JPH10252420A - Valve opening and closing timing controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a coil spring from protruding to the inside of an engine so as to improve the assembly property by arranging a coil spring which energizes a vane in a fluid chamber in the predetermined direction when the engine stops on the outside opposite to an internal combustion engine. SOLUTION: Since oil pressure inside a restoration chamber and an operation chamber in an external rotor 50 is reduced when an engine stops, a lock pin 60 is locked in a condition of the most delayed angle at which the volume of the restoration chamber becomes the maximum by a coil spring 92 provided on the outside of the engine. In this condition, the relative rotation between members on the shaft side including a cam shaft 10, an internal rotor 30, and a vane 40 and rotation transmission members such as an external rotor 50, a timing pulley 70, etc., is regulated. After that, when the engine is started and oil is supplied, locking by means of the lock pin 60 is released against the coil spring 92, the members on rotary shaft side and the rotation transmission members are relatively rotated, and valve opening and closing timing is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing control device for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, many valve opening / closing timing controllers for controlling the timing between a timing pulley and a camshaft have been introduced, and as one example, a vane type valve opening / closing timing controller is known.

For example, there is a vane type valve timing control apparatus disclosed in Japanese Patent Application Laid-Open No. 1-92504 (hereinafter, referred to as a first technique).

The technique disclosed in this publication is described with reference to FIGS.
Referring to FIG. 9, which is a cross-sectional view taken along line AA of FIG. 9, reference numeral 101 denotes a timing pulley which is driven by a crank pulley of an internal combustion engine (not shown), and the rotational force is transmitted by an annular belt, an annular chain, a gear, or the like. . 104
Is supported by a cylinder head 114 of the engine by a camshaft, and the vane 102 is fixed to the camshaft 104 via an internal rotor 103. Also, the inner peripheral portion 101a of the timing pulley of the timing pulley 101
Is formed with a partition wall 101b.
A hydraulic chamber 108 is formed between b and 101b. The vanes 102 are inserted into the hydraulic chambers 108, respectively.
The pressure working chamber 10 is formed by the vane 102 and the outer plate 105.
9, 109a are formed, and the outer plate 105 is positioned by the plate 121 and the fixing bolt 120. That is, the camshaft 104 including the vane 102
The side and the side of the timing pulley 101 including the hydraulic chamber 108 are rotatably supported. Further, this relative rotation is achieved by rotating the vane 2 within the range of the hydraulic chamber 108 provided on the inner peripheral portion of the timing pulley, and the angle can be rotated by the angle θ shown in FIG. Camshaft 104 and timing pulley 101
Is performed by rotating the vane 102 by hydraulic pressure sucked and discharged to the pressure working chambers 109 and 109a provided on both sides of the vane 102. In addition,
With respect to the rotation direction indicated by the arrow in FIG. 9, the pressure working chamber 109 is located upstream of the vane 102 and the pressure working chamber 109 a is located downstream of the vane 102. This hydraulic pressure is controlled by a switching valve 115 using an oil pump (not shown) as a hydraulic pressure source. This switching valve 11
Reference numeral 5 denotes a valve which slides the valve spool 118 rightward in the figure against the spring 116 by energizing the solenoid 113. The oil discharged from the oil pump is taken into the switching valve 115 from the oil passage 112, and Hydraulic working chamber 1 on both sides of vane 2 via paths 110, 111
09, 109a is adjusted.

In operation of the first technique having such a structure, the oil passage 110 communicates with the pressure operating chamber 109 and the oil passage 11
1 communicates with the pressure working chamber 109a. Switching valve 1
When oil is supplied to the oil passage 110 to increase the oil pressure in the pressure working chamber 109, the vane 102 rotates in the direction indicated by the arrow in FIG. The camshaft 104 can be advanced by opening and closing timing of an intake valve or an exhaust valve that opens and closes as the camshaft 104 rotates. Conversely, when the switching valve 115 is controlled to supply oil to the oil passage 111 and increase the oil pressure in the pressure working chamber 109a, the vane 102 rotates in the direction opposite to the arrow in FIG. Pulley 10
1 can be delayed by the rotation of the vane 102, and the opening / closing timing of an intake valve or an exhaust valve that opens and closes with the rotation of the camshaft 104 can be delayed.

[0006] The applicant of the present invention has disclosed Japanese Patent Application No. Hei 8 (1998) -197, as an application for solving the problem when the valve opening / closing timing control device of the first technique is attached to a camshaft which opens and closes an exhaust valve.
-74823 (hereinafter referred to as "second technology"). A second technology is a rotation transmission member which is provided on a camshaft for opening and closing a valve so as to be relatively rotatable in a predetermined range and transmits rotation power of an internal combustion engine, and a vane attached to one of the camshaft or the rotation transmission member. A fluid pressure chamber disposed between the camshaft and the rotation transmitting member and divided into two pressure working chambers by vanes, a passage for supplying and discharging fluid to each of the two pressure working chambers, and one end connected to the camshaft. And a coil spring engaged at the other end with the rotation transmitting member. In the second technique, with this configuration, the internal combustion engine is stopped, and when the fluid pressure in the two pressure working chambers decreases to a level where the vane position cannot be held in the fluid pressure chamber, the position of the vane is adjusted by the urging force of the coil spring. Can be set at a desired position.

[0007]

However, in the above second technique, the position of the coil spring is arranged between the cylinder head portion of the engine and the valve timing control device, and the coil spring is arranged. The projecting portion projects toward the engine, so that the valve opening / closing timing control device cannot be made thin. In addition, disposing the coil spring at this position causes a trouble in mounting the coil spring, and there is a problem that it takes time to assemble the valve timing control device.

The present invention discloses a valve timing control apparatus which solves the above-mentioned problems.

[0009]

In order to solve the above-mentioned problems, the present inventors stop the engine and urge the vanes in the fluid chamber in a predetermined direction when the fluid pressure in the fluid chamber decreases. The focus was on arranging the coil spring on the outside to make it easy to assemble. Furthermore, the present inventors have focused on the fact that the number of members can be reduced by guiding the coil spring by a sensor plate attached to the camshaft and sensing a position where the camshaft is rotating.

[0010] The means adopted in the first aspect of the present invention are a rotation transmission member externally rotatable relative to a rotation shaft for opening and closing the valve within a predetermined range and transmitting the rotation power of the internal combustion engine, a rotation shaft or a rotation transmission member. And a fluid pressure chamber disposed between the rotating shaft and the rotation transmitting member and divided into a working chamber and a return chamber by the vane, and supplying and discharging fluid to each of the working chamber and the return chamber. In a valve timing control apparatus comprising a passage and a coil spring having one end engaged with a rotating shaft and the other end engaged with a rotation transmitting member, the coil spring is disposed outside the internal combustion engine.
With such a configuration, it is possible to provide a valve opening / closing timing control device that can easily be assembled without the coil spring protruding inside the engine.

According to a second aspect of the present invention, the coil spring is guided by a sensor plate attached to the end of the rotating shaft. With this configuration, the coil guide can be mounted without newly adding a member by using the sensor plate conventionally mounted on the rotating shaft as a spring guide. Furthermore, by disposing the coil spring at this position, even if the load required for the coil spring differs depending on the type of engine, the coil spring can be simply replaced without greatly changing the structure of the valve timing control device. It is possible to respond by changing or changing the load of the coil spring.

According to a third aspect of the present invention, the sensor plate includes a sensor portion extending perpendicular to the rotation axis and a flange extending in the direction of the rotation axis. This is a configuration for guiding. With such a configuration, the coil spring can be reliably held, and operation failure of the coil spring can be prevented. Further, it is possible to prevent a problem that the urging force becomes non-uniform due to a twist of the coil spring or the like.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention will be described with reference to the drawings.

The valve timing control apparatus according to the present invention shown in FIG. 1 is mounted on a camshaft (rotating shaft) 10, a sensor plate 12 for detecting the rotational position of the camshaft 10, an internal rotor 30, and an internal rotor 30. 40 vanes
A rotary shaft side member for opening and closing a valve, and an external rotor 5 externally mounted on the rotary shaft side member so as to be relatively rotatable within a predetermined range.
The camshaft 10 is rotatably instructed to the cylinder head 80 of the internal combustion engine on the outer periphery of the camshaft 10. The timing pulley 7
As shown in FIG. 2, the rotation of the crankshaft (not shown) is transmitted through a timing belt in a counterclockwise direction as indicated by arrows in FIGS.

The camshaft 10 has a cam for opening and closing an exhaust valve (not shown), and a single supply / discharge passage 11 for operating hydraulic pressure (a hydraulic pressure whose valve opening / closing timing is advanced) is provided at the shaft center. A plurality of supply / discharge passages 12 of a return hydraulic pressure (a hydraulic pressure whose valve opening / closing timing is retarded) are provided in parallel with the supply / discharge passage 11. The supply / discharge passage 11 for operating hydraulic pressure communicates with a supply / discharge passage 81 provided in the cylinder head 80 via a radial passage 13 provided in the camshaft 10 and an annular passage 14. The return hydraulic pressure supply / discharge passage 12 communicates with a supply / discharge passage 82 provided in the cylinder head 80 via an annular passage 15 provided in the camshaft 10. As is well known, the supply / discharge passages 81 and 82 are selectively connected by an oil pump (not shown) driven by the internal combustion engine via a switching valve (not shown) whose switching operation is controlled according to the driving state of the internal combustion engine. It is configured as follows.

The inner rotor 30 is integrally fixed to the camshaft 10 together with the sensor plate 20 by bolts 90, and as shown in FIGS. 4 to 7, a plurality of vane grooves for attaching the plurality of vanes 40 in the radial direction. 3
1, and locked when the relative phases of the rotation shafts such as the camshaft 10 and the rotation shaft such as the internal rotor 30 and the external rotor 50 and the timing pulley 70 are synchronized at a predetermined phase. The head of the pin 60 has a receiving hole 32 into which a predetermined amount is inserted. Each of the vanes 40 is urged radially outward by a spring 41 housed in the bottom of the vane groove 31.

As shown in FIG. 2, the sensor plate 20 has sensor projections 21, 22, 23, and 24 projecting radially outward, and only the sensor projection 24 has a larger circumferential length. The rotation state of the camshaft 10 can be detected by reading the positions (rotation states) of the sensor protrusions 21 to 24 with a sensor (not shown). As shown in FIG. 1, a flange 25 extending in the axial direction of the camshaft 10 is formed integrally with the sensor plate 20.

The outer rotor 50 is mounted on the outer periphery of the inner rotor 30 so as to be rotatable relative to a predetermined range, and as shown in FIG.
0 are integrally connected by bolts 91. Bolts 91 penetrate through holes 53 provided at predetermined intervals in external rotor 50, and are connected to side plate 71 and timing pulley 70.
Are integrated with the external rotor 50. The outer rotor has a recess 51 which accommodates the vane 40 and forms a fluid pressure chamber Ro divided by the vane 40 into a return chamber R1 and a working chamber R2 by the outer periphery of the inner rotor 50. An evacuation hole 52 for accommodating a pin 60 and a spring 61 for urging the pin 60 toward the inner rotor 30 is formed in the radial direction of the outer rotor 50.

As shown in FIG. 1, one end is engaged with the side plate 71 and the other end is engaged with the internal rotor between the side plate 71 integrally attached to the outer rotor 50 and the inner rotor 30. A coil spring 92 is provided. The coil spring 92 includes the external rotor 50, the timing pulley 7,
The camshaft 10, the internal rotor 30, and the vane 40 are urged counterclockwise in FIG. The coil spring 92 is guided on the inner peripheral side of the coil portion by the flange 25 of the sensor plate 20.

The lock pin 60 is fitted in the evacuation hole 52 so as to be movable in the radial direction of the outer rotor 50, is urged toward the inner rotor 30 by a spring 61, and has a head (an inner peripheral end). Part) can be inserted into and retracted from the receiving hole 32. The spring 61 is a compression spring interposed between the lock pin 60 and the retainer 62,
The retainer 62 is detached by a clip 63 attached to the external rotor.

In the valve timing control apparatus according to the present embodiment, the internal combustion engine is stopped, oil is not supplied from the oil pump (not shown) to the supply / discharge passages 81, 82, and the return chamber R1, When the oil pressure inside the working chamber R2 decreases, the lock pin 60 is locked by the urging force of the coil spring 92 in the state shown in FIGS. 1 and 4 (in the most retarded state where the volume of the return chamber R1 is maximized). State). Therefore, when the internal combustion engine is started, the camshaft 10 and the internal rotor
Unnecessary relative rotation of the rotation shaft side member such as the plurality of vanes 40 and the rotation transmission members such as the external rotor 50, the timing pulley 70 and the side plate 71 is regulated, and unnecessary rotation of the rotation shaft side member and the rotation transmission member is restricted. Problems with relative rotation (for example,
It is possible to prevent the sound of the vane 40).

At the time of the start, oil is supplied from the oil pump to the supply / discharge passage 81 via the switching valve for at least a predetermined time, so that the annular passage 14, the passage 13, and the supply / discharge passage 11 of the camshaft 10 Internal rotor 30
Of the return chamber R1 and the receiving hole 3 through the connection passages 34 and 35 of FIG.
2 is supplied with oil, a predetermined time (time until the pressure of the oil supplied to the receiving hole 32 through the connection passage 35 rises) from the start of the internal combustion engine has elapsed, and as shown in FIG. Thus, the oil pressure of the oil in the receiving hole 32 retreats the lock pin 60 to the retreat hole 52 against the spring 61, and the lock by the lock pin 60 is released. Reference numeral 36 in FIGS. 4 to 7 denotes a connection passage for supplying and discharging oil to and from the working chamber R2 via the supply / discharge passage 82, the annular passage 15, and the supply / discharge passage 12.

Therefore, after a lapse of a predetermined time from the start of the start of the internal combustion engine, as shown in FIG.
0, a rotating shaft side member such as the inner rotor 30 and the outer rotor 5
0, the rotation transmitting member such as the timing pulley 70 can be relatively rotated, and the oil is discharged from the return chamber R1 and supplied to the working chamber R2 with the switching operation of the switching valve according to the driving state of the internal combustion engine. As a result, the rotation shaft side members such as the camshaft 10 and the internal rotor 30 and the rotation transmitting members such as the external rotor 50 and the timing pulley 70 are relatively rotated, and from the state of FIG. 5 to the state of FIG. (Retarded state). Also, the working chamber R2
And oil to the return chamber R1 to supply the rotation shaft side members such as the camshaft 10, the internal rotor 30, the external rotor 50, the timing pulley 70, and the like.
The relative rotation of the constant rotation transmission member is performed, and the state shown in FIG.
The state shown in FIG. 5 (the most advanced state) can be obtained through the above state, and the opening / closing timing of the intake valve of the internal combustion engine can be accurately controlled.

As described above, in the valve timing control apparatus of this embodiment, when the internal combustion engine stops and the oil pressure in the return chamber R1 and the working chamber R2 decreases, the opening and closing of the exhaust valve is controlled by the urging force of the spring 92. The camshaft 10 can be set to the most advanced state, so that the exhaust valve and the intake valve do not open at the same time when the combustion state at the start of the internal combustion engine is unstable. That is, since the opening / closing timing of the exhaust valve is set to the most advanced state by the valve opening / closing timing control device according to the present embodiment, the intake valve is opened by another camshaft in the intake process which is the process next to the exhaust process in which the exhaust valve is opened. Is opened after the exhaust valve is closed, the exhaust valve and the intake valve are simultaneously opened, and the combustion gas is supplied from the intake valve to the inside of the internal combustion engine in an unstable state when the internal combustion engine is started. The problem that the air-fuel mixture is directly discharged from the exhaust valve via the internal combustion engine can be prevented. Further, since the coil spring is provided on the side plate 71 side opposite to the cylinder head 80 of the internal combustion engine, there is no need for a protruding member for accommodating the coil spring between the timing pulley 70 and the cylinder head 80. . Further, since the inner circumference of the coil portion of the coil spring 92 is guided by the flange portion 25 of the sensor plate 20, the coil spring 92 can be reliably held, and occurrence of operation failure can be prevented.

In the above embodiment, the lock pin 6
Although a connection passage 35 for supplying oil to the receiving hole 32 for retreating 0 is communicated with the connection passage 34, control of a switching valve (not shown) at the time of starting the internal combustion engine is changed.
It is also possible to connect the connection passage 35 with the connection passage 36 by first supplying oil to the supply / discharge passage 82 when the engine is started.

[0026]

According to the first aspect of the present invention, there is provided a rotation transmitting member which is rotatably mounted in a predetermined range on a rotary shaft for opening and closing a valve and which transmits the rotational power of the internal combustion engine, and a rotary shaft or a rotary shaft. A vane attached to one of the transmission members, a fluid pressure chamber disposed between the rotating shaft and the rotation transmission member and divided into a working chamber and a return chamber by the vane, and supplying fluid to each of the working chamber and the return chamber. In a valve opening / closing timing control device comprising a discharge passage and a coil spring having one end engaged with a rotating shaft and the other end engaged with a rotation transmitting member, the coil spring is disposed outside facing the internal combustion engine. Without the coil spring protruding inside the engine,
A valve opening / closing timing control device that can be easily assembled can be provided.

According to the second aspect of the present invention, the coil spring is guided by the sensor plate attached to the end of the rotating shaft, so that the sensor plate conventionally attached to the rotating shaft can be guided by the spring guide. By doing so, the coil spring can be attached without newly adding a member. Furthermore, by disposing the coil spring at this position, even if the load required for the coil spring differs depending on the type of engine, the coil spring can be simply replaced without greatly changing the structure of the valve timing control device. It can be handled by changing the load or changing the load of the coil spring.

According to the third aspect of the present invention, the sensor plate includes the sensor portion extending perpendicular to the rotation axis and the flange extending in the rotation axis direction, and the flange guides the side of the coil spring. With the configuration, the coil spring can be securely held, and the occurrence of operation failure of the coil spring can be prevented. Further, it is possible to prevent a problem that the urging force becomes non-uniform due to a twist of the coil spring or the like.

[Brief description of the drawings]

FIG. 1 shows a cross section of a valve timing control apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view from the left side in FIG. 1;

FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1;

FIG. 4 is a vertical sectional front view showing a relationship among an inner rotor, an outer rotor, a vane, a lock pin and the like shown in FIG. 1;

FIG. 5 is an operation explanatory view in which the lock pin shown in FIG. 4 is retracted into a retract hole.

6 is an operation explanatory view showing a state in which the rotation shaft side member has been slightly rotated clockwise relative to the rotation transmission side member from the state shown in FIG. 5;

FIG. 7 is an operation explanatory view showing a state in which the rotation shaft side member is further rotated clockwise relative to the rotation transmission side member by a predetermined amount from the state shown in FIG. 6;

FIG. 8 is a cross-sectional view of a prior art valve timing control apparatus according to the present invention.

FIG. 9 is a cross-sectional view taken along line AA of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Camshaft (rotation axis) 20 ... Sensor plate 25 ... Flange part 40 ... Vane 50 ... External rotor (rotation transmission member) 11, 13, 34, 81 ... Return chamber 12, 36, 82 ... passage communicating with the working chamber 92 ... coil spring R1 ... return chamber R2 ... working chamber Ro ... fluid pressure chamber

Claims (3)

[Claims] A rotation transmission member externally rotatably mounted within a predetermined range on a rotation shaft for opening and closing a valve to transmit rotation power of an internal combustion engine, and a vane attached to one of the rotation shaft or the rotation transmission member. A fluid pressure chamber disposed between the rotation shaft and the rotation transmitting member and divided into a working chamber and a return chamber by the vane, and a passage for supplying and discharging fluid to each of the working chamber and the return chamber. A valve opening / closing timing control device including a coil spring having one end engaged with the rotating shaft and the other end engaged with the rotation transmitting member, wherein the coil spring is disposed outside the internal combustion engine. A valve opening / closing timing control device. 2. The valve timing control device according to claim 1, wherein the coil spring is guided by a sensor plate attached to an end of the rotating shaft. 3. The sensor plate according to claim 1, wherein the sensor plate includes a sensor portion extending perpendicularly to a rotation axis and a flange portion extending in a rotation axis direction, and the flange portion guides a side portion of the spring. The valve timing control apparatus according to claim 2.