CN201739474U - Reduction gearbox - Google Patents

Abstract

The utility model relates to a reduction gearbox which belongs to the technical field of railway vehicle traction gear driving device. The reduction gearbox comprises a gearbox body and a rack wheel shaft hole is machined on the outer side of the gearbox body; the rack wheel shaft hole is integrally step-shaped, and the inner segment aperture is more than the outer segment aperture; at least two sealing grooves capable of forming sealing labyrinth with the corresponding structures of a rack wheel shaft are respectively machined in the inner segment and the outer segment; a concave part which tilts downwards and faces the interior of the gearbox body is formed on the lower part of the rack wheel of the gearbox body, and the deepest position of the concave part reaches the lower side of the utmost sealing groove of the rack wheel shaft hole; at least a vertical hole communicated with the concave part is machined on the lower position of each sealing groove. Therefore, lubricant enters the sealing grooves to smoothly flow to the tilted concave part through the vertical holes, and then flows back to the gearbox without affecting the sealing performance of the sealing grooves. Besides, the tilted concave part can be cast during the forming of gearbox, a drill boom can directly extend to the rack wheel shaft hole to drill vertical holes without other tools and is very convenient in operating, and the reduction gearbox is applicable to light rail subways and railway vehicles with velocity lower than 160km/h.

Description

Reduction gear box

Technical field

The utility model relates to a kind of reduction gear box, and especially a kind of improvement of gear-box oil return structure belongs to rail truck traction gear technical field of driving.Be mainly used in the following rail truck of subway, light rail and 160Km/h speed.

Background technique

Reduction gear box is the vital part of rail truck traction gear drive unit, and its quality good or not directly has influence on the operational situation and the life-span of retarder.In train travelling process, lubricant oil can be along axletree slowly infiltration outside deceleration box of rotation, lubricant oil can gather in the sealing labyrinth simultaneously, if lubricant oil is flowed back in the speed reducer, will leak gradually, finally because of lacking bearing, the gear damage that lubricant oil causes speed reducer inside.This obviously is definitely unallowed.

For a long time, the reduction gear box of rail truck traction gear drive unit as depicted in figs. 1 and 2, the outside of casing 2 is shaped on gearwheel axis hole 3, this gearwheel axis hole integral body is stepped, the inner segment aperture is shaped on the groove of two seals at least that forms the sealing labyrinth with the Large Gear Shaft During counter structure greater than outer sector hole footpath respectively in inner segment and the outer section.Oil return structure wherein is: process the drainage inclined-plane 4 that ecto-entad tilts between outer section of gearwheel axis hole and the inner segment, thereby as having opened downward-sloping irrigation canals and ditches in the casing, the lubricant oil that can accumulate in the seal groove is introduced box house.

Yet facts have proved that the gradient of above-mentioned plane of inclination is limited, oil return speed is slow; And owing to can't therefore can not always there be a spot of lubricant oil to be deposited in the seal groove by the lowest part of all seal grooves with the lubricant oil total reflux in the seal groove to box house.In addition, the plane of inclination makes seal groove fracture occur, thus deterioration sealing effect.The processing of plane of inclination is installed on the Milling machineshorizontal and mills out processing difficulties after need making casing inclination several angle by frock.

Retrieval is found, application number is that 03131680.8 Chinese patent application discloses a kind of seal arrangement that is specially adapted to adopt the bullet train power car driving gearbox of oil lubrication, has contactless labyrinth seal mechanism, and the inner chamber that leads to casing by the drainback passage that sealing mechanism is drawn, and in drainback passage, be provided with the oil return buffer cavity with it, the outlet port of final spill port is located at below the internal memory lubricant oil pasta line of oil sump of casing, and final spill port makes oil return buffer cavity and oil sump connect.It is comparatively complicated that this structure seems, need cast out a cavity at the outer wall of gear housing, makes the inner chamber of this cavity and gear-box main body couple together with method for processing again.During oil return, lubricant oil flows to cavity earlier and flows back to inside, gear-box master chamber again.Owing to increased exocoel, it is complicated that casting and machining become, and owing to increased exocoel, must take seal approach to exocoel.

Secondly, application number is the self-scavenging hybrid lubrication subsystem that 95193561.5 Chinese patent discloses a kind of main transmission gearbox, comprise an oil sump that becomes this gear-box overall structure extension part, make the dynamic Liquid Surface of the lubricant medium in the oil sump exceed the distance that gear-box bottom one is scheduled to, the radially discontinuous nozzle entry that defines between columnar portion and throat, this inlet flows to another oil sump with higher liquid level by the lubricant medium that the jet pipe guiding is collected in the gear-box bottom.Lubricant medium in this runner of interaction partners between the gear-box sidewall of rotational circle annular planet supporting disk and structural modification applies a viscosity pump function, lubricant medium is flowed through therebetween, and be transported to higher liquid level through jet pipe.This structure has increased by two oil back chambers outside main box body and has connected these two chamber drainback passages and jet etc., and structure is more complicated, has not only increased casting, mechanical processing difficulty, and has increased the sealability requirement in chamber.

In addition, application number is that 03245745.6 Chinese utility model patent discloses a kind of flexible compound gear-box, comprise upper box, lower box, there is the top box that is split-type structural with casing to heal up between last lower box and nowel heals up, top box heals up and upper box, nowel heal up and lower box between all adopt the groove of mutual wedging and flange nested against one another, groove and flange that mutually nested cooperation is also arranged between last nowel heals up, top box heals up and nowel heals up all adopts the macromolecule engineering material to make, on the eckband arc surface that last nowel heals up, be equipped with oil-return groove, the eckband arc surface that nowel heals up is provided with spill port, the nowel that is positioned at box inside heals up and also is located at main oil-return groove on the eckband, and the inner of spill port communicates with main oil-return groove.This structure is also comparatively complicated, and need adopt macromolecular materials such as nylon.Owing on the flask joint of casing, also processed drainback passage, increased the cost of machining, and the requirement of flask joint sealing has also been improved.Owing to need process some grooves on the circumferential surface in gear-box hole, and then in the hole that the axial processing of groove runs through these grooves and tilts in gear housing, difficulty of processing is big, and the special frock of needs be processed the hole that these run through groove.

The model utility content

The purpose of this utility model is: the problem at above-mentioned prior art exists proposes the reduction gear box that a kind of oil return is satisfactory for result, do not influence sealing effect and good manufacturability.

In order to reach above purpose, reduction gear box of the present utility model comprises casing, and the outside of described casing is shaped on the gearwheel axis hole; Described gearwheel axis hole integral body is stepped, and the inner segment aperture is greater than outer sector hole footpath; Be shaped on the groove of two seals at least that forms the sealing labyrinth with the Large Gear Shaft During counter structure respectively in described inner segment and the outer section; Described casing is positioned at bottom, gearwheel hole and forms towards the downward-sloping depression of casing, and the below of gearwheel Kongzui external sealed groove is arrived in the bosom of described depression; The lower of described each seal groove is shaped at least one return port that is communicated with described depression.Obviously this return port is preferably upright opening, promptly perpendicular to the gearwheel axis hole.

Like this, the lubricant oil that flows into seal groove can in time waltz through upright opening and flow to depression, is back in the casing again, can not accumulate in the seal groove.And no matter be tilt depression or upright opening, can not influence the sealing of seal groove.In addition, the depression that tilts can be shaped at casing casting is formed, and the brill system of upright opening need not by frock, can directly drill boom be stretched into the system of boring in the gearwheel axis hole, and is very convenient.

Especially what deserves to be mentioned is, in the process of gear rotation, in fact the inclination depression that casing is positioned at bottom, gearwheel hole has formed a negative pressure cavity, then form the malleation chamber in the seal groove, because upright opening has connected malleation chamber and negative cavity, therefore make that the lubricant oil in the seal groove refluxes rapidly, this not merely is that drainage and the structure with the effect of desirable suction stream not only make backflow very smooth and easy, and has effectively strengthened the sealing of seal groove.This shows that the utility model compared with prior art has outstanding substantive distinguishing features and obvious improvement.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the reduction gear tank drainback structural representation of existing rail truck traction gear drive unit.

Fig. 2 is an embodiment's of the utility model a structural representation.

Fig. 3 is that the A of Fig. 1 is to partial view.

Fig. 4 is that the A of Fig. 2 is to partial view

Fig. 5 is the structural representation after the assembling of Fig. 2 embodiment gearwheel.

Embodiment one

The reduction gear box of present embodiment as shown in Figure 3 and Figure 4, the outside of casing 2 is shaped on gearwheel axis hole 3.Gearwheel axis hole integral body is stepped, and the inner segment aperture is greater than outer sector hole footpath.Be shaped on multiple-sealed groove 5 respectively in inner segment and the outer section.As shown in Figure 5, these seal grooves are after Large Gear Shaft During 1 assembling, and the protruding structure corresponding with Large Gear Shaft During 1 forms the sealing labyrinth.The bottom that casing 2 is positioned at gearwheel axis hole 3 forms towards the downward-sloping depression 6 of casing, the lower surface of this depression is the inclined-plane of tilt about 45 ° (can 30-60 ° of scope), upper surface is carried out the transition to the inclined-plane parallel with lower surface and is constituted by the plane of depression depths, is convenient to boring like this.The below of gearwheel axis hole 3 outermost seal grooves is arrived in the depression bosom.The lower of each seal groove be shaped on respectively four with the depression 6 upright openings that are communicated with 7.

After the assembling, as shown in Figure 5, the protruding part on the Large Gear Shaft During 1 inserts the seal groove of casing 2, has only very little gap each other, forms typical labyrinth seal structure.When gearwheel is driven when running, the lubricant oil of box house can produce the trend of slowly oozing out outside casing, and seal groove plays and stops that lubricant oil is directly to the effect of casing exosmosis.The lubricant oil that is blocked deposits in seal groove, and waltzs through upright opening and flow to the depression that tilts, and is back in the casing again, can not accumulate in the seal groove.Especially, in the process of gear rotation, because air is with the gearwheel rotational flow in the casing, therefore the casing inclination depression that is positioned at gearwheel axis hole bottom becomes the negative pressure cavity, then forms relative malleation chamber in the seal groove, as a result in the seal groove lubricant oil of deposition except deadweight refluxes, in fact sucked back casing rapidly by upright opening, compared with prior art, the backflow effect is very remarkable, has effectively strengthened the sealing of seal groove.

During the processing upright opening, gear housing is fixed on the drilling machine, aims at minimum bore position boring and get final product, on common vertical drilling machine, just can finish, need not frock.As can be seen from Figure 5, owing to be boring, do not destroy the continuity of seal groove, so its sealing effect has obtained practical assurance.

In addition to the implementation, the utility model can also have other mode of executions.For example, return port is also nonessential to be vertical, and the shape in hole also is not limited to cylindrical hole, and the shape of depression can be revised according to box shape and casting technique.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims (4)

1. a reduction gear box comprises casing, and the outside of described casing is shaped on the gearwheel axis hole; Described gearwheel axis hole integral body is stepped, and the inner segment aperture is greater than outer sector hole footpath; Be shaped on the groove of two seals at least that forms the sealing labyrinth with the Large Gear Shaft During counter structure respectively in described inner segment and the outer section; It is characterized in that: described casing is positioned at bottom, gearwheel hole and forms towards the downward-sloping depression of casing, and the below of gearwheel Kongzui external sealed groove is arrived in the bosom of described depression; The lower of described each seal groove is shaped at least one return port that is communicated with described depression.

2. reduction gear box according to claim 1 is characterized in that: described return port is perpendicular to the gearwheel axis hole.

3. reduction gear box according to claim 2 is characterized in that: the lower surface of described depression is inclination 30-60 ° inclined-plane.

4. reduction gear box according to claim 3 is characterized in that: the upper surface of described depression is carried out the transition to the inclined-plane parallel with lower surface and is constituted by the plane of depression depths.

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