JP6003868B2 - Variable valve gear - Google Patents

Description

  The present invention relates to a variable valve gear.

  2. Description of the Related Art A variable valve device that variably controls a working angle of a cam that drives an intake valve or an exhaust valve mounted on an internal combustion engine is known (see, for example, Patent Document 1).

JP2013-142352A

  FIG. 8 is a view showing a main part of a variable valve operating apparatus 1 ′ which is an example of a variable valve operating apparatus. The mechanism of power transmission of the variable valve operating apparatus 1 ′ is roughly as follows. That is, in the variable valve gear 1 ′, the drive arm portion 4 ′ rotates together with the drive shaft member 2 ′. Then, the first link member 6a ′ and the second link member 6b ′ corresponding to the link member transmit the rotation of the drive arm portion 4 ′ to the cam shaft member 3 ′ via the drive disk 5 ′ corresponding to the rotation member. .

  The mechanism for changing the operating angle of the variable valve operating apparatus 1 ′ is roughly as follows. That is, the drive disk 5 'rotates along the inner peripheral wall surface of the eccentric hole of the control sleeve 8'. The control sleeve 8 ′ changes the rotational speed of the cam shaft member 3 ′ during one rotation of the drive shaft member 2 ′ by changing the position of the central axis of the eccentric hole. As a result, the working angle of the intake valve and the exhaust valve is made variable with a constant lift amount.

  In the variable valve operating apparatus 1 ′, the drive disk 5 ′ applies a radial load F3 to the control sleeve 8 ′ according to the driving force input F1 and the output reaction force F2 during power transmission. The direction and size of the load F3 change with the rotation of the drive shaft member 2 ′. As a result, the control sleeve 8 'swings. When the control sleeve 8 'swings, the valve lift curve may be distorted.

  In view of the above problems, an object of the present invention is to provide a variable valve operating apparatus that can prevent or suppress the occurrence of distortion of a valve lift curve due to swinging of a control sleeve.

  The present invention provides a drive shaft member that rotates in synchronization with a crankshaft included in an internal combustion engine, a cam shaft member that is provided around the drive shaft member, and is provided on the drive shaft member. A control arm that is provided with a drive arm portion that rotates together with the drive shaft member, an eccentric hole, the drive shaft member is inserted into the eccentric hole, and a position of the central axis of the eccentric hole can be changed, and A rotating member that rotates along the inner peripheral wall surface of the eccentric hole, a link member that transmits the rotation of the driving arm portion to the camshaft member via the rotating member, and the control sleeve that is the center of the driving shaft member A double-row bearing supported coaxially with the shaft, and provided on both sides of the control sleeve in the axial direction of the drive shaft member; A variable valve device and a contact portion for regulating the movement of Rusuribu.

  According to the present invention, it is possible to prevent or suppress the distortion of the valve lift curve due to the swinging of the control sleeve.

It is a 1st perspective view which shows the principal part of a variable valve apparatus. It is a 2nd perspective view which shows the principal part of a variable valve apparatus. It is a 3rd perspective view which shows the principal part of a variable valve apparatus. It is a front view which shows the principal part of a variable valve apparatus. It is sectional drawing which shows the principal part of a variable valve apparatus. It is a cross-sectional perspective view which shows the principal part of a variable valve apparatus. It is a figure which shows a control sleeve. It is a figure which shows the principal part of an example of a variable valve apparatus.

  Embodiments of the present invention are described with reference to the drawings.

FIG. 1 is a first perspective view showing a main part of the variable valve operating apparatus 1. FIG. 2 is a second perspective view showing the main part of the variable valve operating apparatus 1. FIG. 3 is a third perspective view showing the main part of the variable valve operating apparatus 1. FIG. 4 is a front view showing a main part of the variable valve operating apparatus 1. FIG. 5 is a cross-sectional view showing a main part of the variable valve operating apparatus 1. FIG. 6 is a cross-sectional perspective view showing a main part of the variable valve operating apparatus 1.
1 to 6 show the variable valve gear 1 centering on the portion corresponding to the rearmost cylinder among the plurality of cylinders of the internal combustion engine. 2 and 3 show the rocker arm 51 and the rocker roller 52 together with the variable valve operating device 1. In FIG. 4, the drive shaft member 2, the control sleeve 8, and the first bearing 9 are shown as the main parts of the variable valve apparatus 1. In FIG. 5, the principal part of the variable valve apparatus 1 is shown by the AA cross section shown in FIG. In FIG. 6, the principal part of the variable valve apparatus 1 is shown by the BB cross section shown in FIG.

  The variable valve operating apparatus 1 includes a drive shaft member 2 that rotates in synchronization with a crankshaft included in the internal combustion engine. The variable valve operating apparatus 1 includes a cam shaft member 3 that is rotatably provided around a drive shaft member 2. The cam shaft member 3 has a cam lobe 3a. The variable valve operating apparatus 1 includes a drive arm unit 4 that is provided on the drive shaft member 2 and rotates together with the drive shaft member 2. The variable valve operating apparatus 1 includes a drive disk 5 corresponding to a rotating member and a control sleeve 8. The drive disk 5 rotates along the inner peripheral wall surface 8a1 of the eccentric hole 8a provided in the control sleeve 8.

  The drive shaft member 2 is a hollow rod-like body, and includes an oil supply hole 2 c for supplying lubricating oil and a pin hole 2 d for fixing the drive arm portion 4 to the drive shaft member 2 using the coupling pin 13. Yes. The pin hole 2d is provided corresponding to each cylinder of the internal combustion engine.

  The cam shaft member 3 is a cylindrical member, and includes two cam lobes 3a corresponding to the number of valves that are intake valves or exhaust valves for each cylinder. The cam shaft member 3 is rotatably provided around the drive shaft member 2 so that the rotation center axis thereof coincides with the center axis AX of the drive shaft member 2. The cam lobe 3a includes a nose portion and a base circle portion. Of the two cam lobes 3a, a pin joint 3b is provided on the side surface of one cam lobe 3a. One end of the second link member 6b is connected to the pin joint portion 3b. Such a camshaft member 3 is prepared for each cylinder and is rotatably provided around the drive shaft member 2. The cam lobe 3a contacts the rocker roller 52 provided in the rocker arm 51 and lifts the intake valve or the exhaust valve.

  The drive arm part 4 is a cylindrical member and includes a cylindrical part 4a and a plate-like part 4b serving as an arm. The drive arm portion 4 is fixed to the drive shaft member 2 so that the central axis of the cylindrical portion 4 a coincides with the central axis AX of the drive shaft member 2. The tubular portion 4a is provided with a pin hole 4a1 into which the coupling pin 13 is inserted in order to fix and integrate the drive arm portion 4 to the drive shaft member 2. The plate-like portion 4b is provided with a pin insertion hole 4b1 for connecting one end of the first link member 6a. Such a drive arm portion 4 is prepared for each cylinder and is fixed to the drive shaft member 2 by a coupling pin 13. That is, the drive arm portion 4 is provided integrally with the drive shaft member 2 and rotates together with the drive shaft member 2. The drive arm portion 4 is disposed adjacent to the cam shaft member 3. At this time, the drive arm portion 4 is attached to the drive shaft member 2 so as not to interfere with the pin joint portion 3b included in the cam shaft member 3.

  The drive disk 5 includes a plate-like portion 5a and a cylindrical portion 5d. Here, one surface side of the plate-like portion 5a is referred to as a first surface 5a1, and a surface that is the back surface side of the first surface 5a1 is referred to as a second surface 5a2. The cylindrical portion 5d is provided on the second surface 5a2 side. The drive disk 5 corresponds to a rotating member and rotates along the inner peripheral wall surface 8a1 of the eccentric hole 8a provided in the control sleeve 8. A cylindrical portion 5d is inserted into the eccentric hole 8a. The rotation center axis of the drive disk 5 coincides with the center axis AXdd of the eccentric hole 8a. A first bearing 9 is interposed between the inner peripheral wall 8a1 of the eccentric hole 8a and the cylindrical portion 5d.

  The plate-like portion 5a of the drive disk 5 is provided with a first pin coupling portion 5c1 and a second pin coupling portion 5c2. The first pin coupling portion 5c1 is provided with a first pin insertion hole. The second pin coupling portion 5c2 is provided with a second pin insertion hole. The first pin coupling portion 5c1 is a connection position of the first link member 6a, and the second pin coupling portion 5c2 is a connection position of the second link member 6b. The first pin coupling portion 5c1 and the second pin coupling portion 5c2 are provided on the drive disk 5 with a separation of 180 °. That is, the first pin coupling portion 5 c 1 and the second pin coupling portion 5 c 2 are provided at positions facing each other on the drive disk 5.

  The first link member 6a includes two pin insertion holes 6a1. Similarly, the second link member 6b includes two pin insertion holes 6b1. The first link member 6a and the second link member 6b have the same shape. The first link member 6 a and the second link member 6 b are link members that transmit the rotation of the drive arm portion 4 to the camshaft member 3 via a drive disk 5 corresponding to a rotating member. One end side of the first link member 6a is connected to the drive arm portion 4 using the first connecting pin 7a, and the other end side is connected to the drive disk 5 using the second connecting pin 7b. Specifically, the first connecting pin 7a is inserted into the pin insertion hole 4b1 provided in the arm portion 4b and the pin insertion hole 6a1 on one end side of the first link member 6a, and the arm portion 4b and the first link member 6a. Are connected to each other by pin coupling. Then, the second connecting pin 7b is inserted through the pin insertion hole 6a1 on the other end side of the first link member 6a and the first pin insertion hole provided in the first pin coupling portion 5c1 of the drive disk 5, and the first The link member 6a and the first pin coupling portion 5c1 are connected by pin coupling. Thereby, the rotation of the drive arm unit 4 is transmitted to the drive disk 5.

  One end side of the second link member 6b is connected to the drive disk 5 using the third connecting pin 7c, and the other end side is connected to the camshaft member 3 using the fourth connecting pin 7d. Specifically, the third connecting pin 7c is inserted into the second pin insertion hole provided in the second pin coupling portion 5c2 of the drive disk 5 and the pin insertion hole 6b1 on the one end side of the second link member 6b. The 2-pin coupling portion 5c2 and the second link member 6b are connected by pin coupling. Then, the fourth link pin 7d is inserted into the pin insertion hole 6b1 on the other end side of the second link member 6b and the pin insertion hole 3b1 provided in the pin joint portion 3b of the cam shaft member 3, and the second link member 6b and the cam shaft member 3 are connected by pin coupling. Thereby, the rotation of the drive disk 5 is transmitted to the cam shaft member 3. Thus, the first link member 6 a and the second link member 6 b transmit the rotation of the drive arm portion 4 to the cam shaft member 3 via the drive disk 5.

  Both the first link member 6a and the second link member 6b are arranged on the first surface 5a1 side of the plate-like portion 5a provided in the drive disk 5. And the control sleeve 8, the 2nd bearing 10, the 3rd bearing 11, and the cap 12 are arrange | positioned at the 2nd surface 5a2 side of the plate-shaped part 5a.

  The control sleeve 8 includes an eccentric hole 8a. Moreover, the outer peripheral surface is provided with a gear portion 8b and a cylindrical portion 8c. The central axis of rotation of the control sleeve 8 coincides with the central axis of the inner circumference of the cylindrical portion 8c. This rotation center axis is different from the center axis AXdd of the eccentric hole 8a. The drive shaft member 2 is inserted through the eccentric hole 8a and the cylindrical portion 8c. Here, the center axis AX of the drive shaft member 2 inserted through the eccentric hole 8a and the cylindrical portion 8c coincides with the rotation center axis of the control sleeve 8, that is, the central axis of the cylindrical portion 8c. A cylindrical portion 5 d of the drive disk 5 is rotatably mounted in the eccentric hole 8 a via the first bearing 9. Further, the second bearing 10 and the third bearing 11 are interposed between the cylindrical portion 8 c of the control sleeve 8 and the drive shaft member 2, whereby the drive shaft member 2 is connected to the second bearing 10 and the third bearing. 11 is supported in the cylindrical portion 8c. A cap 12 is disposed outside the cylindrical portion 8c. Thus, both the drive shaft member 2 and the control sleeve 8 are mounted on the internal combustion engine.

  The gear portion 8b meshes with a gear portion included in a control shaft member (not shown), and rotates the control sleeve 8 as the control shaft member rotates. As the control sleeve 8 rotates, the position of the central axis AXdd of the eccentric hole 8a changes. The operating angle at the reference position is set as a reference operating angle, and from this state, the control sleeve 8 is rotated to one side, and the rotational speed of the camshaft member 3 increases during the valve opening period, and the camshaft member 3 during the valve closing period. To slow down the rotation speed. When the drive shaft member 2 rotates in this state, the valve opening timing is advanced and the valve closing timing is delayed, so that the operating angle is increased. When the control sleeve 8 is rotated from the reference position to the other side, the operating angle becomes small.

  The camshaft member 3, the drive arm portion 4, the drive disk 5, and the control sleeve 8 are provided for each cylinder. The cam shaft member 3 and the drive arm portion 4 are mounted with the drive shaft member 2 inserted. The drive arm unit 4 is fixed to the drive shaft member 2 by using a coupling pin 13. A control sleeve 8 incorporating the drive disk 5 in which the first bearing 9 is mounted on the cylindrical portion 5d of the drive disk 5 and the first link member 6a and the second link member 6b are attached to the first surface 5a1 side is provided. Installed. Then, the second bearing 10 and the third bearing 11 are attached to the cylindrical portion 8 c located on the rear end side in the control sleeve 8.

  The second bearing 10 and the third bearing 11 are adjacent to each other along the axial direction of the drive shaft member 2. The third bearing 11 is provided behind the second bearing 10. The second bearing 10 and the third bearing 11 support the control sleeve 8 coaxially with the central axis AX of the drive shaft member 2. Being coaxial includes that the axes are different within a range of manufacturing error and manufacturing tolerance. The second bearing 10 and the third bearing 11 correspond to double row bearings. Specifically, for example, ball bearings can be applied to the second bearing 10 and the third bearing 11.

  A flange 21 and a spacer 22 are further provided on the rear side of the control sleeve 8 in the axial direction of the drive shaft member 2. The flange 21 has a cylindrical shape. The flange 21 includes a tip 21a. The inner ring of the third bearing 11 comes into contact with the tip portion 21a. The flange 21 is provided with a pin hole 21b into which the coupling pin 14 is inserted. The drive shaft member 2 is provided with a pin hole 2 e for fixing the flange 21 to the drive shaft member 2 using the coupling pin 14. The flange 21 is mounted so as to pass through the drive shaft member 2 from the rear side, and is fixed to the drive shaft member 2 by a coupling pin 14. The coupling pin 14 may have the same shape as the coupling pin 13. The pin hole 2e may have the same shape as the pin hole 2d.

  The spacer 22 is a ring-shaped member, and is provided on the flange 21 so as to insert the distal end portion 21a. The spacer 22 is provided between the control sleeve 8 and the flange 21 along the axial direction of the drive shaft member 2. A slight gap is provided between the control sleeve 8 and the spacer 22. The spacer 22 abuts the control sleeve 8 to restrict the movement of the control sleeve 8. That is, the spacer 22 is provided on the flange 21 fixed to the drive shaft member 2. For this reason, when the control sleeve 8 contacts the spacer 22, the spacer 22 contacts the flange 21. As a result, the movement of the control sleeve 8 is restricted. The inner ring of the third bearing 11 can come into contact with the flange 21 by attaching the spacer 22 to the tip 21 a.

  In the cylinders other than the rearmost cylinder among the plurality of cylinders, the spacer 22 can be provided so as to be interposed between the control sleeve 8 and the cam shaft member 3. In this case, when the control sleeve 8 comes into contact with the spacer 22, the spacer 22 comes into contact with the cam shaft member 3. The movement of the control sleeve 8 is restricted by the camshaft member 3 coming into contact with the drive arm portion 4. In this case, the cam shaft member 3 includes a tip portion 3c having the same shape as the tip portion 21a of the flange 21. The specific shape of the spacer 22 may be different between the cylinder on the most rear side among the plurality of cylinders and the other cylinders.

  A slight gap is provided between the drive arm portion 4 and the control sleeve 8. For this reason, on the front side of the control sleeve 8, the drive arm portion 4 abuts the control sleeve 8 to restrict the movement of the control sleeve 8. Specifically, the rear end portion 4a2 of the cylindrical portion 4a of the drive arm portion 4 abuts the control sleeve 8 to restrict the movement of the control sleeve 8. The spacer 22 and the rear end portion 4a2 correspond to contact portions.

  FIG. 7A to FIG. 7E are views showing the control sleeve 8. FIG. 7A is a front view of the control sleeve 8. FIG. 7B is a first perspective view of the control sleeve 8. FIG. 7C is a second perspective view of the control sleeve 8. FIG. 7D is a third perspective view of the control sleeve 8. FIG. 7E is a cross-sectional view of the control sleeve 8.

  The control sleeve 8 includes a protrusion 8d. The central axis of the protrusion 8d coincides with the central axis AXdd of the eccentric hole 8a. For this reason, the protrusion 8d has a partial cylindrical shape in which a part thereof is missing in the circumferential direction so as not to interfere with the drive shaft member 2. The protrusion 8d is accommodated in the cylindrical portion 5d of the drive disk 5 as shown in FIGS. A taper or arc-shaped relief process 8e may be provided on the inner side of the tip of the protrusion 8d, whereby contact between the protrusion 8d and the drive shaft member 2 when the control sleeve 8 is inclined can be avoided. The insertion hole 8f is a hole for inserting a tool when the first bearing 9 is removed. The insertion groove 8g is a groove into which a tool is inserted when the second bearing 10 and the third bearing 11 are removed.

  The cylindrical portion 8 c has one end portion of the control sleeve 8. The protrusion 8 d has the other end of the control sleeve 8. As can be seen from FIG. 5 and FIG. 6, the control sleeve 8 specifically contacts the spacer 22 and the rear end 4a2 corresponding to the abutting portions at both ends of the cylindrical portion 8c and the protruding portion 8d. For example, the outer ring of the third bearing 11 may abut on the spacer 22 instead of the cylindrical portion 8c. Therefore, both ends of the control sleeve 8 or the combination of the control sleeve 8 including the member integrated with the control sleeve 8 (here, the outer ring of the third bearing 11) are the spacer 22 and the rear end corresponding to the contact portion. What is necessary is just to contact | abut to the part 4a2.

  Next, main effects of the variable valve gear 1 will be described. The variable valve operating apparatus 1 includes the second bearing 10 and the third bearing 11 so that the tilt of the control sleeve 8 can be suppressed. As a result, it is possible to limit the movement of the control sleeve 8 to be swung to substantially the axial movement. Furthermore, the variable valve operating apparatus 1 can suppress the movement of the control sleeve 8 in the axial direction by providing the spacers 22 and the control sleeve 8 with the protrusions 8d. As a result, the occurrence of distortion of the valve lift curve due to the swinging of the control sleeve 8 can be prevented or suppressed. The variable valve operating apparatus 1 can prevent or suppress, for example, damage to the variable valve operating apparatus 1 by preventing or suppressing the occurrence of distortion in the valve lift curve.

  In the variable valve operating apparatus 1 having such a configuration, a commercially available ball bearing can be applied to the second bearing 10 and the third bearing 11. For this reason, the variable valve operating apparatus 1 can be configured to be advantageous in terms of cost in suppressing the swing of the control sleeve 8. The variable valve operating apparatus 1 can be configured to be advantageous in terms of compactness and weight reduction by providing the protrusion 8d so as to be accommodated in the cylindrical portion 5d of the drive disk 5.

  The above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to these, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

Variable valve gear 1, 1 '
Drive shaft member 2, 2 '
Cam shaft member 3, 3 '
Drive arm part 4, 4 '
Tip 4a2
Drive disk 5, 5 '
1st link member 6a, 6a '
Second link member 6b, 6b '
Control sleeve 8, 8 '
Eccentric hole 8a
Gear part 8b
Cylindrical part 8c
Projection 8d
Second bearing 10
Third bearing 11
Spacer 22

Claims (1)

A drive shaft member that rotates in synchronization with a crankshaft included in the internal combustion engine;
A camshaft member having a cam lobe and rotatably provided around the drive shaft member;
A drive arm provided on the drive shaft member and rotating together with the drive shaft member;
A control sleeve provided with an eccentric hole, the drive shaft member being inserted through the eccentric hole, and a position of the central axis of the eccentric hole being changeable;
A rotating member that rotates along an inner peripheral wall surface of the eccentric hole;
A link member that transmits the rotation of the drive arm portion to the camshaft member via the rotating member;
A double row bearing for supporting the control sleeve coaxially with the central axis of the drive shaft member;
A variable valve operating apparatus comprising: a contact portion provided on both sides of the control sleeve in the axial direction of the drive shaft member and restricting movement of the control sleeve.

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