JP7232148B2 - engine valve train - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine valve train, and more particularly to an engine valve train in which the lubricity of a valve driving portion is increased.

Conventionally, as shown in FIG. 15(A), a pivot (101), a rocker arm (102) pivotally supported on the pivot (101), a valve drive section (103), and a rocker arm (103) from the valve drive section (103) 102), there is an engine valve train provided with an exhaust or intake valve (104) (see, for example, Patent Document 1).
As shown in FIG. 15(B), in this valve gear, the rocker arm (102) includes an arm portion (105) and an oil outflow boss portion (108). An oil outflow surface (109) formed on the upper surface, an oil outflow hole (110) opened in the center of the oil outflow surface (109), a peripheral surface (108a), and the oil outflow surface (109) and the peripheral surface. Boundary edges (111) (111) are formed on the boundary of (108a), and the boundary edges (111) (111) are formed by side edges (114) (114) ( 114), and as shown in FIG. 15(A), the boundary edge (111) is not formed on the input/output side (112a) (115a) of the oil outflow surface (109), and the oil outflow Input/output portion sides (112a) and (115a) of the surface (109) are flush with the upper surface (105a) of the arm portion (105).

Japanese Patent Application Laid-Open No. 7-150921 (see FIGS. 3 and 4)

<Problem> There is a risk that the lubricity of the valve driving portion will be reduced.
In the valve train, the engine oil flowing out from the oil outflow hole (110) to the oil outflow surface (109) flows down from the side edges (114) (114) under its own weight, so it easily flows to both sides. , the input/output side (112a) and (115a) are difficult to flow due to the flow resistance received from the upper surface of the arm (105). In addition, the engine oil (113) is particularly difficult to flow to the input end (106) side, which is lifted during the period when the valve (104) is open. Therefore, it is difficult to supply the engine oil (113) to the valve drive section (103) on the input end (106) side, and the lubricity of the valve drive section (103) may deteriorate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an engine valve gear in which the lubricity of the valve driving portion is enhanced.

(Invention specifying matters common to the inventions according to claims 1, 3, 5, 7, 13 and 17)
As illustrated in FIG. 1(C), a pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and a rocker arm (2) from the valve drive section (3) ) with an exhaust or intake valve (4) driven via
As illustrated in FIG. 1B, the rocker arm (2) includes an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an arm Equipped with an output portion (7) on the other end side of the portion (5) and an oil outflow boss portion (8),
As illustrated in FIG. 1(A), the oil outflow boss portion (8) has an oil outflow surface (9) formed on the upper surface and an oil outflow hole opened at the center of the oil outflow surface (9). (10), a peripheral surface (8a), and a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input An engine valve train configured to flow down from a side edge (12) and be supplied to a valve drive section (3) on the side of an input section (6) illustrated in FIG. 1(C).
(Matters specifying the invention specific to the invention of claim 1)
As illustrated in FIGS. 1(A) and 1(C), the boundary edge (11) has side edges (14) (14) in the axial direction of the pivot (1),
The input side flow path (12a) from the oil outflow hole (10) to the input side edge (12) is the side side flow path from the oil outflow hole (10) to the side side edges (14)(14). (14a) A valve gear for an engine characterized by being constructed to be shorter than (14a).
(Matters specifying the invention specific to the invention of claim 3)
As illustrated in FIG. 1(A), the boundary edge (11) consists of an output side edge (15) on the output side (7) and a side edge (15) in the axial direction of the pivot (1). 14) comprising (14),
The output side flow path (15a) from the oil outflow hole (10) to the output side edge (15) is the side side flow path from the oil outflow hole (10) to the side side edges (14)(14). (14a) A valve gear for an engine characterized by being constructed to be shorter than (14a).
(Matters specifying the invention specific to the invention of claim 5)
As illustrated in FIG. 1(A), the longitudinal direction of the arm portion (5) is the input/output direction, and the axial direction of the pivot (1) is the width direction,
A valve gear for an engine, wherein an oil outflow surface (9) has a length (9a) in the input/output direction shorter than a length (9b) in the width direction.
(Matters specifying the invention specific to the invention of claim 7)
As illustrated in FIG. 1(C), during the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented along the horizontal direction. engine valve train.
(Matters specifying the invention specific to the invention of claim 13)
As illustrated in FIG. 1(C), during the fully closed periods (4a) and (4b) of the valve (4), the downward inclination angle (16a) of the input section side guide surface (16) changes to the output section side guide surface ( 17) 2 to 6 times the downward inclination angle (17a).
(Matters specifying the invention specific to the invention of claim 17)
As illustrated in FIG. 9, the rocker arm (2) is an input portion that guides the engine oil (13) that has flowed down from the oil outflow boss portion (8) onto the upper surface of the arm portion (5) to the input portion (6). provided with a side guide surface (16),
With the axial direction of the pivot (1) as the width direction, both width direction edges (16b) (16b) of the input section side guide surface (16) located at both ends in the width direction of the arm section (5) A valve gear for an engine, characterized in that it is widened from (6) toward the oil outflow boss (8) side.

(Invention effects common to the inventions according to claims 1, 3, 5, 7, 13, and 17)
<<Effect>> The lubricity of the valve driving portion (3) is enhanced.
In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. , the engine oil (13) is sufficiently supplied to the valve drive section (3) on the input section (6) side illustrated in FIG. increases lubricity.
(Effect of the Invention Specific to the Invention of Claim 1)
<<Effect>> The lubricity of the valve driving portion (3) is enhanced.
In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. Since a large amount of oil flows to the input part (6) side through the input part side flow path (12a), the engine oil (13) is sufficiently supplied to the valve driving part (3) on the input part (6) side shown in FIG. 1(C). As a result, the lubricity of the valve driving portion (3) is enhanced.
(Effect of the invention specific to the invention according to claim 3)
<<Effect>> The lubricity of the valve (4) is increased.
In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. Since a large amount of oil flows to the output portion (7) side through the output portion side flow path (15a), the engine oil (13) is sufficiently supplied to the valve (4) on the output portion (7) side shown in FIG. 1(C). and the valve (4) becomes more lubricated.
(Effect of the invention specific to the invention according to claim 5)
<<Effect>> The lubricity of the valve driving portion (3) and the valve (4) is enhanced.
In this valve gear, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. Since a large amount of water flows to the input/output part (6) and (7) side through the input/output part side flow paths (12a) and (15a) that are less susceptible to resistance, the input/output part (6) and (7) side shown in FIG. 1(C) The engine oil (13) is sufficiently supplied to the valve driving portion (3) and the valve (4) of the valve, and the lubricating properties of the valve driving portion (3) and the valve (4) are enhanced.
(Effect of the invention specific to the invention according to claim 7)
<<Effect>> The lubricity of the valve driving portion (3) and the valve (4) is enhanced.
In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. During the relatively long fully closed periods (4a) and (4b) shown in FIG. The engine oil (13) is sufficiently supplied to the valve drive section (3) on the input/output section (6) and (7) side and the valve (4) on the output section (7) side, and the valve drive section ( 3) and the valve (4) are more lubricated.
(Effect of the Invention Specific to the Invention of Claim 13)
<Effect> The valve driving part (3) and the valve (4) are lubricated just enough.
In this valve train, when the value is less than 2 times, or when the value exceeds 6 times, the supply of engine oil (13) to the input part (6) side and the output part (7) side The balance is lost, and in the former case, the input section (6) side is undersupplied, and in the latter case, the output section (7) side is likely to be undersupplied. Valve drive (3) and valve (4) are lubricated just enough.
(Effect of the invention specific to the invention according to claim 17)
<<Effect>> The lubricity of the valve driving portion (3) is enhanced.
In this valve train, as shown in FIGS. 9(A) and 9(B), the engine oil (13) flowing down from the oil outflow boss (8) onto the upper surface of the arm (5) is A) is received by the widened input section side guide surface (16) and guided to the input section (6) side, so the engine oil (13 ) is sufficiently supplied, and the lubricity of the valve driving portion (3) is enhanced.

1(A) is an enlarged plan view of a rocker arm, FIG. 1(B) is a plan view of a rocker arm, and FIG. ) is a side view of the rocker arm and its periphery. Fig. 2(A) shows a cylinder head equipped with a basic example of a valve train and its surroundings in a cross-sectional front view; there is 3(A) is a valve opening period, FIG. 3(B) is an exhaust valve opening/closing period, and FIG. 3(C) is an intake valve opening/closing period. showing. 1 is a plan view of a cylinder head with a basic example of a valve train; FIG. FIG. 5 is an elevation cross-sectional side view of the cylinder head of FIG. 4 and its surroundings; FIG. 1(C) equivalent view of Modification 1 of the valve train. 7(A) is a view corresponding to FIG. 1(C), and FIG. 7(B) is an enlarged view of an oil outflow boss portion. FIG. FIG. 1(C) equivalent view of Modification 3 of the valve gear. 9(A) is a view corresponding to FIG. 1(B), and FIG. 9(B) is a view corresponding to FIG. 1(C). FIG. 1(C) equivalent view of modification 5 of the valve gear. FIG. 1C is a view corresponding to FIG. 1(C) of Modification 6 of the valve gear. 12(A) shows a basic example and FIG. 12(B) shows a seventh modified example. 13(A) is a diagram for explaining the tappet, FIG. 13(A) is for the basic example, and FIG. 13(B) is for the eighth modified example. 14(A) is a plan view of a rocker arm, FIG . 14(B) is a sectional view taken along the line BB of FIG. 14(A), and FIG. C) is a sectional view taken along line CC of FIG. 14(A). 15(A) is a side view, and FIG. 15(B) is a sectional view taken along the line BB of FIG. 15(A).

1 to 13 are diagrams for explaining an engine valve train according to an embodiment of the present invention. FIGS. 1 to 5 are basic examples of the valve train, and FIGS. 6 to 13 are modifications 1 of the valve train. ~9 8 is shown. In this embodiment, a vertical four-stroke in-line multi-cylinder diesel engine equipped with an overhead valve gear will be described. FIG. 14 shows Modification 9 of the valve train, which is a reference example not included in the embodiment.

As shown in FIGS. 2(A) and 2(B), an engine equipped with a valve train consists of a cylinder block (29), a cylinder head (30) assembled on top of the cylinder block (29), and a cylinder head ( 30) has a head cover (31) assembled on top.

First, a basic example of the valve train shown in FIGS. 1 to 5 will be described.
As shown in FIG. 1(C), the valve train includes a pivot (1), a rocker arm (2) pivoted on the pivot (1), a valve drive section (3), and a valve drive section (3). It has a valve (4) actuated via a rocker arm (2).

As shown in FIGS. 2(A) and 2(B), the valve driver (3) includes a valve camshaft (32) and a tappet (28) on the valve cam (32a) of the valve camshaft (32). and a push rod (27) between the tappet (28) and the rocker arm (2).
The valve (4) shown in FIGS. 2(A) and 2(B) is an exhaust valve. The intake valve is also driven by the same mechanism as the exhaust valve. A valve cap (33) is attached to the upper end of the valve (4), and the valve cap (33) abuts the output portion (7) of the rocker arm (2). A spring retainer (34) is attached to the valve (4), a compressed valve spring (35) is arranged between the spring retainer (34) and the cylinder head (30), and the valve (4) is attached to the valve spring (35). ) is urged upward in the valve closing direction.
As shown in FIG. 4, rocker arms (2), push rods (27) shown in FIG. , and three pairs of valve operating cams (32a) are provided.
The three pairs of rocker arms (2) are pivotally supported on pivots (1) that span three rocker arm brackets (36) on the cylinder head (30).

As shown in FIG. 1(B), the rocker arm (2) includes an arm portion (5) that intersects with the pivot (1), an input portion (6) at one end of the arm portion (5), and an arm portion. (5) It has an output portion (7) on the other end side and an oil outflow boss portion (8).

As shown in FIG. 1(A), the oil outflow boss portion (8) has an oil outflow surface (9) formed on the top surface and an oil outflow hole (9) opened at the center of the oil outflow surface (9). 10), a peripheral surface (8a), and a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a).
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input It is configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the side of the input section (6) shown in FIG. 1(C).

In this valve gear, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. The engine oil (13) flows easily to the input part (6) side, and the engine oil (13) is sufficiently supplied to the valve driving part (3) on the input part (6) side shown in FIG. become more sexual.

As shown in FIG. 5, the oil supply path includes an oil strainer (38) immersed in engine oil (13) in an oil pan (37) and an oil pump (39) connected to the outlet side of the oil strainer (38). ), an oil gallery (42) connected to the discharge side of the oil pump (39), a shaft center passage (22) of the pivot (1) connected to the outlet side of the oil gallery (42), and a shaft center passage Equipped with a shaft peripheral wall hole (24) extending from (22) through a shaft peripheral wall (23) of the pivot (1) and a fitting gap (1a) between the pivot (1) and the rocker arm (2). there is
The engine oil (13) in the oil pan (37) passes through the oil supply path and is supplied to the oil outlet hole (10) of the rocker arm (2) in the order described above.

As shown in FIG. 1(A), the boundary edge (11) has side edges (14)(14) in the axial direction of the pivot (1).
The input side flow path (12a) from the oil outflow hole (10) to the input side edge (12) is the side side flow path from the oil outflow hole (10) to the side side edges (14)(14). (14a) is configured to be shorter than (14a).

In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. Since a large amount of oil flows to the input part (6) side through the input part side flow path (12a), the engine oil (13) is sufficiently supplied to the valve driving part (3) on the input part (6) side shown in FIG. 1(C). As a result, the lubricity of the valve driving portion (3) is enhanced.

As shown in FIG. 1(A), the output side flow path (15a) from the oil outflow hole (10) to the output side edge (15) extends from the oil outflow hole (10) to the side edge (14). ) and (14) are configured to be shorter than the side flow passages (14a) (14a).

In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. Since a large amount of oil flows to the output portion (7) side through the output portion side passage (15a), the engine oil (13) is sufficiently supplied to the valve (4) on the output portion (7) side shown in FIG. 1(C). , the lubricity of the valve (4) is increased.

As shown in FIG. 1(A), the longitudinal direction of the arm portion 5 is the input/output direction, and the axial length direction of the pivot 1 is the width direction. (9a) is shorter than the length (9b) in the width direction.

In this valve gear, the engine oil (13) flowing out from the oil outflow hole (10) to the oil outflow surface (9) shown in FIG. Since a large amount flows to the input/output portions (6) and (7) side through the input/output portion side flow paths (12a) and (15a), which are less susceptible to The engine oil (13) is sufficiently supplied to the valve driving section (3) and the valve (4), and the lubricating properties of the valve driving section (3) and the valve (4) are enhanced.

As shown in FIG. 1(A), the oil outflow surface (9) is formed in an oval shape elongated in the width direction in a plan view. The oil outflow surface (9) may be an ellipse or a rectangle elongated in the width direction in a plan view.

During the fully closed periods 4a and 4b shown in FIGS. 3B and 3C of the valve 4, as shown in FIG. Oriented.

In this valve train, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. During the relatively long fully closed periods (4a) and (4b) shown in FIG. engine oil (13) is sufficiently supplied to the valve drive section (3) on the input/output section (6) and (7) side and the valve (4) on the output section (7) side, and the valve drive section (3) ) and valve (4) are lubricated.

The fully closed periods (4a) and (4b) of the valve (4) shown in FIGS. 3(B) and (C) are set as follows.
As shown in FIG. 3A, during two rotations of the crankshaft in one combustion cycle, the open period of the exhaust valve is set to 230° in crank angle, and the open period of the intake valve is set to 230° in crank angle. It is set at 228°.
Therefore, as shown in FIG. 3B, the fully closed period (4a) of the exhaust valve is set to 490°, which is obtained by subtracting the open period of the intake valve of 230° from the 720° corresponding to two rotations of the crankshaft. .
Further, as shown in FIG. 3C, the fully closed period (4b) of the intake valve is set to 492°, which is obtained by subtracting the open period of the exhaust valve of 228° from 720° corresponding to two revolutions of the crankshaft.

As shown in FIGS. 1(A) and 1(C), the rocker arm (2) receives the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5) into the input portion (6). It has an input part side guide surface (16) that guides to.
During the fully closed periods 4a and 4b shown in FIGS. 3B and 3C of the valve 4, as shown in FIG. sloping downwards towards

In this valve train, the engine oil (13) that has flowed down onto the upper surface of the arm portion (5) shown in FIGS. During the fully closed period (4a) (4b), which is relatively long, the fluid flows toward the input section (6) along the downwardly inclined input section side guide surface (16) shown in FIG. 1(C). The engine oil (13) is sufficiently supplied to the valve driving portion (3) of the valve driving portion (3), and the lubricating property of the valve driving portion (3) is enhanced.

As shown in FIGS. 1(A) and 1(C), the rocker arm (2) discharges the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5) to the output portion (7). It has an output part side guide surface (17) that guides to.
During the fully closed periods 4a and 4b shown in FIGS. 3B and 3C of the valve 4, as shown in FIG. sloping downwards towards

In this valve train, the engine oil (13) that has flowed down onto the upper surface of the arm portion (5) shown in FIGS. During the fully closed period (4a) (4b), which is relatively long, the output part (7) side The engine oil (13) is sufficiently supplied to the valve (4) of the valve (4), and the lubricity of the valve (4) is enhanced.

During the fully closed periods (4a) and (4b) shown in FIGS. 3B and 3C of the valve 4, as shown in FIG. ) is larger than the downward inclination angle (17a) of the output side guide surface (17).

In this valve train, the engine oil (13) that has flowed down onto the upper surface of the arm portion (5) shown in FIGS. During the fully closed period (4a) (4b), which is relatively long, the flow toward the input section (6) along the input section side guide surface (16) having a large downward inclination angle (16a) shown in FIG. The engine oil (13) is sufficiently supplied to the valve drive section (3) on the side of the section (6), and the lubricity of the valve drive section (3) is enhanced.

During the fully closed periods (4a) and (4b) shown in FIGS. 3B and 3C of the valve 4, as shown in FIG. ) is four times the downward inclination angle (17a) of the output side guide surface (17). This value is preferably 2 to 6 times, more preferably 3 to 5 times, and most preferably 4 times.

When the above value is set to 2 to 6 times, the following effects are obtained.
If the value is less than 2 times, or if the value exceeds 6 times, the supply balance of the engine oil (13) to the input part (6) side and the output part (7) side will be lost, and in the former case Insufficient supply on the input part (6) side, and in the latter case, there is a risk of insufficient supply on the output part (7) side. and the valve (4) are lubricated just enough.
Values between 3 and 5 are more likely to provide good feed balance, while values of 4 provide the best feed balance.

The downward inclination angle (16a) of the input side guide surface (16) and the downward inclination angle (17a) of the output side guide surface (17) shown in FIG. 1(C) were measured as follows.
As shown in FIG. 1(C), a horizontal imaginary line passing through the vertex of the boundary between the input side guide surface (16) and the output side guide surface (17) is defined as a reference line (40). The inclination angles of the input/output part side guide surfaces (16) and (17) were measured as these downward inclination angles (16a) and (17a).
Since the output section side guide surface (17) shown in FIG. 1(C) is a flat surface without undulations, the downward inclination angle (17a) is 7° regardless of the measurement point.
The input section side guide surface (16) shown in FIG. 1(C) is a gently undulating S-shaped curved surface. , and the average value thereof is calculated, and the downward inclination angle (16a) is 28°.
The downward inclination angle (16a) of the input section side guide surface (16) is four times the downward inclination angle (17a) of the output section side guide surface (17).

The configuration and effects of the basic example of the valve train are as described above.
Modifications 1 to 9 of the valve train shown in FIGS. 6 to 14 will now be described.
These modified examples 1 to 9 employ the same configuration as the basic example except for the unique structure of the modified examples described below. In FIGS. 6 to 14, the same reference numerals as in the basic example are assigned to the same elements as in the basic example. In addition, these modified examples 1 to 9 can be used in combination with mutually unique structures as long as there is no structural contradiction.

Modification 1 shown in FIG. 6 has a downward inclination angle (16a) of the input section side guide surface (16) and a downward inclination angle (17a) of the output section side guide surface (17) larger than those of the basic example. is.
Since the output section side guide surface (17) shown in FIG. 6 is a flat surface without undulations, the downward inclination angle (17a) is 10° regardless of the measurement point.
Since the input side guide surface (16) shown in FIG. 6 is also a flat surface without undulations, the downward inclination angle (16a) is 40° regardless of the measurement point.
The downward inclination angle (16a) of the input section side guide surface (16) is four times the downward inclination angle (17a) of the output section side guide surface (17).

In the basic example, as shown in FIG. 1(C), the oil outflow surface 9 is horizontal during the fully closed periods 4a and 4b of the valve 4 shown in FIGS. 3(B) and 3(C). 7(A)(B), during the fully closed period (4a)(4b) shown in FIGS. 3(B)(C) of the valve (4), As shown in FIGS. 7(A) and (B), the oil outflow surface (9) is oriented in a downward sloping direction toward the input portion (6).

In the valve train of Modification 2, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. During the relatively long fully closed periods (4a) and (4b) shown in (C), as shown in FIG. The engine oil (13) is sufficiently supplied to the valve drive section (3) on the input section (6) side, and the lubricity of the valve drive section (3) is enhanced.

The downward inclination angle (9c) of the oil outflow surface (9) shown in FIGS. 7(A) and (B) was measured as follows.
As shown in FIG. 7(B), a horizontal imaginary line passing through the apex of the oil outflow surface (9) is defined as a reference line (41), and the inclination of the oil outflow surface (9) with respect to this reference line (41) is downwardly inclined . Angle (9c) .
Since the oil outflow surface (9) shown in FIGS. 7(A) and (B) is a flat surface without undulations, the downward inclination angle (9c) is 15° regardless of the measurement point.
The downward inclination angle (9c) of the oil outflow surface (9) shown in FIGS. 7(A) and (B) is preferably set to 5° to 25°, most preferably 15°.

When the downward inclination angle (9c) of the oil outflow surface (9) shown in FIGS. 7(A) and (B) is set to 5° to 25°, the following effects are obtained.
If the angle is less than 5° or if it exceeds 25°, the supply balance of the engine oil (13) to the input part (6) side and the output part (7) side will be lost, and the former will lose the input part (6). ) side is inadequate supply, and in the latter case, the output part (7) side may be inadequate supply. ) is lubricated just enough.
A setting of 15° provides the best feed balance.

In a basic example, as shown in FIG. 1(C), the oil outflow hole 10 is vertical during the fully closed periods 4a and 4b of the valve 4 shown in FIGS. 3(B) and 3(C). However, in the modification 3 shown in FIG. 8 , during the fully closed periods (4a) and (4b) shown in FIGS. ) is inclined upward toward the input section (6).

In the valve gear of Modified Example 3, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIG. The engine oil (13) on the oil outflow surface (9) easily flows toward the input section (6), and the engine oil (13) is sufficiently supplied to the valve driving section (3) on the input section (6) side, and the valve The lubricity of the driving part (3) is enhanced.

In Modification 3 shown in FIG. 8, similar to Modification 2 shown in FIG. oriented in a downward sloping direction.
In Modification 3 shown in FIG. 8, similarly to the basic example shown in FIG. may be directed to

In Modified Example 4 shown in FIGS. 9(A) and 9(B), like the basic example, the rocker arm (2) is designed to remove the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5). ) to the input section (6).
9(A) and 9(B), as shown in FIG. 9(A), the axial length direction of the pivot (1) is taken as the width direction, and the arms are positioned at both ends of the arm portion (5) in the width direction. Both width direction edges 16b and 16b of the input portion side guide surface 16 are widened from the input portion 6 toward the oil outflow boss portion 8 side.

In the valve train of Modification 4, as shown in FIGS. 9(A) and 9(B), the engine oil (13) flowing down from the oil outflow boss (8) onto the upper surface of the arm (5) is As shown in FIG. 9A, it is received by the widened input section side guide surface 16 and guided to the input section 6 side, so that the valve drive section 3 on the input section 6 side receives the engine. The oil (13) is sufficiently supplied, and the lubricating property of the valve driving part (3) is enhanced.

In the basic example of the rocker arm (2) shown in FIG. A shaft peripheral wall hole (24) is provided that extends from the passage (22) through the shaft peripheral wall (23) of the pivot (1), but there are only a pair of horizontal peripheral wall holes (24). During the fully closed periods (4a) and (4b) of the valve (4) shown in (B) and (C), the shaft peripheral wall hole (24) and the oil outflow hole (10) do not communicate directly.
In the fifth modification shown in FIG. 10, during the fully closed periods (4a) and (4b) shown in FIGS. 3(B) and (C) of the valve (4), as shown in FIG. Outflow holes (10) are in direct communication. That is, the axial peripheral wall hole 24 and the oil outflow hole 10 are connected in a row with their central axes aligned, and the outlet of the axial peripheral wall hole 24 and the inlet of the oil outflow hole 10 face each other. The shaft peripheral wall hole (24) directly communicates with the oil outflow hole (10) without intervening the fitting gap (1a) between the pivot (1) and the rocker arm (2).

In the valve train of Modification 5, during the relatively long fully closed periods (4a) and (4b) of the valve (4), the engine oil (13) flows from the shaft center passage (22) shown in FIG. 24), the engine oil (13) is sufficiently supplied to the input/output sections (6) and (7) because the oil flows out to the oil outflow surface (9) through the oil outlet hole (10) directly communicating with the input/output section. (6) The lubricity of the valve drive section (3) and the valve (4) on the (7) side is enhanced.

The pivot (1) shown in FIG. 10 has a pair of horizontal left and right shaft peripheral wall holes (24) and a pair of vertical upper and lower shaft peripheral wall holes (24). communicate directly.

In the sixth modification shown in FIG. 11, the rocker arm (2) has an oil injection hole (25) for injecting the engine oil (13) toward the valve drive section (3).

In the valve train of Modification 6, the engine oil (13) is injected from the oil injection hole (25) shown in FIG. (13) is sufficiently supplied, and the lubricity of the valve driving portion (3) is enhanced.

In the basic example of the valve train, as shown in FIG. 12(A), the input part (6) of the rocker arm (2) has an input bolt (26), and the valve driving part (3) has a push rod (27). ), and the upper end of the push rod (27) is provided with a concave bolt receiving surface (27a) for receiving the lower end (26a) of the projecting surface of the input bolt (26), and the bolt receiving surface (27a) is , and an oil reservoir recess (27b) recessed in the inner bottom thereof.

In the valve train of this basic example, the engine oil (13) is accumulated in the oil reservoir recess (27b) shown in FIG. 12(A). ) is sufficiently supplied, and the lubricity between the bolt lower end (26a) and the bolt receiving surface (27a) is enhanced.

In the basic example shown in FIG. 12(A), there is almost no gap between the bolt receiving surface (27a) and the bottom end of the bolt (26a). An oil reservoir space (27c) surrounding the bolt lower end (26a) is formed between the bolt lower end (26a) and the bolt lower end (26a).

In the valve train of Modified Example 7, the engine oil (13) is accumulated in the oil reservoir space (27c) shown in FIG. 12(B). 13) is sufficiently supplied, and the lubricity between the bolt lower end (26a) and the bolt receiving surface (27a) is enhanced.

In the basic example shown in FIG. 13(A), the valve drive section (3) includes a push rod (27) and a tappet (28), and the tappet (28) is the lower end of the projecting surface of the push rod (27). It has a concave curved rod receiving surface (28a) that receives the portion (27d).
In Modified Example 8 shown in FIG. 13(B), the rod receiving surface (28a) has an oil reservoir recess (28b) recessed in its inner bottom. Other structures are the same as the basic example shown in FIG.

In the valve train of Modification 8, the engine oil (13) is accumulated in the oil reservoir recess (28b) shown in FIG. 13) is sufficiently supplied, and the lubricity between the bolt lower end (26a) and the bolt receiving surface (27a) is enhanced.

Modification 9 shown in FIGS. 14A to 14C is a reference example not included in the embodiment.
In the ninth modification shown in FIGS. 14(A) to (C), the rocker arm (2) has an oil guide groove (18) recessed along the longitudinal direction on the upper surface of the arm portion (5), and an oil guide groove (18). The inner bottom surface (19) of (18) is provided with an oil outflow hole (10).
The inner bottom surface (19) of the oil guide groove (18) includes an input portion side inner bottom surface (20) for guiding the engine oil (13) flowing out of the oil outflow hole (10) to the input portion (6) side, and an output portion side inner bottom surface (20). It has an output part side inner bottom surface (21) that guides to the (7) side.
During the fully closed periods (4a) and (4b) shown in FIGS. 3(B) and (C) of the valve (4), as shown in FIG. ) is larger than the downward inclination angle (21a) of the inner bottom surface (21) on the output side.

In the valve train of Modification 9, the engine oil (13) flowing out from the oil outflow hole (10) into the oil guide groove (18) shown in FIGS. Therefore, the engine oil (13) is sufficiently supplied to the valve drive section (3) and the valve (4) on the input/output section (6) (7) side. , the lubrication of the valve driving part (3) and the valve (4) is enhanced.

In addition, in the valve train of Modification 9, the engine oil (13) flowing out from the oil outflow hole (10) shown in FIGS. During the relatively long fully closed periods (4a) and (4b) shown in FIGS. Therefore, the engine oil (13) is sufficiently supplied to the valve drive section (3) on the input section (6) side in particular, and the lubricity of the valve drive section (3) is enhanced.

The downward inclination angle (20a) of the input section side inner bottom surface (20) of Modification 9 shown in FIG. It is the same angle as (16a), and the downward inclination angle (21a) of the inner bottom surface (21) on the output side of Modification 9 shown in FIG. It is the same angle as the downward inclination angle (17a) of the guide surface (17).
As in the basic example shown in FIG. 1(C), during the fully closed periods (4a) and (4b) shown in FIGS. 3(B) and (C) of the valve (4), as shown in FIG. The downward inclination angle (20a) of the side inner bottom surface (20) is four times the downward inclination angle (21a) of the output side inner bottom surface (21). This value is preferably 2 to 6 times, more preferably 3 to 5 times, and most preferably 4 times.
The reason is the same as in the case of the basic example shown in FIG. 1(C).

(1) Pivot (2) Rocker arm (3) Valve drive unit (4) Valve (4a) (4b) Fully closed period (5) Arm unit (6) Input unit , (7) Output portion (8) Oil outflow boss portion (8a) Peripheral surface (9) Oil outflow surface (9a) Length in input/output direction (9b) Width direction Length, (10)... Oil outflow hole, (11)... Boundary edge, (12)... Input part side edge, (12a)... Input part side flow path, (13)... Engine oil, (14) Side edge (14a) Side flow path (15) Output side edge (15a) Output side flow path (16) Input side guide surface (16a) Downward Inclination angle (17) Output side guide surface (17a) Downward inclination angle (18) Oil guide groove (19) Inner bottom surface (20) Input side inner bottom surface (20a) Downward inclination angle (21)... Output part side inner bottom surface (21a)... Downward inclination angle (22)... Shaft center passage (23)... Shaft peripheral wall (24)... Shaft peripheral wall hole (25)... Oil Injection hole (26) Input bolt (26a) Lower end of bolt (27) Push rod (27a) Bolt receiving surface (27b) Oil reservoir recess (27c) Oil reservoir space ( 27d) ... rod lower end portion, (28) ... tappet, (28a) ... rod receiving surface, (28b) ... oil reservoir concave portion.

Claims (22)

A pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and an exhaust or intake pump driven from the valve drive section (3) through the rocker arm (2). with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an output portion on the other end side of the arm portion (5). (7) and an oil outflow boss (8),
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened in the center of the oil outflow surface (9), and a peripheral surface (8a). , a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input In the engine valve train configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the input section (6) side,
The boundary edge (11) comprises side edges (14) (14) in the axial direction of the pivot (1),
The input side flow path (12a) from the oil outflow hole (10) to the input side edge (12) is the side side flow path from the oil outflow hole (10) to the side side edges (14)(14). (14a) A valve gear for an engine characterized by being constructed to be shorter than (14a). In the engine valve train according to claim 1 ,
The boundary edge (11) has an output side edge (15) on the output side (7) and side edges (14) and (14) in the axial direction of the pivot (1),
The output side flow path (15a) from the oil outflow hole (10) to the output side edge (15) is the side side flow path from the oil outflow hole (10) to the side side edges (14)(14). (14a) A valve gear for an engine characterized by being constructed to be shorter than (14a). A pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and an exhaust or intake pump driven from the valve drive section (3) through the rocker arm (2). with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an output portion on the other end side of the arm portion (5). (7) and an oil outflow boss (8),
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened in the center of the oil outflow surface (9), and a peripheral surface (8a). , a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input In the engine valve train configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the input section (6) side,
The boundary edge (11) has an output side edge (15) on the output side (7) and side edges (14) and (14) in the axial direction of the pivot (1),
The output side flow path (15a) from the oil outflow hole (10) to the output side edge (15) is the side side flow path from the oil outflow hole (10) to the side side edges (14)(14). (14a) A valve gear for an engine characterized by being constructed to be shorter than (14a). In the engine valve train according to any one of claims 1 to 3,
With the longitudinal direction of the arm (5) as the input/output direction and the axial direction of the pivot (1) as the width direction,
A valve gear for an engine, wherein an oil outflow surface (9) has a length (9a) in the input/output direction shorter than a length (9b) in the width direction. A pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and an exhaust or intake pump driven from the valve drive section (3) through the rocker arm (2). with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an output portion on the other end side of the arm portion (5). (7) and an oil outflow boss (8),
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened in the center of the oil outflow surface (9), and a peripheral surface (8a). , a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input In the engine valve train configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the input section (6) side,
With the longitudinal direction of the arm (5) as the input/output direction and the axial direction of the pivot (1) as the width direction,
A valve gear for an engine, wherein an oil outflow surface (9) has a length (9a) in the input/output direction shorter than a length (9b) in the width direction. In the engine valve train according to any one of claims 1 to 5 ,
An engine valve train, characterized in that the oil outflow surface (9) is oriented along the horizontal direction during the fully closed period (4a) (4b) of the valve (4). A pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and an exhaust or intake pump driven from the valve drive section (3) through the rocker arm (2). with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an output portion on the other end side of the arm portion (5). (7) and an oil outflow boss (8),
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened in the center of the oil outflow surface (9), and a peripheral surface (8a). , a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input In the engine valve train configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the input section (6) side,
An engine valve train, characterized in that the oil outflow surface (9) is oriented along the horizontal direction during the fully closed period (4a) (4b) of the valve (4). In the engine valve train according to any one of claims 1 to 7 ,
The rocker arm (2) has an input side guide surface (16) that guides the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5) to the input section (6). ,
An engine valve train characterized in that an input part side guide surface (16) is inclined downward toward an input part (6) during a fully closed period (4a) (4b) of a valve (4). In the engine valve train according to any one of claims 1 to 7 ,
The rocker arm (2) has an output section side guide surface (17) that guides the engine oil (13) that has flowed down from the oil outflow boss section (8) onto the top surface of the arm section (5) to the output section (7). ,
An engine valve train characterized in that an output part side guide surface (17) is inclined downward toward an output part (7) during a fully closed period (4a) (4b) of a valve (4). In the engine valve train according to claim 8 ,
The rocker arm (2) has an output section side guide surface (17) that guides the engine oil (13) that has flowed down from the oil outflow boss section (8) onto the top surface of the arm section (5) to the output section (7). ,
An engine valve train characterized in that an output part side guide surface (17) is inclined downward toward an output part (7) during a fully closed period (4a) (4b) of a valve (4). In the engine valve train according to claim 10 ,
During the fully closed periods (4a) and (4b) of the valve (4), the downward inclination angle (16a) of the input side guide surface (16) is greater than the downward inclination angle (17a) of the output side guide surface (17). An engine valve train, characterized in that it is constructed to be large. In the engine valve train according to claim 11 ,
During the fully closed periods (4a) and (4b) of the valve (4), the downward inclination angle (16a) of the input side guide surface (16) is 2 of the downward inclination angle (17a) of the output side guide surface (17). A valve gear for an engine, characterized in that it is set to double to six times. A pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and an exhaust or intake pump driven from the valve drive section (3) through the rocker arm (2). with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an output portion on the other end side of the arm portion (5). (7) and an oil outflow boss (8),
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened in the center of the oil outflow surface (9), and a peripheral surface (8a). , a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input In the engine valve train configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the input section (6) side,
The rocker arm (2) has an input side guide surface (16) that guides the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5) to the input section (6). ,
During the fully closed periods (4a) and (4b) of the valve (4), the input section side guide surface (16) is inclined downward toward the input section (6),
The rocker arm (2) has an output section side guide surface (17) that guides the engine oil (13) that has flowed down from the oil outflow boss section (8) onto the top surface of the arm section (5) to the output section (7). ,
During the fully closed periods (4a) and (4b) of the valve (4), the output section side guide surface (17) is inclined downward toward the output section (7),
During the fully closed periods (4a) and (4b) of the valve (4), the downward inclination angle (16a) of the input side guide surface (16) is greater than the downward inclination angle (17a) of the output side guide surface (17). configured to be large,
During the fully closed periods (4a) and (4b) of the valve (4), the downward inclination angle (16a) of the input side guide surface (16) is 2 of the downward inclination angle (17a) of the output side guide surface (17). A valve gear for an engine, characterized in that it is set to double to six times. In the engine valve train according to any one of claims 1 to 13 ,
An engine characterized in that during the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in a downwardly sloping direction towards the input (6). Valve train. In the engine valve train according to any one of claims 1 to 14 ,
An engine valve train characterized in that an oil outflow hole (10) is inclined upward toward an input part (6) during a fully closed period (4a) (4b) of a valve (4). In the engine valve train according to any one of claims 1 to 15 ,
The rocker arm (2) has an input side guide surface (16) that guides the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5) to the input section (6). ,
With the axial direction of the pivot (1) as the width direction, both width direction edges (16b) (16b) of the input section side guide surface (16) located at both ends in the width direction of the arm section (5) A valve gear for an engine, characterized in that it is widened from (6) toward the oil outflow boss (8) side. A pivot (1), a rocker arm (2) pivotally supported on the pivot (1), a valve drive section (3), and an exhaust or intake pump driven from the valve drive section (3) through the rocker arm (2). with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented to intersect the pivot (1), an input portion (6) on one end side of the arm portion (5), and an output portion on the other end side of the arm portion (5). (7) and an oil outflow boss (8),
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened in the center of the oil outflow surface (9), and a peripheral surface (8a). , a boundary edge (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a),
The boundary edge portion (11) has an input portion side edge portion (12) on the input portion (6) side, and the engine oil (13) overflowing from the oil outflow hole (10) onto the oil outflow surface (9) flows into the input In the engine valve train configured to flow down from the side edge (12) and be supplied to the valve drive section (3) on the input section (6) side,
The rocker arm (2) has an input side guide surface (16) that guides the engine oil (13) that has flowed down from the oil outflow boss (8) onto the upper surface of the arm (5) to the input section (6). ,
With the axial direction of the pivot (1) as the width direction, both width direction edges (16b) (16b) of the input section side guide surface (16) located at both ends in the width direction of the arm section (5) A valve gear for an engine, characterized in that it is widened from (6) toward the oil outflow boss (8) side. In the engine valve train according to any one of claims 1 to 17 ,
The oil supply path to the oil outflow hole (10) consists of a shaft center passage (22) provided in the center of the pivot (1) and a shaft peripheral wall (23) of the shaft (1) from the shaft center passage (22). Equipped with an axial peripheral wall hole (24) that penetrates and leads out,
An engine valve train characterized in that a shaft peripheral wall hole (24) and an oil outflow hole (10) are in direct communication during a fully closed period (4a) (4b) of a valve (4). In the engine valve train according to any one of claims 1 to 18 ,
A valve gear for an engine, wherein the rocker arm (2) is provided with an oil injection hole (25) for injecting engine oil (13) toward the valve drive section (3). In the engine valve train according to any one of claims 1 to 19 ,
The input part (6) of the rocker arm (2) is provided with an input bolt (26),
The valve drive unit (3) has a push rod (27), and the upper end of the push rod (27) has a concave bolt receiving surface (26a) for receiving the lower end (26a) of the input bolt (26). 27a),
A valve gear for an engine, wherein the bolt receiving surface (27a) is provided with an oil reservoir recess (27b) recessed in the inner bottom thereof. In the engine valve train according to any one of claims 1 to 20 ,
The input part (6) of the rocker arm (2) is provided with an input bolt (26),
The valve drive unit (3) has a push rod (27), and the upper end of the push rod (27) has a concave bolt receiving surface (26a) for receiving the lower end (26a) of the input bolt (26). 27a),
An engine valve train, characterized in that an oil reservoir space (27c) surrounding the bolt lower end (26a) is formed between the bolt receiving surface (27a) and the bolt lower end (26a). In the engine valve train according to any one of claims 1 to 21 ,
The valve drive (3) comprises a push rod (27) and a tappet (28),
The tappet (28) has a concavely curved rod receiving surface (28a) that receives the rod lower end (27d) of the projecting curved surface of the push rod (27),
A valve gear for an engine, wherein the rod receiving surface (28a) is provided with an oil reservoir recess (28b) recessed in the inner bottom thereof.

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