KR101134967B1 - Lubriction system of engine - Google Patents

Abstract

An engine lubrication system according to an embodiment of the present invention includes a cam carrier mounted on a cylinder head, a cam shaft mounted on the cam carrier, a control shaft mounted on the cam carrier corresponding to the cam shaft, and the control shaft. And a driving unit for rotating the valve to continuously change the timing or lift amount of the valve. The cylinder head and the cam carrier receive oil supplied from an oil pump to supply oil to the cam shaft, the control shaft, and the driving unit. A flow path for supplying the gas is formed.

Here, oil (lubricating oil) is supplied along the hollow portion of the control shaft, and oil is easily supplied to the worm through a worm wheel mounted thereto.

Lubrication, oil, pump, cylinder head, cam carrier, control shaft, cam shaft

Description

Lubrication system of the engine {LUBRICTION SYSTEM OF ENGINE}

The present invention relates to a lubrication system of an engine, and more particularly to an lubrication system of an engine having a variable continuous valve lift system.

In order to realize proper valve operation according to the rotational speed of the engine, a variable valve is designed to design a plurality of cams for driving the valve or to operate the valve according to the engine speed. lift (VVL) devices are being studied.

The variable valve lift apparatus requires a lubrication system in order to minimize power loss and reduce frictional wear in the process of driving the valve using the rotational force of the camshaft.

In particular, the variable valve lift apparatus requires a system for supplying lubricating oil to each component having a control shaft, a worm wheel, a worm, and a worm gear.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a lubrication system of an engine for supplying lubricating oil to respective components of the variable valve lift apparatus.

The lubrication system of the engine according to the present invention for achieving the above object, the cam carrier mounted on the cylinder head, the cam shaft mounted on the cam carrier, the control shaft mounted on the cam carrier corresponding to the cam shaft, and the And a driving unit for rotating the control shaft to continuously change the movement timing or lift amount of the valve, wherein the cylinder head and the cam carrier are supplied with oil supplied from an oil pump, and the cam shaft, the control shaft, and the A flow path for supplying oil to the drive unit is formed.

The camshaft includes an intake camshaft disposed in the longitudinal direction of the cylinder head in correspondence with the intake valve, and an exhaust camshaft disposed in parallel with the intake camshaft in correspondence with the exhaust valve, wherein the control shaft includes the intake air. It is arranged alongside the camshaft.

Further comprising a hydraulic lash adjustor (hydraulic lash adjustor) for adjusting the gap between the drive parts for controlling the movement of the valve, wherein the flow path, the first flow path formed inside the cylinder head to receive oil from the oil pump, A second flow passage branched from the first flow passage and crossing the inside of the cylinder head, a third flow passage branched at one end of the second flow passage and supplying hydraulic pressure to the hydraulic clearance adjusting portion corresponding to the intake valve; And a fourth flow passage branched from the other end of the second flow passage and supplying hydraulic pressure to the hydraulic pressure adjusting portion corresponding to the exhaust valve.

A first flow path formed inside the cylinder head to receive oil from the oil pump, a second flow path branched from the first flow path and formed across the inside of the cylinder head, and branched in the middle of the second flow path to the cylinder A fifth flow path formed through the head and the cam carrier, a sixth flow path branched from the fifth flow path, and formed across the inside of the cam carrier; And a seventh flow path formed along the portion, and an eighth flow path branched from the other end of the sixth flow path and formed along the central hollow portion of the exhaust camshaft.

A first flow path formed inside the cylinder head to receive oil from an oil pump, a second flow path branched from the first flow path and formed across the inside of the cylinder head, branched in the middle of the second flow path, and A fifth flow path formed through the cam carrier, a sixth flow path branched from the fifth flow path and formed across the inside of the cam carrier, branched at one end of the sixth flow path and along a central hollow portion of the intake camshaft; A seventh flow path that is formed, an eighth flow path branched from the other end of the sixth flow path and formed along the hollow portion of the exhaust camshaft, and a ninth flow path branched from the eighth flow path and formed along the hollow portion of the control shaft; It further includes.

The drive unit includes a worm wheel mounted at one end of the control shaft, a worm for rotating the worm wheel, and a motor for rotating the worm, branched from the ninth flow path, and the worm through the control shaft and the worm wheel. A tenth flow path for supplying oil is formed.

The control shaft further includes a bearing, wherein the bearing has a bearing flow path formed from the outer circumferential surface to the inner circumferential surface, and a slot is formed on the outer circumferential surface of the control shaft in the rotational direction corresponding to the bearing flow path, the slot and the hollow It is characterized in that the connection hole for connecting the portion is formed.

According to the lubrication system of the engine according to the present invention as described above, the oil (lubricating oil) is supplied along the hollow portion of the control shaft, the oil is easily supplied to the worm through the worm wheel attached thereto.

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

1 is a partial perspective view of a cylinder head provided in an engine according to an embodiment of the present invention.

Referring to FIG. 1, the engine includes a cylinder head 100, a cam carrier 115, an intake cam shaft 120a, an exhaust cam shaft 120b, a sprocket 110, a worm wheel 130, and a variable mechanism 140. It includes.

The cam carrier 115 is mounted on an upper portion of the cylinder head 100, and the intake cam shaft 120a and the exhaust cam shaft 120b are installed side by side on the cam carrier 115.

One end of each of the intake camshaft 120a and the exhaust camshaft 120b is equipped with the sprocket 110, and the sprocket 110 is connected to a crankshaft through a timing chain (not shown). The rotational force is transmitted from.

The variable mechanism 140 is disposed adjacent to the intake cam shaft 120a, and the variable mechanism 140 is moved by the worm wheel 130 to lift a valve actuated by the intake cam shaft 120a. Adjust the movement timing continuously.

2 is a schematic perspective view of a continuous variable valve lift system provided in an engine according to an exemplary embodiment of the present invention.

2, the continuous variable valve lift system includes an intake camshaft 120a, a variable mechanism 140, a valve 240, and a motor 230.

The variable mechanism 140 includes a control shaft 210, a rocker arm 246, a swing arm 245, and a hydraulic lash adjustor (HLA).

An input cam 205 is formed at one outer circumferential surface of the intake cam shaft 120a, and the rocker arm 246 operated by the input cam 205 is mounted on the control shaft 210, and the rocker arm The swing arm 245 and the valve 240 move downward.

A worm wheel 130 is mounted at one end of the control shaft 210, a worm 220 is mounted on the worm wheel 130, and the motor 230 rotates the worm 220 to form the worm wheel ( 130 and the control shaft 210 is rotated.

The position of the rocker arm 246 is changed according to the rotational position of the control shaft 210 to change the lift amount and timing of the valve 240.

Here, the hydraulic clearance adjusting unit 247 supports one side of the variable mechanism 140 to remove the gap between the input cam 205 and the rocker arm 246 of the cam shafts 120a and 120b. .

As shown, the intake cam shaft 120a and the control shaft 210 have a hollow portion 207 having an empty inside, and have an oil supply structure therein.

3 is a perspective view illustrating an oil passage formed in an engine according to an embodiment of the present invention, and FIG. 4 is a detailed view of FIG. 3.

Referring to FIGS. 1, 2, and 3, the cylinder head 100, the cam carrier 115, the intake camshaft 120a, and the exhaust camshaft 120b are provided with respective components. Is supplied.

3 and 4, a first passage op2 is formed inside the cylinder head 100. The first flow path op2 is formed inside the cylinder head 100 in a downward direction to receive hydraulic pressure from a main flow path (not shown) of a cylinder block (not shown) disposed below.

The second channel op4 is formed in a horizontal direction by branching from an upper end of the first channel op2 to cross the inside of the cylinder head 100. The third channel op6 and the fourth channel op8 are branched at both ends of the second channel op4, respectively.

Here, the third passage (op6) and the fourth passage (op8) are arranged in the longitudinal direction in the cylinder head 100 in parallel with each other to supply the hydraulic pressure to the hydraulic clearance adjusting unit 247.

The fifth flow path op10 branches from the center portion of the second flow path op4 to the upper portion, and the fifth flow path is formed through the cam carrier 115 in the cylinder head 100. Here, the sixth channel op12 branches to both sides of the cam carrier 115 from the upper end of the fifth channel op10.

The sixth flow path op12 is formed above the second flow path op4, and the sixth flow path op12 and the second flow path op4 are arranged in parallel with each other.

As described above, the second passage op4 is formed in the cylinder head 100, and the sixth passage op12 is formed in the cam carrier 115 mounted to the cylinder head 100.

In addition, a seventh channel op14 and an eighth channel op16 are respectively formed through the hollow portion 207 of the intake cam shaft 120a and the exhaust cam shaft 120b, and the seventh channel op14 is formed. ) And the eighth flow path (op16) are connected to both ends of the third flow path (op6).

The first channel op2, the second channel op4, the third channel op6, the fourth channel op8, the fifth channel op10, and the sixth channel op12 are the The seventh channel op14 and the eighth channel op16 are formed in the cam carrier 115, and the hollow portions 207 and FIG. 2 of the intake cam shaft 120a and the exhaust cam shaft 120b are formed. Is formed according to the following).

In addition, a ninth flow path op18 is formed as the hollow portion 207 of the control shaft 210, and the ninth flow path op18 is connected to one side of the sixth flow path op12.

A tenth flow path (op20) is formed from the inner circumferential surface of the hollow shaft 207 of the control shaft 210 to the outer circumferential surface, and the oil flows into the worm wheel 130 and the worm 220 through the tenth flow path (op20). Is supplied.

Referring to FIG. 3, an eleventh channel op22 receiving oil from a cylinder block (not shown) is formed in the cylinder head 100, and the eleventh channel op22 is the intake cam shaft 120a. ) And a flow path OP24, OP28, OP30 for supplying oil to the sprocket 110 mounted on the exhaust cam shaft 120b and a flow path OP26 for supplying oil to the tensioner.

5 is a cross-sectional view of a control shaft and a bearing supporting the same according to an embodiment of the present invention.

Referring to FIG. 5, a bearing 500 is mounted to the cam carrier 115, and the bearing 500 rotatably supports the control shaft 210.

The sixth flow path op12 is horizontally formed in the cam carrier 115, and a bearing flow path 505 is formed in the bearing 500 to communicate with the inner circumferential surface of the bearing 500 in response to the sixth flow path op12. The bearing passage 505 receives oil from the sixth passage op12.

Corresponding to the bearing flow path 505, the control shaft 210 is formed with a connection flow passage 512 from the outer peripheral surface to the inner peripheral surface of the hollow portion.

Here, a slot 510 is formed on the outer circumferential surface of the control shaft 210 in a rotational direction of the control shaft 210 corresponding to the connection channel 512, and the slot 510 and the connection channel 512 are formed. Through the hollow portion 207, that is, supply the oil to the ninth flow path (op18).

In the embodiment of the present invention, the hollow shaft through the sixth flow path (op12), the bearing flow path 505, the slot 510, and the connection flow path 512 even if the control shaft 210 is rotated by a predetermined angle The oil is smoothly supplied to the portion 207, that is, the ninth flow path op18.

In an embodiment of the present invention, the slot 510 is formed on the outer circumferential surface of the control shaft 210, but a slot may be formed on the inner circumferential surface of the bearing 500.

6 is a cross-sectional view of a control shaft and a worm mounted thereto according to an embodiment of the present invention.

Referring to FIG. 6, the ninth flow path op18 is formed as the hollow part 207 in the middle of the control shaft 210, and the control shaft 210 and the worm wheel are formed at the hollow part 207. The tenth passage op20 is formed through the worm 220 through 130.

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.

1 is a partial perspective view of a cylinder head provided in an engine according to an embodiment of the present invention.

2 is a schematic perspective view of a continuous variable valve lift system provided in an engine according to an exemplary embodiment of the present invention.

3 is a perspective view illustrating an oil flow path formed in an engine according to an embodiment of the present invention.

4 is a partial detailed view of FIG. 3.

5 is a cross-sectional view of a control shaft and a bearing supporting the same according to an embodiment of the present invention.

6 is a cross-sectional view of a control shaft and a worm mounted thereto according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: cylinder head

110: sprocket

115: cam carrier

120a: intake camshaft

120b: exhaust camshaft

130: worm wheel

140: variable mechanism

205: input cam

207: hollow part

210: control shaft

220: worm

230: motor

240: valve

245 swing arm

246: rocker arm

247: hydraulic lash adjustor (HLA)

500: bearing

505: bearing euro

510: slot

512: connecting hole

op2, op4, op6, op8, op10, op12, op14, op16, op18, op20, op22, op24, op26, op28, and op30: first, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, and 15 euros

Claims (7)

delete A cam carrier mounted to the cylinder head; A cam shaft mounted to the cam carrier; A control shaft mounted to the cam carrier corresponding to the cam shaft; And a driving unit which rotates the control shaft to continuously change the movement timing or the lift amount of the valve. The cylinder head and the cam carrier are provided with a flow path for supplying oil to the cam shaft, the control shaft, and the drive unit by receiving oil supplied from an oil pump, The camshaft may include an intake camshaft disposed in the longitudinal direction of the cylinder head in correspondence with the intake valve; And an exhaust cam shaft disposed in parallel with the intake cam shaft corresponding to the exhaust valve, wherein the control shaft is disposed in parallel with the intake cam shaft. The flow path may include a first flow path formed inside the cylinder head to receive oil from an oil pump; A second flow passage branched from the first flow passage and formed to cross the inside of the cylinder head; A fifth flow path branched in the middle of the second flow path and formed through the cylinder head and the cam carrier; A sixth channel branched from the fifth channel and formed to cross the inside of the cam carrier; A seventh flow passage branched at one end of the sixth flow passage and formed along a central hollow portion of the intake cam shaft; An eighth flow path branched from the other end of the sixth flow path and formed along the hollow part of the exhaust camshaft; And a ninth flow passage branched from the eighth flow passage and formed along the hollow portion of the control shaft, The drive unit, a worm wheel mounted to one end of the control shaft; A worm for rotating the worm wheel; And a motor for rotating the worm, A lubrication system of an engine, characterized in that the tenth flow path is branched from the ninth flow path to supply oil to the worm through the control shaft and the worm wheel. 3. The method of claim 2, Further comprising a hydraulic lash adjustor (hydraulic lash adjustor) for adjusting the gap between the drive parts for controlling the movement of the valve, the flow path, A third flow passage branched at one end of the second flow passage to supply hydraulic pressure to the hydraulic pressure adjusting portion corresponding to the intake valve; And A fourth flow passage branched from the other end of the second flow passage to supply hydraulic pressure to the hydraulic pressure adjusting portion corresponding to the exhaust valve; Lubrication system of the engine comprising a. delete delete delete 3. The method of claim 2, A bearing into which the control shaft is inserted; Further comprising: The bearing passage is formed in the bearing from the outer circumference to the inner circumferential surface, a slot is formed on the outer circumferential surface of the control shaft corresponding to the bearing flow path, and a connection hole is formed to connect the slot and the hollow part. Lubrication system of the engine.

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