CN210105939U - Exhaust valve device for two-stroke engine - Google Patents
Exhaust valve device for two-stroke engine Download PDFInfo
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- CN210105939U CN210105939U CN201921048447.0U CN201921048447U CN210105939U CN 210105939 U CN210105939 U CN 210105939U CN 201921048447 U CN201921048447 U CN 201921048447U CN 210105939 U CN210105939 U CN 210105939U
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- exhaust valve
- exhaust
- push rod
- valve shaft
- stroke engine
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Abstract
The utility model discloses an exhaust valve device for a two-stroke engine, which relates to the technical field of engines and comprises a cylinder cover, an exhaust passage, a third mounting groove and an exhaust valve shaft; the exhaust passage is arranged on the cylinder cover, and the inlet end of the exhaust passage is vertical; the cylinder cover is also provided with a third mounting groove which is positioned above the inlet end of the exhaust passage; the exhaust valve shaft is arranged in the third mounting groove in a sliding mode, the lower end of the exhaust valve shaft vertically penetrates through the inlet end of the exhaust passage and extends vertically downwards, and an exhaust seal head is further arranged at the lower end of the exhaust valve shaft; and an exhaust valve elastic piece for pushing an exhaust valve shaft is arranged in the third mounting groove. The utility model discloses not only make the switching control of exhaust valve more convenient, and reduced cam mechanism, make two-stroke engine's structure simplier.
Description
Technical Field
The utility model relates to an engine technical field particularly, relates to an exhaust valve device for two-stroke engine.
Background
The conventional automobile engine is mainly a four-stroke engine at present, and the engine for motorcycles and many small machines is a two-stroke engine. Although the existing two-stroke engine has small volume and fast work, the work efficiency is low, therefore, in order to improve the work efficiency of the two-stroke engine on the original basis, the two-stroke engine which can simultaneously complete two steps of work and air suction appears on the market.
Disclosure of Invention
An object of the utility model is to provide an exhaust valve device for two-stroke engine can switch by oneself according to the shift position and the engine operating condition of cylinder piston not only make the switching of exhaust valve, and has saved cam mechanism, makes two-stroke engine's structure simplifier more.
For realizing the purpose of the utility model, the technical proposal adopted is that: an exhaust valve device for a two-stroke engine comprises a cylinder cover, an exhaust passage, a third mounting groove and an exhaust valve shaft;
the exhaust passage is arranged on the cylinder cover, and the inlet end of the exhaust passage is vertical;
the cylinder cover is also provided with a third mounting groove which is positioned above the inlet end of the exhaust passage;
the exhaust valve shaft is arranged in the third mounting groove in a sliding mode, the lower end of the exhaust valve shaft vertically penetrates through the inlet end of the exhaust passage and extends vertically downwards, and an exhaust seal head is further arranged at the lower end of the exhaust valve shaft;
and an exhaust valve elastic piece for pushing an exhaust valve shaft is arranged in the third mounting groove.
Further, a push rod sliding hole is formed in the exhaust valve shaft, and a push rod is inserted into the push rod sliding hole; and a push rod elastic piece for pushing the push rod is also arranged in the exhaust valve shaft.
Furthermore, the exhaust valve elastic part is sleeved at the upper end of the exhaust valve shaft, an exhaust blocking sleeve is fixedly mounted at the upper end of the exhaust valve shaft, and the lower end of the exhaust valve elastic part is abutted to the exhaust blocking sleeve.
Furthermore, the exhaust baffle sleeve is in clearance fit with the third mounting groove.
Further, a pin shaft extending along the radial direction is further installed in the push rod sliding hole, a pin shaft hole matched with the pin shaft is further formed in the push rod, and the pin shaft hole is a long waist hole.
Furthermore, two ends of the pin shaft penetrate through the exhaust valve shaft and are fixed with the exhaust blocking sleeve.
Furthermore, the push rod is in clearance fit with the push rod sliding hole.
Furthermore, the exhaust valve elastic piece and the push rod elastic piece are compression springs.
Furthermore, the exhaust seal head is conical, and the inlet end of the exhaust passage is horn-shaped and matched with the exhaust seal head.
Further, the upper end of cylinder cap still fixed mounting has the top cap, and the third mounting groove is seted up on the lower surface of top cap.
The utility model has the advantages that,
when the piston in the working chamber and the piston in the compression chamber are positioned at the highest position, the pressure in the working chamber is higher, the pressure in the working chamber can push the exhaust seal head to move upwards, and at the moment, when the exhaust seal head moves upwards, the exhaust seal head drives the exhaust valve to move upwards axially, so that the exhaust valve elastic part is completely compressed; meanwhile, a piston in the working chamber applies a pressure to the push rod, the push rod pushes the push rod elastic piece to be compressed, the thrust borne by the push rod is transmitted to the exhaust valve shaft, the exhaust seal head on the exhaust valve shaft is abutted against the outlet end of the exhaust passage, and the exhaust passage is completely sealed.
When the working chamber starts to work, the pressure in the working chamber is suddenly increased, so that the piston in the working chamber is pushed to move downwards, at the moment, the piston in the working chamber loses the pushing force of the push rod, the push rod elastic piece pushes the push rod to reset through the elastic force of the push rod elastic piece, and at the moment, the pressure in the working chamber is still larger, so that the exhaust seal head is still pushed to be tightly abutted against the inlet end of the exhaust passage, the exhaust valve elastic piece is still in a compressed state, and the exhaust passage is still completely blocked.
When the piston in the working chamber is at the lowest position, the pressure in the working chamber is relieved through the pressure relief hole, at the moment, the pressure in the working chamber is smaller, the valve seal head loses upward thrust, namely the exhaust valve shaft loses upward thrust, at the moment, the exhaust valve elastic piece pushes the exhaust valve to move downwards through the elasticity of the exhaust valve elastic piece, the exhaust seal head on the exhaust valve shaft synchronously moves downwards along with the exhaust valve shaft, the exhaust seal head loses the support on the inlet end of the exhaust passage, and the exhaust passage is automatically opened.
The utility model discloses not only make the switching control of exhaust valve more convenient, and reduced cam mechanism, make two-stroke engine's structure simplier.
Drawings
Fig. 1 is a structural view of an exhaust valve device for a two-stroke engine according to the present invention;
FIG. 2 is a block diagram of the exhaust valve shaft of FIG. 1;
fig. 3 is a structural view of the push rod of fig. 1.
Reference numbers and corresponding part names in the drawings:
50. the exhaust baffle sleeve comprises a 51 exhaust valve shaft, a 52 exhaust end enclosure, a 53 exhaust valve elastic part, a 54 push rod sliding hole, a 55 push rod, a 56 push rod elastic part, a 57 push rod sliding hole, a 58 pin shaft hole, a 59 cylinder cover, a 60 exhaust channel, a 61 third mounting groove, a 62 top cover.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Fig. 1, fig. 2 and fig. 3 show an exhaust valve device for a two-stroke engine according to the present invention, which includes a cylinder cover 59, an exhaust passage 60, a third mounting groove 61, and an exhaust valve shaft 51;
the exhaust passage 60 is arranged on the cylinder cover 59, and the inlet end of the exhaust passage 60 is vertical;
a third mounting groove 61 is further formed in the cylinder cover 59, and the third mounting groove 61 is located above the inlet end of the exhaust passage 60;
the exhaust valve shaft 51 is slidably mounted in the third mounting groove 61, the lower end of the exhaust valve shaft 51 vertically penetrates through the inlet end of the exhaust passage 60 and vertically extends downwards, and the lower end of the exhaust valve shaft 51 is also provided with an exhaust seal head 52;
an exhaust valve elastic member 53 for pushing the exhaust valve shaft 51 is installed in the third installation groove 61.
The cylinder cover 59 is covered on the engine cylinder body, and the exhaust passage 60 is used for being communicated with a working chamber of the engine; the exhaust passage 60 is in a 'L' shape, the inlet end of the exhaust passage 60 is positioned on the lower surface of the cylinder cover 59, and the outlet end of the exhaust passage 60 is horizontally arranged; the third mounting groove 61 is not communicated with the exhaust passage 60, the third mounting groove 61 is cylindrical or prismatic, the third mounting groove 61 is positioned right above the inlet end of the exhaust passage 60, namely the central axis of the inlet end of the exhaust passage 60 and the central axis of the third mounting groove 61 are positioned on the same vertical line, so that the exhaust valve shaft 51 can be prevented from falling off, the exhaust valve shaft 51 can be limited in the up-and-down moving process, and the exhaust valve shaft 51 can be prevented from inclining in the up-and-down moving process.
The central axis of the exhaust valve shaft 51 and the central axis of the third mounting groove 61 are on the same straight line, and the lower end of the exhaust valve shaft 51 vertically extends downwards along the inlet end of the exhaust passage 60, namely the lower end of the exhaust valve shaft 51 is lower than the inlet end of the exhaust passage 60; the exhaust seal head 52 is positioned below the inlet end of the exhaust passage 60, and the exhaust seal head 52 are integrally arranged, so that the exhaust valve shaft 51 and the exhaust seal head 52 are connected more firmly, and the exhaust seal head 52 is prevented from falling off from the exhaust valve shaft 51. The exhaust valve elastic part 53 is an elastic part with elasticity, so that after the exhaust valve shaft 51 receives upward thrust, the exhaust valve elastic part 53 can be compressed by the pushing of the exhaust valve shaft 51, and after the exhaust valve shaft 51 loses the upward thrust, the exhaust valve elastic part 53 can push the exhaust valve shaft 51 to move downwards by the elasticity of the exhaust valve elastic part 53, so that the exhaust seal head 52 on the exhaust valve shaft 51 can automatically open or close the exhaust passage 60.
When the piston in the working chamber moves upwards, the pressure in the working chamber is increased, the pressure in the working chamber pushes the exhaust seal head 52 to move upwards, the exhaust seal head 52 transmits the pressure to the exhaust valve shaft 51, the exhaust valve shaft 51 transmits the pressure to the exhaust valve spring, and the exhaust valve spring is compressed, so that the exhaust seal head 52 is abutted against the inlet end of the exhaust passage 60, and the exhaust passage 60 is closed; when the piston in the working chamber moves downwards, the pressure in the working chamber is relieved through the relief hole, the pressure in the working chamber is reduced, the exhaust seal head 52 loses upward thrust, the exhaust valve spring pushes the exhaust valve shaft 51 to move downwards through the elastic force of the exhaust valve spring, the exhaust seal head 52 fixed with the exhaust valve shaft 51 moves downwards synchronously along with the exhaust valve shaft 51, the exhaust seal head 52 loses the abutting effect on the inlet end of the exhaust passage 60, and therefore the exhaust passage 60 is opened automatically.
A push rod sliding hole 54 is further formed in the exhaust valve shaft 51, and a push rod 55 is inserted into the push rod sliding hole 54; a push rod elastic piece 56 for pushing the push rod 55 is further arranged in the exhaust valve shaft 51; the push rod sliding hole 54 is formed in the lower end face of the exhaust valve shaft 51, the lower end of the push rod sliding hole 54 penetrates through the exhaust seal head 52 and faces downwards vertically, and the central axis of the push rod sliding hole 54 and the central axis of the exhaust valve shaft 51 are on the same straight line; the push rod elastic piece 56 is installed at the bottom of the push rod sliding hole 54, the lower end of the push rod elastic piece 56 is matched with the upper end of the push rod 55, the push rod 55 is enabled to extend into the working chamber under the condition that the push rod 55 is not under pressure through the thrust of the push rod elastic piece 56, when the push rod 55 is under upward pressure, a spring of the push rod 55 is completely compressed, the thrust of the push rod 55 is transmitted to the exhaust valve shaft 51, the exhaust valve shaft 51 is enabled to be abutted tightly, the valve seal head is enabled to be abutted tightly with the inlet end of the exhaust passage 60, looseness of the valve seal head and the inlet end of the exhaust passage 60 is prevented, the sealing effect of the exhaust passage 60 is enabled to be better, and the exhaust passage 60. The push rod 55 can move up and down in the push rod sliding hole 54, but the push rod 55 cannot fall off from the push rod sliding hole 54, so that the push rod 55 is effectively prevented from falling into the working chamber.
The exhaust valve elastic piece 53 is sleeved at the upper end of the exhaust valve shaft 51, the exhaust blocking sleeve 50 is fixedly mounted at the upper end of the exhaust valve shaft 51, and the lower end of the exhaust valve elastic piece 53 abuts against the exhaust blocking sleeve 50. The exhaust valve blocking sleeve is positioned in the third mounting groove 61, the shape of the exhaust valve blocking sleeve is matched with that of the third mounting groove 61, namely the exhaust valve blocking sleeve is disc-shaped or prism-shaped, so that the exhaust valve blocking sleeve can slide up and down in the third mounting groove 61, when the exhaust valve blocking sleeve is prism-shaped, the exhaust valve blocking sleeve can only move up and down in the third mounting groove 61, the exhaust valve blocking sleeve cannot rotate in the third mounting groove 61, the exhaust valve shaft 51 can only move up and down and cannot rotate, the exhaust valve shaft 51 is more stable in the up and down moving process, and finally the plugging effect of the valve sealing head on the outlet end of the exhaust passage 60 is better; the upper end of the exhaust valve elastic piece 53 abuts against the bottom of the mounting groove, the lower end of the exhaust valve elastic piece 53 is sleeved at the upper end of the exhaust valve shaft 51, and the lower end of the exhaust valve elastic piece 53 abuts against the exhaust blocking sleeve 50, so that the exhaust valve elastic piece 53 is mounted, the lower end of the exhaust valve elastic piece 53 can be effectively limited, the exhaust valve elastic piece 53 is prevented from inclining in the process of being said, and the exhaust valve elastic piece 53 is enabled to deform under long-term use.
A pin shaft 57 extending along the radial direction is further installed in the push rod sliding hole 54, a pin shaft hole 58 matched with the pin shaft 57 is further formed in the push rod 55, and the pin shaft hole 58 is a long waist hole. The central axis of the pin shaft 57 extends along the diameter direction of the exhaust valve shaft 51, and two ends of the pin shaft 57 can be forcibly fixed or fixed by welding; the pin shaft hole 58 is a through hole, the pin shaft hole 58 is positioned on the outer circular surface of the push rod 55, and the length direction of the pin shaft hole 58 is consistent with the radius direction of the pin shaft 57; the length of the pin shaft hole 58 is greater than the diameter of the pin shaft 57, so that after the push rod 55 is pressed upwards, the push rod 55 can move upwards for a certain distance under the guidance of the pin shaft 57, and when the push rod 55 cannot move upwards continuously under the blockage of the pin shaft 57, the force of the push rod 55 is transmitted to the exhaust valve shaft 51, so that the valve sealing head abuts against the inlet end of the exhaust passage 60, and the sealing effect of the valve sealing head on the exhaust passage 60 is better; the pin shaft 57 can effectively limit the push rod 55, so that the push rod 55 can be prevented from falling off from the push rod slide hole 54, and the push rod 55 can push the valve to be axially and tightly abutted.
In order to prevent the push rod 55 from falling off from the push rod sliding hole 54, a plurality of guide pins extending along the radial direction of the push rod 55 can be directly and fixedly arranged on the outer wall of the push rod 55, then a plurality of guide through grooves corresponding to the guide pins one to one are formed in the exhaust valve shaft 51, then the lower end of the push rod elastic part 56 is abutted against the upper surface of the push rod 55, and the lower end of the push rod elastic part 56 is abutted against the bottom of the push rod sliding hole 54; in order to prevent the push rod 55 from falling out of the push rod slide hole 54, the lower end of the push rod elastic member 56 may be welded and fixed to the upper surface of the push rod 55, and the lower end of the push rod elastic member 56 may be welded and fixed to the bottom of the push rod slide hole 54.
And two ends of the pin shaft 57 penetrate through the exhaust valve shaft 51 and are fixed with the exhaust baffle sleeve 50. Two ends of the pin shaft 57 respectively penetrate through the exhaust valve shaft 51 and extend to the radial direction of the exhaust valve shaft 51, so that the two ends of the pin shaft 57 are inserted into the exhaust baffle sleeve 50, the installation of the pin shaft 57 is realized, and the exhaust baffle sleeve 50 is fixedly connected with the exhaust valve shaft 51; when the two ends of the pin 57 do not penetrate through the exhaust valve shaft 51, the exhaust baffle sleeve 50 and the exhaust valve shaft 51 are fixed by screws or welding.
The exhaust blocking sleeve 50 is in clearance fit with the third mounting groove 61, so that the exhaust blocking sleeve 50 moves up and down in the third mounting groove 61 more smoothly, and the exhaust valve shaft 51 moves more smoothly. The push rod 55 is in clearance fit with the push rod sliding hole 54, so that the push rod 55 can move up and down in the push rod sliding hole 54 more smoothly. The exhaust valve elastic member 53 and the push rod elastic member 56 are both compression springs, and the exhaust valve elastic member 53 and the push rod elastic member 56 may also be other elastic elements such as disc springs.
The exhaust seal head 52 is conical, and the inlet end of the exhaust passage 60 is horn-shaped and matched with the exhaust seal head 52. Specifically, the inner wall of the inlet end of the exhaust duct 60 is in a horn shape, the maximum diameter of the exhaust seal head 52 is matched with the maximum diameter of the inlet end of the exhaust duct 60, so that when the inlet end of the exhaust duct 60 is plugged, the lower surface of the exhaust seal head 52 is flush with the lower surface of the cylinder cover 59, the lower surface of the cylinder cover 59 is more flat, and the plugging effect of the exhaust seal head 52 on the exhaust duct 60 is better.
The upper end of cylinder cap 59 still fixed mounting have a top cap 62, and third mounting groove 61 is seted up on the lower surface of top cap 62, and top cap 62 can increase the thickness of cylinder cap 59, and can make things convenient for exhaust valve elastic component 53, exhaust valve axle 51's installation and dismantlement.
When the piston in the working chamber and the piston in the compression chamber are positioned at the highest position, the pressure in the working chamber is higher, the pressure in the working chamber can push the exhaust seal head 52 to move upwards, and at the moment, when the exhaust seal head 52 moves upwards, the exhaust seal head 52 drives the exhaust valve shaft 51 to move upwards, so that the exhaust valve elastic part 53 is completely compressed; meanwhile, as the piston in the working chamber applies a pressure to the push rod 55, the push rod 55 pushes the push rod elastic piece 56 to be pressed, so that the thrust borne by the push rod 55 is transmitted to the exhaust valve shaft 51, the exhaust seal head 52 on the exhaust valve shaft 51 is tightly abutted to the outlet end of the exhaust passage 60, and the exhaust passage 60 is completely sealed.
When the working chamber starts to work, the pressure in the working chamber increases suddenly, so that the piston in the working chamber is pushed to move downwards, at the moment, although the piston in the working chamber loses the pushing force of the push rod 55, the push rod elastic piece 56 pushes the push rod 55 to reset through the self elastic force, and because the pressure in the working chamber is still larger at the moment, the pressure in the working chamber still pushes the exhaust seal head 52 to be tightly abutted against the inlet end of the exhaust passage 60, so that the exhaust valve elastic piece 53 is still in a compressed state, and the exhaust passage 60 is still completely blocked.
When the piston in the working chamber is at the lowest position, the pressure in the working chamber is relieved through the pressure relief hole, at the moment, the pressure in the working chamber is smaller, the valve seal head loses upward thrust, namely the exhaust valve shaft 51 loses upward thrust, at the moment, the exhaust valve elastic piece 53 pushes the exhaust valve shaft 51 to move downwards through the self elastic force, the exhaust seal head 52 on the exhaust valve shaft 51 synchronously moves downwards along with the exhaust valve shaft 51, the exhaust seal head 52 loses the support on the inlet end of the exhaust passage 60, and the exhaust passage 60 is automatically opened.
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. An exhaust valve device for a two-stroke engine is characterized by comprising a cylinder cover, an exhaust passage, a third mounting groove and an exhaust valve shaft;
the exhaust passage is arranged on the cylinder cover, and the inlet end of the exhaust passage is vertical;
the cylinder cover is also provided with a third mounting groove which is positioned above the inlet end of the exhaust passage;
the exhaust valve shaft is arranged in the third mounting groove in a sliding mode, the lower end of the exhaust valve shaft vertically penetrates through the inlet end of the exhaust passage and extends vertically downwards, and an exhaust seal head is further arranged at the lower end of the exhaust valve shaft;
and an exhaust valve elastic piece for pushing an exhaust valve shaft is arranged in the third mounting groove.
2. The exhaust valve device for the two-stroke engine according to claim 1, wherein a push rod sliding hole is further formed in the exhaust valve shaft, and a push rod is inserted into the push rod sliding hole; and a push rod elastic piece for pushing the push rod is also arranged in the exhaust valve shaft.
3. The exhaust valve device for the two-stroke engine as recited in claim 2, wherein said exhaust valve elastic member is fitted over an upper end of the exhaust valve shaft, an exhaust stopper sleeve is further fixedly mounted on the upper end of the exhaust valve shaft, and a lower end of the exhaust valve elastic member abuts against the exhaust stopper sleeve.
4. The exhaust valve apparatus for a two-stroke engine according to claim 3, wherein the exhaust baffle bushing is clearance fitted with the third mounting groove.
5. The exhaust valve device for the two-stroke engine according to claim 2 or 3, wherein a pin shaft extending in the radial direction is further installed in the push rod sliding hole, a pin shaft hole matched with the pin shaft is further formed in the push rod, and the pin shaft hole is a long waist hole.
6. The exhaust valve device for the two-stroke engine according to claim 5, wherein both ends of the pin shaft penetrate through the exhaust valve shaft and are fixed to the exhaust retainer.
7. The exhaust valve apparatus for a two-stroke engine according to claim 5, wherein the push rod is clearance fitted with the push rod sliding hole.
8. The exhaust valve apparatus for a two-stroke engine as claimed in claim 5, wherein said exhaust valve elastic member and said pushrod elastic member are compression springs.
9. The exhaust valve device for the two-stroke engine as recited in claim 1, wherein the exhaust head is conical, and the inlet end of the exhaust passage is flared to fit the exhaust head.
10. The exhaust valve device for the two-stroke engine as recited in claim 1, wherein a head cover is further fixedly mounted at an upper end of the cylinder head, and a third mounting groove is opened on a lower surface of the head cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921048447.0U CN210105939U (en) | 2019-07-05 | 2019-07-05 | Exhaust valve device for two-stroke engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921048447.0U CN210105939U (en) | 2019-07-05 | 2019-07-05 | Exhaust valve device for two-stroke engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210105939U true CN210105939U (en) | 2020-02-21 |
Family
ID=69566531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921048447.0U Active CN210105939U (en) | 2019-07-05 | 2019-07-05 | Exhaust valve device for two-stroke engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210105939U (en) |
-
2019
- 2019-07-05 CN CN201921048447.0U patent/CN210105939U/en active Active
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