KR101945279B1 - Camless type valve actuator of engine - Google Patents

Abstract

The present invention relates to a camless type valve driving apparatus for an engine that precisely controls the operation of a valve in accordance with a driving condition of a vehicle by using a camless type electronic valve driving apparatus using a motor, And a gear module provided inside the rotor and configured to open and close the valve by converting the rotational motion of the rotor into a linear reciprocating motion, and a gear for converting a rotational motion into a linear reciprocating motion inside the motor module, A module is provided to remove the camshaft drive system component, and the valve can be opened and closed electronically.

Description

[0001] The present invention relates to a camless type valve driving apparatus for an engine,

The present invention relates to a camless type valve driving apparatus for an engine, and more particularly, to a camless type valve driving apparatus for an engine that drives a valve provided in an engine of a vehicle in a camless type.

A valve mechanism applied to an automobile engine supplies a mixer to the combustion chamber and discharges the combustion gas according to the stroke of the engine.

In recent years, variable valve mechanisms have been developed to optimize the mixture flow rate and the combustion gas discharge efficiency by varying the valve opening rate and opening / closing timing according to the operating conditions of the engine, i.e., the rotational speed of the engine and the operating range of the engine And is being applied to the engine.

Accordingly, variable valve mechanisms for automobile engines can improve engine performance such as fuel economy, torque, output, etc. of the engine and reduce the amount of exhaust gas.

Such a variable valve mechanism for an automobile engine includes a variable valve timing mechanism for varying the opening and closing timing of the valve, a variable valve lift mechanism for varying the opening amount of the valve, and a variable valve operating angle mechanism for changing the valve operating angle.

In the conventional valve driving apparatus, hydraulic pressure is used to stop the valve. However, the structure of the valve lift mechanism is complicated and workability is deteriorated. When the hydraulic pressure is used, the operating oil pressure changes due to the viscosity of the operating oil being sensitive to temperature Accordingly, a malfunction of the variable valve lift mechanism occurs, and the accuracy of valve lift amount adjustment is deteriorated.

In order to solve such a problem, the present applicant has proposed a method of controlling a cylinder in a low-speed, low-load state of an engine and the like in the following Patent Document 1 and Patent Document 2, And variable speed control of the low speed mode to improve the efficiency of the engine.

Recently, a camless engine has been developed in which the configuration of a camshaft for driving an actuator provided in each cylinder of an engine is removed, and a conventional camshaft drive system component is replaced with a motor so as to directly open and close the valve.

For example, Patent Document 3 described below discloses an electromagnetic actuator technology applied to a camless engine.

Patent Document 3 describes an electromagnetic actuator that performs a linear reciprocating motion of a push rod connected to an armature by using electromagnets having different magnetic forces, and a control method of an internal combustion engine valve using the electromagnet.

Korean Patent Registration No. 10-1465635 (Announcement on Nov. 27, 2014) Korean Patent Registration No. 10-1465636 (Announcement on Nov. 27, 2014) Korea Patent Registration No. 10-1291416 (issued on August 7, 2013)

As described above, in the internal combustion engine according to the related art, since the crankshaft power is transmitted to the camshaft and the valve is opened and closed, the camshaft drive system parts such as the timing chain, cam, camshaft, .

As a result, the valve driving apparatus according to the related art has a problem that the weight of the vehicle increases due to the components of the camshaft driving system, and the manufacturing cost increases.

In addition, since the valve driving apparatus according to the related art controls the lifting and opening time of the valve through the cam lobe shape, there is a problem that the designing process of the cam lobe shape is complex and precise control is difficult.

In addition, in Patent Document 3, there is a problem in that when the magnetic force deviates between the two electromagnets, the operation of the valve, that is, the valve lifting time, opening time and opening /

Therefore, it is required to develop a technique for precisely controlling the valve operation by applying a camless type electromagnetic valve driving device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a camless type valve drive apparatus for an engine which precisely controls the operation of a valve in accordance with an operating condition of a vehicle, And to provide a driving apparatus.

It is another object of the present invention to provide a camless type valve driving apparatus for an engine which can independently control valves of respective cylinders by directly driving the valves using a motor without applying a separate transmission medium.

In order to achieve the above object, a camless type valve driving apparatus for an engine according to the present invention comprises a motor module for receiving a power and rotating the internal rotor in normal and reverse directions, and a motor module provided inside the rotor, And a gear module for converting the valve into a reciprocating motion and opening and closing the valve.

Wherein the motor module includes a housing forming an outer shape, a stator provided inside the housing to generate an electromagnetic force when a current is applied thereto, and a rotor provided inside the stator and rotated by an electromagnetic force generated in the stator, The rotor includes a casing formed in a cylindrical shape and a plurality of permanent magnets provided on an outer peripheral surface of the casing.

A pair of bearings are provided respectively at the upper and lower ends of the stator and the pair of bearings provide a degree of freedom of rotation of the planetary gear and the ring gear of the gear module, do.

Wherein the gear module includes a pair of ring gears respectively provided at the upper and lower ends of a space inside the casing of the stator, a plurality of planetary gears in contact with the pair of ring gears, And a shaft that moves up and down while rotating by the rotation of the planetary gear.

And the shaft is installed so as to be in direct contact with the coaxial upper end of the intake or exhaust valve, thereby opening and closing the valve by elevating and lowering the valve.

Wherein a plurality of first teeth are formed along the vertical direction on the inner circumferential surface of the pair of ring gears, the first teeth are engaged with a plurality of second teeth formed on the upper and lower ends of the plurality of planetary gears along the vertical direction, A first screw thread is formed on each of the plurality of planetary gears in a spiral shape and the first screw thread is engaged with a third screw thread formed on the inner circumferential surface of the casing in a spiral shape, .

And a plurality of third teeth are formed on the outer peripheral surface of the upper end and the lower end of the shaft along a vertical direction so as to engage with the second teeth formed on the plurality of planetary gears.

As described above, according to the camless type valve drive device of the engine of the present invention, the gear module for converting the rotational motion into the linear reciprocating motion is provided inside the motor module to remove the components of the camshaft drive system, It is possible to obtain an effect that it can be operated.

According to the present invention, by applying the decelerating function of the gear module to decelerate the rotation speed of the shaft to open and close the valve, it is possible to precisely control the valve lifting, opening degree and opening time.

Further, according to the present invention, the efficiency of power transmission and valve driving can be improved by opening and closing the valve by bringing the shaft into direct contact with the valve top.

In addition, according to the present invention, it is possible to independently control the motor driving the valves of the cylinders in accordance with the driving conditions of the vehicle, and to achieve an optimum state by controlling the valve lifting and opening information and the opening timing .

As a result, according to the present invention, it is possible to solve the complexity of the cam lobe shape design in the conventional internal combustion engine, the limitation of the engine speed and the valve drive for achieving the optimum efficiency, and the limitation of the variable mechanism mounting structure.

1 is a perspective view of a camless type valve drive apparatus for an engine according to a preferred embodiment of the present invention,
FIG. 2 is an exploded perspective view of the valve driving apparatus shown in FIG. 1,
Fig. 3 is an enlarged view of the gear module shown in Fig. 2,
4 is a sectional view taken along the line A-A 'shown in Fig. 1,
5 is a sectional view taken along the line B-B 'shown in Fig.

Hereinafter, a camless type valve driving apparatus for an engine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a camless type valve driving apparatus for an engine according to a preferred embodiment of the present invention, and FIG. 2 is an exploded perspective view of the valve driving apparatus shown in FIG.

Hereinafter, terms indicating directions such as 'left', 'right', 'forward', 'rearward', 'upward' and 'downward' are defined as indicating respective directions based on the states shown in the respective drawings do.

1 and 2, a camless type valve driving apparatus 10 for an engine according to a preferred embodiment of the present invention includes a motor module 20 that receives power and rotates an internal rotor 23 in normal and reverse directions, And a gear module 30 which is provided inside the rotor 23 and converts the rotational motion of the rotor 23 into a linear reciprocating motion to open and close the valve 11.

Here, the camless type valve drive device 10 of the engine is installed in direct contact with the coaxial upper surface of the intake and exhaust valves. A spring 12 is provided on the outer circumferential surface of each valve 11 to provide a restoring force for moving the valve 11 upward to return the valve 11 downward.

Next, the configuration of the motor module and the gear module will be described in detail with reference to FIGS. 2 to 5. FIG.

3 is an enlarged view of the gear module shown in FIG. 2, FIG. 4 is a sectional view taken along the line A-A 'shown in FIG. 1, and FIG. 5 is a sectional view taken along line B-B' .

2, 4 and 5, the motor module 20 includes a housing 21 that forms an outer shape, a stator 22 that is provided inside the housing 21 and generates an electromagnetic force when a current is applied thereto, And a rotor 23 provided inside the stator 22 and rotating by an electromagnetic force generated by the stator 22.

The housing 21 is formed in a substantially cylindrical shape and an installation space for installing the stator 22, the rotor 23, and the gear module 30 may be provided in the housing 21.

The stator 22 includes a bobbin 24 formed in a substantially cylindrical shape and a coil 25 wound on a plurality of teeth formed on an inner circumferential surface of the bobbin 24 a plurality of times, An electromagnetic force for rotating the rotor 23 in the forward and reverse directions is generated.

The rotor 23 may include a casing 26 formed in a substantially cylindrical shape and a plurality of permanent magnets 27 provided on the outer circumferential surface of the casing 26.

Thus, the rotor 23 rotates in the forward direction or the reverse direction according to the electromagnetic force generated in the stator 22 and the direction of the magnetic field of the permanent magnet 27.

A pair of bearings 28 are provided at upper and lower ends of the stator 22 so that the inner rotor 23 can rotate smoothly. 29). ≪ / RTI >

The pair of bearings 28 functions to maintain the rotation axis of the gear module 30 equally by providing only the degree of freedom of rotation of the planetary gear 32 and the ring gear 31 of the gear module 30 to be described below .

3 to 5, the gear module 30 includes a pair of ring gears 31, a pair of ring gears 31, and a pair of ring gears 31, which are installed at the upper and lower ends of the inner space of the casing 26, And a shaft 33 which is in contact with a plurality of planetary gears 32 and a plurality of planet gears 32 which are in contact with each other and that is moved up and down by rotation of the ring gear 31 and the planetary gear 32.

A plurality of first teeth 34 are formed along the vertical direction on the inner circumferential surface of each ring gear 31. The first teeth 34 are vertically arranged at the upper and lower ends of the respective planetary gears 32 And is engaged with a plurality of second teeth 35 formed in accordance with the present invention.

A first screw thread 36 is formed in a spiral shape at the center of each planet gear 32 and the first screw thread 36 is engaged with a second screw thread 37 formed in a spiral shape on the outer peripheral surface of the central portion of the shaft 33 . The first thread 36 also engages with a third thread 261 formed in a helical shape on the inner circumferential surface of the casing 26.

The planetary gear 32 is configured so that the first screw thread 36 is engaged with the second screw thread 37 of the shaft 33 and the third screw thread 261 of the casing 26, And the shaft 33 can be linearly reciprocated along the vertical direction while being rotated by the rotational motion of the planetary gear 32. [

That is, the shaft 33 functions as a sun gear of the planetary gear assembly, and a plurality of gears 32 are arranged on the outer peripheral surface of the upper end and the lower end of the shaft 33 along the up and down direction so as to engage with the second teeth 35 of the respective planetary gears 32. [ 3 teeth 38 may be formed.

The ring gear 31 and the planetary gear 32 are sequentially rotated by the rotation of the rotor 23 and the shaft 33 is rotated by the second screw thread 37 in the planetary gears 32 and the first screw threads 36 formed on the first and second screw threads 32, 32, so that they can move upward or downward while rotating in the forward or reverse direction.

As described above, according to the present invention, the gear module for converting the rotational motion into the linear reciprocating motion is provided in the motor module to remove the components of the camshaft drive system and to open and close the valve electronically.

Further, according to the present invention, since the rotation speed of the rotor is reduced by using the gear module to open and close the valve, the head, opening degree and opening time of the valve can be precisely controlled.

Next, a coupling relationship and an operation method of a camless type valve driving apparatus for an engine according to a preferred embodiment of the present invention will be described in detail.

First, the operator places a plurality of planetary gears 32 on the outside of the shaft 33 so that the second screw threads 37 and the first screw threads 36 mesh with each other, and the upper and lower ends of the plurality of planetary gears 32 And the gear module 30 is assembled by inserting it into the casing 26 of the rotor 23 in a state where a pair of ring gears 31 are disposed outside.

At this time, the first thread 36 of the planetary gear 32 is assembled with the second thread 37 of the shaft 33 and the third thread 261 of the casing 26, respectively.

The worker assembles the rotor 23 by disposing a plurality of permanent magnets 27 on the outer circumferential surface of the casing 26 and assembles the assembled rotor 23 to the bobbin 24, And then the stator 22 and the rotor 23 are inserted into the housing 21 to assemble the motor module 20.

When a current is applied to the coil 25 through the connector 29 after the assembling of the camless type valve driving device of the engine is completed through the above process, a magnetic field is induced in the coil 25 and an electromagnetic force is generated.

At this time, the direction of the electromagnetic force is determined according to the direction of the current flowing in the coil 25, and the rotor 23 is rotated in the forward direction (the forward direction) in accordance with the direction of the electromagnetic force of the stator 22 and the direction of the magnetic field by the permanent magnet 27 of the rotor 23 Or in the reverse direction.

The ring gear 31 of the gear module 30 provided inside the rotor 23 rotates at the same speed together with the casing 26 and the permanent magnet 27.

For example, when the ring gear 31 rotates along the direction C shown in Fig. 3, the plurality of planet gears 32 revolve and rotate in the same direction as the rotation direction of the ring gear 31. [

The shaft 33 provided in the plurality of planetary gears 32 rotates by receiving the rotational force through the third teeth 38 engaged with the second teeth 35 of the respective planetary gears 32.

At this time, since the second screw thread 37 is engaged with the first screw thread 36, the shaft 32 rotates at a reduced speed relative to the rotational speeds of the ring gear 31 and the planetary gear 32, Can operate.

Through the above-described process, the present invention provides a gear module for converting the rotational motion into the linear reciprocating motion in the motor module, thereby removing the components of the camshaft driving system and electronically opening and closing the valve.

Further, according to the present invention, the deceleration function of the gear module is applied to decelerate the rotation speed of the shaft to open and close the valve, thereby precisely controlling the valve lifting, opening degree and opening time.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a camless type valve drive device of an engine that opens and closes a valve electronically by providing a gear module for converting a rotational motion into a linear reciprocating motion in a motor module.

10: Cameless type valve drive unit of engine
11: valve 12: spring
20: motor module 21: housing
22: stator 23: rotor
24: bobbin 25: coil
26: casing 27: permanent magnet
28: Bearing 29: Connector
30: gear module 31: ring gear
32: planetary gear 33: shaft
34, 35, 38:
36, 37: First and second threads

Claims (7)

A camless type that removes a camshaft drive system component including a cam that transmits a rotational force of the engine and is disposed in direct contact with the coaxial upper surface of the intake and exhaust valves of the engine to open and close the intake and exhaust valves of the engine using the rotational force of the motor In the electronic valve drive apparatus of the present invention,
A motor module for receiving and rotating the internal rotor
And a gear module provided in the rotor and converting the rotational motion of the rotor into a linear reciprocating motion to open and close the valve,
The gear module includes a pair of ring gears installed at the upper and lower ends of the casing inner space of the stator provided in the motor module,
A plurality of planetary gears in contact with the pair of ring gears and
And a shaft which is in contact with the plurality of planetary gears and is operated to move up and down by rotation of the ring gear and the planetary gear,
Wherein the shaft is raised or lowered while rotating at a reduced speed as compared with the pair of ring gears and the plurality of planetary gears to open and close the valve by lifting and lowering the valve. The method according to claim 1,
The motor module includes a housing forming an outer shape,
A stator that is provided inside the housing and generates an electromagnetic force upon receiving a current;
And a rotor provided inside the stator and rotated by an electromagnetic force generated by the stator,
The rotor includes a casing formed in a cylindrical shape
And a plurality of permanent magnets provided on an outer circumferential surface of the casing. 3. The method of claim 2,
A pair of bearings are respectively installed at the upper and lower ends of the stator,
Wherein the pair of bearings provide a degree of freedom of rotation of the planetary gear and the ring gear of the gear module to maintain the rotation axis of the gear module to be the same. delete delete 4. The method according to any one of claims 1 to 3,
Wherein a plurality of first teeth are formed on the inner peripheral surface of the pair of ring gears along the vertical direction,
The first gear is engaged with a plurality of second gears formed on the upper and lower ends of each of the plurality of planetary gears along the vertical direction,
A first screw thread is formed in a spiral shape on each of the plurality of planetary gears, the first screw thread has a second screw thread formed in a spiral shape on an outer circumferential surface of a central portion of the shaft, a third screw thread formed in a spiral shape on an inner circumferential surface of the casing, And the camshaft is engaged with the camshaft. The method according to claim 6,
Wherein a plurality of third teeth are formed on the outer peripheral surface of the upper end and the lower end of the shaft along a vertical direction so as to engage with the second teeth formed on the plurality of planetary gears.

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