KR101683527B1 - Engine having compresseion alleviation type engine brake fuction - Google Patents

Engine having compresseion alleviation type engine brake fuction Download PDF

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Publication number
KR101683527B1
KR101683527B1 KR1020150148271A KR20150148271A KR101683527B1 KR 101683527 B1 KR101683527 B1 KR 101683527B1 KR 1020150148271 A KR1020150148271 A KR 1020150148271A KR 20150148271 A KR20150148271 A KR 20150148271A KR 101683527 B1 KR101683527 B1 KR 101683527B1
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KR
South Korea
Prior art keywords
rocker arm
exhaust
gap
reset
engine
Prior art date
Application number
KR1020150148271A
Other languages
Korean (ko)
Inventor
이기라
Original Assignee
현대자동차 주식회사
기아자동차 주식회사
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Priority to KR1020150148271A priority Critical patent/KR101683527B1/en
Application granted granted Critical
Publication of KR101683527B1 publication Critical patent/KR101683527B1/en

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    • 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
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • 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
    • 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
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
    • 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
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

An engine having a compression-relieving engine brake function according to an embodiment of the present invention includes an exhaust rocker arm arranged to rotate about a rocker arm shaft, a gap adjusting screw fixed through a front end portion of the exhaust rocker arm, An exhaust valve that is lifted by a pressing force of the adjusting screw to open the exhaust port, and a gap adjusting unit that adjusts a gap between the exhaust valve by an oil pressure interposed between the gap adjusting screw and the exhaust valve A gap regulating portion disposed on one side of the gap regulating screw so as to be in contact with the distal end portion of the gap regulating screw and having a piston space opened to the other side from the center portion, A piston that adjusts the gap with the exhaust valve by an oil pressure to be applied to the piston, And a reset screw which is screwed through one side of the exhaust rocker arm and is arranged to press the reset bar according to the operation of the rocker arm .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an engine having a compression-relaxation type engine brake function,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine having a compression-relieving engine brake function that performs engine braking function by using compression and expansion energy of a piston to improve vehicle stability.

Generally, in large vehicles, auxiliary brakes are used to increase the durability of the brakes. For example, the auxiliary brake includes an engine brake (also referred to as a "jake brake") or an exhaust brake.

The exhaust brake has a structure for increasing the exhaust pressure by using a separate blocking portion for blocking the movement of the exhaust gas. The engine brake has a structure in which a separate driving portion is mounted on the exhaust valve to increase the pumping loss of the piston .

The engine brake and the exhaust brake as described above require a separate device and have a structure for electronically controlling the engine brake and the exhaust brake. Therefore, the layout of the engine becomes complicated and the weight of the engine or the vehicle increases.

Thus, a structure for improving the engine brake function by performing the engine brake function through the compression energy when the piston rises in the compression stroke in which both the intake valve and the exhaust valve are closed and opening the exhaust valve in the expansion stroke has been studied. Korean Patent Application No. 10-2009-0090262 is a prior art.

On the other hand, when the exhaust valve is opened at the correct timing between the compression stroke and the expansion stroke, the efficiency of the engine brake is increased, and the collision between the exhaust valve and the piston can be prevented.

An object of the present invention is to provide an engine having a function of opening a exhaust valve at a more accurate timing when an engine brake is operated and having a function of a compression relieving engine brake capable of preventing a collision between an exhaust valve and a piston .

As described above, the engine having the compression-relieving engine brake function according to the embodiment of the present invention includes the exhaust rocker arm arranged to rotate about the rocker arm shaft, the gap adjusting screw fixed through the front end of the exhaust rocker arm And an exhaust valve that is lifted by a pressing force of the gap adjusting screw to open the exhaust port, a gap for adjusting a gap between the exhaust valve by an oil pressure interposed between the gap adjusting screw and the exhaust valve, Wherein the gap regulating portion includes a socket having one side disposed in contact with a distal end portion of the gap adjusting screw and having a piston space opened to the other side from a center portion thereof and a socket inserted into the piston space to be in contact with a distal end portion of the exhaust valve A piston arranged to regulate the gap with the exhaust valve by a supplied oil pressure, A reset bar arranged to open and close a discharge port for discharging the hydraulic pressure supplied to the stone space to outside, and a reset screw which is threaded through one side of the exhaust rocker arm and is arranged to press the reset bar according to the operation of the rocker arm Screw.

The reset screw may further include a reset nut screwed to the exhaust rocker arm and screwed to the reset screw to fix the reset screw to the exhaust rocker arm.

The lower end of the gap adjusting screw may protrude in a hemispherical shape, and a hemispherical groove may be formed in the socket in correspondence with the hemispherical protrusion of the gap adjusting screw.

The hydraulic pressure can be supplied to the piston space through the rocker arm shaft, the exhaust rocker arm, the gap adjusting screw, and the socket.

The hydraulic pressure may further include a solenoid valve that passes through the cylinder head of the engine and is transmitted to the rocker arm shaft and the exhaust rocker arm and selectively controls the hydraulic pressure supplied to the rocker arm shaft to control the operation of the gap regulator .

An intake rocker arm disposed on the rocker arm shaft on one side of the exhaust rocker arm so as to press the intake valve and an injector rocker arm disposed on the rocker arm shaft on one side of the intake rocker arm to press and operate the injector .

The gap regulating portion is arranged to press the exhaust valve through a valve bridge, and the valve bridge can be arranged to press the two exhaust valves.

According to the present invention for achieving the above object, the reset plate mounted on the exhaust rocker arm can be converted into a reset screw type so that the reset screw can be more firmly secured to the exhaust rocker arm, and the reset screw can press the reset bar at the correct timing have.

Further, the position of the reset screw can be set more precisely through the fastening structure of the reset nut and the reset screw, the reset screw can be pressed at a more accurate timing, and the opening time of the exhaust valve can be more accurately controlled.

1 and 2 are partial perspective views of an engine having a compression-relaxation type engine brake function according to the present invention.
3 is a partial detailed sectional view of an engine having a compression-relaxation type engine brake function according to an embodiment of the present invention.
4 is a flowchart showing a part of the flow of hydraulic pressure in an engine having a compression-relieving engine brake function 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.

1 and 2 are partial perspective views of an engine having a compression-relaxation type engine brake function according to the present invention.

1, the engine includes a cam shaft 100, a solenoid valve 120, an intake rocker arm 140, an injector rocker arm 130, an exhaust rocker arm 150, a rocker arm shaft 110, A regulator 160, a gap regulator 180, a reset bar 170, a valve bridge 172, an intake valve 142, and an exhaust valve 152.

When the camshaft 100 rotates, the main cams formed on the camshaft 100 operate the intake rocker arm 140, the injector rocker arm 130, and the exhaust rocker arm 150, respectively. Here, the intake rocker arm 140, the injector rocker arm 130, and the exhaust rocker arm 150 are rotated by the rocker arm shaft 110 so that the intake valve 142, the injector (not shown) And the exhaust valve 152 are lifted.

The intake rocker arm 140 lifts two intake valves 142 through a valve bridge 172 and the exhaust rocker arm 150 lifts the two intake valves 142 through the gap regulating unit 180 and the valve bridge 172 The exhaust valves 152 are lifted.

The gap regulating unit 180 reduces the gap between the valve bridge 172 and the exhaust rocker arm 150 by using the hydraulic pressure supplied through the exhaust rocker arm 150 and relatively moves the exhaust rocker arm 150 150 so that the exhaust rocker arm 150 is brought into close contact with the outer circumferential surface of the camshaft 100.

In the embodiment of the present invention, when the engine brake is actuated, hydraulic pressure is supplied to the gap regulating portion 180, and the gap regulating portion 180 lifts the front end portion of the exhaust rocker arm 150, The arm 150 is operated by an engine brake projection (not shown) separately formed in the camshaft 100. [

Therefore, in the compression stroke, the exhaust valve 152 is kept closed to perform engine braking, and the exhaust valve 152 is opened at a point (changeable) about -10 degrees from the TDC reference. In the expansion stroke, To raise the engine brake function.

The exhaust rocker arm 150 is rotated by the rocker arm shaft 110 to rotate the exhaust valve 150. The exhaust rocker arm 150 is rotated by the exhaust cam And the reset plate 160 attached to the exhaust rocker arm 150 presses the reset bar 170 to release the hydraulic pressure generated in the gap regulating unit 180 to the outside.

2, the gap adjusting screw 200 is passed through from the upper part to the lower part and screwed to the tip of the exhaust rocker arm 150. The screw nut 206 is screwed into the upper end of the gap adjusting screw 200, So that the gap adjusting screw 200 is fixed to the exhaust rocker arm 150.

In addition, the screw nut 206 fixes the reset plate 160 to the gap adjusting screw 200 and the exhaust rocker arm 150.

The gap regulating unit 180 is disposed below the gap regulating screw 200. The gap regulating unit 180 includes a check plate 240, a check spring 235, a socket 225, a piston plug 230 A piston 220, a piston space 255, a reset plug 215, a hydraulic outlet 256, a reset bar 170, a reset spring 205, and a snap ring 210.

The upper end of the socket 225 has a semicircular groove and the lower end of the gap adjusting screw 200 has a semicircular shape that is seated in the semicircular groove.

In the socket 225, the piston space 255 is formed, and the piston space 255 is opened downward. The piston 220 is inserted into the piston space 255 from the bottom to the top and a check spring 235 for elastically supporting the piston 220 downward is disposed in the piston space 255, And the check plate 240 is disposed at the upper end of the guide plate 235.

Here, the check plate 240 prevents the hydraulic pressure supplied to the piston space 255 from flowing back to the gap adjusting screw 200 side.

A hydraulic pressure discharge port 256 for discharging the hydraulic pressure formed in the piston space 255 to the outside is formed at one side of the socket 225 and a reset bar 170 for opening and closing the hydraulic pressure discharge port 256 And is inserted into the socket 225 and fastened.

A reset spring 205 is disposed on the upper outer circumferential surface of the reset spring 205 and a snap ring 210 is disposed on the upper end of the reset spring 205 so that the reset spring 205 is not released to the outside.

The reset bar 170 is pulled upward by an elastic force of the reset spring 205 to close the hydraulic outlet 256. When the reset plate 160 is rotated by the movement of the exhaust rocker arm 150, And presses the reset bar 170.

Here, when the reset plate 160 presses the reset bar 170, the hydraulic pressure inside the piston space 255 is released to the outside, and the engine brake function is momentarily released.

In the embodiment of the present invention, it is difficult to adjust the timing at which the reset plate 160 presses the reset bar 170, and the timing at which the reset plate 160 presses the reset bar 170 is accurately set There is a need.

3 is a partial detailed sectional view of an engine having a compression-relaxation type engine brake function according to an embodiment of the present invention.

3, the gap adjusting screw 200 is passed through from the top to the bottom of the exhaust rocker arm 150 and the screw nut 206 is screwed into the gap adjusting screw 200, And the gap adjusting screw 200 is fixed to the exhaust rocker arm 150.

The gap regulating unit 180 is disposed below the gap regulating screw 200. The gap regulating unit 180 includes a socket 225, a check plate 240, a check spring 235, a piston 220, A piston space 255, a hydraulic outlet 256, a reset spring 205, and a reset bar 170.

The hydraulic pressure is supplied to the piston space 255 of the socket 225 through the exhaust rocker arm 150 and the gap adjusting screw 200 and the supplied oil pressure pushes the piston 220 downward. Accordingly, a gap is removed between the gap adjusting screw 200 and the valve bridge 172.

When the gap between the gap adjusting screw 200 and the valve bridge 172 is removed, the exhaust rocker arm 150 is operated by a separate engine braking protrusion formed on the cam shaft 100, The exhaust rocker arm 150 moves and the gap adjusting screw 200 opens the exhaust valve 152 through the gap adjusting unit 180.

A reset nut 300 is screwed into a top end portion of the exhaust rocker arm 150 from the top to the bottom so that the reset nut 305 is screwed to an upper end of the reset screw 300, 300) to the exhaust rocker arm (150).

The gap between the lower end of the reset screw 300 and the reset bar 170 can be easily adjusted by unscrewing the reset nut 305 and rotating the reset screw 300, 305 can be used to easily fix the reset screw 300 to the exhaust rocker arm.

When an exhaust cam (not shown) formed on the camshaft 100 operates the exhaust rocker arm 150 in the embodiment of the present invention, the exhaust rocker arm 150 rotates (rotates) on the rocker arm shaft 110, The exhaust valve 152 is opened and the reset screw 300 mounted on the exhaust rocker arm 150 presses the reset bar 170 so that the hydraulic pressure generated in the gap adjusting part 180 is transmitted to the outside .

4 is a flowchart showing a part of the flow of hydraulic pressure in an engine having a compression-relieving engine brake function according to an embodiment of the present invention.

4, the hydraulic pressure is supplied to the piston space 255 through the cylinder head 400, the rocker arm shaft 110, the exhaust rocker arm 150, and the gap adjusting screw 200, The valve 120 selectively removes the hydraulic pressure of the oil gallery formed in the rocker arm shaft 110 by an oil pressure relief line.

In the embodiment of the present invention, when the solenoid valve 120 releases the hydraulic pressure in the rocker arm shaft 110 to the hydraulic pressure relieving line 405, the hydraulic pressure is not supplied to the piston space 255, The hydraulic pressure is supplied to the piston space 255 if the valve 120 does not release the hydraulic pressure in the rocker arm shaft 110 to the hydraulic pressure relieving line 405.

Accordingly, since the hydraulic pressure is always supplied to the inside of the rocker arm shaft 110, the hydraulic pressure can be more quickly supplied to the piston space 255 through the operation of closing the solenoid valve 120, And can perform the engine brake function more quickly.

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.

100: camshaft 110: rocker arm shaft
120: Solenoid valve 130: Injector rocker arm
140: intake rocker arm 142: intake valve
150: Exhaust rocker arm 152: Exhaust valve
160: reset plate 170: reset bar
172: valve bridge 180: gap regulating portion
200: gap adjusting screw 205: reset spring
206: Screw nut 210: Snap ring
215: reset plug 220: piston
225: Socket 230: Piston plug
235: check spring 240: check plate
255: piston space 256:
300: reset screw 305: reset nut
400: Cylinder head

Claims (7)

An exhaust rocker arm arranged to rotate about a rocker arm shaft;
A gap adjusting screw fixed through the tip of the exhaust rocker arm; And
An exhaust valve that is lifted by the pressing force of the gap adjusting screw and is arranged to open the exhaust port;
A gap regulating unit for regulating a gap between the exhaust valves by an oil pressure interposed between the gap regulating screw and the exhaust valve; Lt; / RTI >
The gap adjusting unit
A socket having one side disposed in contact with the distal end of the gap adjusting screw and having a piston space opened from the center to the other side;
A piston inserted in the piston space and arranged to be in contact with a front end portion of the exhaust valve and adjusting a gap between the exhaust valve and the exhaust valve by a supplied oil pressure;
A reset bar arranged to open and close a discharge port for discharging the hydraulic pressure supplied to the piston space to the outside; And
A reset screw threaded through one side of the exhaust rocker arm and disposed to press the reset bar according to the operation of the rocker arm; Lt; / RTI >
The reset screw is screwed to the exhaust rocker arm,
A reset nut screwed to the reset screw to fix the reset screw to the exhaust rocker arm; Further comprising: a compression-relieving engine having an engine-brake function. delete The method of claim 1,
Wherein the lower end of the gap adjusting screw is protruded in a hemispherical shape, and a hemispherical groove is formed in the socket in correspondence with the hemispherical protrusion of the gap adjusting screw. The method of claim 1,
Wherein the oil pressure is supplied to the piston space through the rocker arm shaft, the exhaust rocker arm, the gap adjusting screw, and the socket. 5. The method of claim 4,
The hydraulic pressure is transmitted to the rocker arm shaft and the exhaust rocker arm through the cylinder head of the engine,
A solenoid valve for selectively removing the hydraulic pressure supplied to the rocker arm shaft to control operation of the gap regulating unit;
Further comprising: a compression-relieving engine having an engine-brake function. The method of claim 1,
An intake rocker arm disposed on the rocker arm shaft at one side of the exhaust rocker arm so as to press the intake valve; And
An injector rocker arm disposed on the rocker arm shaft at one side of the intake rocker arm so as to press and operate the injector;
Wherein the compression-relieving engine has an engine-brake function. The method of claim 1,
Wherein the gap regulating portion is arranged to press the exhaust valve through a valve bridge,
And the valve bridge is arranged to press the two exhaust valves.
KR1020150148271A 2015-10-23 2015-10-23 Engine having compresseion alleviation type engine brake fuction KR101683527B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11047271B2 (en) 2019-10-07 2021-06-29 Hyundai Motor Company Socket module of compression release type engine brake and operating method of engine brake using thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09268908A (en) * 1996-04-01 1997-10-14 Mitsubishi Motors Corp Auxiliary brake device for compression pressure releasing type engine
KR101036966B1 (en) * 2009-06-09 2011-05-25 기아자동차주식회사 Compression release brake module
KR20120025555A (en) * 2009-06-02 2012-03-15 자콥스 비히클 시스템즈, 인코포레이티드. Method and system for single exhaust valve bridge brake

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09268908A (en) * 1996-04-01 1997-10-14 Mitsubishi Motors Corp Auxiliary brake device for compression pressure releasing type engine
KR20120025555A (en) * 2009-06-02 2012-03-15 자콥스 비히클 시스템즈, 인코포레이티드. Method and system for single exhaust valve bridge brake
KR101036966B1 (en) * 2009-06-09 2011-05-25 기아자동차주식회사 Compression release brake module

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11047271B2 (en) 2019-10-07 2021-06-29 Hyundai Motor Company Socket module of compression release type engine brake and operating method of engine brake using thereof

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