JP2000337112A - Valve timing changing device for internal combustion engine - Google Patents

Abstract

(57) [Problem] To provide a valve timing changing device for an internal combustion engine, which is capable of quickly operating an engagement member of a rotation restricting means, and capable of quickly restricting and canceling a change in valve timing. SOLUTION: A vane member 30 which rotates together with a camshaft 1 is accommodated in a housing member 18 which rotates together with a sprocket 17, and a relative rotation means 31 is formed.
An engaging member 47 which is provided in an engaging hole 48 formed in the housing member 18 and a cylinder hole 45 formed in the vane member 30 so that the tip can be engaged with the engaging hole 48.
Thus, the rotation restricting means 44 for restricting the relative rotation between the housing member 18 and the vane member 30 is formed. In the engaging member 47 of the rotation restricting means 44, recessed holes 52A, 52B are formed at both ends in the axial direction, and the recessed holes 52A, 52B are formed.
A non-hollow portion 53 was formed between B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing changing device for changing the opening / closing timing of an intake valve or an exhaust valve during operation of an internal combustion engine.

[0002]

2. Description of the Related Art This type of valve timing changing device is
A rotary shaft driven by a crankshaft of an internal combustion engine and a camshaft for driving an intake valve or an exhaust valve are provided. The opening and closing timing is changed.

For example, Japanese Patent Application Laid-Open No. 1-92504 discloses that
A housing that rotates with a sprocket (rotator) that is rotated by a crankshaft of the internal combustion engine, a rotor that is housed in the housing, and that rotates with the camshaft, and is provided on the rotor so as to protrude in a radial direction;
There is shown a valve timing changing device that includes a plurality of vanes forming a plurality of hydraulic oil chambers in a housing, and sucks and discharges hydraulic oil into the hydraulic oil chamber to relatively rotate the housing and the rotor. .

Further, the valve timing changing device is provided with a rotation restricting means for restricting the relative rotation between the housing and the rotor. The rotation restricting means is provided slidably with a knock pin as an engagement member in the housing,
The knock pin is urged in a centrifugal direction by the spring force of the spring member and inserted into a hole provided in the rotor, thereby connecting the housing and the rotor to regulate a change in valve timing, and at the same time, restricting the knock pin to hydraulic fluid. By extruding from the inside of the hole by pressure, the connection between the housing and the rotor is released, and the restriction on the change of the valve timing is released.

[0005]

In the prior art, the knock pin (engagement member) of the rotation restricting means restricts the relative rotation between the rotating body and the camshaft, thereby preventing the rotation of the housing and the rotor. Because it receives a shearing force in the direction perpendicular to the axis, it is formed in a non-hollow shape in order to secure mechanical strength that can withstand this shearing force.

Therefore, the inertial mass of the knock pin (engaging member) is increased, and there is a possibility that the operational response of the knock pin is deteriorated. In particular, in the case of a configuration in which the knock pin moves in the radial direction to regulate the relative rotation between the housing and the rotor, the knock responsiveness may be affected by the centrifugal force, and the operation responsiveness may be deteriorated.

The present invention has been devised in view of the above-mentioned conventional circumstances, and enables the quick operation of the engagement member of the rotation restricting means, thereby quickly regulating and releasing the change of the valve timing. It is an object of the present invention to provide a valve timing changing device for an internal combustion engine, which is provided with a rotation restricting means that can perform the rotation.

[0008]

SUMMARY OF THE INVENTION Therefore, the invention according to claim 1 is provided between a rotating body that is rotated in synchronization with an internal combustion engine and a cam shaft that drives an intake valve or an exhaust valve, and It is possible to change the opening / closing timing of the intake valve or the exhaust valve by rotating the cam shaft relative to the body,
In a valve timing changing device for an internal combustion engine provided with a rotation restricting means for restricting relative rotation between a rotating body and a camshaft, a housing member rotating with one of the rotating body and the camshaft; A rotating member and a vane member that rotates together with one of the camshaft and a rotating member. The rotating member includes a housing member or a vane member. An engaging hole formed in any one of the above, and an engaging member which is provided so as to be able to protrude and retract in a cylinder hole radially formed in the housing member or the vane member, and a tip of which can be engaged with the engaging hole. , Equipped with
The engaging member is provided with a hollow at both ends in the axial direction, and a non-hollow portion is formed between the hollows.

According to a second aspect of the present invention, in the configuration of the first aspect, the non-hollow portion formed in the rotation restricting means has a front end of the engaging member engaged with an engaging hole. In this state, it is arranged in the cylinder hole and the engagement hole.

According to a third aspect of the present invention, in the configuration of the first aspect, the engaging member of the rotation restricting means is formed of a light alloy material.

According to a fourth aspect of the present invention, in the configuration of the first aspect of the invention, the inner peripheral surface and the bottom surface of the recess formed in the engaging member of the rotation restricting means are smoothly connected. Configuration.

According to a fifth aspect of the present invention, in the configuration of the first aspect of the present invention, the size of the recess formed in the engagement member of the rotation restricting means is larger at the opening end side than at the bottom side. , Formed in a tapered shape.

According to a sixth aspect of the present invention, in the configuration of the first aspect, at least one of the two recessed holes formed in the engagement member of the rotation restricting means is provided. The groove is formed substantially in the axial direction of the peripheral surface.

According to a seventh aspect of the present invention, in the configuration of the first aspect, the engagement member of the rotation restricting means is provided in a substantially radial direction substantially perpendicular to the axial direction of the camshaft. Configuration.

According to an eighth aspect of the present invention, in the configuration of the first aspect, the engagement member of the rotation restricting means is provided substantially in the axial direction substantially parallel to the axial direction of the camshaft. Configuration.

In this configuration, the rotating body is rotated in synchronization with the internal combustion engine, and the camshaft is rotated via the valve timing changing device. Thereby, the camshaft drives the intake valve or the exhaust valve.

The relative rotation of the camshaft with respect to the rotating body includes a housing member that rotates with one of the rotating body and the camshaft, and a vane member that rotates with one of the other. The operation is performed by sucking and discharging the hydraulic oil to the rotating means and relatively rotating the housing member and the vane member. In this case, the suction and discharge of the hydraulic oil to and from the hydraulic oil chamber can be controlled by a hydraulic control device.

By rotating the camshaft relative to the rotating body, the rotation phase of the camshaft is changed, and as a result, the opening / closing timing of the intake valve or the exhaust valve is changed.

Here, immediately after the start of the internal combustion engine or the like, the engaging member of the rotation restricting means protrudes from the cylinder hole by centrifugal force and / or spring force or the like, and its tip engages with the engaging hole. I have. For this reason, the rotating body and the camshaft are maintained in a predetermined engagement state by the engagement member, and rotate integrally. This state is a state in which the relative rotation between the rotating body and the camshaft is regulated by the rotation regulating means, and the change in the valve timing is regulated.

Next, by moving the engaging member of the rotation restricting means, the tip of the engaging member is detached from the engaging hole, and the engagement between the engaging member and the engaging hole is released.

The engagement of the rotation restricting means can be released by supplying hydraulic oil into an engagement hole with which the engagement member engages. That is, when the operating oil is supplied into the engaging hole, the operating oil acts on the engaging member, and the engaging member is urged against the centrifugal force and / or the spring force, and You will be pushed out from within. As a result, the tip of the engagement member is disengaged from the engagement hole, and the engagement is released.

Thus, the housing member and the vane member are released from the restraint by the engagement member of the rotation restricting means, and are supplied to the relative rotation means constituted by the housing member and the vane member. The operating oil pressure causes the housing member and the vane member to relatively rotate, and changes the rotation phase of the camshaft with respect to the crankshaft. Thereby, the opening / closing timing of the intake valve or the exhaust valve driven by the camshaft is changed.

Here, the engaging member of the rotation restricting means is
Since a hollow is provided at both ends in the axial direction, and a non-hollow portion is formed between the hollows, the weight is reduced.

For this reason, the inertial mass of the engagement member is reduced, and the operation responsiveness when the engagement member performs the engagement operation and the disengagement operation is improved.

Therefore, the valve of the internal combustion engine is provided with a rotation restricting means capable of promptly operating the engaging member of the rotation restricting means, and rapidly controlling and releasing the change of the valve timing. A timing change device is obtained.

Further, the weight of the engaging member of the rotation restricting means is reduced by providing concave holes on both ends in the axial direction. Therefore, a concave hole is formed on one side in the axial direction to reduce the weight. The depth of the pit can be made shallower than in the case where it is performed. For this reason, it is possible to facilitate the processing of the recessed hole and reduce the weight of the engaging member.

According to the second aspect of the present invention, the non-hollow portion formed in the engaging member is provided with the cylinder hole and the engaging hole when the tip of the engaging member is engaged with the engaging hole. Since it is arranged in the hole, when the engaging member is substantially sheared in the direction perpendicular to the axis by the housing member and the vane member, the same mechanical strength as when the entire engaging member is solid is provided. Can be secured.

According to the third aspect of the present invention, since the engaging member is formed of a light alloy material, the weight of the engaging member can be further reduced.

In the invention according to claim 4, since the inner peripheral surface and the bottom surface of the hollow formed in the engaging member are smoothly connected, the hollow is formed by plastic working such as forging. In the case of forming, the working life of the mold can be extended by smoothing the shape of the working mold, and the mechanical strength against the shearing force applied to the non-hollow portion of the engaging member is reduced without stress concentration. Advantageously, it can be secured.

According to the fifth aspect of the present invention, since the size of the recessed hole formed in the engagement member is larger at the opening end side than at the bottom side and is formed in a tapered shape, this recessed portion is formed. When the hole is formed by plastic working such as forging, it is possible to secure a large draft angle of the working mold and to advantageously secure mechanical strength against a shear force applied to the non-hollow portion of the engaging member. it can.

Further, according to the invention of claim 6, since a groove is formed on the inner peripheral surface of the recess formed in the engaging member in a substantially axial direction of the recess, the recess is formed. It is possible to increase the mechanical strength of the engagement member in the portion where the hole is formed.

In the invention according to claim 7, the engagement member of the rotation restricting means is provided in a substantially radial direction substantially perpendicular to the axial direction of the camshaft. Can be prevented from increasing in the axial direction of the camshaft.

Further, in the invention according to claim 8, the engagement member of the rotation restricting means is provided substantially in the axial direction substantially parallel to the axial direction of the camshaft. Can be prevented from increasing in the radial direction of the camshaft.

[0034]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view showing a cross section of a main part of a valve timing changing device for an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is an explanatory view including a cross-sectional view taken along line AOA of FIG. FIG. 3 is an enlarged view of a main part of FIG.

In FIG. 1, reference numeral 1 denotes a camshaft. The camshaft 1 is a camshaft for driving an intake valve or an exhaust valve of an internal combustion engine. In this embodiment, the camshaft is for driving an intake valve.

The camshaft 1 is rotatably supported by a bearing fixed to a cylinder head (not shown). A cam (not shown) is formed on the base (not shown) of the camshaft 1 on the right side in FIG. 2 of the bearing (not shown), and the cam drives the intake valve to open and close. .

Reference numeral 2 denotes a spider extending from the front cover (not shown) of the internal combustion engine. The spider 2 has axial passages 3 and 4 and circumferential grooves 5 located on the side close to the end face. 6 are formed respectively. Although the passage 3 is open at the end face, it is arbitrarily possible to close this open end with a plug member.

One end of the passages 3 and 4 communicates with the circumferential groove 5 via a radial passage 7. Also,
One end of the passage 4 communicates with the circumferential groove 6 via a radial passage 8.

Reference numeral 17 denotes a rotating body which is rotated in synchronization with the internal combustion engine. In this embodiment, the rotating body 17 is a sprocket which is rotationally driven by a crankshaft (not shown) of the internal combustion engine. The sprocket 17
Is rotatable together with the housing member 18 in this embodiment, and is rotatable relative to the camshaft 1 by a predetermined angle.

That is, the sprocket 17 is connected to a housing member 18 comprising an annular housing body 19 and plate members 20 and 21 disposed on both sides of the housing body 19 by connecting bolts (not shown). Have been. In addition, 22a and 22b are the sprocket 1
7. Positioning pins for positioning the housing body 19 and the plate members 20, 21.

The sprocket 17 is supported on the outer periphery of a bearing member 25 fixed to the camshaft 1 so that the sprocket 17 can rotate relative to the camshaft 1 by a predetermined angle.

On the outer peripheral side of the sprocket 17, external teeth 2
A timing chain 27 driven by a crankshaft (not shown) is wound around the external teeth 26.

The inside of the housing member 18 is hollow as a whole, and forms a plurality (four in this embodiment) of projections 28 projecting radially inward of the annular housing body 19. Thus, four chambers 29 connected at the central portion are formed radially outward (see FIG. 1).

Reference numeral 30 denotes a vane member housed in the housing member 18. The vane member 30 and the housing member 18 are used as main elements and the relative rotation means 3 described later in detail.
1 is configured.

A plurality of the vane members 30 project radially from the body 32 (four in this embodiment).
), And the vanes 33 are housed in the housing member 18 in a state where the vanes 33 are arranged in the room 29.

The vane 33 of the vane member 30 is
9, a pair of hydraulic oil chambers 34,
35 is defined. The pair of hydraulic oil chambers 34, 35
Are formed in this embodiment in four sets.

The fluid-tight sealing between the hydraulic oil chambers 34 and 35 is performed by a protrusion 28 formed on the inner peripheral side of the housing body 19.
A seal member 36 provided at the tip of the spring member (not shown)
To achieve sliding contact with the outer periphery of the body portion 32 of the vane member 30, and press the sealing member 38 provided at the tip of the vane 33 with the spring member 39 to slidingly contact the inner periphery of the housing body 22. It is like that.

The vane member 30 has a radial passage 40 communicating the circumferential groove 6 formed in the spider 2 with the hydraulic oil chamber 34, and the circumferential groove 5 and the hydraulic oil chamber 35 Are formed.

The circumferential grooves 6, 5 communicating with the radial passages 40, 41 respectively correspond to the passages 4, 3 formed in the spider 2.
The hydraulic oil chambers 34 and 35 respectively communicate with the passages 4 and 3 formed in the spider 2. For this reason, the hydraulic oil chamber 3
The housing member 18 and the vane member 30 can rotate relative to each other by selectively sucking and discharging the hydraulic oil into the housings 4 and 35.

Here, the sprocket 17 is connected to the housing member 18 and is rotatable relative to the camshaft 1.
Numeral 1 indicates that the sprocket 17 can rotate relative to the camshaft 1 within a predetermined angle range. Therefore, relative rotation means 31 for rotating the sprocket 17 relative to the camshaft 1 is constituted by using the vane member 30 and the housing member 18 as main elements.

Reference numeral 44 denotes a rotation restricting means provided between the housing member 18 and the vane member 30 for restricting the relative rotation between the housing member 18 and the vane member 30.
In this embodiment, the rotation restricting means 44 includes an engaging member 4 housed in a cylinder hole 45 formed radially in the vane member 30 together with a spring member 46 so as to be able to protrude and retract.
7 is engaged with an engagement hole 48 formed in the housing member 18.
It is configured to be able to engage with.

The cylinder hole 45 is provided in the vane member 30.
More specifically, the outer periphery of the trunk 32 of the vane member 30 and the vane 3
3 and is formed radially open to one of the hydraulic oil chambers 34 in a stepped portion 49 formed therebetween. In this embodiment, the cylinder hole 45 is formed by embedding a cylindrical cylinder hole member 50 made of a material having a hardness higher than that of the vane member 30 in the cylinder hole 45. Therefore, the cylinder hole 45 has a stepped shape in which the diameter of the portion in which the cylinder hole member 50 is embedded is reduced and the diameter of the bottom is increased. That is, the cylinder hole 4
5 has a stepped shape in which a small-diameter portion 45a is formed on the opening end side and a large-diameter portion 45b is formed on the bottom side (FIG. 3).
reference).

The inside of the cylinder hole 45 has a stepped hole-like passage 51 formed in the vane 33 at the bottom side.
It is open to the atmosphere through.

The engaging member 47 is made of a light alloy material such as titanium and has a substantially rod shape as a whole. Also, the small diameter portion 47 matching the stepped shape of the cylinder hole 45
a and a large-diameter portion 47b are formed in a stepped shape,
The distal end side is formed in a tapered shape, the large-diameter portion 47b is located on the enlarged bottom portion (large-diameter portion 45b) of the cylinder hole 45, and the small-diameter portion 47a is located on the inner surface of the cylinder hole member 50 (the small diameter of the cylinder hole). It is housed in the cylinder hole 45 while being supported by the portion 45a).

The engaging member 47 has recesses 52A and 52B at both ends in the axial direction, and a non-hollow portion 53 is formed between the recesses 52A and 52B. That is, a dent 52A is formed at the tip of the engaging member 47, and a dent 52B is formed in the end face of the large-diameter barrel 47b. Thus, the weight of the engaging member 47 is reduced. In addition, the depression 52
A, 52B between the inner peripheral surface and the bottom surface is formed in an arc shape,
They are connected smoothly.

The engaging member 47 is constantly urged in the radial direction by a spring member 46 disposed in the recessed hole 52B, and the tapered tip side can protrude from the cylinder hole 45. That is, the spring member 46 has one end in contact with the bottom of the cylinder hole 45 and the other end in contact with the bottom of the concave hole 52B formed in the engagement member 47, and constantly urges the engagement member 47 in the radial direction. I have. The spring member 46 employs a coil spring in this embodiment, but is not limited to this, and various spring members can be employed.

When the engaging member 47 is urged by the spring member 46 and its tip projects from the cylinder hole 45, the large-diameter portion 47b of the engaging member 47 becomes larger at the bottom side (larger diameter) of the cylinder hole 45. The stepped portion of the engagement member 47 abuts on the cylinder hole member 50 of the cylinder hole 45 by being located at the diameter portion 45b), thereby preventing the engagement member 47 from being pulled out of the cylinder hole 45. It is possible to

An annular chamber 47 is provided between the large diameter portion 47b of the engagement member 47 and the small diameter portion 45a of the cylinder hole 45.
A is formed. The annular chamber 47A
The outer diameter of the large diameter portion 47b of the engaging member 47 is set to a size having a considerable gap with respect to the inner diameter of the large diameter portion 45b of the cylinder hole 45. It communicates with the bottom side.

Since the engaging member 47 is accommodated in the cylinder hole 45 facing one of the working oil chambers 34, the tip of the engaging member 47 extends radially across one of the working chambers 34. It protrudes and engages with the engagement hole 48.

When the tip of the engaging member 47 is engaged with the engaging hole 48, the non-hollow portion 53 of the engaging member 47 is disposed in the cylinder hole 45 and the engaging hole 48. It has become. That is, the non-hollow portion 53 of the engagement member 47 is disposed corresponding to a gap (described later) 58 between a stepped portion 49 of the vane member 30 and a stepped portion (described later) 54 of the housing member 18. It has become.

The engaging hole 48 is provided in the housing member 18.
More specifically, a step 54 formed between the inner periphery of the housing body 19 and the projection 28 is formed so as to open toward one of the hydraulic oil chambers 34. The engagement hole 48
In this embodiment, is formed by embedding an engaging hole member 55 made of a harder material than the housing main body 19 and having an engaging hole 48 formed in the step portion 54 of the housing main body 19. It is.

The shape of the engaging hole 48 is such that the opening end side is formed in a cup shape having a large diameter, and the bottom of the engaging hole 48 is provided with an oil chamber 56 in a state where the engaging member 47 is engaged. Is formed. Further, an oil groove 57 formed on the inner surface of the engagement hole 48 and a gap 58 between the step 49 of the vane member 30 and the step 54 of the housing member 18 are formed in the engagement hole 48 and the oil chamber 56. Through the hydraulic oil chamber 34.

It is sufficient that the oil groove 57 is formed in a state in which the engaging member 47 is engaged.
By adjusting the depth at which the tapered tip of FIG. 7 enters the engagement hole 48, the inner surface of the engagement hole 48 and the engagement member 47 are adjusted.
Can be formed between the outer surface and the outer surface.

The stepped portion 5 having the engagement hole 48 is formed.
4, the housing member 18 in this embodiment
An inclined surface 59 which is inclined toward the hydraulic oil chamber 34 side is formed in the step portion 54 formed as shown in FIG.

66 is a hydraulic supply / discharge means. The hydraulic supply / discharge means 66 includes a supply / discharge passage 6 communicating with the passages 3 and 4, respectively.
A switching valve 73 for selectively switching the supply / discharge passages 67, 68 between a supply passage 70 from an oil pump 69 and a discharge passage 72 communicating with an oil storage tank 71, or for shutting off; A control device 74 for controlling the switching valve 73 is configured as a main element. The switching valve 73 employs a four-port valve in this embodiment, and various signals indicating the operating state of the internal combustion engine are input to a control device 74 that controls the switching valve 73.

In such a configuration, when the internal combustion engine is started, when the hydraulic oil is not sufficiently supplied from the oil pump 69, or when a signal for maintaining the most retarded state is input to the control device 74, The vane member 30 of the relative rotating means 31 is at the most retarded position with respect to the housing member 18 (see FIG. 1), and the engaging member 47 of the rotation restricting means 44 is urged by the spring force of the spring member 46, The tip of the engagement member 47 is engaged with the engagement hole 48, and the housing member 18
And the vane member 30 are linked. For this reason, a rotational driving force applied to the sprocket 17 as a rotating body from a crankshaft (not shown) via the timing chain 27 is transmitted to the camshaft 1 via the housing member 18 and the vane member 30. In this case, the step portion 49 of the vane member 30 can contact the side surface of the projection 28 forming the room 29 in the housing member 18, but preferably, the vane 33 does not contact the projection 28. .

When the camshaft 1 rotates, the intake valve of the internal combustion engine is driven, and the opening and closing of the intake valve is controlled.

When the vane member 30 is at the most retarded position with respect to the housing member 18, the rotation restricting means 4
The engagement member 47 of No. 4 is pressed by the centrifugal force and the spring force of the spring member 46, and its tip is engaged with the engagement hole 48, so that the relative rotation between the housing member 18 and the vane member 30 can be performed. Regulated. For this reason, the camshaft 1
When a positive or negative reversing torque acts on the camshaft 1 when driving an intake valve (not shown), the vane member 30 does not rotate relative to the housing member 18. Collision with the housing member 18 can be prevented, and generation of a tapping sound or the like is advantageously prevented.

At this time, the engaging member 47 receives a shearing force in the direction perpendicular to the axis by the housing member 18 and the vane member 30, but the non-hollow portion 53 of the engaging member 47
Are arranged in the cylinder hole 45 and the engagement hole 48, so that the same mechanical strength as when the entirety of the engagement member 47 is solid is ensured.

Next, when the advance angle is controlled, the switching valve 73 of the hydraulic supply / discharge means 66 is switched by the control device 74, and the supply passage 70 from the oil pump 69 is connected to the supply / discharge passage 68. At the same time, when the supply / discharge passage 67 is connected to the discharge passage 72, the operating oil from the oil pump 69 is supplied from the supply / discharge passage 68 via the passage 4, the radial passage 8, the circumferential groove 6, and the radial passage 40. It is guided into the hydraulic oil chamber 34.

The hydraulic oil guided into the hydraulic oil chamber 34 is:
Through the gap 58 and the oil groove 57, it is guided into the engagement hole 48 with which the tip of the engagement member 47 engages (and into the oil chamber 56 provided at the bottom of the engagement hole 4).

At the same time, the inside of the hydraulic oil chamber 35 communicates with the discharge passage 72 via the radial passage 41, the circumferential groove 5, the radial passage 7, the passage 3, and the supply / discharge passage 67.

The inside of the hydraulic oil chamber 34 and the rotation restricting means 44
The hydraulic oil is guided into the engagement hole 48 (oil chamber 56) of the, so that the hydraulic oil pressure of the hydraulic oil chamber 34 and the engagement hole 48 acts on the engagement member 47, and this engagement member 47 It is urged in a centrifugal direction against the force and pushed back into the cylinder hole 45. For this reason, the tip of the engaging member 47 is disengaged from the inside of the engaging hole 48 and the engagement is released, whereby the restraint of the housing member 18 and the vane member 30 by the engaging member 47 is released.

While the working oil is supplied into the working oil chamber 34, the inside of the working oil chamber 35 communicates with the discharge passage 72, so that the oil pressure in the working oil chamber 34 acts on the side surface of the vane 33, The vane member 30 is rotated with respect to the housing member 18 in the direction of the arrow in FIG. As a result, the sprocket 17 and the camshaft 1 rotate relatively, the rotational phase of the camshaft 1 is changed, the camshaft 1 is advanced, and the intake valve driven by the camshaft 1 is controlled. Opening / closing timing is advanced.

When the camshaft 1 is advanced and the vane member 30 is at the most advanced position with respect to the housing member 18, the engagement member 47 is moved into the cylinder hole 45 by the hydraulic pressure in the hydraulic oil chamber 34. , And the front end of the engaging member 47 does not contact the inner periphery of the housing 18.

Next, the switching valve 7 of the hydraulic supply / discharge means 66
3 is controlled by the control device 74 to switch the supply / discharge passage 6
7 is connected to a supply passage 70 from an oil pump 69 and a supply / discharge passage 68 is connected to a discharge passage 72.
The hydraulic oil from the oil pump 69 is guided to the hydraulic oil chamber 35. The hydraulic oil in the hydraulic oil chamber 34 is supplied to the suction / discharge passage 6.
8 and discharged through the discharge passage 72.

When the hydraulic oil in the hydraulic oil chamber 34 is discharged, the engaging member 47 protrudes in the radial direction by the centrifugal force acting on the engaging member 47. It does not contact the inner periphery of the housing member 18. When the engaging member 47 is located closer to the hydraulic oil chamber 34 than the step portion 54 of the housing body 19, the engaging member 48 does not engage with the engaging hole 48. Therefore, the housing member 18 and the vane member 30 The state in which the restraint by the rotation restricting means 44 is released is continued.

While the working oil is supplied into the working oil chamber 35, the inside of the working oil chamber 34 communicates with the discharge passage 72, so that the oil pressure in the working oil chamber 35 acts on the side surface of the vane 33, The vane member 30 is rotated counterclockwise in FIG. 1 with respect to the housing member 18, that is, in the retard direction.
Thereby, the sprocket 17 and the camshaft 1
Are relatively rotated, the rotation phase of the camshaft 1 is changed, the camshaft 1 is retarded, and the opening / closing timing of the intake valve driven by the camshaft 1 is delayed. become.

When the camshaft 1 is retarded and the vane member 30 is at the most retarded position with respect to the housing member 18, the engaging member 4 projecting into the hydraulic oil chamber 34.
The tip of 7 moves while being guided by the inclined surface 59 formed in the step portion 54 of the housing member 18, and is again engaged in the engagement hole 48.

When the vane member 30 is rotating with respect to the housing member 18 in the advance or retard direction, the switching valve 73 of the hydraulic supply / discharge means 66 is operated by the control device 7.
4, when the communication between the supply / discharge passages 67 and 68 and the supply passage 70 or the discharge passage 72 is interrupted,
The housing member 18 and the vane member 30 are held at an intermediate position of the relative rotation. As a result, the first sprocket 17 and the camshaft 1 are held at an intermediate position of the relative rotation, and the camshaft 1 moves the intake valve driven by the camshaft 1 at a desired timing. Will be in control.

In this case, since the inside of the hydraulic oil chamber 34 is maintained in a predetermined pressure state and is closed, a centrifugal force acts on the engaging member 47. Since the engaging member 47 does not protrude in the radial direction and does not engage with the engaging hole 48, the housing member 18 and the vane member 30
Is released.

Here, the engaging member 47 of the rotation restricting means 44 is provided with recessed holes 52A and 52B at both ends in the axial direction.
Since the non-hollow portion 53 is formed between the recessed holes 52A and 52B, the weight is reduced.

For this reason, the inertial mass of the engaging member 47 is reduced, and the operation responsiveness when the engaging member 47 performs the engaging operation and the disengaging operation is improved.

Therefore, there is provided the rotation restricting means 44 capable of promptly operating the engagement member 47 of the rotation restricting means 44 and rapidly restricting and canceling the change of the valve timing. An apparatus for changing a valve timing of an internal combustion engine is obtained.

The engaging member 4 of the rotation restricting means 44
Since the weight is reduced by providing the recessed holes 52A and 52B at both ends in the axial direction, the weight of the recessed hole 7 is smaller than that when the weight is reduced by forming the recessed hole on one side in the axial direction. The depth can be reduced. Therefore, the recesses 52A and 52B can be easily processed, and the weight of the engaging member 47 can be reduced.

The non-hollow portion 53 formed in the engaging member 47 is disposed in the cylinder hole 45 and the engaging hole 48 in a state where the tip of the engaging member 47 is engaged with the engaging hole 48. Therefore, the engaging member 47 is
In the case where shearing in the direction perpendicular to the axis is substantially performed by the vane member 8 and the vane member 30, the same mechanical strength as in the case where the entirety of the engaging member 47 is non-hollow can be secured.

Further, since the engaging member 47 is formed of a light alloy material, the weight of the engaging member 47 can be further reduced.

Further, the recesses 52A, 52B formed in the engaging member 47 are formed such that the recesses 52A, 52B are formed by plastic working such as forging because the inner peripheral surface and the bottom surface are smoothly connected. In addition, the working life of the working mold can be made longer by smoothing the shape of the working mold, and the mechanical strength against the shear force applied to the non-hollow portion 53 of the engaging member 47 can be advantageously reduced without stress concentration. Can be secured.

The engagement member 4 of the rotation restricting means 44
7 is provided substantially in the radial direction, which is substantially perpendicular to the axial direction of the camshaft 1, so that the rotation restricting means 44 can be prevented from being lengthened in the axial direction of the camshaft 1.

FIG. 4 is a view showing another embodiment of the present invention. This embodiment is different from the above-described embodiment in that the recesses 52A of the engaging member 47 of the rotation restricting means 44 are provided.
52B is a point that is tapered from the opening end toward the bottom.

That is, the recess 5 of the engagement member 47 shown in FIG.
2A and 52B are formed such that the opening ends at both ends in the axial direction are largely open, and the size at the opening end side is larger than that at the bottom side and is tapered. The inner peripheral surfaces and the bottom surfaces of the recessed holes 52A and 52B are formed in an arc shape and are smoothly connected.

The other components are the same as those of the above-described embodiment. Therefore, the same components are denoted by the same reference numerals, and redundant description will be omitted.

In this configuration, the same operation and effect as those of the above-described embodiment can be obtained, and in addition, the recessed holes 52A and 52B formed in the engaging member 47 are formed from the opening end toward the bottom side. Since it is formed in a tapered shape,
When forming A and 52B by plastic working such as forging, it is possible to secure a large draft angle of the working die and to advantageously reduce the mechanical strength against the shear force applied to the non-hollow portion 53 of the engaging member 47. Can be secured.

FIG. 5 is a view showing another embodiment of the present invention. This embodiment is different from the above-described embodiment in that a concave hole is formed on the inner peripheral surface of the concave hole 52B of the engaging member 47. The point is that a substantially axial groove 60 of 52B is formed.

That is, the recess 5 of the engaging member 47 shown in FIG.
A plurality of grooves 60 are formed in the inner peripheral surface of the hollow hole 52B having a large opening area in the axial direction of the hollow hole 52B. In addition, the depressions 52A, 52B
Are formed in an arc shape between the inner peripheral surface and the bottom surface, and are smoothly connected.

Since the other structure is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, and the description thereof will not be repeated.

According to this structure, the same operation and effect as those of the above embodiment can be obtained, and in addition, the engagement member 4
Since the substantially axial groove 60 of the hollow 52B is formed on the inner peripheral surface of the hollow 52B formed in No. 7, the mechanical strength of the engaging member 47 at the portion where the hollow 52B is formed is increased. Can be.

FIGS. 6 and 7 are views showing still another embodiment of the present invention. This embodiment is different from the above-described embodiment in that an engaging member 47 of the rotation restricting means 44 is provided.
Is provided substantially in the axial direction substantially parallel to the axial direction of the camshaft 1.

That is, the rotation restricting means 4 shown in FIGS.
Reference numeral 4 denotes a housing member 1 in which the tip of an engaging member 47 housed together with a spring member 46 so as to be able to protrude and retract into a cylinder hole 45 formed substantially in the axial direction of the camshaft 1 in the vane member 30.
8 is configured to be engageable with the engagement hole 48 formed.

The cylinder hole 45 is formed substantially in the axial direction in the body 32 of the vane member 30. The cylinder hole 45 is formed by embedding a cylindrical cylinder hole member 50 made of a harder material than the vane member 30 in the cylinder hole 45. The cylinder hole 45
Is open to the atmosphere on the bottom side thereof through a passage 51 formed obliquely in the vane 33.

The tip of the engaging member 47 is the engaging hole 4.
8, the non-hollow portion 53 of the engagement member 47 is arranged in the cylinder hole 45 and the engagement hole 48. That is, the non-hollow portion 53 of the engaging member 47 is arranged between the vane member 30 and the housing member 18.

The engagement hole 48 is provided in the housing member 18.
Specifically, it is formed on the plate member 21 of the housing member 18.

Since the other structure is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

In such a structure, the same operation and effect as described in the above embodiment can be obtained, and the engagement member 47 of the rotation restricting means 44 can be moved in the axial direction of the camshaft 1. Since they are provided substantially in parallel and substantially in the axial direction, it is possible to prevent the rotation restricting means 44 from becoming longer in the radial direction of the camshaft 1.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment, and can be changed without departing from the spirit of the invention.

[0107]

As described above in detail, according to the present invention, the engagement member of the rotation restricting means can be operated quickly, and the restriction and the release of the change of the valve timing can be quickly performed. A valve timing changing device for an internal combustion engine capable of performing the above is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross section of a main part of a valve timing device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is an explanatory view including a sectional view taken along the line AOA of FIG. 1;

FIG. 3 is an enlarged view showing a main part of FIG. 1;

FIG. 4 is a cross-sectional view of an engagement member according to another embodiment of the present invention.

FIG. 5 is a drawing showing a cross-sectional view (a) and a bottom view (b) of an engaging member according to another embodiment of the present invention.

FIG. 6 is a view similar to FIG. 2, but showing still another embodiment of the present invention.

FIG. 7 is an enlarged view showing a main part of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camshaft 17 Sprocket (rotating body) 18 Housing member 30 Vane member 31 Relative rotation means 44 Rotation restriction means 45 Cylinder hole 47 Engagement member 48 Engagement hole 52A, 52B Recessed hole 53 Non-hollow part

Claims (8)

[Claims] 1. A camshaft, which is provided between a rotating body that is rotated in synchronization with the rotation of an internal combustion engine and a camshaft that drives an intake valve or an exhaust valve, rotates the camshaft relative to the rotating body. In the valve timing changing device for an internal combustion engine, which is capable of changing the opening / closing timing of an intake valve or an exhaust valve, and comprising a rotation restricting means for restricting a relative rotation between the rotating body and the camshaft, And a vane member housed in the housing member and rotating with the other of the rotating body and the camshaft as a main element. And the rotation restricting means includes an engagement hole formed in one of the housing member and the vane member, and an engagement hole formed in the other of the housing member and the vane member. An engaging member that is provided so as to be able to protrude and retract in the formed cylinder hole, and whose tip can be engaged with the engaging hole;
Wherein the engagement member has a recess at each end in the axial direction, and a non-hollow portion is formed between the recesses. 2. The non-hollow portion formed in the engagement member of the rotation restricting means is disposed in the cylinder hole and the engagement hole when the tip of the engagement member is engaged with the engagement hole. The valve timing changing device for an internal combustion engine according to claim 1, wherein 3. The valve timing changing device for an internal combustion engine according to claim 1, wherein the engagement member of the rotation restricting means is formed of a light alloy material. 4. The valve timing of an internal combustion engine according to claim 1, wherein the inner peripheral surface and the bottom surface of the hollow formed in the engaging member of the rotation restricting means are smoothly connected. Change device. 5. The dent hole formed in the engaging member of the rotation restricting means, the opening end side dimension is larger than the bottom end side, and is formed in a tapered shape. Valve timing changing device for an internal combustion engine. 6. A groove is formed substantially in the axial direction of the inner peripheral surface of at least one of the recessed holes formed at both ends formed in the engagement member of the rotation restricting means. Do
The valve timing changing device for an internal combustion engine according to claim 1. 7. The valve timing of an internal combustion engine according to claim 1, wherein the engagement member of the rotation restricting means is provided in a substantially radial direction substantially perpendicular to an axial direction of the camshaft. Change device. 8. The valve timing of an internal combustion engine according to claim 1, wherein the engagement member of the rotation restricting means is provided in a substantially axial direction substantially parallel to an axial direction of the camshaft. Change device.