CN102705027A - Valve stroke variable adjusting system - Google Patents

Abstract

The invention discloses a variable valve lift adjustment system, which includes a valve mechanism, a valve driving group, a hydraulic clearance adjuster and a power source for the regulator; the valve driving group is composed of a rocker arm bearing, a finger-shaped rocker arm and a camshaft. The camshaft is fixed on the engine block through bearings. One end of the finger-shaped rocker arm has an arc-shaped groove, which is in contact with the head of the plunger of the hydraulic clearance adjuster. The middle section of the finger-shaped rocker arm is installed with a rocker arm bearing. The rocker arm bearing is in rolling contact with the camshaft. The other end of the finger-shaped rocker arm is finger-shaped and presses the valve. The rotation of the camshaft drives the finger-shaped rocker arm to swing around the head of the plunger, thereby controlling the opening and closing of the valve. In the present invention, the position of the hydraulic gap adjuster is driven by the stepping motor to change the opening of the valve, thereby controlling the amount of intake air, which is beneficial to improving fuel efficiency. The use of rocker arm bearings can reduce shock and vibration during transmission and reduce noise.

Description

A variable valve lift adjustment system

technical field

The invention belongs to the technical field of automobile engines, and in particular relates to a variable valve lift adjustment system.

Background technique

The adoption of variable valve lift (VVL) enables the engine to obtain the required valve lift in both high-speed and low-speed areas, thereby improving the high-speed power and low-speed torque of the engine. While the variable valve lift technology greatly improves engine performance, it also has its unique advantages in terms of energy saving and environmental protection. The continuously variable valve lift can be used to adjust the valve opening steplessly in a certain area, so that the driving will have no abrupt feeling, the comfort is strong, and the adaptability of the valve train at various speeds is also stronger. Maximizes engine charging efficiency.

The valve lift of a traditional gasoline engine is fixed and invariable, so it is impossible to make the engine respond well in both high-speed and low-speed areas. The valve lift design of a traditional gasoline engine is a balanced choice for the engine under all working conditions. The result is an engine that gets neither optimum high-speed efficiency nor optimum low-speed torque.

The existing Chinese patent CN102364065A is also a variable valve lift adjustment device, but this patent uses a rotatable eccentric shaft embedded in the cylinder head to adjust the valve opening. The structure is complex, installation and control are difficult, and it cannot be accurately and continuously Control the valve opening.

Contents of the invention

The purpose of the present invention is to provide a variable valve lift adjustment system which has a simple structure and can continuously and accurately adjust the valve lift.

The technical scheme adopted for solving the above-mentioned technical problems is:

A variable valve lift adjustment system is mainly composed of a valve mechanism 1, a valve drive group 2, a hydraulic clearance adjuster 3 and a power source 4 for the adjuster. The finger rocker arm 21 in the valve train 2 uses the hydraulic lash adjuster 3 as a fulcrum, and the rotation of the camshaft 22 drives the finger rocker arm 21 to swing, thereby realizing the opening and closing of the valve mechanism 1 . When the speed of the vehicle changes, the control system controls the stepper motor 41 in the regulator power source 4 to drive the gear 40 to rotate, and through the meshing of the rack and pinion, the position of the hydraulic gap adjuster 3 is continuously and accurately adjusted, that is, the position in the lever is changed. The fulcrum position changes the swing range of the finger rocker arm 21 to realize the change of the valve lift.

The valve mechanism 1 is composed of a cylinder head 10 , a valve guide 11 , a valve 12 , a valve spring 13 , a valve spring seat 14 and a lock plate 15 . The cylinder head 10 is connected with the engine block, and the valve guide 11 acts as a guide to ensure the linear reciprocating motion of the valve 12 and make the valve 12 and the valve spring seat 14 fit correctly. The top of valve spring 13 is connected with valve spring seat 14, and the bottom of valve spring 13 is fixed on the engine block, and valve spring 13 is in compressed state when valve 12 is opened, can guarantee that valve 12 returns in time. The locking plate 15 is fixed between the valve 12 and the valve spring seat 14, so as to realize the sealing effect of the valve spring seat 14 and the head of the valve 12 on the cylinder. The function of the valve spring 13 is to overcome the inertial force of the valve 12 and the transmission parts during the closing process of the valve 12, prevent gaps between the transmission parts due to the action of inertial force, ensure that the valves are seated in time and fit closely, and prevent the valve 12 from occurring. Vibration destroys its tightness.

The valve train 2 is composed of a rocker arm bearing 20 , a finger rocker arm 21 and a camshaft 22 . The camshaft 22 is fixed on the engine block through bearings. One end of the finger-shaped rocker arm 21 has an arc-shaped groove, which is in contact with the head of the plunger 31 of the hydraulic clearance adjuster 3. The middle section of the finger-shaped rocker arm 21 is installed There is a rocker arm bearing 20, and the rocker arm bearing 20 is in rolling contact with the camshaft 22. The other end of the finger-shaped rocker arm 21 is finger-shaped and presses the valve 12, so that the finger-shaped rocker arm 21 uses the hydraulic clearance adjuster 3 as a fulcrum. Along with the rotation of the camshaft 22, the finger-shaped rocker arm 21 swings around the head of the plunger 31, and the finger-shaped end pressing the valve 12 swings up and down, thereby controlling the opening and closing of the valve 12.

The hydraulic clearance adjuster 3 is composed of a housing 30 , a plunger 31 , a one-way valve 32 , a return spring 33 , a spring retainer 34 and a check ball 35 . The hydraulic oil flows in from the oil inlet side of the one-way valve 32, the check ball 35 is pushed away under the oil pressure, the one-way valve 32 is opened, and the hydraulic oil enters the cavity of the plunger 31. Under the action, the plunger 31 stretches out; when the external force on the plunger 21 is large, the plunger 31 retracts, the check ball 35 blocks the oil inlet, and the hydraulic oil cannot return from the original path. The gap between the housings 30 leaks, causing the plunger 31 to slowly retract. One side of the housing 30 is processed or fixedly installed with a rack.

The regulator power source 4 is composed of a gear 40 and a stepping motor 41 . The stepping motor 41 is fixed on the engine block, the gear 40 is driven by the stepping motor 41, and the gear 40 meshes with the rack on the housing 30, thereby continuously and accurately adjusting the position of the hydraulic lash adjuster 3 .

The beneficial effects of the present invention are: the constant hydraulic pressure can adjust the expansion and contraction of the hydraulic gap adjuster, and the regulator power source driven by the stepping motor controls the position of the hydraulic gap adjuster, which can change the opening of the engine valve at different speeds, Thereby controlling the intake air volume is conducive to improving fuel efficiency. The use of rocker arm bearings can reduce shock and vibration during transmission and reduce noise.

Description of drawings

Figure 1 is the overall assembly diagram of the variable valve lift adjustment system

Fig. 2 is a simplified structural diagram of the valve train 1 in Fig. 1

Fig. 3 is a simplified structural diagram of the valve train 2 in Fig. 1

Fig. 4 is an assembly diagram of the hydraulic clearance adjuster 3 in Fig. 1

Fig. 5 is a schematic structural diagram of the regulator power source 4 in Fig. 1

1. Valve mechanism; 10. Cylinder head; 11. Valve guide; 12. Valve; 13. Valve spring; 14. Valve spring seat; 15. Lock plate.

2. Valve drive group; 20. Rocker arm bearing; 21. Finger mounted rocker arm; 22. Camshaft.

3. Hydraulic gap adjuster; 30. Shell; 31. Plunger; 32. Check valve; 33. Return spring; 34. Spring retainer; 35. Check ball.

4. Regulator power source; 40, gear; 30, housing (rack processed on the housing); 41, stepping motor.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is the overall assembly diagram of the present invention, it can be seen that a novel variable valve lift adjustment system of the present invention is mainly composed of a valve train 1, a valve train 2, a hydraulic clearance adjuster 3 and a power source 4 for the adjuster. The finger rocker arm 21 in the valve train 2 uses the hydraulic lash adjuster 3 as a fulcrum, and the rotation of the camshaft 22 drives the finger rocker arm 21 to swing, thereby realizing the opening and closing of the valve mechanism 1 . When the speed of the vehicle changes, the control system controls the stepper motor 41 in the regulator power source 4 to drive the gear 40 to rotate, and through the meshing of the rack and pinion, the position of the hydraulic gap adjuster 3 is continuously and accurately adjusted, that is, the position in the lever is changed. The position of the fulcrum, thereby changing the swing range of the finger rocker arm 21, realizes the change of the valve lift.

2 is a schematic structural diagram of the valve mechanism 1, the valve mechanism 1 is composed of a cylinder head 10, a valve guide 11, a valve 12, a valve spring 13, a valve spring seat 14 and a locking plate 15. The cylinder head 10 is connected with the engine block, and the valve guide 11 acts as a guide to ensure the linear reciprocating motion of the valve 12 and make the valve 12 and the valve spring seat 14 fit correctly. The top of valve spring 13 is connected with valve spring seat 14, and the bottom of valve spring 13 is fixed on the engine block, and valve spring 13 is in compressed state when valve 12 is opened, can guarantee that valve 12 returns in time. The locking plate 15 is fixed between the valve 12 and the valve spring seat 14, so as to realize the sealing effect of the valve spring seat 14 and the head of the valve 12 on the cylinder. The function of the valve spring 13 is to overcome the inertial force of the valve 12 and the transmission parts during the closing process of the valve 12, prevent gaps between the transmission parts due to the action of inertial force, ensure that the valves are seated in time and fit closely, and prevent the valve 12 from occurring. Vibration destroys its tightness.

FIG. 3 is a schematic structural diagram of the valve train 2 . The valve train 2 is composed of a rocker arm bearing 20 , a finger rocker arm 21 and a camshaft 22 . The camshaft 22 is fixed on the engine block through bearings. One end of the finger-shaped rocker arm 21 has an arc-shaped groove, which is in contact with the head of the plunger 31 of the hydraulic clearance adjuster 3. The middle section of the finger-shaped rocker arm 21 is installed There is a rocker arm bearing 20, and the rocker arm bearing 20 is in rolling contact with the camshaft 22. The other end of the finger-shaped rocker arm 21 is finger-shaped and presses the valve 12, so that the finger-shaped rocker arm 21 uses the hydraulic clearance adjuster 3 as a fulcrum. Along with the rotation of the camshaft 22, the finger-shaped rocker arm 21 swings around the head of the plunger 31, and the finger-shaped end pressing the valve 12 swings up and down, thereby controlling the opening and closing of the valve 12.

FIG. 4 is an assembly diagram of the hydraulic clearance adjuster 3, which is composed of a housing 30, a plunger 31, a one-way valve 32, a return spring 33, a spring retainer 34, and a check ball 35. The hydraulic oil flows in from the oil inlet side of the one-way valve 32, the check ball 35 is pushed away under the oil pressure, the one-way valve 32 is opened, and the hydraulic oil enters the cavity of the plunger 31. Under the action, the plunger 31 stretches out; when the external force on the plunger 21 is large, the plunger 31 retracts, the check ball 35 blocks the oil inlet, and the hydraulic oil cannot return from the original path. The gap between the housings 30 leaks, causing the plunger 31 to slowly retract. One side of the housing 30 is processed or fixedly installed with a rack.

FIG. 5 is a schematic structural diagram of the regulator power source 4 . The regulator power source 4 is composed of a gear 40 and a stepping motor 41 . The stepping motor 41 is fixed on the engine block, the gear 40 is driven by the stepping motor 41, and the gear 40 meshes with the rack on the housing 30, thereby continuously and accurately adjusting the position of the hydraulic lash adjuster 3 .

Claims (5)

1. A variable valve lift adjustment system, including a valve mechanism (1) and a valve train (2), characterized in that it also includes a hydraulic clearance adjuster (3) and an adjuster power source (4); The regulator power source (4) drives the hydraulic clearance adjuster (3) to move in translation, and then adjusts the swing range of the valve drive group (2), so as to realize the change of the lift of the valve (12) in the valve mechanism (1). 2. A variable valve lift adjustment system according to claim 1, characterized in that: the valve train (2) consists of a rocker arm bearing (20), a finger rocker arm (21) and a camshaft (22), the camshaft (22) is fixed on the engine block through bearings, one end of the finger-shaped rocker arm (21) has an arc-shaped groove, and the plunger (31) of the hydraulic clearance adjuster (3) The head contact connection, the middle section of the finger rocker arm (21) is equipped with a rocker arm bearing (20), the rocker arm bearing (20) is in rolling contact with the camshaft (22), and the other end of the finger rocker arm (21) is a finger Pressing the valve (12), the rotation of the camshaft (22) drives the finger-shaped rocker arm (21) to swing around the head of the plunger (31), and the finger-shaped end pressing the valve (12) swings up and down. Then control the opening and closing of the air valve (12); The stepper motor (41) in the adjuster power source (4) drives the gear (40) to rotate, and through the meshing of the rack and pinion, the position of the hydraulic gap adjuster (3) is continuously and accurately adjusted, that is, the position of the hydraulic gap adjuster (3) is changed. The position of the fulcrum, thereby changing the swing range of the finger rocker arm (21), and realizing the change of the lift of the valve (12) in the valve train (1). 3. A variable valve lift adjustment system according to claim 2, characterized in that: the valve mechanism (1) consists of a cylinder head (10), a valve guide (11), a valve (12), a valve Composed of spring (13), valve spring seat (14) and lock plate (15), the cylinder head (10) is connected with the engine block, and the valve guide (11) acts as a guide to ensure that the valve (12) does linear reciprocating motion, and Make the valve (12) fit correctly with the valve spring seat (14); the upper part of the valve spring (13) is connected with the valve spring seat (14), the lower part of the valve spring (13) is fixed on the engine block, and the valve spring ( 13) When the valve (12) is opened, it is in a compressed state, and the locking piece (15) is fixed between the valve (12) and the valve spring seat (14). 4. A variable valve lift adjustment system according to claim 2, characterized in that: the hydraulic clearance adjuster (3) consists of a housing (30), a plunger (31), a one-way valve ( 32), return spring (33), spring retainer (34) and check ball (35), the hydraulic oil flows in from the oil inlet side of the check valve (32), and the check ball is pushed open under oil pressure (35), open the one-way valve (32), the hydraulic oil enters the cavity of the plunger (31), and the plunger (31) protrudes under the action of the return spring (33) and oil pressure; when the external pressure on the plunger ( 21) When the force is large, the plunger (31) retracts, the check ball (35) blocks the oil inlet, and the hydraulic oil cannot return from the original path. The gap between them leaks, so that the plunger (31) is slowly retracted, and one side of the housing (30) is processed or fixedly installed with a rack. 5. A variable valve lift adjustment system according to claim 4, characterized in that: said regulator power source (4) is composed of a gear (40) and a stepping motor (41), and the stepping motor (41) is fixed on the engine block, the stepper motor (41) drives the gear (40) to rotate, and the gear (40) meshes with the rack on the housing (30) to continuously and accurately adjust the hydraulic gap adjuster (3) The location.

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