KR20200045153A - Oil Pathway Differential Pressure Type Cam Shaft Lubrication System In Engine - Google Patents

Abstract

According to the present invention, an engine (100) includes a cam shaft lubrication system (1) in which a roller wheel groove (23a) connected to a roller main flow path (21b) connected to a shaft flow (20-2) of a cam shaft (10) opening or closing intake/exhaust valves to enable the inflow of oil from an engine block is formed on a roller wheel (30), an inner wheel hole (23b) sending the oil from the roller wheel groove (23a) to a needle bearing (50) is formed on an inner wheel (40) surrounded by the needle bearing (50), and the roller main flow path (21b)/the inner wheel hole (23b) are arranged across each other at an included angle (K). Therefore, the amount of lubrication oil supplied to the oil flow path of the roller wheel groove (23a)/the inner wheel hole (23b) in which flow-path differential pressure is formed can be controlled without a change to the size of an oil hole. In particular, the amount of oil supplied in a state in which a minimum oil hole machining size is maintained can be additionally reduced in accordance with a request from the engine (100). Meanwhile, a friction reduction effect can be improved with regular oil contact in a tool contact part connected with a continuously variable valve duration (CVVD) tool part (200-1) of the CVVD system.

Description

Oil Pathway Differential Pressure Type Cam Shaft Lubrication System In Engine

The present invention relates to an oil lubrication structure of an engine, and more particularly, to an engine to which a flow path differential pressure type camshaft lubrication system capable of adjusting the oil flow rate at a constant oil hole size is applied.

In general, the engine of a vehicle has an oil lubrication structure so that an appropriate amount of oil is injected into a mechanical contact portion in an engine part, thereby improving friction and wear on the contact mechanism.

An example of the oil lubrication structure is a camshaft lubrication system. The camshaft lubrication system collects oil from the engine block into the oil supply line inside the camshaft, and the branched cam heel flow path (ie, the inner flow path of the inner wheel and needle bearing coupling) and the cam journal flow path (ie, the cam shaft outer diameter) It is sent to the gap passage of the cam journal hub) and then discharged from the CVVD (Continuously Variable Valve Duration) flow path out of the camshaft.

Therefore, the camshaft lubrication system supplies oil from the cam heel flow path while supplying oil to the cam shaft outer diameter / cam journal hub with the inner wheel / needle bearing and the cam journal flow path to the cam heel flow path, and the CVVD mechanism part which is the connection portion between the cam shaft and the cam shaft. Supply to the CVVD system to improve friction and wear together.

Japanese Patent Publication 2015-28329 (2015.02,12)

However, the camshaft lubrication system is a method that requires optimization of the oil hole size by applying a branch structure of the oil hole.

As an example, the oil hole optimization is made so that the oil hole size of the cam journal flow path and the oil hole size of the inner wheel flow path (and / or the oil hole size of the CVVD flow path) are adjusted so that the amount of oil injection through the oil hole is not excessive. You should be able to. This is because the amount of oil injection through an oil hole depends on the size of the oil hole processing, so that when the amount of oil supplied to one part increases, the amount of oil supplied to the other part decreases relatively.

Therefore, it is important to select the proper size of the oil hole machining of the camshaft lubrication system, but the minimum machining size of the oil hole is limited by the influence of the type of working tool and the working environment, which makes it difficult to select an appropriate oil hole machining size. It is bringing.

Accordingly, in view of the above, the present invention can adjust the supply amount of lubricating oil without changing the oil hole size by using the oil passage in which the flow path differential pressure is formed, and in particular, the amount of oil supplied while maintaining the minimum oil hole processing size. It is an object of the present invention to provide a camshaft lubrication system for a flow path differential pressure of an engine that can be further reduced to meet the needs of the engine system and improve the friction reduction effect by the constant oil contact of the mechanical contact area.

The camshaft lubrication system of the present invention for achieving the above object is formed with an inner wheel flow path for supplying oil to an inner wheel surrounding a roller wheel fixed to the cam shaft, and the inner wheel flow path is a roller wheel flow path of the roller wheel. And a staggered arrangement of the inner wheels by the angle of the flow rate control flow path.

In a preferred embodiment, the acute angle is applied to the angle.

In a preferred embodiment, the roller wheel flow path is made of a roller wheel groove communicating with a roller main flow path drilled in the roller wheel, and the flow rate control flow path is made of an inner wheel hole drilled in the inner wheel so as to communicate with the roller wheel groove. The roller main flow path and the inner wheel hole form the sway angle.

In a preferred embodiment, the roller wheel groove has a path passing through the exit of the roller main flow path. The path of the roller wheel groove is made of an obtuse angle and is dug to a depth where oil from the roller main passage can stay. The depth forms a cross section of any of a triangular cross section, a semicircular cross section, and a rectangular cross section.

In a preferred embodiment, the inner wheel hole discharges oil to an outer diameter of the inner wheel and an inner diameter of a needle bearing surrounding the inner wheel.

In a preferred embodiment, the roller wheel flow path is drilled inside the shaft body of the cam shaft to communicate with a shaft flow path through which oil flows, and oil supply is performed. In the shaft flow path, a cam wheel flow path and a cam journal flow path, which are oil discharged from the shaft flow path, and an inflow flow path through which oil flows into the shaft flow path are communicated with each other at a distance. Each of the inflow passage, the cam wheel flow passage, and the cam journal flow passage is drilled in the radial direction of the cam shaft and orthogonal to the shaft flow passage.

And the engine of the present invention for achieving the above object is a cam shaft having a cam for opening and closing the intake / exhaust valve; An inner wheel hole communicating with the shaft passage of the camshaft and a roller wheel groove communicating with a roller main passage through which oil coming from an engine block flows is formed on the roller wheel, and an inner wheel hole that sends oil to the needle bearing toward the needle bearing. A camshaft lubrication system formed on the inner wheel 40 wrapped with the needle bearing, the roller main flow path and the inner wheel hole being staggered at an angle; And a CVVD system coupled to the cam shaft to perform opening / closing control of the intake / exhaust valve.

In a preferred embodiment, the sheet angle is formed of 15 to 20 °, and the roller wheel groove is dug into the roller wheel in a region of 120 to 150 °.

In a preferred embodiment, the CVVD system is lubricated with the camshaft lubrication system, and the lubrication consists of supplying oil from the inner wheel hole.

The camshaft lubrication system applied to the engine of the present invention realizes the following operations and effects by performing oil injection of a flow path differential pressure method.

First, lubricating oil supply to the inner wheel / needle bearing / cam journal and CVVD system of the camshaft is adjusted without changing the oil hole size, thereby solving the difficulty of selecting the oil hole optimization. Second, by applying a flow control groove instead of changing the oil hole size, the amount of supply oil can be minimized on the inner wheel side that requires a relatively small amount of lubrication, and the supply oil can be increased on the cam journal side, which requires a relatively large amount of lubrication. . Third, it is possible to change the supply flow rate of the inner wheel side of the camshaft according to the groove shape of the flow control. Fourth, it is possible to reduce the amount of oil supplied to the cam journal side by about 65% compared to the existing prior art by reducing the flow rate of the inner wheel by the groove triangular cross-sectional shape of the flow rate adjustment by about 61% compared to the conventional art. Fifth, by keeping oil in the groove at all times, it is possible to greatly improve the frictional resistance generated by contact between the roller wheel and the inner wheel with oil.

1 is a configuration diagram of a flow path differential pressure camshaft lubrication system according to the present invention, FIG. 2 is a roller wheel configuration diagram of a camshaft lubrication system according to the present invention, and FIG. 3 is an inner view of a camshaft lubrication system according to the present invention. Wheel configuration diagram, Figure 4 is a flow chart of the oil in the cam wheel of the camshaft lubrication system according to the present invention, Figure 5 is a diagram of oil supply flow rate according to the cross section of the roller wheel groove of the roller wheel according to the present invention, Figure 6 is the present It is an example of an engine to which the camshaft lubrication system according to the invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings, and as such examples, those skilled in the art to which the present invention pertains may be embodied in various different forms, and thus are described herein. It is not limited to the embodiment.

Referring to FIG. 1, the camshaft lubrication system 1 includes a camshaft 10 and an oil lubrication line 20. In particular, the oil lubrication line 20 is provided with an inner wheel flow path 20-5 on the cam heel 11, and the inner wheel flow path 20-5 is a roller wheel 30 embedded in the cam heel 11. Since the roller wheel flow path 21 and the flow rate control flow path 23 for the inner wheel 40 and the needle bearing 50 are made, it is possible to adjust the supply amount of the lubricating oil without changing the oil hole size due to the flow path differential pressure. Therefore, the camshaft lubrication system 1 is referred to as a flow path differential pressure type camshaft lubrication system.

Specifically, the cam shaft 10 includes a cam heel 11, a cam journal 13, a valve cam 15, and a shaft end 17.

For example, the cam heel 11 forms an inner roller flow path 20-5 for the built-in roller wheel 30, the inner wheel 40, and the needle bearing 50, and a CVVD system (Continuously Variable Valve Duration System). ) CVVD mechanism portion (see Fig. 6) is coupled. The cam journal 13 is a hub between the cam heel 11 and the valve cam 15 (or the interval between the valve cam 15 and the valve cam 15) as a hub (eg, the cam journal hub of FIG. 6) 10-1)). The valve cam 15 is in contact with the valve tappet, and is made of a quantity corresponding to the quantity of valves provided in the engine cylinder. The shaft end 17 is connected to a belt or the like to transmit rotational force as an end portion of the cam shaft 10. Therefore, the cam shaft 10 is typically a cam shaft applied to an engine.

Specifically, the oil lubrication line 20 includes an inflow passage 20-1, a shaft passage 20-2, a cam wheel passage 20-3, a cam journal passage 20-4, and an inner wheel passage 20- 5), and is divided into the following structural features.

For example, the inflow passage 20-1, the shaft passage 20-2, the cam wheel passage 20-3, and the cam journal passage 20-4 are common oils formed in the cam shaft 10. Construct a lubrication line.

Therefore, the inflow passage 20-1 is perforated in the radial direction to the shaft body of the cam shaft 10, and the oil rising from the engine block acts as a passage through which the cam shaft 10 flows. The shaft passage 20-2 is perforated in the axial direction (Axial Direction) of the cam shaft 10 inside the shaft body of the cam shaft 10, and communicates with the inflow passage 20-1, and the inflow passage 20- It is filled with the oil supplied in 1). The cam wheel flow path 20-3 is perforated in the radial direction of the cam heel 11, and the oil supplied from the shaft flow path 20-2 is an external mechanism (eg, CVVD mechanism 200 of FIG. 6). (See -1)) to communicate with the inner wheel flow path 20-5. The cam journal flow path 20-4 is perforated in the radial direction of the shaft body of the cam shaft 10, and a hub coupled to the cam journal 13 (eg, the cam journal hub 10- of FIG. 6) 1) Refer to) to communicate with the shaft passage 20-2 so that lubrication is achieved, the oil is supplied. Therefore, each of the inflow passage 20-1, the cam wheel passage 20-3, and the cam journal passage 20-4 is orthogonal to the shaft passage 20-2.

On the other hand, the inner wheel flow path 20-5 communicates with the shaft flow path 20-2 through the roller wheel 30 coupled to the shaft body of the cam shaft 10 in the interior of the cam heel 11, and the After the roller wheel 30 is coupled to the inner wheel 40 wrapped with a needle bearing 50, the oil supplied from the shaft passage 20-2 is lubricated for the needle bearing 50, and then the cam wheel passage 20-3 ).

Specifically, the roller wheel 30, the inner wheel 40 and the needle bearing 50 are surrounded by a cam heel housing 11-1 and embedded inside the cam heel 11. Therefore, the assembly structure of the roller wheel 30, the inner wheel 40 and the needle bearing 50 is the same as before.

On the other hand, referring to the cross-section AA of Figure 1, the inner wheel flow path 20-5 is divided into a roller wheel flow path 21 formed on the roller wheel 30 and a flow rate control flow path 23 formed on the inner wheel 40. .

For example, the roller wheel flow path 21 includes a roller shaft hole 21a, a roller main flow path 21b, and a roller sub flow path 21c formed in the roller wheel 30. The roller shaft hole 21a is drilled in a radial direction to the roller body 31 of the roller wheel 30, and the roller body 31 is fitted into the roller wheel hole 10A of the cam shaft 10. In the state, it is communicated with the shaft passage 20-2 to receive oil. The roller main flow path 21b and the roller sub flow path 21c are perforated in the axial direction to the roller body 31 and the roller head 33 of the roller wheel 30, and the roller main flow path 21b ) Is formed on the roller body 31 and the roller head 33 to communicate with the roller wheel groove 23a, while the roller sub-path 21c is formed on the roller body 31 to form the roller wheel of the cam shaft 10 It is in communication with the hole 10A. In particular, the roller main flow passage 21b has a larger diameter than the roller sub flow passage 21c to pass more oil than the roller sub flow passage 21c.

For example, the flow control flow path 23 is composed of a roller wheel groove 23a and an inner wheel hole 23b. The roller wheel groove 23a is grooved along the surface of the roller head 33 of the roller wheel 30 to communicate with the roller main flow path 21b, while the inner wheel hole 23b has a roller wheel groove 23a. It is drilled in the inner wheel 40 to communicate with the length of the.

Therefore, the inner wheel flow path 20-5 is the flow path length of the roller wheel flow path 21 and the flow control flow path 23 through which oil flows from the roller wheel 30 toward the needle bearing 50 through the inner wheel 40. That is, by forming the flow path differential pressure from the roller wheel groove (23a and the length of the inner wheel hole (23b)), the amount of lubrication oil is adjusted without changing the size of the oil hole, and the oil storage function always allows oil contact to the needle bearing (50). It is possible.

Meanwhile, FIGS. 2 and 3 show detailed configurations of the roller wheel 30 and the inner wheel 40, respectively.

Referring to Figure 2, the roller wheel 30 is composed of a cylindrical roller body 31 and a semi-cylindrical roller head 33 to form an approximately "T" shaped first roller wheel 30- 1) and a second roller wheel (30-2) divided into two pairs of roller wheel pockets (43) of the inner wheel 40 (see Fig. 3) at an angle of about 90 ° W (alternate) angle. Therefore, the first roller wheel 30-1 and the second roller wheel 30-2 are formed by two roller wheels embedded in the cam heel 11 of the cam shaft 10. It is the same as a typical pair of roller wheels.

However, the roller wheel grooves 23a formed on each of the first roller wheel 30-1 and the second roller wheel 30-2 are provided with the roller main flow path 21b on the semi-cylindrical surface of the roller head 33. It is dug to a predetermined depth to have an area of about 120 to 150 ° as a passing path, and the predetermined depth is formed to a depth at which oil from the roller main flow path 21b can stay in the roller wheel groove 23a. Therefore, the oil paths formed in each of the first roller wheel 30-1 and the second roller wheel 30-2 are formed into a roller shaft hole 21a, a roller main flow path 21b, and a roller sub flow path 21c. Unlike the conventional oil path, there is a difference consisting of a roller shaft hole 21a, a roller main flow path 21b, a roller sub flow path 21c, and a roller wheel groove 23a.

In particular, the roller wheel groove 23a is processed into various cross-sectional shapes such as a triangular cross-section (A shape), a semi-circular cross-section (B shape) and a square cross-section (C shape) through tool processing. In this case, the difference between the triangular cross section (A shape) / semi-circular cross section (B shape) / square cross section (C shape) has a degree difference, but improves the oil supply flow rate compared to the existing structure.

Referring to FIG. 3, the inner wheel 40 includes an inner wheel body 41, a roller wheel pocket 43, and a sub-channel 45.

For example, the inner wheel body 41 is formed in a cylindrical shape to form a roller wheel pocket 43 and a sub-channel 45, and a needle bearing 50 is enclosed inside the cam wheel 11. The roller wheel pocket 43 passes through the shaft body of the cam shaft 10, and positions the roller wheel 30 fixed to the shaft body. The sub-channel 45 is divided into a left sub-channel 45-1 and a right sub-channel 45-2, positioned around the roller wheel pocket 43, and filled with oil.

In particular, the roller wheel pocket 43 includes a main pocket 43a in a large space, a left head pocket 43a-1 and a right head pocket 43a-2 in a relatively small space. In the main pocket 43a, the roller body 31 of the roller wheel 30 is located together with the shaft body of the cam shaft 10, and the left head pocket 43a-1 and the right head pocket 43a-2 are disposed. The roller head 33 of the roller wheel 30 is located in each.

Therefore, when the roller wheel 30 is divided into the first roller wheel 30-1 and the second roller wheel 30-2, the rollers of the first and second roller wheels 30-1 and 30-2 The body 31 is located in the main pocket 43a with first and second roller wheels 30-1 and 30-2, and the roller head 33 of the first roller wheel 30-1 has a left head pocket ( 43a-1) while the roller head 33 of the second roller wheel 30-2 is located in the right head pocket 43a-2.

Therefore, the inner wheel hole 23b drilled in the inner wheel body 41 communicates with the roller wheel groove 23a located in the left head pocket 43a-1 (and / or the right head pocket 43a-2). In particular, the inner wheel hole 23b is arranged to have a staggered position at a yaw angle K of about 15 to 20 ° relative to the roller main flow passage 21b.The formation of such a yaw angle W increases as the staggered angle increases. The length of the flow path from the exit of 30 (ie, the roller main flow path 21b) to the inlet of the inner wheel 40 (ie, the inner wheel hole 23b) (that is, the groove length of the roller wheel groove 23a) ) Because the effect of the differential pressure on the flow path increases.

Referring to FIG. 4, the inner wheel 40 adjusts the amount of lubricating oil supply without changing the oil hole size due to the flow path differential pressure due to the long flow path length when supplying the oil 70 to the needle bearing 50 and oil storage. As a function, constant oil contact with the needle bearing 50 and the friction area is also possible. In this case, each of the first roller wheel 30-1 and the second roller wheel 30-2 constituting the roller wheel 30 implement the same lubrication action.

On the other hand, Figure 5 illustrates a diagram of the oil supply flow rate in accordance with the application of the non-applied roller wheel groove (23a).

Referring to the 갬 journal oil supply flow rate diagram (A) of FIG. 5, when the supply pressure is 2.5 bar, the roller wheel groove 23a of the triangular cross-section (A shape) has an oil supply flow rate of the 갬 journal 13 of about 61 compared to the previous one. %, The roller wheel groove 23a of a semi-circular cross-section (B shape) is approximately 39% of the oil supply flow rate of the journal 13, and the roller wheel groove 23a of a square cross-section (C shape) is a journal 13 ), The oil supply flow rate is increased by about 20%.

In the inner heel oil supply flow rate diagram (B) of FIG. 5, when the supply pressure is 2.5 bar, the triangular cross-section (A shape) roller wheel groove 23a reduces the oil supply flow rate of the inner wheel 40 by about 65% compared to the previous one. The inner wheel 40 of the inner wheel 40 can be compared to the existing case even if it is smaller than about 65% in each case of the roller wheel groove 23a of the semi-circular section (B shape) and the roller wheel groove 23a of the square section (C shape). It reduces the oil supply flow rate.

Therefore, from the diagram of oil supply flow rate according to the application of the non-applied contrast of the roller wheel groove 23a, the roller wheel groove 23a has a triangular cross section (A shape) and a semicircular cross section (B shape) and a square cross section (C). It proves experimentally that the oil supply flow rate is effectively increased or decreased in the order of shape). The reason for this is that the larger the resistance generated in the roller wheel groove 23a, the higher the flow rate of supply to the cam journal as a counterpart.

Meanwhile, FIG. 6 is an example of an engine to which a camshaft lubrication system according to the present invention is applied. As shown, the engine 100 includes a camshaft lubrication system 1 and a CVVD system (Continuously Variable Valve Duration System) 200 on the camshaft 10 together.

Specifically, the CVVD system 200 controls the position of short / long duration by rotating a motor (or actuator) controlled by a controller (or engine controller) to control the opening / closing valve opening / closing timing. do. Therefore, the CVVD system 200 is composed of a CVVD motor, a hall sensor / cam sensor, and the like for controlling the CVVD mechanism unit 200-1 in the same way as a conventional CVVD system. However, the CVVD system 200 is a conventional CVVD system because the CVVD mechanism 200-1 is lubricated with oil from the cam wheel flow path 20-3 by being defective in the cam wheel 11 of the cam shaft 10. And lubrication structure.

Specifically, the cam shaft lubrication system 1 is the same as the cam shaft lubrication system 1 described through FIGS. 1 to 5. However, the cam shaft lubrication system 1 lubricates oil from the cam wheel flow path 20-3 of the cam wheel 11 of the cam shaft 10 to the CVVD mechanism 200-1 of the CVVD system 200. There is a difference in supplying oil. In addition, the cam shaft lubrication system 1 forms a plurality of cam journals 13 on the cam shaft 10 to match the number of engine cylinders, and the cam journals 13 are combined with the cam journal hub 10-1. Thereby, there is a difference in supplying oil from the cam journal flow path 20-4 as a lubricating oil for the cam journal hub 10-1.

As described above, the engine 100 according to this embodiment is in communication with the shaft passage 20-2 of the cam shaft 10 that opens and closes the intake / exhaust valve, and the roller main passage through which oil coming from the engine block flows in ( A roller wheel groove 23a in communication with 21b) is formed on the roller wheel 30, and an inner wheel hole 23b that sends oil toward the needle bearing 50 with oil from the roller wheel groove 23a is necessary for the needle bearing 50 ) Is formed on the inner wheel 40 wrapped with a roller, and the flow path differential pressure is formed by including the cam shaft lubrication system 1 in which the roller main flow path 21b / inner wheel hole 23b are alternately arranged at four angles K The oil passage of the roller wheel groove (23a) / inner wheel hole (23b) allows adjustment of the amount of lubricating oil supplied without changing the size of the oil hole, and in particular, the amount of oil supplied while maintaining the minimum oil hole processing size is applied to the engine (100). CV of the CVVD system 200 while being able to be further reduced to meet the needs of The friction-reducing effect is improved by always contacting the oil in the instrument contact portion to which the VD mechanism portion 200-1 is connected.

1: Camshaft lubrication system 10: Camshaft
10-1: Cam Journal Hub 10A: Roller Wheel Hole
11: Cam Hill 11-1: Cam Hill Housing
13: cam journal 15: valve cam
17: shaft end 20: oil lubrication line
20-1: inflow passage 20-2: shaft passage
20-3: Cam Wheel Euro 20-4: Cam Journal Euro
20-5: Inner wheel flow path 21: Roller wheel flow path
21a: roller shaft hole 21b: roller main flow path
21c: roller sub-channel 23: flow control channel
23a: roller wheel groove 23b: inner wheel hole
30: roller wheel 30-1,30-2: first and second roller wheels
31: roller body 33: roller head
40: inner wheel 41: inner wheel body
43: roller wheel pocket 43a: main pocket
43b-1.43b-2: Left and right head pockets
45: sub-channel 45-1,45-2: left and right sub-channel
50: needle bearing 70: oil
100: engine
200: CVVD system (Continuously Variable Valve Duration System)
200-1: CVVD mechanism

Claims (17)

An inner wheel flow path for oil supply is formed by the inner wheel surrounding the roller wheel fixed to the camshaft, and the inner wheel flow path is staggered by the angle between the roller wheel flow path of the roller wheel and the flow control flow path of the inner wheel.
Cam shaft lubrication system, characterized in that it is included.
The camshaft lubrication system according to claim 1, wherein the angle of incidence consists of an acute angle.
The method according to claim 1, The roller wheel flow path is made of a roller wheel groove in communication with the roller main flow path drilled in the roller wheel, and the flow rate control flow path is made of an inner wheel hole drilled in the inner wheel to communicate with the roller wheel groove. It characterized in that the camshaft lubrication system.
4. The camshaft lubrication system according to claim 3, wherein the roller main flow path and the inner wheel hole form the between angles.
4. The camshaft lubrication system according to claim 3, wherein the roller wheel groove has a path passing through an outlet of the roller main flow path.
The method according to claim 5, The path of the roller wheel groove is a camshaft lubrication system, characterized in that consisting of an obtuse angle.
The method according to claim 5, The path of the roller wheel groove is a camshaft lubrication system, characterized in that the oil from the roller main passage is dug to a depth that can stay.
The camshaft lubrication system of claim 7, wherein the depth forms one of a triangular cross-section, a semi-circular cross-section, and a square cross-section.
4. The camshaft lubrication system of claim 3, wherein the inner wheel hole discharges oil to an outer diameter of the inner wheel and an inner diameter of a needle bearing surrounding the inner wheel.
The camshaft lubrication system according to claim 1, wherein the roller wheel flow path is drilled inside the shaft body of the cam shaft to communicate with a shaft flow path through which oil flows, and oil is supplied.
The cam shaft lubrication according to claim 10, wherein a cam wheel flow path and a cam journal flow path, which are oil discharged from the shaft flow path, and an oil flow path through which the oil flows into the shaft flow path are connected to the shaft flow path. system.
The cam shaft lubrication system according to claim 11, wherein each of the inflow passage, the cam wheel passage and the cam journal passage is drilled in the radial direction of the cam shaft and orthogonal to the shaft passage.
Cam shaft with a cam for opening and closing the intake / exhaust valve,
An inner wheel hole communicating with the shaft passage of the camshaft and a roller wheel groove formed in a roller wheel communicating with a roller main passage through which oil coming from an engine block flows is formed, and an inner wheel hole that sends oil toward the needle bearing from the roller wheel groove A camshaft lubrication system formed on an inner wheel wrapped with the needle bearing, wherein the roller main flow path and the inner wheel hole are staggered at an angle;
A CVVD system (Continuously Variable Valve Duration System) coupled to the camshaft to perform opening and closing control of the intake / exhaust valve;
Engine characterized in that it is included.
The engine according to claim 13, wherein the angle of incidence is 15 to 20 °.
The engine according to claim 13, wherein the roller wheel groove is dug into the roller wheel in a region of 120 to 150 °.
The engine according to claim 13, wherein the CVVD system is lubricated with the camshaft lubrication system.
17. The engine of claim 16, wherein the lubrication of the CVVD system consists of supplying oil from the inner wheel hole.

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