A high airtight transmission shaft

Abstract

The invention discloses a high-airtightness transmission shaft, which belongs to the field of transmission shafts, and comprises a first ten-bit, a spline shaft, a spline sleeve, a twentieth bit, a sealing cover, a dustproof device, a vent plug, a telescopic airbag and a sealing cover, wherein the interior of the spline shaft is arranged as a hollow structure. By arranging a dustproof sleeve, a first skeleton oil seal and a second skeleton oil seal, it is ensured that external water vapor, dust and the like cannot enter, and in view of the fundamental problem that the volume of its internal space changes during telescoping and the internal air pressure cannot be balanced with the outside, a set of structures with good sealing effect, internal closure and adjustable volume is used to achieve the purpose of completely sealing the spline space and maintaining its air pressure balance, thereby ensuring that external water vapor cannot enter, eradicating the problem of spline corrosion, having good sealing effect and light weight, and effectively reducing the problem of water vapor corrosion of the spline.

Description

Technical Field

[0001] The invention relates to the field of transmission shafts, and in particular to a high-air-tightness transmission shaft. Background Art

[0002] The existing transmission shaft spline telescopic part is a common closed dustproof structure. When it is telescopic, its internal space changes, and the internal air pressure cannot be balanced with the outside. Because the volume of the internal space changes during telescopic, the internal air pressure cannot be balanced with the outside, resulting in failure to ensure true sealing. When it is stretched, the internal air pressure decreases, causing external water vapor to enter, or after a long period of work, the internal air pressure increases and the air is discharged. After cooling, the pressure is low and water vapor is inhaled, causing corrosion on the spline surface, making it difficult for the spline to telescope, and then causing excessive axial tension on the rotating parts at both ends, damaging the rotating parts. Summary of the invention

[0003] The purpose of the present invention is to provide a high-airtightness transmission shaft to solve the technical problem that the existing telescopic transmission shaft changes in volume during the telescopic process, causing water vapor to enter and cause corrosion on the spline surface after the internal pressure is reduced. In view of the fundamental problem that the volume of the internal space changes during telescopic operation and the internal air pressure cannot be balanced with the outside, a set of structures with good sealing effect, internal closure and adjustable volume is used to achieve the purpose of completely sealing the spline space and maintaining its air pressure balance, thereby ensuring that external water vapor cannot enter and eradicating the problem of spline corrosion.

[0004] A high-airtightness transmission shaft comprises a first delimiter, a spline shaft, a spline sleeve, a twentieth delimiter, a sealing cover, a dustproof device, a vent plug, a telescopic airbag and a sealing cover, wherein the interior of the spline shaft is arranged as a hollow structure, the first delimiter is arranged at one end of the spline shaft, one end of the spline sleeve is sleeved on the outside of the spline shaft, the twentieth delimiter is arranged at the other end of the spline sleeve, the dustproof device is arranged on the outside of the spline sleeve and the spline shaft sleeve, the sealing cover is arranged on the inner side of the end of the spline sleeve, the vent plug is arranged on the spline shaft, the sealing cover is arranged on the inner side of the end of the vent plug, the telescopic airbag is sealed and connected with the sealing cover, and is arranged in the spline shaft, and the interior of the telescopic airbag is communicated with the interior of the spline sleeve.

[0005] Furthermore, the dustproof device includes a dustproof sleeve, a first skeleton oil seal and a second skeleton oil seal. The dustproof sleeve is sleeved on the outer side of the spline shaft and a cavity is provided with the outer side wall of the spline shaft. One end of the dustproof sleeve is fixed on the outer side of the spline shaft. The first skeleton oil seal and the second skeleton oil seal are provided on the inner side of one end of the dustproof sleeve and are provided in contact with the outer side of the spline sleeve. The first skeleton oil seal is an inner sealing installation setting, and the second skeleton oil seal is an outer sealing installation setting.

[0006] Furthermore, the dust cover is provided with a grease nipple, the grease nipple connects the external space with the internal cavity of the dust cover, and the grease nipple is provided with a plastic glue nozzle, which is blocked on the grease nipple.

[0007] Furthermore, a sealing ring is provided on the inner side of the sealing cover and the spline shaft, and the sealing ring is configured as a "U"-shaped sealing ring.

[0008] Furthermore, the inner diameters of the first skeleton oil seal and the second skeleton oil seal are sealed with the outer diameter of the spline sleeve and can be freely slid along the axial direction. The spline section end of the spline shaft is provided with a mounting hole, and a sealing cover and a sealing ring are installed in the mounting hole.

[0009] The present invention adopts the above technical solution, and the present invention has the following technical effects:

[0010] The present invention provides a dust cover, a first skeleton oil seal and a second skeleton oil seal to ensure that external water vapor, dust and the like cannot enter. In order to address the fundamental problem that the volume of the internal space changes during expansion and contraction and the internal air pressure cannot be balanced with the external environment, a set of structures with good sealing effect, internal closure and adjustable volume is used to achieve the purpose of completely sealing the spline space and maintaining its air pressure balance, thereby ensuring that external water vapor cannot enter, eradicating the problem of spline corrosion, having good sealing effect, improving sealing performance, being light in weight, and effectively reducing the problem of spline corrosion caused by water vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the present invention.

[0012] Figure 2 This is an enlarged cross-sectional view of the present invention.

[0013] Figure 3 for Figure 2 Enlarged view of point A.

[0014] Numbers in the figure: 1, the first byte; 21, the spline shaft; 22, the spline sleeve; 3, the twentieth byte; 4, the sealing cover; 51, the dust cover; 52, the first skeleton oil seal; 53, the second skeleton oil seal; 6, the grease nipple; 7, the breathable plug; 8, the telescopic airbag; 9, the sealing cover; 10, the sealing ring. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clear, preferred embodiments are given to further describe the present invention in detail. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0016] A high airtight transmission shaft, such as Figure 1-3As shown, the application scope is a transmission shaft with a telescopic structure. The high airtightness transmission shaft includes a first decimal 1, a spline shaft 21, a spline sleeve 22, a twentieth decimal 3, a sealing cover 4, a dustproof device, a vent plug 7, a telescopic airbag 8 and a sealing cover 9, the interior of the spline shaft 21 is set as a hollow structure, the first decimal 1 is set at one end of the spline shaft 21, one end of the spline sleeve 22 is sleeved on the outside of the spline shaft 21, the twentieth decimal 3 is set at the other end of the spline sleeve 22, the dustproof device is set on the outside of the spline sleeve 22 and the spline shaft 21, the sealing cover 4 is set on the inner side of the end of the spline sleeve 22, the vent plug 7 is set on the spline shaft 21, the sealing cover 9 is set on the inner side of the end of the vent plug 7, the telescopic airbag 8 is sealed and connected with the sealing cover 9, and is set in the spline shaft 21, and the interior of the telescopic airbag 8 is connected with the interior of the spline sleeve 22.

[0017] The dustproof device ensures that external water vapor, dust, etc. cannot enter the spline shaft 21 and the spline sleeve 22. In order to address the fundamental problem that the volume of the internal space changes during extension and contraction, and the internal air pressure cannot be balanced with the outside world, a set of structures with good sealing effect, internal closure and adjustable volume is used to achieve the purpose of completely sealing the spline space and maintaining its air pressure balance, thereby ensuring that external water vapor cannot enter and eradicating the problem of spline corrosion.

[0018] In this embodiment, the dustproof device includes a dustproof sleeve 51, a first skeleton oil seal 52 and a second skeleton oil seal 53. The dustproof sleeve 51 is sleeved on the outer side of the spline shaft 21 and a cavity is provided with the outer side wall of the spline shaft 21. One end of the dustproof sleeve 51 is fixed on the outer side of the spline shaft 21. The first skeleton oil seal 52 and the second skeleton oil seal 53 are provided on the inner side of one end of the dustproof sleeve 51 and are provided in contact with the outer side of the spline sleeve 22. The first skeleton oil seal 52 is an inner sealing installation setting, and the second skeleton oil seal 53 is an outer sealing installation setting.

[0019] In this embodiment, a grease nipple 6 is provided on the dust cover 51 , and the grease nipple 6 connects the external space with the internal cavity of the dust cover 51 . The grease nipple 6 is provided with a plastic nozzle, and the plastic nozzle is blocked on the grease nipple 6 .

[0020] In this embodiment, a sealing ring 10 is provided on the inner side of the sealing cover 9 and the spline shaft 21 , and the sealing ring 10 is configured as a “U”-shaped sealing ring.

[0021] In this embodiment, the inner diameters of the first skeleton oil seal 52 and the second skeleton oil seal 53 are sealed with the outer diameter of the spline sleeve 22 and can be freely slid along the axial direction. The end of the spline section of the spline shaft 21 is provided with a mounting hole, and a sealing cover 9 and a sealing ring 10 are installed in the mounting hole.

[0022] A dust cover 51 and two reversely mounted skeleton oil seals 52 and 53 are provided on the outside of the spline pair. The spline pair includes a spline shaft 21 and a spline sleeve 22. The skeleton oil seal 52 is installed as an internal seal to ensure that the internal lubricating oil cannot leak out, and the skeleton oil seal 53 is installed as an external seal to ensure that external water vapor, dust, etc. cannot enter; the inner diameter of the skeleton oil seals 52 and 53 is sealed with the outer diameter of the spline sleeve 22 and can slide freely along the axial direction, and a grease nipple 6 is provided on the dust cover for filling lubricating oil; a sealing cover 4 is provided at the end of the spline sleeve 22; a hollow structure is provided on the spline shaft 21, and a mounting hole is provided at the end of the spline section thereof, and a sealing cover 9 and a sealing ring 10 are installed in the mounting hole, through holes are provided at both ends of the sealing cover 9, and a telescopic airbag 8 is provided in the spline shaft, and the telescopic airbag 8 and the sealing cover 9 are sealed.

[0023] A small hole is opened at the other end of the spline shaft 21, and a vent plug 7 is installed. When the spline shaft 21 is extended, the internal space becomes larger, the air pressure decreases, and the outside air enters the spline shaft hole through the vent plug 7. Then, when the spline shaft 21 is shortened, the telescopic airbag 8 is compressed, and the air in the telescopic airbag 8 is pressed into the spline sleeve 22 until the air pressure inside and outside the telescopic airbag 8 is equal; conversely, when the spline shaft 21 is shortened, the volume inside the spline sleeve 22 is reduced, the air pressure increases, and the air is pressed into the telescopic airbag 8, and the telescopic airbag 8 expands, forcing the air in the spline shaft hole to be discharged into the outside atmosphere through the vent plug 7, and maintaining the air pressure inside and outside the telescopic airbag 8 equal. The whole process always keeps the spline space isolated from the outside to prevent water vapor from entering, which can effectively solve the problem of spline surface corrosion.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high airtight transmission shaft, characterized in that: The invention comprises a first digit (1), a spline shaft (21), a spline sleeve (22), a twentieth digit (3), a sealing cover (4), a dustproof device, a vent plug (7), a telescopic airbag (8) and a sealing cover (9), wherein the interior of the spline shaft (21) is arranged as a hollow structure, the first digit (1) is arranged at one end of the spline shaft (21), one end of the spline sleeve (22) is sleeved on the outside of the spline shaft (21), and the twentieth digit (3) is arranged at the other end of the spline sleeve (22). At one end, the dustproof device is arranged on the outside of the sleeve portion where the spline sleeve (22) and the spline shaft (21) are sleeved, the sealing cover (4) is arranged on the inside of the end of the spline sleeve (22), the vent plug (7) is arranged on the spline shaft (21), the sealing cover (9) is arranged on the inside of the end of the vent plug (7), the telescopic airbag (8) is sealedly connected to the sealing cover (9) and is arranged in the spline shaft (21), and the interior of the telescopic airbag (8) is in communication with the interior of the spline sleeve (22); The dustproof device comprises a dustproof sleeve (51), a first skeleton oil seal (52) and a second skeleton oil seal (53); the dustproof sleeve (51) is sleeved on the outer side of the spline shaft (21) and a cavity is provided with the outer side wall of the spline shaft (21); one end of the dustproof sleeve (51) is fixed on the outer side of the spline shaft (21); the first skeleton oil seal (52) and the second skeleton oil seal (53) are provided on the inner side of one end of the dustproof sleeve (51) and are provided in contact with the outer side of the spline sleeve (22); the first skeleton oil seal (52) is provided as an inner seal, and the second skeleton oil seal (53) is provided as an outer seal; The dust cover (51) is provided with a grease nipple (6), the grease nipple (6) connects the external space with the internal cavity of the dust cover (51), and the grease nipple (6) is provided with a plastic nozzle, which is blocked on the grease nipple (6); A sealing ring (10) is provided on the inner side of the sealing cover (9) and the spline shaft (21), and the sealing ring (10) is configured as a "U"-shaped sealing ring; The inner diameters of the first skeleton oil seal (52) and the second skeleton oil seal (53) are in sealing fit with the outer diameter of the spline sleeve (22) and can be freely slidably arranged along the axial direction; the end of the spline section of the spline shaft (21) is provided with a mounting hole, and a sealing cover (9) and a sealing ring (10) are installed in the mounting hole; Through holes are provided at both ends of the sealing cover (9).

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