CN209908586U - Engine valve bridge structure with variable valve lift - Google Patents
Engine valve bridge structure with variable valve lift Download PDFInfo
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- CN209908586U CN209908586U CN201920558842.7U CN201920558842U CN209908586U CN 209908586 U CN209908586 U CN 209908586U CN 201920558842 U CN201920558842 U CN 201920558842U CN 209908586 U CN209908586 U CN 209908586U
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- valve bridge
- rocking arm
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Abstract
The utility model relates to an engine valve bridge structure of variable valve lift includes the rocking arm assembly, the valve bridge, cavity one number that the opening is ascending has been seted up at the middle part of valve bridge, cavity two numbers has been seted up on the inner wall of cavity one number, the inside of cavity two numbers is provided with the execution piston respectively, the pin, the both ends of execution piston respectively with the one end of rocking arm assembly, the bottom fixed connection of cavity one number, the toper annular has been seted up on the outer wall at execution piston middle part, the one end of pin and the inner wall looks butt of cavity two numbers, its other end cooperatees with the inner wall of toper annular, the rocking arm assembly, the inside of execution piston is provided with control oil circuit No. one number respectively, control oil circuit No. two, the one end and the outside oil circuit of control oil circuit are linked together, its other end is linked. The design not only realizes the adjustment of the valve lift of the engine valve bridge, but also has simple structure, low cost and higher universality.
Description
Technical Field
The utility model belongs to the technical field of vehicle engine gas distribution structure, concretely relates to engine valve bridge structure of variable valve lift is applicable to the adjustable of the valve lift that realizes engine valve bridge.
Background
In recent years, various engine valve control technologies have been developed by various domestic and foreign automobile enterprises and component suppliers to improve in-cylinder combustion under different working conditions, so that the engine has good response in both high-speed and low-speed regions, and the fuel economy and the dynamic performance of the engine are improved. The engine valve control technology comprises a variable valve lift technology and an engine braking technology, wherein the variable valve lift technology can change the valve lift when an engine runs, the engine braking technology utilizes compression resistance, internal friction force and air intake and exhaust resistance generated by the compression stroke of the engine to brake a driving wheel, a variable valve lift motion mechanism can generally change the valve lift through a variable cam, a variable rocker ratio and other modes, but the variable cam and the variable rocker ratio can be realized only by changing the position of the cam or the stress position of a rocker, the structure is complex, the cost is high, and the variable valve lift motion mechanism is not widely applied to diesel engines.
Chinese patent: the invention of the grant public number CN103758606A, granted bulletin date 2014, 04, 30 discloses an integrated rocker arm brake device of an engine, wherein one end of a rocker arm hinged on a rocker arm shaft is in contact connection with an exhaust cam through a roller hinged at the end, the other end of the rocker arm is provided with a brake mechanism for controlling the action of an exhaust valve bridge, a control mechanism is arranged on the rocker arm between the brake mechanism and the rocker arm shaft, the exhaust cam drives the rocker arm to rotate and is matched with a hydraulic mechanism controlled by an electromagnetic valve to control the action of the exhaust valve bridge through the control mechanism and the brake mechanism.
Disclosure of Invention
The utility model aims at overcoming the invariable problem of valve lift among the prior art, provide an engine valve bridge structure of variable valve lift.
In order to achieve the above purpose, the utility model provides the following technical scheme:
the valve bridge structure of the engine with the variable valve lift comprises a cam, a rocker arm assembly and a valve bridge assembly, wherein the rocker arm assembly comprises a rocker arm body and a rocker arm shaft, the rocker arm shaft is inserted and matched with a rocker arm hole formed in the middle of the rocker arm body, the rocker arm body can rotate around the rocker arm shaft, one end of the rocker arm body is contacted with the cam, the other end of the rocker arm body is fixedly connected with the middle of the valve bridge assembly, the valve bridge assembly comprises a valve bridge, two sides of the valve bridge are fixedly connected with a first valve and a second valve respectively, a first cavity with an upward opening is formed in the middle of the valve bridge, a second cavity is formed in the inner wall of the first cavity, one end of the second cavity is communicated with the first cavity, and the other end of the second cavity extends to a position close to the;
an execution piston is arranged in the first cavity, the bottom end of the execution piston is abutted to the bottom of the first cavity through a first spring, the top end of the execution piston extends to the outside of the first cavity and then is fixedly connected with the other end of the rocker arm body, and a conical ring groove is formed in the outer wall of the middle of the execution piston;
a pin is arranged in the second cavity, one end of the pin is abutted to the inner wall of the second cavity through a second spring, the other end of the pin is of a conical structure, and the outer wall of the pin is matched with the inner wall of the conical ring groove;
the inside of rocking arm assembly is provided with control oil circuit No. one, the inside of executing the piston is provided with control oil circuit No. two, the one end and the outside oil circuit of control oil circuit No. one are linked together, and the other end and the one end of control oil circuit No. two are linked together, the other end and the toper annular of control oil circuit No. two are linked together.
The bottom of execution piston is provided with the connecting rod, the top of connecting rod and the middle part fixed connection of execution piston bottom, the bottom and the spring of connecting rod insert the cooperation.
The rocker arm assembly further comprises an adjusting nut and a elephant football bowl, one end of the rocker arm body is in contact with the cam through the rocker arm roller, a through hole is formed in the other end of the rocker arm body, one end of the adjusting nut penetrates through the through hole and then is fixedly connected with the rocker arm body through an adjusting bolt, a convex arc surface is arranged at the other end of the adjusting nut and is matched with a concave arc surface arranged on one side of the elephant football bowl, the other side of the elephant football bowl is a plane, and the plane is fixedly connected with the top of the execution piston.
The first control oil way comprises a first oil way positioned in the rocker arm shaft, a second oil way positioned in the rocker arm body, a third oil way positioned in the adjusting nut and a fourth oil way positioned in the elephant football bowl, one end of the first oil way is communicated with an external oil way, and the other end of the first oil way is communicated with one end of the second control oil way after sequentially passing through the second oil way, the third oil way and the fourth oil way.
And an oil drainage hole is formed in the bottom of the first cavity, one end of the oil drainage hole is communicated with the first cavity, and the other end of the oil drainage hole is communicated with the outside of the valve bridge.
And a lubricating oil path is also arranged in the rocker arm shaft.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model relates to an actuating piston, pin are integrated on the valve bridge in the engine valve bridge structure of variable valve lift, the oil circuit is arranged in the rocker arm body and the valve bridge, the relative position of the actuating piston and the valve bridge is controlled by the on-off of the oil circuit, thereby realizing the adjustment of the valve lift, when the oil circuit is in the off state, the relative position of the actuating piston and the valve bridge is not changed, the valve lift is maintained, when the oil circuit is in the on state, the relative position of the actuating piston and the valve bridge is changed, the valve lift is not only applicable to the variable valve displacement structure, the high-power braking structure of the engine or the integrated device of the structure, the valve lift can be used in the air intake and the exhaust, and compared with the traditional mode of regulating the valve lift by the variable cam and the variable rocker arm ratio, the structure of the design is simple, the cost is low, in addition, the valve is suitable for an engine with a four-valve design and is easy to popularize and apply on a large scale. Therefore, the utility model discloses not only realize the adjustable of the valve lift of engine valve bridge, simple structure, with low costs moreover, in addition, have higher commonality.
Drawings
Fig. 1 is a schematic structural view of embodiment 1.
In the figure, a cam 1, a rocker arm assembly 2, a rocker arm body 21, a through hole 211, a rocker arm hole 22, a lubricating oil path 221, an adjusting nut 23, a convex arc surface 231, a elephant foot ball bowl 24, a concave arc surface 241, a plane 242, a rocker arm roller 25, an adjusting bolt 26, a first control oil path 27, a first oil path 271, a second oil path 272, a third oil path 273, a fourth oil path 274, a valve bridge assembly 3, a valve bridge 31, a first cavity 311, an oil drainage hole 3111, a second cavity 312, an actuating piston 32, a conical ring groove 321, a connecting rod 322, a pin 33, a first spring 34, a second spring 35, a second control oil path 36, a rocker arm shaft 4, a first valve 5, a second valve 6 and a valve push rod 7.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Referring to fig. 1, the valve bridge structure of the variable valve lift engine comprises a cam 1, a rocker arm assembly 2 and a valve bridge assembly 3, the rocker arm assembly 2 comprises a rocker arm body 21 and a rocker arm shaft 4, the rocker arm shaft 4 is inserted and matched with a rocker arm hole 22 arranged in the middle of the rocker arm body 21, the rocker arm body 21 can rotate around the rocker arm shaft 4, one end of the rocker arm body 21 is contacted with the cam 1, the other end of the rocker arm body 21 is fixedly connected with the middle part of the valve bridge assembly 3, the valve bridge assembly 3 comprises a valve bridge 31, two sides of the valve bridge 31 are respectively fixedly connected with a first valve 5 and a second valve 6, a first cavity 311 with an upward opening is formed in the middle of the valve bridge 31, a second cavity 312 is formed in the inner wall of the first cavity 311, one end of the second cavity 312 is communicated with the first cavity 311, and the other end of the second cavity 312 extends to a position close to the second valve 6;
an actuating piston 32 is arranged inside the first cavity 311, the bottom end of the actuating piston 32 is abutted against the bottom of the first cavity 311 through a first spring 34, the top end of the actuating piston 32 extends to the outside of the first cavity 311 and then is fixedly connected with the other end of the rocker arm body 21, and a conical ring groove 321 is formed in the outer wall of the middle part of the actuating piston 32;
a pin 33 is arranged in the second cavity 312, one end of the pin 33 is abutted against the inner wall of the second cavity 312 through a second spring 35, the other end of the pin 33 is of a conical structure, and the outer wall of the pin is matched with the inner wall of the conical ring groove 321;
the inside of rocking arm assembly 2 is provided with control oil circuit 27 No. one, the inside of executing piston 32 is provided with control oil circuit 36 No. two, the one end and the outside oil circuit of control oil circuit 27 are linked together, and the other end and the one end of control oil circuit 36 No. two of control oil circuit 27 are linked together, the other end and the toper annular 321 of control oil circuit 36 are linked together.
The bottom end of the execution piston 32 is provided with a connecting rod 322, the top end of the connecting rod 322 is fixedly connected with the middle part of the bottom end of the execution piston 32, and the bottom end of the connecting rod 322 is in insertion fit with the first spring 34.
The rocker arm assembly 2 further comprises an adjusting nut 23 and a football bowl 24, one end of the rocker arm body 21 is in contact with the cam 1 through a rocker arm roller 25, a through hole 211 is formed in the other end of the rocker arm body 21, one end of the adjusting nut 23 penetrates through the through hole 211 and then is fixedly connected with the rocker arm body 21 through an adjusting bolt 26, a convex arc surface 231 is arranged at the other end of the adjusting nut 23, the convex arc surface 231 is matched with a concave arc surface 241 arranged on one side of the football bowl 24, the other side of the football bowl 24 is a plane 242, and the plane 242 is fixedly connected with the top of the execution piston 32.
The first control oil path 27 comprises a first oil path 271 positioned in the rocker arm shaft 4, a second oil path 272 positioned in the rocker arm body 21, a third oil path 273 positioned in the adjusting nut 23 and a fourth oil path 274 positioned in the football bowl 24, one end of the first oil path 271 is communicated with an external oil path, and the other end of the first oil path is communicated with one end of the second control oil path 36 after passing through the second oil path 272, the third oil path 273 and the fourth oil path 274 in sequence.
The bottom of cavity 311 is provided with draining hole 3111, draining hole 3111's one end is linked together with cavity 311, and its other end is linked together with the outside of valve bridge 31.
The rocker arm shaft 4 is also provided with a lubricating oil path 221 inside.
The principle of the utility model is explained as follows:
the utility model discloses a theory of operation does: when the engine is in a normal working state, the first control oil way 27 is controlled to be disconnected from the external oil way, the pin 33 is positioned in the conical ring groove 321, the actuating piston 32 cannot move up and down, at the moment, the rocker arm body 21 drives the valve bridge assembly 3 to move together, the valve lift is kept unchanged, when the engine is in a conversion driving and braking state, the first control oil way 27 is controlled to be connected with the external oil way, engine oil sequentially passes through the first control oil way 27 and the second control oil way 36 from the external oil way and then enters the conical ring groove 321, the pin 33 is pushed to overcome the resistance of the second spring 35 to move towards the direction far away from the actuating piston 32 until the pin 33 exits the conical ring groove 321, then, the rocker arm body 21 drives the actuating piston 32 to move downwards until the bottom of the actuating piston 32 is contacted with the bottom of the first cavity 311, and finally, the rocker arm body 21 drives the valve, since part of the normal valve lift is offset by the distance from the bottom end of the connecting rod 322 to the bottom of the first cavity 311, the part of the valve lift is lost, and the valve lift is changed.
A cold clearance exists between the flat 242 and the top of the actuator piston 32, which can be controlled by adjusting the bolt 26.
Oil drainage hole 3111: the oil leakage in the first cavity 311 is discharged, and the movement of the actuating piston 32 is prevented from being blocked.
The first valve 5 can be one of a driving valve and a braking valve, and the second valve 6 can be one of a driving valve and a braking valve.
Example 1:
referring to fig. 1, an engine valve bridge structure with variable valve lift comprises a cam 1, a rocker arm assembly 2, a valve bridge assembly 3, a first valve 5, a second valve 6 and a valve push rod 7, wherein the rocker arm assembly 2 comprises a rocker arm body 21, an adjusting nut 23, a football bowl 24 and a rocker arm shaft 4, the valve bridge assembly 3 comprises a valve bridge 31, an actuating piston 32 and a pin 33, one side of the valve bridge 31 is fixedly connected with the driving valve 5, the other side of the valve bridge 31 is fixedly connected with a braking valve 6 through the valve push rod 7, the middle of the valve bridge 31 is provided with a first cavity 311 with an upward opening, the inner wall of the first cavity 311 is provided with a second cavity 312, one end of the second cavity 312 is communicated with the first cavity 311, the other end of the second cavity 312 extends to a position close to the second valve 6, the pin 33 is positioned inside the second cavity 312, the inner wall looks butt of No. two spring 35 and No. two cavities 312 is passed through to the one end of pin 33, and the other end of pin 33 is the toper structure, and its outer wall cooperatees with the inner wall of seting up the toper annular 321 on the outer wall in the middle part of executing piston 32, execute piston 32 and be located the inside of a cavity 311, and the bottom of executing piston 32 is provided with connecting rod 322, the middle part fixed connection of the top of connecting rod 322 and the bottom of executing piston 32 bottom, the bottom of connecting rod 322 and a spring 34 insert the cooperation, the one end of a spring 34 contacts with the lower surface of executing piston 32, and the other end of a spring 34 and the bottom looks butt of a cavity 311, the top of executing piston 32 extends to behind the outside of a cavity 311 with set up in like football bowl 24 one side plane 242 fixed connection, like football bowl 24's opposite side is provided with concave cambered surface 241, concave cambered surface 241 cooperatees with the convex cambered surface 231 that is located adjusting nut, the other end of the adjusting nut 23 passes through a through hole 211 formed in one end of the rocker arm body 21 and then is fixedly connected with the rocker arm body 21 through an adjusting bolt 26, a rocker arm hole 22 which is inserted and matched with the rocker arm shaft 4 is formed in the middle of the rocker arm body 21, the rocker arm body 21 can rotate around the rocker arm shaft 4, the other end of the rocker arm body 21 is in contact with the cam 1, a second oil path 272 is formed in the rocker arm body 21, a first oil path 271 and a lubricating oil path 221 are formed in the rocker arm shaft 4, a third oil path 273 is formed in the adjusting nut 23, a fourth oil path 274 is formed in the football bowl 24, a second control oil path 36 is formed in the actuating piston 32, one end of the first oil path 271 is communicated with an external oil path, and the other end of the first oil path 271 is communicated with one end of the second control oil path 36 after passing through the second oil path 272, the third oil path 273 and, the other end of second control oil circuit 36 is linked together with toper annular 321, the bottom of cavity 311 is provided with draining hole 3111, draining hole 3111's one end is linked together with cavity 311, and its other end is linked together with the outside of valve bridge 31.
Claims (6)
1. The utility model provides an engine valve bridge structure of variable valve lift, includes cam (1), rocking arm assembly (2), valve bridge assembly (3), rocking arm assembly (2) are including rocking arm body (21), rocking arm axle (4), rocking arm hole (22) that rocking arm axle (4) and rocking arm body (21) middle part were seted up insert the cooperation, rocking arm body (21) can be rotatory around rocking arm axle (4), and the one end of rocking arm body (21) contacts with cam (1), and the other end of rocking arm body (21) and the middle part fixed connection of valve bridge assembly (3), its characterized in that:
the valve bridge assembly (3) comprises a valve bridge (31), two sides of the valve bridge (31) are fixedly connected with a first valve (5) and a second valve (6) respectively, the middle part of the valve bridge (31) is provided with a first cavity (311) with an upward opening, the inner wall of the first cavity (311) is provided with a second cavity (312), one end of the second cavity (312) is communicated with the first cavity (311), and the other end of the second cavity extends to a position close to the second valve (6);
an actuating piston (32) is arranged inside the first cavity (311), the bottom end of the actuating piston (32) is abutted to the bottom of the first cavity (311) through a first spring (34), the top end of the actuating piston (32) extends to the outside of the first cavity (311) and then is fixedly connected with the other end of the rocker arm body (21), and a conical ring groove (321) is formed in the outer wall of the middle part of the actuating piston (32);
a pin (33) is arranged inside the second cavity (312), one end of the pin (33) is abutted against the inner wall of the second cavity (312) through a second spring (35), the other end of the pin (33) is of a conical structure, and the outer wall of the pin is matched with the inner wall of the conical ring groove (321);
the inside of rocking arm assembly (2) is provided with control oil circuit (27) No. one, the inside of executing piston (32) is provided with control oil circuit (36) No. two, the one end and the outside oil circuit of control oil circuit (27) are linked together, and the other end of control oil circuit (27) is linked together with the one end of control oil circuit (36) No. two, the other end and the toper annular (321) of control oil circuit (36) No. two are linked together.
2. The variable valve lift engine valve bridge structure according to claim 1, wherein: the bottom of carrying out piston (32) is provided with connecting rod (322), the top of connecting rod (322) and the middle part fixed connection of carrying out piston (32) bottom, the bottom and a spring (34) of connecting rod (322) insert the cooperation.
3. The variable valve lift engine valve bridge structure according to claim 1 or 2, wherein: the rocker arm assembly (2) further comprises an adjusting nut (23) and a elephant football bowl (24), one end of the rocker arm body (21) is in contact with the cam (1) through a rocker arm roller (25), a through hole (211) is formed in the other end of the rocker arm body (21), one end of the adjusting nut (23) penetrates through the through hole (211) and then is fixedly connected with the rocker arm body (21) through an adjusting bolt (26), a convex arc surface (231) is arranged at the other end of the adjusting nut (23), the convex arc surface (231) is matched with a concave arc surface (241) arranged on one side of the elephant football bowl (24), the other side of the elephant football bowl (24) is a plane (242), and the plane (242) is fixedly connected with the top of the execution piston (32).
4. The variable valve lift engine valve bridge structure according to claim 3, wherein: the first control oil way (27) comprises a first oil way (271) positioned in the rocker arm shaft (4), a second oil way (272) positioned in the rocker arm body (21), a third oil way (273) positioned in the adjusting nut (23) and a fourth oil way (274) positioned in the elephant foot ball bowl (24), one end of the first oil way (271) is communicated with an external oil way, and the other end of the first oil way is communicated with one end of the second control oil way (36) after sequentially passing through the second oil way (272), the third oil way (273) and the fourth oil way (274).
5. The variable valve lift engine valve bridge structure according to claim 1 or 2, wherein: an oil drainage hole (3111) is formed in the bottom of the first cavity (311), one end of the oil drainage hole (3111) is communicated with the first cavity (311), and the other end of the oil drainage hole is communicated with the outside of the valve bridge (31).
6. The variable valve lift engine valve bridge structure according to claim 1 or 2, wherein: and a lubricating oil path (221) is also arranged in the rocker arm shaft (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920558842.7U CN209908586U (en) | 2019-04-23 | 2019-04-23 | Engine valve bridge structure with variable valve lift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920558842.7U CN209908586U (en) | 2019-04-23 | 2019-04-23 | Engine valve bridge structure with variable valve lift |
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| Publication Number | Publication Date |
|---|---|
| CN209908586U true CN209908586U (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920558842.7U Active CN209908586U (en) | 2019-04-23 | 2019-04-23 | Engine valve bridge structure with variable valve lift |
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| CN (1) | CN209908586U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107373A (en) * | 2019-04-23 | 2019-08-09 | 东风商用车有限公司 | A kind of the engine air raft of pontoons structure and its control method of lift range variable |
| CN113719331A (en) * | 2021-09-24 | 2021-11-30 | 一汽解放汽车有限公司 | Engine valve driving device |
| CN113931712A (en) * | 2021-09-30 | 2022-01-14 | 东风商用车有限公司 | Rocker arm assembly with variable valve lift |
-
2019
- 2019-04-23 CN CN201920558842.7U patent/CN209908586U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107373A (en) * | 2019-04-23 | 2019-08-09 | 东风商用车有限公司 | A kind of the engine air raft of pontoons structure and its control method of lift range variable |
| CN113719331A (en) * | 2021-09-24 | 2021-11-30 | 一汽解放汽车有限公司 | Engine valve driving device |
| CN113931712A (en) * | 2021-09-30 | 2022-01-14 | 东风商用车有限公司 | Rocker arm assembly with variable valve lift |
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