CN106194445B - Exhaust valve self-rotating mechanism for low-speed diesel engine - Google Patents
Exhaust valve self-rotating mechanism for low-speed diesel engine Download PDFInfo
- Publication number
- CN106194445B CN106194445B CN201610674767.1A CN201610674767A CN106194445B CN 106194445 B CN106194445 B CN 106194445B CN 201610674767 A CN201610674767 A CN 201610674767A CN 106194445 B CN106194445 B CN 106194445B
- Authority
- CN
- China
- Prior art keywords
- exhaust valve
- pawl
- helical gear
- valve seat
- mounting groove
- 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.)
- Expired - Fee Related
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 26
- 238000009987 spinning Methods 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
- F02D9/16—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit the members being rotatable
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
the invention discloses an exhaust valve self-rotating mechanism for a low-speed diesel engine, which comprises an exhaust valve shaft, a mounting groove, a helical gear groove and a pawl mechanism, wherein a helical gear groove is formed in a certain section in the middle of the exhaust valve shaft, the pawl mechanism consists of four pawls which are distributed on one circumference at intervals of 90 degrees and springs, and the front end of each pawl is clamped in the helical gear groove. The valve shaft can rotate clockwise in one direction in the movement process of the exhaust valve shaft, and the valve shaft is favorable for preventing the surface of the valve seat from generating deposits and reducing the corrosion of the surface of the valve seat. The invention has the advantages of reasonable design, simple structure, reliable valve rotation and uniform stress, can improve the performance and the service life of the exhaust valve, and is suitable for the optimal design of the self-rotating mechanism of the exhaust valve of the engine.
Description
Technical Field
The invention relates to an exhaust valve in the technical field of internal combustion engines, in particular to an exhaust valve spin mechanism for a low-speed diesel engine, which can control the rotation of the exhaust valve.
Background
In a low-speed diesel engine, in order to reduce eccentric wear and improve the operational reliability of an exhaust valve, an impeller is installed on an exhaust valve rod at the center of an air passage, and when the exhaust valve is opened for exhaust, gas pushes the impeller to rotate the exhaust valve, as shown in fig. 1. The rotation of the exhaust valve enables the temperature in the air valve to be uniformly distributed, reduces the deformation and the thermal stress of the exhaust valve rod, and improves the fatigue life of the exhaust valve. However, the rotation rate of the exhaust valve rotating mechanism cannot be controlled, and under the working conditions of low rotation speed and low load, the low torque formed by pushing the impeller by gas is not enough to overcome the static friction in the exhaust valve rod, the exhaust valve rotates insufficiently, so that carbon and other impurities are easily accumulated on the upper surface of the exhaust valve head, and corrosion and damage of the exhaust valve head and other parts can be caused after a long time. These are all disadvantages of conventional low speed engine exhaust valve spin mechanisms.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a self-rotating mechanism of a low-speed diesel engine exhaust valve, which has a simple structure and reliable rotation.
The invention is realized by the following technical proposal, the invention comprises an exhaust valve rod, an exhaust valve seat, an exhaust valve head, an exhaust passage, a helical gear groove, a pawl, a spring leaf, a rotating shaft, a supporting frame, a mounting groove and a positioning plate, wherein the exhaust valve rod and the exhaust valve head are connected together, the exhaust valve seat and the exhaust passage are both arranged on a cylinder cover, the helical gear groove is arranged on the outer surface of the middle section of the exhaust valve rod, the mounting groove is arranged on the inner wall of the exhaust valve seat, the pawl and the spring leaf together form a pawl mechanism, the pawl mechanism is arranged in the mounting groove, the rotating shaft passes through the pawl, two ends of the rotating shaft are, one end of the spring piece is fixedly connected to the inner wall of the exhaust valve seat in the mounting groove, the other end of the spring piece is arranged on the upper portion of the pawl, the positioning plate is arranged at the lower end of the supporting frame, and one end of the positioning plate is fixedly connected with the inner wall of the exhaust valve seat in the mounting groove.
Further, in the invention, four mounting grooves are uniformly arranged on the exhaust valve seat in an array mode, and the mounting grooves are spaced by 90 degrees.
further, in the present invention, the front end of the pawl has a certain curvature and is engaged with the helical gear groove, the depth of the helical gear groove is adapted to the length of the protrusion of the front end of the pawl, and the portion of the front end of the pawl contacting the helical gear groove is coated with a lubricating oil.
In the implementation of the invention, when the exhaust valve is closed, the exhaust valve rod moves upwards to jack the pawl, and the ascending process of the exhaust valve rod is smooth and does not rotate, as shown in figure 2. When the exhaust valve is opened, the front end of the pawl extends into the helical gear groove to clamp the exhaust valve rod and block the downward movement of the air valve, and at the moment, the exhaust valve rod needs to rotate downwards to enable the front end of the pawl to slide in the helical gear groove, so that the purpose of enabling the air valve to rotate in a single direction is achieved, as shown in fig. 4.
Compared with the prior art, the invention has the following beneficial effects: the invention not only maintains the advantages of the spin function of the exhaust valve of the traditional low-speed diesel engine, but also overcomes the defects of the traditional low-speed diesel engine. The spin rate of the air valve is in direct proportion to the rotating speed of the engine, the air valve can be ensured to reliably rotate under any working condition, the influences of carbon deposition, eccentric wear and the like can be obviously reduced, and the service life of the exhaust valve is prolonged.
Drawings
FIG. 1 is a schematic view of a conventional exhaust valve impeller type spinning structure of a low speed machine;
FIG. 2 is a schematic view of the self-spinning mechanism of the exhaust valve of the low speed engine of the present invention when the exhaust valve is closed;
FIG. 3 is a schematic illustration of the detent position of the self-rotating mechanism for the exhaust valve of the low speed machine of the present invention when the exhaust valve is closed;
FIG. 4 is a schematic view of the self-spinning mechanism of the exhaust valve of the low speed engine of the present invention when the exhaust valve is open;
FIG. 5 is a schematic illustration of the detent position of the self-spinning mechanism of the low speed engine exhaust valve of the present invention when the exhaust valve is open;
FIG. 6 is a top view of the spin mechanism of the low speed engine exhaust valve of the present invention;
Wherein: 1. the exhaust valve comprises an exhaust valve rod, 2, an exhaust valve seat, 3, an impeller, 4, an exhaust valve head, 5, an exhaust passage, 6, a helical gear groove, 7, a pawl, 8, a spring piece, 9, a rotating shaft, 10, a supporting frame, 11 mounting grooves, 12 and a positioning plate.
Detailed Description
The following embodiments of the present invention are described in detail with reference to the accompanying drawings, and the embodiments and specific operations of the embodiments are provided on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
examples
As shown in fig. 1 to 6, the exhaust valve comprises an exhaust valve rod 1, an exhaust valve seat 2, an exhaust valve head 4, an exhaust passage 5, a helical gear groove 6, a pawl 7, a spring piece 8, a rotating shaft 9, a support frame 10, a mounting groove 11 and a positioning plate 12, wherein the exhaust valve rod 1 and the exhaust valve head 4 are connected together, the exhaust valve seat 2 and the exhaust passage 5 are both arranged on a cylinder cover, the helical gear groove 6 is arranged on the outer surface of the middle section of the exhaust valve rod 1, the mounting groove 11 is arranged on the inner wall of the exhaust valve seat 2, the pawl 7 and the spring piece 8 together form a pawl mechanism, the pawl mechanism is arranged in the mounting groove 11, the rotating shaft 9 passes through the pawl 7, two ends of the rotating shaft 9 are fixed in, one end of the spring piece 8 is fixedly connected on the inner wall of the exhaust valve seat 2 in the mounting groove 11, and the other end is arranged at the upper part of the pawl 7; the four mounting grooves 11 are uniformly arranged on the exhaust valve seat 2 in an array mode, and the mounting grooves 11 are spaced by 90 degrees; the front end of the pawl 7 has a certain radian and can be meshed with the helical gear groove 6, the depth of the helical gear groove 6 is adapted to the extending length of the front end of the pawl 7, the part of the front end of the pawl 7, which is contacted with the helical gear groove 6, is coated with lubricating oil, the positioning plate 12 is arranged at the lower end of the supporting frame 10, and one end of the positioning plate 12 is fixedly connected with the inner wall of the exhaust valve seat 2 in the mounting groove 11.
As shown in fig. 2, the exhaust valve is in a closed state, and during the ascending process of the exhaust valve rod 1, because the length of the pawl 7 is relatively long, the pawl 7 is pushed open by the exhaust valve rod 1, and under the action of the spring piece 8, the front end of the pawl is pushed against the outer wall of the exhaust valve rod 8 or extends into the helical gear groove 6 and presses the lower edge of the groove, as shown in fig. 3. The spring piece 8 is in a compression state in the whole process, and all parts are compact, smooth and reliable. After the work is finished, the pawl 7 is in an upward tilting state to prepare for the next stage.
As shown in fig. 4, when the exhaust valve is in an open state, during the descending process of the exhaust valve rod 1, the state of the pawl 7 is quickly changed from pressing the lower edge of the groove to abutting against the upper edge of the groove, which directly causes the exhaust valve rod 1 to be clamped, so that the downward movement process is blocked, and therefore, the valve rod must rotate to enable the front end of the pawl 7 to slide in the helical gear groove 6, as shown in fig. 5. In this way, the lowering process of the exhaust valve stem 1 is always accompanied by self-rotation, and the design purpose is achieved.
as shown in fig. 6, there are 4 detent mechanisms around the whole exhaust valve stem 1, which are spaced 90 degrees apart from each other, and they function the same, and work simultaneously, are symmetrically distributed, increasing the smooth reliability of the exhaust valve operation.
When the engine is in different working conditions, the opening and closing frequency and the opening and closing speed of the exhaust valve of the engine can be changed along with the engine. Thus, the spin speed of the exhaust valve stem 1 is also changed, and the purpose of controlling the spin speed is achieved.
By the positioning plate 12, the pawls 7 can be prevented from being excessively rotated.
In conclusion, the spin mechanism of the exhaust valve of the low-speed engine can change the spin speed of the exhaust valve along with the difference of the rotating speed of the engine, achieve the purpose of reliable adjustment along with the working condition, effectively prevent the deposition of fuel droplets and combustion products on the surface of the valve seat, reduce the abrasion of the surface of the valve seat and prolong the service life of the exhaust valve. In conclusion, the exhaust valve has reasonable design and simple structure, can ensure that the exhaust valve reliably rotates, improves the all-condition performance of the exhaust valve, and is suitable for the exhaust valve of a low-speed high-power diesel engine.
Claims (3)
1. The utility model provides a discharge valve spin mechanism for low-speed diesel engine, including exhaust valve rod (1), exhaust valve seat (2), exhaust valve head (4), exhaust passage (5), exhaust valve rod (1), exhaust valve head (4) link together, exhaust valve seat (2), exhaust passage (5) equipartition is arranged on the cylinder head, a serial communication port, still include helical gear slot (6), pawl (7), spring leaf (8), pivot (9), support frame (10), mounting groove (11), locating plate (12), helical gear slot (6) are arranged in one section surface in the middle of exhaust valve rod (1), mounting groove (11) are arranged on the inner wall of exhaust valve seat (2), pawl (7), spring leaf (8) are constituteed pawl mechanism together, pawl mechanism arranges in mounting groove (11), pawl (7) are passed in pivot (9), the both ends of pivot (9) are fixed in the inner wall of exhaust valve seat (2) in mounting groove (11) through support frame (10), pawl (7) are passed through to the both One end of the spring piece (8) is fixedly connected to the inner wall of the exhaust valve seat (2) in the mounting groove (11), the other end of the spring piece is arranged on the upper portion of the pawl (7), the positioning plate (12) is arranged below the supporting frame (10) and the pawl (7) to play a limiting role and prevent the pawl (7) from excessively rotating, and one end of the positioning plate (12) is fixedly connected with the inner wall of the exhaust valve seat (2) in the mounting groove (11).
2. The exhaust valve spin mechanism for a low speed diesel engine according to claim 1, wherein four mounting grooves (11) are uniformly arrayed on the exhaust valve seat (2), and the mounting grooves (11) are spaced 90 degrees apart.
3. the exhaust valve spinning mechanism for a low speed diesel engine according to claim 2, wherein the front end of the pawl (7) has a certain curvature and is engaged with the helical gear groove (6), the depth of the helical gear groove (6) is adapted to the protruding length of the front end of the pawl (7), and the portion of the front end of the pawl (7) contacting with the helical gear groove (6) is coated with the lubricating oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610674767.1A CN106194445B (en) | 2016-08-16 | 2016-08-16 | Exhaust valve self-rotating mechanism for low-speed diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610674767.1A CN106194445B (en) | 2016-08-16 | 2016-08-16 | Exhaust valve self-rotating mechanism for low-speed diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106194445A CN106194445A (en) | 2016-12-07 |
| CN106194445B true CN106194445B (en) | 2019-12-13 |
Family
ID=57522251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610674767.1A Expired - Fee Related CN106194445B (en) | 2016-08-16 | 2016-08-16 | Exhaust valve self-rotating mechanism for low-speed diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106194445B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0675265A1 (en) * | 1993-09-20 | 1995-10-04 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Valve driving system for internal combustion engine |
| KR100220466B1 (en) * | 1996-12-06 | 1999-09-15 | 정몽규 | Cam structure for protecting of eccentric abrasion |
| CN1332313A (en) * | 2000-07-10 | 2002-01-23 | 曼B与W狄赛尔公司 | Method for driving exhaust valve in internal combustion engine and exhaust valve thereof |
| CN1566621A (en) * | 2003-06-18 | 2005-01-19 | 王平 | Disc shaped variable vortex throttle piston for automobile engine, internal combustion engine |
| WO2011077686A1 (en) * | 2009-12-21 | 2011-06-30 | 川崎重工業株式会社 | Four-stroke internal combustion engine and exhaust valve |
| CN102808670A (en) * | 2012-08-30 | 2012-12-05 | 上海交通大学 | Air intake/exhaust valve lift-variable system in air intake pressure regulating type |
| CN103590904A (en) * | 2013-11-09 | 2014-02-19 | 中国第一汽车股份有限公司 | Device for measuring rotating speed of air valve |
-
2016
- 2016-08-16 CN CN201610674767.1A patent/CN106194445B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0675265A1 (en) * | 1993-09-20 | 1995-10-04 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Valve driving system for internal combustion engine |
| KR100220466B1 (en) * | 1996-12-06 | 1999-09-15 | 정몽규 | Cam structure for protecting of eccentric abrasion |
| CN1332313A (en) * | 2000-07-10 | 2002-01-23 | 曼B与W狄赛尔公司 | Method for driving exhaust valve in internal combustion engine and exhaust valve thereof |
| CN1566621A (en) * | 2003-06-18 | 2005-01-19 | 王平 | Disc shaped variable vortex throttle piston for automobile engine, internal combustion engine |
| WO2011077686A1 (en) * | 2009-12-21 | 2011-06-30 | 川崎重工業株式会社 | Four-stroke internal combustion engine and exhaust valve |
| CN102808670A (en) * | 2012-08-30 | 2012-12-05 | 上海交通大学 | Air intake/exhaust valve lift-variable system in air intake pressure regulating type |
| CN103590904A (en) * | 2013-11-09 | 2014-02-19 | 中国第一汽车股份有限公司 | Device for measuring rotating speed of air valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106194445A (en) | 2016-12-07 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 |