Planet carrier structure and welding method

Abstract

The present invention discloses a planetary frame structure and a welding method for a gearbox with a small size, large bearing capacity and greatly improved transmission efficiency, which solves the technical problems in the prior art that the gearbox can only use castings, has a large size, low transmission efficiency and a certain limitation in the scope of use. The structure comprises a partition, which is clamped between a left rotating frame and a right rotating frame, and the two ends of the partition are respectively inserted into the corresponding left rotating frame and the right rotating frame; a planetary gear accommodating cavity, and adjacent partitions enclose the planetary gear accommodating cavity.

Description

Technical Field

[0001] The present invention relates to a planetary frame structure and a welding method, and in particular to a planetary frame structure and a welding method with a small gear box volume, large bearing capacity and greatly improved transmission efficiency. Background Art

[0002] Most of the gears known to the public are gears with fixed rotation axes, i.e. "fixed axis gears", while the rotation axes of "planetary gears" are not fixed, but are installed on a rotatable bracket. In addition to the rotation of the axis gears around their own rotation axes, their rotation axes also rotate around the axes of other gears along with the bracket (i.e. planetary carrier). The rotation around their own axes is called "autorotation", and the rotation around the axes of other gears is called "revolution", just like the planets in the solar system, hence the name "planetary gears". Existing rotating racks generally use castings, which leads to a large gearbox, low space utilization, and low transmission efficiency. When the transmission efficiency needs to be improved, the number of planetary gears has to be increased, resulting in a further increase in the size of the gearbox, which not only leads to an increase in material and transportation costs, but also has certain limitations on its scope of use due to the large size of the gearbox. Summary of the invention

[0003] The present invention mainly provides a planetary frame structure and a welding method for a gearbox with a small size, large load-bearing capacity and greatly improved transmission efficiency, thereby solving the technical problems in the prior art that gearboxes can only use castings, are bulky, have low transmission efficiency and have certain limitations in the scope of use.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: a planetary frame structure, including a partition, the partition is clamped between the left rotating frame and the right rotating frame, and the two ends of the partition are respectively inserted into the corresponding left rotating frame and the right rotating frame; a planetary gear accommodating cavity, and the adjacent partitions are enclosed to form a planetary gear accommodating cavity. The planetary gear accommodating cavity is formed by welding a plurality of partitions between the left and right rotating frames, that is, the rotating frame is formed by welding. Compared with traditional castings, it is small in size and light in weight, and the spatial structure can be more compact. On the premise that the bearing capacity meets the use requirements, the material and transportation costs are greatly reduced. In order to improve the torque and transmission efficiency, when the number of planetary gears is increased, the volume of the original gearbox is basically not affected, such as realizing six-wheel planetary gears, seven-wheel planetary gears, and even higher numbers of planetary gears, so as to break through the traditional production of only five-wheel planetary gears at most, and realize the low-cost and small-volume production of large-torque planetary gearboxes.

[0005] Preferably, the partition includes a fan-shaped lower partition, and the short arc end of the lower partition is connected to a rectangular upper partition. The partition divides a plurality of planetary gear accommodating cavities between the left and right rotating frames, wherein the fan-shaped lower partition increases the connection area between the left and right rotating frames, thereby improving the strength of the rotating frames.

[0006] As a more preferred embodiment, the butt joint surface of the upper baffle and the lower baffle is close to the center plane of the annular surface of the left rotating frame and the right rotating frame. The center plane of the circumferential direction of the left and right rotating frames corresponds to the center position of the planetary gear, and the spatial structure of the rotating frame is optimized while ensuring the strength of the rotating frame, making its structure more compact.

[0007] Preferably, the two ends of the partition adjacent to the left rotating frame and the right rotating frame are provided with positioning columns, and the left rotating frame and the right rotating frame corresponding to the positioning columns are provided with positioning holes, and the positioning columns are inserted into the positioning holes and fixed by welding rings. The positioning columns at both ends of the partition are inserted into the positioning holes of the left and right rotating frames and then fixed by ring welding, which has high connection strength, strong deformation resistance, and greatly improved bearing capacity, impact resistance and vibration resistance.

[0008] As a more preferred embodiment, the left rotating frame and the right rotating frame are mutually connected on the corresponding annular steps at both ends of the partition, and the welding ring is arranged in the positioning hole. The annular step can ensure the relative size of the left and right rotating frames and improve the dimensional accuracy of the rotating frames; the welding ring is located in the positioning hole, which mainly increases the area of ​​the welding surface and improves the connection strength of the rotating frame.

[0009] Preferably, the partition is fixed on the inner side of the corresponding left rotating frame and right rotating frame by ring welding to ensure the connection strength.

[0010] A welding method for a planetary carrier structure,

[0011] The steps include:

[0012] 1) Bulkhead welding and forming;

[0013] 2) Mark two spot welding marks on the corresponding positioning hole ports on the outer sides of the left rotating frame and the right rotating frame respectively, and the connecting line of the two spot welding marks passes through the center axis of the left rotating frame or the right rotating frame;

[0014] 3) Lay the inner side of the left rotating frame upward on the welding platform, take the partition, and insert the positioning columns at the lower end of the partition downward into the positioning holes respectively;

[0015] 4) Take the right rotating frame and insert the positioning holes on the right rotating frame into the positioning columns on the upper end of the middle partition in step 3);

[0016] 5) Spot weld the right rotating frame and the positioning column in sequence. During the process, first spot weld the welding points corresponding to the outer spot welding marks in the counterclockwise direction, and then spot weld the welding points corresponding to the inner spot welding marks in the clockwise direction. The spot welding points are located at the inner end of the positioning hole, and the welding starting points of the spot welding in the clockwise direction and the counterclockwise direction are consistent;

[0017] 6) Continuously weld the welds between two spot welding points in the same positioning hole. During the process, first weld the semi-circular arc weld on the right side counterclockwise, and then weld the semi-circular arc weld on the left side clockwise;

[0018] 7) Repeat step 6) to perform soldering until the solder fills the positioning hole;

[0019] 8) Turn 180 degrees, so that the right rotating frame is flat on the welding platform and the left rotating frame is facing upwards, and then perform steps 5) to 7) in sequence;

[0020] 9) The end face of the partition is circumferentially welded to the inner side of the right rotating frame;

[0021] 10) Turn 180 degrees, and the end face of the partition is welded on the inner side of the left rotating frame;

[0022] Step 1) and step 2) can be interchanged, and step 3) to step 10) are performed sequentially after step 1) and step 2).

[0023] First, place the left rotating frame (or right rotating frame) flat on the welding platform, then insert the positioning columns on the partition into the corresponding positioning holes on the left rotating frame (or right rotating frame), and then insert the right rotating frame (or left rotating frame) into the positioning columns at the outer end of the partition, and then spot weld along the radially arranged spot welding marks, first spot weld the spot welding marks on the outer side in sequence, and then spot weld the spot welding marks on the inner side in sequence. The order of the two spot weldings is opposite, but the starting points of the spot welding are the same, that is, the spot welding deformation is automatically offset by the opposite spot welding order to ensure the dimensional accuracy of the rotating frame during the spot welding process; then complete the ring corresponding to each positioning hole in sequence The shaped weld is divided into two half-ring welds, left and right, during welding. The welding starting points are consistent and the welding direction is from outside to inside. The entire weld ring is completed by superimposing multiple weld rings, so that the welding stress is first concentrated on the outside of the rotating frame. When the weld moves inward, the stress offsets the deformation on the left and right and outside, so that the size of the finished product remains basically unchanged. At the same time, the multi-layer weld ring has good weld penetration, which improves the connection strength between the positioning column and the positioning hole. After the welding of one side of the rotating frame is completed, it is turned 180 degrees to complete the welding of the other side of the rotating frame, which also ensures the connection strength and dimensional accuracy of the other side of the rotating frame.

[0024] Preferably, the welding starting points in step 6) are the same, and the welding is completed in a clockwise or counterclockwise direction, ensuring that the welding rings corresponding to the positioning columns are subjected to balanced forces to avoid deformation of the rotating frame.

[0025] Preferably, when performing step 5), the welding direction of step 8) is the same as that of step 5). The welding directions of the left and right rotating frames make the stress states of the left and right rotating frames symmetrical, thereby automatically balancing the stress state of the rotating frames and extending the service life of the rotating frames.

[0026] Therefore, the planetary carrier structure and welding method of the present invention have the following advantages: the fan-shaped lower partition reasonably divides the planetary gear accommodating cavity area and increases the connection area of ​​the left and right rotating frames, thereby ensuring the overall strength of the rotating frame; the positioning column adopts insert welding, which has high connection strength and large bearing capacity, greatly reduces the size of the gear box, and meets the use requirements of small spaces; welding is carried out according to the set welding sequence, which can automatically offset the welding stress, reduce welding deformation and improve welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a planet carrier structure of the present invention;

[0028] Figure 2 yes Figure 1 AA section view shown;

[0029] Figure 3 yes Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0031] Example:

[0032] like Figure 1 and Figure 2 As shown, taking a six-wheel planet as an example, a planetary frame structure of the present invention includes an annular left rotating frame 1 and a right rotating frame 2, the left rotating frame 1 and the right rotating frame 2 are coaxially arranged, and six partitions 3 are clamped and fixed between the left rotating frame 1 and the right rotating frame 2, and the six partitions 3 are evenly distributed along the circumferential direction of the left rotating frame 1 and the right rotating frame 2, and six planetary gear accommodating chambers 4 are enclosed between adjacent partitions 3 in the circumferential direction, wherein the partitions 3 include a fan-shaped lower partition 31 and a rectangular upper partition 32, the upper partition 32 is welded to the short arc end of the lower partition 31, and the long arc end of the lower partition 31 is close to the edge of the left rotating frame 1 and the right rotating frame 2 and remains parallel, and the other end of the upper partition 32 opposite to the lower partition 31 is close to the center hole of the left rotating frame 1 and the right rotating frame 2, and the butt surface of the upper partition 32 and the lower partition 31 is close to the center dividing surface of the circumferential direction of the annular surface of the left rotating frame 1 and the right rotating frame 2, as shown in FIG. Figure 3As shown, the middle part of the fan-shaped surface of the lower partition 31 extends outward to form a positioning column 5, and positioning holes 6 are opened on the left rotating frame 1 and the right rotating frame 2 corresponding to the positioning column 5. The positioning columns 5 on both sides of the lower partition 31 are respectively inserted into the corresponding positioning holes 6 on the left rotating frame 1 and the right rotating frame 2. An annular step 8 is formed on the surface of the lower partition 31 corresponding to the inner end of the positioning column 5. When the positioning column 5 is inserted into the positioning hole 6, the inner port of the positioning hole 6 is respectively engaged with the corresponding annular step 8, and the positioning column 5 is then fixed to the inner ring surface of the positioning hole 6 by ring welding. After the ring welding, a welding ring 7 is formed, and the welding ring 7 is located in the positioning hole 6. The edges of the fan-shaped surface of the partition 3 are fixed to the corresponding inner side surfaces of the left rotating frame 1 and the right rotating frame 2 by ring welding.

[0033] A welding method for a planetary carrier structure comprises the following steps:

[0034] 1) The short arc ends of the upper partition 32 and the lower partition 31 are butted and fixed by ring welding;

[0035] 2) Use a marker pen to mark two spot welding marks on the corresponding positioning hole 6 ports on the outer side of the left rotating frame 1 and the right rotating frame 2, and the connecting line of the two spot welding marks passes through the central axis of the left rotating frame 1 or the right rotating frame 2;

[0036] 3) Lay the left rotating frame 1 on the welding platform with the inner side facing upwards, take the partition 3, and insert the positioning posts 4 at the lower end of the partition 3 downwards into the positioning holes 6 on the left rotating frame 1 respectively;

[0037] 4) Take the right rotating frame 2, and insert the positioning holes 6 on the right rotating frame 2 into the positioning columns 4 at the upper end of the partition plate 3 in step 3);

[0038] 5) Spot weld and fix the right rotating frame 2 and the positioning column 4 in sequence. In the process, first spot weld the welding points corresponding to the outer spot welding marks in the counterclockwise direction, and then spot weld the welding points corresponding to the inner spot welding marks in the clockwise direction. The spot welding points are located at the inner end of the positioning hole 6, and the welding starting points of the spot welding in the clockwise direction and the counterclockwise direction are consistent;

[0039] 6) Continuously weld the welds between two spot welding points in the same positioning hole 6. The welding starting point is the same during the process. First, weld the semi-circular arc weld on the right side in a counterclockwise direction, then weld the semi-circular arc weld on the left side in a clockwise direction, and complete the welding in a clockwise or counterclockwise direction in turn;

[0040] 7) Repeat step 6) to perform soldering until the solder fills the positioning hole 6;

[0041] 8) Turn 180 degrees, so that the right rotating frame 2 is flat on the welding platform and the left rotating frame 1 is facing upwards, and then perform steps 5) to 7) in sequence. During the process of performing step 5), the welding direction is opposite to that of step 5);

[0042] 9) The end surface of the lower partition plate 31 corresponding to the inner end of the positioning column 4 is circumferentially welded on the inner side surface of the right rotating frame 2;

[0043] 10) Flip 180 degrees, and the end surface of the lower partition 31 corresponding to the inner end of the positioning column 4 is circumferentially welded on the inner side surface of the left rotating frame 1;

[0044] Step 1) and step 2) can be interchanged, and step 3) to step 10) are performed sequentially after step 1) and step 2).

[0045] The specific embodiments described herein are merely examples of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A planet carrier structure, characterized in that: include: A partition (3), the partition (3) is clamped between the left rotating frame (1) and the right rotating frame (2), and the two ends of the partition (3) are respectively inserted into the corresponding left rotating frame (1) and the right rotating frame (2), the partition (3) comprises a fan-shaped lower partition (31) and a rectangular upper partition (32), and the short arc end of the lower partition (31) is connected to the rectangular upper partition (32); A planetary gear accommodating chamber (4), wherein adjacent partitions (3) enclose the planetary gear accommodating chamber (4); The two ends of the partition (3) adjacent to the left rotating frame (1) and the right rotating frame (2) are respectively provided with positioning columns (5), and the left rotating frame (1) and the right rotating frame (2) corresponding to the positioning columns (5) are respectively provided with positioning holes (6), and the positioning columns (5) are inserted into the positioning holes (6) and fixed by welding rings (7); The welding method of the planet carrier structure comprises the following steps: 1) The partition (3) is welded and formed; 2) Mark two spot welding marks on the corresponding positioning holes (6) on the outer side surfaces of the left rotating frame (1) and the right rotating frame (2), respectively, and the connecting line of the two spot welding marks passes through the center axis of the left rotating frame (1) or the right rotating frame (2); 3) Lay the left rotating frame (1) on the welding platform with the inner side facing upwards, take the partition (3), and insert the positioning posts (5) at the lower end of the partition (3) downwards into the positioning holes (6) respectively; 4) Take the right rotating frame (2), and insert the positioning holes (6) on the right rotating frame (2) into the positioning columns (5) at the upper end of the partition plate (3) in step 3); 5) spot welding the right rotating frame (2) and the positioning column (5) in sequence, first spot welding the welding points corresponding to the outer spot welding marks in sequence in the counterclockwise direction, and then spot welding the welding points corresponding to the inner spot welding marks in sequence in the clockwise direction, the spot welding points are located at the inner end of the positioning hole (6), and the welding starting points of the spot welding in the clockwise direction and the spot welding in the counterclockwise direction are consistent; 6) Continuously welding the welds between two spot welding points in the same positioning hole (6), first welding the semicircular arc weld on the right side in a counterclockwise direction, and then welding the semicircular arc weld on the left side in a clockwise direction; 7) Repeat step 6) to perform soldering until the solder fills the positioning hole (6); 8) Flip 180 degrees so that the right rotating frame (2) is flat on the welding platform and the left rotating frame (1) is facing upwards, and then perform steps 5) to 7) in sequence; 9) The end face of the partition plate (3) is circumferentially welded to the inner side face of the right rotating frame (2); 10) Flip 180 degrees, and the end face of the partition plate (3) is circumferentially welded to the inner side face of the left rotating frame (1); Step 1) and step 2) can be interchanged, and step 3) to step 10) are performed sequentially after step 1) and step 2).

2. The planet carrier structure according to claim 1, characterized in that: The upper partition plate (32) is welded to the short arc end of the lower partition plate (31).

3. The planet carrier structure according to claim 2, characterized in that: The butt joint surfaces of the upper baffle (32) and the lower baffle (31) are close to the center dividing surface of the annular surfaces of the left rotating frame (1) and the right rotating frame (2).

4. The planet carrier structure according to claim 1, characterized in that: The left rotating frame (1) and the right rotating frame (2) are mutually clamped on the corresponding annular steps (8) at both ends of the partition plate (3), and the welding ring (7) is arranged in the positioning hole (6).

5. The planet carrier structure according to claim 1, characterized in that: The partition plate (3) is fixed by ring welding on the inner side surfaces of the corresponding left rotating frame (1) and right rotating frame (2).

6. The welding method of the planetary carrier structure according to claim 1, characterized in that: The welding starting points in step 6) are the same, and the welding is completed in a clockwise or counterclockwise direction.

7. The welding method of the planetary carrier structure according to claim 1, characterized in that: When executing step 5), the welding direction of step 8) is opposite to that of step 5).

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