CN202381551U - Heat sink for rolling bearing - Google Patents
Heat sink for rolling bearing Download PDFInfo
- Publication number
- CN202381551U CN202381551U CN2011205477837U CN201120547783U CN202381551U CN 202381551 U CN202381551 U CN 202381551U CN 2011205477837 U CN2011205477837 U CN 2011205477837U CN 201120547783 U CN201120547783 U CN 201120547783U CN 202381551 U CN202381551 U CN 202381551U
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- bearing
- oil
- rolling bearing
- radiating groove
- fluid
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Abstract
The utility model discloses a heat sink for a rolling bearing, which includes a bearing pedestal, wherein a bearing hole is arranged in the bearing pedestal and is defined in the front and back direction, cooperation sections extending in the front and back direction and used for corresponding close fit with the outer cylindrical surface of a bearing outer ring during the use are arranged on the inner wall surface of the bearing hole, at least two cooperation sections of the bearing hole are distributed in the front and back direction, heat dissipation grooves used for allowing cooling fluid to pass through are arranged between the two adjacent cooperation sections on the inner wall surface of the bearing hole, and a fluid flow-in channel and a fluid flow-out channel communicated with the heat dissipation grooves are further formed on the bearing pedestal. The heat sink further includes a supply system used for supplying the cooling fluid to the heat dissipation grooves. The heat dissipation method provided by the utility model is convenient to use, the cooling and heat dissipation operations are performed on the rolling bearing through continuously and circularly inputting the low-temperature cooling liquid and outputting the high-temperature cooling liquid in the cooling pipeline formed by the heat dissipation grooves and the bearing outer ring, and the work environment of the rolling bearing is improved.
Description
Technical field
The utility model belongs to bearing heat dissipation technology field, is specifically related to a kind of sink of high-speed overload rolling bearing.
Background technique
Rolling bearing can produce great amount of heat owing to rub in operation process, in conventional design, these heats can distribute to the external world through the circulation of lubricant oil (fat) and the transmission of heat of bearing support, thereby guarantees rolling bearing proper functioning under allowable temperature.The big and running speed higher (near the reference rotation velocity or the limit speed of bearing) or when being in wherein a kind of operating mode when load that rolling bearing bore; Bearing is because the sharply increase of fricative heat; Only depend on the circulation of lubricant oil (fat) and the conduction of heat of bearing support in time not to distribute the heat that bearing produces; Thereby the temperature that makes bearing continues to raise; Finally cause the inefficacy of oiling agent and the damage of bearing, and cause the entire equipment cisco unity malfunction or serious accident takes place.At present; The high-speed overload bearing big load and high rotating speed applying working condition down usually the employing axial-flow blower to the bearing support forced heat radiation of drying; But the radiating effect of this method has significant limitation; Also increased the complexity of design cost and structure, for the component of compact structure, the design of this air cooling effect can't realize simultaneously.
The model utility content
The purpose of the utility model is to provide a kind of rolling bearing sink, to solve the bad technical problem of rolling bearing radiating effect of the prior art.
For realizing above-mentioned purpose; The rolling bearing sink that the utility model provided adopts following technological scheme: a kind of rolling bearing sink; Comprise bearing support; Bearing support is provided with bearing hole, with bearing hole axially be defined as fore-and-aft direction, have on the internal face of bearing hole and be used for corresponding friction tight cooperation section of extending when using along fore-and-aft direction with the outer cylinder surface of bearing outer ring; The cooperation section of described bearing hole is distributed with two at least along fore-and-aft direction; Be used for the but radiating groove that flows through of fluid of cooling cooperating to be provided with between the section in adjacent two on the internal face of bearing hole, on bearing support, also offer the fluid input channel and the fluid output channel that are connected with radiating groove, said sink also comprises the supply system that is used for supplying to radiating groove cooling fluid.
Described radiating groove is along the loop configuration of the extending circumferentially of bearing hole, and the radiating groove of loop configuration is distributed with a plurality of along fore-and-aft direction.
Be provided with along the last axial connectivity slot that is communicated with said fluid input channel of fore-and-aft direction extension in the bearing hole top on the described bearing support; On bearing support, be provided with the following axial connectivity slot that is communicated with said fluid output channel that extends along fore-and-aft direction in the bearing hole bottom; Described axial connectivity slot is connected with the radiating groove of said each loop configuration, and described axial connectivity slot down is connected with the radiating groove of said each loop configuration.
Described radiating groove is the axially extended helical structure along bearing hole.
The cross section of described radiating groove is rectangular or semicircle.
Described sink also comprises and is positioned at the outside said fluid input channel of connection of bearing support and the outer loop oil circuit of fluid output channel; The fluid input channel is the cold oil input channel; The fluid output channel is the cold oil output channel; Also be serially connected with fuel tank and oil pump on this outer loop oil circuit, externally between said cold oil output channel and fuel tank, be serially connected with the heat exchanger of the high temperature oil cooling that is used for the cold oil output channel is exported on the circulating oil path.
On the described bearing support in the said front side that cooperates section and/or rear side be provided with and be used for the lubricated lubricating structure of bearing roller; This lubricating structure comprises lubricant oil input channel and the lubricant oil output channel that is connected with bearing hole, and said lubricant oil input channel and lubricant oil output channel are communicated with said outer loop oil circuit.
Described outer loop oil circuit is communicated with said cold oil input channel and lubricant oil input channel through being arranged on the outside oil separator of said bearing support.
Described cold oil flowline comprises and is opened in bearing support bottom and said axial connectivity slot down vertical pipeline that is connected and the lateral duct that is communicated with vertical pipeline and said outer loop oil circuit.
Be provided with the injection oil pipe in the described lubricant oil input channel, an end that sprays oil pipe is equipped with and is used in use to the oily oil nozzle of the roller jet lubrication of bearing.
The beneficial effect of the utility model is: when in the bearing hole of bearing support that main shaft and rolling bearing are packed into; Main shaft rotates; Bearing inner race and roller rotate, and frictional heat between the inside and outside circle of roller and bearing is particularly running under the operating mode of high-speed overload; The heating value of bearing is more severe; In order to guarantee the operating temperature of rolling bearing, when utilizing cooling fluid in cooling line, to flow, the rolling bearing heat dissipating method that the utility model provides takes away rolling bearing because of fricative a large amount of heats with the heat exchange of bearing outer ring, thus the normal operation of assurance rolling bearing under the high-speed overload operating mode.The heat dissipating method that the utility model provided is easy to use, realizes the cooling heat dissipation to rolling bearing through the input low temperature and the cooling fluid of output high temperature that in cooling pipe, do not stop, improves the working environment of rolling bearing.The heat dissipating method that the utility model provided is easy to use, is specially adapted to rolling bearing and is in cooling under the high-speed overload operating mode, can effectively improve the working environment of rolling bearing.
In the rolling bearing sink that the utility model provided; Be used for the but radiating groove that flows through of fluid of cooling between two adjacent cooperation sections, being provided with on the internal face of the bearing hole of bearing support; And also offer the fluid input channel and the fluid output channel that are connected with radiating groove on the bearing support; Like this when using; Form cooling pipe by radiating groove on the bearing support and bearing outer ring outer cylinder surface, in cooling pipe, import cooling fluid through the fluid input channel, cooling fluid flows from the fluid output channel through cooling pipe; During through chilled fluid flow supercooling pipeline and the heat exchange of bearing outer ring take away rolling bearing because of fricative a large amount of heats, realize cooling to rolling bearing.The sink good cooling results that the utility model provided, easy to use, be specially adapted to rolling bearing and be in cooling under the high-speed overload operating mode, can effectively improve the working environment of rolling bearing.
Description of drawings
Fig. 1 is a kind of embodiment's of rolling bearing sink of providing of the utility model a structural representation;
Fig. 2 is an A-A place sectional view among Fig. 1;
Fig. 3 is the structural representation of Fig. 1 bottom bracket;
Fig. 4 is a B-B place sectional view among Fig. 3;
(arrow among Fig. 1, Fig. 2 is depicted as the flow direction of cold oil).
Embodiment
The rolling bearing heat dissipating method that the utility model provided; In the bearing hole that be installed in bearing support of main shaft 14 together with rolling bearing 12 correspondences; Cooperation section 300 corresponding drive fits on the internal face of the outer cylinder surface of housing washer and the bearing hole of bearing support; The radiating groove on the internal face of said bearing hole and the outer cylinder surface of housing washer surround cooling pipe 100, when main shaft 14 drives bearing inner race and roller rotation, the cooling fluid high pressure are injected cooling pipe; Cooling fluid gets into cooling pipe 100 and exports from the fluid output channel; When cooling fluid flows, carry out heat exchange in cooling pipe 100, realize heat radiation cooling bearing through cooling fluid and the bearing outer ring that flows through cooling pipe 100.
In the present embodiment, cooling fluid adopts cold oil, at this moment; In the bearing support outer installment outer loop oil circuit 4 that is communicated with said fluid input channel and fluid output channel is arranged, the fluid input channel is a cold oil input channel 8, and the fluid output channel is the cold oil output channel; Also be serially connected with fuel tank 1 and oil pump 5 on this outer loop oil circuit 4; Externally between said cold oil output channel and fuel tank, be serially connected with the heat exchanger 2 of the high temperature oil cooling that is used for the cold oil output channel is exported on the circulating oil path 4, during use, cold oil becomes high temperature oil after flowing through said cooling pipe; High temperature oil gets in the outer loop oil circuit through the cold oil output channel; After the heat exchanger cooling, become low temperature oil then and get into fuel tank, after the outer loop oil circuit is pumped to the cold oil input channel, low temperature oil gets in the said cooling pipe and carries out heat exchange with bearing the low temperature oil in the fuel tank by the oil pump pressurization; Low temperature oil becomes high temperature oil and flows back to fuel tank more again then, and what move in circles carries out cooling heat dissipation to bearing.
In the foregoing description; Thereby the heat exchange of carrying out of cooling fluid through flowing through cooling pipe and bearing outer ring realizes the heat radiation cooling to rolling bearing; This heat dissipating method is efficient, quick; Be specially adapted to rolling bearing and be in cooling under the high-speed overload operating mode, can effectively improve the working environment of rolling bearing, prolong the working life of bearing.
Certainly, also can adopt different cooling fluids according to the real work situation of rolling bearing, at this moment, just no longer need the outer loop oil circuit, the corresponding supply system that only need be provided for supplying cooling fluid gets final product.
Above-mentioned heat dissipating method can adopt like Fig. 1 and realize that the concrete structure of sink is described below to rolling bearing sink shown in Figure 4.
Like Fig. 1, Fig. 2, Fig. 3, shown in Figure 4; A kind of embodiment of rolling bearing sink; Sink among this embodiment comprises bearing support 200, and bearing support is provided with bearing hole, and bearing hole axially is defined as fore-and-aft direction; Have on the internal face of bearing hole and be used for corresponding friction tight cooperation section 300 of extending when using along fore-and-aft direction with the outer cylinder surface of bearing outer ring; The cooperation section of the bearing hole in the present embodiment is distributed with two along front and back, two of bearing hole cooperate section to correspond respectively to the front end and back end of bearing outer ring during use, is used to the radiating groove 10 that supplies cold oil to flow through cooperating to be provided with between the section in adjacent two on the internal face of bearing hole; This radiating groove 10 is along the loop configuration of the extending circumferentially of bearing hole; The radiating groove of loop configuration is distributed with a plurality of along fore-and-aft direction, the cross section of the radiating groove here is rectangular, during use; The radiating groove of these loop configuration matches with the outer ring of bearing and surrounds cooling pipe 100, thus when cold oil flows through from cooling pipe and bearing outer ring carry out heat exchange take away rolling bearing because of rolling friction produce a large amount of heats.Be positioned on the bearing support 200 the bearing hole top be provided with extend along fore-and-aft direction on axial connectivity slot 9; Go up the radiating groove 10 that axial connectivity slot 9 is communicated with each loop configuration; Be provided with the following axial connectivity slot 17 that extends along fore-and-aft direction in the bottom of the bearing hole of bearing support 200; Down axial connectivity slot 17 is communicated with the radiating groove 10 of each loop configuration; On bearing support 200, also be provided with cold oil input channel 8 and cold oil output channel; Shown in figure, cold oil input channel 8 is the vertical pipeline structure that is communicated with last axial connectivity slot, and the cold oil output channel comprises and is located at the vertical pipeline 16 that is connected with described axial connectivity slot down of bearing support bottom and the lateral duct 18 of connection vertical pipeline and extraneous oil circuit.
In the present embodiment; On bearing support 200, be provided with rear side and be used for lubricating structure that bearing roller is lubricated in the said front side that cooperates section; This lubricating structure comprises the lubricant oil input channel 30 and lubricant oil output channel 15 that is connected with bearing hole; In lubricant oil input channel 30, be provided with and spray oil pipe 11; An end that sprays oil pipe 11 is equipped with the oil nozzle 13 that is used in use to the roller jet lubrication oil of bearing, and described lubricant oil output channel 15 is communicated with the lateral duct 18 of said cold oil output channel.
Described sink also comprises and is positioned at the outside said cold oil input channel of connection of bearing support and the outer loop oil circuit 4 of cold oil output channel; The output terminal 6 of outer loop oil circuit 4 is communicated with cold oil input channel 8 and lubricant oil input channel 30 through being arranged on the outer oil separator 7 of bearing support, and 19 of the input ends of outer loop oil circuit 4 are connected with the horizontal pipeline 18 of cold oil output channel.Externally be serially connected with fuel tank 1 and oil pump 5 on the circulating oil path 4, externally between input end 19 and fuel tank 1, also be serially connected with the heat exchanger 2 of the high temperature oil cooling that is used for exporting from the cold oil output channel on the circulating oil path 4.
During use; When in the bearing hole of bearing support 200 that main shaft 14 is packed into together with rolling bearing 12; Form cooling pipe 100 by radiating groove on the bearing support 200 and bearing outer ring; Oil pump 5 is delivered to oil separator 7 positions to cooling/lubricant oil 3 sucking-off from fuel tank 1 through outer loop oil circuit 4, and cooling/lubricant oil is divided into two-way behind oil separator:
(1) cooling oil circuit
Cold oil is after 8 entering of cold oil input channel are gone up in the axial connectivity slot 9; Divided and flow in several radiating grooves 10; These radiating grooves and bearing outer ring constitute the cooling pipe 100 of sealing; Realize heat exchange with bearing outer ring when cold oil flows in cooling pipe, thereby take away a large amount of heats of bearing, play the effect that reduces bearing temperature.Cold oil enters into down in the axial connectivity slot 17 after cooling pipe reaches the bearing bottom, gets into outer loop oil circuit 4 through the cold oil output channel again.
(2) lubricating oil path
Lubricant oil is ejected on the roller through the injection oil pipe 11 in the lubricant oil input channel 30; Roller and raceway to bearing plays lubricated and cooling effect on the one hand; Lubricant oil contacts with the direct of raceway to avoid bearing roller at surface of friction pair formation oil film on the other hand; Reduce friction factor, flow of lubricant after in the lateral duct 18 that lubricant oil output channel 15 imports in the cold oil output channels, and finally gets into outer loop oil circuit 4 to the bottom of bearing support.
Cold oil and lubricant oil are after the lateral duct 18 of cold oil output channel gets into outer loop oil circuit 4; After heat exchanger 2 coolings, become low temperature oil and get into fuel tank 1; Low temperature oil in the fuel tank 1 is pumped to cold oil input channel 8 and lubricant oil input channel 30 by oil pump 5 through the outer loop oil circuit; Low temperature oil gets in the said cooling pipe 100 rolling bearing 12 is carried out cooling heat dissipation, and simultaneously, low temperature oil is injected on the roller of rolling bearing 12 through spraying oil pipe 11; Low temperature oil becomes high temperature oil and flows back to fuel tank 1 more again then, and what move in circles carries out cooling heat dissipation and lubricated to bearing.
The sink that is provided in the foregoing description adopts heat change method; Utilize circuit cold oil and lubricant oil in the cooling pipe that the radiating groove of bearing support and bearing outer ring constitute, to flow and take away rolling bearing, and dispel the heat to the external world through heat exchanger because of fricative heat.Cold oil temperature on the flow velocity of the length of sectional shape through offering the different radiating groove and size, radiating groove, adjustment cold oil and the turnover bearing support on the cooling pipe is kept the normal working temperature of bearing under different operating modes, thereby guarantees the normal operation of bearing under the high-speed overload operating mode.
In the foregoing description; Radiating groove is along the loop configuration of the extending circumferentially of bearing hole, and the radiating groove of loop configuration is distributed with a plurality of in bearing hole along fore-and-aft direction, and each radiating groove is connected through last axial connectivity slot and following axial connectivity slot; Make each radiating groove be in parallelly connected state; Cold oil can flow through each radiating groove, and the cooling oil mass that flows into like this in the radiating groove is more, has increased the heat exchange amount of cold oil and bearing outer ring.In other embodiments; Radiating groove also can adopt other structures; Be axially extended helical structure like employing along bearing hole; An axial end of this spirality radiating groove is communicated with the cold oil input channel, its axial the other end is connected with the cold oil output channel, at this moment, axial connectivity slot and following axial connectivity slot is not set.When radiating groove adopted helical structure, the cold oil flow that gets into bearing support can reduce, but because prolonged the flow path of cold oil, had increased the heat exchanger time of cold oil and bearing outer ring, can reach the effect that reduces the bearing working temperature equally.
In the above-described embodiments, reaching down through last axial connectivity slot, axial connectivity slot in other embodiments, also can not be connected the radiating groove connection of each loop configuration, and each radiating groove directly is communicated with cold oil input channel and cold oil output channel.
In the above-described embodiments, preferably cold oil input channel and cold oil output channel are connected, and externally are serially connected with heat exchanger on the circulating oil path through the outer loop oil circuit, can move in circles like this to the bearing support cooling of dispelling the heat.Also can not adopt the outer loop oil circuit in other embodiments, at this moment, the cooling fluid that flows through the cooling pipe of being made up of radiating groove in the said bearing hole and bearing outer ring can adopt other cooling mediums such as cooling air or cooling water.When if rolling bearing is in the high-speed overload operating mode, cooling fluid still adopts the cooling heat dissipation effect of cooling water can be better.
The cross section of the radiating groove in the foregoing description is rectangular, and in other embodiments, other structure also can be adopted in the cross section of radiating groove, like semicircle or triangular structure.
On the internal face of the bearing hole of the bearing support in the foregoing description two cooperates section to cooperate with the rear and front end portion of bearing outer ring respectively; In other embodiments; Cooperation section on the internal face of the bearing hole of bearing support can all be provided with radiating groove for more than two sections between every two adjacent cooperation sections.
In the above-described embodiments, because the consumption of the consumption of cold oil and lubricant oil differs bigger, so adopt oil separator.In other embodiments; Also can not select oil separator for use; And have the input end of outer loop oil circuit to be communicated with cold oil input channel and lubricant oil input channel through different flow control valves; Thereby realize control, guarantee rolling bearing cooling heat dissipation and lubrication effect to cold oil and flow rate of lubricating oil flow velocity.
In the above-described embodiments, preferred, be respectively arranged with lubricant oil input channel and lubricant oil output channel in the front and back side of the cooperation section of bearing hole.In other embodiments, also can only lubricant oil input channel and lubricant oil output channel be set at the front side or the rear side that cooperate section.
Claims (10)
1. rolling bearing sink; Comprise bearing support; Bearing support is provided with bearing hole; Bearing hole axially is defined as fore-and-aft direction; Have on the internal face of bearing hole and be used for corresponding friction tight cooperation section of extending along fore-and-aft direction with the outer cylinder surface of bearing outer ring when using, it is characterized in that: the cooperation section of described bearing hole is distributed with two at least along fore-and-aft direction, is used for the but radiating groove that flows through of fluid of cooling cooperating to be provided with between the section in adjacent two on the internal face of bearing hole; On bearing support, also offer the fluid input channel and the fluid output channel that are connected with radiating groove, said sink also comprises the supply system that is used for to radiating groove supply cooling fluid.
2. rolling bearing sink according to claim 1 is characterized in that: described radiating groove is along the loop configuration of the extending circumferentially of bearing hole, and the radiating groove of loop configuration is distributed with a plurality of along fore-and-aft direction.
3. rolling bearing sink according to claim 2; It is characterized in that: be provided with along the last axial connectivity slot that is communicated with said fluid input channel of fore-and-aft direction extension in the bearing hole top on the described bearing support; On bearing support, be provided with the following axial connectivity slot that is communicated with said fluid output channel that extends along fore-and-aft direction in the bearing hole bottom; Described axial connectivity slot is connected with the radiating groove of said each loop configuration, and described axial connectivity slot down is connected with the radiating groove of said each loop configuration.
4. rolling bearing sink according to claim 1 is characterized in that: described radiating groove is the axially extended helical structure along bearing hole.
5. rolling bearing sink according to claim 1 is characterized in that: the cross section of described radiating groove is rectangular or semicircle.
6. according to any described rolling bearing sink in the claim 1 to 5; It is characterized in that: described sink also comprises and is positioned at the outside said fluid input channel of connection of bearing support and the outer loop oil circuit of fluid output channel; The fluid input channel is the cold oil input channel; The fluid output channel is the cold oil output channel; Also be serially connected with fuel tank and oil pump on this outer loop oil circuit, externally between said cold oil output channel and fuel tank, be serially connected with the heat exchanger of the high temperature oil cooling that is used for the cold oil output channel is exported on the circulating oil path.
7. rolling bearing sink according to claim 6; It is characterized in that: on the described bearing support in the said front side that cooperates section and/or rear side be provided with and be used for the lubricated lubricating structure of bearing roller; This lubricating structure comprises lubricant oil input channel and the lubricant oil output channel that is connected with bearing hole, and said lubricant oil input channel and lubricant oil output channel are communicated with said outer loop oil circuit.
8. rolling bearing sink according to claim 7 is characterized in that: described outer loop oil circuit is communicated with said cold oil input channel and lubricant oil input channel through being arranged on the outside oil separator of said bearing support.
9. rolling bearing sink according to claim 7 is characterized in that: described cold oil flowline comprises and is opened in bearing support bottom and said axial connectivity slot down vertical pipeline that is connected and the lateral duct that is communicated with vertical pipeline and said outer loop oil circuit.
10. rolling bearing sink according to claim 7 is characterized in that: be provided with the injection oil pipe in the described lubricant oil input channel, an end that sprays oil pipe is equipped with and is used in use to the oily oil nozzle of the roller jet lubrication of bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205477837U CN202381551U (en) | 2011-12-24 | 2011-12-24 | Heat sink for rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205477837U CN202381551U (en) | 2011-12-24 | 2011-12-24 | Heat sink for rolling bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202381551U true CN202381551U (en) | 2012-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205477837U Expired - Fee Related CN202381551U (en) | 2011-12-24 | 2011-12-24 | Heat sink for rolling bearing |
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| Country | Link |
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| CN (1) | CN202381551U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103672347A (en) * | 2013-12-31 | 2014-03-26 | 湖南崇德工业科技有限公司 | Lubrication structure of sliding bearing |
| CN105299065A (en) * | 2015-11-13 | 2016-02-03 | 国网新疆电力公司阿勒泰供电公司 | External self-backflow oil cooling device for horizontal hydraulic generators |
| CN106763212A (en) * | 2016-11-22 | 2017-05-31 | 响水县冠龙轴承座制造有限公司 | A kind of bearing block of lubrication oil circulation formula |
-
2011
- 2011-12-24 CN CN2011205477837U patent/CN202381551U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103672347A (en) * | 2013-12-31 | 2014-03-26 | 湖南崇德工业科技有限公司 | Lubrication structure of sliding bearing |
| CN105299065A (en) * | 2015-11-13 | 2016-02-03 | 国网新疆电力公司阿勒泰供电公司 | External self-backflow oil cooling device for horizontal hydraulic generators |
| CN105299065B (en) * | 2015-11-13 | 2017-11-14 | 国网新疆电力公司阿勒泰供电公司 | Horizontal hydrogenerator is external from backflow oil cooler |
| CN106763212A (en) * | 2016-11-22 | 2017-05-31 | 响水县冠龙轴承座制造有限公司 | A kind of bearing block of lubrication oil circulation formula |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20151224 |
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| EXPY | Termination of patent right or utility model |