KR20020085288A - Vane type continuously variable valve timing apparatus of vehicle - Google Patents

Abstract

PURPOSE: An optimum engine output is maintained by improving respondence of valve shutting in a continuous variable valve timing device. CONSTITUTION: A continuous variable valve timing device comprises a valve timing controller(10) to generate valve timing variable control signal by an engine rpm of an automobile. An oil control operating portion(20) has an advance hole and a retard hole to convert oil flow passing the advance hole and retard hole to form an advance passage and retard passage by received valve timing variable control signal. A cylinder head is mounted with the oil control operating portion. A vane housing(50) has an advance chamber and a retard chamber corresponding to the advance hole and the retard hole to change a cam shaft position by oil pressure difference of the advance chamber and the retard chamber.

Description

VAN TYPE CONTINUOUSLY VARIABLE VALVE TIMING APPARATUS OF VEHICLE}

The present invention relates to a vehicle, and more particularly, to a vane type continuous variable valve timing apparatus of a vehicle.

In general, in order to increase the engine efficiency of the vehicle, it is necessary to change the valve opening and closing timing at the high speed and the low speed of the engine according to the driving conditions of the vehicle.

In particular, the intake valve opening time is a factor that greatly affects the filling efficiency. If the intake valve is opened early, the valve overlap period becomes longer, so that the intake and exhaust inertia flow can be sufficiently used at high speed, but the volumetric efficiency is increased. Rather, the volumetric efficiency decreases and HC emissions increase.

In order to solve such problems, a device for changing the opening and closing time of the intake and exhaust valves has been developed and applied.The method for changing the opening and closing time of the intake and exhaust valves is an intake camshaft phase shifting method that controls the opening and closing time of the intake valve. And a method of assembling the high speed cam and the low speed cam so that the intake cams have different profiles, and converting the opening and closing timing and the lift, respectively.

Until now, the intake cam phase change method has been most commonly used, which is simple in structure and can expect some improvement in performance.

The intake cam phase shift method is to adjust the valve overlap in two stages by changing the phase of the intake cam by a predetermined angle according to the engine speed and load.

In addition, the high-speed cam and the low-speed cam of the dual system is installed by the high-speed and low-speed cams with different profiles, respectively, not only the valve timing but also the lift. This type is designed to switch according to engine speed by using hydraulic mechanism and lever.

The high speed cam has a large valve lift so that a large amount of air can be sucked in, the valve operating angle is large, and the low speed cam has a low lift and a low intake valve operating angle to reduce valve overlap.

Most conventional engines using the variable valve timing device as described above have to design the intake and exhaust cams according to the vehicle type or the performance of the vehicle and due to the limitation of design change depending on the installation space of the variable valve timing device. There was a problem that the response of the opening and closing time of the valve according to the running conditions of not properly responded.

An object of the present invention is to provide a vane type continuous variable valve timing apparatus of a vehicle that can improve the response of the valve opening and closing time to maintain the optimum engine output according to the driving conditions of the vehicle.

In order to achieve the above object, the present invention provides a vane type continuous variable valve timing apparatus of a vehicle, comprising: a valve timing controller configured to generate a predetermined valve timing variable control signal according to an engine rotation speed of the vehicle; It has an advance hole and a perception hole, and the flow of oil supplied and discharged through the advance hole and the perception hole to form a corresponding advance passage and the perception passage in accordance with the input of the variable valve timing control signal supplied from the valve timing control unit An oil control drive for converting; A cylinder head in which an advance passage and a perception passage are respectively formed for supplying and discharging oil supplied through the advance hole and the perception hole of the oil control drive in a state where the oil control drive is mounted; A camshaft having an advance oil hole and a perceptual oil hole respectively connected to the advance passage and the perceptual passage formed in the cylinder head in a state of being mounted to the cylinder head; an advance angle connected to the advance oil hole and the perceptual oil hole of the camshaft, respectively; It has a chamber (Addvance Chamber) and a retard chamber (Retard Chamber), characterized in that it comprises a vane housing for varying the phase of the camshaft according to the difference in the oil pressure supplied to the chamber and the perception chamber.

1 is a view illustrating a cylinder head in a state in which a vane type continuous variable valve timing apparatus of a vehicle according to an exemplary embodiment of the present invention is mounted.

2 is an assembly view showing a coupling relationship of the oil circuit configuration according to an embodiment of the present invention.

3 illustrates a cylinder head upper shape according to an embodiment of the present invention.

4 is a view conceptually illustrating an advance passage and a perceptual passage of a vane-type continuous variable valve timing apparatus of a vehicle according to an exemplary embodiment of the present invention.

5 conceptually illustrates an advance passage and a perceptual passage between related parts coupled to a cylinder head in accordance with an embodiment of the present invention;

6 is an oil circuit diagram of a vane type continuous variable valve timing apparatus of a vehicle according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 to 6, a vane type continuous variable valve timing apparatus of a vehicle according to an exemplary embodiment of the present invention may include a valve timing controller 10, an oil control driver 20, a cylinder head 30, and a camshaft 40. It comprises a vane housing 50.

First, the valve timing controller 10 controls the overall operation of the vane-type continuous variable valve timing apparatus of the vehicle according to the embodiment of the present invention, and in particular, generates a preset valve timing variable control signal according to the engine rotation speed of the vehicle. Function

The valve timing control unit 10 uses a kind of microprocessor, and analyzes a signal input from a sensor for detecting an engine rotational speed to provide a variable valve timing control signal to advance the phase angle of the camshaft 40 during the high speed rotation of the engine. Occurs. According to such a control operation, the valve overlap is increased so that the inertia of the air can be fully utilized during the high speed rotation of the engine, and the volumetric efficiency is improved and the output is improved.

On the contrary, the valve timing controller 10 generates a variable valve timing control signal so as to perceive the phase angle of the camshaft 40 during the low speed rotation of the engine. According to such a control operation, the valve overlap is reduced, ensuring idling stability, efficient use of combustion energy, and improving torque at low speed.

Here, the change in the valve overlap means a change in the valve timing, the variable valve timing means to change only the timing of the valve opening and closing timing.

The oil control driving unit 20 has an advance hole 21 and a perception hole 22, and is advanced to form a corresponding advance flow path and a perception flow path according to input of a valve timing variable control signal supplied from the valve timing control unit 10. An oil control valve converts a flow of oil supplied and discharged through the hole 21 and the tectonic hole 22. The formation of the advance passage and the late passage in accordance with the operation of the oil control drive unit 20 is made by the movement of the spool valve 26.

For reference, as shown in FIGS. 5 and 6, the advance passage according to the embodiment of the present invention includes the advance passage 21 of the oil control drive unit 20 and the advance passage 31 of the cylinder head 30. It consists of the advance chamber 51 of the advance oil hole 41 of the vane housing 50, and the vane housing 50. As shown in FIG.

On the other hand, the tectonic flow channel according to the embodiment of the present invention, as shown in FIGS. 5 and 6, the tectonic passage 22 of the oil control drive 20 ⇒ the tectonic passage 32 of the cylinder head 30 ⇒ the camshaft 40. Crust oil hole 42) → vanes housing 50 of the crust chamber 52.

The oil control driving unit 20 is based on the supply hole 23 through which the oil supplied from the oil pump 60 is filtered through the oil filter 62 and then introduced, and as shown in FIG. 1. In addition, each of the discharge holes 24 and 25 are further provided to return the oil circulated through the advance hole 21 and the earth hole 22 to the oil storage unit 64 at both sides.

The cylinder head 30 is formed as shown in FIGS. 3 and 4 and through the advance hole 21 and the tectonic hole 22 of the oil control driver 20 in a state where the oil control driver 20 is mounted. An advance passage 31 and a perception passage 32 for supplying and discharging the oil to be supplied are respectively formed.

On the other hand, referring to Figure 2, it can be seen that the oil circuit formed in the cylinder head 30. For example, as described above, the connection relationship between the advance passage 31 and the perceptual passage 32 formed in the cylinder head 30 in the state in which the oil control driver 20 is mounted can be seen.

Reference numeral 61 denotes an oil supply line supplied to the oil control drive 20 through the oil pump 60, the oil filter 62, and the oil pressure switch 63. Further, reference numeral 65 denotes a true oil drain line, and reference numeral 66 denotes a crust oil drain line.

Here, the drain line refers to a line in which oil is returned and flows into the oil storage unit 64. That is, the oil is introduced into the oil storage unit 64 through the crust drain line 66 when the advance passage is formed, and the oil is stored in the oil reservoir 64 through the advance drain line 65 when the late passage is formed. Flows into.

The camshaft 40 has an advance oil hole 41 and a perceptual oil hole 42 respectively connected to the advance passage 31 and the perception passage 32 formed in the cylinder head 30 while being mounted to the cylinder head 30. Has

The advance oil hole 41 and the perceptual oil hole 42 formed in the camshaft 40 are formed to be spaced apart from each other at predetermined intervals in the longitudinal direction, and the length of the perceptual oil hole 42 is the advance oil hole 41. It is formed longer than the length of.

The cam shaft 40 is provided with a rotor 43 having at least one vane 44 coupled to an outer circumferential surface of one end thereof.

The vane housing 50 forms a sprocket 54 on the outer circumferential surface to interlock with the engine rotation of the vehicle, and has a vane arm 53 on the inner circumferential surface to limit the movement of the vane 44. Advance chamber 51 and perception chamber connected to the advance oil hole 41 and the perceptual oil hole 42 of the camshaft 40 by the coupling space of the rotor 43 and the vane arm 53 ( 52) (Retard Chamber) is formed.

The phase of the camshaft 40 is varied according to the difference in the oil pressure supplied to the true chamber 51 and the perceptual chamber 52 of the vane housing 50.

In other words, changing the phase between the camshaft 40 and the sprocket 54 by using the oil pressure in the engine is a basic principle of the vane type continuous variable valve timing device, and it is necessary to advance or perceive the phase angle to the vane housing 50. Finely actuated engine oil pressure on vanes 44 located within it changes the phase.

1 to 6, a process in which the camshaft 40 is advanced or retarded according to the rotational speed of the engine by driving the vane-type continuous variable valve timing apparatus of the vehicle according to the exemplary embodiment of the present invention will be described.

First, the process of advancing the camshaft 40 will be described. The valve timing controller 10 analyzes a signal input from a sensor detecting the engine rotational speed to advance the phase angle of the camshaft 40 during the high speed rotation of the engine. The valve timing variable control signal is generated.

When a preset valve timing variable control signal (advanced control signal) is supplied from the valve timing controller 10 to the oil control driver 20, the spool valve 26 moves to the left side and oil flowing from the oil pump 60 is oil. It is supplied to the advance hole 21 through the supply hole 23 of the control driver 20.

The flow of oil then passes through the advance passage 31 of the cylinder head 30 connected to the advance hole 21 and the advance oil hole 41 of the camshaft 40 to the advance chamber 51 of the vane housing 50. Supplied.

According to the pressure of the oil supplied to the advance chamber 51 of the vane housing 50, hydraulic pressure is added to the advance chamber 51, and the rotor 43 integral with the cam shaft 40 rotates in the forward direction.

As described above, when oil flows into the advance chamber 51 of the vane housing 50 according to the rotational state of the engine, the phase angle of the cam shaft 40 is converted into the advance direction.

On the contrary, when the process of perceiving the camshaft 40 is described, the valve timing controller 10 analyzes a signal input from a sensor that detects the engine rotational speed to perceive the phase angle of the camshaft 40 during the low speed rotation of the engine. The valve timing variable control signal is generated.

When the preset valve timing variable control signal (perception control signal) is supplied from the valve timing control unit 10 to the oil control driving unit 20, the spool valve 26 moves to the right and the oil flowing from the oil pump 60 is oil. It is supplied to the crust hole 22 through the supply hole 23 of the control driver 20.

The flow of oil is then directed to the crust chamber 52 of the vane housing 50 through the crust passage 32 of the cylinder head 30 and the crust oil hole 42 of the camshaft 40, which are connected to the crust hole 22. Supplied.

According to the pressure of the oil supplied to the crust chamber 52 of the vane housing 50, the hydraulic pressure is added to the crust chamber 52, and the rotor 43 integral with the cam shaft 40 rotates in the crust direction.

As described above, in the vane-type continuous variable valve timing apparatus of the vehicle according to the exemplary embodiment of the present invention, oil supplied to the advance passage and the perceptual passage through the oil control driving unit 20 according to the rotational state of the engine is the cylinder head 30. The valve timing is advanced / retarded as it is supplied to the advance chamber 51 and the perception chamber 52 located in the vane housing 50 through the cam shaft 40).

As described above, the vane-type continuous variable valve timing apparatus of the vehicle according to the present invention reduces the response time of the valve timing by advancing or perceiving the phase of the camshaft more quickly and accurately according to the rotational speed of the engine. There is an effect that can maximize the output efficiency of the engine.

Claims (5)

In the vane type continuous variable valve timing apparatus of a vehicle, A valve timing controller configured to generate a valve timing variable control signal preset according to the engine rotation speed of the vehicle; It has an advance hole and a perception hole, and the flow of oil supplied and discharged through the advance hole and the perception hole to form a corresponding advance passage and the perception passage in accordance with the input of the variable valve timing control signal supplied from the valve timing control unit An oil control drive for converting; A cylinder head in which an advance passage and a perception passage are respectively formed for supplying and discharging oil supplied through the advance hole and the perception hole of the oil control drive in a state where the oil control drive is mounted; A camshaft having an advance oil hole and a perceptual oil hole respectively connected to the advance passage and the perceptual passage formed in the cylinder head in a state of being mounted to the cylinder head; It has an Advance Chamber and a Retard Chamber respectively connected to the Advance Oil Hole and the Crust Oil Hole of the camshaft, and vary the phase of the camshaft according to the difference in the oil pressure supplied to the advance chamber and the perceptual chamber. A vane type continuous variable valve timing apparatus for a vehicle comprising a vane housing. The oil control driving unit of claim 1, wherein the oil control driving unit supplies a supply hole into which oil supplied from an oil pump is introduced, and oil circulated through the advance hole and the perception hole on both sides of the supply hole is returned to the oil storage unit. A vane type continuous variable valve timing apparatus for a vehicle, further comprising a discharge hole. The method of claim 1, wherein the deep oil hole and the earth oil hole formed in the camshaft are formed to be spaced apart at a predetermined interval in the longitudinal direction of each other, the length of the crust oil hole is formed longer than the length of the full oil hole. A vane type continuous variable valve timing device for a vehicle. The vane type continuous variable valve timing apparatus of claim 3, wherein the camshaft includes a rotor having at least one vane coupled to an outer circumferential surface of one end thereof. The rotor of the camshaft of claim 1, wherein the vane housing has a sprocket formed on an outer circumferential surface of the vane housing so as to be interlocked with the engine rotation of the vehicle, and has a vane arm that defines the movement of the vane on an inner circumferential surface of the vane housing. And the vane-type continuous variable valve of the vehicle, wherein the vane arm forms an advance chamber and a retard chamber respectively connected to the advance oil hole and the perceptual oil hole of the camshaft. Timing device.