A compact travel reducer and engineering machinery with double support structure

Abstract

The present application discloses a compact travel reducer and engineering machinery with a double-support structure, wherein the travel reducer comprises an input shaft; an input planetary assembly, comprising a second sun gear, a second planetary gear and a second gear ring, wherein the second sun gear is connected to the input shaft; an intermediate transmission shaft, wherein the second planetary gear is connected to the intermediate transmission shaft; an output planetary assembly, comprising a fourth sun gear, a fourth planetary gear and a fourth gear ring, wherein the fourth sun gear is connected to the intermediate transmission shaft; an output shaft is rotatably sleeved on the outer periphery of the intermediate transmission shaft, wherein the fourth planetary gear is connected to the output shaft; an outer wall of the second gear ring is provided with a first fixed position for installing a fixed bracket, an outer wall of the fourth gear ring is provided with a second fixed position for installing between fixed brackets, and an outer wall of the output shaft is provided with an output position for installing a transmission device, wherein the output position is located between the first fixed position and the second fixed position. The present application can enhance the rigidity and stability of the reducer and the track bracket under the premise of reducing the thickness of the track frame plate.

Description

Technical Field

[0001] The present application relates to the technical field of reducers, and in particular to a compact travel reducer and engineering machinery with a double-support structure. Background Art

[0002] Planetary reducer is a precision mechanical transmission device, mainly used to reduce the speed of the input shaft and increase the torque of the output shaft. It is widely used in various industrial automation equipment, robots, machine tools, medical equipment and other fields. The working principle of the planetary reducer is to use multiple planetary gears to rotate around a central gear (sun gear) to achieve deceleration through the interaction of the planetary gear train.

[0003] In the related technology, "China Journal Full-text Database" published "A Technical Analysis of a Foreign Crawler Travel Reducer" in the September 2008 issue, written by Song Yuping. It introduces that the current general travel reducer has a single-sided flange fixed support, and a hydraulic motor or electric motor is installed on the left end of the reducer as the power input. After the power input is input to the second sun gear shaft of the reducer in the form of high speed and low torque, it is transmitted to the output gear ring of the reducer through the deceleration and torque increase of the reducer, and the power is transmitted to the output gear ring of the reducer through the gear with the help of a tapered bearing. At this time, the output gear ring rotates around its own axis to output low speed and high torque. The crawler sprocket is fixed to the output gear ring of the reducer by high-strength bolts, and the crawler track is driven forward as the gear ring rotates.

[0004] The planetary frame of the reducer is cantilevered and installed on the right side of the mounting base by bolts, and the sprocket and the output gear ring are cantilevered and installed on the right side of the mounting base by means of tapered bearings. Due to the inherent weakness of the cantilever structure, the structural form mainly transmits torque and cannot withstand radial force. At the same time, the poor force form of the tapered bearing greatly affects the service life. At the same time, the one-sided support causes the reducer mounting bracket to be biased and protrude from one side of the crawler frame. Because it protrudes from the overall crawler frame, the rigidity of the crawler frame at this position is weak. In order to ensure the rigidity requirements, the thickness and weight of the crawler frame will inevitably increase. Summary of the invention

[0005] In order to enhance the reducer itself and the overall structural rigidity while reducing the thickness of the track frame plate, the present application provides a compact travel reducer and engineering machinery with a double-support structure.

[0006] The present application provides a compact travel reducer with a double support structure, which adopts the following technical solution:

[0007] First,

[0008] A compact travel reducer with a double support structure, comprising:

[0009] Input shaft;

[0010] An input planetary assembly, comprising a second sun gear, a second planetary gear and a second ring gear, wherein an input end of the second sun gear is connected to the input shaft, and the second sun gear, the second planetary gear and the second ring gear are meshed in sequence;

[0011] an intermediate transmission shaft, the output end of the second planetary gear being connected to the intermediate transmission shaft;

[0012] an output planetary assembly, comprising a fourth sun gear, a fourth planetary gear and a fourth ring gear, wherein an input end of the fourth sun gear is connected to the intermediate transmission shaft, and the fourth sun gear, the fourth planetary gear and the fourth ring gear are meshed in sequence;

[0013] An output shaft, rotatably sleeved on the outer periphery of the intermediate transmission shaft, the output end of the fourth planetary gear being connected to the output shaft;

[0014] Among them, the outer wall of the second gear ring is provided with a first fixed position for installing a fixed bracket, the outer wall of the fourth gear ring is provided with a second fixed position for installing a fixed bracket, and the outer wall of the output shaft is provided with an output position for installing a transmission device, and the output position is located between the first fixed position and the second fixed position.

[0015] By adopting the above technical solution, the double-sided support mechanism ensures that the first fixed position and the second fixed position of the reducer of the crawler bridge are stressed to form a closed loop, and the structural strength and rigidity are more stable, which can be applied to more severe working conditions, and the thickness of the crawler frame is thinner, which is easy to design and manufacture. At the same time, the compact travel reducer with double-sided support enhances the rigidity of the reducer itself, making it more reliable in application.

[0016] Optionally, the distance between the output position and the second fixed position is smaller than the distance between the output position and the first fixed position.

[0017] By adopting the above technical solution, the fourth gear ring is the component that mainly bears torque, and the fourth gear ring is the component that secondarily bears torque. Through the above design, it is possible to ensure that the forces on the second gear ring and the fourth gear ring are balanced, thereby increasing structural stability.

[0018] Optionally, the output shaft includes a long sleeve portion and a short output portion, the long sleeve portion is rotatably sleeved on the outer periphery of the intermediate transmission shaft, the short output portion is fixed to the middle part of the outer wall of the long sleeve portion, a first support bearing is radially arranged between the second gear ring and the long sleeve portion, and a second support bearing is radially arranged between the fourth gear ring and the long sleeve portion.

[0019] By adopting the above technical solution, the high radial load of the output shaft can be transmitted to the second gear ring and the fourth gear ring through the support bearing, and then transmitted to the fixed bracket by the second gear ring and the fourth gear ring, so that the support form of the sprocket installed on the output shaft is changed from cantilever support to simply supported beam support, which greatly improves the radial load-bearing capacity of the reducer and has a wider range of applications.

[0020] Optionally, the second gear ring includes a second gear ring body and a first mounting member detachably connected to the second gear ring body, a first sealing ring and a first sealing member are provided on the first mounting member, a first labyrinth groove and a second labyrinth groove are provided on the outer wall of the short output portion, the first labyrinth groove is farther away from the long sleeve portion than the second labyrinth groove, the first sealing ring is inserted into the first labyrinth groove and is rotatably connected to the groove wall of the first labyrinth groove, and the first sealing member is inserted into the second labyrinth groove and is rotatably connected to the groove wall of the second labyrinth groove.

[0021] By adopting the above technical solution, the first mounting member improves the sealing performance between the second gear ring and the output shaft, ensures the sealing effect of the output shaft when the second gear ring rotates, and prolongs its service life. At the same time, the detachable design of the first mounting member and the second gear ring body can solve the problem of inconvenience in replacing the first mounting member after long-term operation and wear.

[0022] Optionally, the first mounting member includes a first connecting portion and a first supporting portion, the first connecting portion is detachably connected to the second gear ring body, the first supporting portion is detachably connected to a side of the first connecting portion away from the second gear ring body, the outer diameter of the first connecting portion is larger than the outer diameter of the first supporting portion, the first fixed position is arranged at the stop and the end face formed by the first connecting portion and the first supporting portion, a first mechanical seal is arranged between the first supporting portion and the short output portion, the first mechanical seal is closer to the long sleeve portion than the first seal, and the first support bearing is located between the first support portion and the long sleeve portion.

[0023] By adopting the above technical solution, the structure of the first mounting member can be designed and replaced according to the shape structure of the fixed bracket, thereby improving the applicability of the device. At the same time, when the first support bearing is worn, the first mounting member and the first support bearing can be disassembled and assembled more conveniently, thereby improving the convenience of subsequent maintenance. In addition, the design of the first mechanical seal further improves the sealing effect between the two.

[0024] Optionally, the fourth gear ring includes a fourth gear ring body and a second support portion detachably connected to the fourth gear ring body, a third labyrinth groove is provided on an outer wall of the short output portion, the output position is located on the outer side of the short output portion away from the third labyrinth groove, the second support portion is embedded in the third labyrinth groove and is rotatably connected to the inside of the third labyrinth groove, and the second support bearing is located between the second support portion and the long sleeve portion.

[0025] By adopting the above technical solution, the radial force on the fourth gear ring is greater, the contact area between the fourth gear ring and the output shaft is increased, and the high radial load can be more effectively transmitted to the fourth gear ring, thereby improving the operating stability between the two.

[0026] Optionally, the slot size of the third labyrinth slot increases from the inside of the short output portion to the outside and toward the outer diameter of the second support portion.

[0027] By adopting the above technical solution, the volume of the second support part close to the long sleeve part is increased, and the radial force is transmitted between the second support part close to the long sleeve part and the long sleeve part through the second support bearing, so that the volume of the second support part close to the long sleeve part is larger, which is more conducive to enhancing the stability of the structure during the force transmission process.

[0028] Optionally, a second seal and a second mechanical seal are provided between the second supporting portion and the short output portion, and the second mechanical seal is closer to the long sleeve portion than the second seal.

[0029] By adopting the above technical solution, the water vapor can be reduced from entering the reducer through the rotating gap, thereby extending the service life of the reducer.

[0030] Second,

[0031] An engineering machine comprises the above-mentioned travel reducer.

[0032] Optionally, the engineering machinery is a rotary drilling rig, a crawler crane or an excavator.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] The double-sided support mechanism ensures that the first and second fixed positions of the reducer of the crawler bridge are stressed to form a closed loop, and the structural strength and rigidity are more stable, which can be applied to more severe working conditions, and the thickness of the crawler frame is thinner, which is easy to design and manufacture. At the same time, the compact travel reducer with double-sided support enhances the structural rigidity of the reducer itself and the whole, making it more reliable in application.

[0035] The support form of the sprocket installed on the output shaft is changed from cantilever support to simply supported beam support, which greatly improves the radial load-bearing capacity of the reducer and has a wider range of applications.

[0036] The fixed brackets are installed at the first fixed position and the second fixed position by bolts, forming an over-static (over-constrained) mechanical structure. This over-static structure greatly enhances the structural rigidity of the reducer and the fixed bracket.

[0037] The special design of the output shaft structure can effectively transmit radial force while also effectively ensuring the sealing effect between the output shaft and the gear ring, greatly extending the service life of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a cross-sectional view of the overall structure of the embodiment of the present application.

[0039] Figure 2 It is an enlarged schematic diagram of part A in the figure.

[0040] Description of reference numerals:

[0041] 100, input shaft; 200, input planetary assembly; 201, first fixed position; 210, first sun gear; 211, first planetary gear; 212, first ring gear; 213, first planet carrier; 220, second sun gear; 221, second planetary gear; 222, second ring gear; 2221, second ring gear body; 2222, first connecting portion; 2223, first supporting portion; 223, second planet carrier; 230, first sealing ring; 240, first sealing member; 250, first mechanical seal; 300, intermediate transmission shaft; 400, output planetary assembly; 401, second fixed position; 410, third sun gear; 4 11. third planetary gear; 412. third ring gear; 413. third planetary carrier; 420. fourth sun gear; 421. fourth planetary gear; 422. fourth ring gear; 4221. fourth ring gear body; 4222. second support portion; 423. fourth planetary carrier; 500. output shaft; 501. output position; 510. long sleeve portion; 520. short output portion; 521. first labyrinth groove; 522. second labyrinth groove; 523. third labyrinth groove; 530. second seal; 540. second mechanical seal; 550. first support bearing; 560. second support bearing; 600. first end cover; 601. second end cover. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-Figure 2 This application is described in further detail.

[0043] The compact travel reducer with a double support structure provided in the embodiment of the present application is shown in FIG. Figure 1 The core structure of the invention includes an input shaft 100 , an input planetary assembly 200 , an intermediate transmission shaft 300 , an output planetary assembly 400 and a specially designed output shaft 500 .

[0044] First, the input shaft 100 is connected to an input motor, and the input motor drives the input shaft 100 to rotate. The input planetary assembly 200 includes a first sun gear 210, a first planetary gear 211, a first ring gear 212, a second sun gear 220, a second planetary gear 221, and a second ring gear 222. The input shaft 100 is connected to the input end of the first sun gear 210. The first sun gear 210, the first planetary gear 211, and the first ring gear 212 are meshed in sequence, and the second sun gear 220, the second planetary gear 221, and the second ring gear 222 are meshed in sequence. The first planetary gear 211 is connected to the second sun gear 220 through the first planet carrier 213, and the second planetary gear 221 is connected to the intermediate transmission shaft 300 through the second planet carrier 223. The intermediate transmission shaft 300 is coaxially arranged with the second sun gear 220. When the second sun gear 220 drives the second planetary gear 221 to rotate, the intermediate transmission shaft 300 is driven to rotate along its own axis through the second planet carrier 223, so as to achieve preliminary deceleration and torque increase.

[0045] Then, the power is transmitted to the output planetary assembly 400 through the intermediate transmission shaft 300, and the output planetary assembly 400 includes a third sun gear 410, a third planetary gear 411, a third ring gear 412, a fourth sun gear 420, a fourth planetary gear 421 and a fourth ring gear 422. The third sun gear 410 is fixed to the other end of the intermediate transmission shaft 300, the third sun gear 410, the third planetary gear 411 and the third ring gear 412 are meshed in sequence, the fourth sun gear 420, the fourth planetary gear 421 and the fourth ring gear 422 are meshed in sequence, the third planetary gear 411 is connected to the fourth sun gear 420 through the third planet carrier 413, and the fourth planetary gear 421 is connected to the output shaft 500 through the fourth planet carrier 423. Preferably, the third sun gear 410 is integrally arranged at the end of the intermediate transmission shaft 300, and the fourth sun gear 420 is rotatably sleeved on the outer periphery of the intermediate transmission shaft 300. This design can simplify the structure and improve the compactness of the internal space of the reducer. Finally, the power is outputted by the output shaft 500 connected to the output planetary assembly 400, further reducing speed and increasing torque.

[0046] More specifically, the design features of this compact travel reducer with a double-support structure are reflected in the stability and compactness of its structure. A first fixed position 201 and a second fixed position 401 are respectively provided on the outer walls of the second gear ring 222 and the fourth gear ring 422, and these two positions are used to install a fixed bracket, thereby forming a stable double-sided support structure. The outer wall of the output shaft 500 is provided with an output position 501 for installing a transmission device, and the output position 501 is located between the first fixed position 201 and the second fixed position 401. A transmission device such as a sprocket can be installed at the output position 501, and power is transmitted by the transmission device. The design of this double-sided support structure significantly improves the overall rigidity and stability of the reducer, enabling it to withstand greater radial forces, thereby extending the service life of the reducer.

[0047] Reference Figure 1 and Figure 2 Specifically, the output shaft 500 includes a long sleeve portion 510 and a short output portion 520. The long sleeve portion 510 is rotatably sleeved on the outer periphery of the intermediate transmission shaft 300. Preferably, the long sleeve portion 510 does not contact the intermediate transmission shaft 300 to reduce power transmission loss. The short output portion 520 is fixed to the middle of the outer wall of the long sleeve portion 510.

[0048] Specifically, the second ring gear 222 adopts a split design. The second ring gear 222 is composed of a second ring gear body 2221 and a detachable first mounting member. The second ring gear body 2221 is meshed with the second planetary gear 221 .

[0049] Preferably, the first mounting member includes a first connecting portion 2222 and a first supporting portion 2223. The first connecting portion 2222 can be detachably connected to the second ring gear body 2221 by connecting members such as bolts. The first supporting portion 2223 can also be detachably connected to the side of the first connecting portion 2222 away from the second ring gear body 2221 by connecting members such as bolts. The outer diameter of the first connecting portion 2222 is larger than the outer diameter of the first supporting portion 2223, so that there is sufficient space inside the reducer to install the second planetary gear 221, and the space at other positions of the reducer is reduced, making the reducer more compact.

[0050] Preferably, the first fixing position 201 is arranged at the stop and the end surface formed by the first connecting portion 2222 and the first supporting portion 2223 , and when the fixing bracket is installed at the first fixing position 201 , better support and connection can be achieved.

[0051] Reference Figure 1 and Figure 2, wherein the first support portion 2223 is further provided with a first sealing ring 230 and a first sealing member 240, the outer wall of the short output portion 520 is provided with a first labyrinth groove 521 and a second labyrinth groove 522, the first labyrinth groove 521 is further away from the long sleeve portion 510 than the second labyrinth groove 522, the first sealing ring 230 is inserted into the first labyrinth groove 521 and is rotatably connected to the groove wall of the first labyrinth groove 521, and the first sealing member 240 is inserted into the second labyrinth groove 522 and is rotatably connected to the second labyrinth groove 522. Optionally, the first sealing member 240 is an elastic sealing ring.

[0052] In addition, a first mechanical seal 250 is further disposed between the first support portion 2223 and the short output portion 520. The first mechanical seal 250 is closer to the long sleeve portion 510 than the first seal 240 to achieve dynamic sealing between the first support portion 2223 and the short output portion 520. By disposing the first sealing ring 230, the first seal 240 and the first mechanical seal 250, the sealing effect between the first support portion 2223 and the short output portion 520 can be effectively improved, thereby extending the service life of the reducer.

[0053] More importantly, the setting of the first support portion 2223 enables a first support bearing 550 to be installed between the first support portion 2223 and the long sleeve portion 510 in the radial direction. The high radial load of the output shaft 500 can be transmitted to the second ring gear 222 through the first support bearing 550, and then to the fixed bracket, thereby realizing the function of the reducer to withstand high radial loads.

[0054] Similarly, for the design of the fourth gear ring 422, this embodiment also adopts the design idea of ​​a split structure. The fourth gear ring 422 is composed of a fourth gear ring body 4221 and a detachable second support portion 4222. The fourth gear ring body 4221 is meshed with the fourth planetary gear 421, and the second support portion 4222 can be connected to the fourth gear ring body 4221 by bolts. Preferably, the third gear ring 412 and the fourth gear ring 422 are gear rings with the same inner diameter, which further improves the compactness of the structure.

[0055] The outer wall of the short output part 520 is provided with a third labyrinth groove 523, the output position 501 is located radially outside the third labyrinth groove 523, the second support part 4222 extends from the side of the fourth gear ring body 4221 to the long sleeve part 510 and is embedded in the third labyrinth groove 523, and the second support part 4222 is rotatably connected to the inside of the third labyrinth groove 523. Preferably, the notch size of the third labyrinth groove 523 increases from the inside of the short output part 520 to the outside and toward the outer diameter of the second support part 4222, so that the volume of the second support part 4222 close to the long sleeve part 510 is larger and the structure is more compact, which is more conducive to enhancing the stability of the structure during the force transmission process.

[0056] At this time, a second support bearing 560 is disposed between one side of the second support portion 4222 in the radial direction and the long sleeve portion 510, and the second support bearing 560 is used to transmit the radial high load force of the output shaft 500 to the second support portion 4222, and then to the fixed bracket by the second support portion 4222, so as to realize the function of the reducer bearing high radial load. Preferably, the first support bearing 550 and the second support bearing 560 are double tapered roller bearings.

[0057] In addition, a second seal 530 and a second mechanical seal 540 are provided between the second support portion 4222 and the short output portion 520, and the second mechanical seal 540 is closer to the long sleeve portion 510 than the second seal 530. The second seal 530 and the second mechanical seal 540 further enhance the sealing effect between the second support portion 4222 and the short output portion 520.

[0058] In summary, fixed brackets are respectively installed at the first fixed position 201 and the second fixed position 401, and the fixed brackets are used to support the high radial load of the output shaft 500. This can transform the cantilever support in the related technology into a simply supported beam support, greatly improving the radial load-bearing capacity of the reducer, and the reducer has a wider range of uses.

[0059] Preferably, the distance between the output position 501 and the second fixed position 401 is smaller than the distance between the output position 501 and the first fixed position 201. Since the fourth gear ring 422 is a component that mainly bears torque, and the second gear ring 222 is a component that secondarily bears torque, the above design can further ensure that the forces on the second gear ring 222 and the fourth gear ring 422 are balanced, thereby increasing the structural stability.

[0060] In addition, a first end cover 600 is connected to one side of the second gear ring 222, and a second end cover 601 is connected to one side of the third gear ring 412. The first end cover 600 and the second end cover 601 are combined with the gear ring to form a closed space inside the reducer. At the same time, the second end cover 601 is rotatably connected to the end of the intermediate transmission shaft 300 away from the input planetary assembly 200 through a bearing, which can improve the transmission stability of the intermediate transmission shaft 300.

[0061] The double-support structure design of the travel reducer provides a stable support foundation for engineering machinery. The double-sided support mechanism ensures that the first fixed position 201 and the second fixed position 401 of the reducer of the crawler bridge are stressed to form a closed loop. The structural strength and rigidity are more stable and can be applied to more severe working conditions. The thickness of the crawler frame is thinner, which is easy to design and manufacture. At the same time, the compact travel reducer with double-sided support enhances the rigidity of the reducer itself, making it more reliable in application.

[0062] The embodiment of the present application further provides an engineering machine using the compact travel reducer of the aforementioned double support structure. Specifically, the engineering machine significantly improves its performance in terms of structural rigidity, stability and service life by adopting the innovative travel reducer of the present application.

[0063] In practical applications, this type of engineering machinery is particularly suitable for heavy equipment such as rotary drilling rigs, crawler cranes or excavators. In these equipment, the travel reducer, as a key transmission component, undertakes the important task of reducing the input shaft speed by 100 and increasing the output shaft torque by 500. By being equipped with the compact travel reducer with a double support structure of the present application, these engineering machinery can maintain efficient and stable operation in harsh working environments.

[0064] More importantly, through practical application verification, the engineering machinery equipped with the travel reducer of this application has achieved remarkable results in reducing maintenance costs, reducing downtime and improving economic benefits. These practical results fully prove the outstanding contribution of the compact travel reducer of the double-support structure of this application in improving the overall performance of engineering machinery.

[0065] The core implementation principle of this embodiment is that by adopting a compact travel reducer with an innovative double-support structure, the reducer is effectively fixed and fully supported, thereby greatly improving its structural rigidity and stability. At the same time, through a compact layout and carefully optimized structural design, the reducer can maintain excellent transmission performance while occupying a smaller space. These significant advantages make the travel reducer introduced in this application show broad application prospects in the field of engineering machinery.

[0066] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A compact travel reducer with a double support structure, characterized in that: include: InputShaft(100); An input planetary assembly (200) comprises a first sun gear (210), a first planetary gear (211), a first ring gear (212), a second sun gear (220), a second planetary gear (221) and a second ring gear (222); the input shaft (100) is connected to the input end of the first sun gear (210); the first sun gear (210), the first planetary gear (211) and the first ring gear (212) are meshed in sequence; the second sun gear (220), the second planetary gear (221) and the second ring gear (222) are meshed in sequence; and the first planetary gear (211) is connected to the second sun gear (220) via a first planet carrier (213); An intermediate transmission shaft (300), the second planetary gear (221) is connected to the intermediate transmission shaft (300) via a second planetary carrier (223), and the intermediate transmission shaft (300) and the second sun gear (220) are coaxially arranged; The output planetary assembly (400) comprises a third sun gear (410), a third planetary gear (411), a third ring gear (412), a fourth sun gear (420), a fourth planetary gear (421) and a fourth ring gear (422); the third sun gear (410) is fixed to the other end of the intermediate transmission shaft (300); the third sun gear (410), the third planetary gear (411) and the third ring gear (412) are meshed in sequence; the fourth sun gear (420), the fourth planetary gear (421) and the fourth ring gear (422) are meshed in sequence; the third planetary gear (411) is connected to the fourth sun gear (420) via a third planet carrier (413); and the fourth planetary gear (421) is connected to the output shaft (500) via a fourth planet carrier (423); The outer wall of the second gear ring (222) is provided with a first fixing position (201) for mounting a fixing bracket, the outer wall of the fourth gear ring (422) is provided with a second fixing position (401) for mounting a fixing bracket, and the outer wall of the output shaft (500) is provided with an output position (501) for mounting a transmission device, and the output position (501) is located between the first fixing position (201) and the second fixing position (401).

2. According to the compact travel reducer with double support structure as claimed in claim 1, it is characterized by: The distance between the output position (501) and the second fixed position (401) is smaller than the distance between the output position (501) and the first fixed position (201).

3. According to the compact travel reducer with double support structure as claimed in claim 1, it is characterized in that: The output shaft (500) comprises a long sleeve portion (510) and a short output portion (520); the long sleeve portion (510) is rotatably sleeved on the outer circumference of the intermediate transmission shaft (300); the short output portion (520) is fixed to the middle portion of the outer wall of the long sleeve portion (510); a first support bearing (550) is provided between the second gear ring (222) and the long sleeve portion (510) in the radial direction; and a second support bearing (560) is provided between the fourth gear ring (422) and the long sleeve portion (510) in the radial direction.

4. The compact travel reducer with a double support structure according to claim 3 is characterized in that: The second gear ring (222) comprises a second gear ring body (2221) and a first mounting member detachably connected to the second gear ring body (2221); a first sealing ring (230) and a first sealing member (240) are arranged on the first mounting member; a first labyrinth groove (521) and a second labyrinth groove (522) are provided on the outer wall of the short output portion (520); the first labyrinth groove (521) is further away from the long sleeve portion (510) than the second labyrinth groove (522); the first sealing ring (230) is inserted into the first labyrinth groove (521) and is rotatably connected to the groove wall of the first labyrinth groove (521); and the first sealing member (240) is inserted into the second labyrinth groove (522) and is rotatably connected to the groove wall of the second labyrinth groove (522).

5. The compact travel reducer with a double support structure according to claim 4 is characterized in that: The first mounting member comprises a first connecting portion (2222) and a first supporting portion (2223); the first connecting portion (2222) is detachably connected to the second gear ring body (2221); the first supporting portion (2223) is detachably connected to a side of the first connecting portion (2222) away from the second gear ring body (2221); the outer diameter of the first connecting portion (2222) is greater than the outer diameter of the first supporting portion (2223); the first fixing position (201) is arranged at a stop and an end surface formed by the first connecting portion (2222) and the first supporting portion (2223); a first mechanical seal (250) is arranged between the first supporting portion (2223) and the short output portion (520); the first mechanical seal (250) is closer to the long sleeve portion (510) than the first seal (240); and the first supporting bearing (550) is located between the first supporting portion (2223) and the long sleeve portion (510).

6. The compact travel reducer with a double support structure according to claim 3 is characterized in that: The fourth gear ring (422) comprises a fourth gear ring body (4221) and a second support portion (4222) detachably connected to the fourth gear ring body (4221); a third labyrinth groove (523) is provided on the outer wall of the short output portion (520); the output position (501) is located on the outer side of the short output portion (520) away from the third labyrinth groove (523); the second support portion (4222) is embedded in the third labyrinth groove (523) and is rotatably connected to the inside of the third labyrinth groove (523); and the second support bearing (560) is located between the second support portion (4222) and the long sleeve portion (510).

7. The compact travel reducer with a double support structure according to claim 6, characterized in that: The slot size of the third labyrinth slot (523) increases from the inside of the short output portion (520) toward the outside and toward the outer diameter of the second support portion (4222).

8. The compact travel reducer with a double support structure according to claim 6, characterized in that: A second seal (530) and a second mechanical seal (540) are provided between the second support portion (4222) and the short output portion (520); the second mechanical seal (540) is closer to the long sleeve portion (510) than the second seal (530).

9. An engineering machine, characterized in that: The invention comprises the travel reducer according to any one of claims 1 to 8.

10. The construction machine according to claim 9, characterized in that: The engineering machinery is a rotary drilling rig, a crawler crane or an excavator.

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