CN110700913A - Plastic spacer bush of engine rocker shaft and manufacturing method thereof - Google Patents
Plastic spacer bush of engine rocker shaft and manufacturing method thereof Download PDFInfo
- Publication number
- CN110700913A CN110700913A CN201910904662.4A CN201910904662A CN110700913A CN 110700913 A CN110700913 A CN 110700913A CN 201910904662 A CN201910904662 A CN 201910904662A CN 110700913 A CN110700913 A CN 110700913A
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- spacer bush
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- 125000006850 spacer group Chemical group 0.000 title claims abstract description 104
- 239000004033 plastic Substances 0.000 title claims abstract description 24
- 229920003023 plastic Polymers 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 claims abstract description 20
- 238000003754 machining Methods 0.000 claims abstract description 16
- 238000001746 injection moulding Methods 0.000 claims abstract description 13
- 239000012815 thermoplastic material Substances 0.000 claims abstract description 13
- 239000003365 glass fiber Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 16
- 238000007514 turning Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 6
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 229920006153 PA4T Polymers 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229920006119 nylon 10T Polymers 0.000 claims description 3
- 229920006128 poly(nonamethylene terephthalamide) Polymers 0.000 claims description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 13
- 239000010959 steel Substances 0.000 abstract description 13
- 230000004323 axial length Effects 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000004677 Nylon Substances 0.000 description 5
- 229920001778 nylon Polymers 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
- B29C2045/0058—Shaping removing material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The plastic spacer bush of the rocker arm shaft of the engine is of a circular tubular structure, is manufactured by the procedures of injection molding, heat treatment, machining and the like of a glass fiber reinforced thermoplastic material PA6T, has good stability of dimensional accuracy of axial length and inner diameter under the working conditions of cold and heat of the engine, can completely replace a steel spacer bush, and has the advantages of low price, light weight and good rigidity compared with the traditional steel spacer bush.
Description
Technical Field
The invention relates to a spacer bush of a rocker arm shaft of a heavy diesel engine and a manufacturing method of the spacer bush, belonging to the technical field of spacer bushes of the rocker arm shaft of the engine.
Background
The commercial vehicle diesel engine air intake and exhaust integrated rocker arm shaft is sleeved with a spacer sleeve, the spacer sleeve and the rocker arm seat form a rotating friction pair, and the functions of positioning the air intake and exhaust rocker arms and preventing axial movement are achieved. Because the opening and closing actions of the air inlet valve and the exhaust valve are related, the size precision of the axial length and the inner diameter of the spacer sleeve is high, and the change of the axial length is small when the spacer sleeve expands with heat and contracts with cold. At present, a steel spacer bush is adopted by a rocker shaft spacer bush of an engine, and the weight of the steel spacer bush is large, so that the light weight of the engine is restricted.
Taking an integral air inlet rocker shaft spacer bush of a certain high-horsepower diesel engine as an example, the axial length tolerance of the spacer bush is 49 +/-0.05 mm, the inner diameter phi 31.08 mm-phi 31.18mm is required to endure an oil-moisture environment at the temperature of-40 ℃ to +150 ℃, the thermal expansion amount at the temperature of 25 ℃ to 150 ℃ is less than or equal to 0.10mm, and the abrasion loss of a reinforced rack spacer bush of the engine in 1000 hours is less than or equal to 0.06 mm.
At present, no case or report that a rocker arm shaft adopts a plastic spacer sleeve is found, and the reason is that: 1. the dimensional accuracy of common plastics (such as PA6 and PA66) and the dimensional stability under cold and hot environments are far from the difference of steel products, so that the common plastics cannot replace the steel products; 2. some advanced special plastics (such as PEEK and PI) are too expensive in material price, and have extremely low value in commercial application.
Chinese patent application "application number: 201811592842, name: the processing method of the crusher shaft sleeve provides a processing method of a crusher plastic shaft sleeve, and the shaft sleeve is a cylindrical mechanical part sleeved on a crusher rotating shaft and plays a role in adjusting the operation of equipment. The parts are formed by polymerization of caprolactam, heat treatment and machining, and are suitable for processing large shaft sleeves (commonly known as MC nylon sleeves and cast nylon sleeves), wherein the heat treatment is to carry out oil bath treatment on blank pieces of cast nylon, the oil temperature is kept at 175-180 ℃, then the blank pieces are slowly cooled, the heat treatment time is 15 minutes per 1mm thickness of oil bath, the preferential heat treatment also comprises the water bath treatment in 95 ℃ of water after the oil bath, and the heat treatment time is 15 minutes per 1mm thickness of water bath. However, such plastic sleeves have low rigidity, large linear thermal expansion and high price, and are not suitable for replacing steel rocker arm shaft spacers. The oil bath and water bath heat treatment process is mainly used for filling oil and water to the cast nylon parts, improving the water absorption of the cast nylon to achieve the purpose of stabilizing the geometric dimensions of the parts, and improving the mechanical properties and the lubricity of the parts. The process is not suitable for parts like an engine spacer bush with repeatedly alternated cold and heat, the evaporation of water and oil gas in the spacer bush is promoted by high temperature, the fluctuation of the inner diameter size is still overlarge, and the requirement of the performance of the engine spacer bush is not met.
Disclosure of Invention
The invention aims to provide a spacer bush made of plastic and a method for manufacturing the spacer bush, aiming at the defects of the prior art of the spacer bush of the rocker arm shaft of the diesel engine.
In order to achieve the purpose, the technical solution of the invention is as follows:
the engine rocker shaft plastic spacer bush is of a circular tubular structure; the spacer bush is manufactured by the steps of injection molding, heat treatment, machining and the like of glass fiber reinforced thermoplastic material PA 6T.
Preferably, the outer rings of the front end and the rear end of the spacer bush are respectively provided with an annular side flange, the side wall of the spacer bush is provided with an axially-penetrating opening, the cross section of the spacer bush is C-shaped at the moment, and the angle of the opening is 60-120 degrees; or a plurality of axial strip-shaped lightening holes are equally distributed on the side wall of the spacer bush along the circumferential surface.
Preferably, the raw material of the spacer is replaced by thermoplastic materials PA4T, PA9T, PA10T, PPS, PEEK, PI, LCP and PSU.
The method for manufacturing the plastic spacer comprises the following steps:
a. preparing a raw material, namely preparing a glass fiber reinforced thermoplastic material PA6T with the density of 1.40-1.80, the linear expansion coefficient of the material in the flowing direction of less than or equal to 3 multiplied by 10 < -5 > and the linear expansion coefficient of the material in the vertical flowing direction of less than or equal to 8 multiplied by 10 < -5 >;
b. injection molding, wherein a sprue of a mold is positioned right in front of one annular end face of the spacer bush, and during injection molding, PA6T melt flows from one end of the spacer bush to the other end along the axial direction through the sprue, so that the axial length expansion of the spacer bush can be minimized;
c. heat treatment, namely placing the injection-molded spacer bush in hot air at the temperature of 150-240 ℃ for standing treatment for 2-16 hours, so that the crystal form of the PA6T material is stable, and the residual stress in the product is eliminated; then naturally cooling to ensure that the spacer sleeve obtains an ideal size stabilizing effect;
d. and (4) machining, namely performing micro turning and grinding machining on the end surfaces and the inner holes on the two sides of the spacer bush by adopting a conventional plastic part machining mode.
Preferably, the thermoplastic material used in step a is a glass fiber reinforced thermoplastic resin PA6T having a density of 1.65, a coefficient of linear expansion of the material in the flow direction of 1.3X 10-5 and a coefficient of linear expansion of 4.2X 10-5 in the direction perpendicular to the flow direction.
Preferably, 3 gates are uniformly distributed right in front of the annular end face of the spacer sleeve along the circumference, and a circle formed by the 3 gates and the annular end face are coaxial.
Preferably, the temperature of the heat treatment in step c is 210 ℃. + -. 5 ℃ and the duration is 2.5 hours. + -. 0.5 hours.
Compared with the prior art, the invention has the beneficial effects that:
1. the plastic spacer bush has good stability of dimensional accuracy of axial length and inner diameter under the cold and hot working conditions of the engine, can completely replace a steel spacer bush, and has the advantages of low price, light weight and good rigidity compared with the traditional steel spacer bush.
2. The plastic spacer bush is provided with the axially-through opening on the side wall, so that the material is saved, the weight is reduced, and the assembly and the replacement of the spacer bush are facilitated.
3. The side wall of the plastic spacer bush is provided with the axial strip-shaped lightening hole, so that the material is further saved, and the weight is reduced.
Drawings
FIG. 1 is a schematic view of a first construction of a spacer according to the present invention;
FIG. 2 is a schematic view of a second construction of the spacer of the present invention;
FIG. 3 is a schematic view of a third construction of the spacer of the present invention.
In the figure: the side wall 1, annular side flange 2, opening 3, bar lightening hole 4.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Referring to fig. 1 to 3, the engine rocker shaft plastic spacer bush is of a circular tubular structure; the spacer bush is manufactured by the steps of injection molding, heat treatment, machining and the like of glass fiber reinforced thermoplastic material PA 6T.
As a preferable technical scheme, an opening 3 which axially penetrates through is arranged on the side wall 1 of the spacer bush, the cross section of the spacer bush is C-shaped at the moment, and the angle of the opening 3 is 60-120 degrees; or a plurality of axial strip-shaped lightening holes 4 are equally distributed on the side wall 1 of the spacer bush along the circumferential surface.
As a preferable technical scheme, the outer rings of the front end and the rear end of the spacer bush are respectively provided with an annular side flange 2.
As a preferable technical scheme, the raw materials of the spacer can be replaced by thermoplastic materials PA4T, PA9T, PA10T, PPS, PEEK, PI, LCP and PSU.
The method for manufacturing the plastic spacer comprises the following steps:
a. preparing a raw material, namely preparing a glass fiber reinforced thermoplastic material PA6T with the density of 1.40-1.80, the linear expansion coefficient of the material in the flowing direction of less than or equal to 3 multiplied by 10 < -5 > and the linear expansion coefficient of the material in the vertical flowing direction of less than or equal to 8 multiplied by 10 < -5 >;
b. injection molding, wherein a gate of an adopted mold is positioned right ahead of one annular end face of the spacer sleeve, 3 gates are uniformly distributed right ahead of the annular end face of the spacer sleeve along the circumference, and a circle formed by the 3 gates and the annular end face are coaxial; thus, PA6T melt can flow from one side of the spacer to the other along the axis along the 3-point gate, which can minimize the axial length expansion of the spacer; the arrangement position of the pouring gate is the condition that the front end and the rear end of the spacer bush are not provided with the annular side flanges, and when the front end and the rear end of the spacer bush are provided with the annular side flanges, the pouring gate is specifically positioned at the position which is right in front of the annular end surface of the spacer bush and close to the inner hole wall of the spacer bush.
c. Heat treatment, namely placing the injection-molded spacer bush in hot air at the temperature of 150-240 ℃ for standing treatment for 2-16 hours, so that the crystal form of the PA6T material is stable, and the residual stress in the product is eliminated; then naturally cooling to ensure that the spacer sleeve obtains an ideal size stabilizing effect;
d. and (4) machining, namely performing micro turning and grinding machining on the end surfaces and the inner holes on the two sides of the spacer bush by adopting a conventional plastic part machining mode.
As a preferred technical proposal, the thermoplastic material adopted in the step a is a glass fiber reinforced thermoplastic resin PA6T with the density of 1.65, the linear expansion coefficient of the material in the flowing direction of 1.3 multiplied by 10-5 and the vertical flowing direction of 4.2 multiplied by 10-5.
As a preferred technical scheme, the temperature of the heat treatment in the step c is 210 +/-5 ℃, and the duration time is 2.5 hours +/-0.5 hour.
Example 1:
taking the spacer shown in FIG. 1 as an example, the spacer is injection-molded by using a glass fiber reinforced thermoplastic resin PA6T with a density of 1.65, a linear expansion coefficient of the material of 1.3 × 10-5 in the flow direction and a vertical flow direction of 4.2 × 10-5, a mold gate is selected at the intersection of an annular side rib and an inner hole during injection molding, the gate is 3 point gates uniformly distributed along the circumference, and PA6T melt flows from one end of the spacer to the other end along the axis along the 3 point gates so as to ensure that the axial length expansion of the spacer reaches the minimum value. And carrying out heat treatment on the formed spacer bush, wherein the post-treatment temperature of the spacer bush is 210 +/-5 ℃ and the post-treatment time is 2.5 +/-0.5 hours. And the spacer bush is subjected to micro-turning machining and finishing on the end surfaces and the inner hole of the two sides of the spacer bush in a conventional plastic part machining mode, and the part is prevented from contacting moisture during turning. And trimming by a turning machine to enable the axial length and the inner hole diameter to reach the standard.
The effect of heat treatment on the dimensional stability of the PA6T spacer will now be described by way of example of an intake rocker shaft spacer of the construction shown in fig. 1.
The group 1 is produced by a process mode of turning machine and finishing after injection molding, the group 2 is produced by a process mode of heat treatment at 210 +/-5 ℃ for 2.5 +/-0.5 hours after injection molding, and then turning machine and finishing, and the dimensional stability and performance of two groups of parts are shown in tables 1 and 2:
TABLE 1
TABLE 2
As can be seen from tables 1 and 2, after the heat treatment is improved, the dimensional stability of the axial dimension and the inner diameter of the PA6T spacer bush is very good, the influence of repeated cold and hot alternation on the spacer bush is almost negligible, and the dimensional stability improvement effect is obvious.
TABLE 3
Table 3 shows that, taking the spacer bush of the intake rocker shaft with the structure shown in fig. 1 as an example, comparing the steel spacer bush, the spacer bush made of the glass fiber reinforced PA66 material by the common injection molding process with part of indexes of the PA6T spacer bush made by the present patent technology, the spacer bush of the present patent has the advantages of low price, light weight and good rigidity compared with the traditional steel spacer bush, and the axial expansion amount is close to that of the traditional steel spacer bush, so that the spacer bush can completely replace the steel spacer bush, and further the overall weight reduction of the engine is reduced by 0.65 kg.
The above description is provided for the purpose of describing the present invention in more detail with reference to the specific embodiments, and the detailed implementation of the present invention should not be considered as limited to the description, and the simple substitution made by those skilled in the art without departing from the concept of the present invention should be considered as belonging to the protection scope of the present invention.
Claims (7)
1. The engine rocker shaft plastic spacer bush is of a circular tubular structure; the method is characterized in that: the spacer bush is manufactured by the steps of injection molding, heat treatment, machining and the like of glass fiber reinforced thermoplastic material PA 6T.
2. The engine rocker shaft spacer of claim 1, wherein: an axially-through opening is formed in the side wall of the spacer bush, the cross section of the spacer bush is C-shaped, and the angle of the opening is 60-120 degrees; or a plurality of axial strip-shaped lightening holes are equally distributed on the side wall of the spacer bush along the circumferential surface.
3. The engine rocker shaft plastic spacer of claim 1 or 2, wherein: the raw material of the spacer can be replaced by thermoplastic materials PA4T, PA9T, PA10T, PPS, PEEK, PI, LCP and PSU.
4. A method of manufacturing a plastic spacer as claimed in claim 1 or 2, comprising the steps of:
a. preparing a raw material, namely preparing a glass fiber reinforced thermoplastic material PA6T with the density of 1.40-1.80, the linear expansion coefficient of the material in the flowing direction of less than or equal to 3 multiplied by 10 < -5 > and the linear expansion coefficient of the material in the vertical flowing direction of less than or equal to 8 multiplied by 10 < -5 >;
b. injection molding, wherein a gate of an adopted mold is positioned right ahead one annular end face of the spacer bush, and during injection molding, PA6T melt flows from one end of the spacer bush to the other end along the axial direction through the gate;
c. heat treatment, placing the injection molded spacer bush in hot air at 150-240 ℃ for standing treatment for 2-16 hours, and then naturally cooling;
d. and (4) machining, namely performing micro turning and grinding machining on the end surfaces and the inner holes on the two sides of the spacer bush by adopting a conventional plastic part machining mode.
5. The manufacturing method according to claim 4, characterized in that: in the step a, the thermoplastic material adopted is a glass fiber reinforced thermoplastic resin PA6T with the density of 1.65, the linear expansion coefficient of the material in the flowing direction of 1.3 multiplied by 10-5 and the vertical flowing direction of 4.2 multiplied by 10-5.
6. The manufacturing method according to claim 4, characterized in that: in the step b, 3 gates are uniformly distributed right in front of the annular end face of the spacer sleeve along the circumference, and a circle formed by the 3 gates and the annular end face are coaxial.
7. The manufacturing method according to claim 4, characterized in that: in the step c, the temperature of the heat treatment is 210 +/-5 ℃, and the duration time is 2.5 +/-0.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910904662.4A CN110700913B (en) | 2019-09-24 | 2019-09-24 | Plastic spacer bush of engine rocker shaft and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910904662.4A CN110700913B (en) | 2019-09-24 | 2019-09-24 | Plastic spacer bush of engine rocker shaft and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN110700913A true CN110700913A (en) | 2020-01-17 |
| CN110700913B CN110700913B (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910904662.4A Active CN110700913B (en) | 2019-09-24 | 2019-09-24 | Plastic spacer bush of engine rocker shaft and manufacturing method thereof |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113459422A (en) * | 2021-06-30 | 2021-10-01 | 东风商用车有限公司 | Opening spacer bush for engine rocker shaft and manufacturing method thereof |
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| GB481474A (en) * | 1937-06-09 | 1938-03-11 | Herbert Frank Percy Purday | Improvements relating to valve gear of internal combustion engines |
| CN101132657A (en) * | 2007-09-21 | 2008-02-27 | 赵永镐 | Polytetrafluoroethylene heating product and method of manufacturing the same |
| CN103467735A (en) * | 2007-08-24 | 2013-12-25 | Ems专利股份公司 | High temperature polyamide moulding composition reinforced with flat glass fibres |
| CN105537382A (en) * | 2016-02-18 | 2016-05-04 | 沈阳北阳氟塑料有限公司 | Machining bushing for aviation |
| CN109026244A (en) * | 2018-08-03 | 2018-12-18 | 重庆隆鑫发动机有限公司 | The mute air distribution system of engine and engine |
| CN109306917A (en) * | 2013-04-12 | 2019-02-05 | 伊顿公司 | Cylinder cap device for variable valve actuation rocker arm assembly |
| CN110107372A (en) * | 2019-04-23 | 2019-08-09 | 东风商用车有限公司 | A kind of rocker arm axial limit structure |
-
2019
- 2019-09-24 CN CN201910904662.4A patent/CN110700913B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB481474A (en) * | 1937-06-09 | 1938-03-11 | Herbert Frank Percy Purday | Improvements relating to valve gear of internal combustion engines |
| CN103467735A (en) * | 2007-08-24 | 2013-12-25 | Ems专利股份公司 | High temperature polyamide moulding composition reinforced with flat glass fibres |
| CN101132657A (en) * | 2007-09-21 | 2008-02-27 | 赵永镐 | Polytetrafluoroethylene heating product and method of manufacturing the same |
| CN109306917A (en) * | 2013-04-12 | 2019-02-05 | 伊顿公司 | Cylinder cap device for variable valve actuation rocker arm assembly |
| CN105537382A (en) * | 2016-02-18 | 2016-05-04 | 沈阳北阳氟塑料有限公司 | Machining bushing for aviation |
| CN109026244A (en) * | 2018-08-03 | 2018-12-18 | 重庆隆鑫发动机有限公司 | The mute air distribution system of engine and engine |
| CN110107372A (en) * | 2019-04-23 | 2019-08-09 | 东风商用车有限公司 | A kind of rocker arm axial limit structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113459422A (en) * | 2021-06-30 | 2021-10-01 | 东风商用车有限公司 | Opening spacer bush for engine rocker shaft and manufacturing method thereof |
| CN113459422B (en) * | 2021-06-30 | 2022-08-12 | 东风商用车有限公司 | Opening spacer bush for engine rocker shaft and manufacturing method thereof |
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| CN110700913B (en) | 2022-01-25 |
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