JP4630228B2 - Variable valve mechanism for internal combustion engine and method for assembling the same - Google Patents

Description

  The present invention relates to a variable valve mechanism that changes a valve lift amount, a working angle, and a timing continuously or stepwise in accordance with an operating state of an internal combustion engine.

  Among this type of variable valve mechanism, like the variable valve mechanism 78 of Conventional Example 1 shown in FIGS. 6 (a) and 6 (b), it is supported on the same axis X so as to be swingable. An intermediary drive mechanism 80 that includes an input unit 81 and an output unit 82, and drives the valve 8 by the output unit 82 when the input unit 81 is driven by the rotary cam 79, and the relative rotation between the input unit 81 and the output unit 82. Some include a rotation phase difference variable mechanism 83 that varies the dynamic phase difference (Patent Document 1).

  The rotation phase difference variable mechanism 83 includes a substantially cylindrical slider gear 84 that engages helical splines having different angles with each other between the input unit 81 and the output unit 82, and axial directions F and R on the axis X. An engagement pin 86 projecting from the control shaft 85 is inserted into a slit hole 88 extending in the circumferential direction that extends through the slider gear 84. The engagement pin 86 is inserted into the slider gear 84. When both inner side surfaces of the slit hole 88 are in sliding contact with the outer peripheral surface of 86, the slider gear 84 is engaged with the control shaft 85 in the axial directions F and R and slidable in the circumferential direction. .

  However, when the inner side surface of the slit hole 88 is in direct sliding contact with the engaging pin 86 as described above, the vibration generated between the inner side surface and the engaging pin 86 is difficult to escape, and the slider gear 84. However, it is difficult for the engaging pin 86 to slide smoothly.

For this reason, as in the conventional example 2 shown in FIG. 6 (c), there is a type in which the vibration is easily released by extrapolating the bush 97 at the tip of the engaging pin 96. Here, the slider gear In view of problems such as the strength of 94, a bottomed slit groove 98 is recessed in the inner peripheral surface of the slider gear 94 instead of the hole-like slit hole (Patent Document 2).
JP 2001-263015 A Japanese Patent Laid-Open No. 2005-2835

  However, in the case of the structure as in Conventional Example 2, the following problem occurs during assembly. That is, when attaching the engaging pin 96 and the bush 97 to the control shaft 95, first, the bush 97 is fitted into the slit groove 98, and then the control shaft 95 and the like are inserted into the cylindrical hole of the slider gear 94, and finally Further, an engagement pin 96 is inserted through a through hole 99 penetrating the slider gear 94 and the like, and the engagement pin 96 is attached to the control shaft 95 and a bush 97 is attached to the tip thereof. Since the bush 97 can slide freely in the slit groove 98 when attaching the bush 97, it is difficult to position the bush 97 at the desired position as shown in FIG. It may go away.

  Therefore, an object is to facilitate the mounting work of the bush.

In order to achieve the above object, a variable valve mechanism for an internal combustion engine according to the present invention includes an input portion and an output portion that are arranged on the same axis so as to be swingable, and the input portion is driven by a rotating cam. Then, a variable valve mechanism for an internal combustion engine, comprising: an intermediary drive mechanism that drives the valve by the output unit; and a rotation phase difference variable mechanism that varies a relative rotation phase difference between the input unit and the output unit. In the above, the rotation phase difference variable mechanism slides in the axial direction on the axial line, and a substantially cylindrical slider gear that meshes with the helical splines having different angles from each other between the input section and the output section. Both inner surfaces of the control shaft and a bottomed slit groove that is recessed in the inner peripheral surface of the slider gear extend in the axial direction to the connecting member attached to the control shaft. To restrained and the circumferential direction is configured and a coupling mechanism comprising slidably engaged with said coupling member, from attached to the control shaft to the pin mounting hole penetrating said control shaft in a radial direction A protruding engagement pin; and a bush that is externally attached to the engagement pin and slidably contacts both inner surfaces of the slit groove. The slider gear includes an inner surface of the slit groove from the outer peripheral surface of the slider gear. There are provided a pin insertion hole for inserting the engagement pin during assembly that communicates to the bottom surface, and positioning means for temporarily positioning the bush in the slit groove when the connecting member is attached to the control shaft. The positioning means has the following form (a) or (b) .

(A) A configuration in which a concave portion is provided on the inner bottom surface of the slit groove on the opposite side of the slider gear in the radial direction with respect to the portion where the pin insertion hole of the slider gear is provided to fit the bush. .
(A) Inserting a jig for engaging the bush, which is communicated from the outer peripheral surface of the slider gear in the radial direction to the slit groove with respect to the portion where the pin insertion hole of the slider gear is provided. A form with a tool insertion hole.

  The position where the positioning means is provided is not particularly limited, but the slider gear is provided with a pin insertion hole for inserting the engagement pin into the cylindrical hole, and the positioning means is provided with the pin insertion hole. It is preferable that the slider gear is formed on the opposite side in the radial direction of the slider gear. This is because the bush can be externally inserted into the tip of the engagement pin inserted through the pin insertion hole and penetrating the control shaft.

  The following two methods (A) and (B) are shown as methods for assembling the variable valve mechanism of the internal combustion engine of the present invention.

(A) an intermediary drive mechanism that includes an input unit and an output unit supported so as to be swingable side by side on the same axis, and that drives the valve by the output unit when the input unit is driven by a rotating cam; In the assembling method of the variable valve mechanism of the internal combustion engine provided with the rotating phase difference variable mechanism that varies the relative rotating phase difference between the input unit and the output unit, the assembling method of the rotating phase difference variable mechanism is: A recess formed in an inner bottom surface of a slit groove formed in an inner peripheral surface of a substantially cylindrical slider gear that meshes with helical splines having different angles from each other between the input unit and the output unit. A bush that is slidably engaged with both inner side surfaces of the slit groove is temporarily fitted , and the bush is placed on a side opposite to the radial direction of the slider gear with respect to a pin insertion hole penetrating the slider gear. Positioning and The cylindrical bore of Idagia, after insertion of the control shaft for sliding the axis in the axial direction by inserting the engaging pin into the cylinder bore from the pin insertion holes formed through the slider gear, the engagement pin Is mounted in a pin mounting hole that penetrates the control shaft in the radial direction, and the bush is extrapolated to the tip of the engaging pin that passes through the pin mounting hole and protrudes to the opposite side. Assembling method of valve mechanism.

(B) an intermediary drive mechanism that includes an input portion and an output portion that are supported so as to be swingable side by side on the same axis, and that drives the valve at the output portion when the input portion is driven by a rotating cam; In the assembling method of the variable valve mechanism of the internal combustion engine provided with the rotating phase difference variable mechanism that varies the relative rotating phase difference between the input unit and the output unit, the assembling method of the rotating phase difference variable mechanism is: The slit grooves recessed in the inner peripheral surface of the substantially cylindrical slider gear that meshes with the helical splines having different angles from each other between the input section and the output section, and both inner surfaces of the slit grooves A bush that is slidably engaged is fitted, a jig is inserted from a hole penetrating the slider gear, the bush is temporarily locked by the jig , and the bush penetrates the slider gear. Against the pin insertion hole Positioned opposite the radial direction of the slider gear, the cylindrical hole of the slider gear, after insertion of the control shaft for sliding the axis in the axial direction, from said penetrated by said pin insertion hole in the slider gear An engagement pin is inserted into the tube hole, and the engagement pin is attached to a pin attachment hole penetrating the control shaft in the radial direction and passes through the pin attachment hole and protrudes to the opposite side of the bush. An assembly method of a variable valve mechanism for an internal combustion engine, characterized in that

  In both (A) and (B), the method of extrapolating the bush to the tip of the engagement pin is not particularly limited, but the slider gear is opposite to the radial direction of the portion where the pin insertion hole is provided. It is preferable that the bush is positioned and the bush is extrapolated to the tip of the engaging pin inserted through the pin insertion hole and penetrating the control shaft.

  According to the present invention, the mounting operation of the bush can be facilitated by providing the positioning means and temporarily positioning the bush in the slit groove.

  The variable valve mechanism 9 of the internal combustion engine 5 of the present invention includes an input portion 21 and an output portion 31 that are arranged on the same axis X and supported so as to be swingable. The input portion 21 is driven by the rotary cam 10. The intermediate drive mechanism 20 that drives the valve 8 by the output unit 31 and the rotation phase difference variable mechanism 41 that varies the relative rotation phase difference g between the input unit 21 and the output unit 31 are provided.

  The rotation phase difference variable mechanism 41 includes a substantially cylindrical slider gear 44 that meshes with helical splines having different angles from each other between the input unit 21 and the output unit 31, and an axial line X in the axial directions F and R. Both inner surfaces of the sliding control shaft 48 and the slit groove 57 extending in the circumferential directions O and C formed in the inner peripheral surface of the slider gear 44 are connected to the connecting member 53 attached to the control shaft 48 in the axial direction F. , R, and a coupling mechanism 52 that is slidably engaged in the circumferential directions O and C.

  The connecting member 53 includes an engaging pin 54 protruding from the control shaft 48 and a bush 55 that is externally inserted into the engaging pin 54 and slidably contacts both inner side surfaces of the slit groove 57. The slider gear 44 is provided with a positioning recess 69 or a jig insertion hole 71 as positioning means for temporarily positioning the bush 55 in the slit groove 57 when the connecting member 53 is attached to the control shaft 48.

  The variable valve mechanism 9 shown in FIGS. 1 to 4 of the first embodiment is a mechanism that continuously changes the opening / closing amount of the valve according to the operating state of the internal combustion engine. It is attached to the valve 8 for use. Specifically, there is one variable valve mechanism 9 for each cylinder 6, and each variable valve mechanism 9 is installed in the cylinder head 7 for each cylinder 6, and the intake valve described above. Two 8 are pressed simultaneously.

  The variable valve mechanism 9 includes a rotary cam 10 that is rotationally driven as the internal combustion engine 5 is operated, a rocker arm 15 that swings and opens and closes the valve 8 when power from the rotary cam 10 is transmitted, and the rotary cam. 10 and the rocker arm 15, and an intermediate drive mechanism 20 that adjusts the opening / closing amount of the valve 8 by adjusting the driving amount of the rocker arm 15 by the rotating cam 10.

  The rotating cam 10 is formed on a camshaft 10 x that is rotatably installed above the cylinder head 7, and includes a base circle portion 11 that is a basic portion and a cam nose 12 that protrudes from the base circle portion 11. Has been. A cam surface 10 s for pressing the mediating drive mechanism 20 is formed on the outer peripheral surface of the rotating cam 10.

  There are two rocker arms 15 for each variable valve mechanism 9, and one rocker arm 15 is installed for each valve 8. Each rocker arm 15 has a base end portion 15 a supported by the lash adjuster 17 so as to be swingable, and a tip end portion 15 b abutting against a stem end 8 e of the valve 8. A roller 16 that is pressed by the mediating drive mechanism 20 is pivotally attached to the intermediate portion of the rocker arm 15.

  The intermediary drive mechanism 20 includes an input unit 21 and an output unit 31 that are arranged on the same support pipe 20 x so as to be swingable. When the input unit 21 is driven by the rotary cam 10, the output unit 31 causes the valve 8. Is provided with a rotation phase difference variable mechanism 41 that fluctuates the relative rotation phase difference g between the input unit 21 and the output unit 31. In the following description, one of the length directions (axial direction) of the axis X that is the center line of the support pipe 20x is the front F, the other is the rear R, and the rotation direction (circumference) around the axis X is the axis. Direction), the direction in which the mediating drive mechanism 20 presses the rocker arm 15 to open the valve 8 is the opening direction O, and the opposite direction is the closing direction C.

  The support pipe 20x is a single pipe shared by a plurality of variable valve mechanisms 9, and is rotated around a plurality of standing wall portions 7v arranged in parallel at intervals in the front-rear directions F and R above the cylinder head 7. It is fixed immovable. Between the two standing wall portions 7v, the input portion 21 and the output portion 31 of one intermediary drive mechanism 20 are supported side by side with their end faces aligned. The input portion 21 and the output portion 31 are prevented from moving in the front-rear directions F and R by having both ends of the arrangement abutting against the standing wall portions 7v on both sides.

  The input part 21 is disposed at a substantially center between the standing wall parts 7v. The input portion 21 includes a cylindrical base circle portion 22 serving as a basic portion, an input arm 24 that supports an input roller 25 that contacts the rotating cam 10, and a return arm 27 to which a return spring 28 is attached. A shaft hole through which the support pipe 20x and the rotation phase difference variable mechanism 41 are inserted is formed at the center of the base circle portion 22. Two input arms 24 are formed so as to protrude in parallel to the outer peripheral surface of the base circle portion 22, and the above-described input roller 25 is axially attached via a shaft 26 between the tips of both input arms 24. Yes. Further, the return arm 27 is formed so as to protrude substantially opposite to the radial direction of the input portion 21 with respect to both the input arms 24, and the return arm 27 is moved in the opening direction C between the external spring mounting portion 29. The return spring 28 is attached so that the input roller 25 always abuts against the cam surface 10 s of the rotating cam 10 by urging.

  The output unit 31 is disposed one by one on both sides of the input unit 21 in the front-rear direction F, R. Each output portion 31 includes a cylindrical base circle portion 32 serving as a basic portion and an output nose 34 provided with an output cam surface 34 s for pressing the rocker arm 15. Is formed with a shaft hole through which the support pipe 20x and the rotation phase difference variable mechanism 41 are inserted. Further, a bearing portion 33 having a center hole for inserting the support pipe 20x is provided on the end surface opposite to the input portion side of both output portions 31. The output nose 34 of each output portion 31 is formed so as to protrude from the outer peripheral surface of the base circle portion 32, and the above-described output cam curved in a concave shape is formed on the outer peripheral surface of the output nose 34 in the opening direction O side from the top. A surface 34s is formed.

  The rotation phase difference varying mechanism 41 includes a slider gear 44 that engages helical splines having different angles with each other between the input unit 21 and the output unit 31, and a control shaft that slides on the axis X in the front-rear directions F and R. 48 and a connecting mechanism 52 that connects the slider gear 44 to the control shaft 48 so as not to be relatively movable in the front-rear directions F and R and to be relatively movable in the opening and closing directions O and C.

  The slider gear 44 is inserted between the support pipe 20 x and the input unit 21 and the output unit 31, and the input unit helical formed on the inner peripheral surface of the input unit 21 is formed on the outer peripheral surface of the slider gear 44. An input helical spline 45 that meshes with the spline 42 and an output helical spline 46 that meshes with the output helical spline 43 formed on the inner peripheral surface of the output unit 31 are provided. The details of these helical splines are such that the input helical spline 45 and the input portion helical spline 42 meshing with the helical spline 45 rotate in the closing direction C from the front F toward the rear R (in the figure, a right-handed spiral). The output helical spline 46 and the output portion helical spline 43 that mesh with the output helical spline 46 are formed in a spiral shape (left-handed spiral shape in the drawing) that turns in the opening direction O as it advances from the front F to the rear R. . The shape of the slider gear 44 is substantially cylindrical, the inner peripheral surface is in sliding contact with the support pipe 20x, and the input helical spline 45 and the output helical spline 46 are arranged in the front-rear direction F, on the outer peripheral surface. Formed at an interval to R. And between these both helical splines 45 and 46, the small diameter part 47 whose diameter became small compared with the other part is formed.

  Like the support pipe 20x, the control shaft 48 is a single shaft shared by the plurality of variable valve mechanisms 9 and is inserted into the support pipe 20x. One end of the control shaft 48 is connected to a variable lift amount actuator (not shown) that drives the control shaft 48 in the front-rear directions F and R.

  The coupling mechanism 52 includes a bottomed slit groove 57 provided in the slider gear 44 extending in the opening and closing directions O and C, a long hole 59 provided in the support pipe 20 x extending in the front and rear directions F and R, and a control shaft 48. And a connecting member 53 that projects through the long hole 59 and engages with the slit groove 57. Further, around the connection mechanism 52, connection member attachment means 63 that allows the connection member 53 to be attached to the control shaft 48 is formed.

  The slit groove 57 is recessed on the inner peripheral side of the portion where the input helical spline 45 is formed on the inner peripheral surface of the slider gear 44. Specifically, the slit groove 57 is provided in a loop shape over the entire circumference of the inner peripheral surface, and a pair of engagement surfaces formed on both inner side surfaces of the slit groove 57 are connected to the connecting member 53. It is restrained in the front-rear directions F and R and is slidably engaged in the opening and closing directions O and C.

  The connecting member 53 is attached to the control shaft 48 at the base end side, and the engagement pin 54 protruding from the control shaft 48 at the distal end side, and is inserted on the distal end of the engagement pin 54 and slides on the inner surface of the slit groove 57. And a bush 55 in contact therewith.

  One engagement pin 54 exists for each intermediary drive mechanism 20, and each engagement pin 54 passes through the long hole 59 and has a tip inserted into the slit groove 57 of the slider gear 44.

  The bush 55 is inserted so as to be rotatable with respect to the tip of the engagement pin 54. The sliding contact surfaces 55a and 55b with respect to both inner surfaces of the slit groove 57 of the bush 55 are subjected to crowning. The bush 55 is provided with a locking claw 56 that prevents the engagement pin 54 from penetrating from the bush 55. The locking claw 56 is formed to protrude toward the inside of the hole at the end of the inner peripheral surface of the shaft hole 55x into which the locking pin 54 is inserted.

  The connecting member attaching means 63 includes a pin attaching hole 64 to which the engaging pin 54 is attached, a pin insertion passage 65 that allows the engaging pin 54 to be inserted into the intermediate drive mechanism 20, and the connecting member 53 on the control shaft 48. A positioning recess 69 for temporarily positioning the bush 55 in the slit groove 57 when attached.

  The pin mounting hole 64 penetrates the control shaft 48 in the radial direction. The pin insertion passage 65 includes a pin insertion hole 68 penetrating the input portion 21, a pin insertion hole 67 penetrating the slider gear 44, and a pin insertion hole 66 penetrating the support pipe 20x. It is composed. Specifically, the pin insertion hole 67 of the slider gear 44 communicates from the outer peripheral surface of the slider gear 44 to the inner bottom surface of the slit groove 57. The pin insertion hole 66 of the support pipe 20x is formed on one end of the long hole 59 and on the opposite side in the radial direction of the support pipe 20x with respect to the inside thereof.

  The positioning recess 69 is a recess as positioning means for temporarily fitting the bush 55, and is provided on the inner bottom surface of the slit groove 57 in the slider gear 44. Specifically, the positioning recess 69 is formed on the opposite side of the slider gear 44 in the radial direction with respect to the portion where the pin insertion hole 67 is provided.

The state of assembling the mediation drive mechanism 20 shown above is shown in the following procedures (1) to (5).
(1) First, the bush 55 is fitted into the positioning recess 69 of the slit groove 57.
(2) Next, the input unit 21 and the output unit 31 are extrapolated to the slider gear 44, and the support pipe 20 x and the control shaft 48 are inserted into the standing wall portion 7 v and are inserted into the slider gear 44.
(3) Next, the control shaft 48, the support pipe 20x, the slider gear 44, and the input unit so that the pin mounting hole 64 and the pin insertion holes 66, 67, 68 formed in each member are aligned. Adjust the position of 21.
(4) Next, as shown in FIGS. 4 (a) and 4 (b), by arranging the pin insertion holes 66, 67, 68 on a straight line, the input portion 21, slider can be seen from the outer peripheral surface of the input portion 21. The engaging pin 54 is inserted into the pin mounting hole 64 through the gear 44 and the support pipe 20x and inserted from the pin insertion passage 65 communicating with the inner peripheral surface of the support pipe 20x. The bush 55 is extrapolated to the tip of the engagement pin 54 that passes through the pin mounting hole 64 and protrudes to the opposite side.
(5) Finally, as shown in FIGS. 4C and 4D, after the bush 55 is removed from the positioning recess 69, the control shaft 48 and the support pipe 20x are integrated with the slider gear 44. By rotating in the opening and closing directions O and C, the bush 55 is moved to a position where the positioning recess 69 does not move even during actual operation, and the support pipe 20x is pinned in the front and rear directions F and R with respect to the control shaft 48. By moving the insertion hole 66 by one, the pin insertion hole 66 is moved to a position where the engagement pin 54 does not slide even during actual operation, and then the support pipe 20x is fixed to the upright wall portion 7v so as not to be relatively movable. The control shaft 48 is connected to a lift amount actuator (not shown) so as not to be relatively movable.

  According to the first embodiment, since the positioning recess 69 is provided on the inner bottom surface of the slit groove 57, the bush 55 can be easily inserted into the pin insertion hole simply by fitting the bush 55 into the positioning recess 69. The slider gear 44 can be positioned on the opposite side to the radial direction of the slider gear 44. Therefore, after the positioning, simply by inserting the engaging pin 54 from the pin insertion hole 67 into the pin mounting hole 64, the bush 55 is passed through the pin mounting hole 64 and protrudes to the opposite side. Can be extrapolated. Therefore, the mounting work of the bush 55 is easy.

  The variable valve mechanism shown in FIG. 5 of the second embodiment is substantially the same as that of the first embodiment, but the connecting member mounting means 63 is slightly different from that of the first embodiment. This is different in that a jig insertion passage 70 is formed as a positioning means instead of.

  The jig insertion passage 70 is a passage through which the jig I for locking the bush 55 is inserted, and is provided so as to communicate from the outer peripheral surface of the input portion 21 to the slit groove 57 when the coupling mechanism 52 is assembled. Yes. The jig insertion passage 70 penetrates the input portion 21, penetrates the jig insertion hole 72 communicating from the outer peripheral surface to the inner peripheral surface of the input portion 21, and the slider gear 44. And a jig insertion hole 71 communicating from the outer peripheral surface to the inner bottom surface of the slit groove 57. The jig insertion hole 71 of the slider gear 44 is formed on the opposite side of the slider gear 44 in the radial direction with respect to the portion where the pin insertion hole 67 is provided. The jig insertion hole 71 has a diameter of about 2.5 mm.

A state of assembling the intermediary drive mechanism 20 of the second embodiment described above is shown in the following procedures (1) to (8).
(1) First, the bush 55 is fitted into the slit groove 57.
(2) Next, the input unit 21 and the output unit 31 are extrapolated to the slider gear 44.
(3) Next, the relative positions of the slider gear 44 and the input unit 21 are adjusted so that the jig insertion hole 72 of the input unit 21 and the jig insertion hole 71 of the slider gear 44 are aligned.
(4) Next, the jig I is inserted from the jig insertion passage 70 communicating from the outer peripheral surface of the input portion 21 to the inner bottom surface of the slit groove 57 by arranging the jig insertion holes 71 and 72 in a straight line. By inserting the tip of the jig I between the engaging claws 56 of the bush 55 located on the inner bottom surface side of the slit groove 57, the bush 55 is locked and positioned in the slit groove 57.
(5) Next, the support pipe 20 x and the control shaft 48 are inserted into the standing wall portion 7 v of the cylinder head 7 and inserted into the slider gear 44.
(6) Next, the control shaft 48, the support pipe 20x, the slider gear 44, and the input unit are arranged so that the pin mounting hole 64 and the pin insertion holes 66, 67, 68 formed in each member are aligned. Adjust each position of 21.
(7) Next, as shown in FIGS. 5 (a) and 5 (b), the pin insertion holes 66, 67, 68 are arranged in a straight line so that the inner peripheral surface of the support pipe 20x extends from the outer peripheral surface of the input portion 21. The engagement pin 54 is inserted into the pin insertion passage 65 that communicates with the pin attachment hole 65, and the engagement pin 54 is attached to the pin attachment hole 64. The bush 55 is extrapolated to the tip. At the same time as the extrapolation, the jig I is extracted from between the engaging claws 56.
(8) Finally, as shown in FIGS. 5 (c) and 5 (d), after the jig I is pulled out of the intermediate drive mechanism 20, the support pipe 20 x is moved in the front-rear direction F, R with respect to the control shaft 48. By moving the pin insertion hole 66 by one pin, the pin insertion hole 66 is moved to a position where the engagement pin 54 does not slide even during actual operation, so that the support pipe 20x cannot be moved relative to the standing wall 7v. The control shaft 48 is fixedly connected to a lift amount actuator (not shown) so as not to be relatively movable.

  According to the second embodiment, since the jig insertion hole 71 is provided in the slider gear 44, the jig I is inserted from the jig insertion hole 71 and the bush 55 is locked by the jig I. Thus, as in the first embodiment, the bush 55 can be easily positioned on the opposite side in the radial direction of the slider gear 44 with respect to the pin insertion hole 67. Therefore, the mounting operation of the bush 55 becomes easy as in the first embodiment. Further, since the size of the jig insertion hole 71 is as small as about 2.5 mm in diameter, there is no fear of affecting the strength of the slider gear 44.

  In addition, this invention is not limited to the structure of the said Example, It can also change and embody in the range which does not deviate from the meaning of invention.

It is a whole side view which shows the variable valve mechanism of Example 1 of this invention. It is a perspective view which shows the mediation drive mechanism of the Example, and its periphery. It is a disassembled perspective view which shows the mode at the time of the assembly of the mediation drive mechanism of the Example. (A) (c) which shows the mode at the time of the assembly of the mediation drive mechanism of the Example is front sectional drawing, (b) (d) is side sectional drawing. (A) (c) which shows the mode at the time of the assembly of the mediation drive mechanism of Example 2 is front sectional drawing, (b) (d) is side sectional drawing. (A) is a top sectional view, (b) is a side sectional view, (c) is a side sectional view showing a mediation drive mechanism and its periphery of Conventional Example 2, ) Is a side sectional view showing a state of the assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Internal combustion engine 8 Valve 9 Variable valve mechanism 10 Rotating cam 20 Mediating drive mechanism 21 Input part 31 Output part 41 Rotation phase difference variable mechanism 44 Slider gear 48 Control shaft 52 Connection mechanism 53 Connection member 54 Engagement pin 55 Bush 57 Slit Groove 67 pin insertion hole 69 positioning recess (positioning means)
71 Jig insertion hole (positioning means)
I Jig X Axis F Front (Axial direction)
R rear (axial direction)
O Open direction (circumferential direction)
C Closing direction (circumferential direction)

Claims (4)

An input section (21) and an output section (31) supported on the same axis (X) so as to be swingable are provided. When the input section (21) is driven by a rotating cam (10), the output is performed. The intermediate drive mechanism (20) that drives the valve (8) by the section (31), and the rotational position that varies the relative rotational phase difference (g) between the input section (21) and the output section (31). In the variable valve mechanism (9) of the internal combustion engine provided with the phase difference variable mechanism (41),
The rotation phase difference variable mechanism (41) includes a substantially cylindrical slider gear (44) that engages helical splines having different angles with each other between the input unit (21) and the output unit (31). The control shaft (48) sliding in the axial direction on the axis (X) and the slit groove (57) having a bottom and extending in the circumferential direction formed in the inner peripheral surface of the slider gear (44). The side surface is restrained by the connecting member (53) attached to the control shaft (48) in the axis (X) direction (F, R) and slidable in the circumferential direction (O, C). consists includes engaging comprising connecting mechanism (52), said connecting member (53), the control shaft (48) mounted in the pin mounting hole penetrating in the radial direction (64) said control shaft An engaging pin (54) projecting from 48) is constituted and a bush (55) which is in sliding contact with both inner side surfaces of the extrapolated by the slit groove (57) in engagement pin (54),
The slider gear (44) has a pin insertion hole (67) into which the engagement pin (54) is inserted during assembly in communication from the outer peripheral surface of the slider gear (44) to the inner bottom surface of the slit groove (57). If, when installing the connecting member (53) to said control shaft (48), and positioning means for the temporary positioning bushing (55) in said slit groove (57) in is provided,
The positioning means is recessed on the inner bottom surface of the slit groove (57) opposite to the radial direction of the slider gear (44) with respect to the portion of the slider gear (44) where the pin insertion hole (67) is provided. A variable valve mechanism for an internal combustion engine , comprising a recess (69) into which the bush (55) is fitted . An input section (21) and an output section (31) supported on the same axis (X) so as to be swingable are provided. When the input section (21) is driven by a rotating cam (10), the output is performed. The intermediate drive mechanism (20) that drives the valve (8) by the section (31), and the rotational position that varies the relative rotational phase difference (g) between the input section (21) and the output section (31). In the variable valve mechanism (9) of the internal combustion engine provided with the phase difference variable mechanism (41),
The rotation phase difference variable mechanism (41) includes a substantially cylindrical slider gear (44) that engages helical splines having different angles with each other between the input unit (21) and the output unit (31). The control shaft (48) sliding in the axial direction on the axis (X) and the slit groove (57) having a bottom and extending in the circumferential direction formed in the inner peripheral surface of the slider gear (44). The side surface is restrained by the connecting member (53) attached to the control shaft (48) in the axis (X) direction (F, R) and slidable in the circumferential direction (O, C). A coupling mechanism (52) formed by engagement, and the coupling member (53) is mounted in a pin mounting hole (64) that penetrates the control shaft (48) in the radial direction. An engaging pin (54) projecting from 48) is constituted and a bush (55) which is in sliding contact with both inner side surfaces of the extrapolated by the slit groove (57) in engagement pin (54),
The slider gear (44) has a pin insertion hole (67) into which the engagement pin (54) is inserted during assembly in communication from the outer peripheral surface of the slider gear (44) to the inner bottom surface of the slit groove (57). And positioning means for temporarily positioning the bush (55) in the slit groove (57) when the connecting member (53) is attached to the control shaft (48),
The positioning means communicates with the slit groove (57) from the outer peripheral surface of the slider gear (44) opposite to the radial direction with respect to the portion of the slider gear (44) provided with the pin insertion hole (67). A variable valve mechanism comprising a jig insertion hole (71) for inserting a jig (I) for locking the bush (55) . An input section (21) and an output section (31) supported on the same axis (X) so as to be swingable are provided. When the input section (21) is driven by a rotating cam (10), the output is performed. The intermediate drive mechanism (20) that drives the valve (8) by the section (31), and the rotational position that varies the relative rotational phase difference (g) between the input section (21) and the output section (31). In the assembling method of the variable valve mechanism (9) of the internal combustion engine including the phase difference variable mechanism (41),
The rotating phase difference variable mechanism (41) is assembled by a substantially cylindrical slider gear (meshing helical splines having different angles from each other) between the input section (21) and the output section (31). 44) a bush (slidably engaged with both inner side surfaces of the slit groove (57) in a recess (69) recessed in the inner bottom surface of the slit groove (57) provided in the inner peripheral surface of 44). 55) is temporarily fitted, and the bush (55) is positioned on the opposite side of the slider gear (44) in the radial direction with respect to the pin insertion hole (67) penetrating the slider gear (44), A control shaft (48) that slides in the axial direction (F, R) on the axis (X) is inserted into the cylindrical hole of the slider gear (44), and then penetrated through the slider gear (44). Pin insertion hole (67) An engagement pin (54) is inserted into the cylindrical hole, and the engagement pin (54) is attached to a pin attachment hole (64) that penetrates the control shaft (48) in the radial direction and the pin attachment hole (64). A method of assembling the variable valve mechanism (9) of an internal combustion engine, wherein the bush (55) is extrapolated to the tip of the engaging pin 54 that protrudes through the opposite side. An input section (21) and an output section (31) supported on the same axis (X) so as to be swingable are provided. When the input section (21) is driven by a rotating cam (10), the output is performed. The intermediate drive mechanism (20) that drives the valve (8) by the section (31), and the rotational position that varies the relative rotational phase difference (g) between the input section (21) and the output section (31). In the assembling method of the variable valve mechanism (9) of the internal combustion engine including the phase difference variable mechanism (41),
The rotating phase difference variable mechanism (41) is assembled by a substantially cylindrical slider gear (meshing helical splines having different angles from each other) between the input section (21) and the output section (31). 44) A bush (55) that is slidably engaged with both inner surfaces of the slit groove (57) is fitted into the slit groove (57) that is recessed in the inner peripheral surface of the slider gear (44). The jig (I) is inserted from the through hole (71), the bush (55) is temporarily locked by the jig (I), and the bush (55) is then moved to the slider gear (44). ) Is positioned on the opposite side of the radial direction of the slider gear (44) with respect to the pin insertion hole (67) penetrating into the pin insertion hole (67), and the axial line (X) is placed in the cylindrical hole of the slider gear (44) in the axial direction ( Control shaft (4) sliding to F, R) ) Is inserted into the cylinder hole from the pin insertion hole (67) penetrating the slider gear (44), and the engagement pin (54) is inserted into the control shaft. (48) is attached to the pin mounting hole (64) penetrating in the radial direction, and the bush (55) is extrapolated to the tip of the engaging pin (54) protruding through the pin mounting hole (64) to the opposite side. A method for assembling the variable valve mechanism (9) for an internal combustion engine.

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