KR20120063122A - Variable valve lift apparatus - Google Patents

Abstract

PURPOSE: A variable valve lift apparatus is provided to improve the reliability of operation by stabilizing a behavior of a spring with preventing abrasion in the spring. CONSTITUTION: A variable valve lift apparatus comprises outer and inner tappet bodies, a latching unit(30), a spring plate, a lost motion spring and a valve. The outer and inner tappet bodies comprise outer and inner tappet guide holes. The latching unit is installed inside the inner tappet body guide hole, and selectively inserted into the outer tappet body guide hole. The spring plate is coupled to the inner tappet body. The lost motion spring elastically supports the outer tappet body. The valve is coupled to the inner tappet body. The latching unit comprises a latching pin(32), a retainer(36), a spring guide unit(38), and a latching pin spring(44). The retainer is inserted into a movable hole(34) of the latching pin, and coupled to the inner tappet body. The spring guide unit is coupled to the retainer. The latching pin spring is coupled to the spring guide unit, and elastically supports the latching pin.

Description

Variable valve lift device {VARIABLE VALVE LIFT APPARATUS}

The present invention relates to a variable valve lift apparatus, and more particularly, to a variable valve lift apparatus capable of varying the lift amount of the valve in accordance with the operating state of the engine.

An internal combustion engine generates fuel by receiving fuel and air in a combustion chamber and burning it. When inhaling air, intake valves are operated by driving a camshaft, and air is sucked into the combustion chamber while the intake valve is open. In addition, the exhaust valve is operated by the camshaft and air is discharged from the combustion chamber while the exhaust valve is open.

However, the optimum intake valve / exhaust valve operation depends on the rotational speed of the engine. That is, an appropriate lift or valve opening / closing time varies depending on the rotational speed of the engine. In order to implement a proper valve operation according to the rotational speed of the engine, a variable valve lift for designing a plurality of cams for driving the valve, or to operate the valve in accordance with the engine rotational speed different lift (lift) ( Variable valve lift (VVL) devices are being studied.

In the variable valve lift apparatus, power loss is preferably minimized in the process of driving the valve using the rotational force of the camshaft.

Such a variable valve lift device uses a spring and a retainer for coupling and releasing tappets, but there is a problem in that wear occurs between each member.

In addition, there is a problem that the spring behavior is unstable at the time of compression / tension of the spring, and thus the latching pin operation reliability is inferior.

Therefore, the present invention has been created to solve the above problems, the object of the present invention is to suppress the occurrence of wear of the spring and retainer for coupling and release of the tappet, etc., and stable spring behavior during compression / tension of the spring This is to provide a variable valve lift device that is guaranteed.

Variable valve lift apparatus according to a first embodiment of the present invention for achieving the above object is an outer tappet body formed with an outer tappet body guide hole; An inner tappet body having an inner tappet body guide hole formed therein and slidably provided in the outer tappet body; A latching portion provided in the inner tappet body guide hole and selectively inserted into the outer tappet body guide hole; A spring plate coupled to the inner tappet body; A lost motion spring provided between the spring plate and the outer tappet body to elastically support the outer tappet body; And a valve coupled to the inner tappet body, wherein the latching part comprises: a latching pin having a moving hole formed in a length direction thereof; A retainer inserted into the moving hole and engaging with the inner tappet body; A spring guide coupled with the retainer; And a latching pin spring provided in the latching pin and coupled to the spring guide to elastically support the latching pin.

The variable valve lift apparatus includes a hydraulic chamber formed in the outer tappet body guide hole to selectively supply hydraulic pressure; And a control pin for selectively pushing the latching portion according to the hydraulic pressure supply from the hydraulic chamber.

The spring guide may include an insertion hole formed to insert the retainer.

The spring guide may further include a spring insertion protrusion protruding to fit the latching pin spring.

In the variable valve lift apparatus according to the second embodiment of the present invention, a first contact portion is formed, a valve is provided at one end thereof, a guide hole is formed therein, and the other end thereof is supported by a hydraulic clearance adjusting device, and a rotating shaft An inner swing arm body that pivots about the inner swing arm; An outer swing arm body having a second contact portion protruding from the first contact portion, pivoting about the rotation shaft, and protruding a lift protrusion; A latching portion provided in the guide hole and selectively protruding to support the lift protrusion; And a lost motion spring elastically supporting the outer swing arm body, wherein the latching portion comprises: a latching pin having a moving hole formed in a length direction thereof; A retainer inserted into the moving hole and engaging with the inner swing arm body; A spring guide coupled with the retainer; And a latching pin spring provided in the latching pin and coupled to the spring guide to elastically support the latching pin.

The variable valve lift apparatus may include a flow path formed to supply hydraulic pressure from the hydraulic clearance adjusting device to the latching pin.

The spring guide may include an insertion hole formed to insert the retainer.

The spring guide may further include a spring insertion protrusion protruding to fit the latching pin spring.

In the variable valve lift apparatus according to the third exemplary embodiment of the present invention, the first contact portion is formed, a valve is provided at one end thereof, a guide hole is formed therein, and an inner pivot pivoting around the rocker arm shaft. Rocker arm body; An outer rocker arm body having a second contact portion protruding from the first contact portion, being pivotally movable around the rocker arm shaft, and having a lift protrusion protruding from the outer rocker arm body; A latching portion provided in the guide hole and selectively protruding to support the lift protrusion; And a lost motion spring elastically supporting the outer rocker arm body, wherein the latching portion comprises: a latching pin having a moving hole formed in a length direction thereof; A retainer inserted into the moving hole and engaging with the inner rocker arm body; A spring guide coupled with the retainer; And a latching pin spring provided in the latching pin and coupled to the retainer to elastically support the latching pin.

The variable valve lift apparatus may include a flow path configured to supply hydraulic pressure from the rocker arm shaft to the latching pin.

The spring guide may include an insertion hole formed to insert the retainer.

The spring guide may further include a spring insertion protrusion protruding to fit the latching pin spring.

According to the variable valve lift apparatus according to the embodiment of the present invention as described above, it is possible to adjust the valve lift amount according to the operating state of the engine with a simple configuration.

It is possible to prevent the wear of the spring during the axial movement of the latching pin, and to stabilize the spring behavior to increase the operating reliability.

1 is a cross-sectional view of a variable valve lift apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view of the latching portion of the variable valve lift apparatus according to the first embodiment of the present invention.
3 is a cross-sectional view taken along line III-III of FIG.
4 is a partial perspective view of the latching portion of the variable valve lift apparatus according to the first embodiment of the present invention.
5 is a perspective view of a variable valve lift apparatus according to a second embodiment of the present invention.
6 is a cross-sectional view of the latching portion of the variable valve lift apparatus according to the second embodiment of the present invention.
7 is a perspective view of a variable valve lift apparatus according to a third embodiment of the present invention.
8 is a cross-sectional view of the latching portion of the variable valve lift apparatus according to the third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a variable valve lift apparatus according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a latching portion of a variable valve lift apparatus according to a first embodiment of the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2, and FIG. 4 is a partial perspective view of the latching portion of the variable valve lift apparatus according to the first embodiment of the present invention.

1 to 4, the variable valve lift apparatus according to the first embodiment of the present invention includes an outer tappet body 10 having an outer tappet body guide hole 12; An inner tappet body 20 having an inner tappet body guide hole 22 formed therein and slidably provided in the outer tappet body 10; A latching part 30 provided in the inner tappet body guide hole 22 and selectively inserted into the outer tappet body guide hole 12; A spring plate 50 coupled to the inner tappet body 20; A lost motion spring (60) provided between the spring plate (50) and the outer tappet body (10) to elastically support the outer tappet body (10); And a valve 70 coupled to the inner tappet body 20.

The latching part 60 includes a latching pin 32 in which a moving hole 34 is formed in its length direction; A retainer 36 inserted into the moving hole 34 and engaged with the inner tappet body 20; A spring guide 38 coupled with the retainer 36; And a latching pin spring 44 provided in the latching pin 32 and coupled to the spring guide 38 to elastically support the latching pin 32.

The variable valve lift apparatus includes a hydraulic chamber 14 formed in the outer tappet body guide hole 12 to selectively supply hydraulic pressure; And a control pin 52 for selectively pushing the latching part 30 according to the hydraulic pressure supply from the hydraulic chamber 14.

The spring guide 38 includes an insertion hole 40 formed to insert the retainer 36.

The spring guide 38 further includes a spring insertion protrusion 42 formed to protrude so that the latching pin spring 44 is fitted.

1 to 4, the operation of the variable valve lift apparatus according to the embodiment of the present invention will be described. Optionally, the hydraulic pressure is controlled by the control of the ECU (engine control unit) from the hydraulic supply device (not shown). When supplied to 14, the control pin 52 pushes the latching pin 32 so that the latching pin 32 is positioned in the inner tappet body guide hole 22 and the outer tappet body guide hole 12. Thus, the inner tappet body 20 and the outer tappet body 10 are integrally reciprocated to open and close a general valve.

Here, the operation of the ECU can be implemented by those skilled in the art to which the present invention belongs, a detailed description thereof will be omitted.

When mode control is performed in the low lift mode according to the operating state of the engine, the hydraulic pressure supplied to the hydraulic chamber 14 is released.

Then, the latching pin 32 is positioned in the inner tappet body guide hole 22 by the elastic force of the latching pin spring 44, and the inner tappet body 20 and the outer tappet body 10 are separated. do.

That is, the outer tappet body 10 is in a lost motion movement, and the valve 70 is opened and closed by the reciprocating motion of the inner tappet body 20.

Here, the configuration and operation of the cam driving the inner tappet body 20 and the outer tappet body 10 can be implemented by those skilled in the art to which the present invention belongs, detailed description thereof will be omitted.

Here, since the retainer 36 is fixed and the latching pin 32 moves along the moving hole 34, the latching pin 32 may have a more stable behavior.

Here, since the latching pin spring 44 is fitted to the spring insertion protrusion 42, the latching pin spring 44 and the spring guide 38 is more firmly coupled.

In addition, when the latching pin spring 44 is compressed / relaxed, the spring guide portion 38 guides the operation of the latching pin spring 44 to increase the reliability of the support and the behavior thereof. Is increased.

The spring guide 38 may also serve as a stopper that prevents damage due to impact when the latching pin 32 is excessively compressed.

Since both ends of the latching pin spring 44 are supported in parallel, it is structurally stable.

5 is a perspective view of a variable valve lift apparatus according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view of a latching portion of the variable valve lift apparatus according to a second embodiment of the present invention.

5 and 6, in the variable valve lift apparatus according to the second exemplary embodiment of the present invention, a first contact portion 212 is formed, a valve 230 is provided at one end thereof, and a guide hole 214 therein. An inner swing arm body 210 supported by the hydraulic clearance adjusting device 240 and pivoting about the rotary shaft 250; An outer swing arm body 220 in which a second contact portion 222 protruding from the first contact portion 212 is formed, is pivotally movable around the rotation shaft 250, and a lift protrusion 224 is protruded. ); A latching part 260 provided in the guide hole 214 and selectively protruding to support the lift protrusion 224; And a lost motion spring 280 elastically supporting the outer swing arm body 220.

The latching part 260 may include a latching pin 262 having a moving hole 264 formed in a length direction thereof; A retainer 266 inserted into the movement hole 262 and engaged with the inner swing arm body 210; A spring guide 268 coupled to the retainer 266; And a latching pin spring 274 provided in the latching pin 262 and coupled to the spring guide part 268 to elastically support the latching pin 262.

The variable valve lift apparatus includes a flow path 290 formed to supply hydraulic pressure from the hydraulic clearance adjusting device 240 to the latching pin 62.

The spring guide part 268 includes an insertion hole 270 formed to insert the retainer 266.

The spring guide 268 further includes a spring insertion protrusion 272 protruding from the latching pin spring 274.

Referring to FIGS. 5 and 6, the operation of the variable valve lift apparatus according to the second exemplary embodiment of the present invention will be described. The cam 205 may contact the first contact portion 212 and the second contact portion 222. The valve 230 is opened and closed.

Here, the shape of the cam 205 and its operation principle are obvious to those skilled in the art to which the present invention pertains, and thus detailed description thereof will be omitted.

When the hydraulic pressure is supplied to the flow path 290, the latching pin 262 protrudes and the lift protrusion 224 is caught by the latching pin 262.

Therefore, the valve 230 is opened and closed depending on the movement of the outer swing arm body 220.

When the hydraulic pressure of the flow path 290 is released, the latching pin 262 is moved into the guide hole 214 by the elastic force of the latching pin spring 274, so that the lift protrusion 224 and the latching pin ( 262 is separated.

Accordingly, the outer swing arm body 220 is lost motion, and the valve 230 is opened and closed depending on the movement of the inner swing arm body 210.

Here, since the retainer 266 is fixed and the latching pin 262 moves along the moving hole 264, the behavior of the latching pin 262 may be more stable.

Here, since the latching pin spring 274 is fitted to the spring insertion protrusion 272, the latching pin spring 274 and the spring guide 268 is more firmly coupled.

In addition, when the latching pin spring 274 is compressed / relaxed, the spring guide part 268 guides the operation of the latching pin spring 274 to increase the reliability of the support and the behavior thereof, thereby suppressing the occurrence of wear and the like. Is increased.

The spring guide 268 may also serve as a stopper to prevent damage due to impact when the latching pin 272 is excessively compressed.

Since both ends of the latching pin spring 274 are supported in parallel, it is structurally stable.

7 is a perspective view of a variable valve lift apparatus according to a third embodiment of the present invention, and FIG. 8 is a cross-sectional view of a latching part of the variable valve lift apparatus according to a third embodiment of the present invention.

7 and 8, in the variable valve lift apparatus according to the third exemplary embodiment of the present invention, a first contact portion 312 is formed, a valve 330 is provided at one end thereof, and a guide hole 314 therein. Inner rocker arm body 310 is formed, and pivoting about the rocker arm shaft (350); An outer rocker arm body having a second contact portion 322 protruding from the first contact portion 312, pivotally moving around the rocker arm shaft 350, and having a lift protrusion 324 protruding therefrom 320); A latching part 360 provided in the guide hole 314 and selectively protruding to support the lift protrusion 324; And a lost motion spring 380 elastically supporting the outer rocker arm body 320.

The latching part 360 may include a latching pin 362 having a moving hole 364 formed in a length direction thereof; A retainer 366 inserted into the moving hole 364 and engaging with the inner rocker arm body 310; A spring guide 368 coupled with the retainer 366; And a latching pin spring 374 provided in the latching pin 362 and elastically supporting the latching pin 362 in combination with the retainer 366.

The variable valve lift apparatus includes a flow path 390 configured to supply hydraulic pressure from the rocker arm shaft 350 to the latching pin 352.

The spring guide part 368 includes an insertion hole 370 in which the retainer 366 is inserted.

The spring guide 368 further includes a spring insertion protrusion 372 formed to protrude so that the latching pin spring 374 is fitted.

Referring to FIGS. 7 and 8, the operation of the variable valve lift apparatus according to the third exemplary embodiment of the present invention will be described. The high lift cam 301 and the low lift cam 302 may include the first contact portion 212 and the first agent. The valve 230 is opened and closed by contacting the two contact parts 222.

When the hydraulic pressure is supplied to the flow path 390, the latching pin 362 protrudes and the lift protrusion 324 is caught by the latching pin 362.

Accordingly, the valve 330 is opened and closed depending on the movement of the outer swing arm body 320.

When the hydraulic pressure of the flow path 390 is released, the latching pin 362 is moved into the guide hole 314 by the elastic force of the latching pin spring 374, so that the lift protrusion 324 and the latching pin ( 362) is separated.

Therefore, the outer swing arm body 320 is lost motion, and the valve 330 is opened and closed depending on the movement of the inner swing arm body 310.

Here, since the retainer 366 is fixed and the latching pin 362 moves along the moving hole 364, the behavior of the latching pin 362 may be more stable.

Here, since the latching pin spring 374 is fitted to the spring insertion protrusion 372, the latching pin spring 374 and the spring guide 368 is more firmly coupled.

In addition, when the latching pin spring 374 is compressed / relaxed, the spring guide portion 368 guides the latching pin spring 374 to increase the reliability and support of the latching pin spring 374. Is increased.

The spring guide 368 may also serve as a stopper that prevents damage due to impact when the latching pin 372 is excessively compressed.

Since both ends of the latching pin spring 374 are supported in parallel, it is structurally stable.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

10: outer tappet body 12: outer tappet body guide hole
14: hydraulic chamber 20: inner tappet body
22: inner tappet body guide hole 30: latching part
32: latching pin 34: moving hole
36: Retainer 38: Spring Guide
40: insertion hole 42: spring insertion protrusion
44: latching pin spring 50: spring plate
52: Control Pin 60: Lost Motion Spring
70: valve
205: cam 210: inner swing arm body
212: first contact portion 214: guide hole
220: outer swing arm body 222: second contact portion
224: lift projection 230: valve
240: hydraulic clearance adjusting device 250: rotary shaft
260: latching portion 262: latching pin
264: moving hole 266: retainer
268: spring guide 270: insertion hole
272: spring insertion projection 274: latching pin spring
280: lost motion spring 290: euro
301: high lift cam 302: low lift cam
310: inner rocker arm body 312: first contact portion
314: guide hole 320: outer rocker arm body
322: second contact portion 324: lift protrusion
330: valve 350: rocker arm shaft
360: latching part 362: latching pin
364: moving hole 366: retainer
368: spring guide 370: insertion hole
372: spring insertion protrusion 374: latching pin spring
380: lost motion spring 390: euro

Claims (12)

An outer tappet body having an outer tappet body guide hole formed therein;
An inner tappet body having an inner tappet body guide hole formed therein and slidably provided in the outer tappet body;
A latching portion provided in the inner tappet body guide hole and selectively inserted into the outer tappet body guide hole;
A spring plate coupled to the inner tappet body;
A lost motion spring provided between the spring plate and the outer tappet body to elastically support the outer tappet body; And
A valve coupled with the inner tappet body;
Including,
The latching portion
A latching pin having a moving hole formed in the longitudinal direction thereof;
A retainer inserted into the moving hole and engaging with the inner tappet body;
A spring guide coupled with the retainer; And
A latching pin spring provided in the latching pin and coupled to the spring guide to elastically support the latching pin;
Variable valve lift apparatus comprising a. In claim 1,
The variable valve lift device
A hydraulic chamber formed in the outer tappet body guide hole to selectively supply hydraulic pressure; And
A control pin for selectively pushing the latching portion according to the hydraulic pressure supply from the hydraulic chamber;
Variable valve lift apparatus further comprising a. In claim 1,
The spring guide portion
And an insertion hole formed to insert the retainer. 4. The method of claim 3,
The spring guide unit is a variable valve lift device, characterized in that further comprising a spring insertion protrusion protruding to be fitted with the latching pin spring. An inner swing arm body having a first contact portion, a valve provided at one end thereof, a guide hole formed therein, the other end supported by a hydraulic clearance adjusting device, and pivoting about a rotating shaft;
An outer swing arm body having a second contact portion protruding from the first contact portion, pivoting about the rotation shaft, and protruding a lift protrusion;
A latching portion provided in the guide hole and selectively protruding to support the lift protrusion; And
A lost motion spring elastically supporting the outer swing arm body;
Including,
The latching portion
A latching pin having a moving hole formed in the longitudinal direction thereof;
A retainer inserted into the moving hole and engaging with the inner swing arm body;
A spring guide coupled with the retainer; And
A latching pin spring provided in the latching pin and coupled to the spring guide to elastically support the latching pin;
Variable valve lift apparatus comprising a. The method of claim 5,
The variable valve lift device
And a flow path configured to supply hydraulic pressure from the hydraulic clearance adjusting device to the latching pin. The method of claim 5,
The spring guide portion
And an insertion hole formed to insert the retainer. In claim 7,
The spring guide unit is a variable valve lift device, characterized in that further comprising a spring insertion protrusion protruding to be fitted with the latching pin spring. An inner rocker arm body having a first contact portion, a valve at one end thereof, a guide hole formed therein, and pivoting about a rocker arm shaft;
An outer rocker arm body having a second contact portion protruding from the first contact portion, being pivotally movable around the rocker arm shaft, and having a lift protrusion protruding from the outer rocker arm body;
A latching portion provided in the guide hole and selectively protruding to support the lift protrusion; And
A lost motion spring elastically supporting the outer rocker arm body;
Including,
The latching portion
A latching pin having a moving hole formed in the longitudinal direction thereof;
A retainer inserted into the moving hole and engaging with the inner rocker arm body;
A spring guide coupled with the retainer; And
A latching pin spring provided in the latching pin and coupled to the retainer to elastically support the latching pin;
Variable valve lift apparatus comprising a. In claim 9,
The variable valve lift device
And a flow path configured to supply hydraulic pressure from the rocker arm shaft to the latching pin. In claim 9,
The spring guide portion
And an insertion hole formed to insert the retainer. In claim 9,
The spring guide unit is a variable valve lift device, characterized in that further comprising a spring insertion protrusion protruding to be fitted with the latching pin spring.

Images