Oil seal transmission shaft assembly

Abstract

The utility model discloses an oil seal transmission shaft assembly, which relates to the technical field of screw drills, and comprises a transmission shaft and a transmission shaft shell arranged on the outer side of the transmission shaft, a piston shell is arranged at the upper end of the transmission shaft shell, a piston is arranged in the piston shell, the piston is wrapped on the outer side of the transmission shaft, and an annular plate is fixedly arranged on the top of the piston shell. The annular plate is sleeved with the transmission shaft, an annular groove is formed in the inner wall of the annular plate, an annular sealing air bag is placed in the annular groove, the inner wall of the annular sealing air bag is in contact fit with the shaft wall of the transmission shaft, and air inlet limiting mechanisms are arranged at the two ends of the outer wall of the annular sealing air bag. According to the transmission shaft assembly, the sealing ring assembly in the transmission shaft assembly can be arranged at the top of the piston shell, an oil way in the transmission shaft can be effectively sealed, meanwhile, the internal sealing assembly can be conveniently and rapidly detached and replaced, and the using effect of the transmission shaft assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of positive displacement motors, in particular to an oil-sealed drive shaft assembly. Background Art

[0002] The oil-sealed drive shaft assembly is an important mechanical transmission device, designed to ensure the stable operation of the drive shaft and extend its service life through oil sealing. It is also one of the main components inside the positive displacement motor.

[0003] After retrieval, the patent document with the publication number of CN206205777U discloses an oil-sealed drive shaft assembly of a positive displacement motor. The drive shaft assembly includes a drive shaft, a bearing housing, a piston housing, and a sealing cap. The sealing cap, bearing housing, and piston housing are sequentially sleeved on the drive shaft and connected in sequence. An upper thrust bearing and a lower thrust bearing are installed between the drive shaft and the bearing housing. The necked-down part of the inner hole of the bearing housing separates the upper thrust bearing and the lower thrust bearing. A lower sliding sleeve is installed between the outer diameter of the drive shaft below the lower thrust bearing and the inner hole of the bearing housing. An upper sliding sleeve is installed between the inner hole of the necked-down part of the inner hole of the bearing housing and the drive shaft. An open snap ring is installed on the drive shaft neck above the upper thrust bearing, and a lower sealing ring set is installed in the inner hole of the sealing cap. A piston is installed between the piston housing and the drive shaft neck. A piston outer sealing ring set is installed between the outer diameter of the piston and the inner hole of the piston. A piston inner sealing ring set is installed between the inner hole of the piston and the drive shaft neck. The uppermost end of the drive shaft is connected to a water cap.

[0004] However, all the sealing rings provided inside the above drive shaft assembly are arranged inside the piston housing. With the frequent longitudinal movement of the piston, even if the sealing rings do not come into contact with external debris, they will wear due to friction. At the same time, because the sealing rings are embedded, the operation is rather cumbersome when the sealing rings need to be replaced, reducing the use effect of the drive shaft assembly. Summary of the Utility Model

[0005] In view of the problems existing in the above-mentioned existing oil-sealed drive shaft assembly, the present utility model is proposed.

[0006] Therefore, the purpose of the present utility model is to provide an oil-sealed drive shaft assembly, which solves the problem that the sealing rings of the existing drive shaft assembly are embedded, making it inconvenient to take out and replace the sealing rings quickly and conveniently when the sealing rings are worn.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] An oil-sealed drive shaft assembly includes a drive shaft and a drive shaft housing disposed outside the drive shaft. A piston housing is provided at the upper end of the drive shaft housing. A piston is provided inside the piston housing. The piston is wrapped around the outside of the drive shaft. A circular plate is fixedly provided at the top of the piston housing. The circular plate is sleeved on the drive shaft. An annular groove is formed in the inner wall of the circular plate. An annular sealing airbag is placed inside the annular groove;

[0009] The inner wall of the annular sealing airbag is in contact and cooperation with the shaft wall of the drive shaft. Air inlet limiting mechanisms are provided at both ends of the outer wall of the annular sealing airbag.

[0010] Preferably, the air inlet limiting mechanism includes an air inlet pipe. The air inlet pipe is in contact and cooperation with the inner wall of the annular sealing airbag. A sliding hole is jointly formed between the annular groove and the side of the circular plate. The air inlet pipe is slidably disposed in the sliding hole;

[0011] A positioning rod is provided inside the air inlet pipe. A clamping plate is fixedly provided at the end of the positioning rod. A clamping groove is formed in the outer wall of the circular plate. The clamping groove is communicated with the sliding hole. The clamping plate is clamped in the clamping groove.

[0012] Preferably, two symmetrically arranged inner sealing rings are fixedly provided on the inner wall of the annular sealing airbag. The inner walls of both inner sealing rings are in contact and cooperation with the shaft wall of the drive shaft.

[0013] Preferably, the rod wall of the positioning rod is provided with connecting threads. The air inlet pipe is an internally threaded pipe. The positioning rod is threadedly disposed inside the air inlet pipe.

[0014] Furthermore, internal hexagonal grooves are formed on the sides of both clamping plates away from each other.

[0015] Preferably, the circular plate is fixedly welded to the top of the piston housing.

[0016] In the above technical solution, the technical effects and advantages provided by the present utility model are:

[0017] 1. In the present utility model, by providing a piston housing, a circular plate, an annular groove, an annular sealing airbag and inner sealing rings, the sealing ring assembly inside the drive shaft assembly can be arranged at the top of the piston housing, which can effectively seal the oil circuit inside the drive shaft and facilitate the quick disassembly and replacement of the internal sealing components, improving the use effect of the drive shaft assembly.

[0018] 2. In the present utility model, by providing an annular sealing ring, a circular plate and an air inlet limiting mechanism, the installation position of the annular sealing airbag is fixed, improving the stability of the annular sealing airbag during use. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic structural view of the present utility model;

[0021] Figure 2 of the present utility model Figure 1 is an enlarged schematic view of part A;

[0022] Figure 3 is a three-dimensional structural view of the annular sealing airbag of the present utility model.

[0023] Explanation of reference numerals:

[0024] 1, drive shaft; 2, drive shaft housing; 3, piston housing; 4, piston; 5, annular plate; 6, annular groove; 7, annular sealing airbag; 8, intake pipe; 9, sliding hole; 10, positioning rod; 11, clamping plate; 12, clamping groove; 13, inner sealing ring; 14, internal hexagonal groove. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail with reference to the drawings.

[0026] An embodiment of the present utility model discloses an oil-sealed drive shaft assembly.

[0027] Embodiment 1

[0028] The present utility model provides an oil-sealed drive shaft assembly as Figures 1-3 shown, which includes a drive shaft 1 and a drive shaft housing 2 provided outside the drive shaft 1. A piston housing 3 is provided at the upper end of the drive shaft housing 2. A piston 4 is provided inside the piston housing 3. The piston 4 is wrapped around the outside of the drive shaft 1. A top of the piston housing 3 is fixedly provided with an annular plate 5. The annular plate 5 is fixedly welded to the top of the piston housing 3. The annular plate 5 is sleeved on the drive shaft 1. An inner wall of the annular plate 5 is provided with an annular groove 6. An annular sealing airbag 7 is placed inside the annular groove 6. Two symmetrically arranged inner sealing rings 13 are fixedly provided on an inner wall of the annular sealing airbag 7. Inner walls of both inner sealing rings 13 are in contact and cooperation with a shaft wall of the drive shaft 1.

[0029] When the drive shaft assembly is running, the annular sealing airbag 7 is wrapped around the outside of the drive shaft 1 through the annular plate 5 and is arranged at the top of the piston housing 3. At this time, the annular sealing airbag 7 is inflated with a fault, and cooperates with the inner sealing ring 13 to seal and wrap the drive shaft 1, so that when the drive shaft assembly is working, it can effectively block external impurities, enabling the piston 4 to cooperate with the drive shaft 1 for stable oil sealing. At the same time, since the annular sealing airbag 7 is arranged on the outside of the drive shaft 1, when the drive shaft assembly needs to be overhauled, the annular sealing airbag 7 can be quickly pulled out of the annular plate 5 for replacement, improving the convenience and usage effect of the drive shaft assembly.

[0030] Embodiment 2

[0031] On the basis of Embodiment 1, in order to be able to determine the use position of the annular sealing airbag 7 and facilitate the quick disassembly of the annular sealing airbag 7, as Figures 2-3 shown, the inner wall of the annular sealing airbag 7 is in contact and cooperation with the shaft wall of the drive shaft 1. Both ends of the outer wall of the annular sealing airbag 7 are provided with air intake limiting mechanisms. The air intake limiting mechanism includes an air inlet pipe 8, and the air inlet pipe 8 is in contact and cooperation with the inner wall of the annular sealing airbag 7. A sliding hole 9 is jointly opened between the annular groove 6 and the side part of the annular plate 5, and the air inlet pipe 8 is slidably arranged in the sliding hole 9;

[0032] A positioning rod 10 is arranged inside the air inlet pipe 8. A connecting thread is provided on the rod wall of the positioning rod 10. The air inlet pipe 8 is an internally threaded pipe, and the positioning rod 10 is threaded inside the air inlet pipe 8. A clamping plate 11 is fixedly arranged at the end of the positioning rod 10. A clamping groove 12 is opened on the outer wall of the annular plate 5, and the clamping groove 12 is communicated with the sliding hole 9. The clamping plate 11 is clamped in the clamping groove 12. Inner hexagonal grooves 14 are opened on one side of the two clamping plates 11 away from each other.

[0033] When the annular sealing airbag 7 needs to be used for sealing, the annular sealing airbag 7 is inflated through the two air inlet pipes 8 and can be sealed and wrapped around the outside of the drive shaft 1. Subsequently, the positioning rod 10 can be screwed into the air inlet pipe 8, and the clamping plate 11 can be rotated into the clamping groove 12. Through the limiting setting of the clamping plate 11 and the clamping groove 12, the setting position of the annular sealing airbag 7 can be fixed to ensure the sealing effect. When the annular sealing airbag 7 needs to be disassembled, an external hexagonal wrench or the like is used to rotate the clamping plate 11, so that the positioning rod 10 can be pulled out of the air inlet pipe 8. At the same time, with the sliding fit of the air inlet pipe 8 and the sliding hole 9, the annular sealing airbag 7 can be pulled out of the annular groove 6 for disassembly.

[0034] Only some exemplary embodiments of the present utility model have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present utility model.

Claims

1. An oil-sealed drive shaft assembly, comprising a drive shaft (1) and a drive shaft housing (2) disposed outside the drive shaft (1), characterized in that, The upper end of the transmission shaft housing (2) is provided with a piston housing (3). Inside the piston housing (3), there is a piston (4). The piston (4) is wrapped around the outside of the transmission shaft (1). The top of the piston housing (3) is fixedly provided with an annular plate (5). The annular plate (5) is sleeved on the transmission shaft (1). An annular groove (6) is formed in the inner wall of the annular plate (5). An annular sealing airbag (7) is placed inside the annular groove (6). The inner wall of the annular sealing airbag (7) is in contact and cooperation with the shaft wall of the transmission shaft (1). Both ends of the outer wall of the annular sealing airbag (7) are provided with air intake limiting mechanisms.

2. The oil-sealed drive shaft assembly according to claim 1, characterized in that, The air intake limiting mechanism includes an air inlet pipe (8). The air inlet pipe (8) is in contact and cooperation with the inner wall of the annular sealing airbag (7). A sliding hole (9) is jointly formed between the annular groove (6) and the side part of the annular plate (5). The air inlet pipe (8) is slidably arranged in the sliding hole (9). A positioning rod (10) is arranged inside the air inlet pipe (8). A clamping plate (11) is fixedly provided at the end of the positioning rod (10). A clamping groove (12) is formed in the outer wall of the annular plate (5). The clamping groove (12) is communicated with the sliding hole (9). The clamping plate (11) is clamped in the clamping groove (12).

3. The oil-sealed drive shaft assembly according to claim 1, characterized in that, Two symmetrically arranged inner sealing rings (13) are fixedly provided on the inner wall of the annular sealing airbag (7). The inner walls of both inner sealing rings (13) are in contact and cooperation with the shaft wall of the transmission shaft (1).

4. The oil-sealed drive shaft assembly according to claim 2, characterized in that The rod wall of the positioning rod (10) is provided with connecting threads. The air inlet pipe (8) is an internally threaded pipe. The positioning rod (10) is threadedly arranged inside the air inlet pipe (8).

5. The oil-sealed drive shaft assembly according to claim 2, characterized in that, Inner hexagonal grooves (14) are formed on the sides away from each other of the two clamping plates (11).

6. The oil-sealed drive shaft assembly according to claim 1, characterized in that, The annular plate (5) is fixedly welded to the top of the piston housing (3).

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