CN108757908B

CN108757908B - Low-noise differential mechanism

Info

Publication number: CN108757908B
Application number: CN201810949930.XA
Authority: CN
Inventors: 程世元
Original assignee: Chongqing Bishan District Longxiang Machinery Co ltd
Current assignee: Chongqing Bishan District Longxiang Machinery Co ltd
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2020-07-28
Anticipated expiration: 2038-08-20
Also published as: CN108757908A

Abstract

The invention belongs to the technical field of differentials, and particularly relates to a low-noise differential. The lubricating device comprises a left lubricating cavity, a right lubricating cavity and a lower lubricating cavity, wherein the left lubricating cavity and the right lubricating cavity are oppositely arranged and are respectively arranged beside a second through hole; the tip of left and right lubricated cavity is equipped with respectively with the lubricated package of cavity intercommunication separately, lubricated package top all is equipped with the flexible tube, the flexible tube extends to the planetary gear top, the free end of flexible tube is equipped with the oil-out. The invention completely subverts the lubricating structure of the existing differential, can solve the problem of insufficient lubrication of the joints of the planetary gears by utilizing the structure and avoids generating larger noise.

Description

Low-noise differential mechanism

Technical Field

The invention belongs to the field of differentials, and particularly relates to a low-noise differential.

Background

A differential is a differential mechanism which enables the transmission of a rotary motion from one shaft to two shafts and enables the latter to rotate at different rotational speeds relative to each other. The automobile differential is a main part of a drive axle and has the function of allowing the half shafts on the two sides to rotate at different rotating speeds while transmitting power to the half shafts on the two sides, so that wheels on the two sides can run in a pure rolling mode at unequal distances as far as possible, and the friction between tires and the ground is reduced.

Various gears inside the existing differential are meshed with each other, and the meshing of a main transmission gear, a planetary gear and the like exist. The structure is too complicated, each gear meshing needs a certain amount of lubricating oil, and the total amount of the required lubricating oil is large due to the excessive number of gear meshing groups, but the existing differential cannot provide a large amount of lubricating oil. The lubricating system in the existing differential mechanism is complex in structure, and the lubricating oil can fully flow into each meshing part while each gear needs to be avoided, so that the gears are guaranteed to be meshed smoothly, the abrasion among the gears is reduced, and the noise during meshing is reduced. For example: patent publication No. CN104633070B discloses a car differential lubrication structure that can form turn to and axial lubrication passageway, include the derailleur case that is enclosed by derailleur casing and clutch housing, the derailleur incasement is equipped with differential housing, differential ring gear and oil blocking cover, clutch housing is equipped with first support through-hole, the one end of differential housing is connected in first support through-hole through first differential bearing rotation, the oil blocking cover is established on differential housing, the oil blocking cover is located between differential ring gear and the first differential bearing, be equipped with a plurality of blend stops that extend the circumference along oil blocking cover axial on the surface of oil blocking cover, the oil blocking cover, form differential turn to lubrication passageway between differential ring gear and the derailleur case, enclose into a plurality of differential axial lubrication passageways between clutch housing, oil blocking cover and the blend stop. The problems of large oil quantity demand of lubricating oil, easy foam generation, short circulation time, poor power economy and large lubricating noise are solved.

Above-mentioned technical scheme only sets up lubricated passageway in differential mechanism axial, and oil shield and blend stop block the lubricating oil that splashes, and the oil groove adopts indiscriminate setting when the axial sets up, need reduce the setting even in radial and the narrow and small department in space. However, in the practical application process, it is found that the meshing position of the planetary gears inside the differential gear has an extreme lack of lubricating oil, because the remaining space is narrow and a large lubricating structure cannot be arranged, and even if an oil path exists, the position and the size of an oil groove are reduced to avoid all the planetary gears, so that the lubricating oil is not supplied enough or even cannot be continuously supplied all the time, and the planetary gears generate large noise due to large friction force during meshing.

The noise of the differential mechanism can be covered because the noise of the engine of the existing fuel automobile is high, so that the noise of the meshing part of the planetary gear of the differential mechanism is high and cannot be directly heard by a driver, and the overall influence is not high. However, for a new energy automobile, an engine is driven by a motor, the noise generated during the operation of the differential cannot be covered due to the small noise of the motor, and particularly, the meshing position of the planetary gear of the differential is the main part for emitting the noise, so that only a lubricating structure can be improved to reduce the noise under the condition that the structure of the differential cannot be changed.

Disclosure of Invention

The invention provides a low-noise differential, which aims to solve the problem that a large amount of noise is generated due to excessive friction when a planetary gear is meshed because the meshing position of the planetary gear in the existing differential is extremely lack of lubricating oil.

In order to solve the technical problem, the invention provides the following technical scheme that the low-noise differential mechanism comprises a shell and a planetary gear, wherein the planetary gear is arranged in the shell, the shell is provided with a first through hole for a half shaft to pass through and a second through hole for the planetary gear to pass through with a rotating shaft, the low-noise differential mechanism also comprises a left lubricating chamber, a right lubricating chamber and a lower lubricating chamber which are longitudinally arranged along the inner surface of the shell, the left lubricating chamber and the right lubricating chamber are oppositely arranged and are respectively arranged at the sides of the second through hole, the lower lubricating chamber is positioned between the left lubricating chamber and the right lubricating chamber, one end of the lower lubricating chamber is simultaneously communicated with the left lubricating chamber and the right lubricating chamber, the other end of the lower lubricating chamber is transversely provided with a push plate, the; the end parts of the left lubricating chamber and the right lubricating chamber are respectively provided with a lubricating bag communicated with the respective chamber, the top parts of the lubricating bags are respectively provided with a flexible pipe, the flexible pipes extend to the upper part of the planetary gear, and the free ends of the flexible pipes are provided with oil outlets; the surface of the lower lubricating chamber close to the planet gear is an inwards concave arc-shaped surface, a first oil groove penetrating through the surface is longitudinally arranged on the surface, and a one-way valve is arranged on the first oil groove; the left lubricating cavity, the right lubricating cavity and the lower lubricating cavity are filled with lubricating oil, and the planetary gear one-way valve enables the lubricating oil to enter the lower lubricating cavity from the lower lubricating cavity.

According to the basic principle of the scheme, in the working process, the direction of the central line of the second through hole is transverse, and the direction of the central line of the first through hole is longitudinal. Linear motor drives the push pedal and removes, and the lubricating oil in the lubricated cavity under the push pedal extrusion makes lubricating oil gush into left and right lubricated cavity from lubricated cavity down, promotes lubricating oil and wraps the oil-out discharge of flexible pipe from the lubrication, and on discharged lubricating oil fell into planetary gear, lubricated planetary gear when the meshing. Then lubricating oil drops to lubricated cavity upper surface down from planetary gear, gets into down again through leading to the groove in the lubricated cavity, and the push pedal moves once more and promotes lubricating oil and moves once more. The linear motor drives the push plate to move and retreat in a reciprocating mode, so that lubricating oil circularly flows to the planetary gear, and the meshing of the planetary gear is lubricated continuously.

The beneficial effect of this scheme:

1. this scheme overturns current differential mechanism's lubricating structure completely, utilizes this structure can solve the lubricated insufficient problem in junction of planetary gear, avoids producing great noise.

2. This scheme simple structure, it is with low costs, lubricated cavity sets up in differential mechanism casing inside easily, does not influence the inside structure of differential mechanism casing simultaneously.

3. The scheme can not influence the original structural strength of the differential shell, and only needs to slightly increase the original size of the shell, so that the overall structure of the differential is unchanged.

Furthermore, a plurality of oil outlets are formed in the free end of the flexible pipe, and the oil outlets are in a water drop shape. Can increase flexible pipe oil drainage volume, lubricate planetary gear meshing department better like this, the oil-out of water droplet form can let lubricating oil be oil droplet form and drip in succession, and is lubricated even and in succession, avoids the oil-out once only to discharge too much lubricating oil and strikes planetary gear simultaneously, hinders planetary gear's motion.

Furthermore, the rubber layer is coated outside the push plate, so that the friction force between the push plate and the inner wall of the lower lubricating cavity is reduced, and the push plate moves more smoothly.

Further, the lower lubricating cavity upper surface is still transversely equipped with the second oil groove of the first oil groove of intercommunication, and second oil groove bottom surface slope sets up, and the bottom surface is lowest and first oil groove intercommunication. The planetary gear can throw lubricating oil off at the meshing and rotate the upper surface that scatters to lubricated cavity down with the centrifugation, owing to too dispersed, is not convenient for the recollecting of lubricating oil, so utilize the slope bottom surface of second oil groove can be faster to collect lubricating oil once more.

Further, the lubrication pack is located between the first through hole and the second through hole. From the shell structure, the space position is larger, and the arrangement of the lubricating bag is convenient.

Drawings

The invention is described in further detail below with reference to the following figures and detailed description:

FIG. 1 is a top view of the structure of embodiment 1 of a low noise differential;

FIG. 2 is a front view of the pusher plate of FIG. 1;

fig. 3 is a sectional view of a portion where the second oil groove communicates with the first oil groove in fig. 1.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the lubricating device comprises a shell 1, a planetary gear 2, a left lubricating chamber 3, a right lubricating chamber 4, a lower lubricating chamber 5, a first through hole 6, a second through hole 7, a push plate 8, a linear motor 9, a lubricating bag 10, a flexible pipe 11, an oil outlet 12, a first oil groove 13, a one-way valve 14 and a second oil groove 15.

As shown in fig. 1, 2 and 3: a low-noise differential mechanism comprises a shell 1 and a planetary gear 2, wherein the planetary gear 2 is arranged inside the shell 1, a first through hole 6 for a half shaft to pass through and a second through hole 7 for the planetary gear 2 to pass through with a rotating shaft are formed in the shell 1, the low-noise differential mechanism also comprises a left lubricating chamber 3, a right lubricating chamber 4 and a lower lubricating chamber 5 which are longitudinally arranged along the inner surface of the shell 1, the left lubricating chamber 4 and the right lubricating chamber 4 are oppositely arranged and are respectively arranged at the sides of the second through hole 7, the lower lubricating chamber 5 is positioned between the left lubricating chamber 4 and the right lubricating chamber 4, the lower end of the lower lubricating chamber 5 is simultaneously communicated with the left lubricating chamber 4 and the right lubricating chamber 4, the upper end of the lower lubricating chamber 5 is transversely provided with a push plate 8, the push plate 8 is; the end parts of the left lubricating chamber 4 and the right lubricating chamber 4 are respectively provided with a lubricating bag 10 communicated with the respective chambers, the top parts of the lubricating bags 10 are respectively provided with a flexible pipe 11, the flexible pipes 11 extend to the upper part of the planetary gear 2, the free ends of the flexible pipes 11 are provided with oil outlets 12, and the oil outlets 12 face the planetary gear 2; the surface of the lower lubricating chamber 5 close to the planetary gear is an inwards concave arc-shaped surface, a first oil groove 13 penetrating through the surface is longitudinally formed in the surface, and a one-way valve 14 is arranged on the first oil groove 13; left side lubrication chamber 3, right lubrication chamber 4 and lubrication chamber 5 are inside all to be filled with lubricating oil down, and linear electric motor 9 drives push pedal 8 and promotes lubricating oil in lubrication chamber 5 down and gushes into left and right lubrication chamber 4, and lubricating oil drips into planetary gear 2 on from the oil-out 12 of flexible tube 11 on the lubrication package 10, and check valve 14 makes lubricating oil get into in the lubrication chamber 5 down from lubrication chamber 5 is outer. The free end of the flexible pipe 11 is provided with a plurality of oil outlets 12, and the oil outlets 12 are in a drop shape. The push plate 8 is coated with a rubber layer. The upper surface of the lower lubricating cavity 5 is also transversely provided with a second oil groove 15 communicated with the first oil groove 13, the bottom surface of the second oil groove 15 is inclined, and the lowest part of the bottom surface is communicated with the first oil groove 13. The lubrication pack 10 is located between the first through hole 6 and the second through hole 7.

During working, the second through hole 7 is in the transverse direction along the central line direction and the first through hole 6 is in the longitudinal direction along the central line direction. Left side lubrication chamber 3, right side lubrication chamber 4 and lower lubrication chamber 5 are inside all to be filled with lubricating oil, linear electric motor 9 drives push pedal 8 and removes, lubricating oil in lubrication chamber 5 under the push pedal 8 extrudees, make lubricating oil gush into left and right lubrication chamber 4 from lower lubrication chamber 5, the lubricating oil that newly gushes into extrudes left and right lubrication chamber 4, promote lubricating oil and discharge from the oil-out 12 of flexible tube 11 on the lubrication package 10, discharged lubricating oil falls into on planetary gear 2, lubricate planetary gear 2 motion. Then the oil drops from planetary gear 2 to lower lubrication chamber 5 upper surface, gets into lower lubrication chamber 5 again through logical groove, and push pedal 8 moves once more and promotes lubricating oil and moves once more. The linear motor 9 drives the push plate 8 to move and retreat in a reciprocating mode, so that lubricating oil circularly flows to the planetary gear 2 to lubricate the meshing of the planetary gear 2. The check valve 14 enables the lubricating oil to enter the lower lubricating chamber 5 from the outside of the lower lubricating chamber 5 and only can be led to pass through, and the lubricating oil is prevented from being extruded and overflowing.

This scheme overturns current differential mechanism's lubricating structure completely, utilizes this structure can solve planetary gear 2's lubricated insufficient problem in the department of closing, avoids producing great noise. This scheme simple structure, it is with low costs, lubricated cavity sets up in differential mechanism casing 1 inside easily, does not influence the inside structure of differential mechanism casing 1 simultaneously. The scheme can not influence the original structural strength of the differential case 1, and only needs to slightly increase the original size of the case 1.

Increase casing 1's volume slightly in this scheme, 1 inner structure of casing is unchangeable, reduces the volume setting of lubricating structure originally, does not occupy the space of moving between each part, is convenient for lubricate on the contrary like this. The free end of the flexible pipe 11 is provided with a plurality of oil outlets 12, and the oil outlets 12 are in a drop shape. Can increase flexible tube 11 oil extraction volume, can lubricate planetary gear 2 meshing department better, the oil-out 12 of water droplet form can let lubricating oil drip in succession, and is lubricated even and continuous, avoids oil-out 12 once only to discharge more lubricating oil and strikes planetary gear 2 simultaneously, hinders planetary gear 2's motion. The push plate 8 is coated with a rubber layer, so that the friction between the push plate 8 and the inner wall of the lower lubricating chamber 5 is reduced, and the push plate 8 moves more smoothly. The upper surface of the lower lubricating cavity 5 is also transversely provided with a second oil groove 15 communicated with the first oil groove 13, the bottom surface of the second oil groove 15 is inclined, and the lowest part of the bottom surface is communicated with the first oil groove 13. The planetary gear 2 centrifugally throws out the lubricating oil to the upper surface of the lower lubricating chamber 5 during the meshing rotation, and the lubricating oil is not easily collected again due to the excessive scattering, so that the lubricating oil can be collected again more quickly by the inclined bottom surface of the second oil groove 15. The lubrication pack 10 is located between the first through hole 6 and the second through hole 7. The spatial position is relatively large here in view of the structure of the housing 1, which facilitates the arrangement of the lubrication package 10.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various changes and modifications without departing from the structure of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.

Claims

1. A low-noise differential mechanism comprises a shell and a planetary gear, wherein the planetary gear is arranged in the shell, and the shell is provided with a first through hole for a half shaft to pass through and a second through hole for the planetary gear to pass through with a rotating shaft; the end parts of the left lubricating chamber and the right lubricating chamber are respectively provided with a lubricating bag communicated with the respective chamber, the top parts of the lubricating bags are respectively provided with a flexible pipe, the flexible pipes extend to the upper part of the planetary gear, the free ends of the flexible pipes are provided with oil outlets, and the oil outlets face the planetary gear; the surface of the lower lubricating chamber, which is close to the planet gear, is an inwards concave arc-shaped surface, a first oil groove penetrating through the surface is longitudinally arranged on the surface, and a one-way valve is arranged on the first oil groove; lubricating oil is filled in the left lubricating cavity, the right lubricating cavity and the lower lubricating cavity, and the lubricating oil enters the planetary gear in the lower lubricating cavity from the outside of the lower lubricating cavity through the one-way valve; the upper surface of the lower lubricating cavity is also transversely provided with a second oil groove communicated with the first oil groove, the bottom surface of the second oil groove is obliquely arranged, and the lowest part of the bottom surface is communicated with the first oil groove.

2. The low noise differential according to claim 1, wherein the free end of the flexible tube is provided with a plurality of oil outlets, and the oil outlets are in the form of drops.

3. The low noise differential according to claim 1, wherein said push plate is coated with a rubber layer.

4. The low noise differential of claim 1, wherein the lubrication pack is located between the first and second through holes.