CN102954194A - Railway vehicle traveling gearbox sealing structure - Google Patents

Abstract

The invention discloses a railway vehicle traveling gearbox sealing structure which comprises an end cover, a framework oil seal, a bearing pedestal, a sealing ring and a sealing sleeve, wherein a first sealing flange of the bearing pedestal is corresponding to a first flange of the sealing ring to form a first circumferential sealing gap; a second sealing flange of the bearing pedestal is corresponding to a second flange of the sealing ring to form a second circumferential sealing gap; a third sealing flange of the bearing pedestal is corresponding to a third flange of the sealing ring to form a third circumferential sealing gap; a fifth sealing flange of the bearing pedestal extends into a second maze sealing groove of the sealing ring; a fourth flange of the sealing ring extends into a first maze sealing groove of the bearing pedestal to form maze sealing; first, second and third sealing cavities are formed between the bearing pedestal and the sealing ring; oil return holes are arranged on the bearing pedestal and located at the bottoms of the sealing cavities; the framework oil seal is arranged between the end cover and the sealing sleeve; and contact type sealing is formed between the framework oil seal and the sealing sleeve. The railway vehicle traveling gearbox sealing structure is reliable in bidirectional sealing and simple in structure.

Description

Sealing structure of running gear box for rail vehicles

technical field

The invention relates to a sealing structure for a rotating through part of a gear box lubricated by oil, and is especially suitable for sealing the rotating through part of an axle of a transmission gear box for medium and high-speed rail vehicles.

Background technique

At present, most of my country's rail vehicle running gearboxes are lubricated with oil. If the lubricating oil leaks during the use of the running gearbox, it will not only affect the service life of important parts such as gears and bearings in the gearbox, but also cause environmental pollution along the track, and even affect the adhesion performance of the running part of the vehicle. At the same time, during the use of the gearbox, once foreign rain, snow, dust and other sundries enter the gearbox, it will have varying degrees of impact on the service life of the bearings, gears, etc. and the performance of the lubricating oil. Therefore, in the design of the gearbox When sealing the system, it is not only required to ensure that the lubricating oil in the gearbox cannot leak out, but also must require that debris outside the gearbox cannot enter the interior of the box, that is, the sealing structure of the gearbox must be able to achieve double-sided sealing.

In the Chinese Patent Publication No.: CN102009663A, the patent literature titled "Gear Box Sealing Structure for Urban Rail Vehicles" introduces a bidirectional sealing structure for urban rail vehicle gearboxes. In this technical solution, only one circumferential sealing gap is provided, so it is only suitable for occasions such as urban rails and subways where the running speed is not high. As the running speed of the traveling gearbox increases, the internal pressure of the gearbox also increases relatively, and the reliability of the seal cannot meet the requirements of the traveling gearbox.

As the running speed of my country's rail vehicles continues to develop to medium and high speeds, the reliability requirements are also getting higher and higher. Among them, the sealing system of the traveling gearbox requires reliable bidirectional sealing, compact structure, suitable for high-speed operation requirements, and easy maintenance.

Contents of the invention

The object of the present invention is to provide a sealing structure of a rail vehicle running gear box with reliable bidirectional sealing, simple structure and meeting the requirements of medium and high speed running.

The technical solution for achieving the above purpose is: a sealing structure for a rail vehicle running gear box, including a bearing seat fixed on the box body and a sealing ring fixed on the axle, the bearing seat has a matching hole for installing the outer ring of the bearing, and It has the first sealing flange of the bearing seat, the fourth sealing flange of the bearing seat and the fifth sealing flange of the bearing seat. The first labyrinth sealing groove is formed between the fourth sealing flange of the bearing seat and the fifth sealing flange of the bearing seat. The sealing ring has a first flange of the sealing ring, a third flange of the sealing ring and a fourth flange of the sealing ring, a second labyrinth sealing groove is formed between the fourth flange of the sealing ring and the ring body of the sealing ring, and the bearing seat The first sealing flange of the bearing seat corresponds to the first flange of the sealing ring of the sealing ring and forms a first circumferential sealing gap, and the fifth sealing flange of the bearing seat extends in the second labyrinth sealing groove of the sealing ring At the same time, the fourth flange of the sealing ring extends in the first labyrinth seal groove of the bearing seat to form a labyrinth seal, and the fourth sealing flange of the bearing seat and the fourth flange of the sealing ring are both oblique flanges , a labyrinth sealing conical ring groove is formed between the inclined flanges, a first annular sealing cavity is formed between the bearing seat and the sealing ring, and an oil return hole communicating with the inside of the box is provided at the bottom of the first annular sealing cavity. The bearing seat also has a second sealing flange of the bearing seat, a third sealing flange of the bearing seat, and the sealing ring also has a second flange of the sealing ring, and the sealing of the second sealing flange of the bearing seat of the bearing seat and the sealing ring The second flange of the ring corresponds to and forms a second circumferential sealing gap, and the third sealing flange of the bearing seat of the bearing seat corresponds to the third flange of the sealing ring of the sealing ring and forms a third circumferential sealing gap, so The second sealing flange of the bearing housing, the third sealing flange of the bearing housing, the second sealing ring flange of the sealing ring, and the third sealing ring flange of the sealing ring form a second annular sealing cavity. The top of the fourth sealing flange has a radial protrusion, and an oil collection groove is formed between the radial protrusion and the outer wall of the fourth sealing flange of the bearing seat, and the top of the third sealing flange of the bearing seat has an axial protrusion. A third annular sealing cavity is formed between the third sealing flange of the bearing seat, the fourth sealing flange of the bearing seat, the end wall of the bearing seat, and the third flange of the sealing ring of the sealing ring. The second annular sealing cavity , the bottom of the third annular sealing chamber is connected with the oil return hole, the outer side of the bearing seat is fixed with an end cover, and the axle is also fixedly fitted with a sealing sleeve at the corresponding position of the end cover, between the end cover and the sealing sleeve A skeleton oil seal is provided, and the skeleton oil seal forms a contact seal with the sealing sleeve.

The diameters of the first circumferential sealing gap, the second circumferential sealing gap and the third circumferential sealing gap decrease successively to form a stepped sealing structure.

A number of circumferential decompression grooves are respectively opened on the corresponding peripheral surfaces of the first sealing flange of the bearing seat of the bearing seat and the first flange of the sealing ring of the sealing ring.

The end cover is provided with a radial oil injection hole, and the wall of the central hole of the end cover is provided with a circumferential grease storage groove.

The maximum outer diameter of the sealing ring is smaller than the minimum inner diameter of the bearing outer ring installed in the fitting hole of the bearing seat.

After the above structure is adopted, since the top of the fourth sealing flange of the bearing seat has a radial protrusion, an oil collecting groove is formed between the radial protrusion and the outer wall of the fourth sealing flange of the bearing seat, so that oil can be effectively prevented from directly entering the labyrinth seal , but flows into the third annular seal chamber; since the top of the third sealing flange of the bearing seat has an axial protrusion, it can better store the oil in the third annular seal chamber; because the fourth seal of the bearing seat The flange and the fourth flange of the sealing ring are oblique flanges, and a labyrinth sealing conical ring groove is formed between the oblique flanges. Using the principle of conical pump oil, it is difficult for oil to enter the labyrinth sealing groove, which increases the reliability of the labyrinth seal. Effect: Since the first annular sealing chamber, the second annular sealing chamber and the third annular sealing chamber formed between the bearing seat and the sealing ring gradually decompress the oil overflowing inside, the oil flows along the chamber wall to the bottom of the chamber, and passes through The oil return hole flows back to the inside of the box, and through the decompression of the three ring-shaped sealing chambers from the inside to the outside, the pressure of the oil mist gradually decreases, which increases the difficulty of oil mist leakage and improves the sealing effect; because the corresponding position of the axle is still fixed The sleeve is equipped with a sealing sleeve, and there is a skeleton oil seal between the end cover and the sealing sleeve. The skeleton oil seal and the sealing sleeve form a contact seal, so that it can prevent external rainwater, dust, etc. from invading the inside of the box. By using the above sealing structure, the gear The double-sided sealing of the rotating through part of the tank under medium and high-speed working conditions has a reliable sealing effect; because the diameters of the first circumferential sealing gap, the second circumferential sealing gap and the third circumferential sealing gap are successively reduced, the formed stepped shape The sealing structure gradually increases the pressure required for the oil mist to leak out; because there are several circumferential decompression grooves on the corresponding end faces of the first sealing flange of the bearing seat and the first flange of the sealing ring of the sealing ring , so the oil leakage resistance of the first circumferential sealing gap can be increased, and the sealing effect of the first circumferential sealing gap can be strengthened; since the end cover has an oil injection hole and a grease storage groove, which communicate with the installation groove of the skeleton oil seal, regular passage Grease is added to the oil injection hole to form grease lubrication between the skeleton oil seal and the sealing sleeve, which reduces friction loss and prevents external impurities from entering the installation groove; since the maximum outer diameter of the sealing ring is smaller than that installed in the matching hole of the bearing seat The smallest inner diameter of the outer ring of the bearing, so the sealing structure is easy to install. The invention can make the high-pressure lubricating oil produced by the vehicle under medium and high-speed working conditions pass through three circumferential sealing gaps, a labyrinth seal and a skeleton oil seal to form multiple sealing guarantees, and the sealing effect is reliable. In addition, the present invention also has the characteristics of simple structure, low wear and easy maintenance.

Description of drawings

Fig. 1 is the structural representation of the sealing structure of the rail vehicle running gear box of the present invention;

Fig. 2 is an enlarged view of part I in Fig. 1 .

Detailed ways

The present invention is described in further detail below in conjunction with the embodiment that accompanying drawing provides.

As shown in Figures 1 and 2, a sealing structure for a rail vehicle running gear box includes a bearing seat 1 fixed on the box body 15 and a sealing ring 4 fixed on the axle 16, and the bearing seat 1 has a bearing outer ring The matching hole of the bearing seat also has the first sealing flange 1-1 of the bearing seat, the fourth sealing flange 1-4 of the bearing seat and the fifth sealing flange 1-5 of the bearing seat, the fourth sealing flange 1-4 of the bearing seat and the A first labyrinth seal groove 6 is formed between the fifth sealing flanges 1-5 of the bearing seat, and the sealing ring 4 has a first sealing ring flange 4-1, a third sealing ring flange 4-3 and a fourth sealing ring flange. Flange 4-4, sealing ring The second labyrinth seal groove 7 is formed between the fourth flange 4-4 and the ring body of the sealing ring 4, and the first sealing flange 1-1 of the bearing seat of the bearing seat 1 and the sealing ring 4 corresponds to the first flange 4-1 of the sealing ring and forms a first circumferential sealing gap 8-1, and the fifth sealing flange 1-5 of the bearing housing 1 extends in the second labyrinth of the sealing ring 4 In the sealing groove 7, at the same time, the fourth flange 4-4 of the sealing ring of the sealing ring 4 extends in the first labyrinth sealing groove 6 of the bearing housing 1 to form a labyrinth seal, and the fourth sealing flange 1-4 of the bearing housing and the fourth flange 4-4 of the sealing ring are oblique flanges, and a labyrinth sealing conical ring groove 18 is formed between the oblique flanges, and a first annular sealing cavity 9 is formed between the bearing seat 1 and the sealing ring 4, and the second The bottom of an annular sealing chamber 9 is provided with an oil return hole 12 communicating with the inside of the box body 15. The bearing seat 1 also has a second sealing flange 1-2 of the bearing seat, a third sealing flange 1-3 of the bearing seat, and The seal ring 4 also has a seal ring second flange 4-2, the bearing seat second seal flange 1-2 of the bearing seat 1 corresponds to the seal ring second flange 4-2 of the seal ring 4 and forms a The second circumferential sealing gap 8-2, the third sealing flange 1-3 of the bearing seat 1 corresponds to the third sealing ring flange 4-3 of the sealing ring 4 and forms a third circumferential sealing gap 8-3, the second sealing flange 1-2 of the bearing housing 1, the third sealing flange 1-3 of the bearing housing, the second sealing ring flange 4-2 of the sealing ring 4, the third sealing ring flange A second annular sealing cavity 10 is formed between the flanges 4-3, and the top of the fourth sealing flange 1-4 of the bearing seat has a radial protrusion 19, and the radial protrusion 19 is connected with the fourth sealing flange 1 of the bearing seat. -4 An oil collecting groove 20 is formed between the outer sidewalls, and the top of the third sealing flange 1-3 of the bearing seat has an axial protrusion 21, the third sealing flange 1-3 of the bearing seat of the bearing seat 1, the bearing seat A third annular sealing cavity 11 is formed between the fourth sealing flange 1-4, the end wall of the bearing seat 1-6 and the third sealing ring flange 4-3 of the sealing ring 4, and the second annular sealing cavity 10, The bottom of the third annular sealing chamber 11 is connected with the oil return hole 12, the outer side of the bearing seat 1 is fixed with an end cover 2, and the axle 16 is also fixedly fitted with a sealing sleeve 5 at the corresponding position of the end cover 2. A skeleton oil seal 3 is arranged between the cover 2 and the sealing sleeve 5, and the skeleton oil seal 3 and the sealing sleeve 5 form a contact seal.

As shown in Figure 2, in order to form a stepped sealing structure and further enhance the sealing effect, the first circumferential sealing gap 8-1, the second circumferential sealing gap 8-2 and the third circumferential sealing gap 8- The diameters of 3 decrease successively to form a stepped sealing structure.

As shown in Figure 2, in order to increase the oil leakage resistance at the first circumferential sealing gap and strengthen the sealing effect of the first circumferential sealing gap, the first sealing flange 1-1 of the bearing seat 1 and the sealing ring The corresponding peripheral surfaces of the first flange 4-1 of the sealing ring 4 are respectively provided with a number of circumferential decompression grooves 13.

As shown in Figures 1 and 2, in order to facilitate grease injection, the end cover 2 is provided with a radial oil injection hole 14 and a circumferential grease storage groove 22 is provided on the hole wall of the central hole of the end cover 2 . Lubricating grease can be regularly added through the oil injection hole 14 to form grease lubrication between the skeleton oil seal 3 and the sealing sleeve 5 to reduce friction loss.

As shown in FIG. 1 , for ease of assembly, the maximum outer diameter of the sealing ring 4 is smaller than the minimum inner diameter of the outer ring of the bearing 17 installed in the matching hole of the bearing housing 1 .

As shown in Figure 1, the sealing sleeve 5 is made of a material with certain hardness and wear resistance, and has a smooth surface.

Claims (5)

1. sealing structure for traveling gearbox of railway vehicle, comprise the bearing support (1) that is fixed on the casing (15) and be fixed on seal ring (4) on the axletree (16), described bearing support (1) has the matching hole of installation shaft bearing outer-ring, also has bearing support the first sealing flange (1-1), bearing support the 4th sealing flange (1-4) and bearing support the 5th sealing flange (1-5), form the first labyrinth seal groove (6) between bearing support the 4th sealing flange (1-4) and bearing support the 5th sealing flange (1-5), described seal ring (4) has seal ring the first flange (4-1), seal ring the 3rd flange (4-3) and seal ring the 4th flange (4-4), form the second labyrinth seal groove (7) between seal ring the 4th flange (4-4) and seal ring (4) ring body, bearing support first sealing flange (1-1) of described bearing support (1) is corresponding with seal ring first flange (4-1) of seal ring (4) and form the first circumferential seal gap (8-1), bearing support the 5th sealing flange (1-5) of described bearing support (1) is stretched in the second labyrinth seal groove (7) of seal ring (4), seal ring the 4th flange (4-4) of described seal ring (4) is stretched and form labyrinth seal in the first labyrinth seal groove (6) of bearing support (1) simultaneously, described bearing support the 4th sealing flange (1-4) is oblique flange with seal ring the 4th flange (4-4), tiltedly form labyrinth seal taper annular groove (18) between the flange, form the first annular seal space (9) between described bearing support (1) and the seal ring (4), the first annular seal space (9) bottom is provided with the spill port (12) that communicates with casing (15) inside, it is characterized in that:

A, described bearing support (1) also have bearing support the second sealing flange (1-2), bearing support the 3rd sealing flange (1-3),

B, described seal ring (4) also have seal ring the second flange (4-2),

Bearing support second sealing flange (1-2) of d, described bearing support (1) is corresponding with seal ring second flange (4-2) of seal ring (4) and form second week to seal clearance (8-2),

Bearing support the 3rd sealing flange (1-3) of e, described bearing support (1) is corresponding with seal ring the 3rd flange (4-3) of seal ring (4) and form the 3rd circumferential seal gap (8-3),

Surround the second annular seal space (10) between seal ring second flange (4-2) of bearing support second sealing flange (1-2) of f, described bearing support (1), bearing support the 3rd sealing flange (1-3) and seal ring (4), seal ring the 3rd flange (4-3)

G, described bearing support the 4th sealing flange (1-4) top have radial protrusion (19), form oil trap (20) between radial protrusion (19) and bearing support the 4th sealing flange (1-4) outer side wall, described bearing support the 3rd sealing flange (1-3) top has axial projection (21)

Surround the 3rd annular seal space (11) between seal ring the 3rd flange (4-3) of bearing support the 3rd sealing flange (1-3) of h, described bearing support (1), bearing support the 4th sealing flange (1-4), bearing support end wall (1-6) and seal ring (4),

I, described the second annular seal space (10), the 3rd annular seal space (11) bottom all communicates with spill port (12),

The outside of j, described bearing support (1) is fixed with end cap (2), stuffing box gland (5) is equipped with in the corresponding position that is positioned at end cap (2) on the described axletree (16) also fixed cover, be provided with outside framework oil seal (3) between end cap (2) and the stuffing box gland (5), outside framework oil seal (3) forms contact seal with stuffing box gland (5).

2. sealing structure for traveling gearbox of railway vehicle according to claim 1, it is characterized in that: described the first circumferential seal gap (8-1), second week successively decrease successively to the diameter in seal clearance (8-2) and the 3rd circumferential seal gap (8-3), form the stepped shaft sealing configuration.

3. sealing structure for traveling gearbox of railway vehicle according to claim 1 is characterized in that: have some circumferential decompressing grooves (13) on the corresponding side face of bearing support first sealing flange (1-1) of described bearing support (1) and seal ring first flange (4-1) of seal ring (4).

4. sealing structure for traveling gearbox of railway vehicle according to claim 1 is characterized in that: have on the described end cap (2) radially oil hole (14) and the hole wall of the center hole of end cap (2) on have the circumferential fat groove (22) of depositing.

5. sealing structure for traveling gearbox of railway vehicle according to claim 1 is characterized in that: the maximum outside diameter of described seal ring (4) is less than the minimum diameter of bearing (17) outer ring in the matching hole that is installed in bearing support (1).

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