JP5928835B2 - Valve lift adjustment device - Google Patents

Description

  The present invention relates to a valve lift adjusting device.

  2. Description of the Related Art A valve lift adjusting device that switches a cam that is linked to an intake / exhaust valve by moving a plurality of cams fitted to an engine camshaft in the axial direction is known. The valve lift adjusting device disclosed in Patent Document 1 performs cam switching by a slider and an actuator. The slider is a cylindrical body fitted to the camshaft, and has an engaging groove that extends in a spiral shape in the circumferential direction. The two cams are movable in the axial direction integrally with the slider. The actuator has an output pin that can be inserted into and removed from the engaging groove of the slider. The output pin restricts the axial position of the slider by being inserted into the engaging groove when the slider is rotating, and moves the slider in the axial direction.

US Patent Application Publication No. 2011/0247577

  In the valve lift adjusting device disclosed in Patent Literature 1, when the actuator output pin is inserted into the engagement groove of the slider, it collides with the bottom surface of the engagement groove and rebounds. Due to this rebound, the output pin may come out of the engagement groove. Further, even if the output pin does not come out of the engagement groove, the catch between the output pin and the side wall of the engagement groove is reduced, and the wear amount of the output pin and the side wall of the engagement groove may be increased.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a valve lift adjusting device that can reduce the amount of rebound of the output pin when the output pin is inserted into the engagement groove of the slider. That is.

  According to the present invention, when the cam shaft of the engine is rotating, the output pin of the actuator is inserted into the engagement groove of the slider, and the slider is moved in the axial direction together with the plurality of cams, thereby at least one of the intake valve and the exhaust valve. Is a valve lift adjusting device that adjusts the lift amount, and is characterized in that an elastic member is provided between the output pin and the slider. The elastic member prevents collision between the output pin and the bottom surface of the engagement groove when the output pin of the actuator is inserted into the engagement groove. “Preventing a collision” means preventing direct hitting.

According to the present invention, when the output pin of the actuator is inserted into the engagement groove, a part of the kinetic energy of the output pin is sandwiched between the output pin and the bottom surface of the engagement groove and elastically deformed. It is converted into thermal energy by friction. Therefore, compared with the conventional form in which an elastic member is not provided, the kinetic energy of the output pin immediately after a collision becomes small, and the amount of rebound of the output pin can be reduced.
In the first aspect of the present invention, the elastic member is fixed to the output pin. The output pin has a radial hole extending in the radial direction of the output pin, and a through hole extending from the distal end surface of the output pin to the radial hole. The elastic member includes a contact portion that is in close contact with the distal end surface of the output pin, a locking portion that extends along the radial hole, and a connection portion that extends from the contact portion to the locking portion through the through hole. Have.
In the second aspect of the present invention, the elastic member is positioned radially inward with respect to the side surface of the output pin when viewed from the axial direction of the output pin.
In the third aspect of the present invention, the bottom surface of the engagement groove is an uneven surface. The elastic member is fixed to the bottom surface of the engaging groove and is in close contact with the bottom surface.
In the 4th aspect of this invention, the coating which reduces the sliding resistance with another member is given to the surface of the elastic member.

It is a figure when it starts to shift from a small lift state to a large lift state in the valve lift adjusting apparatus according to the first embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is a figure in the middle of shifting from a small lift state to a large lift state in the valve lift adjustment device by a 1st embodiment of the present invention. It is the IV-IV sectional view taken on the line of FIG. It is a figure when it starts to shift from a large lift state to a small lift state in the valve lift adjusting device according to the first embodiment of the present invention. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a figure which expands and shows a part of actuator and slider of FIG. It is a figure which expands and shows the front-end | tip part of the output pin of the actuator of FIG. It is the IX-IX sectional view taken on the line of FIG. It is the figure seen from the arrow X direction of FIG. It is a figure which shows the front-end | tip part of the output pin of the actuator with which the valve timing adjustment apparatus by 2nd Embodiment of this invention is provided. It is the figure seen from the arrow XII direction of FIG. It is a figure which shows the front-end | tip part of the output pin of the actuator with which the valve timing adjustment apparatus by 3rd Embodiment of this invention is provided. It is a figure which shows the front-end | tip part of the output pin of the actuator with which the valve timing adjustment apparatus by 4th Embodiment of this invention is provided. It is a figure which shows the output pin of an actuator with which the valve timing adjustment apparatus by 5th Embodiment of this invention is provided, and a part of slider. It is a figure which shows the output pin of an actuator with which the valve timing adjustment apparatus by 6th Embodiment of this invention is provided, and a part of slider. It is a figure which shows the output pin of an actuator with which the valve timing adjustment apparatus by 7th Embodiment of this invention is provided, and a part of slider.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the embodiments, substantially the same components are denoted by the same reference numerals and description thereof is omitted.
(First embodiment)
The valve lift adjusting device according to the first embodiment of the present invention is a device that adjusts the lift amount of an intake valve of an engine.

First, the valve lift adjusting device will be described with reference to FIGS. In the following description, “FIG. 1 etc.” refers to FIGS. 1, 3 and 5, and “FIG. 2 etc.” refers to FIGS. 2, 4 and 6.
As shown in FIGS. 1 to 6, the valve lift adjusting device 10 includes an intake valve 91, 92 linked by a cylindrical member 20 that rotates together with the camshaft 11 via rollers 31, 32 and swing arms 33, 34. Adjust the lift amount.

The camshaft 11 rotates in a fixed direction in conjunction with a crankshaft (not shown). This rotational direction corresponds to the counterclockwise direction when the camshaft 11 is viewed from the left side in FIG.
As shown in FIG. 2 and the like, the camshaft 11 has spline external teeth formed on the outer surface of the portion where the cylindrical member 20 is fitted. In addition, illustration of a spline external tooth is abbreviate | omitted in FIG.
The cylindrical member 20 is provided so as to be movable relative to the camshaft 11 in the axial direction while rotating together with the camshaft 11 by engaging the spline inner teeth formed on the inner surface with the spline outer teeth of the camshaft 11. That is, the cylindrical member 20 is provided so as to be reciprocally movable in the axial direction between the two flange-shaped slider limiters 12 and 22 fixed to the camshaft 11.

Two sets of sliders 13 and 23, small lift cams 18 and 28, and large lift cams 19 and 29 are integrally provided at both ends of the cylindrical member 20. The sliders 13 and 23 switch the position of the cylindrical member 20 in the axial direction with respect to the camshaft 11.
Hereinafter, the left slider in FIG. 1 is referred to as a first slider 13, and the right slider in FIG. 1 is referred to as a second slider 23. Since these two sets are basically the same, the configuration of the first slider 13, the first small lift cam 18, and the first large lift cam 19 will be described as a representative.

The first slider 13 is formed with a first engagement groove 14 including a front step portion 15, a transition portion 16, and a rear step portion 17.
The front stage part 15 and the rear stage part 17 extend in directions orthogonal to the axis at different positions in the axial direction. As shown in FIG. 2, the depth of the groove | channel becomes shallow as the front step part 15 goes to the rotation direction front. As shown in FIG. 6, the depth of the groove | channel becomes shallow as the back | latter stage part 17 goes to a rotation direction back.
The transition part 16 connects the front stage part 15 and the rear stage part 17 while tilting so that the front in the rotational direction approaches the front stage part 15 and the rear in the rotational direction approaches the rear stage part 17 with respect to the direction orthogonal to the axis. ing.

Here, two electromagnetic actuators 41 and 42 corresponding to the first slider 13 and the second slider 23 are applied to the valve lift adjusting device 10.
The actuator 41 corresponding to the first slider 13 advances the output pin 61 in synchronization with the rotation timing of the camshaft 11 and engages the first engagement groove 14. As a result, the cylindrical member 20 moves to the slider limiter 12 side as the camshaft 11 rotates. On the other hand, the actuator 42 corresponding to the second slider 23 advances the output pin 62 in synchronization with the rotation timing of the camshaft 11 and engages with the second engagement groove 24. As a result, the cylindrical member 20 moves to the slider limiter 22 side as the camshaft 11 rotates. This detailed operation will be described later.

  The first small lift cam 18 and the first large lift cam 19 are provided adjacent to each other near the center of the cylindrical member 20 in the axial direction with respect to the first slider 13. As shown in FIG. 2 and the like, the first small lift cam 18 and the first large lift cam 19 are eccentric to the outside with respect to the reference circle in one direction of rotation. Further, the first large lift cam 19 is formed so that the amount of eccentricity from the reference circle is larger than that of the first small lift cam 18.

  With respect to the first slider 13 described above, the second slider 23 is arranged symmetrically in FIG. The second small lift cam 28 and the second large lift cam 29 are provided adjacent to each other near the center of the cylindrical member 20 in the axial direction with respect to the second slider 23. The second small lift cam 28 and the second large lift cam 29 are offset in the same direction in the axial direction with respect to the first small lift cam 18 and the first large lift cam 19 and are eccentric in the rotational direction. The portions are arranged in a direction shifted by about 180 °.

The rollers 31 and 32 and the swing arms 33 and 34 correspond to the two sets of small lift cams 18 and 28 and the large lift cams 19 and 29, respectively. The rotational movement of the camshaft 11 is reciprocated by the intake valves 91 and 92. Convert to
The rollers 31 and 32 are interposed between the small lift cams 18 and 28 and the large lift cams 19 and 29 and the central portions of the swing arms 33 and 34.

  The swing arms 33 and 34 have one end abutting against the lash adjusters 35 and 36 and the other end abutting against the intake valves 91 and 92. The swing arms 33, 34 swing with the contact portions with the lash adjusters 35, 36 as fulcrums so that the other ends of the arms approach or separate from the intake valves 91, 92. The lash adjuster 35 corresponding to the swing arm 33 is shown in FIG. 2 and the like, and the lash adjuster 36 corresponding to the swing arm 34 is not shown.

Next, the operation of the valve lift adjusting device 10 will be described with reference to FIGS.
As shown in FIGS. 1 and 2, when the cylindrical member 20 is on the slider limiter 22 side, the roller 31 contacts the outer peripheral surface of the eccentric portion of the small lift cam 18 and pushes down the swing arm 33. As a result, the intake valve 91 of the cylinder head 90 is opened by a relatively small lift amount L1. Further, the roller 32 abuts on the outer peripheral surface of the eccentric portion of the small lift cam 28 at a phase shifted by about 180 ° from the roller 31 and pushes down the swing arm 34. As a result, the intake valve 92 is opened by the lift amount L1.
Hereinafter, this state of the valve lift adjusting device 10 is referred to as a “small lift state”. In contrast, a state in which the roller 31 is in contact with the outer peripheral surface of the eccentric portion of the large lift cam 19 is referred to as a “large lift state”.

In the small lift state, the output pin 61 of the actuator 41 is located immediately above the front stage portion 15 of the first engagement groove 14. Therefore, when shifting from the small lift state to the large lift state, the actuator 41 advances the output pin 61 at the timing when the rotational position of the camshaft 11 has reached the position shown in FIGS. 14 is engaged.
When the cylindrical member 20 rotates together with the camshaft 11 in a state where the output pin 61 is fitted in the first engagement groove 14, the position of the groove in which the output pin 61 is fitted moves from the front stage portion 15 through the transition portion 16 to the rear stage portion 17. The cylindrical member 20 moves to the slider limiter 12 side as indicated by an arrow A1 in FIG.

The position P1 of the cams 18 and 19 when the cylindrical member 20 is rotated 90 ° from the position P0 shown in FIGS. 1 and 2 is indicated by solid lines in FIGS. Further, the positions P2 and P3 of the cams 18 and 19 when the cylindrical member 20 is rotated 180 ° and 270 ° from the position P0 are indicated by two-dot chain lines in FIG. In the rotation range from the position P1 to the position P3, since the roller 31 is in contact with the outer peripheral surface of the reference circular portion of the cams 18 and 19, the intake valves 91 and 92 are kept closed.
Further, at the rotational position past the position P3, the depth of the groove of the rear stage portion 17 becomes shallow, and the bottom surface of the rear stage portion 17 pushes back the output pin 61 of the actuator 41.

  Thereafter, as shown in FIGS. 5 and 6, at the position P <b> 4 where the cylindrical member 20 is rotated 360 ° from the position P <b> 0, the roller 31 comes into contact with the outer peripheral surface of the eccentric portion of the large lift cam 19, and the swing arm 33 is moved. Press down. That is, the valve lift adjusting device 10 is in a large lift state. As a result, the intake valve 91 of the cylinder head 90 is opened by a relatively large lift amount L2. Further, the roller 32 abuts on the outer peripheral surface of the eccentric portion of the large lift cam 29 at a phase shifted by about 180 ° from the roller 31 and pushes down the swing arm 34. As a result, the intake valve 92 is opened by the lift amount L2.

In the large lift state, the output pin 62 of the actuator 42 is located immediately above the front stage portion 25 of the second engagement groove 24. Therefore, when shifting from the large lift state to the small lift state, the actuator 42 advances the output pin 62 at the timing when the rotational position of the camshaft 11 has reached the position shown in FIGS. 24 is engaged.
When the cylindrical member 20 rotates together with the camshaft 11 in a state where the output pin 62 is fitted in the second engagement groove 24, the position of the groove in which the output pin 62 is fitted moves from the front step portion 25 through the transition portion 26 to the rear step portion 27. The cylindrical member 20 moves to the slider limiter 22 side as indicated by an arrow A2 in FIG.

As described above, the valve lift adjusting device 10 controls the operation of the actuators 41 and 42 in synchronization with the rotation timing of the camshaft 11, thereby the lift amounts of the intake valves 91 and 92 are set to the lift amount L1 and the lift amount L2. You can switch to either.
Specifically, the operating conditions can be appropriately improved by adjusting the valve lift amount according to the engine speed and load.

  Next, the detailed structure of the output pin of the actuator which is the principal part of this invention is demonstrated with reference to FIGS. Since the configuration of the output pin 61 of the actuator 41 and the output pin 62 of the actuator 42 are basically the same, the configuration of the output pin 61 will be described as a representative.

  As shown in FIGS. 7 and 8, an elastic member 70 is provided at the tip of the output pin 61. The elastic member 70 is fixed to the output pin 61 and can move in the direction of approaching and separating from the first slider 13 together with the output pin 61. The elastic member 70 is located between the output pin 61 and the first slider 13 and prevents the output pin 61 and the bottom surface 21 of the first engagement groove 14 from directly colliding with each other. In the present embodiment, the elastic member 70 is made of rubber. The above “rubber” is classified as a thermosetting elastomer among elastomers, and is vulcanized rubber such as natural rubber or synthetic rubber, or thermosetting resin such as urethane rubber, silicone rubber, or fluoro rubber. System elastomers are included. When the output pin 61 is inserted into the first engagement groove 14 of the first slider 13, a part of the kinetic energy of the output pin 61 is sandwiched between the output pin 61 and the bottom surface 21 of the first engagement groove 14. It is converted into thermal energy by the internal friction of the elastic member 70 that is elastically deformed.

  As shown in FIGS. 8 to 10, the output pin 61 is a cylindrical member having a circular cross section, and the tip surface 63 of the output pin 61 is a plane orthogonal to the axis 64 of the output pin 61. The output pin 61 has two radial holes 65 and 66 penetrating in the radial direction, and a through hole 67 extending from the distal end surface 63 to the radial holes 65 and 66. In the present embodiment, the through hole 67 is positioned coaxially with the axial center 64, and the radial hole 65 and the radial hole 66 intersect the through hole 67 on the axial center 64.

  The elastic member 70 extends along the contact portion 71 provided on the distal end surface 63 of the output pin 61, the locking portion 73 extending in a cross shape along the radial holes 65 and 66, and the through hole 67. A connecting portion 74 that connects the extending locking portion 73 and the contact portion 71 is provided. The elastic member 70 is molded by injecting a liquefied material into a mold in which the output pin 61 is set. The contact portion 71 is in close contact with the tip surface 63 of the output pin 61. The locking portion 73 is in close contact with the inner wall surfaces of the radial holes 65 and 66, and the connection portion 74 is in close contact with the inner wall surface of the through hole 67.

As shown in FIGS. 7 and 8, the facing surface 75, which is the surface facing the bottom surface 21 of the first engagement groove 14 of the first slider 13, of the contact portion 71 of the elastic member 70 is a convex curved surface. . An axial distance L3 from the tip of the contact portion 71 to the opening 69 of the radial holes 65 and 66 vacated on the side surface 68 of the output pin 61 is greater than the depth L4 of the first engagement groove 14.
As shown in FIGS. 9 and 10, the elastic member 70 is located radially inward with respect to the side surface 68 of the output pin 61 when viewed from the axial direction of the output pin 61. That is, the elastic member 70 does not protrude outward in the radial direction from the side surface 68 of the output pin 61.

(effect)
The effect of the valve lift adjusting device 10 of the first embodiment will be described.
(1) In the valve lift adjusting device 10 of the first embodiment, when the output pins 61 and 62 are inserted into the engaging grooves 14 and 24 of the sliders 13 and 23, a part of the kinetic energy of the output pins 61 and 62 is It is converted into thermal energy by the internal friction of the elastic member 70 that is sandwiched between the output pins 61 and 62 and the bottom surfaces 21 of the engaging grooves 14 and 24 and elastically deforms. Therefore, the kinetic energy of the output pins 61 and 62 immediately after the collision is reduced, and the amount of rebound of the output pins 61 and 62 is reduced.

(2) The elastic member 70 is fixed to the output pins 61 and 62. Therefore, for example, the elastic member 70 can be made smaller than the case where the elastic member 70 is fixed to the sliders 13 and 23. Further, when the elastic member 70 is consumed, it can be replaced relatively easily.
(3) The locking portion 73 of the elastic member 70 fixes the elastic member 70 by engaging with the inner walls of the radial holes 65 and 66 of the output pins 61 and 62. Therefore, it is possible to suppress the elastic member 70 from being detached from the output pins 61 and 62.

(4) The facing surface 75 of the contact portion 71 of the elastic member 70 is a convex curved surface. Therefore, even if the output pins 61 and 62 are slightly inclined, the central portion of the contact portion 71 of the elastic member 70 can be brought into contact with the bottom surface 21 of the engagement grooves 14 and 24. Thereby, the contact part 71 of the elastic member 70 becomes difficult to peel off from the front end surface 63 of the output pins 61 and 62.
On the other hand, when the opposing surface of the contact portion of the elastic member is a flat surface, when the output pin is inclined, the outer edge portion of the elastic member comes into contact with the bottom surface of the engagement groove. Thereby, the contact part of an elastic member becomes easy to peel from the front end surface of an output pin.

(5) The axial distance L3 from the tip of the contact portion 71 of the elastic member 70 to the opening 69 of the radial holes 65 and 66 vacated on the side surfaces 68 of the output pins 61 and 62 is the engagement grooves 14 and 24. Greater than the depth L4. Therefore, it is possible to prevent the wear of the side walls of the engagement grooves 14 and 24 from increasing due to the edges of the openings 69 of the radial holes 65 and 66 coming into contact with the side walls of the engagement grooves 14 and 24. it can.
(6) The elastic member 70 is positioned radially inward with respect to the side surface 68 when viewed from the axial direction of the output pins 61 and 62. Therefore, the elastic member 70 can be prevented from coming off the output pins 61 and 62 due to the elastic member 70 coming into contact with the side walls of the engagement grooves 14 and 24.

(Second Embodiment)
A valve lift adjusting device according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the output pin 101 has four through holes 102 so as to surround the through hole 67. The through hole 102 extends from the distal end surface 63 to the radial hole 65 or the radial hole 66 at a position corresponding to the outer edge portion of the contact portion 71 of the elastic member 103.

The elastic member 103 has four connection portions 104 extending from the contact portion 71 to the locking portion 73 through the through hole 102. The connection part 104 is connected to the outer edge part of the contact part 71.
According to the second embodiment, the same effect as that of the first embodiment can be obtained, and the elastic member 103 has four connection portions 104 connected to the outer edge portion of the contact portion 71. Therefore, it is possible to suppress the contact portion 71 from being peeled off from the tip surface 63 of the output pin 101.

(Third embodiment)
A valve lift adjusting device according to a third embodiment of the present invention will be described with reference to FIG. In 3rd Embodiment, the coating which reduces the frictional resistance with a slider is given to the opposing surface 113 of the contact part 112 of the elastic member 111. As shown in FIG. For example, a fluororesin coating is employed as the coating.
According to the third embodiment, the same effect as that of the first embodiment can be obtained, and furthermore, since the elastic member 111 has a lower friction than that which is not coated, the elastic member 111, the slider, An increase in the rotational load on the camshaft associated with the contact can be suppressed.

(Fourth embodiment)
A valve lift adjusting apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the elastic member 121 is made of rubber containing a fluororesin.
According to the fourth embodiment, the same effect as that of the first embodiment can be obtained, and furthermore, since the elastic member 121 has a lower friction than that made of only rubber, the elastic member 121, the slider, An increase in the rotational load on the camshaft associated with the contact can be suppressed.

(Fifth embodiment)
A valve lift adjusting apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the elastic member 131 is a belt-like member extending along the bottom surface 135 of the engagement groove 134 of the slider 133 and is in close contact with the bottom surface 135. Of the elastic member 131, the facing surface 132, which is the surface facing the tip surface 137 of the output pin 136, is a convex curved surface.

  According to the fifth embodiment, when the output pin 136 is inserted into the engagement groove 134 of the slider 133, a part of the kinetic energy of the output pin 136 is converted into heat energy by the internal friction of the elastic member 131 that is elastically deformed. The Therefore, the kinetic energy of the output pin 136 immediately after the collision is reduced, and the amount of rebound of the output pin 136 is reduced.

  According to the fifth embodiment, the facing surface 132 of the elastic member 131 is a convex curved surface. Therefore, even if the output pin 136 is slightly inclined, the central portion in the groove width direction of the elastic member 131 can be brought into contact with the output pin 136. This makes it difficult for the elastic member 131 to peel off from the bottom surface 135 of the engagement groove 134.

(Sixth embodiment)
A valve lift adjusting apparatus according to a sixth embodiment of the present invention will be described with reference to FIG. In the sixth embodiment, the bottom surface 143 of the engagement groove 142 of the slider 141 is an uneven surface having a plurality of holes 144. The elastic member 145 is in close contact with the bottom surface 143 of the engagement groove 142 without a gap.
According to the sixth embodiment, the same effect as that of the fifth embodiment can be obtained, and the contact area of the elastic member 145 can be increased. This makes it difficult for the elastic member 145 to peel off from the bottom surface 143 of the engagement groove 142.

(Seventh embodiment)
A valve lift adjusting apparatus according to a seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment, the elastic member 151 is a belt-like member provided on the bottom surface 135 of the engagement groove 134 of the slider 133, and the surface 152 facing the output pin 153 is a cylindrical surface. The front end surface 154 of the output pin 153 is a convex curved surface protruding toward the elastic member 151 side.
According to the seventh embodiment, the same effect as in the sixth embodiment can be obtained.

(Other embodiments)
In another embodiment of the present invention, the elastic member may be composed of only the contact portion.
In another embodiment of the present invention, the shape of the contact portion of the elastic member as viewed from the axial direction is not limited to a circle, and may be another shape such as an ellipse, a rectangle, or a polygon.
In another embodiment of the present invention, the connecting portion of the elastic member is not limited to a cylinder, and may be other shapes such as a quadrangular prism and a triangular prism. In short, any shape that can connect the contact portion and the locking portion may be used, and the cross-sectional shape may change in the axial direction.

In another embodiment of the present invention, the number of connecting portions of the elastic member may be 2 to 4, or 6 or more. Further, the connecting portion of the elastic member may not be on the axis of the output pin.
In another embodiment of the present invention, at least one engaging portion of the elastic member may extend from the connecting portion in the radial direction.
In other embodiment of this invention, the latching | locking part of an elastic member is not restricted to a cylinder, For example, other shapes, such as a square pole and a triangular prism, may be sufficient. In short, the shape may be any shape as long as the connecting portion protrudes radially outward from a certain through hole when viewed from the axial direction.
In another embodiment of the present invention, the elastic member is not limited to a thermosetting elastomer, and may be a thermoplastic elastomer.

In another embodiment of the present invention, the slider and each cam may be constituted by separate members. In short, it is sufficient that the slider is movable in the axial direction integrally with each cam.
In other embodiments of the present invention, each cam and slider may be coupled to the camshaft by methods other than spline fitting.
In other embodiments of the present invention, any difference in cam profiles between the cams may be provided.
In another embodiment of the present invention, three or more cams may be provided.

In another embodiment of the present invention, the valve lift adjustment device may adjust the lift amount of the exhaust valve.
In another embodiment of the present invention, the configuration of the cam portion, the slider, etc. of the valve lift adjustment device is not limited to that illustrated in the above embodiment, but may be any one that switches the axial position of the slider by the output pin of the actuator. Any configuration may be used.
The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 10 ... Valve lift adjustment apparatus 11 ... Cam shaft 13, 23 ... Slider 14, 24, 134, 142 ... Engaging groove 18, 19 ... Cam 21, 135, 143 ... Bottom 41, 42 ... Actuator 61, 62, 101, 136 ... Output pin 70, 103, 111, 121, 131, 145 ... Elastic member 91 ... Intake valve

Claims (9)

The lifts (L1, L2) of at least one of the intake valve (91) and the exhaust valve (92) are moved by moving a plurality of cams (18, 19) fitted to the camshaft (11) of the engine in the axial direction. ) To adjust the valve lift (10),
A slider (13) which is a cylindrical body fitted to the camshaft, has engaging grooves (14, 24) extending spirally on the radially outer wall, and is movable in the axial direction integrally with the cam. 23)
An output pin (61, 62, 101) that can be inserted into and removed from the engaging groove is provided, and when the slider is rotating, the output pin is inserted into the engaging groove to restrict the axial position of the slider. Actuators (41, 42) for moving the slider in the axial direction by:
An elastic member (70, provided between the output pin and the slider) that prevents the output pin and the bottom surface (21) of the engagement groove from colliding when the output pin is inserted into the engagement groove. 103, 111, 121),
Equipped with a,
The elastic member is fixed to the output pin;
The output pin includes a radial hole (65, 66) extending in a radial direction of the output pin, and a through hole (67, 102) extending from a distal end surface (63) of the output pin to the radial hole. )
The elastic member includes a contact portion (71, 112) that is in close contact with the tip surface of the output pin, a locking portion (73) that extends along the radial hole, and a contact portion. A valve lift adjusting device having connection portions (74, 104) extending to the locking portion through the through hole . Wherein among the contact portions of the elastic member, the surface facing the bottom surface of the engagement groove (75,113), the valve lift adjustment device according to claim 1, characterized in that the convex curved surface. Wherein the connecting portion of the elastic member (103) (104), the valve lift adjustment device according to claim 1 or 2, characterized in that connecting the outer edge portion of the contact portion (71). The axial distance (L3) from the tip of the contact portion of the elastic member to the opening (69) of the radial hole vacated on the side surface (68) of the output pin is the depth of the engagement groove. The valve lift adjusting device according to any one of claims 1 to 3 , wherein the valve lift adjusting device is larger than (L4). The valve lift according to any one of claims 1 to 4 , wherein the elastic member is positioned radially inward with respect to a side surface of the output pin when viewed from an axial direction of the output pin. Adjustment device. The lifts (L1, L2) of at least one of the intake valve (91) and the exhaust valve (92) are moved by moving a plurality of cams (18, 19) fitted to the camshaft (11) of the engine in the axial direction. ) To adjust the valve lift (10),
A slider (13) which is a cylindrical body fitted to the camshaft, has engaging grooves (14, 24) extending spirally on the radially outer wall, and is movable in the axial direction integrally with the cam. 23)
An output pin (61, 62, 101) that can be inserted into and removed from the engaging groove is provided, and when the slider is rotating, the output pin is inserted into the engaging groove to restrict the axial position of the slider. Actuators (41, 42) for moving the slider in the axial direction by:
An elastic member (70, provided between the output pin and the slider) that prevents the output pin and the bottom surface (21) of the engagement groove from colliding when the output pin is inserted into the engagement groove. 103, 111, 121),
Equipped with a,
The valve lift adjusting device according to claim 1, wherein the elastic member is positioned radially inward with respect to a side surface of the output pin when viewed from an axial direction of the output pin . The lifts (L1, L2) of at least one of the intake valve (91) and the exhaust valve (92) are moved by moving a plurality of cams (18, 19) fitted to the camshaft (11) of the engine in the axial direction. ) To adjust the valve lift (10),
A slider (141) which is a cylindrical body fitted to the camshaft, has an engaging groove (142) extending spirally on a radially outer wall, and is movable in the axial direction integrally with the cam; ,
The slider has an output pin (136) that can be inserted into and removed from the engaging groove, and when the slider is rotating, the output pin is inserted into the engaging groove to restrict the axial position of the slider. Actuators (41, 42) for moving the shaft in the axial direction;
An elastic member (145) that is provided between the output pin and the slider and prevents the output pin and the bottom surface (143) of the engagement groove from colliding when the output pin is inserted into the engagement groove. When,
Equipped with a,
The bottom surface of the engagement groove is an uneven surface,
The valve lift adjusting device , wherein the elastic member is fixed to the bottom surface of the engagement groove and is in close contact with the bottom surface . The valve lift according to any one of claims 1 to 7 , wherein the surface (113) of the elastic member (111) is coated with a coating that reduces sliding resistance with other members. Adjustment device. The lifts (L1, L2) of at least one of the intake valve (91) and the exhaust valve (92) are moved by moving a plurality of cams (18, 19) fitted to the camshaft (11) of the engine in the axial direction. ) To adjust the valve lift (10),
A slider (13) which is a cylindrical body fitted to the camshaft, has engaging grooves (14, 24) extending spirally on the radially outer wall, and is movable in the axial direction integrally with the cam. 23)
By having an output pin (61, 62) that can be inserted into and removed from the engaging groove, and when the slider is rotating, the output pin is inserted into the engaging groove to restrict the axial position of the slider, Actuators (41, 42) for moving the slider in the axial direction;
An elastic member (111) which is provided between the output pin and the slider and prevents the output pin and the bottom surface (21) of the engagement groove from colliding when the output pin is inserted into the engagement groove. When,
Equipped with a,
The valve lift adjusting device according to claim 1, wherein a coating for reducing sliding resistance with other members is applied to a surface (113) of the elastic member .

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