KR101637310B1 - Variable valve lift apparatus - Google Patents

Variable valve lift apparatus Download PDF

Info

Publication number
KR101637310B1
KR101637310B1 KR1020150131192A KR20150131192A KR101637310B1 KR 101637310 B1 KR101637310 B1 KR 101637310B1 KR 1020150131192 A KR1020150131192 A KR 1020150131192A KR 20150131192 A KR20150131192 A KR 20150131192A KR 101637310 B1 KR101637310 B1 KR 101637310B1
Authority
KR
South Korea
Prior art keywords
outer body
inner body
cam
lost motion
space
Prior art date
Application number
KR1020150131192A
Other languages
Korean (ko)
Inventor
최명식
Original Assignee
현대자동차 주식회사
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 현대자동차 주식회사 filed Critical 현대자동차 주식회사
Priority to KR1020150131192A priority Critical patent/KR101637310B1/en
Application granted granted Critical
Publication of KR101637310B1 publication Critical patent/KR101637310B1/en

Links

Images

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
    • 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
    • F01L13/0021—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 by modification of rocker arm ratio
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F01L1/20—Adjusting or compensating clearance

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Disclosed is a variable valve lift device. According to an embodiment of the present invention, the variable valve lift device, operated to change a lift of a valve of an engine, includes: an outer body selectively performing level movement depending on the rotation of a cam, and forming a first space; an inner body placed in the first space, of which end is connected to an end of the outer body to be rotatable, and forming a second space; a cam contact part placed in the second space, connected to the inner body to be rotatable, and making contact with the cam to make the inner body perform the lever movement depending on the rotation of the cam; a connection shaft placed to penetrate an end of the outer body and an end of the inner body to connect the outer and inner bodies; a pallet installed at both ends of the connection shaft protruding from both sides of the outer body; and a lost motion spring installed at other end of the outer body, and providing elastic force to make the inner body perform lost motion movement. The inner body is selectively fixed to the outer body to perform the lever movement with the outer body around a lever movement rotation shaft of the outer body or the fixture is selectively released to perform the lever movement around the connection shaft.

Description

[0001] VARIABLE VALVE LIFT APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable valve lift apparatus, and more particularly, to a three-point supported variable valve lift apparatus supported by two valves and one hydraulic lash adjuster.

Generally, an internal combustion engine forms a power by burning the fuel and air received in the combustion chamber. Here, when the air is sucked, intake valves are actuated by driving a cam shaft, and air is sucked into the combustion chamber while the intake valve is opened. Further, when discharging the air, the exhaust valve is actuated by driving the camshaft, and the air is discharged from the combustion chamber while the exhaust valve is opened.

On the other hand, the optimum intake valve or exhaust valve operation depends on the rotational speed of the engine. That is, an appropriate lift or valve opening / closing timing is controlled according to the rotational speed of the engine. As described above, in order to realize an appropriate valve operation according to the rotation speed of the engine, a variable valve lift (VVL) device has been researched that implements the valve to operate with a different lift according to the number of revolutions of the engine . Examples of such variable valve lifting devices include a plurality of cams for driving the valve with different lifts on the camshaft, and a device operated to select a cam for driving the valve depending on the situation.

However, when a plurality of cams are provided on the camshaft, the configuration for selectively changing the cam for operating the intake valve or the exhaust valve becomes complicated, and interference between the components may occur. On the other hand, when operating each of the plurality of cams independently so as to prevent interference between the components, the cost can be raised by requiring a component for operation for each cam.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a variable valve lift apparatus capable of changing a valve lift with one cam.

It is another object of the present invention to provide a variable valve lift apparatus that prevents the movement of a pallet by mounting a pallet fixed to both ends of a connecting shaft connecting the inner body to the outer body through a fixed cap.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a variable valve lift apparatus for changing a lift of a valve provided in an engine, An outer body forming a space; An inner body disposed in the first space, one end rotatably connected to one end of the outer body and forming a second space; A cam contact portion disposed in the second space, the cam contact portion being rotatably connected to the inner body, the cam contact portion contacting the cam such that the inner body levers in accordance with rotation of the cam; A connection shaft arranged to penetrate through one end of the outer body and one end of the inner body and connect the outer body and the inner body; A pallet mounted on both ends of the connection shaft projected from both ends of the one end of the outer body; And a lost motion spring mounted on both sides of the other end of the outer body and providing an elastic force to move the inner body in a lost motion motion, wherein the inner body is selectively fixed to the outer body, The lever can be moved together with the outer body around the rotational axis of the motor, or the fixing with the outer body can be selectively released and the lever can be moved around the connecting shaft.

The pallet may be fixed on the connecting shaft via a fixing member mounted on an end of the connecting shaft.

The outer body may have an opening hole on both sides in the width direction, and the opening may have a rib corresponding to a shaft rotatably supporting the cam contact portion.

The rib may be formed by connecting upper and lower portions of the opening hole along a lever moving direction of the inner body, and a guide groove may be formed on an inner surface of the rib so that the shaft is inserted.

One end of the lost motion spring is fixed to the outer body and the other end is disposed on the outer periphery of the inner body so as to be supported by the shaft.

The lost motion spring may return the inner body relatively rotated with respect to the outer body around the connecting shaft.

The outer body may be integrally formed with a mounting end, into which the lost motion spring is inserted, on both sides of the other end.

The outer body may be integrally formed with a support end corresponding to one end of the lost motion spring.

As described above, according to the variable valve lifter according to the embodiment of the present invention, since the two valve lifts are changed in accordance with the movement of the cam contact portion contacting with one cam, the power loss due to friction with the cam can be minimized have.

Further, by only lever-moving the inner body together with the cam contact portion which is in contact with the cam, cylinder pause can be realized.

In addition, by fixing the pallet mounted on both ends of the connecting shaft connecting the inner body to the outer body through the fixing member, it is possible to prevent the pallet from coming off and reduce the assembly tolerance.

Further, by fixing the pallet to the connection shaft stably by the fixing member, it is possible to prevent the pallet from moving to the left and right, thereby improving the reliability of the valve operation.

Further, since the lost motion spring is disposed on both sides of the other end of the outer body, the overall length is shortened and the overall size of the variable valve lift apparatus is reduced, thereby reducing weight and cost, and improving space utilization and dynamic characteristics.

1 is a plan view of a variable valve lift apparatus according to an embodiment of the present invention.
2 is a partial perspective view of a variable valve lift apparatus according to an embodiment of the present invention.
3 is a side view of a variable valve lift apparatus according to an embodiment of the present invention.

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

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, It should be understood that various equivalents and modifications may be present.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

And throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", " unit of means ", " part of item ", " absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

FIG. 1 is a plan view of a variable valve lift apparatus according to an embodiment of the present invention, FIG. 2 is a partial perspective view of a variable valve lift apparatus according to an embodiment of the present invention, FIG. 3 is a perspective view of a variable valve lift apparatus according to an embodiment of the present invention, Side view of the device.

1 to 3, the variable valve lift apparatus according to the embodiment of the present invention includes an outer body 10, an inner body 20, a cam contact portion 30, a connecting shaft 40, a pallet 50 And a lost motion spring 60.

The outer body 10 selectively receives a rotational force of a cam shaft (not shown), performs a lever movement, and operates to open and close the valve. A cam (not shown) is formed on the cam shaft to convert the rotational motion of the cam shaft into a lever motion of the outer body 10.

Here, the valve is an intake valve or an exhaust valve of the engine. A first space 12 through which the outer body 10 is vertically penetrated is formed inside the outer body 10.

That is, the outer body 10 has a certain length and has a certain width and thickness so that the first space 12 of the outer body 10 is formed.

One end of the outer body 10 is connected to the valve through the connecting shaft 40, and the other end of the outer body 10 is provided with a lever motion rotary shaft.

In the following description, one end and the other end of the components provided in or connected to the outer body 10 refer to a part of the outer body 10 in the same direction as one end and the other end, respectively.

The inner body 20 is disposed in the first space 12 of the outer body 10. One end of the inner body 20 is rotatably connected to one end of the outer body 10.

The inner body 20 receives the rotational force of the camshaft, performs lever movement, and is operated to selectively open and close the valve. A second space (24) penetrating in the vertical direction is formed on the inner side of the inner body (20). That is, the inner body 20 has a certain length and has a certain width and thickness to allow the second space 24 of the inner body 20 to be formed.

The cam contact portion 30 is disposed in the second space 24. The cam contact portion 30 is rotatably connected to the inner body 20. Further, the cam contact portion 30 is in rolling contact with the cam so as to convert the rotational movement of the camshaft into the lever movement of the outer body 10 or the inner body 20

The cam contact portion 30 may be composed of a roller or a pad. That is, when the cam contact portion 30 is a roller, it is in rolling contact with the cam, and in the case of a pad, it is in sliding contact with the cam.

The connecting shaft 40 is rotatably connected to one end of the outer body 10 and one end of the inner body 20. That is, the inner body 20 may be rotated relative to the outer body 10 about the connection shaft 40. One end of the outer body 10 connected to the inner body 20 by the connecting shaft 40 is referred to as an outer connecting part 14 and the outer connecting part 14 is connected to the outer body 10 by the connecting shaft 40. [ One end of the inner body 20 is referred to as an inner connection portion 22.

The pallet 50 is mounted on both ends of the connection shaft 40 protruding in the width direction from both sides of one end of the outer body 10.

Here, the pawl 50 is formed with a projection 52 on its upper side to prevent rotation while contacting the upper part of the outer body 10 to prevent rotation.

A valve abutment portion 54 is formed on the lower side of the pallet 50. The valve contact portion 52 functions to push the valve according to the lever movement of the outer body 10 in contact with the valve or the valve opening / closing device provided to open or close the valve.

The pallet 50 may be fixed on the connecting shaft 40 through a fixing member 70 mounted on the end of the connecting shaft 40.

That is, the fixing member 70 prevents the pallet 50 from moving left and right by preventing the pallet 50 from being detached from the connecting shaft 40 and stably fixing the pallet 50, Can be improved.

The other end of the outer connection part 14 is provided with a seating part 17 on which a hydraulic lash adjuster (HLA) is mounted.

That is, the variable valve lift apparatus according to the embodiment of the present invention is a three-point supported variable valve lift apparatus supported by two valves and one hydraulic lash adjuster. Here, the hydraulic rack adjuster is a device for supplying the hydraulic pressure to operate the variable valve lift device and simultaneously moving the valve lifter in close contact with the cam, and the hydraulic lift adjuster is provided to a person having ordinary skill in the art So that detailed description thereof will be omitted.

When the inner body 20 is fixed to the outer body 10, the inner body 20 and the outer body 10 are rotated by the rotation of the cam in contact with the cam contact portion 30, 10) with respect to the rotational axis of the lever.

When the fixing of the inner body 20 fixed to the outer body 10 is released, only the inner body 20 is rotated by the rotation of the connecting shaft 40 ).

Herein, the fixing and releasing of the inner body 20 selectively fixed to the outer body 10 using a latching pin or the like is obvious to a person skilled in the art, and thus a detailed description thereof will be omitted.

On the other hand, in the outer body 10, as shown in Fig. 3, opening holes 11 are formed on both sides in the width direction. A rib 13 may be formed in the opening hole 11 in correspondence with a shaft 32 that rotatably supports the cam contact portion 30. [

The ribs 13 are formed by connecting the upper and lower portions of the opening hole 11 along the direction of lever movement of the inner body 20. The guide groove 19 may be formed on the inner surface of the rib 13 so that the shaft 32 is inserted.

The ribs 13 configured as described above can reinforce the structural rigidity of the outer body 10. The ribs 13 prevent axial flow of the shaft 32 and guide the lever movement of the inner body 20 through the guide groove 19 in a stable manner.

The lost motion spring 60 is installed on both sides of the other end of the outer body 10, and provides an elastic force to cause the inner body to perform a lost motion motion.

When the inner body 20 is fixed to the outer body 10, the lost motion spring 60 is rotated by the lever movement so that the inner body 20, which is relatively rotated with the outer body 10, .

Here, the outer body 10 is integrally formed with a mounting end 16 on both sides of the other end to which the lost motion spring 60 is inserted.

Accordingly, the lost motion spring 60 is mounted on the outer body 10 in a state of being fitted to the mounting end 16. An outer fixing part 52 fixed to the outer body 10 and an inner fixing part 54 fixed to the inner body 20 are formed on the lost motion spring 50. [

That is, the outer fixing part 62 of the lost motion spring 60 is fixed to the outer body 10. The inner fixing part 64 may be disposed on the outer periphery of the inner body 20 and may be supported by the shaft 32.

The outer end 10 of the outer body 10 may be integrally formed with the support end 18 corresponding to the outer fixed portion 62 of the lost motion spring 60.

Therefore, the outer fixing part 62 of the lost motion spring 60 can be fixed to the supporting end 18 of the outer body 10.

The lost motion spring 60 can be easily fixed to the inner body 20 and the lost motion spring 60 can be easily attached to the outer body 10 or the inner body 20, There is no need for a separate component for connection with the connector 20.

Accordingly, the variable valve lifter according to the embodiment of the present invention stably mounts the pallet 50 on the connecting shaft 40 through the fixing member 70, thereby reducing the overall width of the outer body 10, It is possible to prevent the pallet 50 from departing.

Therefore, when the variable valve lifting device according to the embodiment of the present invention as described above is applied, the two valve lifts are changed in accordance with the movement of the cam contacting portion 30 in contact with one cam, Can be minimized.

Further, only the inner body 20 levers with the cam contact portion 30 in contact with the cam, so that the cylinder stop can be realized.

It is also possible to prevent the pallet 50 from being separated by fixing the pallet 50 mounted on both ends of the connecting shaft 40 connecting the inner body 20 to the outer body 30 through the fixing member 70 , The assembly tolerance can be reduced.

The fixing member 70 stably fixes the pallet 50 to the connecting shaft 40 so that the pallet 50 can be prevented from moving to the left and right to improve the reliability of the valve operation.

Further, since the lost motion spring 60 is disposed on both sides of the other end of the outer body 10, the overall length is shortened and the overall size of the variable valve lifting device is reduced, thereby reducing weight and cost, Can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

10: outer body 11: opening hole
12: first space 13: rib
14: Outer connection part 15: Guide groove
16: Mounting end 17:
18: Supporting end 20: Inner body
22: inner connection part 24: second space
30: cam contact portion 32: shaft
40: connecting axis 50: pallet
52: Projection 60: Lost Motion Spring
62: Outer fixing portion 64: Inner fixing portion

Claims (8)

A variable valve lift apparatus operated to change a lift of a valve provided in an engine,
An outer body which selectively moves according to the rotation of the cam and forms a first space;
An inner body disposed in the first space, one end rotatably connected to one end of the outer body and forming a second space;
A cam contact portion disposed in the second space, the cam contact portion being rotatably connected to the inner body, the cam contact portion contacting the cam such that the inner body levers in accordance with rotation of the cam;
A connection shaft arranged to penetrate through one end of the outer body and one end of the inner body and connect the outer body and the inner body;
A pallet mounted on both ends of the connection shaft projected from both ends of the one end of the outer body; And
And a lost motion spring mounted on both sides of the other end of the outer body to provide an elastic force to cause the inner body to perform a lost motion movement,
The inner body is selectively fixed to the outer body so that the inner body is selectively moved with respect to the outer body about the rotation axis of the lever movement of the outer body, Wherein the variable valve lift device comprises: The method according to claim 1,
The pallet
Wherein the connecting shaft is fixed on the connecting shaft via a fixing member mounted on an end of the connecting shaft. The method according to claim 1,
The outer body
Wherein an opening hole is formed at both sides in the width direction, and a rib is formed in the opening hole to correspond to a shaft rotatably supporting the cam contact portion. The method of claim 3,
The rib
Wherein a guide groove is formed on an inner surface of the inner hole so as to connect upper and lower portions of the opening hole along the direction of the lever movement of the inner body, so that the shaft is inserted. The method of claim 3,
The lost motion spring
Wherein one end is fixed to the outer body and the other end is disposed on the outer periphery of the inner body and is supported on the shaft. The method according to claim 1,
The lost motion spring
And the inner body is rotated relative to the outer body around the connection shaft. The method according to claim 1,
The outer body
And a mounting end into which the lost motion spring is inserted is integrally formed on both sides of the other end portion. The method according to claim 1,
The outer body
And a support end corresponding to one end of the lost motion spring is integrally formed.
KR1020150131192A 2015-09-16 2015-09-16 Variable valve lift apparatus KR101637310B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150131192A KR101637310B1 (en) 2015-09-16 2015-09-16 Variable valve lift apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150131192A KR101637310B1 (en) 2015-09-16 2015-09-16 Variable valve lift apparatus

Publications (1)

Publication Number Publication Date
KR101637310B1 true KR101637310B1 (en) 2016-07-07

Family

ID=56500114

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150131192A KR101637310B1 (en) 2015-09-16 2015-09-16 Variable valve lift apparatus

Country Status (1)

Country Link
KR (1) KR101637310B1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080040693A (en) * 2005-08-05 2008-05-08 쉐플러 카게 Switchable cam follower of a valve train of an internal combustion engine
KR20090059392A (en) * 2007-12-06 2009-06-11 현대자동차주식회사 Rocker arm for variable valve lift, and variable valve lift apparatus having the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080040693A (en) * 2005-08-05 2008-05-08 쉐플러 카게 Switchable cam follower of a valve train of an internal combustion engine
KR20090059392A (en) * 2007-12-06 2009-06-11 현대자동차주식회사 Rocker arm for variable valve lift, and variable valve lift apparatus having the same

Similar Documents

Publication Publication Date Title
US9745873B2 (en) Multiple variable valve lift apparatus
RU2540344C1 (en) Ice timing valve control module
EP3029283B1 (en) Variable valve lift apparatus
KR101646136B1 (en) Variable valve lift apparatus
US9181820B2 (en) Valve mechanism for internal combustion engine and control device for valve mechanism
US9732641B2 (en) Variable valve mechanism of internal combustion engine
KR101209726B1 (en) Variable valve lift apparatus
JP2018519466A (en) Switching rocker arm for internal exhaust gas recirculation with simple latch control
KR101484235B1 (en) Variable valve lift appratus
JP6520909B2 (en) Variable valve mechanism of engine
KR101637310B1 (en) Variable valve lift apparatus
KR101090798B1 (en) Variable tappet
US8490587B2 (en) Cam drive
JP6574676B2 (en) Variable valve lift device
JP2014152642A (en) Rocker arm
KR20090124220A (en) Variable valve lift apparatus
JP6179348B2 (en) Valve mechanism and internal combustion engine
US9879571B2 (en) Valve mechanism for internal combustion engine
JP6502709B2 (en) Variable valve lift device
JP5724948B2 (en) Variable valve gear

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20190627

Year of fee payment: 4