limiting block and the output shaft form a high-strength inner limiting structure of the harmonic reducer. The high-strength inner limiting mechanism composed of the detachable multilateral positioning limiting blocks is adopted, the precise mechanical output range and the high mechanical limiting strength of the harmonic reducer are achieved, the design requirement for the small size of the harmonic reducer is met, meanwhile, the assembling efficiency of the reducer is improved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical engineering transmission device technical field, concretely relates to a high strength internal limiting structure for harmonic reducer. BACKGROUND

[0002] As an important component in the transmission mechanism of the guided servo system, the harmonic reducer is required to be small in size and high in mechanical limiting strength in some special fields where the flight attitude needs to be adjusted.

[0003] In the prior art, the mechanical limiting mechanism of the harmonic reducer usually adopts single or single-side positioning limiting block and limiting pin to mechanically limit. In a small-size harmonic reducer, if the above mechanism is used for limiting, the shear force borne by the mechanism is large and the mechanism is prone to failure under the impact of a large output shaft torque. Therefore, for the small-size reducer that requires high mechanical limiting strength, the above limiting mechanism has obvious defects. To solve the problem, the following improved technical scheme is provided. SUMMARY

[0004] The utility model solves the technical problem: provide a kind of high strength internal limiting structure for harmonic reducer, using the high strength internal limiting mechanism of detachable multi-edge positioning limiting block, realize the accurate mechanical output range and high mechanical limiting strength of harmonic reducer, meet the small-size design demand of harmonic reducer, improve the assembly efficiency of reducer, reduce production cost.

[0005] The utility model adopts the technical scheme: a kind of high strength internal limiting structure for harmonic reducer, including end cover, bearing, output shaft, limiting block, fastening screw;The bearing is pressed into the output shaft and then is loaded in end cover;The limiting block is loaded into the end cover using fastening screw;The limiting block and the output shaft form the high strength internal limiting structure of harmonic reducer.

[0006] In the above technical scheme, as the preferred technical scheme of the utility model: the limiting block is composed of semicylindrical mounting portion and circular arc limiting block body;The mounting portion has positioning surface I;The limiting block body has positioning surface II;Positioning surface I and the positioning groove made in end cover are interference fitted, when the limiting block is impacted by output shaft torque, the positioning groove is used to limit the rotation of the limiting block;Positioning surface II and end cover are small-gap fitted;The mounting portion is provided with a counterbore, and the counterbore is concentrically arranged with the end cover thread hole.

[0007] In the above technical scheme, as the preferred technical scheme of the utility model: the limiting block is composed of semicylindrical mounting portion and circular arc limiting block body;The mounting portion and the limiting block body are connected as a whole by R circular arc transition.

[0008] In the above technical solution, as a further improvement of the utility model: the limiting block is positioned and disassembled or fastened on the end cover by a fastening screw.

[0009] In the above technical solution, as a preferred technical solution of the utility model: the fastening screw is a countersunk screw, and the thread of the countersunk screw is coated with thread glue for reinforcement.

[0010] In the above technical solution, as a further improvement of the utility model: the shaft body ring plate concentric with the output shaft is provided with a circular-arc-shaped limiting gap, the limiting gap is adapted to the limiting block, and the limiting gap is used to accurately realize mechanical limiting of the output shaft when the output shaft rotates.

[0011] In the above technical solution, as a preferred technical solution of the utility model: two limiting gaps are provided, and the two limiting gaps are arranged in an upper-lower shaft symmetrical mode; the limiting angle H° of the limiting gap is accurately designed according to the mechanical output range angle X° of the output shaft, and the centers of the two limiting gaps intersect with the center of the output shaft at the shaft center of the output shaft.

[0012] In the above technical solution, as a preferred technical solution of the utility model: the limiting block has two; the two limiting blocks are arranged in a central symmetrical mode with the shaft center of the output shaft as a symmetrical center.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The utility model adopts internal limiting, and compared with external limiting, the reliability is better under the impact of a large torque of the output shaft; meanwhile, the utility model can effectively prevent excess substances from entering the inside of the speed reducer during performance testing.

[0015] 2. The two positioning surfaces of the limiting block can effectively enhance the shear resistance of the limiting block through the positioning constraint of the inner hole and the straight edge of the end cover and the transition design of the R-arc curved surface of the limiting block.

[0016] 3. The limiting gap provided in the output shaft limiting part has a large impact-resistant bearing part, and the shear resistance of the limiting gap can be effectively enhanced.

[0017] 4. The utility model adopts two mechanical limiting structures, and compared with one mechanical limiting structure, the two mechanical limiting structures can better withstand the torque impact of the output shaft and improve the mechanical limiting strength of the speed reducer.

[0018] 5. The limiting block of the utility model can be disassembled at any time through the fastening screw, the assembly operation is simple, the assembly efficiency of the speed reducer can be improved, and the production cost is reduced.

[0019] 6、The utility model discloses utilize the existing parts of harmonic reducer as much as possible, such as end cover, output shaft to design the limiting structure, compared with the single additional limiting structure, the limiting structure is more space-saving, and more meet the small size design demand of harmonic reducer.

[0020] 7、The utility model discloses have higher shear ability, can effectively enhance the mechanical limiting strength of speed reducer, and the limiting block is simple to assemble and disassemble, can improve the assembly efficiency of speed reducer, and reduce the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the front view of the utility model;

[0022] Figure 2 It is the utility model Figure 1 The enlarged detail perspective view of limiting block in the utility model;

[0023] Figure 3 It is the utility model Figure 2 The sectional view of limiting block in the utility model;

[0024] Figure 4 It is the utility model Figure 2 The front view of limiting block in the utility model;

[0025] Figure 5 It is the utility model Figure 1 The perspective view of output shaft in the utility model;

[0026] Figure 6 It is the utility model Figure 1 The front view of output shaft in the utility model;

[0027] In the drawing: 1-end cover, 101-positioning groove, 2-bearing, 3-output shaft, 301-limiting gap, 4-limiting block, 4-1 mounting portion, 4-2 limiting block body, 401-positioning surface I, 402-positioning surface II, 403-R circular arc, 404-counterbore, 5-fastening screw. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Figures 1-6 It is obvious that the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] (As Figure 1The utility model provides a high -strength internal limiting structure for a harmonic reducer, including end cover 1, bearing 2, output shaft 3, limiting block 4, fastening screw 5. Wherein, end cover 1, bearing 2, output shaft 3 are the components that harmonic reducer has itself, limiting block 4, fastening screw 5 are new components. The utility model mainly utilizes the existing parts of harmonic reducer, such as end cover 1, output shaft 3 to design limiting structure, compared with separately adding limiting structure, the limiting structure is more space -saving, and more satisfy the small volume design demand of harmonic reducer. In addition, bearing 2 is pressed and is installed in output shaft 3 and is installed in end cover 1, limiting block 4 is used fastening screw 5 and is installed in end cover 1, especially: limiting block 4 and output shaft 3 constitute the high -strength internal limiting structure of harmonic reducer. Technical effect lies in: using internal limiting, compared with external limiting, the reliability is better under the big torque impact of output shaft 3, and simultaneously can effectively avoid the excess of performance test and enter the inside of reducer.

[0030] Moreover, it needs to be supplemented that: the combination of limiting block 4 and output shaft 3 constitutes a high-strength internal limiting structure, which can effectively resist external load and vibration, ensuring the stable operation of the harmonic reducer under high-speed and high-load conditions. The use of fastening screw 5 further enhances the connection strength between limiting block 4 and end cover 1, preventing transmission failure due to loosening. The precise fit of limiting block 4 and output shaft 3 ensures high-precision positioning during transmission, reducing transmission error. The harmonic reducer itself has the characteristics of high efficiency, and the design of this high-strength internal limiting structure further improves the transmission efficiency. This high-strength internal limiting structure is suitable for various types and specifications of harmonic reducers.

[0031] In the above embodiment, as a preferred embodiment of the present invention: the limit block 4 is composed of a semi-cylindrical mounting portion 4-1 and an arc-shaped limit block body 4-2. The semi-cylindrical mounting portion 4-1 can be easily embedded in the end cover 1 without the need for a complicated positioning and calibration process. By tightening the screws 5, the semi-cylindrical mounting portion 4-1 can form a firm connection with the end cover 1. This stable connection ensures the reliability of the limit block 4 during the operation of the harmonic reducer and prevents transmission failure due to loosening. The arc-shaped limit block body 4-2 can form a precise fit with the output shaft 3. This fit ensures high-precision positioning during the transmission process, reduces transmission errors, and improves the transmission accuracy and efficiency of the harmonic reducer. The design of this limit block 4 can adapt to harmonic reducers of different specifications and types, and can also be compatible with existing harmonic reducer structures without the need for large-scale modification or upgrading of the equipment. In addition, this compatibility helps to reduce the upgrade cost and time of the equipment and improve the flexibility and scalability of the equipment. The design of the semi-cylindrical mounting portion 4-1 and the arc-shaped stopper body 4-2 allows the stopper 4 to be manufactured through simple machining or casting processes, reducing manufacturing costs and time. When maintenance or replacement of the stopper 4 is required, it can be easily removed by simply loosening the fastening screws 5. This easy maintenance feature helps reduce maintenance costs and time, and improves the reliability and service life of the equipment.

[0032] Among them, (such as Figure 2 、 Figure 4 (as shown) the mounting portion 4-1 has a positioning surface I 401; the limiting block body 4-2 has a positioning surface II 402. The positioning surface I 401 is interference-fitted with the positioning groove 101 provided on the end cover 1. When the limiting block 4 is subjected to torque impact from the output shaft 3, the positioning groove 101 is used to limit the rotation of the limiting block 4. The positioning surface II 402 is fitted with a small gap with the end cover 1. This design is mainly designed considering the positioning processing errors of the limiting block 4 and the threaded hole of the end cover 1. The mounting portion 4-1 is provided with a countersunk hole 404, which is concentrically arranged with the threaded hole of the end cover 1 to ensure accuracy while realizing the sinking installation of the fastening screw 5. Among the above embodiments, as a preferred embodiment of the present utility model: (as shown Figure 2 、 Figure 3 (As shown in the figure), the mounting portion 4-1 and the stopper body 4-2 are connected as one piece by an R-arc 403 transition. In summary, the two positioning surfaces of the stopper 4 of the present invention, namely positioning surface I 401 and positioning surface II 402, are constrained by multiple locations with the inner hole and straight edge of the end cap 1, and the R-arc 403 curved transition design of the stopper 4 effectively enhances the shear resistance of the stopper.

[0033] In the above embodiment, as a further improved embodiment of the present invention: (such as Figure 1The limiting block 4 is positioned, disassembled or fastened on the end cover 1 by a fastening screw 5, which first realizes the detachable function of the limiting block 4. The fastening screw 5 can accurately fix the limiting block 4 at a predetermined position on the end cover 1. Through the connection of the fastening screw 5, the limiting block 4 can be conveniently disassembled and replaced. When the limiting block 4 is worn or damaged, it can be removed by loosening the fastening screw 5, and then a new limiting block 4 is replaced, which improves the maintenance efficiency and flexibility.

[0034] In the above embodiment, as a preferred embodiment of the utility model: (in combination Figure 3 ) The fastening screw 5 is a countersunk screw, and the thread of the countersunk screw is coated with thread glue for reinforcement. It should be noted that the head of the countersunk screw is the same diameter as the screw rod or slightly smaller, which can be sunk into the mounting hole, i.e. the counterbore 404, so that the mounting surface of the limiting block 4 remains flat and does not protrude or recess. The design of the head of the countersunk screw helps to increase the contact area between the screw and the mounting hole, improve the firmness and stability of the connection, and is suitable for occasions where the mounting surface needs to be kept flat. Thread glue can fill the small gaps in the thread joint part and solidify after being applied, forming a soft sealing layer. This sealing layer effectively prevents the penetration of liquids, gases or impurities, improving the sealing performance of the threaded connection, thereby avoiding leakage and loosening. The soft sealing layer formed after the solidification of the thread glue can absorb and disperse vibration energy, reducing the loosening and fatigue fracture of the threaded connection under vibration and impact, improving the reliability and stability of the connection. The use of thread glue can simplify the assembly process without the need for additional sealing elements or gaskets. At the same time, the thread glue solidifies quickly, allowing assembly to be completed in a short time, improving production efficiency. In addition, thread glue generally has good corrosion resistance, which can resist the corrosion of acidic, alkaline and salty environments, prolonging the service life of the harmonic reducer.

[0035] In the above embodiment, as a further improved embodiment of the utility model: (as Figure 5 The limiting gap 301 of the circular arc shape is made on the shaft body ring plate concentric with the output shaft 3, and the limiting gap 301 is matched with the limiting block 4 (as Figure 1The limiting gap 301 is used for the output shaft 3 to accurately realize mechanical limiting of the output shaft during rotation. The limiting gap 301 and the limiting block 4 are designed to match, so that the output shaft 3 can accurately stop at a predetermined position during rotation. This accurate positioning capability helps to ensure that the moving parts of the machine or equipment move according to the predetermined stroke and angle, avoiding mispositioning or overtravel of the moving parts. The cooperation of the limiting gap 301 and the limiting block 4 can form a certain constraint to prevent the output shaft 3 from loosening due to vibration or impact during rotation. This stability enhancement helps to ensure operation stability and prolong the service life of the harmonic reducer. Through the limiting action of the limiting gap 301 and the limiting block 4, the axial and radial displacement of the output shaft 3 can be limited, thereby improving the carrying capacity of the output shaft 3. The limiting gap 301 and the limiting block 4 can simplify the structural design of the output shaft 3 and its related parts. The cooperation of the limiting gap 301 and the limiting block 4 makes the assembly and debugging process of the output shaft 3 more simple and convenient. During assembly, the limiting block 4 only needs to be aligned with the limiting gap 301 and fixed, without the need for complex adjustment and calibration. In particular: the limiting gap 301 made on the output shaft 3 limiting part has a larger anti-impact bearing part, which can effectively enhance the shear resistance of the limiting gap 301.

[0036] In the above embodiment, as a preferred embodiment of the utility model: (as shown in Figure 1 、 Figure 6 The limiting gap 301 is provided with two limiting gaps 301, which are arranged symmetrically on the output shaft 3. The limiting angle H° of the limiting gap 301 is accurately designed according to the mechanical output range angle X° of the output shaft 3, and the centers of the two limiting gaps 301 intersect with the center of the output shaft 3 on the axis of the output shaft 3. In the above embodiment, as a preferred embodiment of the utility model: (as shown in Figure 1 The limiting block 4 has two limiting blocks 4, which are arranged symmetrically with the axis of the output shaft 3 as the center of symmetry. The utility model adopts two mechanical limiting structures, which can better withstand the impact of the output shaft torque and improve the mechanical limiting strength of the reducer compared with one mechanical limiting structure.

[0037] Furthermore, the two upper and lower axis-symmetrically arranged limiting notches 301 can ensure that the output shaft 3 accurately stays at a predetermined position during rotation, and the high-precision positioning capability helps to achieve precise control of the machine or device and avoid mispositioning or overtravel of the moving parts. The limiting angle H° of the limiting notch 301 is accurately designed according to the mechanical output range angle X° of the output shaft 3, which means that the rotation range of the output shaft 3 is strictly limited within a predetermined angle. Such range control helps to ensure running stability and prevent damage or failure caused by excessive rotation of the output shaft 3. The upper and lower axis-symmetrically arranged limiting notches 301 can form a more stable limiting structure and help to prevent the output shaft 3 from loosening due to vibration or impact during rotation. Through accurate design of the limiting angle H° and the shape of the limiting notch 301, the close fit between the limiting block 4 and the limiting notch 301 can be ensured, thereby improving the reliability of the entire limiting structure. Such enhanced reliability helps to reduce the failure rate and improve production efficiency. The upper and lower axis-symmetrically arranged limiting notches 301 and the accurately designed limiting angle H° help to simplify the structural design of the output shaft and its related components, and such optimized design can reduce manufacturing costs and improve production efficiency. Since the fitting mode of the limiting notch 301 and the limiting block 4 is simple and clear, the limiting block 4 only needs to be aligned with the limiting notch 301 and fixed during assembly, and such assembly mode does not require complex adjustment and calibration, which helps to improve assembly efficiency.

[0038] The design principle of the utility model is: the positioning surface I 401 of the limiting block 4 and the positioning groove 101 of the end cover 1 are interference fit, avoiding the rotation of the limiting block 4 when it is impacted by the torque of the output shaft 3; considering the positioning machining error of the limiting block 4 and the end cover 1, the positioning surface II 402 of the limiting block 4 and the end cover 1 are small gap fit; at the same time, in order to avoid the stress concentration of the curved surface transition, R arc 403 is used for transition at the curved surface transition of the limiting block 4, the structure strength is stable and reliable, through the above structure design, the shear resistance of the limiting block is effectively improved. The limiting notch 301 is opened on the output shaft 3, which can accurately realize the mechanical limiting function of the output shaft 3 during rotation; at the same time, the larger limiting bearing part makes the shear resistance of the limiting notch 301 of the output shaft 3 better. In order to ensure the limiting precision, the limiting block 4 is positioned, fastened and smeared with thread glue by the sinking type design fastening screw 5. Compared with the single limiting block 4 or limiting pin design, two limiting blocks 4 can bear greater output shaft torque impact and improve the mechanical limiting strength of the reducer. The detachable limiting block 4 can improve the assembly efficiency of the reducer and reduce the cost. For example, when the performance of the reducer is tested, the limiting block 4 can not be assembled; after the performance test is completed, the limiting block 4 is reassembled. Compared with the limiting structure of the similar limiting block on the output shaft 3 and the limiting groove in the end cover 1, the detachable limiting block 4 of the utility model does not need to make a complex process end cover 1, the cost is lower, and the performance test is more convenient.

[0039] Therefore, the utility model discloses can effectively improve the mechanical limiting strength of speed reducer through the limiting block 4 and the limiting structure part design such as the limiting gap 301 of output shaft 3, can improve the assembly efficiency of speed reducer simultaneously, and effectively reduce production cost.

[0040] Each embodiment in the specification is described in a related manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0041] The above only is the preferred embodiment of the utility model, and is not used for limiting the protection scope of the utility model. Any modification and equivalent replacement etc. that are made in the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A high-strength inner limiting structure for a harmonic reducer, characterized by: Including end cover (1), bearing (2), output shaft (3), limit block (4), fastening screw (5); The bearing (2) is pressed into the output shaft (3) and then loaded in the end cover (1); The limit block (4) is loaded into the end cover (1) using the fastening screw (5); The limit block (4) and the output shaft (3) form a high-strength internal limiting structure of a harmonic reducer; The limit block (4) is composed of a semicylindrical mounting portion (4-1) and an arc-shaped limit block body (4-2).

2. The high-strength inner limiting structure for a harmonic reducer according to claim 1, characterized in that: The mounting portion (4-1) has a positioning surface I (401); The limit block body (4-2) has a positioning surface II (402); The positioning surface I (401) is interference-fitted with a positioning groove (101) made in the end cover (1), and the positioning groove (101) is used to limit the rotation of the limit block (4) when the limit block (4) is impacted by the torque of the output shaft (3); The positioning surface II (402) is clearance-fitted with the end cover (1); The mounting portion (4-1) is provided with a counterbore (404), and the counterbore (404) is concentrically arranged with a wire hole of the end cover (1).

3. The high-strength inner limiting structure for a harmonic reducer according to claim 1, characterized in that: The mounting portion (4-1) and the limit block body (4-2) are integrally connected by an R-arc (403).

4. The high-strength inner limiting structure for a harmonic reducer according to claim 1 or 2 or 3, characterized in that: The limit block (4) is positioned, disassembled or fastened on the end cover (1) by the fastening screw (5).

5. The high-strength inner limiting structure for a harmonic reducer according to claim 4, characterized in that: The fastening screw (5) is a countersunk screw, and the threads of the countersunk screw are coated with thread glue for reinforcement.

6. The high-strength inner limiting structure for a harmonic reducer according to claim 1, characterized in that: The output shaft (3) is provided with arc-shaped limit notches (301) on the concentric shaft body ring plate, the limit notches (301) are adapted to the limit block (4), and the limit notches (301) are used to accurately realize the mechanical limiting of the output shaft when the output shaft (3) rotates.

7. The high-strength inner limiting structure for a harmonic reducer according to claim 6, characterized in that: The limit notches (301) are provided with two, and the two limit notches (301) are arranged in axial symmetry; The limiting angle H° of the limit notches (301) is accurately designed according to the mechanical output range angle X° of the output shaft (3), and the centers of the two limit notches (301) intersect with the center of the output shaft (3) at the axis of the output shaft (3).

8. The high-strength inner limiting structure for a harmonic reducer according to claim 1 or 2 or 3 or 6, characterized in that: The limit block (4) has two; The two limit blocks (4) are arranged in central symmetry with the axis of the output shaft (3) as the center of symmetry.

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