WO2021019846A1

WO2021019846A1 - Valve gear of engine

Info

Publication number: WO2021019846A1
Application number: PCT/JP2020/016418
Authority: WO
Inventors: 真琴山内; 諭長谷川; 佑樹平河; 翔太郎是永; 信裕山本
Original assignee: 株式会社クボタ
Priority date: 2019-07-30
Filing date: 2020-04-14
Publication date: 2021-02-04
Also published as: JP7232148B2; CN113811672A; JP2021021386A

Abstract

Provided is a valve gear which is for an engine and in which the lubricity of a valve driving part increases. A rocker arm 2 is provided with: an arm part 5 oriented so as to intersect with a pivot 1; an input part 6 on one end side of the arm part 5; an output part 7 on the other end side of the arm part 5; and a boss part 8 for oil outflow. The boss part 8 for oil outflow is provided with: an oil outflow surface 9 formed on an upper surface; an oil outflow hole 10 open in a central area of the oil outflow surface 9; 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 11 is provided with an input part-side edge 12 on the input part 6 side and is configured so that engine oil 13 overflowed from the oil outflow hole 10 to the oil outflow surface 9 flows down from the input part-side edge 12 so as to be supplied to a valve driving part 3 on the input part 6 side.

Description

Engine valve gear

The present invention relates to an engine valve gear, and more particularly to an engine valve gear that enhances the lubricity of a valve drive unit.

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

Japanese Unexamined Patent Publication No. 7-150921 (see FIGS. 3 and 4)

<< Problem >> The lubricity of the valve drive unit may deteriorate.
In the valve gear, the engine oil that has flowed out from the oil outflow hole (110) to the oil outflow surface (109) flows down from the side edge portions (114) (114) by its own weight, so that it easily flows to both side sides. It is difficult to flow to the input / output portions (112a) and (115a) due to the flow resistance received from the upper surface of the arm portion (105). Further, the engine oil (113) is particularly difficult to flow to the input end portion (106) side that is lifted during the valve opening period of the valve (104). Therefore, it is difficult for the engine oil (113) to be supplied to the valve drive portion (103) on the input end portion (106) side, and the lubricity of the valve drive portion (103) may be lowered.

An object of the present invention is to provide an engine valve gear that improves the lubricity of a valve drive unit.

The configuration of the present invention is as follows.
As illustrated in FIG. 1 (C), the pivot (1), the rocker arm (2) pivotally supported by the pivot (1), the valve drive unit (3), and the valve drive unit (3) to the rocker arm (2). ) Is provided with an exhaust or intake valve (4) driven via
As illustrated in FIG. 1 (B), the rocker arm (2) includes an arm portion (5) in a direction intersecting the pivot axis (1), an input portion (6) on one end side of the arm portion (5), and an arm. The output portion (7) on the other end side of the portion (5) and the oil outflow boss portion (8) are provided.
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 portion (11) formed at the boundary between the oil outflow surface (9) and the peripheral surface (8a) are provided.
The boundary edge portion (11) includes an input portion side edge portion (12) on the input portion (6) side, and engine oil (13) overflowing from the oil outflow hole (10) to the oil outflow surface (9) is input. The engine is characterized in that it is configured to flow down from the side edge portion (12) and be supplied to the valve drive portion (3) on the input portion (6) side illustrated in FIG. 1 (C). Valve gear.

The invention of the present application has the following effects.
<< Effect >> The lubricity of the valve drive unit (3) is improved.
In this valve gear, the engine oil (13) that has flowed out from the oil outflow hole (10) illustrated in FIG. 1 (A) to the oil outflow surface (9) flows down from the input portion side edge portion (12) by its own weight. , It is easy to flow to the input unit (6) side, and the engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input unit (6) side illustrated in FIG. 1 (C), and the valve drive unit (3) The lubricity of the engine is increased.

FIG. 1A is an enlarged plan view of a main part of a rocker arm, FIG. 1B is a plan view of the rocker arm, and FIG. 1C is a view for explaining a basic example of an engine valve gear according to an embodiment of the present invention. ) Is a side view of the rocker arm and its surroundings. It is a vertical sectional front view of a cylinder head and its surroundings provided with a basic example of a valve gear. FIG. 2A shows a valve in a fully open state, and FIG. 2B shows a valve in a fully closed state. There is. In the figure explaining the valve opening / closing timing of the basic example of the valve gear, FIG. 3A shows the valve opening period, FIG. 3B shows the opening / closing period of the exhaust valve, and FIG. 3C shows the opening / closing period of the intake valve. Shown. It is a top view of the cylinder head provided with the basic example of a valve gear. It is a vertical sectional side view of the cylinder head of FIG. 4 and its periphery. It is a figure corresponding to FIG. 1 (C) of the modification 1 of the valve gear. FIG. 7A is a view corresponding to FIG. 1C, and FIG. 7B is an enlarged view of an oil outflow boss portion, which is a diagram for explaining a modified example 2 of the valve gear. It is a figure corresponding to FIG. 1 (C) of the modification 3 of the valve gear. 9 (A) is a diagram corresponding to FIG. 1 (B), and FIG. 9 (B) is a diagram corresponding to FIG. 1 (C), which is a diagram for explaining a modified example 4 of the valve gear. It is a figure corresponding to FIG. 1 (C) of the modification 5 of the valve gear. It is a figure corresponding to FIG. 1 (C) of the modification 6 of the valve gear. In the figure explaining the bush rod, FIG. 12A is a basic example, and FIG. 12B is a modification 7. In the figure explaining the tappet, FIG. 13A is a basic example, and FIG. 13B is a modification 8. FIG. 14 (A) is a plan view of the rocker arm, FIG. 14 (B) is a sectional view taken along line BB of FIG. 14 (A), and FIG. 14 (C) is a view for explaining a modified example 9 of the valve gear. 14 (A) is a sectional view taken along line CC. 15 (A) is a side view, and FIG. 15 (B) is a sectional view taken along line BB of FIG. 15 (A), which is a diagram for explaining an engine valve gear according to a prior art document.

1 to 14 are views for explaining the valve gear of the engine according to the embodiment of the present invention, FIGS. 1 to 5 are basic examples of the valve gear, and FIGS. 6 to 14 are modified examples 1 of the valve gear. ~ 9 is shown. In this embodiment, a vertical 4-cycle in-line multi-cylinder diesel engine including an overhead valve type valve gear will be described.

As shown in FIGS. 2A and 2B, the engine provided with the valve gear includes a cylinder block (29), a cylinder head (30) assembled on the upper part of the cylinder block (29), and a cylinder head ( A head cover (31) assembled to the upper part of the 30) is provided.

First, a basic example of the valve gear shown in FIGS. 1 to 5 will be described.
As shown in FIG. 1 (C), the valve gear includes a pivot (1), a rocker arm (2) pivotally supported by the pivot (1), a valve drive unit (3), and a valve drive unit (3). It is equipped with a valve (4) driven via a rocker arm (2).

As shown in FIGS. 2A and 2B, the valve drive unit (3) has a valve cam shaft (32) and a tappet (28) on the valve cam (32a) of the valve cam shaft (32). And a push rod (27) between the tappet (28) and the rocker arm (2).
The valve (4) shown in FIGS. 2A and 2B 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) is brought into contact with the output portion (7) of the rocker arm (2). A spring receiver (34) is attached to the valve (4), a compressed valve spring (35) is arranged between the spring receiver (34) and the cylinder head (30), and the valve (4) is a valve spring (35). ) Is urged in the upward valve closing direction by the elastic restoring force.
As shown in FIG. 4, the rocker arm (2), the push rod (27) and the tappet (28) shown in FIG. 5 correspond to the three pairs of valves (4) having the exhaust valve and the intake valve as a pair. And, three pairs of valve cams (32a) are provided.
The three pairs of rocker arms (2) are pivotally supported by pivots (1) erected on three rocker arm brackets (36) on the cylinder head (30).

As shown in FIG. 1 (B), the rocker arm (2) has an arm portion (5) in a direction intersecting the pivot axis (1), an input portion (6) on one end side of the arm portion (5), and an arm portion. It is provided with an output portion (7) on the other end side of (5) and an oil outflow boss portion (8).

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

In this valve gear, the engine oil (13) that has flowed out from the oil outflow hole (10) shown in FIG. 1A to the oil outflow surface (9) flows down from the input portion side edge portion (12) by its own weight. It is easy to flow to the input unit (6) side, and the engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input unit (6) side shown in FIG. 1 (C) to lubricate the valve drive unit (3). The sex becomes high.

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

As shown in FIG. 1 (A), the boundary edge portion (11) includes lateral edge portions (14) (14) in the axial length direction of the pivot axis (1).
The input section side flow path (12a) from the oil outflow hole (10) to the input section side edge portion (12) is the side flow path from the oil outflow hole (10) to the side side edge portions (14) (14). (14a) It is configured to be shorter than (14a).

In this valve gear, the engine oil (13) that has flowed out from the oil outflow hole (10) shown in FIG. 1 (A) to the oil outflow surface (9) is less susceptible to flow resistance than the side flow path (14a). Since a large amount of oil flows to the input unit (6) side through the input unit side flow path (12a), the engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input unit (6) side shown in FIG. 1 (C). It is supplied and the lubricity of the valve drive unit (3) is improved.

As shown in FIG. 1 (A), the output section side flow path (15a) from the oil outflow hole (10) to the output section side edge portion (15) is formed from the oil outflow hole (10) to the side edge portion (14). ) (14), it is configured to be shorter than the side flow paths (14a) and (14a).

In this valve gear, the engine oil (13) that has flowed out from the oil outflow hole (10) shown in FIG. 1 (A) to the oil outflow surface (9) is less susceptible to flow resistance than the side flow path (14a). Since a large amount of oil flows to the output unit (7) side via the output unit side flow path (15a), the engine oil (13) is sufficiently supplied to the valve (4) on the output unit (7) side shown in FIG. 1 (C). , The lubricity of the valve (4) is improved.

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

In this valve operating device, the engine oil (13) that has flowed out from the oil outflow hole (10) shown in FIG. 1A to the oil outflow surface (9) flows more than the flow paths (14a) and (14a) on both sides. Since a large amount of oil flows to the input / output units (6) (7) side via the input / output unit side flow paths (12a) (15a) that are less susceptible to resistance, the input / output units (6) (7) side shown in FIG. 1 (C). The engine oil (13) is sufficiently supplied to the valve drive unit (3) and the valve (4), and the lubricity of the valve drive unit (3) and the valve (4) is improved.

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

During the fully closed period (4a) (4b) shown in FIGS. 3B and 3C of the valve (4), the oil outflow surface (9) is oriented in the horizontal direction as shown in FIG. 1C. It is oriented.

In this valve operating device, the engine oil (13) that has flowed out from the oil outflow hole (10) shown in FIG. 1 (A) to the oil outflow surface (9) is shown in FIGS. 3 (B) and (C) of the valve (4). During the relatively long fully closed period (4a) (4b) shown, the oil flows down from the input / output unit side edges (12) (15) shown in FIG. 1 (C) by its own weight, so that the input / output units (6) and (7) sides The engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input / output unit (6) (7) side and the valve (4) on the output unit (7) side, and the valve drive unit (3) ) And the valve (4) have higher lubricity.

The fully closed periods (4a) and (4b) of the valve (4) shown in FIGS. 3B and 3C are set as follows.
As shown in FIG. 3A, the valve opening period of the exhaust valve is set to 230 ° at the crank angle while the crankshaft makes two rotations in one combustion cycle, and the valve opening period of the intake valve is set at the crank angle. It is set to 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 valve opening period 230 ° of the exhaust valve from 720 ° in which the crankshaft rotates twice. ..
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 valve opening period 228 ° of the intake valve from 720 ° in which the crankshaft rotates twice.

As shown in FIGS. 1A and 1C, the rocker arm (2) inputs the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6). It is provided with a guide surface (16) on the input unit side for guiding to.
During the fully closed period (4a) (4b) shown in FIGS. 3 (B) and 3 (C) of the valve (4), as shown in FIG. 1 (C), the input unit side guide surface (16) is the input unit (6). It is sloping down toward.

In this valve gear, the engine oil (13) that has flowed down to the upper surface of the arm portion (5) shown in FIGS. 1A and 1C is compared with those shown in FIGS. 3B and 3C of the valve (4). During the long fully closed period (4a) and (4b), the oil flows to the input unit (6) side along the downwardly inclined input unit side guide surface (16) shown in FIG. 1 (C), so that the input unit (6) side The engine oil (13) is sufficiently supplied to the valve drive unit (3), and the lubricity of the valve drive unit (3) is improved.

As shown in FIGS. 1A and 1C, the rocker arm (2) outputs the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5). It is provided with an output unit side guide surface (17) for guiding to.
During the fully closed period (4a) (4b) shown in FIGS. 3 (B) and 3 (C) of the valve (4), as shown in FIG. 1 (C), the output unit side guide surface (17) is the output unit (7). It is sloping down toward.

In this valve gear, the engine oil (13) that has flowed down to the upper surface of the arm portion (5) shown in FIGS. 1A and 1C is compared with those shown in FIGS. 3B and 3C of the valve (4). During the long fully closed period (4a) (4b), the oil flows to the output unit (7) side along the downwardly inclined output unit side guide surface (17) shown in FIG. 1 (C), so that the output unit (7) side The engine oil (13) is sufficiently supplied to the valve (4), and the lubricity of the valve (4) is improved.

During the fully closed period (4a) (4b) shown in FIGS. 3 (B) and 3 (C) of the valve (4), as shown in FIG. 1 (C), the downward inclination angle (16a) of the input portion side guide surface (16) ) Is configured to be larger than the downward inclination angle (17a) of the output unit side guide surface (17).

In this valve gear, the engine oil (13) that has flowed down to the upper surface of the arm portion (5) shown in FIGS. 1A and 1C is compared with those shown in FIGS. 3B and 3C of the valve (4). During the long fully closed period (4a) (4b), the downward inclination angle (16a) shown in FIG. 1C is large, and the oil flows to the input unit (6) side along the input unit side guide surface (16). The engine oil (13) is sufficiently supplied to the valve drive portion (3) on the portion (6) side, and the lubricity of the valve drive portion (3) is improved.

During the fully closed period (4a) (4b) shown in FIGS. 3 (B) and 3 (C) of the valve (4), as shown in FIG. 1 (C), the downward inclination angle (16a) of the input portion side guide surface (16) ) Is four times the downward inclination angle (17a) of the output unit 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 can be 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 unit (6) side and the output unit (7) side is lost, and in the former The input unit (6) side may be in short supply, and the output unit (7) side may be in short supply in the latter case, whereas in the case of 2 to 6 times, the supply balance is good and the valve drive unit (3) And the valve (4) is lubricated without excess or deficiency.
When the value is 3 to 5 times, a good supply balance is more reliably obtained, and when the value is 4 times, the best supply balance is obtained.

The downward inclination angle (16a) of the input unit side guide surface (16) and the downward inclination angle (17a) of the output unit side guide surface (17) shown in FIG. 1 (C) were measured as follows.
As shown in FIG. 1 (C), the horizontal virtual line passing through the apex that is the boundary between the input unit side guide surface (16) and the output unit side guide surface (17) is set as the reference line (40), and the reference line is relative to this reference line. The dip angles of the input / output unit side guide surfaces (16) and (17) were measured as these downward inclination angles (16a) and (17a).
Since the output unit side guide surface (17) shown in FIG. 1C is a flat surface without undulations, the downward inclination angle (17a) is 7 ° regardless of the measurement location.
The guide surface (16) on the input portion side shown in FIG. 1 (C) is an S-shaped curved surface with gentle undulations, and the tangential dip angles differ depending on the measurement points. Therefore, the tangent dip angles at a plurality of measurement points are measured. When the average value is calculated, the downward inclination angle (16a) is 28 °.
The downward inclination angle (16a) of the input unit side guide surface (16) is four times the downward inclination angle (17a) of the output unit side guide surface (17).

The configuration and effects of the basic example of the valve gear are as described above.
Next, modifications 1 to 9 of the valve gear shown in FIGS. 6 to 14 will be described.
These modified examples 1 to 9 have the same configuration as the basic example except for the structure peculiar to the modified examples described below. In FIGS. 6 to 14, the same elements as those in the basic example are designated by the same reference numerals as those in the basic example. Further, in these modified examples 1 to 9, as long as there is no structural contradiction, mutually unique structures can be used in combination.

In the modified example 1 shown in FIG. 6, the downward inclination angle (16a) of the input unit side guide surface (16) and the downward inclination angle (17a) of the output unit side guide surface (17) are larger than those of the basic example. Is.
Since the output unit 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 location.
Since the input portion 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 location.
The downward inclination angle (16a) of the input unit side guide surface (16) is four times the downward inclination angle (17a) of the output unit 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 period (4a) (4b) of the valve (4) shown in FIGS. 3 (B) and 3 (C). Although oriented in the direction, the modified example 2 shown in FIGS. 7 (A) and 7 (B) is shown in the fully closed period (4a) (4b) shown in FIGS. 3 (B) and 3 (C) of the valve (4). As shown in FIGS. 7A and 7B, the oil outflow surface (9) is oriented so as to incline downward toward the input portion (6).

In the valve gear of the second modification, the engine oil (13) that has flowed out from the oil outflow hole (10) shown in FIG. 7 (A) to the oil outflow surface (9) is in FIG. 3 (B) of the valve (4). During the relatively long fully closed period (4a) and (4b) shown in (C), as shown in FIG. 7 (A), the oil flows toward the input portion (6) along the downwardly inclined oil outflow surface (9). The engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input unit (6) side, and the lubricity of the valve drive unit (3) is improved.

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

When the downward inclination angle (9c) of the oil outflow surface (9) shown in FIGS. 7A and 7B is set to 5 ° to 25 °, the following effects can be obtained.
If it is less than 5 ° or exceeds 25 °, the supply balance of the engine oil (13) to the input unit (6) side and the output unit (7) side is lost, and in the former, the input unit (6) ) Side may be insufficiently supplied, and in the latter case, the output unit (7) side may be insufficiently supplied, whereas in the case of 5 ° to 25 °, the supply balance is good, and the valve driving unit (3) and the valve (4) ) Is lubricated without excess or deficiency.
When set to 15 °, the best supply balance is obtained.

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

In the valve operating device of the third modification, the engine oil (13) that flows out from the oil outflow hole (10) shown in FIG. 8 to the oil outflow surface (9) overflows toward the input portion (6) side. The engine oil (13) on the oil outflow surface (9) easily flows to the input unit (6) side, and the engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input unit (6) side, so that the valve. The lubricity of the drive unit (3) is improved.

In the modified example 3 shown in FIG. 8, the oil outflow surface (9) is directed toward the input portion (6) during the fully closed period (4a) (4b) of the valve (4), as in the modified example 2 shown in FIG. It is oriented in the direction of downward inclination.
In the modified example 3 shown in FIG. 8, the oil outflow surface (9) is oriented in the horizontal direction during the fully closed period (4a) (4b) of the valve (4), as in the basic example shown in FIG. May be oriented to.

In the modified example 4 shown in FIGS. 9A and 9B, the rocker arm (2) has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) as in the basic example. ) Is provided on the input unit side guide surface (16) for guiding the input unit (6).
In the modified example 4 shown in FIGS. 9A and 9B, as shown in FIG. 9A, the positions are located at both ends of the arm portion (5) in the width direction with the axial length direction of the pivot axis (1) as the width direction. Both widthwise end edges (16b) (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 gear of the modified example 4, as shown in FIGS. 9A and 9B, the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) is Since it is received by the expanded input unit side guide surface (16) shown in FIG. 9 (A) and guided to the input unit (6) side, the engine is connected to the valve drive unit (3) on the input unit (6) side. The oil (13) is sufficiently supplied, and the lubricity of the valve drive unit (3) is improved.

In the basic example of the rocker arm (2) shown in FIG. 2 (C), the oil supply path to the oil outflow hole (10) is the shaft center passage (22) provided at the center of the pivot (1) and the shaft center. It is provided with an axial wall hole (24) derived from the passage (22) through the axial peripheral wall (23) of the pivot (1), but the axial peripheral wall hole (24) is only a horizontal pair, and FIG. (B) During the fully closed period (4a) (4b) of the valve (4) shown in (C), the shaft peripheral wall hole (24) and the oil outflow hole (10) do not directly communicate with each other.
In the modified example 5 shown in FIG. 10, during the fully closed periods (4a) and (4b) shown in FIGS. 3 (B) and 3 (C) of the valve (4), as shown in FIG. 10, the shaft peripheral wall hole (24) and the oil The outflow hole (10) communicates directly. That is, the shaft 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 shaft peripheral wall hole (24) and the oil outflow hole (10) face each other. The shaft peripheral wall hole (24) and the oil outflow hole (10) directly communicate with each other without passing through the fitting gap (1a) between the pivot (1) and the rocker arm (2).

In the valve gear of the modified example 5, the engine oil (13) is introduced from the shaft center passage (22) to the shaft peripheral wall hole (22) during the fully closed period (4a) (4b) of the relatively long valve (4). Since the oil flows out to the oil outflow surface (9) through the oil outflow hole (10) that directly communicates with 24), the engine oil (13) is sufficiently supplied to the input / output units (6) and (7), and the input / output unit is sufficiently supplied. (6) The lubricity of the valve drive unit (3) and the valve (4) on the (7) side is improved.

The pivot (1) shown in FIG. 10 includes a pair of horizontal left and right shaft holes and a pair of vertical vertical shaft peripheral wall holes (24), and has a vertical upper shaft peripheral wall hole (24) and an oil outflow hole (10). Communicate directly.

In the modified example 6 shown in FIG. 11, the rocker arm (2) is provided with an oil injection hole (25) for injecting engine oil (13) toward the valve drive unit (3).

In the valve gear of the modified example 6, the engine oil (13) is injected from the oil injection hole (25) shown in FIG. 11 toward the valve drive unit (3), so that the engine oil is injected into the valve drive unit (3). (13) is sufficiently supplied, and the lubricity of the valve drive unit (3) is improved.

In the basic example of the valve gear, as shown in FIG. 12A, the input portion (6) of the rocker arm (2) is provided with an input bolt (26), and the valve drive portion (3) is a push rod (27). The push rod (27) is provided with a concave curved bolt receiving surface (27a) at the upper end for receiving the protruding bolt lower end (26a) of the input bolt (26), and the bolt receiving surface (27a) is provided. , It is provided with an oil reservoir recess (27b) recessed in the inner bottom thereof.

In the valve operating device of this basic example, since the engine oil (13) is collected in the oil reservoir recess (27b) shown in FIG. 12A, the engine oil (13) is collected in the lower end of the bolt (26a) and the bolt receiving surface (27a). ) Is sufficiently supplied, and the lubricity of the lower end portion (26a) of the bolt and the receiving surface (27a) of the bolt is improved.

In the basic example shown in FIG. 12 (A), there is almost no gap between the bolt receiving surface (27a) and the bolt lower end portion (26a), but in the modified example 7 shown in FIG. 12 (B), the bolt receiving surface ( An oil reservoir space (27c) that surrounds the lower end of the bolt (26a) is formed between the lower end of the bolt (26a) and the lower end of the bolt (26a).

In the valve operating device of the modified example 7, the engine oil (13) is collected in the oil storage space (27c) shown in FIG. 12 (B), so that the engine oil (26a) and the bolt receiving surface (27a) are covered with the engine oil (13). 13) is sufficiently supplied, and the lubricity of the lower end portion (26a) of the bolt and the receiving surface (27a) of the bolt is improved.

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

In the valve operating device of the modified example 8, since the engine oil (13) is collected in the oil storage recess (28b) shown in FIG. 13 (B), the engine oil (26a) and the bolt receiving surface (27a) are covered with the engine oil (13). 13) is sufficiently supplied, and the lubricity of the lower end portion (26a) of the bolt and the receiving surface (27a) of the bolt is improved.

In the modified example 9 shown in FIGS. 14A to 14C, 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. An oil outflow hole (10) opened in the inner bottom surface (19) of (18) is provided.
The inner bottom surface (19) of the oil guide groove (18) includes an input unit side inner bottom surface (20) that guides the engine oil (13) that has flowed out from the oil outflow hole (10) to the input unit (6) side, and an output unit. It is provided with an inner bottom surface (21) on the output unit side that guides the (7) side.
During the fully closed period (4a) (4b) shown in FIGS. 3B and 3C of the valve (4), as shown in FIG. 14B, the downward inclination angle (20a) of the inner bottom surface (20) on the input portion side is shown. ) Is configured to be larger than the downward inclination angle (21a) of the inner bottom surface (21) on the output unit side.

In the valve operating device of the modified example 9, the engine oil (13) that has flowed out from the oil outflow holes (10) shown in FIGS. 14 (A) to 14 (C) into the oil guide groove (18) is the oil guide groove (18). Since the oil flows to the input / output units (6) (7) side by the guidance of the above, the engine oil (13) is sufficiently supplied to the valve drive units (3) and the valves (4) on the input / output units (6) (7) sides. , The lubricity of the valve drive unit (3) and the valve (4) is improved.

Further, in the valve gear of the modified example 9, the engine oil (13) that has flowed out from the oil outflow holes (10) shown in FIGS. 14 (A) to 14 (C) into the oil guide groove (18) is the valve (4). In the relatively long fully closed period (4a) (4b) shown in FIGS. 3 (B) and 3 (C), the input unit (6) side is passed through the input unit side inner bottom surface (20) having a large downward inclination angle (20a). The engine oil (13) is sufficiently supplied to the valve drive unit (3) on the input unit (6) side, and the lubricity of the valve drive unit (3) is improved.

The downward inclination angle (20a) of the inner bottom surface (20) on the input portion side of the modified example 9 shown in FIG. 14 (B) is the downward inclination angle (16) of the input portion side guide surface (16) of the basic example shown in FIG. 1 (C). The angle is the same as (16a), and the downward inclination angle (21a) of the inner bottom surface (21) on the output unit side of the modified example 9 shown in FIG. 14 (B) is the output unit side of the basic example shown in FIG. 1 (C). It is the same angle as the downward inclination angle (17a) of the guide surface (17).
Similar to the basic example shown in FIG. 1 (C), during the fully closed period (4a) (4b) shown in FIGS. 3 (B) (C) of the valve (4), the input unit is shown in FIG. 14 (B). The downward inclination angle (20a) of the inner bottom surface (20) on the side is four times the downward inclination angle (21a) of the inner bottom surface (21) on the output unit side. 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 section, (8) ... Oil outflow boss section, (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 side edge, (12a) ... input 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) ... down Tilt angle, (17) ... Output side guide surface, (17a) ... Downward tilt angle, (18) ... Oil guide groove, (19) ... Inner bottom surface, (20) ... Input section side inner bottom surface, (20a) ... Downward inclination angle, (21) ... Output side inner bottom surface, (21a) ... Downward inclination angle, (22) ... Axial center passage, (23) ... Axial peripheral wall, (24) ... Axial peripheral wall hole, (25) ... Oil Injection hole, (26) ... Input bolt, (26a) ... Bolt lower end, (27) ... Push rod, (27a) ... Bolt receiving surface, (27b) ... Oil reservoir recess, (27c) ... Oil reservoir space, (27a) ... 27d) ... Rod lower end, (28) ... Tappet, (28a) ... Rod receiving surface, (28b) ... Oil reservoir recess.

Claims

Exhaust or intake driven from the pivot (1), the rocker arm (2) pivotally supported by the pivot (1), the valve drive (3), and the valve drive (3) via the rocker arm (2). Equipped with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented so as 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 oil outflow boss (8) are provided.
The oil outflow boss portion (8) includes an oil outflow surface (9) formed on the upper surface, an oil outflow hole (10) opened at 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) includes an input portion side edge portion (12) on the input portion (6) side, and engine oil (13) overflowing from the oil outflow hole (10) to the oil outflow surface (9) is input. An engine valve gear characterized in that it is configured to flow down from a side edge portion (12) and be supplied to a valve drive portion (3) on the input portion (6) side.
In the valve gear of the engine according to claim 1.
The boundary edge (11) includes lateral edges (14) (14) in the axial length direction of the pivot (1).
The input section side flow path (12a) from the oil outflow hole (10) to the input section side edge portion (12) is the side flow path from the oil outflow hole (10) to the side side edge portions (14) (14). (14a) An engine valve gear that is configured to be shorter than (14a).
In the valve gear of the engine according to claim 1 or 2.
The boundary edge portion (11) includes an output portion side edge portion (15) on the output portion (7) side and side edge portions (14) (14) in the axial length direction of the pivot axis (1).
The output side flow path (15a) from the oil outflow hole (10) to the output part side edge (15) is the side flow path from the oil outflow hole (10) to the side edge (14) (14). (14a) An engine valve gear that is configured to be shorter than (14a).
In the valve gear of the engine according to any one of claims 1 to 3.
The longitudinal direction of the arm portion (5) is the input / output direction, and the axial length direction of the pivot axis (1) is the width direction.
The oil outflow surface (9) is an engine valve gear characterized in that the length (9a) in the input / output direction is shorter than the length (9b) in the width direction.
In the valve gear of the engine according to any one of claims 1 to 4.
An engine valve gear characterized in that during the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in a horizontal direction.
In the valve gear of the engine according to any one of claims 1 to 5.
The rocker arm (2) is provided with an input portion side guide surface (16) that guides the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6). ,
An engine valve gear characterized in that during the fully closed period (4a) (4b) of the valve (4), the input portion side guide surface (16) is inclined downward toward the input portion (6).
In the valve gear of the engine according to any one of claims 1 to 5.
The rocker arm (2) is provided with an output unit side guide surface (17) that guides the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the output unit (7). ,
An engine valve gear characterized in that during the fully closed period (4a) (4b) of the valve (4), the output unit side guide surface (17) is inclined downward toward the output unit (7).
In the valve gear of the engine according to claim 6.
The rocker arm (2) is provided with an output unit side guide surface (17) that guides the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the output unit (7). ,
An engine valve gear characterized in that during the fully closed period (4a) (4b) of the valve (4), the output unit side guide surface (17) is inclined downward toward the output unit (7).
In the valve gear of the engine according to claim 8.
During the fully closed period (4a) (4b) of the valve (4), the downward inclination angle (16a) of the input portion side guide surface (16) is larger than the downward inclination angle (17a) of the output portion side guide surface (17). An engine valve gear that is configured to be large.
In the valve gear of the engine according to claim 9.
During the fully closed period (4a) (4b) of the valve (4), the downward inclination angle (16a) of the input portion side guide surface (16) is 2 of the downward inclination angle (17a) of the output portion side guide surface (17). An engine valve gear characterized by being doubled to six times as large.
In the valve gear of the engine according to any one of claims 1 to 10.
During the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in a downwardly inclined direction toward the input portion (6). Valve gear.
In the valve gear of the engine according to any one of claims 1 to 11.
An engine valve gear characterized in that, during the fully closed period (4a) (4b) of the valve (4), the oil outflow hole (10) is inclined upward toward the input portion (6) side.
In the valve gear of the engine according to any one of claims 1 to 12.
The rocker arm (2) is provided with an input portion side guide surface (16) that guides the engine oil (13) that has flowed down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6). ,
Both widthwise edge edges (16b) (16b) of the input portion side guide surface (16) located at both ends of the arm portion (5) in the width direction with the axial length direction of the pivot axis (1) as the width direction are input portions. An engine valve gear that is widened from (6) toward the oil outflow boss portion (8).
Exhaust or intake driven from the pivot (1), the rocker arm (2) pivotally supported by the pivot (1), the valve drive (3), and the valve drive (3) via the rocker arm (2). Equipped with a valve (4) for
The rocker arm (2) has an arm portion (5) oriented so as to intersect the pivot axis (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), an oil guide groove (18) recessed along the longitudinal direction on the upper surface of the arm portion (5), and an oil outflow hole (19) opened in the inner bottom surface (19) of the oil guide groove (18). With 10)
The inner bottom surface (19) of the oil guide groove (18) includes an input unit side inner bottom surface (20) that guides the engine oil (13) that has flowed out from the oil outflow hole (10) to the input unit (6) side, and an output unit. It is equipped with an inner bottom surface (21) on the output unit side that guides to the (7) side.
During the fully closed period (4a) (4b) of the valve (4), the downward inclination angle (20a) of the inner bottom surface (20) on the input unit side is larger than the downward inclination angle (21a) of the inner bottom surface (21) on the output unit side. An engine valve gear that is configured to be large.
In the valve gear of the engine according to any one of claims 1 to 14.
The oil supply path to the oil outflow hole (10) includes a shaft center passage (22) provided at the center of the pivot (1) and a shaft peripheral wall (23) from the shaft center passage (22) to the pivot (1). It has an axial wall hole (24) that is derived through it.
An engine valve gear characterized in that the shaft peripheral wall hole (24) and the oil outflow hole (10) are in direct communication during the fully closed period (4a) (4b) of the valve (4).
In the valve gear of the engine according to any one of claims 1 to 15.
The rocker arm (2) is an engine valve gear characterized by having an oil injection hole (25) for injecting engine oil (13) toward a valve drive unit (3).
In the valve gear of the engine according to any one of claims 1 to 16.
The input section (6) of the rocker arm (2) is provided with an input bolt (26).
The valve drive unit (3) includes a push rod (27), and the push rod (27) has a concave curved bolt receiving surface (26a) that receives a convex bolt lower end (26a) of an input bolt (26) at the upper end. With 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 valve gear of the engine according to any one of claims 1 to 17.
The input section (6) of the rocker arm (2) is provided with an input bolt (26).
The valve drive unit (3) includes a push rod (27), and the push rod (27) has a concave curved bolt receiving surface (26a) that receives a convex bolt lower end (26a) of an input bolt (26) at the upper end. With 27a)
An engine valve gear characterized in that an oil reservoir space (27c) that surrounds the lower end portion (26a) of the bolt is formed between the bolt receiving surface (27a) and the lower end portion (26a) of the bolt.
In the valve gear of the engine according to any one of claims 1 to 18.
The valve drive unit (3) includes a push rod (27) and a tappet (28).
The tappet (28) is provided with a concave curved rod receiving surface (28a) that receives the rod lower end portion (27d) of the convex 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.