CN207111896U - MPV axle gear box sealing structure - Google Patents

Abstract

The utility model discloses a sealing structure for an axle gear box of a multifunctional vehicle, which comprises a shaft sealing device arranged in the shaft hole of the side wall of the axle gear box for supporting a bevel gear shaft; The bearing sleeve cup in the shaft hole, the four-point contact ball bearing and cylindrical roller bearing arranged in the bearing sleeve cup, and the bearing end cover fixed on the side wall of the axle gearbox for axial positioning, the bearing An adjusting ring is arranged between the end cover and the four-point contact ball bearing. The utility model has the advantage that the sealing structure has the first, second and third radial oil inlet holes and the first and second oil collecting grooves, so the amount of lubricating oil of the bearing can be fully satisfied; the high-speed operation of the multifunctional vehicle is realized Double-sided sealing of the rotating through part under the double-mode working condition of low-speed operation and low-speed operation, and the structure is simple, easy to disassemble and maintain, and the sealing effect is reliable.

Description

Sealing Structure of Axle Gearbox of Multipurpose Vehicle

technical field

The utility model relates to a multifunctional vehicle for overhauling, maintaining and repairing contact nets of electrified railways and high-speed passenger dedicated lines, in particular to a sealing structure for an axle gear box of a multifunctional vehicle.

Background technique

The multifunctional vehicle is an operating vehicle for the inspection, maintenance and emergency repair of the catenary of electrified railways and high-speed passenger dedicated lines. Multi-purpose vehicles require a dual-mode traction system for high-speed operation and low-speed operation, especially the axle gearbox in the traction system. At present, there is no mature product, technology and manufacturing experience in China. Functional car axle gearbox. In order to improve the service life of the gearbox, the transmission reliability, the convenience of overhaul, disassembly and maintenance, and to meet the dual-mode working conditions of high-speed operation and low-speed operation of the multi-purpose vehicle, the seal of the axle gearbox is the key and difficult point in the development. This is because: 1. Oil is generally used to lubricate the rotating parts of the gear box of the multi-purpose vehicle axle. Once the lubricating oil of the gear box leaks, it will affect the service life of important parts such as gears and bearings in the box, and may also cause damage along the track. environmental pollution. 2. The multi-purpose vehicle axle gearbox is installed on the bogie at the lower part of the multi-purpose vehicle. When the vehicle is running, due to the uneven distribution of the internal and external pressure of the gearbox, when the external pressure of the gearbox is greater than the internal pressure of the gearbox, it will cause Air, rain, snow, dust and other sundries in the external environment invade the gearbox and pollute the lubricating oil, resulting in frequent emulsification of the lubricating oil, which intensifies the wear of important parts such as bearings and gears in the gearbox.

Therefore, when designing the sealing structure of the gearbox, it is necessary not only to ensure that the lubricating oil in the gearbox cannot leak out, but also to ensure that the air, rain, snow, dust and other sundries outside the gearbox cannot invade the interior of the gearbox, that is, It is required that the sealing structure of the gearbox can realize double-sided sealing.

Contents of the invention

The purpose of the utility model is to provide a sealing structure for the axle gear box of a multifunctional vehicle.

In order to achieve the above object, the utility model takes the following technical solutions:

The sealing structure of the axle gear box of a multifunctional vehicle according to the utility model includes a shaft sealing device arranged in the shaft hole of the side wall of the axle gear box for supporting the bevel gear shaft; The bearing sleeve cup in the hole, the four-point contact ball bearing and cylindrical roller bearing arranged in the bearing sleeve cup, and the bearing end cover fixed on the side wall of the axle gearbox for axial positioning, the bearing end An adjusting ring is arranged between the cover and the four-point contact ball bearing;

The sleeve wall of the bearing sleeve is provided with a first radial oil inlet hole, a second radial oil inlet hole, a third radial radial oil inlet hole, an axial oil inlet hole and the inner cavity of the axle gear box. The oil return hole, the first radial oil inlet hole, the second radial oil inlet hole and the third radial oil inlet hole respectively communicate with the axial oil inlet hole; the wall of the bearing sleeve cup is also provided with a ring The annular groove corresponds to the second radial oil inlet hole and the oil inlet of the axle gear box; the end of the bearing sleeve cup located in the axle gear box is provided with an oil retaining flange, and the oil retaining flange is connected to the oil retaining flange A first oil sump is formed between the cylindrical roller bearings;

The inner peripheral surface of the shaft hole of the bearing end cover is provided with a first sealing flange of the end cover, a second sealing flange of the end cover and a third sealing flange of the end cover along the axial interval, and the third sealing flange of the end cover The second oil collecting groove is formed between the adjustment ring and the four-point contact ball bearing; the outer end surface of the bearing end cover is radially spaced with the fourth sealing flange of the end cover, the fifth sealing flange of the end cover and the sixth sealing flange of the end cover. Sealing flange; the first labyrinth sealing groove is formed between the fourth sealing flange of the end cover and the fifth sealing flange of the end cover, and the second labyrinth sealing groove is formed between the fifth sealing flange of the end cover and the sixth sealing flange of the end cover. Labyrinth seal groove; the bearing end cover is provided with a first axial oil return hole, a second axial oil return hole and a radial oil return hole, and the radial oil return hole is connected to the first axial oil return hole and the radial oil return hole. The second axial oil return holes communicate with each other, and the second axial oil return holes communicate with the oil return holes on the bearing sleeve; at least one set of oil inlet grooves are also provided on the bearing end cover, and the oil inlet grooves are respectively Corresponding to the third radial oil inlet hole of the bearing sleeve;

A sealing ring is set in the shaft hole of the bearing end cover, and the inner ring surface of the sealing ring is provided with a first sealing flange of the sealing ring, a second sealing flange of the sealing ring, a third sealing flange of the sealing ring and a sealing ring. The fourth sealing flange of the ring; the third sealing flange of the end cover corresponds to the fourth sealing flange of the sealing ring and forms a first radial sealing gap, and the second sealing flange of the end cover and the sealing ring The third sealing flange of the ring corresponds to and forms a second radial sealing gap, and the first sealing flange of the end cover corresponds to the second sealing flange of the sealing ring and forms a third radial sealing gap; A first annular sealing cavity is formed between the second sealing flange of the cover, the third sealing flange of the end cap, the third sealing flange of the sealing ring, and the fourth sealing flange of the sealing ring; the second sealing flange of the end cap, A second annular sealing cavity is formed between the first sealing flange of the end cover and the second sealing flange of the sealing ring; between the first sealing flange of the sealing ring, the second sealing flange of the sealing ring and the first sealing flange of the end cover A third annular sealing chamber is enclosed; the bottoms of the first annular sealing chamber and the second annular sealing chamber communicate with the first axial oil return hole of the bearing end cover.

The shaft sealing device also includes a tapered shaft flange, which is sleeved on the bevel gear shaft located outside the sealing ring; A ring platform, a labyrinth ring is set inside the ring platform, and the labyrinth ring is located on the side wall of the bearing end cover and is provided with a first sealing flange of the labyrinth ring and a second sealing protrusion of the labyrinth ring from bottom to top in the radial direction. The third labyrinth seal groove is formed between the first sealing flange of the labyrinth ring and the second sealing flange of the labyrinth ring, and the lower surface of the first sealing flange of the labyrinth ring is provided with radial protrusions; the taper shaft method A fourth labyrinth sealing groove is formed between the flange and the second sealing flange of the labyrinth ring and the first sealing flange of the sealing ring.

The sixth seal flange of the end cover of the bearing end cover extends into the fourth labyrinth seal groove, while the fifth seal flange of the end cover of the bearing end cover extends into the third labyrinth seal groove of the labyrinth ring, The first sealing flange of the labyrinth ring extends into the first labyrinth sealing groove of the bearing end cover, and the second sealing flange of the labyrinth ring extends into the second labyrinth sealing groove of the bearing end cover to form a labyrinth seal together.

A first O-shaped sealing ring is provided between the bearing sleeve cup and the bearing end cover, and a second O-shaped sealing ring is provided between the oil return hole of the bearing sleeve cup and the axial oil return hole of the bearing end cover (4). As for the sealing ring, a third O-shaped sealing ring is arranged between the bearing sleeve cup and the side wall of the axle gearbox.

The diameters of the first radial sealing gap, the second radial sealing gap and the third radial sealing gap are sequentially increased to form a stepped sealing structure.

The utility model has the advantage that the sealing structure has the first, second, and third radial oil inlet holes and the first and second oil collecting grooves, so the lubricating oil quantity of the bearing can be fully satisfied. Since the bearing end cover and the sealing ring have radial protrusions, the first, second, and third radial sealing gaps and the first, second, and third annular sealing chambers formed between the opposing flanges effectively seal the internal The overflowing oil is gradually throttled and decompressed, and the oil flows along the cavity wall to the bottom of the annular sealing cavity, and flows back to the inside of the box through the oil return hole to realize the circulation of lubricating oil in the gearbox. Through the gradual throttling, decompression and backflow from the inside to the outside, the oil mist pressure is gradually reduced to the minimum, which increases the difficulty of oil mist leakage and improves the sealing effect. Since the bearing end cover and the labyrinth ring have axial protrusions, the first, second, and third labyrinth seal grooves formed between the opposite flanges and the flanges together form an axial labyrinth seal, which effectively prevents the casing from External air, rain, snow, dust and other debris enter the inside of the box; O-rings are set between the static sealing parts of the sealing structure to effectively prevent lubricating oil from leaking through non-penetrating parts and external debris from entering the box internal. The double-sided sealing of the rotating through part of the multi-function vehicle under the dual-mode working conditions of high-speed operation and low-speed operation is realized, and the structure is simple, the disassembly and maintenance are convenient, and the sealing effect is reliable.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is an enlarged schematic diagram of part I in Fig. 1 .

Fig. 3 is a schematic structural view of the bearing sleeve described in the present invention.

Fig. 4 is a schematic structural view of the bearing end cover of the present invention.

Fig. 5 is a schematic diagram of the cross-sectional structure along the line A-A of Fig. 4 .

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the scope of protection of the present invention is not limited to the following Described embodiment.

As shown in Figures 1-5, the sealing structure of the axle gear box of the utility model described in the utility model includes a shaft sealing device for supporting the bevel gear shaft 7 arranged in the shaft hole of the side wall of the axle gear box; The sealing device includes a bearing sleeve cup 2 set in the shaft hole, a four-point contact ball bearing 10 and a cylindrical roller bearing 11 arranged in the bearing sleeve cup 2, and fixed on the axle gearbox side wall 1 for The axially positioned bearing end cover 4 is provided with an adjustment ring 9 between the bearing end cover 4 and the four-point contact ball bearing 10 .

As shown in Figure 3, a first radial oil inlet hole 29, a second radial oil inlet hole 30, a third radial radial oil inlet hole 32, and an axial oil inlet hole are provided on the sleeve wall of the bearing cup 2. 31 and the oil return hole 13 communicating with the inner cavity of the axle gearbox, the first radial oil inlet hole 29, the second radial oil inlet hole 30 and the third radial oil inlet hole 32 are mutually connected with the axial oil inlet hole 31 respectively Through; the bearing sleeve cup 2 is also provided with an annular groove 33 on the wall, and the annular groove 33 is set corresponding to the second radial oil inlet hole 30 and the oil inlet port of the axle gear box; the bearing sleeve cup 2 is located in the axle gear box. An oil retaining flange 2 - 1 is provided at the end, and a first oil collecting groove 12 is formed between the oil retaining flange 2 - 1 and the cylindrical roller bearing 11 .

As shown in Figures 2, 4, and 5, the inner peripheral surface of the shaft hole of the bearing end cover 4 is provided with the first sealing flange 4-1 of the end cover, the second sealing flange 4-2 of the end cover and the end cover at intervals along the axial direction. The third sealing flange 4-3, the second oil collecting groove 15 is formed between the third sealing flange 4-3 of the end cover, the adjustment ring 9 and the four-point contact ball bearing 10; the outer end surface of the bearing end cover 4 is arranged radially at intervals There are the fourth sealing flange 4-4 of the end cover, the fifth sealing flange 4-5 of the end cover and the sixth sealing flange 4-6 of the end cover; the fourth sealing flange 4-4 of the end cover is sealed with the fifth sealing flange of the end cover The first labyrinth seal groove 16 is formed between the flanges 4-5, the second labyrinth seal groove 17 is formed between the fifth seal flange 4-5 of the end cover and the sixth seal flange 4-6 of the end cover; the bearing end cover 4 There are a first axial oil return hole 24, a second axial oil return hole 3 and a radial oil return hole 14, and the radial oil return hole 14 is connected with the first axial oil return hole 24 and the second axial oil return hole respectively. The oil holes 3 communicate with each other, and the second axial oil return hole 3 communicates with the oil return hole 13 on the bearing sleeve cup 2; at least one set of oil inlet grooves 34 are also arranged on the bearing end cover 4, and the oil inlet grooves 34 are connected with the bearing sleeve cup respectively. The third radial oil inlet hole 32 of 2 is provided correspondingly.

As shown in Figure 2, a sealing ring 8 is set in the shaft hole of the bearing end cover 4, and the inner ring surface of the sealing ring 8 is provided with a first sealing flange 8-1 of the sealing ring and a second sealing flange 8-1 of the sealing ring. 2. The third sealing flange 8-3 of the sealing ring and the fourth sealing flange 8-4 of the sealing ring; the third sealing flange 4-3 of the end cover corresponds to the fourth sealing flange 8-4 of the sealing ring and forms the fourth A radial sealing gap 23-1, the second sealing flange 4-2 of the end cap corresponds to the third sealing flange 8-3 of the sealing ring and forms a second radial sealing gap 23-2, the first sealing flange 4-2 of the end cap The edge 4-1 corresponds to the second sealing flange 8-2 of the sealing ring and forms the third radial sealing gap 23-3; the first radial sealing gap 23-1, the second radial sealing gap 23-2 and the second radial sealing gap The diameters of the three radial sealing gaps 23-3 increase sequentially to form a stepped sealing structure; the second sealing flange 4-2 of the end cover, the third sealing flange 4-3 of the end cover and the third sealing flange 8-3 of the sealing ring 3 and the fourth sealing flange 8-4 of the sealing ring form a first annular sealing chamber 21; the second sealing flange 4-2 of the end cover, the first sealing flange 4-1 of the end cover and the second sealing ring of the sealing ring The second annular sealing chamber 20 is formed between the flanges 8-2; between the first sealing flange 8-1 of the sealing ring, the second sealing flange 8-2 of the sealing ring and the first sealing flange 4-1 of the end cover The third annular sealing chamber 19 is surrounded; the bottoms of the first annular sealing chamber 21 and the second annular sealing chamber 20 communicate with the first axial oil return hole 24 of the bearing cover 4 .

As shown in Figures 1 and 2, a bevel shaft flange 6 is set on the bevel gear shaft 7 located outside the sealing ring 8, and a ring platform is provided on the outer peripheral surface of the bevel shaft flange 6 on the side of the bearing end cover 4. The ring platform The inner sleeve is equipped with a labyrinth ring 5, and the labyrinth ring 5 is located on the side wall of the bearing end cover 4 and is provided with a labyrinth ring first sealing flange 5-1 and a labyrinth ring second sealing flange 5-1 along the radial direction from bottom to top. 2. The third labyrinth seal groove 18 is formed between the first sealing flange 5-1 of the labyrinth ring and the second sealing flange 5-2 of the labyrinth ring. The lower surface of the first sealing flange 5-1 of the labyrinth ring is provided with radial The protrusion 28; the fourth labyrinth seal groove 22 is enclosed between the taper shaft flange 6, the second seal flange 5-2 of the labyrinth ring and the first seal flange 8-1 of the seal ring.

As shown in Figures 1 and 2, the sixth sealing flange 4-6 of the end cover of the bearing end cover 4 extends into the fourth labyrinth seal groove 22, while the fifth sealing flange 4-5 of the end cover of the bearing end cover 4 extends To the third labyrinth seal groove 18 of the labyrinth ring 5, the first seal flange 5-1 of the labyrinth ring extends to the first labyrinth seal groove 16 of the bearing cover 4, and the second seal flange 5-2 of the labyrinth ring extends to A labyrinth seal is jointly formed in the second labyrinth seal groove 17 of the bearing end cover 4 .

As shown in Figure 2, a first O-ring 25 is provided between the bearing sleeve cup 2 and the bearing end cover 4, and between the oil return hole 13 of the bearing sleeve 2 and the axial oil return hole 3 of the bearing end cover 4 A second O-ring seal 26 is provided, and a third O-ring seal 27 is provided between the bearing sleeve cup 2 and the side wall 1 of the axle gearbox.

The sealing principle of the utility model is briefly described as follows:

When the multi-purpose vehicle is operating at low speed, the speed of the gearbox is low, and the amount of oil churning driven by the rotation of the gears in the box is also small, which may cause insufficient amount of lubricating oil for the bearings. In order to solve this problem, the utility model forms an oil collecting tank by setting up a series of oil inlets on the side wall 1 of the axle gear box, the bearing sleeve cup 2 and the bearing end cover 4 and adding some flanges, and the lubricating oil stored in the oil collecting tank The four-point contact ball bearing 10 and the cylindrical roller bearing 11 are lubricated. The lubricating oil in the box passes through the gear oil, a part enters in the first oil sump 12, and a part is thrown on the inner wall of the box, flows into the oil sump on the box along the inner wall of the box, and passes through the oil sump on the box. At least one group of oil inlets flows into the annular groove 33 opened on the bearing sleeve cup 2, through the first radial oil inlet hole 29 and the second radial oil inlet hole 30 opened in the annular groove 33 along the bearing sleeve The axial oil inlet hole 31 provided on the cup 2, the third radial oil inlet hole 32, the first radial oil inlet hole 29, and at least one group of oil inlet grooves 34 provided on the bearing end cover 4 flow into the first oil inlet hole 34 respectively. In the oil sump 12 and the second oil sump 15, the four-point contact ball bearing 10 and the cylindrical roller bearing 11 are respectively lubricated, thereby ensuring that the bearings in the gear box have sufficient amount of lubricating oil when the multi-purpose vehicle is operating at low speed. Lubricate the bearings.

When the multi-purpose vehicle is running at high speed, due to the high speed of the gearbox, the rotation of the gears, bearings and other rotating parts in the box makes the internal pressure of the box higher than the external pressure, and the amount of oil churning driven by the rotation of the gears is also large, making The amount of lubricating oil in the second oil collecting groove 15 is relatively large, so that the lubricating oil level in the second oil collecting groove 15 is higher than the first axial oil return hole 24 opened by the bearing end cover 4, so that a small part of lubricating oil passes through the bearing end cover The first radial sealing gap 23-1 formed between the third sealing flange 4-3 of the sealing ring 4 and the fourth sealing flange 8-4 of the sealing ring 8 overflows into the first annular sealing chamber 21 in the axial direction. Since the first annular sealing chamber 21 has a better decompression effect on the overflowing lubricating oil, most of the overflowing lubricating oil flows directly along the inner wall of the first annular sealing chamber 21 to the The bottom of the cavity, and through the first axial oil return hole 24, the radial oil return hole 14, the second axial oil return hole 3 opened on the bearing cover 4, and the oil return hole 13 opened on the bearing sleeve cup 2 Enter the second oil collecting tank 15, and flow back into the box together with most of the lubricating oil whose liquid level is higher than that of the first axial oil return hole 24 opened by the bearing end cover 4. For the part of the oil and gas that is attached to the sealing ring 8 and continues to overflow in the axial direction, it is formed between the second sealing flange 4-2 of the end cover of the bearing end cover 4 and the third sealing flange 8-3 of the sealing ring 8. The second radial sealing gap 23-2 of the sealing ring 8 and the radial oil throwing effect of the second sealing flange 8-2 of the sealing ring 8 overflow into the second annular sealing chamber 20, and further decompression through the second annular sealing chamber 20 . Since the bottom of the second annular seal chamber 20 communicates with the first axial oil return hole 24 provided by the bearing end cover 4, the finally overflowed lubricating oil passes through the first axial oil return hole 24 opened by the bearing end cover 4, the diameter The oil return hole 13 opened to the oil return hole 14, the second axial oil return hole 3 and the bearing sleeve cup 2 flows back into the box to realize the circulation of lubricating oil in the gearbox. Since the fourth sealing flange 4-4 of the end cover of the bearing end cover 4 is an oblique flange, it effectively prevents most of gas, rain, snow, dust and other sundries from entering the inside of the casing. Since the bottom of the first sealing flange 5-1 on the labyrinth ring 5 has a radial projection 28, it can further prevent the entry of foreign matter such as gas, rain, snow, dust, etc. outside the box. Since the bearing end cover 4 and the labyrinth ring 5 have axial protrusions, and the first labyrinth seal groove 16, the second labyrinth seal groove 17 and the third labyrinth seal groove 18 formed between each opposite flange and each flange Together they form an axial labyrinth seal, so a small amount of air, rain, snow, dust and other sundries that enter the axial labyrinth seal chamber further hinder the sundries from entering the interior of the sealing device under the action of gravity and centrifugal force. The arrangement of the first O-ring seal 25, the second O-ring seal 26 and the third O-ring seal 27 effectively prevents lubricating oil from leaking through the non-penetrating parts and external debris from entering the inside of the box.

In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore It should not be construed as a limitation of the present invention.

Claims (5)

1. a kind of MPV axle gear box sealing structure, including it is arranged on the axle gear box side wall（1）Used in axis hole In support bevel gear shaft（7）Shaft sealer；The shaft sealer includes the bearing a set of cups being arranged in the axis hole （2）, it is arranged on the bearing a set of cups（2）Interior four-point contact ball（10）And cylinder roller bearing（11）, and be fixed on Axle gear box side wall（1）The upper bearing (ball) cover for axially position（4）, the bearing (ball) cover（4）With the four-point contact ball Bearing（10）Between be provided with adjustment ring（9）；It is characterized in that：

The bearing a set of cups（2）Jacket wall on offer the first radial direction fuel feed hole（29）, the second radial direction fuel feed hole（30）, the 3rd footpath To radial direction fuel feed hole（32）, axial fuel inlet hole（31）With the spill port communicated with axle gear box cavity（13）, first footpath To fuel feed hole（29）, the second radial direction fuel feed hole（30）With the 3rd radial direction fuel feed hole（32）Respectively with axial fuel inlet hole（31）Mutually pass through It is logical；Bearing a set of cups（2）Annular groove is further opened with jacket wall（33）, the annular groove（33）With the second radial direction fuel feed hole（30）And car The oil inlet of shaft gear case is corresponding；Bearing a set of cups（2）End set in axle gear box has the oily flange of gear（2-1）, The oily flange of gear（2-1）With the cylinder roller bearing（11）Between form the first oil trap（12）；

The bearing (ball) cover（4）Axis hole inner peripheral surface axially spaced be provided with the sealing flange of end cap first（4-1）, end cap second Sealing flange（4-2）With the sealing flange of end cap the 3rd（4-3）, the sealing flange of end cap the 3rd（4-3）With the adjustment ring （9）, four-point contact ball（10）Between form the second oil trap（15）；Bearing (ball) cover（4）The radially spaced setting in outer face There is the sealing flange of end cap the 4th（4-4）, the sealing flange of end cap the 5th（4-5）With the sealing flange of end cap the 6th（4-6）；The end cap 4th sealing flange（4-4）With the sealing flange of end cap the 5th（4-5）Between form the first labyrinth seal groove（16）, end cap the 5th is close Seal flange（4-5）With the sealing flange of end cap the 6th（4-6）Between form the second labyrinth seal groove（17）；Bearing (ball) cover（4）On open Provided with the first axial spill port（24）, the second axial spill port（3）With radial direction spill port（14）, the radial direction spill port（14）Point Not with the described first axial spill port（24）With the second axial spill port（3）It is mutually communicated, the second axial spill port（3）With The bearing a set of cups（2）On spill port（13）Communicate；Bearing (ball) cover（4）On be additionally provided with least one set of oil-feed tank（34）, institute State oil-feed tank（34）With bearing a set of cups（2）The 3rd radial direction fuel feed hole（32）It is corresponding；

In the bearing (ball) cover（4）Axis hole in be set with sealing ring（8）, the sealing ring（8）Inner ring surface be provided with sealing The sealing flange of ring first（8-1）, the sealing flange of sealing ring second（8-2）, the sealing flange of sealing ring the 3rd（8-3）With sealing ring Four sealing flanges（8-4）；The sealing flange of end cap the 3rd（4-3）With the sealing flange of sealing ring the 4th（8-4）It is corresponding And form the first radial seal gap（23-1）, the sealing flange of end cap second（4-2）Sealed with the sealing ring the 3rd convex Edge（8-3）Corresponding and the second radial seal gap of formation（23-2）, the sealing flange of end cap first（4-1）With the sealing The sealing flange of ring second（8-2）Corresponding and the 3rd radial seal gap of formation（23-3）；The sealing flange of end cap second（4- 2）, the sealing flange of end cap the 3rd（4-3）And the sealing flange of sealing ring the 3rd（8-3）With the sealing flange of sealing ring the 4th（8-4） Between surround first annular annular seal space（21）；The sealing flange of end cap second（4-2）, the sealing flange of end cap first（4-1）With And the sealing flange of sealing ring second（8-2）Between surround the second annular seal space（20）；The sealing flange of sealing ring first（8-1）、 The sealing flange of sealing ring second（8-2）With the sealing flange of end cap first（4-1）Between surround the 3rd annular seal space（19）；It is described First annular annular seal space（21）, the second annular seal space（20）Bottom and bearing (ball) cover（4）The first axial spill port （24）Communicate.

2. MPV axle gear box sealing structure according to claim 1, it is characterised in that：The shaft sealer Also include axis of cone flange（6）, the axis of cone flange（6）It is sleeved on and is located at the sealing ring（8）The bevel gear shaft in outside（7）On； In axis of cone flange（6）It is located at the bearing (ball) cover on outer peripheral face（4）Side offers land, and labyrinth ring is set with the land （5）, the labyrinth ring（5）Positioned at bearing (ball) cover（4）It is close that labyrinth ring first is radially provided with the side wall of side from bottom to top Seal flange（5-1）With the sealing flange of labyrinth ring second（5-2）, the sealing flange of labyrinth ring first（5-1）With labyrinth ring second Sealing flange（5-2）Between formed the 3rd labyrinth seal groove（18）, the sealing flange of labyrinth ring first（5-1）Lower surface set It is equipped with radial protrusion（28）；Axis of cone flange（6）With the sealing flange of labyrinth ring second（5-2）With the sealing flange of sealing ring first （8-1）Between surround the 4th labyrinth seal groove（22）.

3. MPV axle gear box sealing structure according to claim 2, it is characterised in that：The bearing (ball) cover （4）The sealing flange of end cap the 6th（4-6）Extend to the 4th labyrinth seal groove（22）In, while the bearing (ball) cover（4） The sealing flange of end cap the 5th（4-5）Extend to labyrinth ring（5）The 3rd labyrinth seal groove（18）In, the labyrinth ring first is close Seal flange（5-1）Extend to bearing (ball) cover（4）The first labyrinth seal groove（16）In, the sealing flange of labyrinth ring second（5- 2）Extend to bearing (ball) cover（4）The second labyrinth seal groove（17）In be collectively forming labyrinth seal.

4. MPV axle gear box sealing structure according to claim 1, it is characterised in that：The bearing a set of cups （2）With bearing (ball) cover（4）Between be provided with the first O-ring seals（25）, the bearing a set of cups（2）Spill port（13）With bearing end Lid（4）Axial spill port（3）Between be provided with the second O-ring seals（26）, the bearing a set of cups（2）With the axle gear box Side wall（1）Between be provided with the 3rd O-ring seals（27）.

5. MPV axle gear box sealing structure according to claim 1, it is characterised in that：Described first is radially close Seal gap（23-1）, the second radial seal gap（23-2）With the 3rd radial seal gap（23-3）Diameter it is incremented by successively, shape Into stepped sealing structure.