CN110985154A - Rocker arm structure, engine and motorcycle - Google Patents
Rocker arm structure, engine and motorcycle Download PDFInfo
- Publication number
- CN110985154A CN110985154A CN201911348114.4A CN201911348114A CN110985154A CN 110985154 A CN110985154 A CN 110985154A CN 201911348114 A CN201911348114 A CN 201911348114A CN 110985154 A CN110985154 A CN 110985154A
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- China
- Prior art keywords
- rocker arm
- shaft
- camshaft
- rocker
- arm body
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- 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.)
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- 238000005096 rolling process Methods 0.000 claims description 21
- 238000009434 installation Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010959 steel 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
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
- F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat type
-
- 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
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/04—Reducing noise
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention relates to a rocker arm structure, an engine and a motorcycle, comprising: a rocker shaft; the rocker arm body is rotatably arranged on the rocker arm shaft; the elastic torsion piece is arranged on the rocker arm shaft and is connected with the rocker arm body; and one end of the rocker arm body, which is connected with the elastic torsion piece, is arranged on the cam shaft. When camshaft rotary drive rocking arm body reciprocating swing, the rocking arm body can compress tightly the contact with the camshaft flexibility all the time, and the rocking arm body can not take place rigid collision with the camshaft and produce the noise, therefore just can not influence the driving of motorcycle and experience, also can prevent simultaneously that striking from appearing in rocking arm body and camshaft, does benefit to the performance and the life-span that promote engine and motorcycle.
Description
Technical Field
The invention relates to the technical field of motorcycles, in particular to a rocker arm structure, an engine and a motorcycle.
Background
When the engine of motorcycle igniteed the action, specifically through the cooperation of rocking arm and camshaft, realize the swing of rocking arm, and then drive the valve structure work of rocking arm one end. Because the valve, the rocking arm, relevant spare part of engines such as camshaft can produce certain deformation because of expend with heat and contract with cold at the course of the work, therefore, under actual design state, need leave certain clearance between the part, avoid part heat altered shape and lead to mutual extrusion, therefore, can leave certain clearance between rocking arm and the camshaft, the existence in this clearance can lead to the motorcycle in-process of traveling, rocking arm and camshaft take place the rigidity collision, not only can produce great noise, influence the vehicle and use experience, the striking can increase part contact surface fatigue damage simultaneously, cause the motorcycle to use the reliability to reduce.
Disclosure of Invention
Based on this, it is necessary to provide a rocking arm structure, engine and motorcycle, aims at solving prior art rocking arm and camshaft striking noise big, influences the use and experiences, and takes place the problem of striking damage easily.
The technical scheme is as follows:
in one aspect, the present application provides a rocker arm structure, comprising:
a rocker shaft;
the rocker arm body is rotatably arranged on the rocker arm shaft;
the elastic torsion piece is arranged on the rocker arm shaft and is connected with the rocker arm body;
and
the rocker arm body is connected with the elastic torsion piece, and one end of the rocker arm body connected with the elastic torsion piece is arranged on the cam shaft.
The rocker arm structure of the above scheme is applied and installed in an engine of a motorcycle to assist the operation of the valve mechanism 70, and functions to eliminate a gap between the rocker arm and the camshaft and prevent the rocker arm from rigidly colliding with the camshaft. Specifically, the rocker arm body is mounted on the rocker arm shaft and can rotate around the rocker arm shaft; because the rocker shaft is also provided with the elastic torsion piece which is connected with the rocker body, the rocker body can be always tightly pressed on the camshaft under the action of the output torsion pressure of the elastic torsion piece, and the pressing connection relation is flexible and floating, namely the rocker body and the camshaft can be prevented from generating rigid contact in the working process through the torsional deformation of the elastic torsion piece. Therefore, when the camshaft rotates to drive the rocker arm body to swing in a reciprocating mode, the rocker arm body can be in flexible pressing contact with the camshaft all the time, the rocker arm body cannot be in rigid collision with the camshaft to generate noise, driving experience of the motorcycle cannot be influenced, meanwhile, the rocker arm body and the camshaft can be prevented from being collided, and usability and service life of an engine and the motorcycle are improved.
The technical solution of the present application is further described below:
in one embodiment, the rocker arm structure further comprises a rolling element, an installation notch is formed in one end, close to the camshaft, of the rocker arm body, the rolling element is installed in the installation notch in a rolling mode and is in pressure connection with the camshaft, and the elastic torsion element is abutted to the rolling element.
In one embodiment, the rolling elements are needle bearings.
In one embodiment, the roller of the needle bearing is formed with a shaft hole, and the elastic torsion piece includes a first hooking end inserted into the shaft hole.
In one embodiment, the rocker arm structure further includes a fastening element, the elastic torsion element further includes a main body connected to the first hook end and a second hook end connected to the main body, the fastening element is fixedly disposed on the rocker arm shaft, the main body is disposed on the rocker arm shaft, and the second hook end is connected to the fastening element.
In one embodiment, the rocker shaft is provided with a screw hole, and the fastening member is a fastening bolt screwed in the screw hole.
In one embodiment, the bolt head of the fastening bolt is provided with a groove, and the second hooking end is hooked and fixed in the groove.
In one embodiment, the main body is of a spiral structure, and the main body is sleeved on the rocker arm shaft and clamped and fixed between the fastener and the rocker arm body.
In another aspect, the present application further provides an engine including a rocker arm structure as described above.
Furthermore, the present application also provides a motorcycle including the engine as described above.
Drawings
Fig. 1 is a schematic structural diagram of a rocker arm structure according to an embodiment of the present invention;
FIG. 2 is an exploded view of the rocker shaft, rocker body, torsion spring and fastener according to one embodiment of the present invention;
fig. 3 is a schematic diagram of an assembly structure of a rocker arm structure and a valve train according to an embodiment of the invention.
Description of reference numerals:
10. a rocker shaft; 20. a rocker arm body; 21. installing a notch; 30. an elastic torsion member; 31. a first hooking end; 32. a main body; 33. a second hook end; 40. a camshaft; 50. a rolling body; 51. a shaft hole; 60. a fastener; 61. a trench; 70. a valve train is provided.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "secured to," "disposed on" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the specific manner of fixedly connecting one element to another element can be implemented by the prior art, and will not be described herein, and preferably, a screw-threaded connection is used.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terms "first" and "second" used herein do not denote any particular order or quantity, but rather are used to distinguish one element from another.
The present application claims a motorcycle, which may be any type of motorcycle product on the market, and is not specifically limited herein. It will be understood that the motorcycle, in addition to the frame, the electronic control system, the transmission system, the wheels, also comprises an engine, which acts as the heart of the motorcycle, for providing the power necessary for normal running. As shown in fig. 3, the engine includes a valve train 70 and a rocker arm structure associated therewith. The rocker arm structure is used for driving the valve mechanism 70 to act and do work.
As shown in fig. 1, a rocker arm structure is shown for an embodiment of the present application, which includes: rocker arm shaft 10, rocker arm body 20, elastic torsion piece 30 and camshaft 40. The rocker shaft 10 is used to mount the rocker arm body 20 in an engine case and is made such that the rocker arm body 20 performs a rotary oscillation. The rocker arm body 20 drives the valve mechanism 70 to act and do work through self reciprocating swing. The camshaft 40 is used for driving the rocker arm body 20 to rotate and swing, so that the rocker arm body 20 obtains power. The elastic torsion member 30 is used for providing torsion pressure to the rocker arm body 20, so that the rocker arm body 20 can be always pressed on the camshaft 40.
Specifically, the rocker arm body 20 is rotatably mounted on the rocker arm shaft 10; the elastic torsion piece 30 is arranged on the rocker arm shaft 10 and connected with the rocker arm body 20; one end of the rocker arm body 20 connected with the elastic torsion member 30 is disposed on the camshaft 40.
In summary, the implementation of the technical scheme of the application has the following technical effects: the rocker arm structure of the above-described embodiment is applied to an engine of a motorcycle to operate the auxiliary valve mechanism 70, and functions to eliminate a gap between the rocker arm and the camshaft 40 and prevent the rocker arm from rigidly colliding with the camshaft 40. Specifically, the rocker arm body 20 is mounted on the rocker arm shaft 10 and is rotatable around the rocker arm shaft 10; because the rocker arm shaft 10 is also provided with the elastic torsion member 30, and the elastic torsion member 30 is connected with the rocker arm body 20, the rocker arm body 20 can be always tightly pressed on the camshaft 40 under the action of the torsion pressure output by the elastic torsion member 30, and the pressing relation is flexibly floating, namely, the rigid contact between the rocker arm body 20 and the camshaft 40 in the working process can be avoided through the torsional deformation of the elastic torsion member 30. Therefore, when the camshaft 40 rotates to drive the rocker arm body 20 to swing in a reciprocating manner, the rocker arm body 20 can be in flexible pressing contact with the camshaft 40 all the time, the rocker arm body 20 cannot rigidly collide with the camshaft 40 to generate noise, the driving experience of the motorcycle cannot be influenced, meanwhile, the rocker arm body 20 and the camshaft 40 can be prevented from being collided, and the service performance and the service life of an engine and the motorcycle can be improved.
In this scheme, camshaft 40 usually rotates through drive chain, gear etc. drive, and camshaft 40 relies on the change orbit drive rocking arm body 20 of appearance to wind rocking arm axle 10 swing, later receives the effect of the elasticity torsional pressure of elasticity torsion piece 30, guarantees rocking arm body 20 and camshaft 40 and keeps contacting always, reaches the purpose that prevents to appear collision damage, noise abatement. In the process that the camshaft 40 drives the rocker arm body 20, the rocker arm body 20 and the camshaft 40 slide relatively, and particularly under the condition that the elastic torsion piece 30 is compressed, the rocker arm body 20 and the camshaft 40 are in tight contact, the sliding friction resistance is large, and large friction wear exists after long-term operation.
With reference to fig. 1 and fig. 2, in order to reduce the influence of the friction wear on the service life of the rocker arm structure, in an embodiment, the rocker arm structure further includes a rolling element 50, an installation notch 21 is formed at one end of the rocker arm body 20 close to the camshaft 40, the rolling element 50 is installed in the installation notch 21 in a rolling manner and is in pressure contact with the camshaft 40, and the elastic torsion element 30 abuts against the rolling element 50. Therefore, the rocker arm body 20 can be in pressure contact with the cam shaft 40 through the rolling body 50, the cam shaft 40 drives the rocker arm body 20 to rotate and swing through driving the rolling body 50, and the traditional sliding friction is converted into rolling friction, so that the rocker arm body 20 can be driven to overturn more smoothly and more easily, the driving load of the cam shaft 40 and a motor is reduced, meanwhile, the friction and the abrasion between the rocker arm body 20 and the cam shaft 40 can be greatly reduced, and the part loss and the replacement cost are reduced.
In this embodiment, the rolling elements 50 may be needle bearings. The needle roller bearing can rotate relative to the camshaft 40 during operation, and friction loss can be effectively reduced.
Of course, it should be noted that in other embodiments, the rolling elements 50 may be made of other materials. And the rolling bodies 50 can also be manufactured in other configurations, such as rollers, drums, rollers, etc., which can be chosen according to the actual needs of the person skilled in the art.
Referring to fig. 1, in the present disclosure, the elastic torsion member 30 includes a first hooking end 31, a main body 32 connected to the first hooking end 31, and a second hooking end 33 connected to the main body 32. The main body 32 is used for assembling and connecting with the rocker arm shaft 10, the first hooking end 31 is used for assembling and connecting with the needle bearing, and the second hooking end 33 is also used for assembling and fixing with the rocker arm shaft 10. It is understood that the torsion spring 30 is made of an elastic material, such as but not limited to, a plastic-molded steel. The first hooking end 31 can be close to the second hooking end 33 following the camshaft 40 to drive the rocker arm body 20 to swing rotationally, at which time the elastic torsion piece 30 enters a compressed state; or the first hooking end 31 can also be restored by its own elastic force away from the second hooking end 33, when the elastic torsion member 30 enters the extended state.
In order to ensure that the first hooking end 31 is firmly installed during the deformation of the torsion spring 30, the roller of the needle bearing is formed with a shaft hole 51, and the first hooking end 31 is inserted into the shaft hole 51. At this time, the first hooking end 31 is restrained by the wall of the shaft hole 51 and is not easily separated from the needle bearing. Certainly, in other embodiments, the hole wall of the shaft hole 51 is further provided with a hook, and the first hook end 31 is hooked with the hook, so that the connection strength and the stability can be further improved; or a magnetic body is arranged in the shaft hole 51, and the first hooking end 31 is inserted into the shaft hole 51 and is fixed with the magnetic body in a magnetic way, so that the first hooking end 31 and the needle bearing can be further firmly assembled.
With reference to fig. 1, the rocker arm structure further includes a fastening member 60, the fastening member 60 is fixedly disposed on the rocker shaft 10, the main body 32 is disposed on the rocker shaft 10, and the second hooking end 33 is connected to the fastening member 60. The main body 32 can thus be securely assembled with the rocker shaft 10, and the second hooking end 33 can be securely mounted to the rocker shaft 10 by the fastener 60.
Optionally, in an embodiment, the rocker arm shaft 10 is provided with a screw hole, and the fastening member 60 is a fastening bolt screwed in the screw hole. Therefore, the fastening bolt is in threaded connection with the screw hole, the connection strength is high, and the assembly and disassembly are convenient.
In other embodiments, the fastening member may also be a pin or other component, and the screw hole is correspondingly a pin hole, and is inserted and fastened in the pin hole by the pin. The rocker arm structure may also be constructed without the fastener 60 by either directly attaching the torsion spring 30 to the rocker shaft 10 or by directly fixedly attaching the second hooking end 33 to the rocker shaft 10.
In one embodiment, the main body 32 has a spiral structure, and the main body 32 is sleeved on the rocker shaft 10 and clamped between the fastener 60 and the rocker body 20. The spiral structure design is adopted, so that the contact area between the main body 32 and the rocker arm shaft 10 is increased under the condition of less manufacturing consumables, and the elastic torsion piece 30 is ensured to be firmly installed. And after the fastening bolt is screwed and fixed, the main body 32 can be clamped and fixed by matching with the side wall of the rocker arm body 20, so that the elastic torsion piece 30 can be further ensured to be stable in stretching deformation.
In particular, in the present embodiment, the second hooking end 33 is a hook structure, a groove 61 is formed on a bolt head of the adaptive fastening bolt, and the second hooking end 33 is fastened and fixed in the groove 61. So second hook end 33 can be connected fixedly with the fastening bolt shackle, makes second hook end 33 be difficult to follow fastening bolt and goes up the atress and drop.
Alternatively, as an alternative embodiment, an insertion hole may be directly formed in the bolt head of the fastening bolt, and the second hooking end 33 may be inserted into the insertion hole in an over-tightening manner, so as to achieve the purpose of fastening and installing the second hooking end 33. Or, the second hooking end 33 is formed with a blocking body, the bolt head of the fastening bolt is formed with a blocking position, and the purpose of ensuring the firm installation of the elastic torsion member 30 is achieved through the blocking body and the blocking position buckle connection.
In summary, for the convenience of understanding the present invention, the elastic torsion member 30 may adopt, but is not limited to, a configuration similar to a torsion spring as long as it can provide an elastic pressure that the rocker arm body 20 presses against the camshaft 40.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A rocker arm structure, comprising:
a rocker shaft;
the rocker arm body is rotatably arranged on the rocker arm shaft;
the elastic torsion piece is arranged on the rocker arm shaft and is connected with the rocker arm body; and
the rocker arm body is connected with the elastic torsion piece, and one end of the rocker arm body connected with the elastic torsion piece is arranged on the cam shaft.
2. The rocker arm structure of claim 1, further comprising a rolling element, wherein an installation notch is formed in one end, close to the camshaft, of the rocker arm body, the rolling element is installed in the installation notch in a rolling manner and is in compression joint with the camshaft, and the elastic torsion element is abutted against the rolling element.
3. The rocker arm structure of claim 2 wherein the rolling elements are needle bearings.
4. The rocker arm structure of claim 3, wherein the roller of the needle bearing is formed with a shaft hole, and the torsion spring includes a first hooking end inserted into the shaft hole.
5. The rocker arm structure of claim 4, further comprising a fastening element, wherein the torsion element further comprises a body connected to the first hooking end and a second hooking end connected to the body, the fastening element is fixedly disposed on the rocker shaft, the body is disposed on the rocker shaft, and the second hooking end is connected to the fastening element.
6. The rocker arm structure of claim 5, wherein the rocker arm shaft is provided with a screw hole, and the fastening member is a fastening bolt screwed in the screw hole.
7. The rocker arm structure of claim 6, wherein the fastening bolt has a bolt head with a groove, and the second hooking end is hooked and fixed in the groove.
8. The rocker arm structure of claim 5, wherein the main body is a spiral structure, and the main body is sleeved on the rocker arm shaft and clamped and fixed between the fastener and the rocker arm body.
9. An engine, characterized by comprising a rocker arm structure as claimed in any one of claims 1 to 8.
10. A motorcycle comprising an engine as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348114.4A CN110985154A (en) | 2019-12-24 | 2019-12-24 | Rocker arm structure, engine and motorcycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348114.4A CN110985154A (en) | 2019-12-24 | 2019-12-24 | Rocker arm structure, engine and motorcycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110985154A true CN110985154A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911348114.4A Pending CN110985154A (en) | 2019-12-24 | 2019-12-24 | Rocker arm structure, engine and motorcycle |
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| Country | Link |
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| CN (1) | CN110985154A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464234A (en) * | 2021-07-14 | 2021-10-01 | 江门市大长江集团有限公司 | Rocker shaft with radial mounting hole, mounting structure, engine and motorcycle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5577469A (en) * | 1994-03-16 | 1996-11-26 | Iav Motor Gmbh | Device for controlling a valve of an internal combustion engine |
| JP2007138766A (en) * | 2005-11-16 | 2007-06-07 | Nissan Diesel Motor Co Ltd | Ohc type valve train of internal combustion engine |
| CN102071982A (en) * | 2011-02-21 | 2011-05-25 | 山东大学 | Mobile rocker arm shaft type variable valve timing mechanism |
| CN105443183A (en) * | 2015-12-04 | 2016-03-30 | 江门市大长江集团有限公司 | Valve rocker assembly of motorcycle engine |
| CN108331629A (en) * | 2018-02-24 | 2018-07-27 | 潍坊学院 | Automobile belt shelves slide enriching device |
| CN211500741U (en) * | 2019-12-24 | 2020-09-15 | 江门市大长江集团有限公司 | Rocker arm structure, engine and motorcycle |
-
2019
- 2019-12-24 CN CN201911348114.4A patent/CN110985154A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5577469A (en) * | 1994-03-16 | 1996-11-26 | Iav Motor Gmbh | Device for controlling a valve of an internal combustion engine |
| JP2007138766A (en) * | 2005-11-16 | 2007-06-07 | Nissan Diesel Motor Co Ltd | Ohc type valve train of internal combustion engine |
| CN102071982A (en) * | 2011-02-21 | 2011-05-25 | 山东大学 | Mobile rocker arm shaft type variable valve timing mechanism |
| CN105443183A (en) * | 2015-12-04 | 2016-03-30 | 江门市大长江集团有限公司 | Valve rocker assembly of motorcycle engine |
| CN108331629A (en) * | 2018-02-24 | 2018-07-27 | 潍坊学院 | Automobile belt shelves slide enriching device |
| CN211500741U (en) * | 2019-12-24 | 2020-09-15 | 江门市大长江集团有限公司 | Rocker arm structure, engine and motorcycle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464234A (en) * | 2021-07-14 | 2021-10-01 | 江门市大长江集团有限公司 | Rocker shaft with radial mounting hole, mounting structure, engine and motorcycle |
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