JP2001082578A - Camshaft system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camshaft system which can adjust both a lift and a timing of a valve. SOLUTION: This camshaft system has a shaft 210, and a plurality of cams 220 integrated with the shaft 210 with specified clearances. It also has followings. A camshaft arranged on one side of the shaft has a first gear member 212 formed with a plurality of teeth. A motor 300 enables linear reciprocation of the camshaft by arranging a second gear member formed with a plurality of teeth, to be meshed with the teeth of the first gear member on one side of the camshaft, and rotating it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a camshaft system, and more particularly, to a camshaft system having an improved mechanism for continuously realizing a variable valve lift and a variable valve timing.

[0002]

2. Description of the Related Art In general, a camshaft is provided with the same number of cams as intake and exhaust valves in consideration of the position and angle in accordance with the opening and closing timing of the valve. In the formula, it is mounted on the cylinder head. Usually 3-4 for camshaft
A journal part is supported by a bearing, and a timing gear engraved with a timing mark indicating the opening and closing timing of the valve is provided at one end thereof, and a fuel pump is driven on the other cam parts. Gears to drive the cam and the distributor

Further, the cam imparts an opening / closing motion to the valve as the camshaft rotates, and the motion is transmitted when a valve lifter or a rocker arm comes into contact with the surface of the cam. There are various types of cam shapes, such as a convex cam and a concave cam.

Further, a cam having an appropriate shape is selected according to the period during which the valve is open and the amount of operation of the valve. Particularly, in the case of an automobile engine that requires high speed rotation, the valve is opened and closed so as to increase the intake efficiency and the exhaust efficiency of the mixed gas, and when the valve is in close contact with the sheet, the impact is reduced as much as possible. An egg-shaped cam is used. Further, the difference between the vertical and horizontal directions of the cam is called a cam lift, and the valve is opened by the lift.

On the other hand, at present, most engines are of the type having general specifications in which an intake valve or an exhaust valve is opened and closed according to the rotation of the camshaft as described above. Eventually, the leading-edge engine seeks low fuel consumption and high output by variably adjusting the valve lift amount or changing the valve opening / closing timing appropriately to perform operation appropriate to the situation.

[0006]

As described above, specific systems for adjusting the lift amount of the valve and adjusting the timing of the valve have been applied for patents, respectively, but these systems satisfy the two at the same time. Does not exist at the moment.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a camshaft system capable of adjusting a valve lift and adjusting a valve timing. To provide.

[0008]

SUMMARY OF THE INVENTION The camshaft system according to the present invention, which has been made to achieve the above object, comprises:
A camshaft including a shaft, a plurality of cams formed integrally with the shaft at a predetermined distance from the shaft, and a first gear member provided on one side of the shaft and having a plurality of teeth cut therefrom And a second gear member having a plurality of teeth cut so as to mesh with the teeth of the first gear member is installed and rotated on one side of the camshaft so that the camshaft can linearly reciprocate. The motor is characterized by comprising:

Further, the cam has a first cross-sectional area at one end and a second cross-sectional area at the other end which are different in size. The second nose portions having a cross-sectional area of 2 are formed so that the phases thereof are different from each other.

Further, the first gear member is formed on the outer peripheral surface of the shaft integrally with the shaft.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic partially exploded perspective view of the configuration of a camshaft system according to the present invention.

Referring to the drawings, the camshaft system according to the present invention can implement variable valve timing together with variable valve lift. Next, the configuration will be described.

As shown in FIG. 2, which will be described later, a shaft (210) rotatably provided on one side of the cylinder head (100), and the shaft (210) is integrated with the shaft (210) at a predetermined interval. A plurality of cams (220) formed, and linear reciprocating means provided on one side of the shaft (210) for rotating the shaft (210) and performing linear reciprocating motion are provided. Can be

The linear reciprocating means includes the shaft (2)
10) A first gear member (21l) provided on one side.
And a shaft (21) provided on one side of the shaft (210) and meshed with a first gear member (211).
0) is reciprocated linearly.
12) and a motor (300) for rotating the second gear member (212). The first gear member (211) may be provided with a separate gear on the shaft (210).
0) A plurality of teeth are formed integrally with the shaft (210) on one outer peripheral surface of the second gear member (212).
The first gear member (21) of the shaft (210) can be engaged with the first gear member (211) on its outer peripheral surface.
As in 1), a plurality of teeth are cut to form a shaft (210).
The rotation shaft (31) of the motor (300) provided on one side of
0). Therefore, the cam (220) and the first gear member (211) are formed integrally with the shaft (210) to form a camshaft.

On the other hand, the linear reciprocating means comprises a first gear member (211) of a shaft (210) and a second gear member (21) supported by a rotating shaft of the motor (300).
2) has been described as having an ohm shape in a pair of ohm gears. However, the linear reciprocating means is not limited to the above-described embodiment, and the linear reciprocating motion is performed with the rotation of the shaft (210). Provision to be made allows any number of other embodiments.

Further, the motor (300) is a motor E
Upon receiving logic from a CU (not shown), the motor (300) rotates according to conditions such as the speed of the vehicle and the number of revolutions of the engine, and the shaft (210) reciprocates linearly (in FIG. Move to).

Further, the cam (220) has a first section (221) having a cross-sectional area on one side and a second section (222) having a cross-sectional area on the other side having different sizes. First
The first nose portion (21a) of the cross section (221) of the
Are formed so that the phases of the second nose portions (22a) of the cross-sectional portions (222) of the above-mentioned portions are different from each other. In other words, the cam (220) has a second cross-section (222) larger than the first cross-section (221), and the second cross-section (222) extends from the first cross-section (221). ) Is twisted and stretched.

Next, the operation of the camshaft system having the above configuration will be described. The description of the operation of the conventional camshaft system will be omitted here, and only the operation associated with the features of the present invention will be described.

FIG. 2 is a schematic explanatory view for explaining the operation of the camshaft system according to the present invention.

Referring to FIG. 2, the shaft (21)
No. 0) is rotated by transmitting torque from an engine crankshaft (not shown), and the motor (300) is driven by a rotating shaft (310) provided on a rotating shaft (310) of the motor (300). 2 gear member (212) and shaft (210)
The first gear member (211) formed on the first gear member is engaged with the first gear member (211) so as to reciprocate linearly with the rotational movement.

On the other hand, as an ideal operating condition of a normal engine, the valve lift should be small at low speed (low RPM).
Since the valve overlap is reduced, the idling is stabilized, and the supply of the air-fuel mixture is small, so that the fuel consumption is reduced. Furthermore, at high speeds (high RPM), the valve lift should be large, and as the valve lift increases, the valve overlap increases, so that the efficiency of intake and exhaust increases, and the performance is improved. However, the supply amount of the air-fuel mixture is also increased, so that a sense of satisfaction can be obtained in operation associated with high-speed performance.

The camshaft system according to the present invention also satisfies such ideal operating conditions, and at a low speed, the first section (2) of the cam (220).
The motor (300) is transmitted with logic from the ECU of the vehicle so that the intake or exhaust valve (110) is brought into contact with 21) so that the shaft (210) reciprocates linearly. Accordingly, when the valve (110) comes into contact with the first section (221) of the cam (220) to operate, the valve lift is reduced. Further, similarly at high speed, the motor (30) is brought into contact with the valve (110) in the second section (222).
0), the shaft (210) reciprocates linearly,
The valve (110) is connected to the second section (2) of the cam (220).
22), the valve lift is increased. Therefore, the camshaft system according to the present invention can satisfy the ideal operating conditions of the engine as described above.

Further, the cam (220) formed on the shaft (210) has a first cross section (221) and a second cross section (222) that are different in size, and the first cross section (222) is different. Since the first section (221) of the cam (220) is advanced at a high speed because the first section (221) is advanced by being twisted from the second section (222) to the second section (222), the valve (1) is extended.
10) is quickly opened to supply a large amount of fuel, and at a low speed, the valve (110) is opened slowly to stabilize idle and save fuel.

[0025]

As described above, the camshaft system of the present invention has the following effects. First, the variable valve lift and the variable valve timing can be simultaneously realized by forming the cam of the camshaft so that the cross-sectional area and the phase of the nose part are different from each other, and providing a linear reciprocating means on one side of the camshaft. Therefore, there is an effect that improvement in fuel efficiency, stability of idle, satisfaction of high-speed desire, and the like can be achieved.

Although the present invention has been described with reference to an embodiment shown in the drawings, this is by way of example only, and those skilled in the art can now make various modifications and changes. It will be appreciated that equivalent embodiments are possible. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

[Brief description of the drawings]

FIG. 1 is a schematic partial perspective view showing a configuration of a camshaft system of the present invention.

FIG. 2 is a schematic explanatory view of a camshaft system for explaining the operation of FIG. 1;

[Explanation of symbols]

 21a first nose 22a second nose 100 cylinder head 110 valve 210 shaft 211 first gear member 212 second gear member 220 cam 221 first cross section 222 second cross section 300 -Ta 310 Rotation axis

Claims (3)

[Claims] 1. A shaft, a plurality of cams formed integrally with the shaft at a predetermined distance from the shaft, and a first gear member provided on one side of the shaft and having a plurality of teeth formed thereon And a second gear member having a plurality of teeth formed on one side of the camshaft so as to mesh with the teeth of the first gear member. A camshaft system comprising a motor capable of linearly reciprocating the motor. 2. The cam has a first cross-sectional area at one end and a second cross-sectional area at the other end which are different in size. 2. The camshaft system according to claim 1, wherein the phases of the second nose portions having a sectional area of 2 are formed to be different from each other. 3. The camshaft system according to claim 1, wherein the first gear member is formed integrally with the shaft on an outer peripheral surface of the shaft.