Lubricating and sealing structure for shield main speed reducer

Abstract

The utility model discloses a lubrication sealing structure for a shield main speed reducer, which belongs to the technical field of speed reducer lubrication and comprises a water box seat, an input gear sleeve, two input bearings and a primary sun gear. A plurality of oil channels extending in the length direction of the water box base are formed in the inner ring of the water box base in the circumferential direction. And the input gear sleeve is rotationally connected with the inner ring of the water box seat. And the two input bearings are respectively arranged between the input gear sleeve and the water box seat. The first-stage sun gear is matched with the input gear sleeve, and an oil distribution channel is formed between the first-stage sun gear and the water box base. The multiple oil channels are used for conveying lubricating oil to the two input bearings, the input gear sleeve, the first-stage sun gear and other components from the oil distribution channel, full lubrication of all component structures is achieved, and abrasion is reduced. The communicating structures of all the oil channels achieve input and output of lubricating oil, so that the lubricating oil can circularly flow in the whole flow channel system, and the input gear sleeve and the input bearing are effectively cooled and cleaned.

Description

Technical Field

[0001] This utility model belongs to the field of speed reducer lubrication technology, specifically a lubrication and sealing structure for a tunnel boring machine main speed reducer. Background Technology

[0002] Tunnel boring machines (TBMs), as efficient and safe tunneling equipment, are widely used in the construction of tunnels in urban subways, railways, and highways. The main reducer, as the core transmission component of the TBM, directly affects its tunneling efficiency and reliability. The input gear sleeve, as one of the key components of the main reducer, plays a crucial role in transmitting power and bearing loads.

[0003] Currently, traditional tunnel boring machine (TBM) main reducer input sleeves typically employ either splash lubrication or oil bath lubrication. Splash lubrication relies on the rotation of gears to throw lubricating oil up to lubricate the sleeve, but it suffers from uneven lubrication and difficulty in controlling the oil volume, easily leading to insufficient lubrication in certain areas, such as the front cover and bearing spacer sleeve, resulting in excessively high oil seal temperatures during gearbox operation. While oil bath lubrication ensures the sleeve is immersed in lubricating oil, high-speed operation can cause oil churning losses, leading to increased oil temperature, reduced lubrication effectiveness, and increased energy consumption. Furthermore, neither of these lubrication methods creates a circulating flow effect, preventing the effective removal of metal shavings generated from input sleeve wear. Utility Model Content

[0004] The purpose of this invention is to provide a lubrication and sealing structure for a shield tunnel main reducer, so as to solve the problems mentioned in the prior art.

[0005] A lubrication and sealing structure for a tunnel boring machine main reducer is provided, comprising:

[0006] Water tank seat, wherein the inner circumference of the water tank seat is provided with a plurality of oil passages extending along the length of the water tank seat;

[0007] An input gear sleeve is rotatably connected to the inner ring of the water tank seat;

[0008] Two input bearings are respectively disposed between the input gear sleeve and the water tank seat;

[0009] The first-stage sun gear, which cooperates with the input gear sleeve and forms an oil distribution channel between itself and the water tank seat.

[0010] Furthermore, a bearing spacer sleeve is provided between the outer rings of the two input bearings, and the bearing spacer sleeve has several first through holes running through it circumferentially. The two input bearings are axially positioned by the bearing spacer sleeve, and the first through holes on the bearing spacer sleeve can guide lubricating oil from the oil passage to the space between the two input bearings, thereby improving the lubricating oil flow rate in this area.

[0011] Furthermore, an end cap assembly is provided at the end of the water tank seat and the input gear sleeve that is away from the oil distribution channel. The end cap assembly is used to seal the end of the oil passage away from the oil distribution channel to form a seal, and to ensure that the water tank seat and the input gear sleeve can still rotate relative to each other.

[0012] Furthermore, an end cover spacer sleeve is provided between the end cover assembly and the adjacent input bearing. The end cover spacer sleeve mates with the outer ring of the input bearing, and the end cover spacer sleeve has several second through holes extending circumferentially. The input bearing and the end cover assembly are axially positioned by the end cover spacer sleeve, and the second through holes on the end cover spacer sleeve can guide lubricating oil from the oil passage between the input bearing and the end cover assembly, improving the lubricating oil flow rate in this area.

[0013] Furthermore, the end cap assembly includes a front end cap, a lip seal ring, and an input bushing. The front end cap is fixedly connected to the water tank seat, the input bushing is interference-fitted with the input gear sleeve, and the lip seal ring is disposed between the front end cap and the input bushing. A retaining ring on the front end cap fixes the lip seal ring, and the lip seal ring contacts the input bushing to achieve a sealing effect. The input bushing rotates synchronously with the input gear sleeve.

[0014] Furthermore, a third through hole is formed between the front end cover and the water tank seat. The third through hole can guide the lubricating oil in the oil passage to the lip seal ring, forming lubrication between the lip seal ring and the input bushing, and reducing the heat generated by the rotation of the lip seal ring.

[0015] Furthermore, the primary sun gear is splinedly connected to the input gear sleeve, and a grinding block is provided between the primary sun gear and the input gear sleeve. The input gear sleeve has several fourth through holes circumferentially penetrating it, communicating with its internal cavity. The splined mating portion of the primary sun gear and the input gear sleeve forms a spline clearance. The fourth through holes and the spline clearance allow lubricating oil to be introduced into the input gear sleeve. The viscosity of the lubricating oil carries away iron filings generated by the spline friction between the input gear sleeve and the primary sun gear, ensuring the cleanliness of the gearbox interior.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The inner ring of the water tank housing is equipped with several oil passages to deliver lubricating oil from the oil distribution channel to components such as the two input bearings, input gear sleeve, and the first-stage sun gear, ensuring adequate lubrication of all components and reducing wear. During the relative rotation of the input gear sleeve and the water tank housing, the interconnected structure of the oil passages enables the input and output of lubricating oil, allowing it to circulate throughout the entire flow system. This effectively cools and cleans the input gear sleeve and input bearings, reducing the heat generated by the rotation of the input bearings and oil seals, and extending their service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a lubrication and sealing structure for a tunnel boring machine's main reducer;

[0020] Figure 2 A schematic diagram of the structure of the water tank holder provided by this utility model.

[0021] In the diagram: 1. Water tank seat; 11. Oil passage; 2. Input gear sleeve; 21. Fourth through hole; 3. Input bearing; 31. Bearing spacer sleeve; 32. First through hole; 4. First-stage sun gear; 41. Grinding block; 5. Oil distribution channel; 6. End cover assembly; 61. Front end cover; 62. Lip seal ring; 63. Input bushing; 64. Third through hole; 7. End cover spacer sleeve; 71. Second through hole; 8. Spline clearance. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0023] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0024] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0025] Please see Figure 1-2 As shown in the embodiment of this utility model, a lubrication and sealing structure for a shield tunnel main reducer includes a water tank seat 1, an input gear sleeve 2, two input bearings 3, and a first-stage sun gear 4. The inner ring of the water tank seat 1 has several oil passages 11 extending along its length in the circumferential direction. The input gear sleeve 2 is rotatably connected to the inner ring of the water tank seat 1. The two input bearings 3 are respectively disposed between the input gear sleeve 2 and the water tank seat 1. The first-stage sun gear 4 cooperates with the input gear sleeve 2 and forms an oil distribution channel 5 between itself and the water tank seat 1.

[0026] The input gear sleeve 2 is used for speed and torque input. It is fixed to the central cavity of the water tank 1 by two input bearings 3. The inner rings of the two input bearings 3 are axially positioned using retaining rings and the shoulders of the input gear sleeve 2, while the outer rings are axially positioned using the bearing shoulders of the water tank 1 and the bearing spacer sleeve 31. The oil passage 11 ensures that lubricating oil is evenly distributed to the input gear sleeve 2 and input bearings 3, achieving sufficient lubrication and reducing wear. The oil distribution channel 5 serves as the main input and output channel for lubricating oil, allowing for oil circulation, effectively cooling and cleaning the input gear sleeve 2 and input bearings 3, and extending their service life. The circulating lubrication system formed by the bearing spacer sleeve 31 and the input gear sleeve 2 effectively reduces the heat generated by the rotation of the input bearings 3 and also cleans the gearbox.

[0027] The two input bearings 3 are axially positioned by a bearing spacer 31. The bearing spacer 31 has several first through holes 32 for the flow of lubricating oil. The design of the bearing spacer 31 ensures that the lubricating oil is evenly distributed between the two input bearings 3, avoiding the problem of insufficient lubrication in certain areas caused by lubricating oil flowing through a single channel sequentially from the two input bearings 3.

[0028] An end cap assembly 6 is provided at the end of the water tank seat 1 away from the oil distribution channel 5 between the input gear sleeve 2 and the water tank seat 1. The end cap assembly 6 effectively prevents lubricating oil leakage and ensures the sealing of the lubrication system. An end cap spacer 7 is provided between the end cap assembly 6 and the adjacent input bearing 3. The front end cap 61 inside the end cap assembly 6 is fixed to the water tank seat 1 by fixing bolts. The front end cap 61 presses against the end cap spacer 7 and forms an axial position for the two input bearings 3. The end cap spacer 7 has several second through holes 71 extending circumferentially. The second through holes 71 allow the lubricating oil to be evenly distributed, improving the lubrication effect.

[0029] The end cap assembly 6 includes a front end cap 61, a lip seal 62, and an input bushing 63. The lip seal 62 contacts the input bushing 63 to achieve a sealing effect, and the input bushing 63 rotates synchronously with the input gear sleeve 2. The contact sealing design between the lip seal 62 and the input bushing 63 effectively prevents lubricating oil leakage and the entry of external impurities, improves sealing performance, and does not interfere with rotation, ensuring that the water tank seat 1 and the input gear sleeve 2 can still rotate relative to each other.

[0030] A third through hole 64 is formed between the front cover 61 and the water tank seat 1. The front cover 61 forms a labyrinth-shaped passage and sealing structure through the third through hole 64. During gearbox operation, the front cover 61 is always in an oil-filled state. Therefore, the designed labyrinth-shaped sealing structure helps to improve the sealing effect of the gearbox and ensure the gearbox's sealing performance.

[0031] The output end of the input gear sleeve 2 is connected to the first-stage sun gear 4 via a spline. To ensure the axial clearance of the entire gearbox, a grinding block 41 needs to be installed between the first-stage sun gear 4 and the input gear sleeve 2. The spline mating part between the first-stage sun gear 4 and the input gear sleeve 2 forms a spline clearance 8, which is the gap formed between the spline tip and the input gear sleeve 2.

[0032] Lubricating oil enters through the oil distribution channel 5, and then flows through several oil passages 11 evenly distributed on the water tank seat 1 into the bearing spacer sleeve 31, end cover spacer sleeve 7, and front end cover 61 respectively. It then flows through the first through hole 32, the second through hole 71, and the third through hole 64 into the corresponding areas. The oil passages 11 evenly distributed on the water tank seat 1 serve as ventilation and oil inlet / outlet ports for lubricating oil circulation. Several first through holes 32 are evenly distributed around the circumference of the bearing spacer sleeve 31, serving as ventilation, oil supply, and lubrication points. Lubricating oil entering through the oil passages 11 passes through the first through holes 32 on the bearing spacer sleeve 31 into the space between a pair of input bearings 3, where the circulating lubricating oil lubricates the input bearings 3. Meanwhile, several fourth through holes 21 are evenly distributed on the input gear sleeve 2. The lubricating oil from the bearing spacer sleeve 31 can also enter the interior of the input gear sleeve 2 through the fourth through holes 21 and flow out through the spline clearance 8 for circulation. At the same time, the viscosity of the lubricating oil carries away the iron filings generated by the spline friction between the input gear sleeve 2 and the first-stage sun gear 4 from the spline contact area, ensuring the cleanliness of the gearbox interior. The lubricating oil in the oil passage 11 enters the cavity between the end cover assembly 6 and the input bearing 3 through several second through holes 71 evenly distributed on the end cover spacer sleeve 7, simultaneously supplying oil and lubricating the input bearing 3 and the end cover assembly 6, and flows out through the oil passage of the third through hole 64, forming a complete circulating lubrication system. The circulating lubrication system helps to reduce the heat generated by rotating the bearing and oil seal, thereby reducing the internal temperature of the gearbox.

[0033] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A lubrication and sealing structure for a shield tunneling main reducer, characterized in that, include: Water tank seat (1), the inner ring of the water tank seat (1) is provided with a plurality of oil passages (11) extending along the length direction of the water tank seat (1) in the circumferential direction; Input gear sleeve (2), which is rotatably connected to the inner ring of the water tank seat (1); Two input bearings (3) are respectively disposed between the input gear sleeve (2) and the water tank seat (1); The first-stage sun gear (4) cooperates with the input gear sleeve (2) and forms an oil distribution channel (5) between it and the water tank seat (1).

2. The lubrication and sealing structure for a shield tunnel main reducer according to claim 1, characterized in that, A bearing spacer sleeve (31) is provided between the outer rings of the two input bearings (3), and the bearing spacer sleeve (31) has a plurality of first through holes (32) extending through it in the circumferential direction.

3. The lubrication and sealing structure for a shield tunnel main reducer according to claim 1, characterized in that, An end cap assembly (6) is provided at the end of the water tank seat (1) and the input gear sleeve (2) away from the oil distribution channel (5).

4. The lubrication and sealing structure for a shield tunnel main reducer according to claim 3, characterized in that, An end cap spacer sleeve (7) is provided between the end cap assembly (6) and the adjacent input bearing (3). The end cap spacer sleeve (7) is engaged with the outer ring of the input bearing (3). The end cap spacer sleeve (7) has several second through holes (71) extending circumferentially.

5. The lubrication and sealing structure for a shield tunnel main reducer according to claim 3, characterized in that, The end cap assembly (6) includes a front end cap (61), a lip seal ring (62), and an input bushing (63). The front end cap (61) is fixedly connected to the water tank seat (1), the input bushing (63) is interference-fitted with the input gear sleeve (2), and the lip seal ring (62) is disposed between the front end cap (61) and the input bushing (63).

6. A lubrication and sealing structure for a shield tunneling main reducer according to claim 5, characterized in that, A third through hole (64) is formed between the front end cover (61) and the water tank seat (1).

7. The lubrication and sealing structure for a shield tunnel main reducer according to claim 1, characterized in that, The first-stage sun gear (4) is splinedly connected to the input gear sleeve (2). A grinding block (41) is provided between the first-stage sun gear (4) and the input gear sleeve (2). The input gear sleeve (2) has several fourth through holes (21) that communicate with the internal cavity of the input gear sleeve (2) along the circumferential direction. The spline mating part of the first-stage sun gear (4) and the input gear sleeve (2) forms a spline top clearance (8).

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