CN114811047A - A high-speed wheeled amphibious vehicle drive shaft sealing device - Google Patents

Abstract

The invention discloses a special high-speed wheel type amphibious vehicle driving shaft sealing device, which achieves the aim by combining four sealing rings with different lip forms and two lubricating modes of oil and grease, and adding a special muddy water prevention structure, a dustproof structure and a lubricating oil forced circulation heat dissipation cooling mode, and breaks through the key technology of the high-speed wheel type amphibious vehicle driving shaft sealing. The device can adapt to the complex working condition of vehicle operation, satisfies the sealed requirement and the security requirement that the land and water high speed was gone, has long enough life and is convenient for maintain.

Description

A high-speed wheeled amphibious vehicle drive shaft sealing device

technical field

The invention belongs to the technical field of special vehicle sealing, in particular to a high-speed wheeled amphibious vehicle drive shaft sealing device.

Background technique

High-speed wheeled amphibious vehicles can travel on water and land at high speeds, and can quickly switch between water and land driving modes. Generally, the maximum speed on land is ≥120Km/h, and the maximum speed on water is ≥50Km/h. General vehicles are complex. In order to achieve high-speed driving on the water surface, the wheels are usually lifted by the lifting suspension after the vehicle is launched, and the wheels are hidden inside the bottom surface of the vehicle hull, thereby significantly reducing the water resistance and meeting the high-speed sliding requirements of the vehicle on the water surface.

High-speed wheeled amphibious vehicles have a variety of power transmission configurations, such as wheel reducer drive, wheel motor drive and drive shaft drive. For a wheeled amphibious vehicle driven by a propeller shaft, its power chain (engine/drive motor + transfer case) is located in the dry area of the cabin, the wheels are fixed on the vehicle hull by a liftable suspension, and it is located in the wet area outside the cabin, and the drive shaft passes through The passing hull transfers power torque from the powertrain to the wheels, driving the vehicle. There must be a reliable sealing device between the drive shaft and the hull of the vehicle, which can prevent water leakage from entering the cabin and damage the equipment or cause the vehicle to sink, endangering the safety of personnel and vehicles, and also be able to adapt to the complex working conditions of amphibious operation of the vehicle and meet the requirements of water and land. Sealing requirements and safety requirements for high-speed driving, while having a long enough service life and easy vehicle maintenance.

There are three main driving modes for high-speed wheeled amphibious vehicles: surface driving mode, land driving mode and water-land transition driving mode. When driving at high speed on the water surface, the wheels are stationary and do not rotate, and the drive shaft sealing device needs to withstand high water flow pressure (water depth + high-speed water flow impact) without leakage, so as to ensure the safety of personnel and vehicles; when driving at high speed on land, the high-speed driving shaft Rotation and severe friction with the sealing ring, it is necessary to add lubricant to the contact surface of the sealing ring and the drive shaft to form a lubricating oil film to reduce friction, and take effective cooling measures to dissipate heat and reduce the temperature of the sealing ring caused by friction and high heat. The service life of the device; when the vehicle is in the water-land conversion mode when the vehicle is launched or ashore, the drive shaft is immersed in the water and rotates at a low speed, the water flow has a certain pressure, and the operating environment is also relatively harsh. The sealing device is required to have dynamic sealing performance under a certain pressure, which can prevent Water leakage and sediment intrusion. During the use of the vehicle, the lubricant in the sealing device will be gradually lost and polluted, and it needs to be filled or replaced regularly. The structure of the sealing device should ensure that the process of adding or replacing the lubricant is as simple as possible.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-speed wheeled amphibious vehicle drive shaft sealing device, so as to overcome the above-mentioned defects in the prior art.

In order to achieve the above purpose, the present invention provides an amphibious vehicle drive shaft sealing device, which is used as a sealing link of the amphibious vehicle power transmission mechanism. The power transmission mechanism of the amphibious vehicle driven by the drive shaft is mainly composed of a transfer case, a drive shaft sealing device, a vehicle hull, a ball cage universal joint half shaft and a flexible coupling. The power of the transfer case is transmitted to the ball cage type universal joint axle shaft to drive the wheels to rotate. The drive shaft sealing device passes through the hull of the vehicle, and is screwed and fixed on the outside of the hull, and is rigidly connected with the hull to form a reliable sealing structure to prevent the water flow from leaking into the cabin from the joint surface of the two when driving on the water surface and switching between water and land. . The sealing device is mainly composed of a sealing body, a sealing shaft sleeve, a sealing ring gland, a labyrinth fender ring, a grease homogeneous ring, a centering gland of the sealing body and four sealing rings:

The sealing body is the carrier of the four sealing rings and the sealing gland. It is fixed on the main support flange seat with screws. The centering gland of the sealing body maintains the coaxiality with the main support flange seat through the cooperation of the centering gland of the sealing body to maintain a stable sealing gap. . A cooling lubricating oil circulation channel is opened inside the sealing body, which is communicated with two Z-shaped oil pipes;

The sealing bushing is assembled on the drive shaft by the hot assembly method, and then rotates together; the outer surface of the sealing bushing cooperates with the lips of the four sealing rings to form a sealing pair, which requires high surface roughness and surface hardness. In order to reduce friction, reduce wear and prolong the service life of the device. The labyrinth fender is press-fitted on the drive shaft and rotates with it;

The radial clearance between the inner conical surface of the labyrinth fender and the outer conical surface of the flange of the sealing ring gland is 1.2 to 2 mm, and the axial overlap is 3 to 5 mm, forming a labyrinth sealing structure, which can prevent larger particles from entering the sealing space and prevent hard damage to the seal ring. The conical surface of the outer end of the inner hole of the sealing ring gland flange and the inner conical surface of the labyrinth fender are inclined downward, which is conducive to the discharge of sediment and prevents the deposition of pollutants;

The aliquot ring is located between the second and third sealing rings, and the supporting sealing ring maintains a normal working state;

The outer circles at both ends of the sealing centering gland are respectively matched with the inner circles of the main supporting flange seat and the sealing body.

Preferably, in the above technical solution, the entire device passes through the vehicle hull into the cabin from the outside of the vehicle hull, is supported by the main support flange seat, and is fixed to the outside of the vehicle hull with screws. A main gasket is installed between the main support flange seat and the hull of the vehicle to prevent the water flow from leaking into the cabin from the joint surface of the two. The installation hole of the main support flange seat on the hull of the vehicle has requirements for position and coaxiality to ensure that after the drive shaft sealing device is assembled, the coaxiality deviation between the drive shaft and the output shaft of the transfer case is less than or equal to 0.15mm.

Preferably, in the above technical solution, the drive shaft is relatively fixed in the axial direction with respect to the main support flange seat, and can rotate freely in the radial direction; the drive shaft is supported in the fixing holes of the main support flange seat by two bearings to ensure the drive shaft The two bearings are self-lubricating and self-sealing bearings due to the coaxiality requirement with the output shaft of the transfer case. The outer ring of one of the bearings is fixed on one end of the main support flange seat through the bearing fixing sleeve and the bearing gland, forming a fixed fulcrum of the drive shaft and bearing the axial load of the drive shaft. The outer ring of the other bearing can move axially in the fixed hole of the main support flange seat, which is the moving fulcrum of the drive shaft, which can adapt to the axial dimensional changes caused by temperature changes and improve the operating accuracy of the system. A spacer is installed between the two bearings, which is locked on the drive shaft with a round nut and a stop washer, and the axial direction is relatively fixed.

Preferably, in the above technical solution, the four sealing rings are specifically: a lip-shaped sealing ring, a double-sided oil sealing ring of the skeleton, and two skeleton oil sealing rings arranged oppositely; the lip-shaped sealing ring is the first sealing ring, which is made of wear-resistant synthetic The rubber material has three lips, and the lip and the outer circle of the sealing shaft sleeve adopt a clearance fit of 0.10~0.15mm;

The double-side oil seal ring of the skeleton is the second seal ring with double-side spring compression lips;

The two oppositely arranged skeleton oil seals are the third and fourth seals respectively. The two oppositely arranged skeleton oil seals plus the inner surface of the seal body and the outer surface of the seal sleeve enclose the cooling lubricant storage. And the circulation space, this space communicates with the cooling lubricating oil circulation channel inside the sealing body;

The grease homogeneous ring is located between the oil seals on both sides of the skeleton and the third skeleton oil seal, and the support oil seal maintains a normal working state. Channels for injecting, replacing and distributing grease.

Preferably, in the above technical solution, the grease homogeneous ring, the double-sided oil seal ring of the skeleton, the third skeleton oil seal ring and the outer surface of the sealing shaft sleeve form a grease storage space to provide grease for the sealing pair, reduce friction, reduce wear.

Preferably, in the above technical solution, a grease filling and replacement channel is also opened inside the sealing body, which is communicated with the annular groove of the grease homogeneous ring, and the two screw plugs are used to close the grease filling and replacement channel of the sealing body. Open when filling and changing grease.

Preferably, in the above technical solution, the cooling lubricating oil circulation channel inside the sealing body is connected with the Z-shaped oil pipe, the oil pipe in the cabin, the low pressure oil pump and the high-level oil storage tank outside the sealing body to form a complete cooling lubricating oil circulation channel.

Preferably, in the above technical solution, the labyrinth fender is press-fitted on the drive shaft and rotates with it; the radial clearance between the inner conical surface of the labyrinth fender and the outer conical surface of the flange of the sealing ring gland is 1.2-2 mm. , the axial coincidence 3 ~ 5mm, forming a labyrinth seal structure.

Compared with the prior art, the present invention has the following beneficial effects:

Although high-speed wheeled amphibious vehicles have a wide range of uses in both military and civilian fields, there are no mature mass-marketed models in China, and due to technical blockades, there are no foreign models for reference. The invention breaks through the key technology of sealing the drive shaft of the high-speed wheeled amphibious vehicle, and has the following three remarkable advantages.

1. As mentioned above, the overall technical scheme of the patent of the present invention combines four kinds of sealing rings with different lip forms and two lubrication modes of oil and grease, plus special anti-muddy water, dust-proof structure and forced circulation of lubricating oil to dissipate heat. The cooling method of cooling can adapt to the complex working conditions of wheeled amphibious vehicles, meet the sealing requirements and safety requirements of high-speed driving on water and land, and has a long enough service life and is easy to maintain.

2. The oil and grease dual lubrication mode is used for lubrication and forced circulation cooling. When the vehicle is running at high speed, the low-pressure oil pump is turned on to force the lubricating oil to circulate and cool to reduce the system temperature, which can effectively reduce friction, reduce wear and prolong the service life of the device. The Z-shaped oil pipe (9/10) in the lubricating oil circulation oil circuit has the function of heat dissipation and can reduce the internal stress caused by temperature changes and prevent the leakage of oil pipe joints; the Z-shaped oil pipe (9/10) has a Deformation allowance can avoid the failure of lubrication and cooling function caused by oil pipe breakage.

3. As mentioned above, the present invention adopts a three-cone labyrinth anti-muddy water structure, which can effectively prevent sediment from invading and polluting the sealed space, and ensures that the sealing device can adapt to the complex driving conditions of amphibious vehicles.

Description of drawings

FIG. 1 is a power transmission configuration diagram of a typical propshaft-driven amphibious vehicle, illustrating the relationship between the power transmission path of the vehicle and the drive shaft sealing device;

In the picture: 1. Transfer case, 2. Drive shaft sealing device, 3. Car hull, 4. Ball cage universal joint half shaft, 5. Flexible coupling.

FIG. 2 is a structural diagram of the drive shaft sealing device 2, illustrating the components and their relative positional relationships that constitute the sealing device;

In the picture: 3. Vehicle hull, 6. Low pressure oil pump, 7. High-level oil storage tank, 8/11, oil pipe in cabin, 9/10, Z-shaped oil pipe.

Fig. 3 is a partial enlarged view D of the front view of Fig. 2, illustrating the components and their relative positional relationship constituting the sealing device; the partially enlarged view H illustrates the components constituting the three-cone labyrinth anti-muddy water structure and their relative positional relationship;

In the picture: 3. Vehicle hull, 12. Drive shaft, 13. Labyrinth fender, 14. Sealing ring gland, 15. Sealing body, 16. Main gasket, 17. Main support flange seat, 18. Fixing sleeve Cylinder 18, 19, bearing gland, 20, stop washer, 21, round nut, 22/24, bearing, 23, spacer, 30, lip seal, 31, seal sleeve.

4 is a partial enlarged view G of the cross-sectional view B-B of FIG. 2, illustrating the cross-sectional structure of the four sealing rings and their relative positional relationship; Location;

In the picture: 12, drive shaft, 13, labyrinth fender, 14, sealing ring gland, 24, bearing, 25, sealing body centering gland, 26, skeleton oil seal, 27, skeleton oil seal, 28, skeleton Double-sided oil seal ring, 29, seal ring pressure plate, 30, lip seal, 31, seal shaft sleeve, 32, grease ring.

FIG. 5 is a cross-sectional view C-C of FIG. 2 illustrating the grease storage space between the second and third seal rings, as well as the location of the grease filling and replacement passage and the two blocking plugs.

In the picture: 10, Z-shaped oil pipe, 12, drive shaft, 13, labyrinth fender, 32, aliquot ring, 33/34, screw plug.

FIG. 6 is a schematic diagram of a specific implementation scenario of the present invention.

Detailed ways

The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

Unless expressly stated otherwise, throughout the specification and claims, the term "comprising" or its conjugations such as "comprising" or "comprising" and the like will be understood to include the stated elements or components, and Other elements or other components are not excluded.

1. System review:

Figure 1 is a typical drive shaft driven amphibious vehicle power transmission configuration, consisting of a transfer case 1, a drive shaft sealing device 2, a vehicle hull 3, a ball cage universal joint half shaft 4 and a flexible coupling 5 composition.

The drive shaft sealing device 2 transmits the power of the transfer case 1 to the ball cage universal joint half shaft 4 through the flexible coupling 5 to drive the wheels to rotate.

The drive shaft sealing device 2 passes through the vehicle hull 3, is screwed and fixed on the outside of the vehicle hull 3, and is rigidly connected with the vehicle hull 3 to form a reliable sealing structure to prevent the water flow from seeping through the joint surface of the two when driving on the water surface and switching between water and land. leaked into the cabin.

2. Structure and function description of drive shaft sealing device 2:

Figures 2 to 5 are structural diagrams of the drive shaft sealing device 2. Its structure has five major features, which are described as follows:

2.1. The support and sealing structure of the main body of the device: refer to Fig. 3, partial enlarged view D, the whole device enters the cabin from the outside of the car hull 3 through the car hull 3, is supported by the main supporting flange seat 17, and is fixed on the outside of the car hull 3 with screws . A main gasket 16 is installed between the main support flange seat 17 and the vehicle hull 3 to prevent water flow from leaking into the cabin from the joint surface of the two. The installation holes of the main support flange seat 17 on the vehicle hull 3 have positional and coaxial requirements to ensure that after the drive shaft sealing device 2 is assembled, the coaxial deviation between the drive shaft 12 and the output shaft of the transfer case 1 is ≤ 0.15 mm.

2.2. Drive shaft support and lubricating structure: refer to the partially enlarged view D of Fig. 3, the drive shaft 12 is relatively fixed in the axial direction relative to the main support flange seat 17, and can rotate freely in the radial direction. The drive shaft 12 is supported by the bearing 22 and the bearing 24 in the fixing hole of the main support flange seat 17 to ensure the coaxiality of the drive shaft 12 and the output shaft of the transfer case 1. The bearing 22 and the bearing 24 are self-lubricating and self-sealing. bearing. The outer ring of the bearing 22 is fixed on one end of the main support flange seat 17 through the bearing fixing sleeve 18 and the bearing gland 19 to form a fixed fulcrum of the drive shaft 12 and bear the axial load of the drive shaft 12 . The outer ring of the bearing 24 can move axially in the fixing hole of the main support flange seat 17 and is the fulcrum of the drive shaft 12. A spacer 23 is installed between the bearing 22 and the bearing 24, and is locked on the drive shaft 12 with a round nut 21 and a stop washer 20, and the axial direction is relatively fixed.

2.3. Sealing structure of the drive shaft: refer to the partial enlarged view D of Fig. 3 and the partial enlarged view G of Fig. 4. The seal structure is mainly composed of the seal body 15, the seal shaft sleeve 31, the seal ring gland 14, the labyrinth fender 13, and the grease homogeneous ring. 32. The sealing body is composed of centering gland 25 and four sealing rings (lip-shaped sealing ring 30, skeleton oil seal ring 28, skeleton oil seal ring 27, skeleton oil seal ring 26) and the like.

The sealing body 15 is the carrier of four sealing rings (lip-shaped sealing ring 30, skeleton oil seal ring 28, skeleton oil seal ring 27, skeleton oil seal ring 26) and sealing glands and other parts, which are fixed on the main support flange seat with screws 17, through the cooperation of the centering gland 25 of the sealing body and the main supporting flange seat 17, the coaxiality is maintained, and a stable sealing gap is maintained.

A cooling lubricating oil circulation channel is opened inside the sealing body 15, which communicates with the Z-shaped oil pipe 9/10. Refer to Fig. 2 for the structural diagram of the drive shaft sealing device 2.

The inside of the sealing body 15 is also opened with a grease filling and replacement channel, which communicates with the grease homogeneous ring 32. The screw plug 33 and the screw plug 34 are used to close the grease filling and replacement channel of the sealing body. when open. See FIG. 5 sectional view C-C.

The sealing shaft sleeve 31 is fitted on the drive shaft 12 by means of a heat fitting method, and rotates therewith. The outer circular surface of the sealing shaft sleeve 31 cooperates with the lips of the four sealing rings (lip-shaped sealing ring 30, double-sided oil sealing ring 28, skeleton oil sealing ring 27, skeleton oil sealing ring 26) to form a sealing pair, which is required to have a higher Surface roughness and surface hardness to reduce friction, reduce wear and prolong the service life of the device.

The labyrinth fender 13 is press-fitted on the drive shaft 12 and rotates therewith. The radial clearance between the inner conical surface of the labyrinth fender 13 and the flange outer conical surface of the sealing ring gland 14 is 1.2 to 2 mm, and the axial overlap is 3 to 5 mm, forming a labyrinth sealing structure, which can prevent larger particles from entering the sealing space. Prevent hard objects from damaging the sealing ring. The conical surface of the outer end of the inner hole of the flange of the sealing ring gland 14 and the inner conical surface of the labyrinth fender ring 13 are inclined downward, which is conducive to discharging sediment and preventing the deposition of pollutants. See Figure 3 for a partial enlarged view.

The aliquot ring 32 is located between the oil seal rings 28 on both sides of the skeleton and the oil seal ring 27 of the skeleton, and the support oil seal rings maintain a normal working state. The grease homogeneous ring 32, the oil seal ring 28 on both sides of the skeleton, the oil seal ring 27 of the skeleton and the outer surface of the sealing shaft sleeve 31 form a grease storage space, which provides grease for the sealing pair, reduces friction and reduces wear. The grease homogeneous ring 32 has 6 to 8 grease homogeneous holes evenly distributed radially, and communicates with the annular groove on its outer circumference, and the annular groove communicates with the grease filling and replacement channel inside the sealing body 15 to obtain necessary grease. See Figure 5, Section View C-C, Section View C-C.

The outer circles at both ends of the sealing and centering gland 25 are matched with the inner circles of the main support flange seat 17 and the sealing body 15 respectively, so as to maintain the necessary coaxiality between the sealing body 15 and the drive shaft 12 and maintain a stable sealing gap.

The lip sealing ring 30 is the first sealing ring, which is made of wear-resistant synthetic rubber and has three lips, and the two outward lips have the function of blocking and pumping out the particles on the outside. The lip and the outer circle of the sealing shaft sleeve 31 adopt a clearance fit of 0.10-0.15 mm, and the main function is to prevent sediment and dust from entering the sealing cavity.

The oil seal ring 28 on both sides of the skeleton is the second seal ring. It has a double-sided spring pressing lip and can withstand a pressure of 0.03MPa. The outer lip prevents the water flow from leaking into the sealing cavity, and the inner lip prevents the grease from leaking out. leak.

The skeleton oil seal ring 27 and the skeleton oil seal ring 26 are the third and fourth seal rings, respectively, which are arranged relative to each other and can withstand a pressure of 0.03 MPa. These two plus the inner circular surface of the sealing body 15 and the outer circular surface of the sealing shaft sleeve 31 enclose a cooling oil storage and circulation space, which is communicated with the cooling oil circulation channel inside the sealing body 15, and circulates in it. The lubricating oil has the functions of lubricating and cooling. Refer to Fig. 2 Structure diagram of drive shaft sealing device 2, Sectionview B-B.

2.4. Sealing lubrication and cooling and heat dissipation structure: refer to Figure 5, Section View C-C, Section View C-C, Figure 4, Partial Enlarged View G, and Figure 2, the structural diagram of the drive shaft sealing device 2.

The grease homogeneous ring 32 in the sealing chamber, the oil seal ring 28 on both sides of the skeleton, the oil seal ring 27 of the skeleton and the outer surface of the sealing shaft sleeve 31 form a grease storage space, which provides grease for the sealing pair, reduces friction and wear. and frictional heat. The annular groove on the outer circumference of the grease homogeneous ring 32 communicates with the grease filling and replacement channel inside the sealing body 15 , and the grease filling or replacement is carried out through the screw plug 33 and the screw plug 34 , which facilitates the maintenance and repair of the vehicle. The above structure provides a grease lubrication mode for this sealing device.

The skeleton oil seal ring 27 and the skeleton oil seal ring 26 can withstand the pressure of 0.03MPa, the two are arranged oppositely, and the inner surface of the sealing body 15 and the outer surface of the sealing sleeve 31 are enclosed to form a cooling lubricant storage and circulation space , this space is communicated with the cooling lubricating oil circulation channel inside the sealing body 15 , and the lubricating oil therein has the functions of lubricating, cooling and dissipating heat. The cooling lubricating oil circulation channel inside the sealing body 15 is connected with its external Z-shaped oil pipes 9/10, cabin oil pipes 8/11, low-pressure oil pump 6 and high-level oil storage tank 7, forming a complete cooling lubricating oil circulation channel. When the vehicle is running at high speed, the low-pressure oil pump 6 runs, and the lubricating oil in the device is forced to circulate, taking away the heat generated by the friction of the sealing pair, reducing the temperature in the device, slowing down the wear of the sealing ring, and prolonging the service life of the device. The above structure provides the oil lubricating mode and the lubricating oil forced circulation cooling mode for the sealing device.

After the vehicle runs for a long time, the oil seal ring 28 on both sides of the outer frame will first wear and leak due to the erosion of mud and water. At this time, the oil seal ring 27 of the third sealing ring frame will play the function of the backup sealing ring, which prolongs the service life of the device. , which improves the safety margin of the device.

The oil pressure generated by the high-level oil storage tank 7 in the cooling lubricating oil circulation space can balance the external water pressure, reduce the deformation of the sealing ring, and reduce the leakage of water flow.

2.5 Three-cone labyrinth mud and water-proof structure: see the enlarged view of Fig. 3, the labyrinth mud fender 13 is press-fitted on the drive shaft 12 and rotates with it. The radial clearance between the inner conical surface of the labyrinth fender 13 and the flange outer conical surface of the sealing ring gland 14 is 1.2 to 2 mm, and the axial overlap is 3 to 5 mm, forming a labyrinth sealing structure, which can prevent larger particles from entering the sealing space. Prevent hard objects from damaging the sealing ring. The conical surface of the outer end of the inner hole of the flange of the sealing ring gland 14 and the inner conical surface of the labyrinth fender ring 13 are inclined downward, which is conducive to discharging sediment and preventing the deposition of pollutants. The above three-cone labyrinth structure can effectively prevent sediment from invading and polluting the sealed space, and ensures that the sealing device can adapt to the complex driving conditions of the amphibious vehicle.

3 Effects of invention:

Although high-speed wheeled amphibious vehicles have a wide range of uses in both military and civilian fields, there are no mature mass-marketed models in China, and due to technical blockades, there are no foreign models for reference. The invention breaks through the key technology of sealing the drive shaft of the high-speed wheeled amphibious vehicle, and has the following three remarkable advantages.

3.1 As mentioned in the aforementioned "Content of the Invention", the overall technical solution of the patent of the present invention combines four types of sealing rings with different lip forms and two lubrication modes of oil and grease, plus special anti-muddy water, dust-proof structure and lubricating oil. The cooling method of forced circulation heat dissipation and cooling can adapt to the complex working conditions of wheeled amphibious vehicles, meet the sealing requirements and safety requirements of high-speed driving on water and land, and has a long enough service life and is easy to maintain.

3.2 The oil and grease dual lubrication mode and the forced circulation cooling method of lubricating oil are adopted. When the vehicle is running at high speed, the low-pressure oil pump is turned on to force the lubricating oil to circulate and cool to reduce the system temperature, which can effectively reduce friction, reduce wear and prolong the service life of the device . The Z-shaped oil pipe 9/10 in the lubricating oil circulation oil circuit has the function of heat dissipation and can reduce the internal stress caused by temperature changes, preventing the leakage of oil pipe joints; when subjected to external extrusion and impact, the Z-shaped oil pipe 9/10 has a deformation allowance , which can avoid the failure of lubrication and cooling functions caused by the rupture of the oil pipe; the oil seal ring 27 of the third sealing ring skeleton has the function of a backup sealing ring, which prolongs the service life of the device and improves the safety margin of the device.

3.3 As described in "Beneficial Effect" 3 of the aforementioned "Summary of the Invention", the present invention adopts a three-cone labyrinth anti-muddy water structure, which can effectively prevent sediment from invading and depositing pollution to the sealed space, and ensures that the sealing device can adapt to the complex driving work of amphibious vehicles. condition.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise form disclosed, and obviously many changes and modifications are possible in light of the above teachings. The exemplary embodiments were chosen and described for the purpose of explaining certain principles of the invention and their practical applications, to thereby enable those skilled in the art to make and utilize various exemplary embodiments and various different aspects of the invention. Choose and change. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims (8)

1. The utility model provides a high-speed wheeled amphibious vehicle drive shaft sealing device, transmission shaft driven amphibious vehicle power transmission mechanism mainly comprises transfer case (1), drive shaft sealing device (2), the car hull (3), rzeppa universal joint semi-axis (4) and flexible coupling (5), its characterized in that: the power of the transfer case (1) is transmitted to a ball-cage type universal joint half shaft (4) by the driving shaft sealing device (2) through a flexible coupling (5) to drive wheels to rotate, and the driving shaft sealing device (2) penetrates through the vehicle hull (3) and is fixed on the outer side of the vehicle hull (3) in a threaded manner and is rigidly connected with the vehicle hull (3) to form a reliable sealing structure; the sealing device mainly comprises a sealing main body (15), a sealing shaft sleeve (31), a sealing ring gland (14), a labyrinth mud ring (13), an even-ring (32), a sealing main body centering gland (25) and four sealing rings;

the sealing main body (15) is a carrier of four sealing rings and sealing glands, is fixed on the main supporting flange seat (17) by screws, keeps coaxiality with the main supporting flange seat (17) through the matching of the centering gland (25) of the sealing main body, and is internally provided with a cooling lubricating oil circulating channel which is communicated with the two Z-shaped oil pipes (9 and 10);

the sealing shaft sleeve (31) is assembled on the driving shaft (12) in an interference fit mode by a hot assembly method and rotates along with the driving shaft; the outer circle surface of the sealing shaft sleeve (31) is matched with the lips of the four sealing rings to form a sealing pair, and the labyrinth mud-guard ring (13) is pressed on the driving shaft (12) and rotates along with the driving shaft;

the radial clearance between the inner conical surface of the labyrinth mud-blocking ring (13) and the outer conical surface of the flange of the sealing ring gland (14) is 1.2-2 mm, the axial coincidence is 3-5 mm, a labyrinth sealing structure is formed, and the conical surface of the outer end of the inner bore of the flange of the sealing ring gland (14) and the inner conical surface of the labyrinth mud-blocking ring (13) are both inclined downwards;

the grease equalizing ring (32) is positioned between the second sealing ring and the third sealing ring, the supporting sealing ring keeps a normal working state, and an annular groove on the periphery of the grease equalizing ring is communicated with 6-8 grease equalizing holes which are uniformly distributed in the radial direction and used as a channel for filling, replacing and uniformly distributing lubricating grease;

the outer circles of two ends of the sealing centering gland (25) are respectively matched with the inner circles of the main supporting flange seat (17) and the sealing main body (15).

2. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 1, characterised in that: the whole device passes through the vehicle body (3) from the outer side of the vehicle body (3) to enter the cabin, is supported by the main supporting flange seat (17), and is fixed at the outer side of the vehicle body (3) by screws; a main sealing gasket (16) is additionally arranged between the main supporting flange seat (17) and the vehicle hull (3), and the mounting hole of the main supporting flange seat (17) on the vehicle hull (3) has position degree and coaxiality requirements so as to ensure that the coaxiality deviation of the driving shaft (12) and the output shaft of the transfer case (1) is less than or equal to 0.15 mm.

3. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 2, characterised in that: the driving shaft (12) is axially fixed relative to the main supporting flange seat (17) and can freely rotate in the radial direction; the driving shaft (12) is supported in a fixing hole of the main support flange seat (17) by a bearing (22) and a bearing (24), and the bearing (22) and the bearing (24) are self-lubricating self-sealing bearings; the outer ring of the bearing (22) is fixed at one end of the main supporting flange seat (17) through a bearing fixing sleeve (18) and a bearing gland (19) to form a fixed fulcrum of the driving shaft (12) and bear the axial load of the driving shaft (12); the outer ring of the bearing (24) can axially move in a fixed hole of the main support flange seat (17) and is a moving fulcrum of the driving shaft (12), a spacer bush (23) is additionally arranged between the bearing (22) and the bearing (24), and the bearing is locked on the driving shaft (12) by a round nut (21) and a stop washer (20) and axially fixed relatively.

4. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 1, characterised in that: the four sealing rings are specifically as follows: the oil seal structure comprises a lip-shaped sealing ring (30), a framework double-side oil seal ring (28), a framework oil seal ring (27) and a framework oil seal ring (26); the lip-shaped sealing ring (30) is a first sealing ring, is made of wear-resistant synthetic rubber materials and is provided with 3 lips, and the lips of the lip-shaped sealing ring are in clearance fit with the excircle of the sealing shaft sleeve (31) by 0.10-0.15 mm; the framework double-side oil seal ring (28) is a second seal ring and is provided with double-side spring pressing lips; the framework oil seal ring (27) and the framework oil seal ring (26) are respectively a third sealing ring and a fourth sealing ring, the framework oil seal ring (27) and the framework oil seal ring (26) which are arranged in opposite directions, the inner circular surface of the sealing main body (15) and the outer circular surface of the sealing shaft sleeve (31) enclose a cooling lubricating oil storage and circulation space, and the space is communicated with a cooling lubricating oil circulation channel in the sealing main body (15); the oil seal ring (32) is located between the framework oil seal rings (28) on the two sides of the framework and the framework oil seal ring (27), the support oil seal ring keeps a normal working state, and annular grooves in the periphery of the support oil seal ring are communicated with 6-8 grease equalizing holes which are uniformly distributed in the radial direction and serve as channels for filling, replacing and uniformly distributing lubricating grease.

5. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 4, characterised in that: the outer circle surfaces of the uniform alicyclic ring (32), the framework double-side oil seal ring (28), the framework oil seal ring (27) and the sealing shaft sleeve (31) enclose a lubricating grease storage space to provide lubricating grease for the sealing pair.

6. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 1, characterised in that: the interior of the sealing main body (15) is also provided with a lubricating grease filling and replacing channel which is communicated with the annular groove of the uniform ring (32), and the screw plug (33) and the screw plug (34) are used for closing the lubricating grease filling and replacing channel and are opened when lubricating grease is filled and replaced.

7. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 4, characterised in that: and a cooling lubricating oil circulation channel in the sealing main body (15) is connected with Z-shaped oil pipes (9, 10), cabin oil pipes (8, 11), a low-pressure oil pump (6) and a high-level oil storage tank (7) outside the sealing main body to form a complete cooling lubricating oil circulation passage.

8. A high-speed wheeled amphibious vehicle drive shaft sealing device according to claim 1, characterised in that: the labyrinth mud guard ring (13) is pressed on the driving shaft (12) and rotates along with the driving shaft; the radial clearance between the inner conical surface of the labyrinth mud-guard ring (13) and the outer conical surface of the flange of the sealing ring gland (14) is 1.2-2 mm, the axial direction is overlapped for 3-5 mm, and a labyrinth sealing structure is formed.

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