JPH0332729Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an intake control device for an engine in which an intake passage is provided with a rotary valve that sets the opening timing of the intake passage.

(Prior Art) Recently, various engines have been proposed in which a rotary valve is provided in the intake passage, and the opening timing of the intake passage is set by the rotary valve. There is one in which the opening timing of the rotary valve is adjusted according to the operating condition. As a means of adjusting this opening timing,
As seen in Publication No. 148932, a power transmission shaft separate from the rotating shaft of the rotary valve is disposed on the same axis as the rotating shaft, and a helical spline, for example, is carved on both shafts. It is known that a fitted adjustment member is moved in the axial direction to change the phases of the two shafts, thereby adjusting the opening timing of the rotary valve in accordance with the operating state.

In an engine equipped with such a timing adjustment means, the above-mentioned adjustment member should move smoothly on the above-mentioned two shafts so that the opening timing of the intake passage can be set according to a wide range of operating conditions. desired.

By the way, conventionally, the above-mentioned power transmission shaft is connected to the camshaft of the engine intake and exhaust valve via a winding mediating joint such as a timing belt, and this winding mediating joint is a winding mediating joint that transmits power from the crankshaft to the camshaft. It was supposed to be placed on the same side as the For this reason, the protruding end of the camshaft from its bearing is extended, and a pulley for the crank and a pulley for the rotary valve are arranged side by side around the protruding end, around which the winding intermediate joint between the shaft and the crankshaft is wound. Therefore, the projecting end of the camshaft had to be extended for a long time, and as a result, the projecting end was likely to run out.

(Problem to be solved by the invention) The vibration of the protruding end of the camshaft described above is transmitted to the power transmission shaft through the winding intermediate joint, and the power transmission shaft becomes eccentric from the axis of the rotation shaft of the rotary valve. Therefore, there is a possibility that the smooth movement of the adjustment member described above may be hindered.

The technical problem of the present invention is to control the amount of protrusion of the camshaft from its bearing in an engine intake control device in which the opening timing of the intake passage is adjusted according to the operating condition by the above-mentioned adjustment means. The vibration of the protruding end of the camshaft is minimized by allowing the setting to be as small as possible.
The object of the present invention is to improve the reliability of the operation of the timing adjusting means by preventing the power transmission shaft from being eccentric from the rotating shaft.

(Means for Achieving the Technical Problem) In the present invention, the power transmission member that transmits power from the engine output shaft to the camshaft is disposed, and at the other end of the camshaft opposite to the one end where the power transmission member that transmits power from the engine output shaft to the camshaft is arranged, Focusing on the fact that the camshaft has a high degree of freedom, a rotary valve drive system is installed on the other end of the camshaft to eliminate vibration of the protruding end of the camshaft. Bearings for the power transmission shaft and the rotary shaft of the rotary valve, which are linked together, are provided in an integrally formed casing, thereby preventing the power transmission shaft from being eccentric from the axis of the rotary shaft. It is something.

(Example) Hereinafter, an example in which the present invention is applied to a partially supercharged engine will be described based on the attached drawings.

In FIG. 1, 1 is an engine body, and the engine body 1 is of an in-line four-cylinder OHC type. In addition to the main intake port and exhaust port (not shown), a supercharging port 2 opens in each combustion chamber of the engine body 1, and the main intake port is opened by the main intake valve, the exhaust port is opened by the exhaust valve, and the supercharging port 2 is opened.
are opened and closed by auxiliary valves, and the opening and closing of each of the above valves is controlled by a timing cam disposed on the camshaft 3. The camshaft 3 has a pulley 4 provided at one end protruding from a bearing (not shown), and is connected to the crankshaft (not shown) via a winding medium 5 such as a timing belt or chain wound around the pulley 4. power is transmitted, and each of the valves is opened and closed in synchronization with the rotation of the crankshaft.

A supercharging passage 6 is connected to the supercharging port 2, and a rotary valve device 7 is disposed in the supercharging passage 6, and a supercharger (not shown) is disposed upstream of the rotary valve device 7.

The rotary valve device 7 includes a casing 8 attached to the side wall of the engine body 1, and a casing 8 attached to the side wall of the engine body 1.
Its basic elements are a rotor 9 rotatably housed within the rotor 9 and a timing adjustment means 10.

The casing 8 consists of a main body part 8a and a bearing part 8b, the main body part 8a has a substantially cylindrical shape extending parallel to the axis of the camshaft 3, and the main body part 8a has one flow connected to a supercharger (not shown). An inlet 11 is formed. The inlet 11 and the outlet 12 are connected to the main body 8
The inlet port 1 is opened to the internal space (valve chamber) 13 of the
1 is opened on the crank pulley 4 side described above. Each outlet 12 communicates with each supercharging port 2 described above.

The rotor 9 has a cylindrical shape with a bottom, and is rotatably fitted into the main body 8a with its opening 14 facing the inlet 11. The rotor 9 has 4 rotors according to the number of cylinders.
The two communicating holes 15 are spaced apart from each other in the axial direction of the rotor 9 and are shifted by 90 degrees from each other in the circumferential direction. As a result, inlet 1
1 into the internal space of the main body portion 8a, that is, into the valve chamber 13, the supercharging air flows into the supercharging port 2 corresponding to the matching outlet port 12 only when the outlet port 12 and the communication hole 15 match. Supply air is supplied.

The rotor 9 is rotatably supported by the main body 8a via a bearing 16 at the end on the side of the opening 14 (the right end in FIG. 1), and at the other end (the left end in FIG. 1),
As shown in FIG. 2, a rotating shaft 1 is connected to the bottom wall 17 of the rotor 9 and extends along the axis of the rotor 9.
8 is provided, and the rotating shaft 18 and the power transmission shaft 19 are arranged in series with the rotating shaft 18, that is, the rotating shaft 18 and the power transmission shaft 19 are arranged so that their axes coincide with each other. Both shafts 18 and 19 are rotatably supported by bearing portions 8b via bearings 20, respectively, and the integrally formed bearing portion 8b ensures that both shafts 18 and 19 are arranged on the same axis. Moreover, the power transmission shaft 19 is prevented from running out by two bearings 20, 20 arranged in parallel. A space 21 is formed in the bearing portion 8b, and a timing adjustment means 10 is disposed within this space 21.

As shown in FIG. 2, the timing adjustment means 10 includes helical splines 22 and 23 formed at opposite ends of the shafts 18 and 19, respectively. As another component, it has an adjustment piece 24 extending across both shafts 18 and 19,
The adjustment piece 24 has a helical spline 2 at each end thereof.
2 and 23, and this adjustment piece 24 is rotatably supported by a ring member 25 via a bearing 26. For this reason, the adjustment piece 24 is
8 and 19, the two shafts 18 and 19 are linked together, and the adjustment piece 24 moves in the axial direction, thereby adjusting the phase of the two shafts 18 and 19 in cooperation with the helical splines 22 and 23. will change. The adjustment piece 24 is moved by an actuating member A that is swingably supported on the bearing main body 8b by a shaft a, and this actuating member A is swung according to, for example, the engine load. By changing the phases of both shafts 18 and 19, the opening timing of the rotary valve device 7 can be adjusted according to the operating condition of the engine, that is, the advance angle can be adjusted. .

The drive system of the rotary valve device 7 configured as described above is disposed on the opposite side of the engine body 1 from the side on which the above-described crank pulley 4 is disposed. That is, the pulley 27 is attached to the protruding end of the power transmission shaft 19 that protrudes from the bearing portion 8b, and on the other hand, the camshaft 3 is attached to the engine on the side opposite to the attachment side of the crank pulley 4, that is, on the other end side. A rotary valve pulley 28 is protruded from the main body 1, and a rotary valve pulley 28 is attached to its protruding end (the left end in FIGS. 1 and 2).
A winding agent 29 such as a timing belt is wound around the belt 8 . Since no other auxiliary equipment is attached to the side of the camshaft 3 where the rotary valve pulley 28 is attached, the extended end 30 of the camshaft 3 has almost the entire length covered by the casing 32 that protrudes from the rear housing 31. The extended end portion 30 of the camshaft 3 is supported by the casing 32 via a bearing 33 at a position close to the rotary valve pulley 28.

Since the distance between the protruding end of the camshaft 3 to which the rotary valve pulley 28 is attached and the bearing 33 is extremely short, the deflection of the protruding end,
In other words, the occurrence of radial deflection of the camshaft 3 is prevented as much as possible. Therefore, the winding mediating joint 29 interposed between the camshaft 3 and the power transmission shaft 19 does not cause runout or radial vibration of the power transmission shaft 19, and the camshaft 3 and the power transmission shaft 19 are integrally formed. Since the power transmission shaft 19 and the rotation shaft 18 are firmly supported by the bearing portion 8b, the two shafts 18 and 19 are reliably maintained on the same axis, and the adjustment piece 24 The timing adjustment means 10 ensures smooth movement of the timing adjustment means 10.
The reliability of operation can be improved. that's all,
Although the present invention has been described with reference to a case where it is applied to a partially supercharged engine, it goes without saying that it can also be applied to a normal engine that does not perform supercharging. That is, the opening timing of the intake passage may be set using a rotary valve.

(Effects of the invention) As is clear from the above, the invention has the following effects:
Eccentricity of the power transmission shaft is prevented, and the reliability of the timing adjustment means can be improved.

[Brief explanation of the drawing]

Figure 1 is an overall view showing one embodiment of the present invention;
The figure is a plan sectional view showing details of the timing adjustment means. 1: Engine body, 3: Camshaft, 4: Crank pulley, 6: Supercharging passage, 7: Rotary valve, 8: Main body, 8b: Bearing part casing, 1
0: Timing adjustment means, 18: Rotating shaft, 19:
Power transmission shaft, 22, 23: helical spline,
24: Adjustment piece, 29: Winding mediating clause.

Claims (1)

[Claims for Utility Model Registration] A rotary valve device is provided in an intake passage of an engine and is rotationally driven by a camshaft of an engine intake/exhaust valve via a winding intermediate node to set the opening timing of the intake passage. , the rotary valve device includes a rotating shaft of the rotary valve, a power transmission shaft that is provided on the same axis as the rotating shaft and linked to the camshaft via the winding intermediate joint, and a power transmission shaft that is fitted onto both the shafts. and an adjustment member that changes the phase of the two shafts by moving in the axial direction of the two shafts, and the opening timing of the intake passage is adjusted by the adjustment member according to the operating state. In the intake air control device for an engine, the winding intermediate node is disposed at the other end of the camshaft opposite to the one end of the camshaft where a power transmission member for transmitting power from the engine output shaft to the camshaft is disposed. An intake air control device for an engine, characterized in that bearings for the rotating shaft and the power transmission shaft are provided in an integrally formed casing.