JP3679644B2 - Valve timing changing device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
This type of valve timing changing device is provided between a rotating body that is rotationally driven by a crankshaft of an internal combustion engine and a camshaft that drives an intake valve or an exhaust valve, and rotates the camshaft relative to the rotating body. The opening / closing timing of the intake valve or the exhaust valve is changed by moving.
[0003]
For example, Japanese Patent Laid-Open No. 10-103030 discloses a housing that rotates together with a rotating body that is rotated by a crankshaft of an internal combustion engine, a rotor that is housed in the housing and rotates together with a camshaft, and a radial direction in the rotor. A valve timing changing device provided with a plurality of vanes that are provided to project and form a plurality of hydraulic oil chambers in the housing, and that allows the hydraulic oil to be sucked into and discharged from the hydraulic oil chambers so that the housing and the rotor are relatively rotated. It is shown.
[0004]
Further, the valve timing changing device is provided with a rotation restricting means for restricting relative rotation between the housing and the rotor, and the rotation restricting means is provided in an engagement member (a knock pin) in a cylinder hole formed in the housing. ) Is slidable, and the engaging member is urged in the centripetal direction by the spring force of the spring member and inserted into the engaging hole provided in the rotor, so that the housing and the rotor are connected to each other to provide valve timing. On the other hand, the engagement member is pushed out of the engagement hole by the pressure of the hydraulic oil, thereby releasing the connection between the housing and the rotor and releasing the restriction on the valve timing.
[0005]
[Problems to be solved by the invention]
In the conventional example, the cylinder hole of the rotation restricting means is provided at the tip of the protrusion formed to protrude radially inward in the housing, and the engaging member accommodated in the cylinder hole is the spring member. The rotor body is urged in the centripetal direction by a spring force and is inserted into an engagement hole provided in the outer periphery of the rotor body. The outer periphery of the rotor body in which the engagement hole is formed is formed in an annular shape. In addition, the tip shape of the projection in which the cylinder hole is formed is a curved shape along the outer periphery shape of the body portion of the rotor. That is, the engagement hole is formed in a convex surface, the cylinder hole is formed in a concave surface, and the engagement hole and the cylinder hole are opened in a curved surface.
[0006]
Therefore, when the cylinder hole and the engagement hole are to be formed by embedding the respective hole members in the cylinder hole and the engagement hole, between the opening end of each hole and the end surface of the hole member. There is a possibility that a step is generated and the size of the step varies.
[0007]
When a step is generated between the opening end of the cylinder hole and the engagement hole and the end surface of each hole member, the contact position between the end of the cylinder hole member and the engagement member, and the end of the engagement hole member The contact positions with the engaging member are separated from each other in the axial direction of the engaging member. For this reason, when the engagement member is inserted into the engagement hole and restricts relative rotation between the housing and the rotor, the engagement member has a gap between the end of the cylinder hole member and the end of the engagement hole member. A moment whose length is the length of the arm will act, leading to a decrease in strength of the engaging member. In addition, if the step size varies, the strength of the engaging member varies.
[0008]
The present invention has been devised in view of the above conventional circumstances, and an open end of the bore, without causing a difference in level between the end surface of the hole member is embedded into the hole, a reduction in strength of the engaging member An object of the present invention is to provide a valve timing changing device for an internal combustion engine that can be advantageously avoided.
[0009]
[Means for Solving the Problems]
Accordingly, an invention according to claim 1 is provided between a rotating body that is rotated in synchronization with the rotation of the internal combustion engine and a camshaft that drives an intake valve or an exhaust valve, and the camshaft is provided 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 the intake valve or the exhaust valve by being relatively rotated, and provided with a rotation restricting means for restricting the relative rotation between the rotating body and the camshaft. A housing member that rotates together with either the rotating body or the camshaft, a vane member that is housed in the housing member and rotates together with either the rotating body or the camshaft, and a radial direction to the vane member And a vane that forms a plurality of hydraulic oil chambers in the circumferential direction in the housing member, and the rotation restricting means is either one of the housing member or the vane member. The faces on one of the hydraulic fluid chamber and an engaging hole which is formed so as to open a cylinder hole formed in the radial direction to the other of the housing members or vane member, retractable into the cylinder hole And an engagement member whose front end protrudes across the hydraulic oil chamber and can engage with the engagement hole, and both the cylinder hole and / or the engagement hole are together are formed by burying the hole member, the surface of the part was buried hole member component is made is formed in a substantially perpendicular plane to the axis of the bore, the engagement member, the engagement hole By combining, the relative rotation between the housing member and the vane member is restricted, and the relative rotation between both is permitted by releasing the engagement with the engagement hole.
[0010]
According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the engagement hole of the rotation restricting means is formed in the housing member, the cylinder hole is formed in the vane member in the radial direction, The engaging member is accommodated in the cylinder hole, and its tip protrudes in the radial direction so as to be engageable with the engaging hole.
[0011]
The invention of claim 3, wherein, in the constitution of the invention according to claim 1 or claim 2, wherein, by supplying the working oil to the hydraulic oil chamber before Kigakarigoana faces, the engaging member by the hydraulic fluid Is biased in the centripetal direction so as to release the engagement with the engagement hole.
[0012]
According to a fourth aspect of the present invention, in the configuration of the first aspect, the engagement hole member embedded in the engagement hole is harder than the housing member or the vane member in which the engagement hole is formed. The structure is made of a hard material.
[0013]
According to a fifth aspect of the present invention, in the configuration of the first aspect, the cylinder hole member embedded in the cylinder hole is harder than a housing member or a vane member in which the cylinder hole is formed. The structure is made of a material.
[0014]
According to a sixth aspect of the invention, in the configuration of the first aspect of the invention, the engaging member is attached with a spring member that urges the engaging member in the engaging direction with respect to the engaging hole. The configuration is
[0015]
In such a 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.
[0016]
In addition, relative rotation of the camshaft with respect to the rotating body causes the hydraulic oil to be sucked into and discharged from the hydraulic oil chamber in the housing member that rotates together with either the rotating body or the camshaft, so that the housing member and the vane member are relatively moved. This is done by turning. In this case, the intake and discharge of the hydraulic oil to and from the hydraulic oil chamber can be controlled by a hydraulic control device.
[0017]
By rotating the camshaft relative to the rotating body, the rotation phase of the camshaft with respect to the rotation of the internal combustion engine is changed, and the opening / closing timing of the intake valve or the exhaust valve is changed.
[0018]
Here, immediately after the start of the internal combustion engine, when the hydraulic oil is not supplied to the hydraulic oil chamber, the engaging member of the rotation restricting means protrudes in the engaging direction due to centrifugal force, spring force, etc., and its tip is engaged. Engage with the hole. For this reason, the rotary 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 restricted by the rotation restricting means, and the change of the valve timing is restricted.
[0019]
Next, by moving the engaging member of the rotation restricting means in the disengaging direction opposite to the engaging direction, the tip of the engaging member is detached from the engaging hole, and the engaging member and the engaging hole Is disengaged.
[0020]
According to the invention of claim 3, the disengagement of the rotation restricting means is performed as follows. That is, when the hydraulic oil is supplied to the hydraulic oil chamber where the engagement hole faces, the hydraulic oil is also supplied into the engagement hole. For this reason, the hydraulic pressure in the hydraulic oil chamber and the engagement hole acts on the engagement member, and the engagement member is urged in the centripetal direction against the centrifugal force and the spring force, and from the engagement hole. It will be pushed out. As a result, the tip of the engagement member is released from the engagement hole, and the engagement is released.
[0021]
As a result, the housing member and the vane member are released from the restraint by the engaging member, and the housing member and the vane member are rotated relative to each other by the hydraulic pressure supplied to the hydraulic oil chamber. By changing the rotational phase of the shaft, the opening / closing timing of the intake valve or exhaust valve driven by the camshaft is changed.
[0022]
Here, both or either of the cylinder bore and the engagement hole of the rotation restricting means may be formed by burying the hole member, the surface of the part worth of embedded the hole member, the axis of the hole center It is formed in a plane substantially perpendicular to.
[0023]
Thus, since the end surface of the opening end and the respective holes members of the holes may be arranged on the same plane, there is no difference in level occurs between the end surface of the opening end and the respective holes member hole. For this reason, the hole members can be brought as close as possible to each other, and the length of the arm of the moment acting on the engaging member can be shortened, so that a decrease in strength of the engaging member can be advantageously avoided.
[0024]
Therefore, the opening end of the hole, without causing a difference in level between the end surface of the hole member is embedded into the hole, the valve timing apparatus for an internal combustion engine capable of advantageously avoided reduced strength of the engaging member Is obtained.
[0025]
According to a second aspect of the present invention, the engaging hole of the rotation restricting means is formed in the housing member, the cylinder hole is formed in the vane member in the radial direction, and the engaging member is in the cylinder hole. Since the front end of the housing member and the vane member can be engaged with each other when the housing member and the vane member rotate, the distal end of the engaging member is moved to the engagement hole. Will act in the direction of engagement. For this reason, when a centrifugal force acts on the engaging member, the engaging member does not come out of the engaging hole, and there is no possibility that the restriction on the change of the valve timing is unintentionally released.
[0026]
According to a third aspect of the present invention, the engagement member is provided in a cylinder hole formed in the vane member so as to protrude radially, and a tip of the engagement member protrudes across the hydraulic oil chamber, Since the engagement hole provided in the member and through which the hydraulic oil in the hydraulic oil chamber is guided can be engaged, the hydraulic pressure of the hydraulic oil chamber can be directly applied to the engagement member, and the engagement member can be quickly moved. Operation becomes possible.
[0027]
In the invention according to claim 4, since the engagement hole member is formed of a material harder than the vane member or the housing member in which the engagement hole is formed, Wear can be suppressed and durability can be improved.
[0028]
In the invention according to claim 5, since the cylinder hole member is formed of a material harder than the vane member or the housing member in which the cylinder hole is formed, the wear of the cylinder hole is suppressed. Thus, durability can be improved.
[0029]
In the invention according to claim 6, since the engagement member is attached with a spring member for urging the engagement member in the engagement direction with respect to the engagement hole, the rotation of the internal combustion engine is prevented. The engaging member can be reliably engaged with the engaging hole even when the centrifugal force acting on the engaging member is extremely small or zero at extremely low speed or when stopped.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0031]
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 the line A-O-A of FIG.
[0032]
In the figure, reference numeral 1 denotes a camshaft for driving an intake valve or an exhaust valve of an internal combustion engine, and in this embodiment, a camshaft for driving an intake valve.
[0033]
The camshaft 1 is rotatably supported by a bearing fixed to a cylinder head (not shown). Further, a cam is formed on the trunk (not shown) of the right camshaft 1 in FIG. 2 with respect to the non-illustrated bearing, and the intake valve is driven to open and close by this cam. .
[0034]
Reference numeral 2 denotes a spider extending from the front cover (not shown) side of the internal combustion engine. At the end of the spider 2, axial passages 3 and 4 and circumferential grooves 5 and 6 positioned on the side close to the end face are respectively provided. It is formed. Although the passage 3 is open at the end face, it is optionally possible to close the open end with a plug member.
[0035]
Of the passages 3 and 4, one end of the passage 3 communicates with the circumferential groove 5 via the radial passage 7. Further, the one end side of the passage 4 communicates with the circumferential groove 6 through the radial passage 8.
[0036]
Reference numeral 17 denotes a rotating body that rotates in synchronization with the rotation of the internal combustion engine. In this embodiment, the rotating body 17 is a sprocket that is rotationally driven by a crankshaft (not shown) of the internal combustion engine. In this embodiment, the sprocket 17 can rotate together with the housing member 18 and can rotate relative to the camshaft 1 by a predetermined angle.
[0037]
That is, the sprocket 17 is connected to a housing member 18 comprising an annular housing main body 19 and plate members 20 and 21 disposed on opposite sides of the housing main body 19 by connecting bolts (not shown). . Reference numerals 22a and 22b denote positioning pins for positioning the sprocket 17, the housing body 19 and the plate members 20 and 21, respectively.
[0038]
Further, the sprocket 17 is supported on the outer periphery of a bearing member 25 fixed to the camshaft 1, and thereby can be rotated relative to the camshaft 1 by a predetermined angle.
[0039]
External teeth 26 are formed on the outer peripheral side of the sprocket 17, and a timing chain 27 driven by a crankshaft (not shown) is wound around the external teeth 26.
[0040]
The inside of the housing member 18 is hollow as a whole, and by forming a plurality (four in this embodiment) of protrusions 28 projecting radially inward of the annular housing body 19, Four chambers 29 connected at the central portion are formed on the outer side in the radial direction (see FIG. 1).
[0041]
Reference numeral 30 denotes a vane member accommodated in the housing member 18, and the relative rotation means 31, which will be described in detail later, is configured with the vane member 30 and the housing member 18 as main elements.
[0042]
The vane member 30 has a plurality (four in this embodiment) of vanes 33 projecting in the radial direction from the trunk portion 32, and the housing member in a state in which the vanes 33 are disposed in the chamber 29. 18.
[0043]
By arranging the vane 33 of the vane member 30 in the chamber 29, a pair of hydraulic oil chambers 34 and 35 are defined in the chamber 29 so as to face both sides of the vane 33 in the circumferential direction. The pair of hydraulic oil chambers 34 and 35 is formed in four sets in this embodiment.
[0044]
Sealing between the hydraulic oil chambers 34 and 35 is performed by pressing the seal member 36 provided at the tip of the projection 28 formed on the inner peripheral side of the housing body 19 with a spring member (not shown). This is accomplished by being brought into sliding contact with the outer periphery of the body portion 32 and pressing the seal member 38 provided at the tip of the vane 33 with the spring member 39 to be brought into sliding contact with the inner periphery of the housing body 19.
[0045]
The vane member 30 is formed with a radial passage 40 that communicates the circumferential groove 6 formed in the spider 2 and the hydraulic oil chamber 34, and also communicates the circumferential groove 5 and the hydraulic oil chamber 35. A radial passage 41 is formed.
[0046]
Since the circumferential grooves 6 and 5 communicating with the radial passages 40 and 41 respectively communicate with the passages 4 and 3 formed in the spider 2, the hydraulic oil chambers 34 and 35 are formed in the passage 4 formed in the spider 2. 3 to communicate with each other. For this reason, the housing member 18 and the vane member 30 can rotate relative to each other by selectively sucking and discharging the working oil into and from the working oil chambers 34 and 35 through the passages 4 and 3. .
[0047]
Here, the sprocket 17 is connected to the housing member 18 so as to be rotatable relative to the camshaft 1, whereby the relative rotating means 31 causes the sprocket 17 to move at a predetermined angle relative to the camshaft 1. Relative rotation is possible within the range. Accordingly, the relative rotation means 31 for rotating the sprocket 17 relative to the camshaft 1 is configured with the vane member 30 and the housing member 18 as main elements.
[0048]
Reference numeral 44 denotes a rotation restricting means which is provided between the housing member 18 and the vane member 30 and restricts relative rotation between the housing member 18 and the vane member 30. In this embodiment, the rotation restricting means 44 is accommodated in a cylinder hole 45 formed in the vane member 30 so that the tip of an engagement member 47 provided in the vane member 30 so as to protrude radially is provided. The engagement hole 48 formed in the housing member 18 can be engaged.
[0049]
The cylinder hole 45 opens to the vane member 30, more specifically, a stepped portion 49 formed between the outer periphery of the body portion 32 of the vane member 30 and the vane 33, facing one of the hydraulic oil chambers 34 and opening in the radial direction. Formed. In this embodiment, the cylinder hole 45 is formed by embedding a cylindrical cylinder hole member 50 made of a material harder than the vane member 30 in the cylinder hole 45. For this reason, 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 side is increased.
[0050]
The surface of the portion where the cylinder hole 45 is opened, that is, the surface of the stepped portion 49 is formed in a plane substantially perpendicular to the axis of the cylinder hole 45. Accordingly, the opening end of the cylinder hole 45 and the end face of the cylinder hole member 50 are arranged on the same plane, so that no step is generated between the opening end of the cylinder hole 45 and the end face of the cylinder hole member 50. is there.
[0051]
The inside of the cylinder hole 45 is open to the atmosphere via a stepped hole-shaped passage 51 formed in the vane 33 on the bottom side.
[0052]
The engagement member 47 is formed in a stepped shape, the tip end side is formed in a taper shape, the large-diameter barrel is located on the bottom side where the diameter of the cylinder hole 45 is increased, and the small-diameter barrel is a cylinder hole member. It is accommodated in the cylinder hole 45 in a state supported by the inner surface of the cylinder 50, and the tapered tip end side can protrude from the cylinder hole 45. When the front end of the engaging member 47 protrudes from the cylinder hole 45, the large diameter body portion of the engaging member 47 is positioned on the bottom side where the diameter of the cylinder hole 45 is increased, so that the step of the engaging member 47 is performed. The attached portion abuts on the cylinder hole member 50 of the cylinder hole 45 and can prevent the engaging member 47 from being pulled out of the cylinder hole 45.
[0053]
Since the engaging member 47 is accommodated in the cylinder hole 45 facing one of the hydraulic oil chambers 34, the distal end of the engaging member 47 protrudes in a radial direction across one of the working chambers 34. The joint hole 48 is engaged.
[0054]
The engaging member 47 has a recess 52 formed at the tip thereof, and a blind hole 53 that opens to the end surface on the large diameter body side. Thereby, the engaging member 47 is reduced in weight.
[0055]
The engagement hole 48 is formed in the housing member 18, specifically, in a step portion 54 formed between the inner periphery of the housing main body 19 and the projection 28 so as to open to face one of the hydraulic oil chambers 34. It is. In this embodiment, the engaging hole 48 is formed by embedding an engaging hole member 55 made of a material harder than the housing body 19 in the engaging hole 48.
[0056]
The surface of the portion where the engagement hole 48 opens, that is, the surface of the stepped portion 54 is formed in a plane substantially perpendicular to the axis of the engagement hole 48. Thereby, the opening end of the engagement hole 48 and the end surface of the engagement hole member 55 are arranged in the same plane, and a step is generated between the opening end of the engagement hole 48 and the end surface of the engagement hole member 55. There is no way.
[0057]
The shape of the engagement hole 48 is a cup shape having a large diameter on the opening end side, and an oil chamber 56 is formed at the bottom of the engagement hole 48 in a state where the engagement member 47 is engaged. Yes. The engagement hole 48 and the oil chamber 56 have an oil groove 57 formed on the inner surface of the engagement hole 48 and a planar shape between the step portion 49 of the vane member 30 and the step portion 54 of the housing member 18. The hydraulic fluid chamber 34 communicates with the gap 58. That is, since the surface of the stepped portion 49 where the cylinder hole 45 opens and the surface of the stepped portion 54 where the engagement hole 48 opens are formed in a flat shape, a flat gap 58 is formed between them. It will be.
[0058]
It is sufficient that the oil groove 57 is formed in a state where the engaging member 47 is engaged. Therefore, the depth at which the tapered tip of the engaging member 47 enters the engaging hole 48 is adjusted. Thus, it is possible to form between the inner surface of the engagement hole 48 and the outer surface of the engagement member 47.
[0059]
Further, an inclined surface 59 that is inclined toward the hydraulic oil chamber 34 is formed in the step portion 54 in which the engagement hole 48 is formed, that is, the step portion 54 formed in the housing member 18 in this embodiment. It is.
[0060]
66 is a hydraulic supply / discharge means. The hydraulic supply / discharge means 66 includes supply / discharge passages 67, 68 communicating with the passages 3, 4, and a discharge passage 72 communicating these supply / discharge passages 67, 68 with the supply passage 70 from the oil pump 69 and the oil storage tank 71. A switching valve 73 for selectively switching to and disconnecting from each other and a control device 74 for controlling the switching valve 73 are configured as main elements. The switching valve 73 is a four-port valve in this embodiment, and various signals indicating the operating state of the internal combustion engine are input to the control device 74 that controls the switching valve 73.
[0061]
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 relative rotation is performed. The vane member 30 of the means 31 is at the most retarded position with respect to the housing member 18 (see FIG. 1), and the distal end of the engaging member 47 of the rotation restricting means 44 engages with the engaging hole 48, and the housing member 18 and the vane member 30 are connected. Therefore, the rotational driving force applied to the sprocket 17 from the 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 stepped portion 49 of the vane member 30 can be in contact with the side surface of the projection 28 forming the chamber 29 in the housing member 18, but preferably the vane 33 is not in contact with the projection 28. .
[0062]
As the camshaft 1 rotates, the intake valve of the internal combustion engine is driven and open / close controlled.
[0063]
When the vane member 30 is at the most retarded position with respect to the housing member 18, the engagement member 47 of the rotation restricting means 44 is pressed by the centrifugal force, and the tip thereof engages with the engagement hole 48. The relative rotation between the housing member 18 and the vane member 30 is restricted. Therefore, when the camshaft 1 drives an intake valve (not shown), the vane member 30 rotates relative to the housing member 18 even if a positive or negative reversal torque acts on the camshaft 1. Therefore, the collision between the vane member 30 and the housing member 18 can be prevented, and it is advantageously prevented that the hitting sound is generated.
[0064]
Next, when the advance angle control is performed, the switching valve 73 of the hydraulic supply / exhaust means 66 is controlled to be switched by the control device 74, the supply passage 70 from the oil pump 69 is connected to the supply / discharge passage 68, By connecting the discharge passage 67 to the discharge passage 72, the hydraulic oil from the oil pump 69 is supplied from the supply / discharge passage 68 through the passage 4, the radial passage 8, the circumferential groove 6, and the radial passage 40. 34 is led. Further, the hydraulic oil introduced into the hydraulic oil chamber 34 is inserted into the engagement hole 48 (and the engagement hole 4 of the engagement hole 4) through which the front end of the engagement member 47 engages via the planar gap 58 and the oil groove 57. The oil is introduced into an oil chamber 56 provided at the bottom.
[0065]
At the same time, the inside of the hydraulic oil chamber 35 communicates with the discharge passage 72 through the radial passage 41, the circumferential groove 5, the radial passage 7, the passage 3, and the supply / discharge passage 67.
[0066]
When the hydraulic oil is introduced into the hydraulic oil chamber 34 and into the engagement hole 48 (oil chamber 56) of the rotation restricting means 44, the hydraulic oil in the hydraulic oil chamber 34 and the engagement hole 48 is supplied to the engagement member 47. Pressure is applied, and the engaging member 47 is urged in the centripetal direction against the centrifugal force and pushed back into the cylinder hole 45. For this reason, the front end of the engagement member 47 is released from the engagement hole 48 and the engagement is released, whereby the housing member 18 and the vane member 30 are released from the restraint by the engagement member 47.
[0067]
While the hydraulic oil is supplied into the hydraulic oil chamber 34, the hydraulic oil chamber 35 communicates with the discharge passage 72, whereby the hydraulic pressure in the hydraulic oil chamber 34 acts on the side surface of the vane 33, and the vane member 30. Is rotated in the direction of the arrow in FIG. As a result, the sprocket 17 and the camshaft 1 rotate relative to each other, the rotational phase of the camshaft 1 with respect to the crankshaft is changed, and the camshaft 1 is controlled to advance and driven by the camshaft 1. The opening and closing timing of the intake valve is advanced.
[0068]
When the camshaft 1 is controlled to advance, and the vane member 30 is at the most advanced position with respect to the housing member 18, the engaging member 47 is pushed back into the cylinder hole 45 by the hydraulic pressure in the hydraulic oil chamber 34. This state continues, and the tip of the engaging member 47 does not contact the inner periphery of the housing 18.
[0069]
Next, the switching valve 73 of the hydraulic supply / discharge means 66 is controlled to be switched by the control device 74, the supply passage 70 from the oil pump 69 is connected to the supply / discharge passage 67, and the supply / discharge passage 68 is connected to the discharge passage 72. Then, 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 discharged to the oil storage tank 71 through the intake / exhaust passage 68 and the discharge passage 72.
[0070]
As 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, but the tip of the engaging member 47 is at the end of the housing 18. There is no contact with the inner circumference. Further, when the engaging member 47 is closer to the hydraulic oil chamber 34 than the stepped portion 54 of the housing main body 19, the engaging member 47 does not engage with the engaging hole 48. The state where the restriction by the rotation restricting means 44 is released is continued.
[0071]
While the hydraulic oil is supplied into the hydraulic oil chamber 35 and the hydraulic oil chamber 34 communicates with the discharge passage 72, the hydraulic pressure in the hydraulic oil chamber 35 acts on the side surface of the vane 33, and the vane member 30. Is rotated counterclockwise, that is, retarded in FIG. As a result, the sprocket 17 and the camshaft 1 rotate relative to each other, the rotational phase of the camshaft 1 relative to the crankshaft is changed, and the camshaft 1 is retarded and driven by the camshaft 1. The timing of opening and closing the intake valve is delayed.
[0072]
When the camshaft 1 is controlled to be retarded and the vane member 30 is at the most retarded position with respect to the housing member 18, the front end of the engaging member 47 protruding into the hydraulic oil chamber 34 is the step of the housing 18. It moves while being guided by the inclined surface 59 formed in the portion 54, and is engaged again in the engagement hole 48.
[0073]
Further, the switching valve 73 of the hydraulic supply / discharge means 66 is controlled to be switched by the control device 74 in a state where the vane member 30 is rotated in the advance direction or the retard direction with respect to the housing member 18, so that the supply / discharge passage is provided. When the communication between the supply passages 67 and 68 and the supply passage 70 or the discharge passage 72 is blocked, the housing member 18 and the vane member 30 are held at an intermediate position of relative rotation. As a result, the first sprocket 17 and the camshaft 1 are held at an intermediate position of relative rotation, and the camshaft 1 moves the intake valve driven by the camshaft 1 at a desired timing. To control.
[0074]
In this case, the inside of the hydraulic oil chamber 34 is maintained in a predetermined pressure state and is in a sealed state, so that centrifugal force acts on the engagement member 47. Since the member 47 does not protrude in the radial direction and does not engage with the engagement hole 48, the housing member 18 and the vane member 30 continue to be released from the restraint by the rotation restricting means 44. The
[0075]
The cylinder hole 45 and the engagement hole 48 of the rotation restricting means 44 are formed by embedding the cylinder hole member 50 and the engagement hole member 55 in the cylinder hole 45 and the engagement hole 48, respectively. Further, the surface of the portion where the cylinder hole 45 in which the cylinder hole member 50 is embedded and the engagement hole 48 in which the engagement hole member 55 is embedded, that is, the surface of the stepped portion 49 and the stepped portion 54 are respectively formed in the cylinder hole 45. It is formed in a plane substantially perpendicular to the axis and the axis of the engagement hole 48.
[0076]
Accordingly, the opening ends of the cylinder hole 45 and the engagement hole 48 and the end surfaces of the respective hole members 50 and 55 can be arranged on the same plane. There is no step between the end surfaces of the members 50 and 55. Therefore, the cylinder hole member 50 and the engagement hole member 55 can be made as close as possible to each other, and the length of the arm of the moment acting on the engagement member 47 is shortened. A reduction in strength can be advantageously avoided.
[0077]
Accordingly, there is no step between the opening ends of the cylinder hole 45 and the engagement hole 48 and the end surfaces of the hole members 50 and 55 embedded in these holes, and the strength of the engagement member 47 is advantageously reduced. A valve timing changing device for an internal combustion engine that can be avoided is obtained.
[0078]
An engagement hole 48 of the rotation restricting means 44 is formed in the housing member 18, a cylinder hole 45 is formed in the vane member 30 in the radial direction, and an engagement member 47 is disposed in the cylinder hole 45 of the vane member 30. And the distal end of the housing member 18 and the vane member 30 rotate when the housing member 18 and the vane member 30 rotate, so that the centrifugal force acting on the engaging member 47 is engaged with the engaging member 47. This acts in a direction to engage the tip of the engagement hole 48 with the engagement hole 48. For this reason, when a centrifugal force acts on the engaging member 47, the engaging member 47 does not come out of the engaging hole 48, and there is no possibility that the restriction on the change of the valve timing is unintentionally released.
[0079]
Further, the engaging member 47 is provided in a cylinder hole 45 formed in the vane member 30 so as to be able to protrude in the radial direction, and its tip protrudes across the hydraulic oil chamber 34 and is provided in the housing member 18 to operate. Since the oil can be engaged with the engagement hole 48 through which the oil is guided, the hydraulic pressure of the hydraulic oil chamber 34 can be directly applied to the engagement member 47, and the engagement member 47 can be quickly operated. .
[0080]
Further, since the engagement hole member 55 is formed of a material whose hardness is harder than that of the housing member 18, wear of the engagement hole 48 can be suppressed and durability can be improved.
[0081]
In addition, since the cylinder hole member 50 is formed of a material that is harder than the vane member 30, wear of the cylinder hole 45 can be suppressed and durability can be improved.
[0082]
Further, since the stepped portion 54 in which the engagement hole 48 is formed has an inclined surface 59 inclined toward the hydraulic oil chamber 34 side, the inclined surface 59 guides the tip of the engagement member 47. Thus, the tip of the engagement member 47 is easily engaged with the engagement hole 48.
[0083]
FIG. 3 is a drawing showing another embodiment of the present invention. This embodiment is different from the above embodiment in that the engagement member 47 is disposed on the engagement member 47 of the rotation restricting means 44 in the radial direction. This is the point that the spring member 46 for biasing is attached.
[0084]
That is, the rotation restricting means 44 according to the embodiment shown in FIG. 3 is accommodated in a cylinder hole 45 formed in the vane member 30, so that the engaging member 47 is provided on the vane member 30 so as to protrude radially. The spring member 46 is configured to be engageable with an engagement hole 48 formed in the housing member 18 and urge the engagement member 47 in the radial direction together with the engagement member 47 in the cylinder hole 45. It is set as the structure which accommodated.
[0085]
The spring member 46 is in contact with the bottom portion of the cylinder hole 45 and the other end is in contact with the bottom portion of the blind hole 53 formed in the engagement member 47 so as to constantly urge the engagement member 47 in the radial direction. In addition, although the coil spring is employ | adopted in this embodiment as the said spring member 46, not only this but various spring members are employable.
[0086]
Since other configurations are the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description thereof is omitted.
[0087]
In such a configuration, the engaging member 47 of the rotation restricting means 44 is always urged in the radial direction by the spring force of the spring member 46. In other words, the spring force of the spring member 46 acts on the engagement member 47 in addition to the centrifugal force.
[0088]
Therefore, in such a configuration, in addition to the same operation and effect as the above-described embodiment, the engagement member 47 is attached with a spring member 46 that urges the engagement member 47 in the radial direction. Therefore, even when the rotation of the internal combustion engine is at an extremely low speed or when the engine is stopped and the centrifugal force acting on the engagement member 47 is extremely small or zero, the engagement member 47 is inserted into the engagement hole 48. Can be reliably engaged.
[0089]
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 gist of the invention. For example, the rotation restricting means 44 is engaged with the engaging hole 48 formed in the stepped portion 54 of the housing 18 and the tip of the engaging member 47 provided in the stepped portion 49 of the vane member 30 so as to be able to protrude and retract in the radial direction. Although the possible configuration has been described, an engagement hole 48 may be formed in the step portion 49 of the vane member 30 and an engagement member 47 may be provided in the step portion 54 of the housing member 18.
[0090]
Moreover, although the embodiment for controlling the advance angle of the camshaft 1 has been described, it can also be adopted in a valve timing changing device for controlling the retard angle.
[0091]
【The invention's effect】
As described above in detail, according to the present invention, the open end of the bore, without causing a difference in level between the end surface of the hole member is embedded in the hole, preferably the strength reduction of the engaging member A valve timing changing device for an internal combustion engine that can be avoided is obtained.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing a cross section of a main part of a valve timing device for an internal combustion engine showing an embodiment of the present invention.
2 is an explanatory view including a cross-sectional view taken along the line A-O-A in FIG. 1;
FIG. 3 is a view similar to FIG. 1 showing another embodiment of the present invention.
[Explanation of symbols]
1 Camshaft 17 Sprocket (Rotating body)
18 Housing member 30 Vane member 31 Relative rotation means 33 Vane 44 Rotation restriction means 45 Cylinder hole 47 Engagement member 48 Engagement hole 50 Cylinder hole member 55 Engagement hole member

Claims (6)

An intake valve or an exhaust valve is provided between a rotating body that rotates in synchronization with the rotation of the internal combustion engine and a camshaft that drives an intake valve or an exhaust valve, and the camshaft is rotated relative to the rotating body. In the valve timing changing device for an internal combustion engine provided with a rotation restricting means for restricting relative rotation between the rotating body and the camshaft, the opening / closing timing of the engine can be changed.
A housing member that rotates together with either the rotating body or the camshaft;
A vane member housed in the housing member and rotated together with either the rotating body or the camshaft;
The vane member includes a vane that protrudes in the radial direction and forms a plurality of hydraulic oil chambers in the circumferential direction in the housing member,
The rotation restricting means is
An engagement hole formed on one of the housing member and the vane member so as to face one of the hydraulic oil chambers ;
A cylinder bore formed radially in either the housing member or the vane member;
An engagement member which is provided so as to be able to appear and retract in the cylinder hole and whose tip protrudes across the hydraulic oil chamber and can be engaged with the engagement hole;
Formed from
Further, the cylinder bore and both or one of the engaging hole, as well are formed by burying the hole member, the surface of the part was buried hole member component is substantially perpendicular plane to the axis of the bore The engaging member regulates the relative rotation of the housing member and the vane member by engaging with the engaging hole and releases the engagement with the engaging hole. An apparatus for changing a valve timing of an internal combustion engine, characterized by allowing rotation.   The engaging hole of the rotation restricting means is formed in the housing member, the cylinder hole is formed in the vane member in the radial direction, and the engaging member is accommodated in the cylinder hole, and the tip of the engaging member protrudes in the radial direction for engagement. 2. The valve timing changing device for an internal combustion engine according to claim 1, wherein the valve timing changing device is engageable with the hole. By supplying hydraulic fluid to the hydraulic oil chamber facing the front Kigakarigoana, and cancels the engagement with the engaging hole to bias the engaging member in the centripetal direction by the hydraulic oil The valve timing changing device for an internal combustion engine according to claim 1 or 2 .   The engagement hole member embedded in the engagement hole is formed of a material that is harder than a housing member or a vane member in which the engagement hole is formed. A valve timing changing device for an internal combustion engine.   2. The internal combustion engine according to claim 1, wherein the cylinder hole member embedded in the cylinder hole is formed of a material that is harder than a housing member or a vane member in which the cylinder hole is formed. Valve timing change device.   2. The valve timing changing device for an internal combustion engine according to claim 1, wherein a spring member for urging the engaging member in an engaging direction with respect to the engaging hole is attached to the engaging member.

Images