CN209781053U - Valve rocker chamber and cylinder head cover with composite lubricating oil path - Google Patents
Valve rocker chamber and cylinder head cover with composite lubricating oil path Download PDFInfo
- Publication number
- CN209781053U CN209781053U CN201920017771.XU CN201920017771U CN209781053U CN 209781053 U CN209781053 U CN 209781053U CN 201920017771 U CN201920017771 U CN 201920017771U CN 209781053 U CN209781053 U CN 209781053U
- Authority
- CN
- China
- Prior art keywords
- lubricating oil
- cylinder head
- cover
- cylinder
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lubrication Of Internal Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The utility model discloses a valve rocker arm room with compound lubrication oil circuit belongs to the small-size engine field, and it includes that cylinder head and cylinder head housing cover close the valve rocker arm room that forms, and a cylinder head oil mist passageway and a cylinder head lubricating oil duct that communicate with valve rocker arm room are seted up to the cylinder head. At least one forced lubricating oil outlet is formed in the top of the cylinder head cover, and lubricating oil channels are formed in the top and the side wall of the cylinder head cover and communicated with a cylinder head lubricating oil channel on the cylinder head respectively. The utility model discloses combine two kinds of lubricated modes of oil mist lubrication and forced lubrication, make the indoor each motion pair lubrication of valve rocker sufficient to cool down valve rocker room, thereby improve reliability, stability and the durability of each motion pair and heat engine part.
Description
Technical Field
The invention belongs to the field of engine lubricating systems, and particularly relates to a valve rocker chamber with a composite lubricating oil way and a cylinder head cover with a forced lubricating oil way.
Background
The existing cylinder cover of the small-sized general gasoline engine usually only adopts an oil mist lubrication mode to lubricate a rocker arm chamber kinematic pair, the oil mist lubrication mode has a simple structure and is convenient to process, but the generation of oil mist and the concentration of the oil mist are affected by factors such as the rotating speed of the gasoline engine, the pressure in a crankcase, the stirring of the engine oil by friction pairs such as a crankshaft connecting rod, a camshaft and the like, poor lubrication often occurs in the kinematic pair, and the conditions such as the jamming of the rocker arm chamber friction pair, the breakage of a valve oil seal lip buckle, the abnormal abrasion of a valve rod.
In addition, it is difficult to cool and dissipate heat from the engine body (mainly the cylinder head) only by using oil mist lubrication, so the thermal load of the heat engine part is very high, and the performance of the engine is seriously affected.
Based on this, the present application is proposed.
Disclosure of Invention
In order to solve the problem of insufficient lubrication of friction pairs of medium and small-sized universal gasoline engine rocker arms in the prior art, the invention provides the valve rocker arm chamber adopting a composite lubrication mode, so that the kinematic pair of the rocker arm can be ensured to be sufficiently lubricated, the abrasion is reduced, the conditions that the friction pair is clamped in the rocker arm chamber and the like are avoided, and the normal work of an engine is ensured.
In order to achieve the purpose, the invention adopts the following scheme: the valve rocker chamber with the composite lubricating oil path comprises a cylinder cover and a cylinder cover cap which are covered to form the valve rocker chamber, and the cylinder cover is provided with a cylinder cover oil mist channel and a cylinder cover lubricating oil channel which are communicated with the valve rocker chamber. The top and the side wall of the cylinder head cover are respectively provided with a lubricating oil channel which is communicated with a cylinder head lubricating oil channel on the cylinder head; at least one forced lubricating oil outlet is formed in the top of the cylinder head cover opposite to the air inlet rocker arm assembly and the air exhaust rocker arm assembly, and the forced lubricating oil outlet is communicated with the lubricating oil channel.
Wherein, the bottom outlet of the lubricating oil channel on the side wall of the cylinder head cover is opposite to and communicated with the top outlet of the lubricating oil channel of the cylinder head.
The invention further provides the following: in order to balance the structure of the cylinder cover, the cylinder cover oil mist channel and the cylinder cover lubricating oil channel are respectively arranged on two sides of the cylinder cover, and the oil circuit of the cylinder cover oil mist channel and the oil circuit of the cylinder cover lubricating oil channel can be prevented from being staggered, so that the cylinder cover structure is convenient to process.
The invention further provides the following: in order to fully lubricate all components in the cylinder rocker arm chamber, two sides of the top bottom surface of the cylinder head cover are respectively provided with at least one forced lubricating oil outlet.
The invention further provides the following: in order to fully lubricate the air inlet rocker arm assembly and the exhaust rocker arm assembly, the forced lubrication outlet is arranged right opposite to the rocker arm.
The invention further provides the following: in order to improve the oil inlet amount and the oil inlet speed of lubricating oil, the oil mist channel of the cylinder cover and the lubricating oil channel of the cylinder cover are through holes which are vertically arranged and vertically run through the cylinder cover.
The invention is further provided with only one cylinder cover oil mist channel and one cylinder cover lubricating oil channel.
The invention also provides a cylinder head cover which is provided with a forced lubricating oil path, wherein two sides of the top of the cylinder head cover are provided with component lubricating oil channels respectively corresponding to the positions of the air inlet rocker arm component and the exhaust rocker arm component, the component lubricating oil channels are provided with forced oil outlets, and the component lubricating oil channels on the two sides are communicated through a middle lubricating oil channel. And a lubricating oil passage communicated with any component lubricating oil passage or the middle lubricating oil passage is arranged on the side wall of the cylinder head cover.
The cylinder head cover of the invention is further provided with the following components: in order to ensure that the transportation efficiency of the lubricating oil is highest and the oil output is large, one lubricating oil channel and two lubricating oil channels are respectively arranged in the middle, and the number of the lubricating oil channels of the assembly is two.
The cylinder head cover of the invention is further provided with the following components: in order to further improve the conveying speed of the lubricating oil, the component lubricating oil channel is vertically communicated with the middle lubricating oil channel.
The cylinder head cover of the invention is further provided with the following components: in order to ensure that the oil supply is sufficient at each part of the integral forced lubrication and ensure the splashing range of the lubricating oil sprayed from the oil outlet, the lubricating oil channel of the assembly is arranged in parallel with the side edges at two sides of the cylinder head cover, and the length of the lubricating oil channel is preferably not more than one half of the length of the side edge adjacent to the lubricating oil channel in the side edges at two sides of the cylinder head cover.
The invention has the following technical effects: the cylinder cover is provided with the cylinder cover oil mist channel communicated with the valve rocker chamber to provide oil mist lubrication for each kinematic pair, and the cylinder cover are respectively provided with the cylinder cover lubricating oil channel and the lubricating oil channel to forcibly provide liquid lubricant for each kinematic pair for forced lubrication, so that the lubrication of each kinematic pair is ensured to be sufficient, the conditions of part abrasion and kinematic pair jamming caused by friction are further reduced, and the normal operation of the engine valve rocker structure is ensured.
Because the liquid lubricating oil is adopted, the liquid lubricating oil is cooled (the engine cooling system extracts the lubricating oil at the bottom from the crankcase body and cools the lubricating oil for lubrication, which is the prior art), and when the liquid lubricating oil is used for lubricating the valve rocker arm, the liquid lubricating oil can cool the valve rocker arm to a certain degree, so that the heat load of a heat engine part is reduced, and the problem that the engine cannot work due to the damage of the heat engine is avoided.
The cylinder head cover is provided with the forced lubricating oil channel, and can forcibly provide liquid lubricant for each kinematic pair for forced lubrication, so that sufficient lubrication of each kinematic pair is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of an oil path structure of a cylinder head cover according to an embodiment of the present invention.
Shown in the figure: 1-cylinder head, 2-cylinder head cover sealing gasket, 3-bolt, 4-air inlet rocker arm assembly, 5-valve rocker arm chamber, 6-air inlet rocker arm assembly lubricating oil channel, 7-cylinder head cover lubricating oil channel b, 8-cylinder head cover lubricating oil channel a, 9-exhaust rocker arm assembly lubricating oil channel, 10-cylinder head cover, 11-exhaust rocker arm assembly, 12-cylinder head lubricating oil channel, 13-cylinder head oil mist channel.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a valve rocker chamber 5 with a composite lubrication oil path, the valve rocker chamber 5 is formed by covering a cylinder head 1 and a cylinder head cover 10, and includes an intake rocker arm assembly 4 and an exhaust lubrication assembly therein. The size of the cylinder head 1 is adapted to the size of the head cover 10. Based on the direction shown in fig. 1, a cylinder head oil mist channel 13 and a cylinder head lubricating oil channel 12 are respectively formed on the left side and the right side of the cylinder head 1, and the cylinder head oil mist channel 13 and the cylinder head lubricating oil channel 12 are vertically arranged and vertically run through, so that the valve rocker arm chamber 5 is communicated with oil passages on a cylinder block and a crankcase. The lower opening of the cylinder head oil mist channel 13 is communicated with the oil mist channel on the crankcase, and the upper opening is directly communicated with the valve rocker arm chamber 5.
in this embodiment, the size of the cylinder head oil mist channel 13 is about 3 ~ 6 times of the size of the cylinder head lubricating oil channel 12, so that a large amount of lubricating oil mist can pass through the cylinder head oil mist, and the components in the valve rocker chamber 5 are lubricated after the valve rocker chamber 5 is filled with the lubricating oil mist.
The oil mist lubrication specifically acts as follows: the lubricating oil in the lubricating oil chamber at the bottom of the crankcase can generate lubricating oil mist in the rotating process of a kinematic pair formed by the crankshaft, the connecting rod, the timing gear and the balance shaft, and the lubricating oil mist can enter the oil mist channel 13 of the cylinder cover through the oil mist channel on the crankcase under the action of the crankcase pressure generated by the reciprocating motion of the piston and then directly enters the valve rocker arm chamber 5 to lubricate and cool the air inlet assembly and the air exhaust assembly.
The cylinder head oil passage 12 also has an upper opening and a lower opening, but the cylinder head oil passage 12 is provided near the edge of the cylinder head 1 at a position close to the side wall of the cylinder head cover 10. And a cylinder head cover lubricating oil passage a8 communicated with the cylinder head cover lubricating oil passage 12 is arranged on the side wall of the cylinder head cover 10 opposite to the cylinder head lubricating oil passage 12 or attached to the side wall of the cylinder head cover 10.
referring to fig. 2, the head cover 10 of the present embodiment has a structure in which the top of the head cover is respectively opposite to the intake rocker arm assembly 4 and the exhaust rocker arm assembly 11 in the valve rocker chamber 5 below the head cover, the intake rocker arm assembly lubricating oil passage 6 and the exhaust rocker arm assembly lubricating oil passage 9 are respectively provided with an intake rocker arm assembly lubricating oil passage 6 and an exhaust rocker arm assembly lubricating oil passage 9, the intake rocker arm assembly lubricating oil passage 6 is provided with 2 forced lubrication oil outlets, the position of which is indicated by the positive reference numeral 6 in the figure, the exhaust rocker arm assembly lubricating oil passage 9 is provided with 1 forced lubrication oil outlet, the position of which is indicated by the positive reference numeral 9 in the figure, the forced lubrication outlets are opposite to the rocker arms, the positive reference numerals are positions which enable the intake rocker arm assembly 4 and the exhaust rocker arm assembly 11 to be located within the range of oil injection from the forced lubrication outlets, the number.
Since the cylinder head oil gallery 12 is located on the side of the intake rocker arm assembly 4, the cylinder head oil gallery 12 communicates directly with the intake rocker arm assembly oil gallery 6. Therefore, the upper opening of the exhaust rocker arm assembly lubricating oil passage 9 and the cylinder head lubricating oil passage 12 is communicated with the cylinder head cover lubricating oil passage a8 arranged on the side wall of the cylinder head cover 10 through the cylinder head cover lubricating oil passage b7 arranged at the top of the cylinder head cover 10. The lower opening of the cylinder head lubricating oil passage 12 is communicated with a cooling and lubricating system of the engine.
In this embodiment, intake rocker arm assembly lubricating oil duct 6 and exhaust rocker arm assembly lubricating oil duct 9 parallel arrangement, and the two is all perpendicular with cylinder head cover lubricating oil duct b7, and exhaust rocker arm assembly lubricating oil duct 9, cylinder head cover lubricating oil duct b7, cylinder head cover lubricating oil duct a8, cylinder head lubricating oil duct 12 all are located the coplanar, and the butt joint and the processing of the oil circuit of both having been convenient for also through the mode that shortens the oil circuit route, have improved the transport speed of lubricating oil.
In this embodiment, the intake rocker arm assembly lubricating oil passage 6 and the exhaust rocker arm assembly lubricating oil passage 9 are short oil passages, and the lengths of the short oil passages are preferably not more than half of the lengths of the adjacent side edges of the two side edges of the cylinder head cover 10. The cylinder head cover lubricating oil passage b7 is a long oil passage which spans the exhaust side and the intake side, and the exhaust rocker arm assembly lubricating oil passage 9 is shorter than the intake rocker arm assembly lubricating oil passage 6. The head cover lubricating oil passage b7 is arranged in parallel with the bottom edge of the head cover 10.
Two forced lubrication outlets on the side of the intake rocker arm assembly 4 are respectively positioned on the end parts of the upper end and the lower end of the short oil passage of the lubricating oil passage 6 of the intake rocker arm assembly. Correspondingly, two forced lubrication outlets on the side of the exhaust rocker arm assembly 11 are also respectively positioned at the ends of the upper and lower sections of the short oil passage of the lubricating oil passage 9 of the exhaust rocker arm assembly. In this embodiment, the cylinder head cover lubricating oil passage b7 is not provided with a forced lubrication outlet, and a forced lubrication outlet can be additionally arranged on the cylinder head cover lubricating oil passage b7 according to actual use requirements.
The forced lubrication has the following specific action process: lubricating oil in the lubricating oil chamber at the bottom of the crankcase is absorbed by the oil pump, and firstly flows through the main oil duct on the box body to be shunted, enters the cylinder cover lubricating oil duct 12 on the cylinder cover 1, then enters the cylinder cover lubricating oil duct a8 on the cylinder cover 10, enters the exhaust rocker arm assembly lubricating oil duct 9 to lubricate and cool the exhaust rocker arm assembly 11, and simultaneously enters the intake rocker arm assembly lubricating oil duct 6 through the cylinder cover lubricating oil duct b7 to lubricate and cool the intake rocker arm assembly 4.
Example 2
The present embodiment is different from embodiment 1 in that: in the embodiment, only one cylinder head lubricating oil passage 12 is arranged, but two cylinder head 1 oil mist lubricating oil passages are arranged, are positioned on one side of the intake rocker arm assembly 4 and are arranged in front of and behind the intake rocker arm assembly.
The oil mist lubrication process and the forced lubrication process of this embodiment are substantially the same as those of embodiment 1, and are not described again.
Example 3
The present embodiment differs from embodiment 1 in that: in this embodiment, two cylinder head cover 10 oil passages are provided, but only one cylinder head 1 oil mist oil passage is provided, one cylinder head oil passage 12 is provided on the side of the exhaust rocker arm assembly 11, and the other cylinder head cover 10 oil passage is provided on the side of the intake rocker arm together with the cylinder head 1 oil mist oil passage. Further, a cylinder head cover 10 oil passage is provided in the cylinder rocker arm chamber, and another cylinder head oil passage 12 is provided in the cylinder head 1 at a position on or near the side wall of the cylinder head cover 10. In order to correspond to the other cylinder cover lubricating oil passage 12, one cylinder cover lubricating oil passage a8 can be additionally arranged above the position of the other cylinder cover lubricating oil passage 12 and is communicated with the other cylinder cover lubricating oil passage 12. In embodiment 1, the cylinder head cover lubricating oil passage b7 can be eliminated, the intake rocker arm assembly lubricating oil passage 6 is communicated with another cylinder head lubricating oil passage 12 through an additional cylinder head cover lubricating oil passage a8, and the exhaust rocker arm assembly lubricating oil passage 9 is communicated with the cylinder head lubricating oil passage 12 through the cylinder head cover lubricating oil passage a 8.
The oil mist lubrication process of this example is the same as example 1, and the forced lubrication process is as follows: lubricating oil in a lubricating oil chamber at the bottom of the crankcase is absorbed by an oil pump, is firstly shunted by a main oil duct on the box body, then enters two cylinder cover lubricating oil ducts 12 on the cylinder cover 1, respectively enters a cylinder cover lubricating oil duct a8 on the cylinder cover 10 through the two cylinder cover lubricating oil ducts 12, then respectively enters an exhaust rocker arm assembly lubricating oil duct 9 and an intake rocker arm assembly lubricating oil duct 6, and is sprayed through a forced lubrication outlet to lubricate and cool the exhaust rocker arm assembly 11 and the intake rocker arm assembly 4.
Based on the above, the invention provides a composite lubricating oil path which simultaneously adopts two lubricating modes of oil mist lubrication and forced lubrication, and can ensure sufficient lubrication of each kinematic pair in the valve rocker chamber 5, thereby reducing the problems of abnormal wear of the valve rod part, seizure of friction pairs, breakage of a valve oil seal lip buckle and the like caused by insufficient lubrication, and simultaneously cooling the valve rocker chamber 5 by using cooled lubricating oil. Simultaneously, a cylinder head cover with forced lubrication is provided, thereby providing good lubricating and cooling conditions for the intake and exhaust valve rocker arm assembly, reducing the load of a heat engine, improving the reliability and durability of the intake and exhaust valve rocker arm assembly in the working process, and ensuring the service life and stable performance of the gasoline engine.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. The valve rocker chamber with the composite lubricating oil way comprises a valve rocker chamber formed by covering a cylinder cover and a cylinder head cover, and is characterized in that: the cylinder cover is provided with a cylinder cover oil mist channel and a cylinder cover lubricating oil channel which are communicated with the valve rocker chamber; the top and the side wall of the cylinder head cover are respectively provided with a lubricating oil channel which is communicated with a cylinder head lubricating oil channel on the cylinder head; at least one forced lubricating oil outlet is formed in the top of the cylinder head cover opposite to the air inlet rocker arm assembly and the air exhaust rocker arm assembly, and the forced lubricating oil outlet is communicated with the lubricating oil channel.
2. The valve rocker-arm chamber with a compound lubrication circuit of claim 1, wherein: the cylinder cover oil mist channel and the cylinder cover lubricating oil channel are respectively arranged on two sides of the cylinder cover.
3. The valve rocker-arm chamber with a compound lubrication circuit of claim 1, wherein: at least one forced lubricating oil outlet is respectively arranged on two sides of the bottom surface of the top of the cylinder head cover.
4. The valve rocker-arm chamber with a compound lubrication circuit of claim 1, wherein: the forced lubrication outlet is arranged right opposite to the rocker arm.
5. The valve rocker-arm chamber with a compound lubrication circuit of claim 1, wherein: the cylinder cover oil mist channel and the cylinder cover lubricating oil channel are through holes which are vertically arranged and vertically run through the cylinder cover.
6. The valve rocker-arm chamber with a compound lubrication circuit of claim 1, wherein: the bottom outlet of the lubricating oil channel on the side wall of the cylinder head cover is opposite to and communicated with the top outlet of the lubricating oil channel of the cylinder head.
7. The valve rocker-arm chamber with a compound lubrication circuit of claim 1, wherein: only one oil mist channel of the cylinder cover and one lubricating oil channel of the cylinder cover are arranged.
8. A cylinder head cover characterized in that: two sides of the top of the cylinder head cover are provided with component lubricating oil channels corresponding to the positions of the air inlet rocker arm component and the exhaust rocker arm component respectively, a forced oil outlet is formed in each component lubricating oil channel, and the component lubricating oil channels on the two sides are communicated through a middle lubricating oil channel; a lubricating oil passage communicated with any component lubricating oil passage or the middle lubricating oil passage is arranged on the side wall of the cylinder head cover; the middle lubricating oil channel and the lubricating oil channel are respectively provided with one, and the number of the lubricating oil channels of the assembly is two.
9. The cylinder head cover of claim 8, wherein: the assembly lubricating oil passage is vertically communicated with the middle lubricating oil passage.
10. The cylinder head cover of claim 8, wherein: the component oil duct is disposed parallel to both side edges of the head cover, and preferably has a length not exceeding one-half of the length of the side edge adjacent thereto among both side edges of the head cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920017771.XU CN209781053U (en) | 2019-01-07 | 2019-01-07 | Valve rocker chamber and cylinder head cover with composite lubricating oil path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920017771.XU CN209781053U (en) | 2019-01-07 | 2019-01-07 | Valve rocker chamber and cylinder head cover with composite lubricating oil path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209781053U true CN209781053U (en) | 2019-12-13 |
Family
ID=68792196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920017771.XU Active CN209781053U (en) | 2019-01-07 | 2019-01-07 | Valve rocker chamber and cylinder head cover with composite lubricating oil path |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209781053U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578162A (en) * | 2019-01-07 | 2019-04-05 | 浙江康思特动力机械有限公司 | With the valve rocker room of composite lubricated oil circuit and valve mechanism cover |
-
2019
- 2019-01-07 CN CN201920017771.XU patent/CN209781053U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578162A (en) * | 2019-01-07 | 2019-04-05 | 浙江康思特动力机械有限公司 | With the valve rocker room of composite lubricated oil circuit and valve mechanism cover |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107178400B (en) | Three-cylinder engine lubricating system | |
| CN209781053U (en) | Valve rocker chamber and cylinder head cover with composite lubricating oil path | |
| CN1318739C (en) | Crankcase scavenged internal combustion engine | |
| CN210799066U (en) | Arrangement structure of engine cylinder block lubricating oil way | |
| CN208010914U (en) | A kind of piston rod device and engine system | |
| CN109578162A (en) | With the valve rocker room of composite lubricated oil circuit and valve mechanism cover | |
| JP3890857B2 (en) | Piston lubrication structure | |
| CN204691848U (en) | A kind of engine housing lubricating oil path | |
| CN211038851U (en) | Cooling oil duct of single-cylinder air-cooled motorcycle engine | |
| CN100348841C (en) | Lubrication system for an internal combustion engine | |
| CN209780993U (en) | Forced lubricating oil way system of engine | |
| CN111997776A (en) | High-efficient lubricated piston link assembly | |
| CN202091146U (en) | Matching structure of air-suction silencer and cylinder cover of compressor | |
| CN201420582Y (en) | Injection fuel line of right box lubrication and piston cooling of motorcycle engine | |
| CN113175371B (en) | Silent diesel engine capable of realizing miniaturization and light weight | |
| JPS6125906A (en) | Lubricating device for engine | |
| CN200955414Y (en) | Cylinder-cover oil-circuit structure of automobile engine | |
| CN213088124U (en) | Crankcase and two-stroke gasoline engine | |
| CN201031721Y (en) | Oilchannel for lubricating motorcycle engine right box body and cooling piston | |
| CN214464576U (en) | Compact engine cylinder block oil duct structure | |
| CN214499749U (en) | Thin oil lubricated connecting rod oil retaining structure | |
| CN219159129U (en) | Air passage structure of oil-free compressor | |
| CN215949666U (en) | Engine cylinder head | |
| CN216767503U (en) | Engine and cylinder cap, rocking arm subassembly thereof | |
| CN216811864U (en) | Piston cooling nozzle assembly and V-shaped engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |