JP6851287B2 - Valve gear - Google Patents

Description

The present invention relates to a valve gear.

The valve gear of an internal combustion engine is a device that transmits the rotational power of a cam to a valve via a roller arm, and the roller arm swings as the cam rotates to reciprocate the valve. There is. The roller arm includes a roller that is rotatably supported, and when the roller is pressed by the cam, the roller arm swings with one end that comes into contact with the pivot as a fulcrum.

In this type of valve gear, oil (lubricating oil) is used to prevent seizure of the contact portion between the cam and the roller. For example, as shown in Patent Document 1, oil is injected into a hollow camshaft, and the oil is discharged to the outside through a hole provided in the peripheral surface (cam surface) of the cam of the camshaft. There is a method of lubricating the contact portion between the cam and the roller. In this method, since the oil is discharged from the hole of the rotating cam, the oil is scattered by the centrifugal force, and it is possible to lubricate not only the vicinity of the roller of the roller arm but also the portion away from the roller.

Japanese Unexamined Patent Publication No. 2011-179378

If a hole for discharging oil is provided on the peripheral surface of the cam, the hole will be closed by the surface of the roller at regular intervals. Therefore, every time the hole is closed by the roller, the oil discharge from the hole is stopped, and the oil cannot be evenly scattered from the cam side to the surroundings. Moreover, since the rotation direction of the cam is constant, the oil cannot be ejected only in a specific direction each time the hole is closed by a roller. In this way, if the peripheral surface of the cam is provided with a hole for discharging oil, there may be a place where oil cannot be directly supplied, which may cause a problem such as seizure in the valve gear, which is a problem. It was.

Further, when the viscosity of the oil is high at the time of starting the internal combustion engine or the like, the oil discharged from the hole of the cam tends to stick to the surface of the cam due to the surface tension of the oil and stay there. Further, when the internal combustion engine is in an idle state or the like and the oil pressure discharged from the hole is low, the oil tends to stay on the surface of the cam. As described above, if the oil stays on the surface of the cam, the oil is dropped downward by the roller each time the cam comes into contact with the roller, and it is difficult to supply the oil above the cam.

Even if there is a place where the oil cannot be directly supplied, the oil may hang down from the cam side due to its own weight and be indirectly supplied to such a place. However, when the axis of the cylinder is tilted from the vertical direction and the end of the roller arm is positioned higher than the cam (roller), for example, in a slant engine, such a high position causes oil. When it became a place where it could not be supplied directly, it was not possible to distribute the oil by its own weight, which was a particular problem.

An object of the present invention is to provide a valve gear capable of reliably supplying oil (lubricating oil) to at least a contact portion between a cam and a roller arm.

The valve gear according to the present invention has a tubular shape including a lubricating oil passage extending along the axial direction, and has a camshaft that rotates in conjunction with the rotation of the crankshaft and a camshaft that rotates outward from the outer peripheral surface of the camshaft. It has a cam that is fixed to the camshaft in a protruding form and rotates together with the camshaft, and a roller that is rotatably supported and contacts the cam, and the other end side swings with one end side as a fulcrum. A valve gear provided with a moving roller arm, which is provided so as to penetrate the wall of the camshaft arranged near the cam, and allows lubricating oil flowing through the lubricating oil passage to be supplied to the outside of the camshaft. The discharge hole portion to be discharged and the lubricating oil fixed to the camshaft so as to rotate together with the camshaft and discharged from the discharge hole portion are transmitted to at least the contact portion between the cam and the roller. At the same time, it is provided with a supply unit that supplies in a scattered form.

In the valve gear, one end of the supply portion may be inserted into the discharge hole portion and the other end may have a longitudinal shape toward the contact portion.

In the valve gear, the supply portion preferably comprises a thin tube that communicates with the lubricating oil passage through the discharge hole portion.

In the valve gear, the supply portion may be in the shape of a plate that extends outward from the outer peripheral surface of the camshaft so as to orbit the camshaft and the outer peripheral edge side faces the contact portion.

In the valve gear, the supply unit may scatter and supply the lubricating oil together with the contact portion toward the one end side and the other end side of the roller arm. preferable.

In the valve gear, the roller arm may be arranged so that one end side thereof is higher than the camshaft in the vertical direction.

According to the present invention, it is possible to provide a valve gear capable of reliably supplying oil (lubricating oil) to at least the contact portion between the cam and the roller arm.

Sectional drawing of valve gear (valve closed state) of internal combustion engine which concerns on Embodiment 1. Sectional drawing of valve gear (valve open state) of internal combustion engine which concerns on Embodiment 1. Explanatory drawing which shows how lubricating oil is supplied to the contact part between a cam and a roller by using the supply part which consists of a thin tube. Explanatory drawing which shows a mode that lubricating oil is supplied to the contact part of a cam and a roller in the valve gear of Embodiment 2 by using the supply part consisting of a half-split type pipe Explanatory drawing which shows a mode that lubricating oil is supplied to the contact part of a cam and a roller in the valve gear of Embodiment 3 by using the plate-shaped supply part. Explanatory drawing of the cam fixed to the camshaft provided in the valve gear of Reference Example 4 Sectional view taken along line CC of FIG.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. In this embodiment, the valve gear 10 in the slant engine (an example of the internal combustion engine 1) will be described. The axis of the cylinder (not shown) of the internal combustion engine 1 is set to be tilted at an angle of 60 to 70 ° with respect to the vertical direction.

FIG. 1 is a cross-sectional view of a valve operating device (valve closed state) 10 of the internal combustion engine 1 according to the first embodiment. FIG. 1 shows a cross-sectional view of the valve gear 10 as viewed from the front side. As shown in FIG. 1, the cylinder head 2 included in the internal combustion engine 1 is provided with an intake valve 4 for opening and closing the intake port 3 and an exhaust valve (not shown) for opening and closing the exhaust port (not shown). There is. In the present embodiment, the valve operating device 10 on the intake side that opens and closes the intake valve 4 will be described. The basic configuration of the valve gear on the exhaust side that opens and closes the exhaust valve is the same as that on the intake side, and detailed description thereof will be omitted.

The intake valve 4 includes a disc-shaped valve member 4a, a rod-shaped valve stem 4b extending from the valve member 4a, and a disc-shaped spring pressing portion 4c. The intake port 3 described above is arranged at the end of an intake passage 15 provided in the cylinder head 2, and a valve member 4a is used to open and close such an intake port 3. The valve stem 4b is arranged so as to be inclined with respect to the horizontal direction (or the vertical direction) while penetrating the outer wall of the intake passage 15. One end of the valve stem 4b is fixed to the valve member 4a, and the other end projects to the outside of the cylinder head 2.

A spring holding portion 4c is attached to the protruding other end side. A valve spring 12 made of a coiled compression spring is interposed between the spring pressing portion 4c and the cylinder head 2. Further, the other end (end 4b1) of the valve stem 4b is in contact with one end of the roller arm 13, as will be described later.

The cam 14 is fixed to the cam shaft 16 so as to project outward from the outer peripheral surface of the cam shaft 16, and rotates integrally with the cam shaft 16. The camshaft 16 is a rotating shaft that transmits the power of the rotating cam 14 to the intake valve 4 via the roller arm 13. A timing belt (not shown) for transmitting the rotational power of the crankshaft is hung between the camshaft 16 and the crankshaft (not shown) included in the internal combustion engine 1, and a timing belt (not shown) is hung through the timing belt. The cuff shaft 16 rotates in conjunction with the crank shaft. In FIG. 1, the cam 14 and the camshaft 16 rotate clockwise.

The camshaft 16 has a tubular shape including a lubricating oil passage 16a extending along the axial direction. The lubricating oil passage 16a is a passage through which lubricating oil (oil) used for lubrication of the valve drive device 10 (for example, lubrication of the contact portion X1 between the cam 14 and the roller 130) flows, and the cam shaft 16 It is surrounded by a cylindrical wall 160 that constitutes the above.

The wall 160 of the camshaft 16 is formed with a discharge hole portion 161 for discharging the lubricating oil flowing through the lubricating oil passage 16a to the outside of the camshaft 16. The discharge hole portion 161 is provided at a position on the wall 160 near the cam 14. Such a discharge hole portion 161 is provided so as to penetrate the wall 160. Further, the lubricating oil discharged from the discharge hole 161 is supplied to the discharge hole 161 toward the contact portion X1 or the like between the cam 14 and the roller 130 to lubricate the contact portion X1 or the like. 17 is attached. The details of the lubrication method of the valve gear 10 using the supply unit 17 will be described later.

The cam 14 has an outer peripheral surface (cam surface) composed of a non-lift surface 14a and a lift surface 14b continuous with the non-lift surface 14a. The non-lift surface 14a is a surface having the same distance from the center of rotation and located within the same radius, and the lift surface 14b is a surface in which the distance from the center of rotation gradually increases toward the apex 14c farthest from the center of rotation. is there.

The roller arm (rocker arm) 13 is made of metal, and by swinging according to the rotation of the cam 14, the rotational motion of the cam 14 is converted into a linear reciprocating motion and transmitted to the intake valve 4. The roller arm 13 includes a roller 130 including a roller surface 130a that contacts the cam surface (non-lift surface 14a and lift surface 14b) of the cam 14. The roller 130 is supported by the main body of the roller arm in a state of being rotatable by a roller pin via a plurality of needle rollers. The roller surface 130a is formed of an arcuate surface having a constant curvature, and its width is set to be substantially the same as the cam surface (non-lift surface 14a and lift surface 14b) of the cam 14.

A pivot receiving portion 13a is formed at one end of the roller arm 13. The pivot receiving portion 13a is arranged at a higher position in the vertical direction than the roller 130. Further, the pivot receiving portion 13a is arranged at a position higher in the vertical direction than the cam 14 and the cam shaft 16. The pivot receiving portion 13a has a shape in which the inner surface side facing the pivot 11 is recessed in a hemispherical shape, and the recessed portion comes into contact with the tip portion of the pivot 11. The outer surface side of the pivot receiving portion 13a has a hemispherically bulging shape.

Further, a pressing portion 13b that comes into contact with the end portion 4b1 of the valve stem 4b and presses the valve stem 4b is formed at the other end portion of the roller arm 13. The pressing portion 13b is arranged at a position lower than that of the roller 130 in the vertical direction. The pressing portion 13b has a substantially plate shape.

The pivot 11 is made of metal, and as a whole, includes a main body portion 11a having a cylindrical body having a tapered tip side. The tip of the pivot 11 (the tip of the main body 11a) 11b is formed in a spherical shape and comes into contact with the inner surface of the pivot receiving portion 13a. The pivot 11 is attached to a concave attachment portion 5 provided so as to open on the side surface 2b of the cylinder head 2. The pivot 11 is attached to the attachment portion 5 so as to be inclined so that the front end 11b side is arranged below the rear end 11c side with respect to the horizontal direction.

The mounting portion 5 includes a concave hole (recess) and a peripheral surface surrounding the hole. The pivot 11 is attached to the mounting portion 5 so that the front end 11b side is inserted from the rear end 11c side so as to protrude from the side surface 2b of the cylinder head 2. An air escape hole (not shown) communicating with the outside is formed on the peripheral surface on the bottom side of the mounting portion 5, so that the pivot 11 can be easily mounted on the mounting portion 5.

In such a valve gear 10, when the non-lift surface 14a of the rotating cam 14 is in contact with the roller surface 130a of the roller arm 13, as shown in FIG. 1, the intake valve 4 is the valve spring 12 The valve member 4a is seated at the end of the intake port 3 and the intake port 3 is closed. That is, the intake valve 4 is closed. When the cam 14 rotates from this state and the lift surface 14b (the apex 14c of the lift surface 14b) comes into contact with the roller surface 130a, the roller surface 130a is pressed by the lift surface 14b, and the roller arm 13 uses the tip 11b of the pivot 11 as a fulcrum. Swings. FIG. 2 is a cross-sectional view of the valve gear (valve open state) 10 of the internal combustion engine 1 according to the first embodiment. As shown in FIG. 2, when the roller arm 13 swings, the end portion of the valve stem 4b is pressed by the pressing portion 13b, the valve stem 4b moves in the axial direction, and the valve member 4a of the intake valve 4 takes in air. The intake port 3 is opened away from the end of the port 3. That is, the intake valve 4 is in the valve open state.

In the state where the valve gear 10 is operating in this way, lubricating oil is supplied to the contact portion X1 and the like between the cam 14 and the roller 130 by using the supply unit 17, and such contact portion X1 Etc. are maintained in a lubricated state. Hereinafter, a mechanism in which the lubricating oil is supplied to the contact portion X1 between the cam 14 and the roller 130 and the other contact portions X2 and X3 will be described together with FIGS. 1 and 2 with reference to FIG.

FIG. 3 is an explanatory view showing how the lubricating oil S is supplied to the contact portion X1 between the cam 14 and the roller 130 by using the supply portion 17 made of a thin tube (hollow pin). FIG. 3 shows cross-sectional views of the cam shaft 16, the cam 14, and the roller 130 in a state of being cut along the axial direction L. The right side of FIG. 3 is the front side, and the left side is the rear side.

When the internal combustion engine 1 starts, the oil pump included in the internal combustion engine 1 operates, and lubricating oil (oil) is pumped to an oil gallery (not shown). Then, the lubricating oil pumped from the oil gallery is supplied to the lubricating oil passage 16a in the camshaft 16. The lubricating oil supplied to the lubricating oil passage 16a flows along the axial direction L, and a part of the lubricating oil is distributed to the discharge hole portion 161 provided in the middle of the lubricating oil passage 16a. As shown in FIG. 3, the discharge hole portion 161 is provided so as to penetrate the wall 160 of the camshaft 16 arranged near the cam 14. Then, a supply portion 17 made of a long metal tubular tube is inserted into the discharge hole portion 161. The supply unit 17 communicates with the lubricating oil passage 16a via the discharge hole portion 161. The lubricating oil S in the lubricating oil passage 16a is discharged to the outside of the camshaft 16 through the inside of the supply unit 17. Lubrication.

One end (base end) 17a of the supply portion 17 is inserted into the discharge hole portion 161 and the other end (tip) 17b faces the apex 14c side of the lift surface 14b of the cam 14. There is. The supply unit 17 rotates together with the camshaft 16 in a state where the end (base end) 17a is fixed to the camshaft 16 and the supply unit 17 rises diagonally from the outer peripheral surface of the camshaft 16. As shown in FIG. 3, in a state where the lift surface 14b of the cam 14 is in contact with the roller surface 130a, the tip 17b of the supply unit 17 is the outer peripheral surface (lift surface 14b) of the cam 14 and the roller surface 130a of the roller 130. It is shaped toward the contact portion (contact) X1 with. The position of the tip 17b of the supply unit 17 is preferably close to the contact portion X1. The length (size) of the supply unit 17 is set so as not to come into contact with the cam 14 and other peripheral members during rotation. The discharge hole portion 161 is provided on the inner peripheral surface 160a side in order to facilitate the tip 17b toward the contact portion X1 or the like between the cam 14 and the roller 130 when the base end 17a of the straight supply portion 17 is attached. It has a shape that penetrates the inside of the wall 160 while inclining toward the cam 14 side toward the outer peripheral surface 160b side.

Since the supply unit 17 rotates together with the camshaft 16, the lubricating oil S is discharged from the tip 17b of the supply unit 17 in a form of being scattered around by receiving centrifugal force so as to draw an arc as a whole. The tip 17b of the rotating supply unit 17 is directed not only to the contact portion X1 between the roller 130 and the cam 14, but also to the contact portion X2 between the tip 11b of the pivot 11 and the pivot receiving portion 13a, and the end of the valve stem 4b. A contact portion X3 between the portion 4b1 and the pressing portion 13b is arranged. These three contact portions X1 to X3 are arranged in a substantially row along the longitudinal direction of the roller arm 13. In the case of the present embodiment, in order from the top, the contact portion X2 between the tip 11b of the pivot 11 and the pivot receiving portion 13a, the contact portion X1 between the roller 130 and the cam 14, and the end 4b1 and the pressing portion 13b of the valve stem 4b. The contact portions X3 are arranged in a substantially vertical direction while being arranged in a substantially row.

In this way, since the contact portions X1 and the like between the rollers 130 and the cam 14 are arranged in a row, the lubricating oil S scattered from the tip 17b of the supply portion 17 is surely applied to the contact portions X1 to X3. It adheres and can keep those parts lubricated. Further, even if the lubricating oil S is arranged at a position higher than the cam 14 or the like, such as the contact portion X2 between the tip end 11b of the pivot 11 and the pivot receiving portion 13a, the lubricating oil S is directly supplied from the supply portion 17. Become. Some of the lubricating oil adhering to the contact portion X2 and the like moves by its own weight to the contact portion X1 and the contact portion X3 along the roller arm 13. In this way, in the valve gear 10, the occurrence of problems such as seizure in each of the contact portions X1 to X3 is suppressed.

The valve operating device 10 of the present embodiment uses centrifugal force to scatter the lubricating oil from the tip of the supply unit 17 even when the viscosity of the lubricating oil is high at the time of starting the internal combustion engine 1, etc., to disperse the lubricating oil from each contact portion. Lubricating oil can be supplied to X1 to X3. Similarly, even when the internal combustion engine 1 is in an idle state or the like and the oil pressure of the lubricating oil discharged from the discharge hole 161 is low, the lubricating oil is scattered from the tip of the supply unit 17 by using centrifugal force. Lubricating oil can be supplied to each of the contact portions X1 to X3.

Further, in the valve gear 10 of the present embodiment, since the discharge hole portion 161 is not provided in the cam 14 but is provided in the cam shaft 16, the discharge hole portion 161 is periodically closed on the surface of the roller 130. Lubricating oil can be evenly scattered around without peeling off.

Further, since the supply unit 17 of the present embodiment is composed of a thin pipe communicating with the lubricating oil passage 16a, the lubricating oil S can be discharged to the outside of the supply unit 17 by utilizing the oil pressure in the lubricating oil passage 16a. , It is easy to reliably supply the lubricating oil S to the target location (the contact portion).

A plurality of the discharge hole portions 161 and the supply portion 17 as described above are provided on the camshaft 16 so that one can be assigned to each of the plurality of cams 14 provided on the camshaft 16. ing.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In FIG. 4, the lubricating oil S is supplied to the contact portion X1 between the cam 14 and the roller 130 in the valve gear 10A of the second embodiment by using a supply unit 17A composed of a half-split type pipe (so-called split pin). It is explanatory drawing which shows the state of this. The valve gear 10A of the second embodiment uses the supply unit 17A made of a half-split pipe instead of the supply part 17 made of the thin pipe of the first embodiment. The configurations other than the supply unit 17A are the same as those in the first embodiment, and the same configurations as those in the first embodiment are designated by the same reference numerals in FIG. 4, and detailed description thereof will be omitted. Similarly, the detailed description of the same configuration as that of the first embodiment will be omitted for the following embodiments and the like.

The supply portion 17A is attached so that one end 17Aa is inserted into the discharge hole portion 161 and the other end 17Ab is a longitudinal half-split type toward the contact portion X1 between the cam 14 and the roller 130 of the roller arm 13. It consists of pipes. The supply portion 17A includes a concave groove 17A1 extending in the longitudinal direction, and the lubricating oil S discharged from the discharge hole portion 161 flows along the concave groove 17A1. The lubricating oil S flowing through the concave groove 17A1 finally receives centrifugal force from the tip 17Aa of the supply unit 17A and scatters toward the contact portion X1 and the like. The recess 17A1 is set so as to face the rotation direction because it is easy to receive the lubricating oil S and it is easy to guide the lubricating oil S to a target location.

As described above, the supply portion 17A may be formed of a half-split type pipe provided with the concave groove 17A1, and as in the first embodiment, the lubricating oil discharged from the discharge hole portion 161 is brought into contact with the contact portion X1. Etc. can be supplied.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 5 is an explanatory view showing how the lubricating oil S is supplied to the contact portion X1 between the cam 14 and the roller 130 in the valve gear 10B of the third embodiment by using the plate-shaped supply portion 17B. The valve gear 10B of the third embodiment has the same configuration as that of the first embodiment except that the shape of the supply portion 17B and the shape of the discharge hole portion 161B are different. The same reference numerals are given in FIG. 5, and detailed description thereof will be omitted.

Like the discharge hole portion 161 of the first embodiment, the discharge hole portion 161B is provided so as to penetrate the wall 160 of the camshaft 16 near the cam 14. However, in the case of the present embodiment, the discharge hole portion 161B is provided on the wall 160 so as to penetrate along the thickness direction. As shown in FIG. 5, the supply unit 17B has a plate shape (disc shape) as a whole, and has a bottom portion 17B1 made of an annular flat plate attached around the camshaft 16. It is provided with an outer peripheral edge portion 17B2 extending outward from the peripheral edge of the bottom portion 17B1 toward the cam 14 side. A hole 17B3 through which the camshaft 16 is inserted is provided in the center of the bottom 17B1, and the bottom 17B1 is fixed to the camshaft 16 so that the camshaft 16 is inserted into the hole 17B3. .. The fixed position of the bottom portion 17B1 of the supply portion 17B is set on the cam shaft 16 so that the discharge hole portion 161B is arranged between the supply portion 17B and the cam 14, and is close to the discharge hole portion 161B. The outer open end 161B1 of the discharge hole portion 161B is located near the bottom portion 17B1 and faces the outer peripheral edge portion 17B2. The lubricating oil S discharged from the discharge hole portion 161B moves while spreading outward along the bottom portion 17B1 and the outer peripheral edge portion 17B2 of the supply portion 17B that rotates together with the camshaft 16. As the lubricating oil S moves outward along the bottom 17B1, the moving speed (flow velocity) increases due to centrifugal force. Then, when the lubricating oil S reaches the outer peripheral edge portion 17B2 rising from the bottom portion 17B1, the traveling direction (inertial direction) of the lubricating oil S is directed by the outer peripheral edge portion 17B2 toward the contact portion X1 of the cam 14 and the roller 130. Be changed. Finally, the lubricating oil S is blown from the outer peripheral edge portion 17B2 so as to draw an arc as a whole while heading toward the contact portion X1 and the like.

As described above, the supply unit 17B may have a plate shape, and the lubricating oil S discharged from the discharge hole portion 161B can be supplied toward the contact portion X1 or the like as in the first embodiment.

<Reference example 4>
Next, Reference Example 4 of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is an explanatory view of a cam 14C fixed to a camshaft 16 included in the valve gear 10C of Reference Example 4, and FIG. 7 is a sectional view taken along line CC of FIG. In this reference example, of the surface of the cam 14C (the cam surface composed of the non-lift surface 14Ca and the lift surface 14Cb), the discharge hole portion 161C is formed so as to open in the non-lift surface 14Ca. The discharge hole portion 161C is connected to the lubricating oil passage 16a inside the hollow (cylindrical) camshaft 16. A groove 18 is formed on the surface of the cam 14C (non-lift surface 14Ca) so as to surround the discharge hole 161C. The holding portion 140 is temporarily held between the discharge hole portion 161C and the groove portion 18 so that the lubricating oil S discharged from the discharge hole portion 161C does not spread along the surface of the cam 14C. Is formed. The holding portion 140 is formed of a part of the cam surface (non-lift surface 14Ca) of the cam 14C, and is composed of an annular surface surrounding the opening end 161C1 of the discharge hole portion 161B.

The lubricating oil S discharged from the discharge hole portion 161B does not spread along the surface (cam surface) of the cam 14C due to the action of surface tension, and becomes substantially hemispherical on the holding portion 140 around the opening end 161C1. It is in a raised state (see reference numeral S1 in FIG. 7). When the lubricating oil S is raised in this way, the lubricating oil S tends to scatter from the rotating cam 14C toward its surroundings (for example, the contact portions X2 and X3). By forming the groove portion 18 and the holding portion 140 in the cam 14C in this way, the lubricating oil discharged from the discharge hole portion 161C when the viscosity of the lubricating oil S is high at the time of starting the internal combustion engine or in an idle state or the like. Even when the viscosity of S is low, the lubricating oil S is likely to scatter due to centrifugal force. The contact portion X1 between the cam 14C and the roller of the roller arm is also lubricated by using the lubricating oil S discharged from the discharge hole portion 161C.

<Other Embodiments>
The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) Although the valve gear of each of the above embodiments is for a slant engine, the valve gear of the present invention is not limited to this, and other engines (for example, an engine in which the axis of the cylinder is in the vertical direction). May be used for.

(2) The valve gear of the first embodiment includes a supply unit made of a thin pipe, but in other embodiments, the base end side is made of a thin pipe, and a half-split pipe is formed from the middle to the tip. You may use the supply part which is provided.

(3) In the third embodiment, a plate-shaped supply portion including a bottom portion and an outer peripheral edge portion rising from the peripheral edge of the bottom portion is used, but in other embodiments, for example, a mortar-shaped portion such as an inverted cone is used. A supply unit may be used.

1 ... Internal combustion engine, 2 ... Cylinder head, 3 ... Intake port, 4 ... Intake valve, 4a ... Valve member, 4b ... Valve stem, 10 ... Valve device, 11 ... Pivot, 12 ... Valve spring, 13 ... Roller arm, 13a ... Pivot receiving part, 13b ... Pressing part, 14 ... Cam, 15 ... Intake passage, 16 ... Camshaft, 16a ... Lubricating oil passage, 160 ... Wall, 161 ... Discharge hole part, 17 ... Supply part, S ... Lubricating oil (Oil), X1 ... Contact part between cam and roller

Claims (4)

A camshaft that has a tubular shape that includes a lubricating oil passage that extends along the axial direction and rotates in conjunction with the rotation of the crankshaft.
A cam that is fixed to the camshaft and rotates together with the camshaft so as to project outward from the outer peripheral surface of the camshaft.
A valve gear that has a roller that is rotatably supported and comes into contact with the cam, and has a roller arm that has one end side as a fulcrum and the other end side swings.
A discharge hole portion which is provided so as to penetrate the wall of the camshaft arranged near the cam and discharges the lubricating oil flowing through the lubricating oil passage to the outside of the camshaft.
The lubricating oil, which is fixed to the camshaft so as to rotate with the camshaft and is discharged from the discharge hole portion, is supplied in a form of scattering while being transmitted to at least a contact portion between the cam and the roller. and a supply unit which,
The supply unit is a valve gear having one end inserted into the discharge hole and the other end having a longitudinal shape toward the contact portion. The valve gear according to claim 1, wherein the supply unit comprises a thin tube communicating with the lubricating oil passage through the discharge hole portion. The motion according to claim 1 or 2, wherein the supply unit, together with the contact portion, disperses and supplies the lubricating oil toward the one end side of the roller arm and the other end side. Valve device. The valve gear according to any one of claims 1 to 3, wherein the roller arm has one end side arranged at a position higher than the camshaft in the vertical direction.

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