CN102797526A - Rocker arm, rocker arm assembly, engine and engineering machinery - Google Patents
Rocker arm, rocker arm assembly, engine and engineering machinery Download PDFInfo
- Publication number
- CN102797526A CN102797526A CN2012103160200A CN201210316020A CN102797526A CN 102797526 A CN102797526 A CN 102797526A CN 2012103160200 A CN2012103160200 A CN 2012103160200A CN 201210316020 A CN201210316020 A CN 201210316020A CN 102797526 A CN102797526 A CN 102797526A
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- rocker arm
- valve
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- rocker
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- 239000010705 motor oil Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention provides a rocker arm, which is matched with the valve of an engine. The rocker arm comprises a rocker arm body and a head part, wherein the head part is arranged at one end of the rocker arm body, which is matched with the valve; and the head part is a double curved surface. The invention further provides a rocker arm assembly, the engine and engineering machinery. When the rocker arm with the structure is matched with the valve, a contact line of the head part and the valve is always on the center line of the valve, so that the problem of eccentric abrasion of a duct and a housing washer of the valve is solved, and the problems of valve leakage, steam blowby increase of a crankcase and engine oil blowby existing in relevant technologies are avoided. Therefore, the stability and the safety of the engine are improved.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to an engine rocker arm, a rocker arm assembly, an engine and engineering machinery.
Background
At present, the head of a traditional valve rocker is in a regular arc surface shape, and the distance between a contact line of the head of the rocker and the tail of a valve stem relative to the center of a valve is constantly changed in the motion process of the valve rocker. As shown in fig. 1, in the whole valve opening process of a 3L four-valve diesel engine, at the beginning, the offset distance of the contact line of a rocker arm 1 'and a valve 2' relative to a valve center line 3 'is a'; as shown in fig. 2, in the maximum valve lift, the offset distance between the contact line of the rocker arm 1 ' and the valve 2 ' relative to the valve center line 3 ' is b ', wherein the distance from the valve center line 3 ' to the center of the rocker shaft hole is s, and the perpendicular distance between the valve end surface and the rocker shaft center is L.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems: in the whole opening process of the valve, a contact line of the rocker arm and the valve is always deviated from a valve central line (except for the central line which is passed through instantly in the motion process), and the valve is always acted by a lateral force component, so that the valve guide pipe and the valve seat ring are easily worn eccentrically, the valve leaks gas, the crankcase gas blowby is increased, and engine oil is blown by.
Disclosure of Invention
The invention provides the rocker arm based on the problems in the related technology, the head of the rocker arm is in a hyperbolic surface shape, when the rocker arm with the structure is matched with a valve for use, a contact line of the head of the rocker arm and the valve is always on a central line of the valve, the problem of eccentric wear of a valve guide pipe and a valve seat ring is solved, the problems or at least one of the problems of valve air leakage, increased crankcase air blowby amount, engine oil blowby and the like in the related technology is avoided, and the stability and the safety of an engine are improved.
In view of the above, the present invention provides a rocker arm, which is adapted to cooperate with a valve of an engine, and comprises a rocker arm body and a head portion of the rocker arm, wherein the head portion of the rocker arm is arranged at one end of the rocker arm body which is adapted to cooperate with the valve, and the head portion of the rocker arm is a hyperboloid.
By adopting the technical scheme, the arm head is designed into a double-curved surface shape, the contact line between the head of the rocker arm and the valve is ensured to be on the central line of the valve, the problems of valve leakage, increased crankcase gas blowby amount and engine oil blowby are solved, and the safety and the stability of the valve are improved.
In the above technical solution, preferably, the head of the rocker arm is press-fit with the rocker arm body. By adopting the technical scheme, the head of the rocker arm is matched with the rocker arm body in a press-in type. Simple and convenient, and saves time and labor.
In the above technical solution, preferably, the head of the rocker arm is in threaded fit with the rocker arm body. By adopting the technical scheme, the head of the rocker arm is in threaded fit with the rocker arm body. Simple manufacture, and convenient installation and disassembly.
The invention also provides a rocker arm assembly, which comprises a valve and the rocker arm, wherein the valve comprises a valve body and a valve rod, the bottom end of the valve rod is connected with the valve body, the top end of the valve rod is matched with the head of the rocker arm, the rocker arm body is arranged on an engine body through a rocker arm shaft, and the contact line between the head of the rocker arm and the valve rod meets the formula
y2=a2+x2 （A）
Wherein y is the distance from the contact line to the axis of the rocker shaft; a is the vertical distance between the central line of the connecting rod and the axis of the rocker shaft; and x is the valve stroke.
By adopting the technical scheme, the contact line of the head of the rocker arm and the valve is ensured to be on the central line of the valve, the conditions of air leakage and oil channeling are avoided, and the use safety and stability of the engine are improved.
In the above technical solution, preferably, the head of the rocker arm is hyperbolic. By adopting the technical scheme, the problems of air leakage of the valve, increase of air blowby quantity of a crankcase and oil blowby are solved, and the safety and the stability of the valve are improved.
In the above technical solution, preferably, the head of the rocker arm is press-fit with the rocker arm body. By adopting the technical scheme, the head of the rocker arm is matched with the rocker arm body in a press-in type, so that the rocker arm is simple, convenient, time-saving and labor-saving.
In the above technical solution, preferably, the head of the rocker arm is in threaded fit with the rocker arm body. By adopting the technical scheme, the head of the rocker arm is in threaded fit with the rocker arm body, the manufacturing is simple, and the installation and the disassembly are convenient.
Furthermore, the invention also provides an engine comprising the rocker arm assembly. Having the full beneficial effect of a rocker arm assembly.
In the above technical solution, preferably, the engine is a gasoline engine or a diesel engine.
In addition, the invention also provides engineering machinery comprising the engine. Has the whole beneficial effects of the engine.
In summary, according to the rocker arm provided by the invention, the head of the rocker arm is designed to be the hyperbolic surface shape, when the head of the rocker arm is matched with the valve for use, the contact line of the head of the rocker arm and the valve is always on the central line of the valve, the eccentric wear problem of a valve guide pipe and a valve seat ring is solved, the problems of valve air leakage, increase of crankcase air blowby and oil blowby in the related art are avoided, and the stability and the safety of an engine are improved.
Drawings
FIG. 1 is a schematic illustration of a rocker arm assembly of the related art;
FIG. 2 is a schematic view showing a state at the time of maximum lift of the valve in the structure shown in FIG. 1;
FIG. 3 illustrates a schematic structural view of one embodiment of a rocker arm assembly according to the present invention;
FIG. 4 is a schematic view showing a state at the time of maximum lift of the valve in the structure shown in FIG. 3;
FIG. 5 shows a schematic assembly of an embodiment of an engine according to the present disclosure.
In the figure: the correspondence between reference numbers and component names in fig. 1 and 2 is:
1 ' rocker arm 2 ' valve 3 ' valve centre line
The correspondence between the reference numerals and the names of the components in fig. 3 to 5 is:
1 rocker arm, 2 valves, 3 rocker arm shafts, 4 valve guide pipes and 5 valve seat rings
6 cylinder cover 7 valve spring 8 push rod
11 rocker arm body 12 rocker arm head 21 valve body 22 valve stem
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 3 and 4, the present invention provides a rocker arm 1, which is fitted with a valve 2 of an engine, wherein the rocker arm 1 comprises a rocker arm body 11 and a head 12 of the rocker arm, the head 12 of the rocker arm is arranged at one end of the rocker arm body 11, which is fitted with the valve 2, and the head 12 of the rocker arm is a hyperboloid.
By adopting the technical scheme, the head of the rocker arm is designed into a hyperboloid shape, so that the contact line of the head of the rocker arm and the valve is ensured to be on the central line of the valve, the problems of valve leakage, increased crankcase gas blowby amount and engine oil blowby are solved, and the safety and the stability of the valve are improved.
Preferably, the head 12 of the rocker arm is press-fit with the rocker arm body 11.
By adopting the technical scheme, the head of the rocker arm is matched with the rocker arm body in a press-in type. Simple and convenient, and saves time and labor.
Preferably, the head 12 of the rocker arm is in threaded engagement with the rocker arm body 11.
By adopting the technical scheme, the head of the rocker arm is in threaded fit with the rocker arm body. Simple manufacture, and convenient installation and disassembly.
As shown in fig. 3 and 4, the present invention further provides a rocker arm assembly, which comprises a valve 2 and the rocker arm 1, wherein the valve 2 comprises a valve body 21 and a valve stem 22, the bottom end of the valve stem 22 is connected with the valve body 21, the top end of the valve stem 22 is matched with the head 12 of the rocker arm, the rocker arm body 11 is mounted on an engine body through a rocker shaft 3, and a contact line between the head 12 of the rocker arm and the valve stem 22 satisfies a formula
y2=a2+x2 （A）
Wherein y is the distance from the contact line to the axis of the rocker shaft; a is the vertical distance between the central line of the connecting rod and the axis of the rocker shaft; and x is the valve stroke.
By adopting the technical scheme, the contact line of the head of the rocker arm and the valve is ensured to be on the central line of the valve, the conditions of air leakage and oil channeling are avoided, and the use safety and stability of the engine are improved.
Preferably, the head 12 of the rocker arm is hyperboloid shaped. By adopting the technical scheme, the problems of air leakage of the valve, increase of air blowby quantity of a crankcase and oil blowby are solved, and the safety and the stability of the valve are improved.
Preferably, the head 12 of the rocker arm is press-fit with the rocker arm body 13.
By adopting the technical scheme, the head of the rocker arm is matched with the rocker arm body in a press-in type, so that the rocker arm is simple, convenient, time-saving and labor-saving.
Preferably, the head 12 of the rocker arm is in threaded engagement with the rocker arm body 11. By adopting the technical scheme, the head of the rocker arm is in threaded fit with the rocker arm body, the manufacturing is simple, and the installation and the disassembly are convenient.
Other dimensions and positions of the rocker arm of the 3L engine are unchanged, and as shown in fig. 3, the shape of the head of the rocker arm can be derived mathematically:
y2=a2+x2 （A）
wherein: y is the distance from the contact line to the axis of the rocker shaft; a is the vertical distance between the central line of the connecting rod and the axis of the rocker shaft; and x is the valve stroke.
From the formula (A), the curve is hyperbolic. In actual design, assembly tolerance needs to be considered, and mainly includes the position degree of a cylinder cover and a rocker arm fixing bolt and the position degree of a valve guide pipe and a cylinder cover positioning reference. The data in equation (a) may be modified based on actual tolerances.
For example, as shown in fig. 3, when a =40mm, as the valve is moving, when the valve stem tail is just in contact with the rocker arm, the position of the contact line: x1=2.2mm, y1=40.06mm, wherein a, x1, y1 correspond to a, x, y in formula (a), respectively;
for example, as shown in fig. 4 (fig. 4 only shows the wear-resistant head portion of the rocker arm in the valve stroke), at the maximum lift position of the valve, x2=3.5mm, y2=40.15mm, and a =40mm, wherein a, x2, and y2 correspond to a, x, and y in the formula (a), respectively.
In the process of movement, the horizontal distance from the contact line to the central line of the rocker shaft is always 40, namely, the horizontal distance is always on the central line of the valve, so that the stress of the valve is uniform, and the eccentric wear of a valve guide pipe and a seat ring is reduced.
As shown in FIG. 5, the present invention further provides an engine including the rocker arm assembly of the above-described embodiment. In fig. 5, the engine includes a valve guide 4, a valve retainer 5, a cylinder head 6, a valve spring 7, and a push rod 8.
By adopting the technical scheme provided by the invention, when the rocker arm 1 is matched with the valve 2 for use, the contact line of the rocker arm head 12 and the valve rod 22 is always on the central line of the valve rod 2, so that the eccentric wear problem of the valve guide pipe 4 and the valve seat ring 5 is solved, the problems of valve air leakage, increased crankcase air blowby amount and engine oil blowby in the related technology are avoided, and the stability and the safety of an engine are improved.
Preferably, the engine is a gasoline engine or a diesel engine.
In addition, the invention also provides engineering machinery comprising the engine in the embodiment. Has the whole beneficial effects of the engine.
In summary, in the rocker arm according to the present invention, the head portion of the rocker arm is formed in a hyperboloid shape, and when the head portion of the rocker arm is used in cooperation with the valve, a contact line between the head portion of the rocker arm and the valve is always on a center line of the valve. The eccentric wear problem between the valve guide pipe and the valve seat ring is solved, the problems of valve air leakage, crankcase air blowby quantity increase and engine oil blowby in the related technology are avoided, and the stability and the safety of the engine are improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A rocker arm, cooperate with valve (2) of engine, characterized in that, the rocker arm includes rocker arm body (11) and head (12) of rocker arm, the head (12) of rocker arm set up in rocker arm body (11) with valve (2) matched with one end, head (12) of rocker arm is the hyperboloid.
2. The rocker arm according to claim 1, characterized in that the head (12) of the rocker arm is press-in fitted with the rocker arm body (11).
3. The rocker arm according to claim 1, characterized in that the head (12) of the rocker arm is screw-fitted with the rocker arm body (11).
4. A rocker arm assembly comprising a valve (2), characterized in that it further comprises a rocker arm according to any one of claims 1 to 3, said valve (2) comprising a valve body (21) and a valve stem (22), said valve stem (22) having a bottom end connected to said valve body (21) and a top end cooperating with a head (12) of said rocker arm, said rocker arm body (11) being mounted on an engine block by means of a rocker shaft (3), the line of contact between said rocker arm head (12) and said valve stem (22) satisfying the formula
y2=a2+x2 （A）
Wherein,
y is the distance from the contact line to the axis of the rocker shaft;
a is the vertical distance between the central line of the connecting rod and the axis of the rocker shaft;
and x is the valve stroke.
5. The rocker arm assembly of claim 4, wherein the head portion (12) of the rocker arm is hyperboloid-shaped.
6. The rocker arm assembly of claim 5, wherein the rocker arm head (12) is press-fit with the rocker arm body (11).
7. The rocker arm assembly of claim 5, wherein the head (12) of the rocker arm is screw-threaded with the rocker arm body (11).
8. An engine including a rocker arm assembly as claimed in any one of claims 4 to 7.
9. The engine of claim 8, wherein the engine is a gasoline engine or a diesel engine.
10. A working machine, characterized by comprising an engine according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316020.0A CN102797526B (en) | 2012-08-30 | 2012-08-30 | Rocker arm, rocker arm assembly, engine and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316020.0A CN102797526B (en) | 2012-08-30 | 2012-08-30 | Rocker arm, rocker arm assembly, engine and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102797526A true CN102797526A (en) | 2012-11-28 |
| CN102797526B CN102797526B (en) | 2015-04-15 |
Family
ID=47196800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210316020.0A Active CN102797526B (en) | 2012-08-30 | 2012-08-30 | Rocker arm, rocker arm assembly, engine and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102797526B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257236A (en) * | 2015-06-17 | 2016-12-28 | 华晨汽车集团控股有限公司 | A kind of method of conversed analysis internal combustion engine hydraulic tappet position |
| CN106382139A (en) * | 2016-10-21 | 2017-02-08 | 东风商用车有限公司 | Air valve eccentric wear prevention air distribution mechanism with spherical structure and use method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4476822A (en) * | 1983-05-23 | 1984-10-16 | General Motors Corporation | Hypocyclic rolling contact rocker arm and pivot |
| JPH0849510A (en) * | 1994-08-04 | 1996-02-20 | Yanmar Diesel Engine Co Ltd | Intake-exhaust valve arm structure for engine |
| US20040089256A1 (en) * | 2002-11-07 | 2004-05-13 | Koyo Seiko Co., Ltd. | Rocker arm |
| JP2007085279A (en) * | 2005-09-22 | 2007-04-05 | Otics Corp | Rocker arm |
| CN201891455U (en) * | 2010-11-18 | 2011-07-06 | 上海汽车集团股份有限公司 | Lift adjusting mechanism of engine valve |
| CN102345478A (en) * | 2010-08-02 | 2012-02-08 | 谢夫勒科技有限责任两合公司 | Drag lever |
-
2012
- 2012-08-30 CN CN201210316020.0A patent/CN102797526B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4476822A (en) * | 1983-05-23 | 1984-10-16 | General Motors Corporation | Hypocyclic rolling contact rocker arm and pivot |
| JPH0849510A (en) * | 1994-08-04 | 1996-02-20 | Yanmar Diesel Engine Co Ltd | Intake-exhaust valve arm structure for engine |
| US20040089256A1 (en) * | 2002-11-07 | 2004-05-13 | Koyo Seiko Co., Ltd. | Rocker arm |
| JP2007085279A (en) * | 2005-09-22 | 2007-04-05 | Otics Corp | Rocker arm |
| CN102345478A (en) * | 2010-08-02 | 2012-02-08 | 谢夫勒科技有限责任两合公司 | Drag lever |
| CN201891455U (en) * | 2010-11-18 | 2011-07-06 | 上海汽车集团股份有限公司 | Lift adjusting mechanism of engine valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257236A (en) * | 2015-06-17 | 2016-12-28 | 华晨汽车集团控股有限公司 | A kind of method of conversed analysis internal combustion engine hydraulic tappet position |
| CN106257236B (en) * | 2015-06-17 | 2019-03-05 | 华晨汽车集团控股有限公司 | A kind of method of conversed analysis internal combustion engine hydraulic tappet position |
| CN106382139A (en) * | 2016-10-21 | 2017-02-08 | 东风商用车有限公司 | Air valve eccentric wear prevention air distribution mechanism with spherical structure and use method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102797526B (en) | 2015-04-15 |
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Effective date of registration: 20160304 Address after: The Yangcheng Lake Road Development Zone in Kunshan City, Jiangsu province 214300 No. 9999 room 7 Patentee after: Kunshan 31 Power Co., Ltd. Address before: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee before: Sanyi Heavy Industry Co., Ltd. |