CN108691597B - Variable valve lift adjusting mechanism of automobile engine - Google Patents
Variable valve lift adjusting mechanism of automobile engine Download PDFInfo
- Publication number
- CN108691597B CN108691597B CN201810720689.3A CN201810720689A CN108691597B CN 108691597 B CN108691597 B CN 108691597B CN 201810720689 A CN201810720689 A CN 201810720689A CN 108691597 B CN108691597 B CN 108691597B
- Authority
- CN
- China
- Prior art keywords
- oil
- plunger
- cam
- spring
- valve
- 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.)
- Active
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 12
- 239000003921 oil Substances 0.000 claims abstract description 170
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 79
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 description 3
- 230000036316 preload Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
-
- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a variable valve lift adjusting mechanism of an automobile engine, which is used for realizing flexible adjustment and control of valve lift parameters and comprises the following components: cam a, plunger a, oil pressure regulating valve, spring a, etc. When the hydraulic oil passage consisting of the oil passage a, the oil guide ring groove and the oil passage b is communicated, the oil pressure regulating valve regulates the pressure of the hydraulic oil in the oil storage chamber at the moment, and the positions of the oil baffle disc, the plunger b and the spring a balanced with the hydraulic oil in the oil storage chamber are different due to the difference of the pressure of the hydraulic oil in the oil storage chamber, so that the hydraulic oil quantity in the oil storage chamber is also different. When the hydraulic oil duct is closed, the cam b-shaped line section pushes the plunger b to move downwards, the pressure of hydraulic oil in the oil storage chamber is gradually increased, and when the pressure reaches a certain value, the hydraulic oil pressure overcomes the pretightening force of the spring c to push the valve to move downwards, so that the valve is opened. Because the hydraulic oil quantity in the oil storage chamber in the previous process is different, the valve lift is also changed at the moment, the structure is simple and clear, and the feasibility is good.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to the technical field of engines, and especially relates to a valve lift adjusting mechanism.
Background
In the technical field of engines, a Variable Valve Lift (VVL) device plays a positive role in improving engine performance. The valve lift is the maximum stroke that the engine valve can lift from just opening to fully opening, and plays a decisive role in the intake and exhaust air quantity of each working cycle of the engine.
For different engine working conditions, different valve lifts are realized, so that the engine works in an ideal state under all working conditions. For example, when the engine is in a lower speed condition, the smaller valve lift is beneficial to increasing turbulence in the cylinder and improving combustion speed, and improving torque output of the engine at a low speed; when the engine is in the working condition of high rotating speed, the larger valve lift is favorable for reducing the air intake resistance, so that the air intake quantity is greatly improved, and the power output of the engine at high rotating speed is improved.
Therefore, a variable valve lift adjustment mechanism, if implemented, would better improve engine performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a variable valve lift adjusting mechanism which can solve the problems caused by the fixation of engine parameters, realize flexible adjustment and control of the valve lift parameters, further ensure that the engine has a good air distribution effect under various working conditions and improve the performance of the engine.
The invention provides an automobile engine variable valve lift adjusting mechanism which comprises a cylinder cover (1), a spring a (2), an oil pressure adjusting valve (3), a plunger a (4), a mounting block (5), a cam a (6), a cam shaft (7), a cam b (8), a plunger b (9), a stop block (10), a spring b (11), an oil baffle disc (12), an oil storage chamber (13), a spring c (14) and a valve (15), wherein the mounting block (5) is fixedly connected with the cylinder cover, and the spring a (2) is arranged in a plunger mounting hole a (504) formed in the mounting block (5); one end of the plunger a (4) is in sliding connection with the cam a (6), and the other end extends into the plunger mounting hole a (504) and is connected with the spring a (2); the oil pressure regulating valve (3) is arranged in a regulating valve mounting hole (501) formed in the mounting block (5); the cam a (6) and the cam b (8) are respectively fixedly connected to the outer surface of the cam shaft (7); the plunger b (9) is in sliding connection with the cam b (8), and the other end of the plunger b passes through a round hole in the center of the stop block (10) and stretches into a stepped plunger mounting hole b (505) formed in the mounting block (5); the baffle block (10) is connected with the mounting block (5) through threads, and the oil baffle disc (12) is fixedly connected to the outer surface of the plunger b (9); the spring b (11) is arranged between the stop block (10) and the oil baffle disc (12); the plunger a (4) is in clearance fit with the wall surface of the plunger mounting hole a (504), and the plunger b (9), the stop block (10) and the oil baffle disc (12) are in clearance fit with the wall surface of the valve and stepped plunger mounting hole b (505) in the same way.
Further, the plunger a (4) is provided with an oil guide ring groove (401), the mounting block (5) is provided with an oil pressure regulating valve mounting hole (501), an oil duct a (502), an oil duct b (503), a plunger mounting hole a (504) and a stepped plunger mounting hole b (505), wherein the oil duct b (503) is communicated with an oil storage chamber (13) surrounded by the plunger b (9), a stop block (12), a valve (15) and the stepped plunger mounting hole b (505); when the plunger a (4) leads the oil ring groove (401) to descend between the oil channel a (502) and the oil channel b (503), the oil channel a (502) and the oil channel b (503) are communicated, and when the oil lead the oil ring groove (401) to leave between the oil channel a (502) and the oil channel b (503), the oil channel a (502) and the oil channel b (503) are disconnected.
Further, the cam a (6) consists of a base circle segment a (601) and a molded line segment a (602), and the cam b (8) consists of a base circle segment b (801) and a molded line segment b (802); the arrangement positions of the profile line segment b (802) and the profile line segment a (602) on the cam shaft (7) are opposite, when the profile line segment b (802) of the cam b (8) rotates to the upper end of the plunger b (9), the base circle segment a (601) of the cam a (6) rotates to the upper end of the plunger a (4), and when the base circle segment b (801) rotates to the upper end of the plunger b (9), the profile line segment a (602) rotates to the upper end of the plunger a (4); meanwhile, when the molded line section b (802) rotates to the upper end of the plunger b (9), the oil guide ring groove (401) of the plunger a (4) is not arranged between the oil duct a (502) and the oil duct b (503), and the oil duct a (502) and the oil duct b (503) are disconnected; when the base line section b (801) rotates to the upper end of the plunger b (9), the oil guide ring groove (401) of the plunger a (4) moves between the oil passage a (502) and the oil passage b (503), and the oil passage a (502) and the oil passage b (503) are communicated.
Further, when the engine is normally operated, the cam a (6) and the cam b (8) rotate along with the cam shaft (7), when the cam a (6) line segment (602) is in contact with the plunger a (4), the cam a (6) pushes the plunger a (4) to move downwards against the elastic force of the spring a (2), the oil guide ring groove (401) in the plunger a (4) moves to a position between the oil duct a (502) and the oil duct b (503), at this time, the hydraulic oil duct from the oil pressure regulating valve (3) to the oil storage chamber (13) is conducted, and the vehicle-mounted ECU obtains the optimal valve lift amount according to the current working condition, so that the required hydraulic oil pressure is calculated, and the hydraulic oil pressure in the oil storage chamber (13) is controlled through the oil pressure regulating valve (3). Due to the existence of the pressure of the hydraulic oil in the oil storage chamber (13), the elasticity of the spring b (11) and the pressure of the hydraulic oil in the oil storage chamber (13) are balanced, and at the moment, the oil baffle disc (12) and the plunger b (9) float on the upper surface of the hydraulic oil in the oil storage chamber (13). Since the spring c (14) has a much higher spring constant than the spring b (11), the spring c (14) is not displaced significantly at this time. When the cam shaft (7) continues to rotate, the base circle section (601) of the cam a (6) is contacted with the plunger b (4), the spring a (2) pushes the plunger a (4) to move upwards, and the hydraulic oil way is blocked; the cam b (8) is in contact with the upper surface of the plunger b (9), the cam b (8) pushes the plunger b (9) to move downwards, the hydraulic oil way is blocked at the moment, the hydraulic oil pressure is continuously increased, and when the hydraulic oil pressure reaches a certain value, the valve (15) is opened by overcoming the pretightening force of the spring c (14) by the hydraulic oil pressure.
Further, when the working condition of the engine changes and the valve lift is required to be changed, when the cam a (6) line segment (602) is contacted with the plunger a (4), the vehicle-mounted ECU obtains the optimal valve lift according to the current working condition, so that the required hydraulic oil pressure is calculated, and the hydraulic oil pressure in the oil storage chamber (13) is controlled through the oil pressure regulating valve (3). If the valve lift is required to be increased at this time, when hydraulic oil enters the oil storage chamber (13), the oil baffle disc (12) and the plunger b (9) move upwards against the pretightening force of the spring (11) due to the action of the hydraulic oil pressure, and the movement distance is determined according to the hydraulic oil pressure, so that the hydraulic oil quantity in the oil storage chamber (13) is also changed. The change of the hydraulic oil quantity in the oil storage chamber (13) enables the opening time of the valve (15) to be earlier than that in the process when the cam b (8) type line segment (802) pushes the plunger b (9) downwards, and the descending distance of the valve (15) is larger when the plunger b (9) drives the oil baffle disc (12) to move to the bottom dead center because of more hydraulic oil in the oil storage chamber (13) than in the process, so that the increase of the valve lift is realized, and the reverse measures can be adopted to reduce the valve lift.
The guiding thought of the technical scheme is as follows: according to the variable valve lift adjusting mechanism, the hydraulic oil pressure in the oil storage chamber is accurately controlled through the oil pressure adjusting valve, so that the variable valve lift is realized. When the engine needs to change the valve lift to adjust the air inflow, when the hydraulic oil duct is opened, the ECU obtains the optimal valve lift of the current working condition according to the MAP graph of the prefabricated valve lift, so as to calculate the hydraulic oil pressure required for reaching the valve lift, and then the hydraulic oil pressure in the oil storage chamber (13) is adjusted through the oil pressure adjusting valve (3). If the valve lift is required to be increased at this time, the oil pressure regulating valve (3) controls the hydraulic oil way and the pressure of the hydraulic oil in the oil storage chamber (13) to be increased, on the one hand, because the elastic coefficient of the spring b (11) is lower, when the pressure of the hydraulic oil in the oil storage chamber (13) is increased, the hydraulic oil overcomes the elastic force of the spring b (11) to jack up the oil baffle disc (13) and the plunger b (9) upwards, and the current hydraulic oil quantity in the oil storage chamber (13) is also increased; on the other hand, since the spring coefficient of the spring c (14) is much higher than that of the spring b (11), the hydraulic pressure is increased but insufficient to open the valve (15) against the preload of the spring c (14). When the hydraulic oil passage is closed, a cam b (8) type line segment (802) is contacted with the upper surface of the plunger b (9), the cam b (8) pushes the plunger b (9) to move downwards, the hydraulic oil passage is blocked at the moment, the hydraulic oil pressure is continuously increased, and when the hydraulic oil pressure reaches a certain value, the hydraulic oil pressure overcomes the pretightening force of the spring c (14) to open the valve (15).
Compared with the prior art, the variable valve lift adjusting mechanism has the following advantages:
The invention realizes the function of flexibly adjusting the lift parameters of the valve, and effectively overcomes the defect that the traditional valve actuating mechanism can not adjust the opening of the valve along with the change of the working condition of the engine. The engine can obtain a better air distribution effect under any working condition, the dynamic property and the economical efficiency of the engine are improved, and the emission of harmful pollutants is reduced.
Drawings
FIG. 1 is a schematic diagram of a variable valve lift adjusting apparatus according to the present invention
FIG. 2 is a schematic view b of a variable valve lift adjusting apparatus according to the present invention
FIG. 3 is a cross-sectional view of a plunger a according to the present invention
FIG. 4 is a cross-sectional view of a mounting block according to the present invention
FIG. 5 is a cross-sectional view of a cam according to the present invention
FIG. 6 is a cross-sectional view of a cam b of the present invention
Wherein: 1. cylinder head 2, spring a 3, oil pressure regulating valve 4, plunger a 5, mounting block 6, cam a 7, cam b 9, plunger b 10, stop 11, spring b 12, oil dam 13, oil reservoir 14, spring c 15, valve 401, oil guide ring groove 501, regulating valve mounting hole 502, oil gallery a 503, oil gallery b 504, plunger mounting hole a 505, stepped plunger mounting hole b
Detailed Description
The following describes in further detail the components, mutual positions and mutual connection relations of the various parts, functions and working principles of the various parts, etc. according to the embodiments of the present invention.
As shown in fig. 1, the variable valve lift adjusting mechanism of the automobile engine comprises a cylinder cover (1), a spring a (2), an oil pressure adjusting valve (3), a plunger a (4), a mounting block (5), a cam a (6), a cam shaft (7), a cam b (8), a plunger b (9), a stop block (10), a spring b (11), an oil baffle disc (12), an oil storage chamber (13), a spring c (14) and a valve (15). The mounting block (5) is fixedly connected with the cylinder cover, and the spring a (2) is arranged in a plunger mounting hole a (504) formed in the mounting block (5); one end of the plunger a (4) is in sliding connection with the cam a (6), and the other end extends into the plunger mounting hole a (504) and is connected with the spring a (2); the oil pressure regulating valve (3) is arranged in a regulating valve mounting hole (501) formed in the mounting block (5); the cam a (6) and the cam b (8) are respectively fixedly connected to the outer surface of the cam shaft (7); the plunger b (9) is in sliding connection with the cam b (8), and the other end of the plunger b passes through a round hole in the center of the stop block (10) and stretches into a stepped plunger mounting hole b (505) formed in the mounting block (5); the baffle block (10) is connected with the mounting block (5) through threads, and the oil baffle disc (12) is fixedly connected to the outer surface of the plunger b (9); the spring b (11) is arranged between the stop block (10) and the oil baffle disc (12); the plunger a (4) is in clearance fit with the wall surface of the plunger mounting hole a (504), and the plunger b (9), the stop block (10) and the oil baffle disc (12) are in clearance fit with the wall surface of the valve and stepped plunger mounting hole b (505) in the same way.
As shown in fig. 3, one end of the plunger a (4) is provided with an oil guide ring groove (401).
As shown in fig. 4, the mounting block (5) is provided with an oil pressure regulating valve mounting hole (501), an oil duct a (502), an oil duct b (503), a plunger mounting hole a (504) and a stepped plunger mounting hole b (505), wherein the oil duct b (503) is communicated with an oil storage chamber (13) surrounded by the plunger b (9), a stop block (12), a valve (15) and the wall surface of the stepped plunger mounting hole b (505); when the plunger a (4) leads the oil ring groove (401) to descend between the oil channel a (502) and the oil channel b (503), the oil channel a (502) and the oil channel b (503) are communicated, and when the oil lead the oil ring groove (401) to leave between the oil channel a (502) and the oil channel b (503), the oil channel a (502) and the oil channel b (503) are disconnected.
As shown in fig. 5, the cam a (6) is composed of a base circle segment a (601) and a molded line segment a (602).
As shown in fig. 6, the cam b (8) is composed of a base circle segment b (801) and a molded line segment b (802).
As shown in fig. 1, when the engine is in normal operation, the cam a (6) and the cam b (8) rotate along with the cam shaft (7), in the process that the cam a (6) type line segment a (602) is gradually contacted with the plunger a (4), the cam a (6) applies a pressure to the plunger a (4), the pressure gradually increases along with the rotation of the cam a (4), and when the position shown in fig. 1 is reached, the pressure reaches the maximum value, in the process, the plunger a (4) overcomes the elasticity of the spring a (2) to move down, so that the oil guide ring groove (401) of the plunger a (4) moves between the oil duct a (502) and the oil duct b (503) in the mounting block (5), and a hydraulic oil way formed by the oil duct a (502), the oil guide ring groove (401) and the oil duct b (503) is conducted, thereby realizing the control of the hydraulic oil pressure regulating valve (3) on the hydraulic oil pressure in the oil storage chamber (13). The vehicle-mounted ECU obtains the optimal valve lift according to the current working condition, so that the required hydraulic oil pressure is calculated, and the hydraulic oil pressure in the oil storage chamber (13) is controlled through the oil pressure regulating valve (3). The hydraulic oil pressure holds the plunger b (9) and the oil baffle disc (12) at the positions as shown in the figure, the elastic force of the spring b (11) and the hydraulic oil pressure in the oil storage chamber (13) are balanced, and the elastic coefficient of the spring c (14) is far higher than that of the spring b (11), so that the spring c (14) does not generate obvious displacement.
As shown in fig. 2, as the cam shaft (7) continues to rotate, the cam a (6) segment (602) leaves the top of the plunger a (4), the base circle segment (601) of the cam a (6) contacts with the top of the plunger a (4), at this time, the spring a (2) pushes the plunger a (4) to move upwards to contact with the base circle segment (601) of the cam a (6), at this time, the oil guide ring groove (401) in the plunger a (4) is no longer located between the oil duct a (502) and the oil duct b (503), the hydraulic oil way is blocked, and the hydraulic oil in the oil storage chamber (13) is in a closed state. Because the cam b (8) is opposite to the cam a (6) in direction arrangement, at the moment, the cam b (8) line segment (802) is gradually contacted with the top of the plunger b (9), the contact process of the cam a (6) line segment a (602) and the plunger a (4) is similar to that of the previous process, and the hydraulic oil pressure is continuously increased in the process of pushing the plunger b (9) by the cam b (8) to descend due to the existence of the hydraulic oil in the oil storage chamber (13), and when the hydraulic oil pressure reaches a certain value, the valve (15) is opened by overcoming the pretightening force of the spring c (14) by the hydraulic oil pressure.
If the working condition of the engine is changed, and the valve lift is required to be changed so as to adjust the air inflow, when the hydraulic oil duct is opened, the ECU obtains the optimal valve lift of the current working condition according to the MAP chart of the prefabricated valve lift, so that the hydraulic oil pressure required for reaching the valve lift is calculated, and the hydraulic oil pressure in the oil storage chamber (13) is adjusted through the oil pressure adjusting valve (3). If the valve lift is required to be increased at this time, the oil pressure regulating valve (3) controls the hydraulic oil way and the pressure of the hydraulic oil in the oil storage chamber (13) to be increased, on the one hand, because the elastic coefficient of the spring b (11) is lower, when the pressure of the hydraulic oil in the oil storage chamber (13) is increased, the hydraulic oil overcomes the elastic force of the spring b (11) to jack up the oil baffle disc (13) and the plunger b (9) upwards, and the current hydraulic oil quantity in the oil storage chamber (13) is also increased; on the other hand, since the spring coefficient of the spring c (14) is much higher than that of the spring b (11), the hydraulic pressure is increased but insufficient to open the valve (15) against the preload of the spring c (14). The cam shaft (7) continues to rotate, when the base circle section (601) of the cam a (6) moves to be in contact with the top of the plunger a (4), the spring a (2) pushes the plunger a (4) to move upwards, the oil guide ring groove (401) is not located between the oil duct a (502) and the oil duct b (503), and the hydraulic oil way is blocked. At the same time, the cam b (8) type line segment (802) rotates to be in contact with the top of the plunger b (9), the cam b (8) pushes the plunger b (9) downwards, and as the hydraulic oil in the oil storage chamber (13) is closed, the hydraulic oil pressure in the oil storage chamber (13) continuously rises along with the downward movement of the plunger b (9) with the oil baffle disc (12). When the hydraulic oil pressure rises enough to overcome the preload of the spring c (14), the valve (15) moves downward under the hydraulic pressure, and the valve (15) opens as shown in fig. 2. And because the hydraulic oil quantity in the oil storage chamber (13) is increased in the process compared with the prior art, the valve opening time is earlier, the valve lift is increased, and the function is realized.
Claims (1)
1. The variable valve lift adjusting mechanism of the automobile engine is characterized by comprising a cylinder cover (1), a spring a (2), an oil pressure adjusting valve (3), a plunger a (4), a mounting block (5), a cam a (6), a cam shaft (7), a cam b (8), a plunger b (9), a stop block (10), a spring b (11), an oil baffle disc (12), an oil storage chamber (13), a spring c (14) and a valve (15), wherein the mounting block (5) is fixedly connected with the cylinder cover, and the spring a (2) is arranged in a plunger mounting hole a (504) formed in the mounting block (5); one end of the plunger a (4) is in sliding connection with the cam a (6), and the other end extends into the plunger mounting hole a (504) and is connected with the spring a (2); the oil pressure regulating valve (3) is arranged in a regulating valve mounting hole (501) formed in the mounting block (5); the cam a (6) and the cam b (8) are respectively fixedly connected to the outer surface of the cam shaft (7); the plunger b (9) is in sliding connection with the cam b (8), and the other end of the plunger b passes through a round hole in the center of the stop block (10) and stretches into a stepped plunger mounting hole b (505) formed in the mounting block (5); the baffle block (10) is connected with the mounting block (5) through threads, and the oil baffle disc (12) is fixedly connected to the outer surface of the plunger b (9); the spring b (11) is sleeved on the plunger b (9) and is arranged between the stop block (10) and the oil baffle disc (12); the plunger a (4) is in clearance fit with the wall surface of the plunger mounting hole a (504), the plunger b (9) is in clearance fit with a round hole in the center of the stop block (10), and the oil baffle disc (12) and the air valve (15) are in clearance fit with the wall surface of the stepped plunger mounting hole b (505) in the same way; the elastic coefficient of the spring c (14) is higher than that of the spring b (11);
the plunger a (4) is provided with an oil guide ring groove (401), the mounting block (5) is provided with an oil pressure regulating valve mounting hole (501), an oil duct a (502), an oil duct b (503), a plunger mounting hole a (504) and a stepped plunger mounting hole b (505), wherein the oil duct b (503) is communicated with an oil storage chamber (13) surrounded by the wall surfaces of the plunger b (9), the oil baffle disc (12), the air valve (15) and the stepped plunger mounting hole b (505);
The cam a (6) consists of a base circle segment a (601) and a molded line segment a (602), and the cam b (8) consists of a base circle segment b (801) and a molded line segment b (802); the arrangement positions of the profile segment b (802) and the profile segment a (602) on the cam shaft (7) are opposite, when the profile segment b (802) of the cam b (8) rotates to be in contact with the top of the plunger b (9), the base circle segment a (601) of the cam a (6) rotates to be in contact with the top of the plunger a (4), and when the base circle segment b (801) rotates to the upper end of the plunger b (9), the profile segment a (602) rotates to be in contact with the top of the plunger a (4); meanwhile, when the molded line section b (802) rotates to be in contact with the top of the plunger b (9), the oil guide ring groove (401) of the plunger a (4) is not arranged between the oil duct a (502) and the oil duct b (503), and the oil duct a (502) and the oil duct b (503) are disconnected; when the base circle section b (801) rotates to the upper end of the plunger b (9), the oil guide ring groove (401) of the plunger a (4) moves between the oil duct a (502) and the oil duct b (503), and the oil duct a (502) and the oil duct b (503) are communicated;
If the working condition of the engine is changed, the valve lift is required to be changed so as to adjust the air inflow; if the valve lift is required to be increased at this time, the oil pressure regulating valve (3) controls the hydraulic oil way and the pressure of the hydraulic oil in the oil storage chamber (13) to be increased, when the pressure of the hydraulic oil in the oil storage chamber (13) is increased, the hydraulic oil overcomes the elasticity of the spring b (11) to jack up the oil baffle disc (12) and the plunger b (9) upwards, and the current hydraulic oil quantity in the oil storage chamber (13) is also increased; since the spring coefficient of the spring c (14) is far higher than that of the spring b (11), the hydraulic pressure is insufficient to overcome the pretightening force of the spring c (14) to open the valve (15); the cam shaft (7) continues to rotate, when the base circle section a (601) of the cam a (6) moves to be in contact with the top of the plunger a (4), at the moment, the spring a (2) pushes the plunger a (4) to move upwards, the oil guide ring groove (401) is not positioned between the oil duct a (502) and the oil duct b (503), a hydraulic oil way is blocked, meanwhile, the cam b (8) type line section b (802) rotates to be in contact with the top of the plunger b (9), the cam b (8) pushes the plunger b (9) downwards, and as the hydraulic oil in the oil storage chamber (13) is closed, the hydraulic oil pressure in the oil storage chamber (13) continuously rises along with the downward movement of the plunger b (9) along with the oil baffle disc (12), the valve (15) moves downwards under the action of the hydraulic oil pressure when the hydraulic oil pressure rises enough to overcome the pretightening force of the spring c (14), and the valve (15) is opened; in the process, the hydraulic oil quantity in the oil storage chamber (13) is increased, the valve opening time is advanced, and the valve lift is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810720689.3A CN108691597B (en) | 2018-07-03 | 2018-07-03 | Variable valve lift adjusting mechanism of automobile engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810720689.3A CN108691597B (en) | 2018-07-03 | 2018-07-03 | Variable valve lift adjusting mechanism of automobile engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108691597A CN108691597A (en) | 2018-10-23 |
| CN108691597B true CN108691597B (en) | 2024-05-14 |
Family
ID=63851414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810720689.3A Active CN108691597B (en) | 2018-07-03 | 2018-07-03 | Variable valve lift adjusting mechanism of automobile engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108691597B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188662A (en) * | 2020-01-07 | 2020-05-22 | 绵阳华博精工机械有限公司 | Valve mechanism |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502425A (en) * | 1981-01-20 | 1985-03-05 | Marlene A. Wride | Variable lift cam follower |
| JPH05340219A (en) * | 1992-03-04 | 1993-12-21 | Robert Bosch Gmbh | Hydraulically actuated valve control apparatus for engine valve |
| JPH07259519A (en) * | 1994-03-23 | 1995-10-09 | Nissan Motor Co Ltd | Variable valve system of internal combustion engine |
| CN103742216A (en) * | 2014-01-24 | 2014-04-23 | 赵迎生 | Lift-variable hydraulic tappet |
| CN104481625A (en) * | 2014-11-13 | 2015-04-01 | 浙江师范大学 | Variable valve timing system |
| CN105604625A (en) * | 2016-03-07 | 2016-05-25 | 吉林大学 | Cam-driving engine hydraulic valve control device |
| CN105781656A (en) * | 2016-04-23 | 2016-07-20 | 吉林大学 | Mechanical adjusting device of hydraulic drive type fully-variable valve |
| CN208380652U (en) * | 2018-07-03 | 2019-01-15 | 吉林大学 | A kind of automobile engine lift range variable regulating mechanism |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2510201B1 (en) * | 2009-12-08 | 2015-01-07 | Schaeffler Technologies GmbH & Co. KG | Internal combustion engine having electrohydraulic valve control and method for operating said internal combustion engine |
| KR20120017982A (en) * | 2010-08-20 | 2012-02-29 | 현대자동차주식회사 | Electro-hydraulic variable vavlve lift apparatus |
-
2018
- 2018-07-03 CN CN201810720689.3A patent/CN108691597B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502425A (en) * | 1981-01-20 | 1985-03-05 | Marlene A. Wride | Variable lift cam follower |
| JPH05340219A (en) * | 1992-03-04 | 1993-12-21 | Robert Bosch Gmbh | Hydraulically actuated valve control apparatus for engine valve |
| JPH07259519A (en) * | 1994-03-23 | 1995-10-09 | Nissan Motor Co Ltd | Variable valve system of internal combustion engine |
| CN103742216A (en) * | 2014-01-24 | 2014-04-23 | 赵迎生 | Lift-variable hydraulic tappet |
| CN104481625A (en) * | 2014-11-13 | 2015-04-01 | 浙江师范大学 | Variable valve timing system |
| CN105604625A (en) * | 2016-03-07 | 2016-05-25 | 吉林大学 | Cam-driving engine hydraulic valve control device |
| CN105781656A (en) * | 2016-04-23 | 2016-07-20 | 吉林大学 | Mechanical adjusting device of hydraulic drive type fully-variable valve |
| CN208380652U (en) * | 2018-07-03 | 2019-01-15 | 吉林大学 | A kind of automobile engine lift range variable regulating mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108691597A (en) | 2018-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108590799B (en) | Hydraulically-driven fully-variable valve actuating mechanism | |
| WO1983001483A1 (en) | Variable valve operating mechanism for internal combustion engines | |
| CN104454070A (en) | Electric-control hydraulic adjustment mechanism based on camshaft and allowing valve lift to be changed continuously | |
| CN102383892A (en) | Variable air valve lift mechanism of internal combustion engine | |
| CN203130181U (en) | Novel adjustable hydraulic tappet | |
| CN101446214B (en) | Continuously adjustable mechanical hydraulic valve lift device | |
| CN204082245U (en) | The electrodeless variable valve gear of a kind of motor | |
| CN108691597B (en) | Variable valve lift adjusting mechanism of automobile engine | |
| CN105019966A (en) | High-power engine brake device and method | |
| CN103939171A (en) | Variable valve lift mechanism of engine | |
| CN108087051B (en) | Engine continuous variable valve lift hydraulic tappet mechanism | |
| CN102852585B (en) | Continuous and changeable valve lift control mechanism | |
| CN202866918U (en) | Variable valve stroke mechanism of engine | |
| CN208380652U (en) | A kind of automobile engine lift range variable regulating mechanism | |
| CN204827575U (en) | Valve lift adjustment mechanism and vehicle | |
| CN101713308A (en) | Hydraulic valve mechanism of variable valve lift | |
| CN105673120A (en) | Continuously variable valve stroke mechanism | |
| CN107762587B (en) | Actuating mechanism, variable valve lift device, engine and automobile | |
| CN201314249Y (en) | Time-delay closing system of two-section engine intake valve controlled by slide valve | |
| CN215860509U (en) | Cylinder deactivation mechanism and motor-controlled variable valve device based on cylinder deactivation mechanism | |
| CN104420914A (en) | Continuously-adjustable adjustment method and device for valve timing of engine | |
| CN102400734B (en) | Engine valve lift variable device | |
| CN207093167U (en) | A kind of slow seating arrangement for slowing down valve crash speed | |
| CN110159382A (en) | A kind of electro-hydraulic regulation device of valve timing | |
| CN115898585B (en) | Motor-driven variable valve lift mechanism of variable-length tappet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | 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 |