JP5194993B2 - Driver device integrated actuator - Google Patents

Description

  The present invention relates to a driver device integrated actuator in which, for example, an electromagnetically driven actuator is integrally assembled with a driver device for driving the actuator based on a drive command from a control device.

  For example, as described in Patent Document 1, a valve timing variable mechanism that varies the timing at which the engine valve opens to the advance side or the retard side, and a valve lift amount variable mechanism that varies the lift amount of the engine valve; There is known a variable valve mechanism for an in-vehicle internal combustion engine that can flexibly change engine valve characteristics. An outline of such a variable valve mechanism described in Patent Document 1 is shown in FIG.

  As shown in FIG. 7, the variable valve mechanism is a first mechanism having a variable valve timing mechanism 22 for an intake valve provided at one end of an intake camshaft 21 and an end of an exhaust camshaft 23. An exhaust valve variable valve timing mechanism 24 is provided. The valve timing variable mechanisms 22 and 24 are both known mechanisms that vary the rotational phase between the intake camshaft 21 or the exhaust camshaft 23 and the crankshaft CS that is the engine output shaft. Based on the operation of these mechanisms. The opening / closing timing of an engine valve such as an intake valve or an exhaust valve is variable.

  The variable valve mechanism includes a control shaft 25 provided in parallel to the intake camshaft 21, a rocker arm (not shown) that pushes down the intake valve, and an intake cam 21 a of the intake camshaft 21 as a second mechanism. Is provided with a variable valve lift amount mechanism that makes the lift amount of the intake valve variable by the cooperation of the mediation drive mechanism 26 that mediates the above. This variable valve lift amount mechanism is a rocker arm in which the operating angle of the mediating drive mechanism 26 is variable based on the movement of the control shaft 25 in the axial direction through an actuator 27 provided at the base end of the control shaft 25. This is also a well-known mechanism in which the valve depression amount due to the valve, that is, the lift amount of the intake valve is variable.

Here, the actuator 27 has a planetary differential screw type rotation-linear motion conversion mechanism and an electric motor lubricated by the lubricating oil, and the electric motor is driven through the driver device 29 based on a drive command from the control device 28. By being rotationally driven, the above-described movement of the control shaft 25 in the axial direction is performed by the rotation-linear motion conversion mechanism. The driver device 29 is also a well-known device in which circuit elements such as power transistors are mounted on a printed wiring board or the like. In recent years, as shown in FIG. 8, a driver device integrated actuator in which the actuator 27 and a driver device 29 for driving the actuator 27 are integrally assembled has been adopted as such a variable valve lift amount mechanism.
JP 2007-205237 A

Thus, by integrating the driver device 29 with the actuator 27, maintenance, inspection, repair and the like are facilitated, and the casing of the driver device 29 also serves as a housing for sealing the lubricating oil in the actuator 27. In addition, the number of parts can be reduced. However, when such a driver device integrated actuator is used for the valve lift variable mechanism, the mechanical vibration applied to the driver device 29 via the control shaft 25 or the actuator 27 cannot be ignored. That is, since the driver device 29 itself is a precision electronic device that is sensitive to vibrations applied in this way, when it is integrated with the actuator 27, the mechanical and electrical tolerance management of its internal components is tightened. At present, its reliability is ensured.

  In addition to the above variable valve lift amount mechanism, in the case of a driver device integrated actuator in which an actuator that accompanies vibration or is easily transmitted is driven and a driver device that drives this is integrated. The issues are generally common.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a driver device integrated actuator that can suitably reduce vibration transmitted to the driver device due to mechanical connection with the actuator. Is to provide.

(1) The first means is the invention according to claim 1, that is, an electrically driven actuator, a driver device for driving the actuator, an opening of the housing of the actuator, and one surface of the casing of the driver device. In the driver device integrated actuator having an O-ring disposed between the openings, the opening of the housing has a groove in which the O-ring is disposed, and the O-ring includes a ring-shaped sealing portion; It has a plurality of vibration control parts and a plurality of connecting parts, and the sealing part has a shape for sealing the opening of the housing, and the plurality of connecting parts are outer peripheral surfaces of the sealing part. Projecting outward, connecting the sealing portion and each of the plurality of vibration damping portions to each other, the groove having a first groove portion in which the sealing portion is disposed, and the vibration damping portion being disposed. The second groove and the connection And the sealing portion corresponding to the depth direction of the first groove portion in a state where the sealing portion is not compressed by the opening of the housing and one surface of the casing. The height of the sealing part is larger than the depth of the first groove part, and the vibration damping part is compressed by the opening of the housing and one surface of the casing. When the dimension of the damping part corresponding to the depth direction of the second groove part is the height of the damping part in a state where it is not, the height of the damping part is larger than the depth of the second groove part. And the compression rate of the sealing part in a state where the sealing part is compressed by the opening of the housing and one surface of the casing is larger than the height of the sealing part, and the vibration damping Part is the housing When the compression rate of the vibration damping part in a state compressed by the opening and one surface of the casing is a second compression rate, the second compression rate is greater than the first compression rate, and the first compression rate Indicates “(height of the sealing portion−depth of the first groove portion) / height of the sealing portion”, and the second compression ratio is “(height of the damping portion−the height of the damping portion). The gist of the present invention is that the actuator is a driver device-integrated actuator indicating "depth of the second groove portion) / height of the damping portion".
(2) The second means is the invention according to claim 2, that is, the depth of the first groove is defined by taking a cross section of the O ring parallel to the radial direction of the O ring and the depth direction of the groove as a reference cross section. Is a dimension from the opening of the first groove to the bottom of the first groove in the reference cross section, and the depth of the second groove is the first from the opening of the second groove in the reference cross section. 2 shows the dimension to the bottom surface of the groove portion, and the height of the sealing portion is that of the sealing portion in a state where the sealing portion is not compressed by the opening of the housing and one surface of the casing in the reference cross section. The height of the vibration damping part indicates a dimension of the vibration damping part in a state in which the vibration damping part is not compressed by the opening of the housing and one surface of the casing in the reference cross section. Dry as described in And summarized in that device which is an integrated actuator.
(3) The third means is the invention according to claim 3, that is, the depth of the third groove portion indicates the dimension from the opening portion of the third groove portion to the bottom surface of the third groove portion in the reference cross section. The gist of the present invention is the driver device integrated actuator according to claim 2, which is smaller than the depth of the first groove and the depth of the second groove.
(4) The fourth means corresponds to the invention according to claim 4, that is, the connecting portion is not compressed by the opening of the housing and one surface of the casing and corresponds to the depth direction of the third groove portion. The height of the said connection part is smaller than the height of the said sealing part, and the height of the said damping part when the dimension of the said connection part is made into the height of the said connection part. The gist of the present invention is the driver device-integrated actuator described in (1).
(5) The fifth means corresponds to the invention according to claim 5, that is, corresponds to the width direction of the first groove portion when the sealing portion is not compressed by the opening of the housing and one surface of the casing. The driver device according to any one of claims 1 to 4, wherein a width of the sealing portion is smaller than a width of the first groove portion when a dimension of the sealing portion to be performed is a width of the sealing portion. The gist is that it is an integrated actuator.
(6) The sixth means corresponds to the invention according to claim 6, that is, corresponds to the width direction of the second groove portion when the damping portion is not compressed by the opening of the housing and one surface of the casing. The driver device according to any one of claims 1 to 5, wherein a width of the damping unit is smaller than a width of the second groove when a dimension of the damping unit to be performed is a width of the damping unit. The gist is that it is an integrated actuator.
(7) The seventh means is the driver device integrated actuator according to claim 5 or 6, wherein the width of the sealing portion is equal to the width of the vibration damping portion. Is the gist.
(8) The eighth means is the driver device according to any one of claims 1 to 7, wherein the width of the second groove portion is greater than the width of the first groove portion. The gist is that it is an integrated actuator.
(9) The ninth means is the invention according to claim 9, that is, the width of the first groove is the dimension of the first groove in the direction perpendicular to the depth direction of the first groove in the reference cross section. Show
The width of the second groove portion indicates the dimension of the second groove portion in a direction orthogonal to the depth direction of the second groove portion in the reference cross section, and the width of the sealing portion is the sealing portion in the reference cross section. Shows the dimensions of the sealing portion in a state where it is not compressed by the opening of the housing and one surface of the casing, and the width of the damping portion is such that the damping portion and the opening of the housing in the reference cross section It is a gist that it is a driver device integrated actuator according to any one of claims 5 to 8, which quotes at least claim 2 showing a dimension of the damping part in a state where it is not compressed by one surface of the casing. To do .
(10) The tenth means is the invention according to claim 10 , that is, the driver device integrated actuator has a plurality of bolts for fixing the housing and the casing to each other, and the opening of the housing has The driver device according to claim 1 , further comprising a plurality of insertion portions for inserting each of the plurality of bolts, wherein the plurality of insertion portions are formed outside the groove. The gist is that it is an integrated actuator.
(11) The eleventh means is the invention according to claim 11 , that is, the plurality of insertion portions each of the plurality of insertion portions is the plurality of the plurality of insertion portions with a plane along the end surface of the opening of the housing as a reference plane. is a formed at a position having a one-to-one relationship with each of the vibration damping unit, the virtual line segment connecting the insertion portion and the damping unit correspond to each other, claim passing through the center axis of the sealing portion 10 The gist of the present invention is the driver device-integrated actuator described in (1).
(12) The twelfth means is the invention according to claim 12 , that is, the actuator includes an electric motor and a rotation / linear motion conversion mechanism, and the rotation / linear motion conversion mechanism linearly rotates the electric motor. The gist of the present invention is the driver device integrated actuator according to any one of claims 1 to 11 , wherein the actuator is converted into motion and the control shaft of the variable valve lift mechanism of the internal combustion engine is driven by the linear motion after the conversion. .

  Since the damping part provided in the O-ring is thicker than the ring-shaped sealing part as in the above-described configuration, the O-ring is provided between the actuator housing and the driver device casing. When the ring is interposed, the compression reaction force generated in the vibration damping portion is larger than the compression reaction force generated in the sealing portion. For this reason, even if vibration is applied from the actuator side to the driver device due to the operation of the actuator and a mechanism provided with the actuator, the applied vibration is absorbed, mitigated, or suppressed by the damping unit. become. In addition, since the vibration damping portion is provided in such a manner that it is connected to the O-ring via a portion protruding outward from the ring outer peripheral surface of the sealing portion, the housing of the actuator by the sealing portion Independently of the sealing function for the opening, it is possible to set the damping function as the damping unit, that is, the shape, dimensions, and the like, and it is easy to realize including the design.

  According to the said structure, the influence which the part which connects the sealing part and damping part which function independently each has on the sealing function by these sealing parts and the damping function by a damping part can be disregarded. In particular, the entire sealing portion is compressed uniformly, and the sealing function of the sealing portion with respect to the housing opening of the actuator is reliably maintained.

  FIG. 1 to FIG. 6 show an embodiment in which a driver device integrated actuator according to the present invention is applied to an actuator and a driver device employed in the valve lift variable mechanism illustrated in FIGS. The description will be given with reference.

  First, the outline | summary of the driver apparatus integrated actuator of this embodiment is demonstrated with reference to FIGS. 1 to 3, the actuator 11 corresponds to the actuator 27 illustrated in FIGS. 7 and 8, and the driver device 12 corresponds to the driver device 29 similarly illustrated in FIGS. 7 and 8.

  As shown in FIG. 1, the driver device integrated actuator includes a driver device 12 including a connector 13 to which a wire harness used for electrical connection between the actuator 11 and a control device (not shown) is attached and detached. Are integrally fastened by bolts (15b, 15c, etc.). Between the actuator 11 and the driver device 12, an O includes a sealing portion 14a that seals the opening of the actuator 11 and a vibration damping portion 14b that is thicker than the sealing portion 14a. An (O) ring 14 is interposed.

Here, FIG. 2 shows a front structure of the actuator integrated with the driver device as viewed from the driver device 12 side, and FIG. 3 shows a cross section taken along the line AA of FIG. The front structure is shown about the housing opening part of the actuator 11 seen from the coupling | bond part with the apparatus 12. FIG. Among these, the housing opening of the actuator 11 shown in FIG. 3 is provided with a groove for mounting the O-ring 14 together with four bolt grooves (internal threads) 16a, 16b, 16c and 16d. An O-ring 14 is fitted. On the other hand, in the driver device 12 shown in FIG. 2, four bolt holes are formed on one surface of the casing so as to correspond to the four bolt grooves (female screws) 16a, 16b, 16c, and 16d, respectively. Bolts 15a, 15b, 15c and 15d are screwed into corresponding bolt grooves (internal threads) 16a, 16b, 16c and 16d through bolt holes. As shown in FIG. 3, the actuator 11 includes an electric motor 17 that rotates based on a drive signal input from the driver device 12 through an appropriate wiring (not shown), and the electric motor 17. A rotation-linear motion conversion mechanism 18 that converts the rotational motion into a linear motion is provided.

  Next, regarding the O-ring 14 having the sealing portion 14a and the vibration damping portion 14b and interposed between the housing opening of the actuator 11 and one surface of the casing of the driver device 12, the structure and operation thereof are as follows. This will be described with reference to FIGS.

  As shown in FIG. 3, the O-ring 14 is provided in the housing opening of the actuator 11 along the outer periphery of the electric motor 17. The O-ring 14 includes a ring-shaped sealing portion 14a and four connecting portions protruding outward from the sealing portion 14a, that is, on the side opposite to the electric motor 17 and the rotation-linear motion conversion mechanism 18. 14c and a vibration damping portion 14b having a columnar shape connected to the tips of the connecting portions 14c. Of these, the connecting portion 14c and the damping portion 14b are respectively bolt bolts (internal threads) 16a, 16b, 16c, and 16d that are fastening portions to one surface of the casing of the driver device 12, and the outer periphery of the sealing portion 14a. The protrusion (extension) aspect from the sealing part 14a is set so that it may be located on the straight line from which the distance with a surface becomes the shortest. FIG. 4 shows an enlarged plan view of such an O-ring 14.

On the other hand, FIG. 5 shows a cross-sectional structure of the O-ring 14 along the line BB in FIG. 4 and a cross-sectional structure of a groove formed in the housing opening of the actuator 11 as a groove for mounting the O-ring 14. Is. As shown in FIG. 5, the sealing portion 14a of the O-ring 14 has a circular cross section, and the vibration damping portion 14b has a rectangular cross section. Further, as apparent from FIG. 5, the thicknesses of the sealing portion 14a, the vibration damping portion 14b, and the connecting portion 14c constituting the O-ring 14 are as follows.
Connecting part 14c <sealing part 14a <damping part 14b
It is set to such a relationship. Corresponding to such a shape of the O-ring 14, the cross-sectional shape of the groove is W1 for the wire diameter of the sealing portion 14a, and W2 and H for the width and height of the vibration damping portion 14b made of a cylinder, respectively. When the width and depth of the rectangular groove into which the sealing portion 14a is fitted are G1 and h1, respectively, and the width and depth of the rectangular groove into which the damping portion 14b is fitted are G2 and h2, respectively, these dimensions are as follows:
H> W1
W2 = W1
G1> W1
h1 <W1
G2> G1
h2> h1
h2 <H
It is set to satisfy the relationship.

Such an O-ring 14 is interposed between the housing opening of the actuator 11 and one surface of the casing of the driver device 12, whereby the sealing portion 14 of the O-ring 14 is provided.
a is compressed by the housing opening of the actuator 11 and one surface of the casing of the driver device 12, and its cross-sectional shape changes from a circular shape to a substantially elliptical shape. At this time, a compression reaction force is generated in the sealing portion 14a, and the housing opening of the actuator 11 is thereby sealed. At the same time, the vibration damping portion 14b provided to protrude outward from the outer peripheral surface of the sealing portion 14a is also compressed by the housing opening of the actuator 11 and the driver device 12, and has a compression reaction force. . In addition, since the vibration damping portion 14b is thicker than the sealing portion 14a, the compression reaction force generated in the vibration damping portion 14b is larger than the compression reaction force generated in the sealing portion 14a. For this reason, even if vibration is applied from the actuator 11 side to the driver device 12 due to the operation of the actuator 11 and the valve lift amount variable mechanism provided with the actuator 11, the vibration control unit 14 b can The applied vibration is absorbed, relaxed, or suppressed by the vibration damping function, and the vibration transmitted to the driver device 12 is reliably reduced.

  In addition, as described above, the damping portion 14b is a straight line on which the distance between the fastening portion between the housing opening of the actuator 11 and one surface of the casing of the driver device 12 and the outer peripheral surface of the sealing portion 14a is the shortest. In other words, when the length of the connecting portion 14c projecting outward from the sealing portion 14a is constant, the connecting portion 14b is disposed at a position where the pressure applied to the damping portion 14b is the largest. For this reason, the compression rate of the vibration damping portion 14b and the compression reaction force accompanying this compression become larger, and the vibration reducing effect by the vibration damping portion 14b is naturally increased.

  Further, in the O-ring 14, the connecting portion 14c that connects the sealing portion 14a and the vibration damping portion 14b is thinner than the sealing portion 14a. For this reason, the influence which this connection part 14c has on the sealing function by the sealing part 14a and the damping function by the damping part 14b can be almost ignored. In particular, since the entire sealing portion 14a is compressed uniformly, the sealing between the housing opening of the actuator 11 and one surface of the casing of the driver device 12 is reliably maintained. It becomes like this.

  FIGS. 6A and 6B mainly illustrate specific dimensions of the sealing portion 14a and the vibration damping portion 14b including the corresponding grooves. As shown in FIGS. 6A and 6B, the median value thereof is “2 mm” for the wire diameter W1 of the sealing portion 14a, and the depth h1 of the groove formed in the housing opening of the actuator 11 is “1.5 mm” and the groove width G1 is “2.825 mm”. Further, the height H of the damping part 14 b is “4 mm” which is twice the wire diameter W 1 of the sealing part 14 a, and the width (cylinder diameter) W 2 is “2 mm”, and is formed in the housing opening of the actuator 11. The depth h2 of the groove is “2.9 mm”, and the groove width G2 is “3.5 mm”. The respective dimensional tolerances are “W1 = 0.1 mm”, “h1 = 0.05 mm”, “G1 = 0.125 mm”, “H = 0.1 mm”, “W2 = 0.1 mm”, “ h2 = 0.05 mm ”and“ G2 = 0.125 mm ”, and the tolerances of the corresponding portions of the sealing portion 14a and the vibration damping portion 14b are set to the same value. Further, as shown in FIG. 6, the compression ratios Ca and Cb and the filling ratios Fa and Fb when the O-ring 14 is interposed between the actuator 11 and the driver device 12 are as follows. The compression ratios Ca and Cb and the filling ratios Fa and Fb are values that serve as indices when evaluating the function of the O-ring 14 and the state of interposing.

The compression ratio Ca of the sealing portion 14a is defined by the following equation (1).
Ca = 1-h1 / W1 (1)
The lower limit value is “0.184”, the median value is “0.250”, and the upper limit value is “0.310”, and the function of sealing the opening of the actuator 11 with respect to the sealing portion 14a. Satisfies the target value of the compression ratio Ca at the time of providing “0.08 to 0.3”.

Further, the filling factor Fa of the sealing portion 14a is defined by the following equation (2).
Fa = (3.14 × W1 × W1) / (4 × G × h1) (2)
The lower limit value is “0.620”, the median value is “0.741”, and the upper limit value is “0.884”, which also seals the opening of the actuator 11 with respect to the sealing portion 14a. The upper limit value of the filling rate Fa when providing the function to be satisfied is “0.9” or less.

On the other hand, the compression ratio Cb of the vibration control unit 14b is defined by the following equation (3).
Cb = 1−h2 / H (3)
The lower limit value is “0.244”, the median value is “0.275”, and the upper limit value is “0.305”, which is an upper limit value defined by the damping as the vibration damping portion 14b. It satisfies about 0.3 "or less.

Further, the filling rate Fb of the damping unit 14b is defined by the following equation (4).
Fb = (H × W2) / (h2 × G2) (4)
The lower limit value is “0.744”, the median value is “0.788”, and the upper limit value is “0.895”, which is also the upper limit value defined by the attenuation as the vibration damping portion 14b. Is below "0.9".

  Thus, the sealing portion 14a of the O-ring 14 satisfies the target value for the compression rate Ca and the upper limit value for the filling rate Fa, and the housing opening of the actuator 11 serves as the O-ring 14. The function of sealing is sufficiently secured by the sealing portion 14a. Further, in the vibration damping portion 14b, by making the height H twice the wire diameter W1 of the sealing portion 14a, when the dimensional tolerances of the corresponding portions are the same as described above, The compression rate Cb suppresses the decay of the vibration damping portion 14b itself and satisfies the upper limit value that can maintain the durability, while the lower limit value and the median value are larger than those in the sealing portion 14a. . In addition, the vibration damping portion 14b has a circular bottom surface, that is, a surface in contact with the groove bottom of the housing opening of the actuator 11 facing the casing of the driver device 12, and a rectangular cross section perpendicular to the bottom surface. It has become. For this reason, not only when the compression rate Cb is at the above upper limit value, but also when the compression rate Cb is at the above lower limit value, at least the area of the contact surface between the casing of the driver device 12 and the housing opening of the actuator 11 is limited. The area of the bottom surface of the vibration portion 14b is secured, and the contact area is larger than that of the sealing portion 14a having a circular cross section. That is, it can be said that the shape of the vibration damping portion 14b is a more preferable shape in order to obtain an effect of suppressing vibration transmitted from the actuator 11 side.

As described above, according to the driver device integrated actuator according to the present embodiment, the following effects can be obtained.
(1) The O-ring 14 is provided with a vibration damping portion 14b that is thicker than the ring-shaped sealing portion 14a. Thereby, when the O-ring 14 is interposed between the housing opening of the actuator 11 and one surface of the casing of the driver device 12, the compression reaction force generated in the vibration damping portion 14b is generated in the sealing portion 14a. It becomes larger than the compression reaction force. For this reason, even if vibration is applied from the actuator 11 side to the driver device 12 due to the operation of the actuator 11 and the valve lift amount variable mechanism provided with the actuator 11, the applied vibration is not affected by the damping unit 14b. Is absorbed, mitigated, or suppressed.

  (2) The vibration damping portion 14b is provided on the O-ring 14 in such a manner that the vibration damping portion 14b is connected to the sealing portion 14a via a connecting portion 14c protruding outward from the outer peripheral surface of the ring of the sealing portion 14a. did. Thus, it becomes possible to set the vibration damping function as the vibration damping portion 14b, that is, the shape, dimensions, etc. independently of the sealing function for the housing opening of the actuator 11 by the sealing portion 14a. This can be realized easily.

  (3) The shape of the damping part 14b formed thicker than the sealing part 14a is a columnar shape. As a result, the contact area between the contact surface between the vibration damping portion 14b and the housing opening of the actuator 11 and the contact surface between the vibration damping portion 14b and one surface of the casing of the driver device 12 is at least the area of the bottom surface of the vibration damping portion 14b. For example, as compared with the case where the shape of the vibration damping portion 14b is a sphere having the same thickness as the cylinder, the vibration damping effect as the vibration damping portion 14b, that is, the vibration reduction effect is also achieved. It becomes easier to obtain.

  (4) The vibration damping portion 14b is arranged in a straight line connecting the fastening portions of the actuator 11 and the driver device 12 and the ring outer peripheral surface of the sealing portion 14a with the shortest distance. As a result, the compression rate Cb of the vibration damping portion 14b and the compression reaction force accompanying this compression become larger, and the vibration reducing effect by the vibration damping portion 14b is naturally increased.

  (5) About the connection part 14c which connects the sealing part 14a and the damping part 14b, this was made thinner than the sealing part 14a. Thereby, the influence which the connection part 14c which connects the sealing part 14a which functions independently, and the damping part 14b has on the sealing function by these sealing parts 14a and the damping function by the damping part 14b can be disregarded. It becomes like this. Particularly, the entire sealing portion 14a is compressed uniformly, and the sealing function corresponding to the housing opening of the actuator 11 by the sealing portion 14a is also reliably maintained.

  (6) The height H of the vibration damping portion 14b having a columnar shape is set to be twice the wire diameter W1 of the sealing portion 14a having a ring shape. As a result, when the dimensional tolerances of the corresponding portions of the vibration damping portion 14b and the sealing portion 14a are the same, the compression ratio Cb suppresses the loss of the vibration damping portion 14b itself, and the durability thereof is reduced. While satisfying the upper limit value that can be maintained, the lower limit value and the median value can be made larger than those values in the sealing portion 14a.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
The dimensions of the sealing portion 14a of the O-ring 14, the damping portion 14b, and the groove of the housing opening of the actuator 11 into which these are fitted are not limited to the examples shown in FIGS. What is necessary is just a dimension which the compression rate Cb in the vibration part 14b exceeds the compression rate Ca in the sealing part 14a.

  -Although the number of the damping parts 14b provided in the O-ring 14 is four, it is not limited to this, and is appropriately changed according to the shape of the housing opening of the actuator 11, the method of assembling the driver device 12 with the casing, etc. Is possible.

  The position where the vibration damping portion 14b is arranged is not limited to a straight line connecting the fastening portion of the actuator 11 and the driver device 12 and the sealing portion 14a with the shortest distance, but on the housing opening of the actuator 11 Other positions may be used. Even with such a configuration, the effects (1) to (3), (5), and (6) can be obtained.

  The shape of the vibration damping portion 14b is not limited to a columnar shape, but may be a columnar body having a rectangular cross section perpendicular to the O-ring arrangement surface, such as a prismatic shape, or a spherical body. Even if the damping part 14b is a sphere, for example, the effect of the above (1), (2), (4) to (6) can be obtained as long as it is thicker than the sealing part 14a. it can.

  The driver device integrated actuator according to the present invention is not limited to the actuator provided in the variable valve lift amount mechanism and its application to the driver device. The point is that one side of the casing of the driver device that electrically drives the actuator housing in such a manner that its opening is closed with an O-ring against the housing of the actuator that is driven by electricity while being lubricated with lubricating oil. It can be similarly applied if it is fastened.

The side view which shows the side structure about one Embodiment of the driver apparatus integrated actuator which concerns on this invention. The front view which shows the front structure which looked at the driver apparatus integrated actuator of the embodiment from the driver apparatus side. The front view which shows the actuator front structure which looked at the driver apparatus integrated actuator of the same embodiment from the AA line cross section side of FIG. 1 which is a coupling | bond part with a driver apparatus. The enlarged plan view which expands and shows the planar structure of O-ring employ | adopted for the driver apparatus integrated actuator of the embodiment. FIG. 5 is an enlarged cross-sectional view showing, in an enlarged manner, a cross-sectional structure of an O-ring along line B-B in FIG. 4 and a cross-sectional structure of a groove formed in a housing opening of an actuator so as to fit the O-ring. (A), (b) is a characteristic view which shows the example of a characteristic of the sealing part and damping part of an O-ring, respectively. The top view which shows schematic structure of a variable valve mechanism provided with a valve timing variable mechanism and a valve lift amount variable mechanism. The perspective view which shows the perspective structure of the variable valve mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11, 27 ... Actuator, 12, 29 ... Driver apparatus, 13 ... Connector, 14 ... O-ring, 14a ... Sealing part, 14b ... Damping part, 14c ... Connection part, 15a, 15b, 15c, 15d ... Bolt, 16a 16b, 16c, 16d ... bolt groove (female thread), 17 ... electric motor, 18 ... rotation-linear motion conversion mechanism, 21 ... intake camshaft, 21a ... intake cam, 22 ... variable valve timing mechanism for intake valve, 23 ... Exhaust camshaft, 24 ... Valve timing variable mechanism for exhaust valve, 25 ... Control shaft, 26 ... Mediation drive mechanism, 28 ... Control device.

Claims (12)

In the driver device integrated actuator having an electrically driven actuator, a driver device for driving the actuator, and an O-ring disposed between an opening of the actuator housing and one surface of the casing of the driver device,
The opening of the housing has a groove in which the O-ring is disposed,
The O-ring has a ring-shaped sealing portion, a plurality of vibration damping portions, and a plurality of connecting portions,
The sealing portion has a shape for sealing the opening of the housing,
The plurality of connecting portions project outward from the outer peripheral surface of the sealing portion, and connect the sealing portion and each of the plurality of vibration damping portions to each other,
The groove has a first groove part in which the sealing part is arranged, a second groove part in which the vibration damping part is arranged, and a third groove part in which the coupling part is arranged,
When the sealing portion is not compressed by the opening of the housing and one surface of the casing, the dimension of the sealing portion corresponding to the depth direction of the first groove portion is the height of the sealing portion. The height of the sealing part is larger than the depth of the first groove part,
When the vibration control part is not compressed by the opening of the housing and one surface of the casing, the dimension of the vibration control part corresponding to the depth direction of the second groove part is the height of the vibration control part. A height of the vibration damping portion is greater than a depth of the second groove portion and greater than a height of the sealing portion;
The compression ratio of the sealing portion in a state where the sealing portion is compressed by the opening of the housing and one surface of the casing is defined as a first compression rate, and the vibration control portion is disposed on the opening of the housing and one surface of the casing. When the compression rate of the vibration damping part in the state compressed by the second compression rate is, the second compression rate is larger than the first compression rate,
The first compression rate indicates “(height of the sealing portion−depth of the first groove portion) / height of the sealing portion”,
The driver device integrated actuator, wherein the second compression ratio indicates “(height of the damping unit−depth of the second groove) / height of the damping unit”. With a cross section of the O ring parallel to the radial direction of the O ring and the depth direction of the groove as a reference cross section,
The depth of the first groove portion indicates a dimension from the opening portion of the first groove portion to the bottom surface of the first groove portion in the reference cross section,
The depth of the second groove portion indicates the dimension from the opening of the second groove portion to the bottom surface of the second groove portion in the reference cross section,
The height of the sealing portion indicates the dimension of the sealing portion in a state where the sealing portion is not compressed by the opening of the housing and one surface of the casing in the reference cross section,
2. The driver according to claim 1, wherein the height of the vibration suppression unit indicates a dimension of the vibration suppression unit in a state where the vibration suppression unit is not compressed by the opening of the housing and one surface of the casing in the reference cross section. Device integrated actuator. The depth of the third groove portion indicates the dimension from the opening of the third groove portion to the bottom surface of the third groove portion in the reference cross section, and is smaller than the depth of the first groove portion and the depth of the second groove portion. The driver device integrated actuator according to claim 2. When the connecting portion is not compressed by the opening of the housing and one surface of the casing, the connecting portion corresponding to the depth direction of the third groove is the height of the connecting portion. The driver device-integrated actuator according to any one of claims 1 to 3, wherein the height of the driver device is smaller than a height of the sealing portion and a height of the vibration damping portion. In the state where the sealing portion is not compressed by the opening of the housing and one surface of the casing, when the dimension of the sealing portion corresponding to the width direction of the first groove portion is the width of the sealing portion, The driver device integrated actuator according to claim 1, wherein a width of the sealing portion is smaller than a width of the first groove portion. In the state where the vibration damping part is not compressed by the opening of the housing and one surface of the casing, the dimension of the vibration damping part corresponding to the width direction of the second groove part is the width of the vibration damping part. The driver device integrated actuator according to any one of claims 1 to 5, wherein a width of the vibration damping portion is smaller than a width of the second groove portion. The driver device integrated actuator according to claim 5, wherein a width of the sealing portion is equal to a width of the vibration damping portion. The driver device integrated actuator according to claim 1, wherein a width of the second groove portion is larger than a width of the first groove portion. The width of the first groove portion indicates the dimension of the first groove portion in a direction orthogonal to the depth direction of the first groove portion in the reference cross section,
The width of the second groove portion indicates the dimension of the second groove portion in a direction orthogonal to the depth direction of the second groove portion in the reference cross section,
The width of the sealing portion indicates the dimension of the sealing portion in a state where the sealing portion is not compressed by the opening of the housing and one surface of the casing in the reference cross section,
The width of the damping unit indicates a dimension of the damping unit in a state where the damping unit is not compressed by the opening of the housing and one surface of the casing in the reference cross section. Item 9. The driver device integrated actuator according to any one of Items 5 to 8. The driver device integrated actuator has a plurality of bolts for fixing the housing and the casing to each other,
The opening of the housing has a plurality of insertion portions for inserting each of the plurality of bolts,
The plurality of insertion portions are formed outside the groove.
The driver device integrated actuator according to any one of claims 1 to 9 . A plane along the end face of the opening of the housing as a reference plane,
The plurality of insertion portions are formed at positions where each of the plurality of insertion portions has a one-to-one relationship with each of the plurality of vibration damping portions,
An imaginary line segment connecting the corresponding insertion portion and the vibration damping portion passes through the central axis of the sealing portion.
The driver device integrated actuator according to claim 10 . The actuator has an electric motor and a rotation / linear motion conversion mechanism,
The rotation / linear motion conversion mechanism converts the rotary motion of the electric motor into linear motion, and drives the control shaft of the variable valve lift amount mechanism of the internal combustion engine by the linear motion after the conversion.
The driver device integrated actuator according to any one of claims 1 to 11 .

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