CN112728050A

CN112728050A - Coaxial planetary gear reducer with shell cooling function

Info

Publication number: CN112728050A
Application number: CN201911030193.4A
Authority: CN
Inventors: 刘树成; 郝守刚; 姚征; 刘鹏翔; 李进; 姜泽军
Original assignee: Changzhou Yikong Automotive Electronics Co ltd
Current assignee: Changzhou Yikong Automotive Electronics Co ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2021-04-30

Abstract

The embodiment of the invention discloses a coaxial planetary gear reducer with a shell for cooling. In this reduction gear, keep off the oil board through setting up the annular, make annular keep off the oil board and be connected the gap formation oil storage cavity between the wall, through set up the mode of breach and lower breach on annular oil board, make most lubricating oil stay in the oil storage cavity, the lower breach of sub-part lubricating oil under through the outer wall of annular oil board flows back to the oil storage groove, further make at coaxial type planetary gear reducer during operation, the oil mass of the lubricating oil in the oil storage groove of planet carrier stirring reduces, consequently, the oil stirring loss has been reduced, and simultaneously, make the resistance of the lubricating oil that each part of coaxial type planetary gear reducer received when the motion reduce, and the work efficiency has been improved, and also reduced the friction of each part of coaxial type planetary gear reducer and lubricating oil, it generates heat to have reduced coaxial type planetary gear reducer.

Description

Coaxial planetary gear reducer with shell cooling function

Technical Field

The invention relates to the technical field of speed reducers, in particular to a coaxial planetary gear speed reducer with a shell for cooling.

Background

At present, the lubricating oil of the planetary gear reducer is stored under the case, and when the planetary gear reducer operates, the carrier of the planetary gear reducer rotates and agitates the lubricating oil under the case, so that the lubricating oil splashes so as to lubricate the respective components in the case.

Because the lubricating oil that the planet carrier stirs is more, cause the oil stirring loss of planetary gear reducer very serious to the operating efficiency is lower because the resistance that receives lubricating oil results in when each part of planetary gear reducer moves, and each part of planetary gear reducer can lead to the planetary gear reducer to generate heat seriously with lubricating oil friction.

Disclosure of Invention

The invention provides a coaxial planetary gear reducer with a shell for cooling, which aims to reduce the oil stirring loss, improve the working efficiency and reduce the heat generation. The specific technical scheme is as follows:

in a first aspect, the invention provides a coaxial planetary gear reducer with a shell for cooling, which comprises a sun gear, a plurality of planetary gears, a planet carrier, a gear ring, an annular oil baffle and a shell;

the casing comprises a first chamber and a second chamber which are communicated with each other and are mutually connected through a connecting wall, the diameter of the first chamber is larger than that of the second chamber, the sun gear, the planet carrier, the gear ring and the annular oil baffle plate are coaxial, the axis of each planet gear is parallel to that of the sun gear, and the sun gear, the plurality of planet gears, the planet carrier, the gear ring and the annular oil baffle plate are all arranged in the first chamber;

the power input shaft is connected with the sun gear, the sun gear is externally meshed with the plurality of planetary gears, the plurality of planetary gears are in transmission connection with the planetary carrier, the planetary carrier is connected with the power output shaft, the power output shaft is installed in the second cavity, the plurality of planetary gears are internally meshed with the gear ring, the gear ring is fixedly installed on the inner wall of the first cavity, and an oil storage groove for storing lubricating oil is arranged below the inner wall of the first cavity and close to the planetary carrier;

the planet carrier is located to annular fender oiled-plate cover, the outer wall of annular fender oiled-plate with the inner wall clearance fit of first cavity, just annular fender oiled-plate fixed connection in the inboard of connecting the wall, annular fender oiled-plate with the gap between the connecting wall forms the oil storage cavity, the outer wall top of annular fender oiled-plate is provided with the breach, be provided with down the breach under the outer wall of annular fender oiled-plate, the size of going up the breach is greater than the size of breach down.

Optionally, a cooling oil passage is arranged on the outer side of the connecting wall.

Optionally, the above-mentioned coaxial planetary gear reducer of cooling of taking the shell still includes the breather plug, first cavity is close to the inner wall top of trapped fuel cavity is provided with the air vent, just the position of air vent is kept away from go up the breach, the breather plug install in the air vent.

Optionally, the coaxial planetary gear reducer with the shell cooling further includes a tapered roller bearing, the power output shaft is mounted in the second cavity through the tapered roller bearing, and an oil supply passage leading to the tapered roller bearing is arranged on the inner side of the connecting wall.

Optionally, the periphery of the gear ring is provided with a protrusion, the inner wall of the first cavity is provided with a clamping groove, and the gear ring is clamped into the clamping groove through the protrusion.

Optionally, the inner side of the connecting wall is provided with a plurality of first protruding bolt holes distributed at intervals in the circumferential direction around the center, the annular oil baffle plate is provided with a plurality of second bolt holes distributed at intervals in the circumferential direction around the center, and the first bolt holes are connected with the second bolt holes through bolts.

Optionally, the planet carrier includes a plurality of installation shafts, an axis of each installation shaft is parallel to an axis of the sun gear, and the plurality of planet gears are respectively installed on the plurality of installation shafts through bearings, wherein the number of the installation shafts is the same as the number of the planet gears.

Optionally, the number of the planetary gears is three.

Optionally, the number of the upper notches is four, and the number of the lower notches is one.

Optionally, the planet carrier and the power output shaft are integrally formed.

From the above, in the embodiment, the annular oil baffle is arranged, so that the gap between the annular oil baffle and the connecting wall forms the oil storage cavity, by arranging the upper notch and the lower notch on the annular oil baffle plate, most of the lubricating oil is remained in the oil storage cavity, a small part of lubricating oil flows back to the oil storage tank through a lower notch right below the outer wall of the annular oil baffle plate, so that when the coaxial planetary gear reducer works, the amount of the lubricating oil in the oil storage tank stirred by the planet carrier is reduced, so that the oil stirring loss is reduced, meanwhile, the resistance of lubricating oil on each component of the coaxial planetary gear reducer is reduced when the components move, the working efficiency is improved, and the friction between each component of the coaxial planetary gear reducer and lubricating oil is reduced, and the heat generation of the coaxial planetary gear reducer is reduced. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

The innovation points of the embodiment of the invention comprise:

1. through setting up the annular oil baffle, make annular oil baffle and the gap between the wall of being connected form the oil storage cavity, through the mode that sets up breach and lower breach on the annular oil baffle, make most lubricating oil stay in the oil storage cavity, the lower breach of less part lubricating oil under through the outer wall of annular oil baffle flows back to the oil storage groove, further make at coaxial type planetary gear reducer during operation, the oil mass of the lubricating oil in the oil storage groove of planet carrier stirring reduces, consequently, the oil stirring loss has been reduced, and simultaneously, make the resistance of the lubricating oil that each part of coaxial type planetary gear reducer received when the motion reduce, and the work efficiency is improved, and also reduced the friction of each part of coaxial type planetary gear reducer and lubricating oil, it generates heat to have reduced coaxial type planetary gear reducer.

2. Because the gap between the annular oil baffle plate and the connecting wall forms an oil storage cavity, and the cooling oil duct is arranged on the outer side of the connecting wall, the cooling oil duct is close to the oil storage cavity. And when the coaxial planetary gear reducer works, most of lubricating oil is remained in the oil storage cavity, and the lubricating oil in the oil storage cavity can not splash everywhere, so that more lubricating oil can be contacted with the cooling oil duct through the connecting wall in the oil storage cavity, the heat exchange efficiency is improved, and the cooling effect is further improved.

3. Because when coaxial-type planetary gear reducer during operation, what the planet carrier rotated and stirred is the lubricating oil in the oil storage groove, therefore the flow velocity of the lubricating oil in the oil storage cavity is lower, and the position of air vent is kept away from last breach, consequently, lubricating oil is difficult for leaking from the breather plug, has reduced the probability of breather plug oil leak.

4. Because the inner side of the connecting wall is provided with the oil supply duct leading to the tapered roller bearing, when the coaxial planetary gear reducer works, the lubricating oil in the oil storage cavity can convey the lubricating oil for the tapered roller bearing along the oil supply duct, and the normal work of the tapered roller bearing is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of some embodiments of the invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.

FIG. 1 is an angular cross-sectional schematic view of a shelled cooled coaxial planetary gear reducer provided in an embodiment of the invention;

FIG. 2 is a schematic cross-sectional view of an angle of a housing provided by an embodiment of the present invention;

FIG. 3 is a schematic view of an angle of the housing according to the present invention;

FIG. 4 is a schematic structural diagram of an annular oil baffle according to an embodiment of the present invention;

FIG. 5 is a schematic view of another angle of the housing according to the present invention;

fig. 6 is a schematic structural diagram of a cooling oil passage according to an embodiment of the present invention.

In fig. 1-6, 1 a sun gear, 2 a planet gear, 3 a planet carrier, 4 a ring gear, 5 an annular oil baffle, 51 a second bolt hole, 52 an upper notch, 53 a lower notch, 6 a shell, 61 a connecting wall, 611 a first bolt hole, 62 a first cavity, 63 a second cavity, 7 an oil storage cavity, 8 a cooling oil passage, 9 a vent plug, 10 a tapered roller bearing and 11 an oil supply oil passage.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the embodiments and drawings of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The embodiment of the invention discloses a coaxial planetary gear reducer with a shell for cooling, which can reduce the oil stirring loss, improve the working efficiency and reduce the heat generation. The following provides a detailed description of embodiments of the invention.

FIG. 1 is an angular cross-sectional schematic view of a shelled cooled coaxial planetary gear reducer according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of an angle of a housing provided by an embodiment of the present invention.

Referring to fig. 1, the coaxial planetary gear reducer with housing cooling according to the embodiment of the present invention includes a sun gear 1, a plurality of pinion gears 2, a carrier 3, a ring gear 4, an annular oil deflector 5, and a housing 6.

Referring to fig. 2, the housing 6 includes a first chamber 62 and a second chamber 63 communicating with each other and connected to each other by a connecting wall 61.

Since the sun gear 1, the plurality of pinion gears 2, the carrier 3, the ring gear 4, and the annular oil baffle 5 are all installed in the first chamber 62, the diameter of the first chamber 62 is large, and the diameter of the first chamber 62 is larger than the diameter of the second chamber 63.

With continued reference to fig. 1, the sun gear 1, the planet carrier 3, the ring gear 4 and the annular oil deflector 5 are coaxial, with the axis of each planet gear 2 being parallel to the axis of the sun gear 1. The sun wheel 1 is used as a power input end and is rigidly connected with a power input shaft, namely the power input shaft is connected with the sun wheel 1. Sun gear 1 and a plurality of planetary gear 2 external toothing, a plurality of planetary gear 2 transmission connection are in planet carrier 3, and exemplarily, planet carrier 3 includes a plurality of installation axles, and the axis of every installation axle is parallel with the axis of sun gear 1, and a plurality of planetary gear 2 install respectively in a plurality of installation axles through the bearing, wherein, the quantity of installation axle is the same with planetary gear 2's quantity.

The number of planet gears 2 is exemplarily three.

With continued reference to fig. 1, the planet carrier 3 is rigidly connected to the power take-off shaft as a power take-off, i.e. the planet carrier 3 is connected to the power take-off shaft. For example, the planet carrier 3 may be formed integrally with the power take-off shaft.

With continued reference to fig. 1, the power output shaft is mounted in the second chamber 63, the plurality of planetary gears 2 are internally meshed with the ring gear 4, the ring gear 4 is fixedly mounted on the inner wall of the first chamber 62, illustratively, the periphery of the ring gear 4 is provided with a protrusion, the inner wall of the first chamber 62 is provided with a clamping groove, and the ring gear 4 is clamped into the clamping groove through the protrusion, so that the ring gear 4 is fixed on the inner wall of the first chamber 62.

With reference to fig. 1, the annular oil baffle 5 is sleeved on the planet carrier 3, the outer wall of the annular oil baffle 5 is in clearance fit with the inner wall of the first chamber 62, and the annular oil baffle 5 is fixedly connected to the inner side of the connecting wall 61.

Illustratively, referring to fig. 3 and 4, fig. 3 is a schematic structural view of an angle of the casing 6 according to an embodiment of the present invention, and fig. 4 is a schematic structural view of the annular oil deflector 5 according to an embodiment of the present invention. The inner side of the connecting wall 61 is provided with a plurality of raised first bolt holes 611 distributed at intervals circumferentially around the center, the annular oil baffle 5 is provided with a plurality of second bolt holes 51 distributed at intervals circumferentially around the center, and the first bolt holes 611 and the second bolt holes 51 are connected by bolts.

Thereby, the annular oil deflector 5 is fixedly attached to the inside of the connecting wall 61 by bolts.

With continued reference to fig. 2 and 4, the gap between the annular oil baffle 5 and the connecting wall 61 forms an oil storage cavity 7, an upper notch 52 is arranged above the outer wall of the annular oil baffle 5, a lower notch 53 is arranged right below the outer wall of the annular oil baffle 5, and the size of the upper notch 52 is larger than that of the lower notch 53.

For example, the number of the upper notches 52 may be four, and the number of the lower notches 53 may be one.

When the coaxial planetary gear reducer provided by the embodiment of the invention works, the power input shaft drives the sun gear 1 to rotate, and the plurality of planetary gears 2 are connected with the planet carrier 3 in a transmission way and are respectively meshed with the outer surface of the sun gear 1 and the inner surface of the gear ring 4, so that the sun gear 1 drives the plurality of planetary gears 2 to revolve and rotate.

A plurality of planetary gear 2 drive planet carrier 3 and rotate, because the inner wall below next-door neighbour planet carrier 3 department of first cavity 62 is provided with the oil storage groove of storage lubricating oil, consequently, planet carrier 3 rotates and stirs the lubricating oil in the oil storage groove, and lubricating oil gets into oil storage cavity 7 through the last breach 52 of the outer wall top of annular oil baffle 5.

Since the size of the upper notch 52 is larger than that of the lower notch 53, most of the lubricating oil is retained in the oil reserving cavity 7, and a small portion of the lubricating oil flows back to the oil reserving groove through the lower notch 53 directly below the outer wall of the annular oil baffle 5.

The rotation of the planet carrier 3 continuously stirs the lubricating oil which flows back to the oil storage groove, the lubricating oil which flows back to the oil storage groove enters the oil storage cavity 7 through the upper notch 52 above the outer wall of the annular oil baffle plate 5, and the process of flowing back to the oil storage groove through the lower notch 53 is continuously repeated.

In the embodiment of the present invention, the casing 6 includes a first chamber 62 and a second chamber 63 which are communicated with each other and connected to each other by a connecting wall 61, the diameter of the first chamber 62 is larger than that of the second chamber 63, and the sun gear 1, the plurality of planetary gears 2, the carrier 3, the ring gear 4, and the annular oil baffle 5 are all installed in the first chamber 62. Through setting up annular fender oil board 5, make annular fender oil board 5 and the gap between the wall 61 form oil storage cavity 7, through the mode that sets up breach 52 and lower breach 53 on annular fender oil board 5, make most lubricating oil remain in oil storage cavity 7, less part lubricating oil flows back to the oil storage groove through lower breach 53 under the outer wall of annular fender oil board 5, further make when coaxial-type planetary gear reducer is worked, the oil mass of the lubricating oil in the oil storage groove that planet carrier 3 stirs reduces, consequently, the oil stirring loss has been reduced, and simultaneously, make the resistance of the lubricating oil that each part of coaxial-type planetary gear reducer received when the motion reduce, work efficiency is improved, and also reduce the friction of each part of coaxial-type planetary gear reducer and lubricating oil, coaxial-type planetary gear reducer has heated.

At present, current planetary gear reducer's lubricating oil storage is in the casing below, and cooling system's cooling oil duct sets up in the casing bottom, and when planetary gear reducer during operation, planetary gear reducer's planet carrier rotates and stirs the lubricating oil of casing below for lubricating oil splashes, therefore remaining lubricating oil in casing below is less, and it is less to make the cooling oil duct pass through the lubricating oil that the casing can contact, and heat exchange efficiency is low, leads to the cooling effect relatively poor.

Referring to fig. 5 and 6, fig. 5 is a schematic structural view of another angle of the housing 6 according to the embodiment of the present invention, and fig. 6 is a schematic structural view of a cooling oil passage according to the embodiment of the present invention, in order to avoid the above situation of poor cooling effect, the cooling oil passage 8 is disposed on the outer side of the connecting wall 61, wherein the arrow on the right side in fig. 6 indicates that the lubricating oil in the first chamber 62 can enter the oil storage cavity 7 from above the annular oil baffle 5, and the arrow on the left side indicates that the lubricating oil in the oil storage cavity 7 can flow back to the first chamber 62 from below the annular oil baffle 5.

Because the gap between the annular oil baffle 5 and the connecting wall 61 forms the oil storage cavity 7, and the cooling oil duct 8 is arranged on the outer side of the connecting wall 61, the cooling oil duct 8 is close to the oil storage cavity 7, and the connecting wall 61 is arranged between the cooling oil duct 8 and the oil storage cavity 7 as can be seen from fig. 6. And when the coaxial planetary gear reducer works, most of lubricating oil is remained in the oil storage cavity 7, and the lubricating oil in the oil storage cavity 7 can not splash everywhere, so that more lubricating oil can be contacted with the cooling oil duct 8 in the oil storage cavity 7 through the connecting wall 61, the heat exchange efficiency is improved, and the cooling effect is further improved.

When the existing planetary gear reducer works, the planet carrier rotates and stirs lubricating oil below the shell, so that the lubricating oil splashes, the lubricating oil quickly flows to the position of the vent plug, the vent plug leaks oil, and the work of the planetary gear reducer is seriously influenced.

With continued reference to fig. 5, in order to avoid the oil leakage of the vent plug, the embodiment of the present invention further provides a vent plug 9, and a vent hole is provided above the inner wall of the first chamber 62 close to the oil storage cavity 7, and the vent hole is located away from the upper notch 52, and the vent plug 9 is installed on the vent hole.

When the coaxial planetary gear reducer works, the planet carrier 3 rotates and stirs lubricating oil in the oil storage groove, so that the flowing speed of the lubricating oil in the oil storage cavity 7 is low, and the position of the vent hole is far away from the upper notch 52, therefore, the lubricating oil is not easy to leak from the vent plug 9, and the oil leakage probability of the vent plug is reduced.

With continued reference to fig. 1 and 3, the coaxial planetary gear reducer according to the embodiment of the present invention may further include a tapered roller bearing 10, the power output shaft is mounted in the second chamber 63 through the tapered roller bearing 10, and the inside of the connecting wall 61 is provided with an oil supply passage 11 that leads to the tapered roller bearing 10.

Because the oil supply duct 11 leading to the tapered roller bearing 10 is arranged on the inner side of the connecting wall 61, when the coaxial planetary gear reducer works, the lubricating oil in the oil storage cavity 7 can convey the lubricating oil for the tapered roller bearing 10 along the oil supply duct 11, and the normal work of the tapered roller bearing 10 is ensured.

Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A coaxial planetary gear reducer with a shell for cooling is characterized by comprising a sun gear, a plurality of planetary gears, a planet carrier, a gear ring, an annular oil baffle and a shell;

2. The speed reducer according to claim 1, wherein the outside of the connecting wall is provided with a cooling oil passage.

3. The decelerator of claim 1, further comprising a vent plug, wherein the first chamber is provided with a vent hole above an inner wall of the oil reservoir cavity, and the vent hole is located away from the upper notch, the vent plug being mounted to the vent hole.

4. The speed reducer according to claim 1, further comprising a tapered roller bearing through which the power output shaft is mounted in the second chamber, and an oil supply passage leading to the tapered roller bearing is provided inside the connecting wall.

5. The reducer according to claim 1, wherein the outer periphery of the ring gear is provided with a protrusion, and the inner wall of the first chamber is provided with a catching groove, and the ring gear is caught in the catching groove by the protrusion.

6. The speed reducer of claim 1, wherein the inner side of the connecting wall is provided with a plurality of raised first bolt holes circumferentially spaced around a center, the annular oil deflector is provided with a plurality of second bolt holes circumferentially spaced around the center, and the first bolt holes and the second bolt holes are connected by bolts.

7. The speed reducer of claim 1, wherein the planet carrier includes a plurality of mounting shafts, each mounting shaft having an axis parallel to an axis of the sun gear, the plurality of planet gears being mounted to the plurality of mounting shafts by bearings, respectively, wherein the number of mounting shafts is the same as the number of planet gears.

8. The reducer of claim 1, wherein the number of said planet gears is three.

9. The reducer according to claim 1, wherein the number of said upper notches is four and the number of said lower notches is one.

10. The speed reducer of claim 1, wherein the carrier is integrally formed with the power take-off shaft.