CN219062388U - Sealing structure of gear box and gear box - Google Patents

Abstract

The utility model relates to the technical field of gear boxes, and discloses a sealing structure of a gear box and the gear box, wherein the sealing structure of the gear box comprises the following components: the oil slinger can be sleeved on a gear shaft of the gear box, one end of an inner ring of a bearing on the gear shaft is abutted with the oil slinger, and a sealing groove is formed in the outer wall of the oil slinger; the sealing ring is arranged in the sealing groove, the two ends of the sealing ring are free ends, at least part of the inner wall of the sealing ring is in contact with the sealing groove, and at least part of the inner wall of the sealing ring is arranged at intervals with the sealing groove; the outer stationary ring is in radial abutting sealing ring, and the outer stationary ring and the oil slinger are in clearance arrangement. The sealing structure of the gear box disclosed by the utility model is suitable for vehicles running in a sand wind environment, improves the sealing effect of the sealing structure, prolongs the service life of the bearing, and ensures that the sealing structure can normally run because a gap exists between the sealing ring and the oil slinger and the outer stationary ring and the sealing ring cannot rotate along with the rotation of the gear shaft.

Description

Sealing structure of gear box and gear box

Technical Field

The utility model relates to the technical field of gearboxes, in particular to a sealing structure of a gearbox and the gearbox.

Background

With the continuous development of urban rail traffic in the middle east, egypt and other wind and sand areas, the sealing structure of the existing gearbox cannot be suitable for vehicles running in the wind and sand environment, the sealing effect of the two sealing structures is not ideal, a large amount of sand and dust is easy to accumulate in the sealing structure, the sealing structure must be replaced every 30-40 kilometers when the vehicle runs, and the maintenance period of the vehicle is 100 kilometers, so that a sealing structure with better sealing effect is needed urgently, and the replacement period of the sealing structure is not lower than the maintenance period of the vehicle.

Disclosure of Invention

Based on the above, the utility model aims to provide a sealing structure of a gear box and the gear box, which are suitable for vehicles running in a sand-blown environment, and the sealing performance of the sealing structure is improved, so that external sand blown by wind, dust impurities and water vapor cannot enter the gear box, meanwhile, the oil in the gear box is prevented from leaking outwards, the bidirectional sealing is realized, and the service life of the sealing structure is prolonged.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sealing structure of a gear box, comprising: the oil slinger can be sleeved on a gear shaft of the gear box, one end of an inner ring of a bearing on the gear shaft is abutted with the oil slinger, and a sealing groove is arranged on the outer wall of the oil slinger; the sealing ring is arranged in the sealing groove, the two ends of the sealing ring are free ends, at least part of the inner wall of the sealing ring is in contact with the sealing groove, and at least part of the inner wall of the sealing ring is arranged at intervals with the sealing groove; and the outer static ring is radially abutted against the sealing ring and is in clearance arrangement with the oil slinger.

As a preferable scheme of the sealing structure of the gear box, one end of the oil slinger is provided with a first labyrinth groove which is arranged along the circumferential direction of the oil slinger, the outer stationary ring is provided with a first labyrinth boss which can correspond to the first labyrinth groove, and the first labyrinth boss is assembled in the first labyrinth groove along radial gaps.

As an optimized scheme of the sealing structure of the gear box, a second labyrinth boss and a third labyrinth boss which are arranged at intervals are arranged on the outer static ring, a second labyrinth groove and a third labyrinth groove are arranged on the oil slinger, the second labyrinth boss is assembled in the second labyrinth groove along an axial gap, and the third labyrinth boss is assembled in the third labyrinth groove along the axial gap.

As a preferable scheme of the sealing structure of the gear box, a fourth labyrinth groove is formed between the second labyrinth boss and the third labyrinth boss, a fourth labyrinth boss is formed between the second labyrinth groove and the third labyrinth groove, and the fourth labyrinth boss is assembled in the fourth labyrinth groove along an axial gap.

As an optimal scheme of the sealing structure of the gear box, a fifth labyrinth boss is formed between the sealing groove and the first labyrinth groove, and a fifth labyrinth groove which can be opposite to the fifth labyrinth boss is arranged on the outer static ring.

As a preferable scheme of the sealing structure of the gear box, the bottom of the outer stationary ring is provided with a sand discharging hole communicated with the fifth labyrinth groove.

As a preferable scheme of the sealing structure of the gear box, a wedge-shaped groove is arranged on the inner side of the top end of the third labyrinth boss.

As an optimized scheme of the sealing structure of the gear box, the sealing structure of the gear box further comprises an oil retainer sleeved on the gear shaft, the oil retainer is abutted with one end, deviating from the oil retainer, of the inner ring of the bearing, and the oil retainer is fixedly arranged on the gear shaft.

As a preferable scheme of the sealing structure of the gear box, the outer stationary ring is provided with a radial limiting boss, and the radial limiting boss can be abutted with the box body of the gear box.

The gearbox comprises a gear shaft, a bearing, a box body and the sealing structure of the gearbox, wherein the sealing structure of the gearbox is arranged between the box body and the gear shaft, and the bearing is sleeved on the gear shaft.

The beneficial effects of the utility model are as follows: the sealing structure of the gear box is suitable for vehicles running in a sand wind environment, the sealing ring on the oil slinger and the outer stationary ring assembled on the sealing ring in an interference manner, the sealing effect of the sealing structure is improved, the service life of the bearing is prolonged, and the sealing structure can normally run because a gap exists between the sealing ring and the oil slinger and the outer stationary ring and the sealing ring cannot rotate along with the rotation of a gear shaft.

The gearbox disclosed by the utility model has the characteristics of good sealing effect, long service life and wide applicability, and particularly has more excellent sealing performance in a sand wind environment.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

FIG. 1 is a cross-sectional view of a portion of the structure of a seal structure of a gearbox provided in an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a cross-sectional view of an outer stationary ring of a seal structure of a gearbox provided by an embodiment of the present utility model.

In the figure:

1. a gear shaft;

2. oil slinger; 201. sealing grooves; 202. a first labyrinth groove; 203. a second labyrinth groove; 204. a third labyrinth groove; 21. a fourth labyrinth boss; 22. a fifth labyrinth boss; 23. oil retainer claws;

3. a seal ring;

4. an outer stationary ring; 401. a fourth labyrinth groove; 402. a fifth labyrinth groove; 403. a sand discharge hole; 404. wedge-shaped grooves; 41. a first labyrinth boss; 42. radial limit boss; 43. a second labyrinth boss; 44. a third labyrinth boss;

51. a bearing; 52. oil slinger;

6. a box body.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "second," "first," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "second position" and "first position" are two different positions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The embodiment provides a seal structure of gear box, as shown in fig. 1 to 3, including oil slinger 2, sealing ring 3 and outer quiet ring 4, oil slinger 2 can be overlapped and establish on the gear shaft 1 of gear box, the one end and the oil slinger 2 butt of the inner circle of bearing 51 on the gear shaft 1 are equipped with seal groove 201 on the outer wall of oil slinger 2, sealing ring 3 sets up in seal groove 201 and the both ends of sealing ring 3 are the free end, at least part inner wall and the seal groove 201 contact of sealing ring 3, and at least part inner wall and the seal groove 201 interval setting of sealing ring 3, outer quiet ring 4 is along radial closely seal ring 3 and outer quiet ring 4 and oil slinger 2 clearance setting, the fixed setting of bearing 51 is on gear shaft 1 and the one end butt of its inner circle is on oil slinger 2.

As shown in fig. 1, the sealing structure of the gearbox of the embodiment further comprises an oil retainer 52 sleeved on the gear shaft 1, the oil retainer 52 is abutted against one end of the inner ring of the bearing 51, which is away from the oil retainer 2, and the oil retainer 52 is fixedly arranged on the gear shaft 1. Specifically, the oil slinger 52 is interference fitted to the gear shaft 1 such that the oil slinger 52 is fixedly connected to the gear shaft 1.

It should be noted that, the structure of the seal ring 3 of this embodiment is similar to a key ring, both ends of the seal ring 3 are free ends, during installation, firstly, one end of the seal ring 3 is inserted into the seal groove 201, and the seal ring 3 is slowly rotated, so that the seal ring 3 is assembled in the seal groove 201, the seal ring 3 is in a relaxed state after being assembled in the seal groove 201, the inner wall of the seal ring 3 is in clearance with the bottom wall of the seal groove 201, then, the outer stationary ring 4 is assembled on the seal ring 3 in an interference manner, during the assembly process, the outer stationary ring 4 presses the seal ring 3, so that the seal ring 3 is in a tight and tight state, at least part of the inner wall of the seal ring 3 is in contact with the seal groove 201, and at least part of the inner wall of the seal ring 3 is in interval with the seal groove 201. In the stable operation process of the gear box, the sealing ring 3 can form certain displacement in the axial direction, but the displacement is tiny, so that light contact is formed between the sealing ring 3 and the oil slinger 2, and friction force between the sealing ring 3 and the oil slinger is tiny and is close to zero friction. Eventually a steady state critical sealing condition is reached.

Specifically, the sealing ring 3 in this embodiment is a stainless steel sealing ring, which has a structural strength greater than that of a sealing ring made of plastic, and has a better wear resistance and a service life up to 30 years. The bearing 51 of this embodiment is a cylindrical roller bearing, which has a small friction coefficient, is particularly suitable for the working condition of high-speed operation, and has a roller in line contact with the raceway, and has a large radial bearing capacity, and is suitable for bearing heavy loads and impact loads.

The sealing structure of the gearbox is suitable for vehicles running in a sand wind environment, the sealing ring 3 on the oil slinger 2 and the outer stationary ring 4 assembled on the sealing ring 3 in an interference mode, the sealing effect of the sealing structure is improved, the service life of the bearing 51 is prolonged, the service life of the sealing structure of the gearbox reaches the maintenance period of the vehicle, and due to the fact that gaps exist between the sealing ring 3 and the oil slinger 2, the outer stationary ring 4 and the sealing ring 3 cannot rotate along with rotation of the gear shaft 1, and the sealing structure can normally run.

As shown in fig. 2, one end of the oil slinger 2 of the present embodiment is provided with a first labyrinth groove 202 which is arranged along the circumferential direction thereof, the outer stationary ring 4 is provided with a first labyrinth boss 41 which can correspond to the first labyrinth groove 202, the first labyrinth boss 41 is assembled in the first labyrinth groove 202 along the radial clearance, and the first labyrinth boss 41 and the first labyrinth groove 202 can prevent most of sand and dust from entering the gear box. Specifically, the first labyrinth boss 41 is a first annular labyrinth boss, and the first annular labyrinth boss protrudes inwards along the radial direction of the outer stationary ring 4, that is, the first labyrinth boss 41 is located on the inner wall of the outer stationary ring 4, and at least part of the first labyrinth boss 41 can extend into the first labyrinth groove 202, and this arrangement plays a role in primarily blocking dust and sand from entering the gearbox.

As shown in fig. 2, the outer stationary ring 4 is provided with a second labyrinth boss 43 and a third labyrinth boss 44 which are arranged at intervals, the oil slinger 2 is provided with a second labyrinth groove 203 and a third labyrinth groove 204, the second labyrinth boss 43 is assembled in the second labyrinth groove 203 along an axial gap, and the third labyrinth boss 44 is assembled in the third labyrinth groove 204 along the axial gap. A fourth labyrinth groove 401 is formed between the second labyrinth boss 43 and the third labyrinth boss 44, a fourth labyrinth boss 21 is formed between the second labyrinth groove 203 and the third labyrinth groove 204, and the fourth labyrinth boss 21 is fitted in the fourth labyrinth groove 401 along an axial gap.

Specifically, the second labyrinth boss 43 of the present embodiment is a second annular labyrinth boss, the third labyrinth boss 44 is a third annular labyrinth boss, the fourth labyrinth boss 21 is a fourth annular labyrinth boss, the second labyrinth groove 203 is a second annular labyrinth groove, the third labyrinth groove 204 is a third annular labyrinth groove, and the fourth labyrinth groove 401 is a fourth annular labyrinth groove.

As shown in fig. 2, a wedge groove 404 is provided on the inner side of the top end of the third labyrinth boss 44 of the present embodiment, and the additional wedge groove 404 enables the outer stationary ring 4 to be more smoothly assembled on the seal ring 3.

As shown in fig. 2, a fifth labyrinth boss 22 is formed between the seal groove 201 and the first labyrinth groove 202, a fifth labyrinth groove 402 capable of facing the fifth labyrinth boss 22 is arranged on the outer stationary ring 4, and the fifth labyrinth boss 22 and the fifth labyrinth groove 402 can further prevent external sand and dust from entering the gear box. Specifically, the fifth labyrinth boss 22 can effectively reduce the speed of wind entering the gear box from the outside, thereby reducing wind pressure and eventually reducing sand and dust entering the inside of the gear box.

Specifically, the communication channel formed between the first labyrinth boss 41 and the oil slinger 2 is an L-shaped channel, and the communication channel formed between the fifth labyrinth boss 22 and the outer stationary ring 4 is an L-shaped channel, so that the length of the communication channel for outside sand and dust to enter the gear box is increased, corners of the communication channel are more, the sealing performance of the sealing structure of the gear box is greatly improved, and the sealing structure of the gear box can be applied to vehicles running in a sand wind environment.

As shown in fig. 3, the bottom of the outer stationary ring 4 of the embodiment is provided with a sand discharge hole 403 which is communicated with the fifth labyrinth groove 402, once external sand and dust enter the fifth labyrinth groove 402, because the fifth labyrinth groove 402 is an annular groove, the sand and dust is gathered at the bottom of the fifth labyrinth groove 402 under the action of self gravity, and the sand and dust in the fifth labyrinth groove 402 can be discharged outwards in time by the additionally arranged sand discharge hole 403, so that the gathered sand and dust can be prevented from continuously entering the inside of the gear box to influence the normal use of the gear box.

As shown in fig. 1 and 3, the outer stationary ring 4 of the present embodiment is provided with a radial limit boss 42, and the radial limit boss 42 can abut against the box body 6 of the gearbox. Specifically, the radial limiting boss 42 can limit the outer stationary ring 4 to move in the radial direction of the outer stationary ring 4, thereby realizing the limiting of the outer stationary ring 4 in the radial direction.

The embodiment also provides a gear box, which comprises a gear shaft 1, a bearing 51, a box body 6 and the sealing structure of the gear box, wherein the sealing structure of the gear box is arranged between the box body 6 and the gear shaft 1, and the bearing 51 is sleeved on the gear shaft 1. It should be noted that, the gear shaft 1 of this embodiment may be a gear input shaft or a gear output shaft, which is specifically selected according to actual needs.

The gear box provided by the embodiment has the characteristics of good sealing effect, long service life and wide applicability.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. A sealing structure of a gear box, comprising:

the oil slinger (2) can be sleeved on a gear shaft (1) of the gear box, one end of an inner ring of a bearing (51) on the gear shaft (1) is abutted with the oil slinger (2), and a sealing groove (201) is formed in the outer wall of the oil slinger (2);

the sealing device comprises a sealing ring (3), wherein the sealing ring (3) is arranged in a sealing groove (201), both ends of the sealing ring (3) are free ends, at least part of the inner wall of the sealing ring (3) is in contact with the sealing groove (201), and at least part of the inner wall of the sealing ring (3) is arranged at intervals with the sealing groove (201);

the outer stationary ring (4), outer stationary ring (4) radially supports tightly sealing ring (3) just outer stationary ring (4) with oil slinger (2) clearance sets up.

2. The sealing structure of a gear box according to claim 1, characterized in that one end of the oil slinger (2) is provided with a first labyrinth groove (202) arranged along the circumferential direction of the oil slinger, the outer stationary ring (4) is provided with a first labyrinth boss (41) which can correspond to the first labyrinth groove (202), and the first labyrinth boss (41) is assembled in the first labyrinth groove (202) along the radial clearance.

3. The sealing structure of a gear box according to claim 2, characterized in that a second labyrinth boss (43) and a third labyrinth boss (44) which are arranged at intervals are arranged on the outer stationary ring (4), a second labyrinth groove (203) and a third labyrinth groove (204) are arranged on the oil slinger (2), the second labyrinth boss (43) is assembled in the second labyrinth groove (203) along an axial clearance, and the third labyrinth boss (44) is assembled in the third labyrinth groove (204) along the axial clearance.

4. A sealing arrangement of a gearbox according to claim 3, characterised in that a fourth labyrinth groove (401) is formed between the second labyrinth boss (43) and the third labyrinth boss (44), a fourth labyrinth boss (21) is formed between the second labyrinth groove (203) and the third labyrinth groove (204), the fourth labyrinth boss (21) fitting in the fourth labyrinth groove (401) along an axial gap.

5. A sealing structure of a gearbox according to claim 3, characterized in that a fifth labyrinth boss (22) is formed between the sealing groove (201) and the first labyrinth groove (202), and a fifth labyrinth groove (402) capable of facing the fifth labyrinth boss (22) is arranged on the outer stationary ring (4).

6. The sealing structure of the gear box according to claim 5, characterized in that the bottom of the outer stationary ring (4) is provided with a sand discharge hole (403) communicating with the fifth labyrinth groove (402).

7. A sealing arrangement of a gearbox according to claim 3, characterised in that the inner side of the top end of the third labyrinth boss (44) is provided with a wedge-shaped groove (404).

8. The sealing structure of a gear box according to claim 1, characterized in that the sealing structure of the gear box further comprises an oil retainer (52) sleeved on the gear shaft (1), the oil retainer (52) is abutted against one end of an inner ring of the bearing (51) deviating from the oil retainer (2), and the oil retainer (52) is fixedly arranged on the gear shaft (1).

9. The sealing structure of the gear box according to claim 1, characterized in that a radial limiting boss (42) is arranged on the outer stationary ring (4), and the radial limiting boss (42) can be abutted with a box body (6) of the gear box.

10. A gear box, characterized by comprising a gear shaft (1), a bearing (51), a box body (6) and a sealing structure of the gear box according to any one of claims 1 to 9, wherein the sealing structure of the gear box is arranged between the box body (6) and the gear shaft (1), and the bearing (51) is sleeved on the gear shaft (1).

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