CN112081900A

CN112081900A - Gear box sealing device

Info

Publication number: CN112081900A
Application number: CN202010839503.3A
Authority: CN
Inventors: 陈宇向; 姜宇飞; 潘喻; 刘世博
Original assignee: Zhuzhou Jiufang Equipment Driving Technology Co ltd; ZHUZHOU GOFRONT EQUIPMENT CO LTD
Current assignee: Zhuzhou Jiufang Equipment Driving Technology Co ltd; ZHUZHOU GOFRONT EQUIPMENT CO LTD
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2020-12-15

Abstract

The utility model provides a gear box sealing device, belongs to track traffic technical field, including seal structure, seal structure includes non-contact labyrinth seal, contact seal, guiding gutter and outside seal, non-contact labyrinth seal sets up in the bearing outside of gear box, contact seal seals the labyrinth groove end of non-contact labyrinth seal, contact seal is compressed tightly by the gland axial, and is laminated with non-contact labyrinth seal, there is the clearance between gland and the non-contact labyrinth seal, forms outside seal, the inboard cavity of outside seal forms the guiding gutter, the gland is equipped with the apopore with the guiding gutter intercommunication. The invention has multiple sealing structures, compact structure, small required space, good sealing effect due to the synergistic effect of labyrinth seal, contact seal, outer side seal and water chute.

Description

Gear box sealing device

Technical Field

The invention belongs to the technical field of rail transit, and particularly relates to a gearbox sealing device.

Background

The rail transit industry is in a high-speed development period, particularly urban rail transit and high-speed rails are in a rapid growth trend, and the gear box is used as a key part of a vehicle bogie and used for transmitting load, transmitting the torque of a traction motor to a wheel set through a certain transmission ratio, providing forward power for a vehicle, having a vital influence on the running safety and reliability of the vehicle, and therefore, providing a higher requirement for the reliability of the gear box.

The gear box all adopts oil lubrication, is dynamic seal between rotating member and the box, generally adopts non-contact labyrinth seal scheme, and the function that needs to have makes the interior lubricating oil of gear box not leak, prevents external pollutant's entering simultaneously, provides good operational environment for gear box inside. When the gear box runs, lubricating oil circulates in the gear box under the stirring of the gears, and the lubricating oil can be atomized into a relatively thick oil-liquid mixture to fill the interior of the gear box due to the high rotating speed of the gears. Because the sealing scheme used at present is non-contact, and gaps exist among mazes, the gear box has the phenomena of oil leakage, blackening of lubricating oil, invasion of external pollutants and the like in different degrees in application, so that the lubricating performance of the gear box is reduced, and the service life of gears and bearings is seriously influenced. When the vehicle is maintained, the gear box is flushed by water, and water can enter from the sealing part, so that lubricating oil is emulsified, and the performance of the gear box is reduced.

Disclosure of Invention

Aiming at the technical problem, the invention discloses a gear box sealing device which mainly aims at improving the sealing performance of a gear box, solving the problem of oil leakage and completely preventing external pollutants from invading the interior of the gear box from the structure.

The invention adopts the following specific technical scheme:

the utility model provides a gear box sealing device, includes seal structure, seal structure includes non-contact labyrinth seal, contact seal, guiding gutter and outside seal, non-contact labyrinth seal sets up in the bearing outside of gear box, contact seal seals the labyrinth groove end of non-contact labyrinth seal, contact seal is compressed tightly by the gland axial, and is laminated with non-contact labyrinth seal, there is the clearance between gland and the non-contact labyrinth seal, forms the outside seal, outside seal inboard cavity forms the guiding gutter, the gland is equipped with the apopore with the guiding gutter intercommunication.

Preferably, the non-contact labyrinth seal comprises a labyrinth ring and a labyrinth outer end cover, the labyrinth ring is fixedly arranged on the axle in an interference manner, one end of the labyrinth outer end cover is arranged on the end face of the gear box, and the other end of the labyrinth outer end cover and the labyrinth ring form a labyrinth seal with labyrinth grooves engaged in a staggered manner.

Preferably, the outer circular surface of the labyrinth ring is hardened and ground, and when the labyrinth ring rotates, the outer circular surface of the labyrinth ring is always in contact with the contact type sealing surface to form dynamic sealing.

Preferably, an oil return cavity is formed between the non-contact labyrinth seal and the bearing, and an oil return channel is arranged at the lower part of the oil return cavity and communicated with the inside of the gear box.

Preferably, the contact type seal comprises a contact sealing piece and a labyrinth ring, and is tightly attached to the labyrinth outer end cover of the non-contact type labyrinth seal.

Preferably, the contact sealing element contains an inner circular lip and an outer circular lip, the inner circular lip is in surface contact with the outer circle of the labyrinth ring, and the outer lip is attached to the gland.

Preferably, the contact sealing element is made of a high polymer material with a self-lubricating function.

Preferably, the gland is fixedly connected with the labyrinth outer end cover through a fastener.

Preferably, the gland has a small gap with the outer circle surface of the labyrinth ring of the non-contact labyrinth seal to form an outer seal, and the outer seal is used for blocking outside water or pollutants from entering.

Preferably, the gland and the empty groove between the two lips of the contact sealing element form a water chute for discharging the outside water and pollutants entering the water chute from the water outlet hole at the bottom of the gland.

The invention has the beneficial effects that:

(1) the invention has multiple sealing structures, compact structure, small required space, good sealing effect due to the synergistic effect of labyrinth seal, contact seal, outer side seal and water chute;

(2) the contact sealing element is made of a high polymer material with a self-lubricating function, so that the lubricating performance is good, the lip has large deformation, abrasion compensation amount can be provided after abrasion is used, the sealing performance is continuously ensured, the service life is long, and the use requirement is met;

(3) the labyrinth ring is arranged on the shaft, the outer circular surface of the labyrinth ring is a contact sealing friction surface, and the labyrinth ring can be replaced after being worn, so that the shaft is protected from being worn.

Drawings

FIG. 1 is a schematic view of a gearbox seal arrangement according to the present invention;

fig. 2 is an enlarged view of a portion of the sealing structure of fig. 1.

1. A gear housing; 2. a bearing; 3. an axle; 4. a sealing structure; 5. a labyrinth ring; 6. a contact seal; 7. a water chute; 8. a gland; 8-1, water outlet holes; 9. a labyrinth outer end cover; 10. an oil return chamber.

Detailed Description

The invention is further illustrated by the following specific examples. The starting materials and methods employed in the examples of the present invention are those conventionally available in the market and conventionally used in the art, unless otherwise specified.

Example 1

As shown in FIG. 1, the present embodiment discloses the components of the sealing device structure of the gear box, and the sealing device 4 is installed on the end surface of the gear box 1 and the outer side of the bearing 2, and is in interference fit with the axle 3.

As shown in fig. 2, the sealing device 4 includes a labyrinth ring 5, a labyrinth outer end cover 9, a contact seal 6, a water chute 7, and a gland 8, and forms a multi-layer sealing structure from inside to outside, that is: the non-contact labyrinth seal, the contact seal, the water chute 7 (the water outlet hole 8-1) and the outer side seal are compact in structure, each layer of seal structure has corresponding functions and mutual synergistic effect, the overall sealing performance is improved, a multi-layer seal structure is realized in a small space, and a good sealing effect is achieved.

A non-contact labyrinth seal comprises a labyrinth ring 5 and an outer labyrinth end cover 9, wherein the labyrinth ring 5 is arranged on an axle 3 in an interference manner, one end of the outer labyrinth end cover 9 is arranged on the end surface of a gear box body 1, labyrinth grooves are meshed in a staggered manner, an oil return cavity 10 is formed between the labyrinth groove and a bearing 2, most of lubricating oil passing through the bearing 2 to the oil return cavity 10 directly returns to the interior of a gear box from an oil return channel at the bottom of the oil return cavity 10, part of the lubricating oil forms mist oil and enters labyrinth gaps to be attached to the surface of the labyrinth to form liquid drops, and the lubricating oil on the surface of the labyrinth is thrown into the oil return cavity 10 under the action of centrifugal force due to the rotation of the labyrinth ring 5, so that the labyrinth seal.

The contact seal is composed of a contact seal 6 and a labyrinth ring 5, wherein the labyrinth ring 5 is not only a component of the non-contact labyrinth seal, but also an outer circular surface and a contact friction surface of the contact seal (the requirement on roughness is high). The contact sealing element 6 is provided with two lips, the inner circular lip is in surface contact with the labyrinth ring 5 to form dynamic sealing, when the labyrinth ring 5 rotates, the inner circular lip of the contact sealing element 6 is always in contact with the outer circular surface of the labyrinth ring 5, and the bidirectional sealing effect is achieved, so that lubricating oil in the gear box can be prevented from leaking outwards, external water or pollutants can be prevented from entering the gear box, and the sealing performance is high; the outer circle lip of the contact sealing element 6 is attached to the gland 8, the gland 8 is fixedly connected with the outer end cover of the labyrinth through a fastener (screw), the contact sealing element 6 is pressed by the gland 8 in the axial direction, the contact sealing element 6 is made to block the end opening of the labyrinth groove of the non-contact labyrinth seal, and a sealing effect is achieved between the non-contact labyrinth seal and the non-contact labyrinth seal. The design of contact seal has increased gear box 1's sealing performance, solves the oil leak problem to inside preventing external pollutant from invading gear box 1 completely from structural, even water washing gear box can not cause the problem of intaking yet.

The outer circle surface of the labyrinth ring 5 is hardened, the hardness is more than 45HRC, the roughness is lower than Ra0.8 through a grinding process, the friction force and the heat productivity are reduced, and the labyrinth ring is not easy to wear. The contact seal piece 6 adopts the macromolecular material of taking the self-lubricating function, and the contact seal position also has good lubricated effect under the condition that lacks lubricating oil, and contact seal piece 6 has certain hardness, has high temperature resistance simultaneously, and the wearability is good, and the lip has great deflection in the design, can provide the wearing and tearing compensation volume after using the production wearing and tearing, continuously guarantees sealing performance, has prolonged life. The problem that the contact seal is easy to wear and has a short service life is solved by the design, and the labyrinth ring 5 can be replaced after being worn, so that the axle 3 is prevented from being worn by the contact seal 6.

The outside is sealed, comprises gland 8 and labyrinth ring 5, and gland 8 sets up less clearance with labyrinth ring 5, and its function is that the entering of most external water or pollutant is blocked to a small part, and a small part gets into through outside seal clearance, but can only get into guiding gutter 7.

The water chute 7 is a cavity formed by the labyrinth ring 5, the contact sealing element 6 and the gland 8, one or more water outlet holes 8-1 are formed in the bottom of the gland 8, and water or pollutants entering the water chute 7 are finally discharged from the water outlet holes 8-1.

Example 2

If the installation space is enough, the non-contact labyrinth seal and the contact seal in embodiment 1 can be designed as independent structures, the labyrinth ring 5 (the labyrinth ring in embodiment 1 has both the labyrinth groove and the contact surface for the contact seal 6) is not shared, and the two parts are combined.

Example 3

The non-contact labyrinth seal of the seal structure in embodiment 1 is removed, and a certain seal effect can be achieved by only retaining the contact seal and the outer side seal, and the sealing performance is superior to that of a seal device with only the non-contact labyrinth seal.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a gear box sealing device, includes seal structure, its characterized in that, seal structure includes non-contact labyrinth seal, contact seal, guiding gutter and outside seal, non-contact labyrinth seal sets up in the bearing outside of gear box, contact seal seals the labyrinth groove end of non-contact labyrinth seal, contact seal is compressed tightly by the gland axial, and is laminated with non-contact labyrinth seal, there is the clearance between gland and the non-contact labyrinth seal, forms outside seal, outside seal inboard cavity forms the guiding gutter, the gland is equipped with the apopore with the guiding gutter intercommunication.

2. A gearbox sealing device according to claim 1, wherein the non-contact type labyrinth seal comprises a labyrinth ring and an outer labyrinth end cover, the labyrinth ring is fixedly arranged on the axle in an interference fit mode, one end of the outer labyrinth end cover is arranged on the end face of the gearbox, and the other end of the outer labyrinth end cover and the labyrinth ring form a labyrinth seal with labyrinth grooves in a staggered meshing mode.

3. A gearbox sealing device according to claim 2, wherein the outer circular surface of the labyrinth ring is hardened and ground, and the outer circular surface of the labyrinth ring is always in contact with the contact type sealing surface to form a dynamic seal when the labyrinth ring rotates.

4. A gearbox sealing device according to claim 2, wherein an oil return cavity is formed between the non-contact labyrinth seal and the bearing, and an oil return channel is arranged at the lower part of the oil return cavity and communicated with the interior of the gearbox.

5. The gearbox sealing device of claim 1, wherein the contact seal comprises a contact seal and a labyrinth ring, and the contact seal is tightly attached to an outer labyrinth end cover of the non-contact labyrinth seal.

6. The gearbox seal arrangement of claim 5, wherein the contact seal includes an inner circular lip in contact with the labyrinth ring outer circular surface and an outer circular lip that engages the gland.

7. A gearbox sealing arrangement according to claim 5, characterised in that the contact seal is of a polymeric material with self-lubricating properties.

8. A gearbox sealing arrangement according to claim 1 or 6, characterised in that the gland is fixedly connected to the labyrinth outer end cover by fasteners.

9. A gearbox sealing arrangement as set forth in claim 8 wherein said gland presents a small clearance from the outer circumferential surface of the labyrinth ring of the non-contacting labyrinth seal to form an outboard seal for blocking the ingress of outside water or contaminants.

10. The gearbox seal assembly of claim 9 wherein the channel between the gland and the lip of the contact seal forms a gutter for draining ambient water and contaminants entering the gutter from the bottom outlet of the gland.