Engine valve train

Abstract

Provided is an engine valve transmission device that improves the lubricity of a valve drive unit. A rocker arm (2) includes an arm (5) in a direction intersecting a pivot (1), an input portion (6) on one end side of the arm (5), an output portion (7) on the other end side of the arm (5), and an oil outflow boss (8), wherein the oil outflow boss (8) includes an oil outflow surface (9) formed on an upper surface, an oil outflow hole (10) opened in the center 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), wherein the boundary edge (11) includes an input portion side edge (12) on the input portion (6) side, and engine oil (13) overflowing from the oil outflow hole (10) to the oil outflow surface (9) flows down from the input portion side edge (12) and is supplied to the valve drive unit (3) on the input portion (6) side.

Description

Technical Field

[0001] The present invention relates to a valve train for an engine, and more particularly to a valve train for an engine having improved lubricity of a valve drive portion. Background Art

[0002] In the past, Fig.15 As shown in (A), there is a valve transmission device of an engine (for example, refer to patent document 1) including a pivot (101), a rocker arm (102) rotatably supported by the pivot (101), a valve driving unit (103), and an exhaust or intake valve (104) driven from the valve driving unit (103) via the rocker arm (102).

[0003] like Fig.15 As shown in (B), in this valve transmission device, the rocker arm (102) includes an arm portion (105) and an oil outflow boss portion (108), the oil outflow boss portion (108) includes an oil outflow surface (109) formed on the upper surface, an oil outflow hole (110) opened in the central portion of the oil outflow surface (109), a peripheral surface (108a), and a boundary edge portion (111)(111) formed at the boundary between the oil outflow surface (109) and the peripheral surface (108a), the boundary edge portion (111)(111) is only composed of the axillary edge portions (114)(114) on both sides of the oil outflow surface (109), as shown in FIG. Fig.15 As shown in (A), the boundary edge (111) is not formed on the input / output side (112a) (115a) of the oil outflow surface (109), but the input / output side (112a) (115a) of the oil outflow surface (109) and the upper surface (105a) of the arm (105) form a single surface.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 7-150921 (refer to Figure 3 , 4 ) Summary of the invention

[0007] Problems to be solved by the invention

[0008] <Problem> There is a possibility that the lubricity of the valve drive part may decrease.

[0009] In the valve transmission device, the engine oil flowing out from the oil outflow hole (110) to the oil outflow surface (109) flows down from the side edge (114) (114) due to its own weight, and thus easily flows to both side arms, but it is difficult to flow to the input and output part side (112a) (115a) due to the flow resistance from the upper surface of the arm part (105). In addition, the engine oil (113) is particularly difficult to flow to the raised input end (106) side during the valve opening period of the valve (104). Therefore, the engine oil (113) is difficult to be supplied to the valve drive part (103) on the input end (106) side, and there is a possibility that the lubricity of the valve drive part (103) becomes low.

[0010] An object of the present invention is to provide a valve train for an engine having improved lubricity of a valve drive portion.

[0011] Means for solving problems

[0012] The structure of the present invention is as follows.

[0013] A valve transmission device for an engine, characterized in that: Figure 1 As shown in (C), it includes a pivot (1), a rocker arm (2) rotatably supported by the pivot (1), a valve driving unit (3), and an exhaust or intake valve (4) driven by the valve driving unit (3) via the rocker arm (2),

[0014] like Figure 1 As shown in (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), an output portion (7) on the other end side of the arm portion (5), and a boss portion (8) for oil outflow.

[0015] like Figure 1 As shown in (A), 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), 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).

[0016] The boundary edge portion (11) includes 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) to the oil outflow surface (9) flows down from the input portion side edge portion (12) and is supplied to Figure 1 (C) The valve driving section (3) on the input section (6) side shown.

[0017] Effects of the Invention

[0018] The present invention has the following effects.

[0019] <Effect> The lubricity of the valve drive unit (3) is improved.

[0020] In this valve transmission device, due to Figure 1 The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) flows down from the input portion side edge (12) due to its own weight, and thus easily flows to the input portion (6) side, and the engine oil (13) is sufficiently supplied to the Figure 1 (C) The valve driving portion (3) on the input portion (6) side is provided, thereby improving the lubricity of the valve driving portion (3). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 1 is a diagram for explaining a basic example of a valve train for an engine according to an embodiment of the present invention. Figure 1 (A) is an enlarged top view of the main part of the rocker arm. Figure 1 (B) is a top view of the rocker arm. Figure 1 (C) is a side view of the rocker arm and its surroundings.

[0022] Figure 2 This is a longitudinal sectional front view of a cylinder head and its surroundings of a basic example of a valve train. Figure 2 (A) is a diagram showing the fully open state of the valve. Figure 2 (B) is a diagram showing a fully closed state of the valve.

[0023] Figure 3 1 is a diagram for explaining the valve opening and closing timing of a basic example of a valve train. Figure 3 (A) shows the valve opening period, Figure 3 (B) shows the opening and closing period of the exhaust valve, Figure 3 (C) shows the opening and closing period of the intake valve.

[0024] Figure 4 It is a top view of a cylinder head including a basic example of a valve train.

[0025] Figure 5 yes Figure 4 A longitudinal sectional side view of a cylinder head and its surroundings.

[0026] Figure 6 The first modification of the valve train is equivalent to Figure 1 (C) Figure.

[0027] Figure 7 2 is a diagram for explaining a second modification of the valve train. Figure 7 (A) is equivalent to Figure 1 (C) Figure, Figure 7 (B) is an enlarged view of the boss portion for oil outflow.

[0028] Figure 8 The third modification of the valve train is equivalent to Figure 1 (C) Figure.

[0029] Fig. 9 1 is a diagram for explaining a fourth modification of the valve train. Fig. 9 (A) is equivalent to Figure 1 (B) Figure, Fig. 9 (B) is equivalent to Figure 1 (C) Figure.

[0030] Fig.10 The fifth modification of the valve train is equivalent to Figure 1 (C) Figure.

[0031] Fig.11 The modified example 6 of the valve train is equivalent to Figure 1 (C) Figure.

[0032] Fig.12 This is a diagram illustrating a putter. Fig.12 (A) is a diagram of a basic example. Fig.12 (B) is a diagram of modification example 7.

[0033] Fig.13 This is a diagram illustrating the tappet. Fig.13 (A) is a diagram of a basic example. Fig.13 (B) is a diagram of modification example 8.

[0034] Fig.14 1 is a diagram for explaining a modified example 9 of the valve train, Fig.14 (A) is a top view of the rocker arm. Fig.14 (B) Yes Fig.14 (A) BB line cross-sectional view, Fig.14 (C) Yes Fig.14 (A) CC line cross-sectional view.

[0035] Fig.15 1 is a diagram illustrating a valve train of an engine in a prior art document, Fig.15 (A) is a side view, Fig.15 (B) Yes Fig.15 (A) BB line cross-sectional view. DETAILED DESCRIPTION

[0036] Figure 1 to Figure 14 1 is a diagram for explaining a valve train of an engine according to an embodiment of the present invention. Figure 1 to Figure 5 This is a basic example of a valve train. Figure 6 to Figure 14 Modifications 1 to 9 of the valve train are shown. In this embodiment, a vertical four-stroke in-line multi-cylinder diesel engine equipped with an overhead valve type valve train is described.

[0037] like Figure 2As shown in (A) and (B), an engine equipped with a valve transmission device includes a cylinder block (29), a cylinder head (30) assembled on the upper part of the cylinder block (29), and a head cover (31) assembled on the upper part of the cylinder head (30).

[0038] First, explain Figure 1 to Figure 5 A basic example of a valve train is shown.

[0039] like Figure 1 As shown in (C), the valve transmission device includes a pivot (1), a rocker arm (2) rotatably supported by the pivot (1), a valve driving unit (3), and a valve (4) driven by the valve driving unit (3) via the rocker arm (2).

[0040] like Figure 2 As shown in (A) and (B), the valve drive unit (3) includes a valve camshaft (32), a tappet (28) on a valve cam (32a) of the valve camshaft (32), and a push rod (27) between the tappet (28) and the rocker arm (2).

[0041] Figure 2 The valve (4) shown in (A) and (B) is an exhaust valve. The intake valve is also driven by the same mechanism as the exhaust valve. A valve cover (33) is installed at the upper end of the valve (4), and the valve cover (33) abuts against the output portion (7) of the rocker arm (2). A spring seat (34) is installed on the valve (4), and a compressed valve spring (35) is arranged between the spring seat (34) and the cylinder head (30). The valve (4) is urged in the upward valve closing direction by the elastic restoring force of the valve spring (35).

[0042] like Figure 4 As shown, corresponding to the three pairs of exhaust valves and intake valves (4), the rocker arm (2), Figure 5 The push rods (27), tappets (28) and valve cams (32a) shown are provided in three pairs.

[0043] Three pairs of rocker arms (2) are rotatably supported by a pivot (1), wherein the pivot (1) is mounted on three rocker arm brackets (36) on a cylinder head (30).

[0044] like Figure 1 As shown in (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), an output portion (7) on the other end side of the arm portion (5), and a boss portion (8) for oil outflow.

[0045] like Figure 1As shown in (A), 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 central portion of the oil outflow surface (9), 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).

[0046] The boundary edge portion (11) includes 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) to the oil outflow surface (9) flows down from the input portion side edge portion (12) and is supplied to Figure 1 (C) The valve driving section (3) on the input section (6) side shown.

[0047] In the valve transmission device, Figure 1 The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) flows down from the input portion side edge (12) due to its own weight, and thus easily flows toward the input portion (6), and the engine oil (13) is sufficiently supplied to the input portion (6). Figure 1 (C) The valve driving portion (3) on the input portion (6) side shown in FIG. 1 can improve the lubricity of the valve driving portion (3).

[0048] like Figure 5 As shown, the oil supply path includes an oil filter (38) immersed in the engine oil (13) of the oil pan (37), an oil pump (39) connected to the outlet side of the oil filter (38), an oil passage (42) connected to the discharge side of the oil pump (39), an axial center passage (22) of the pivot (1) connected to the outlet side of the oil passage (42), a axial wall hole (24) that penetrates the axial wall (23) of the pivot (1) from the axial center passage (22) to conduct the oil discharge, and a fitting gap (1a) between the pivot (1) and the rocker arm (2).

[0049] The engine oil (13) in the oil pan (37) passes through the oil supply path in the above-mentioned order and is supplied to the oil outflow hole (10) of the rocker arm (2).

[0050] like Figure 1 As shown in (A), the boundary edge portion (11) includes an axillary edge portion (14) (14) located in the axial length direction of the pivot (1).

[0051] An input portion side flow path (12a) from the oil outflow hole (10) to the input portion side edge (12) is configured to be shorter than an axillary side flow path (14a)(14a) from the oil outflow hole (10) to the axillary side edge (14)(14).

[0052] In the valve transmission device, Figure 1The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) flows in large quantities toward the input portion (6) side through the input portion side flow path (12a) which is less susceptible to flow resistance than the axilla side flow path (14a), so that the engine oil (13) is sufficiently supplied to the Figure 1 (C) The valve driving portion (3) on the input portion (6) side is provided, thereby improving the lubricity of the valve driving portion (3).

[0053] like Figure 1 As shown in (A), the output side flow path (15a) from the oil outflow hole (10) to the output side edge (15) is configured to be shorter than the axillary side flow path (14a)(14a) from the oil outflow hole (10) to the axillary side edge (14)(14).

[0054] In the valve transmission device, Figure 1 The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) flows in large quantities toward the output portion (7) side through the output portion side flow path (15a) which is less susceptible to flow resistance than the axilla side flow path (14a), so that the engine oil (13) is sufficiently supplied to the output portion (7). Figure 1 (C) The valve (4) on the output portion (7) side is provided, thereby improving the lubricity of the valve (4).

[0055] like Figure 1 As shown in (A), the length direction of the arm (5) is taken as the input / output direction, and the axial length direction of the pivot (1) is taken as the width direction, and the oil outflow surface (9) has a shape in which the length (9a) in the input / output direction is shorter than the length (9b) in the width direction.

[0056] In the valve transmission device, Figure 1 The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) flows in large quantities to the input / output part (6) (7) via the input / output part side flow path (12a) (15a) which is less susceptible to flow resistance than the two side flow paths (14a) (14a), so that the engine oil (13) is sufficiently supplied to the input / output part (6) (7). Figure 1 The valve driving part (3) and the valve (4) on the input / output part (6) (7) side shown in (C) are provided, thereby improving the lubricity of the valve driving part (3) and the valve (4).

[0057] like Figure 1 As shown in (A), the oil outflow surface (9) is formed in an oval shape that is long in the width direction in a plan view. The oil outflow surface (9) may also be an ellipse or a rectangle that is long in the width direction in a plan view.

[0058] At the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 1As shown in (C), the oil outflow surface (9) is oriented in the horizontal direction.

[0059] In the valve transmission device, Figure 1 The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) is located at the valve (4). Figure 3 During the long fully closed period (4a) (4b) shown in (B) and (C), the deadweight Figure 1 Since the oil flows down the side edge portion (12) (15) of the input / output portion shown in (C), it easily flows toward the input / output portion (6) (7) side, and the engine oil (13) is sufficiently supplied to the valve drive portion (3) and the valve (4) on the input / output portion (6) (7) side, thereby improving the lubricity of the valve drive portion (3) and the valve (4).

[0060] Figure 3 The fully closed periods (4a) and (4b) of the valve (4) shown in (B) and (C) are set as follows.

[0061] like Figure 3 As shown in (A), during two crankshaft rotations in one combustion cycle, the exhaust valve opening period is set to 230° in crank angle, and the intake valve opening period is set to 228° in crank angle.

[0062] Therefore, if Figure 3 As shown in (B), the exhaust valve fully closed period (4a) is set to 490° obtained by subtracting the exhaust valve open period 230° from 720° of the crankshaft rotating twice.

[0063] In addition, if Figure 3 As shown in (C), the full closing period (4b) of the intake valve is set to 492° obtained by subtracting the opening period 228° of the intake valve from 720° of the crankshaft rotating twice.

[0064] like Figure 1 As shown in (A) and (C), the rocker arm (2) includes an input portion side guide surface (16) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6).

[0065] At the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 1 As shown in (C), the input portion side guide surface (16) is inclined downward toward the input portion (6).

[0066] In the valve train, the flow down to Figure 1 The engine oil (13) on the upper surface of the arm (5) shown in (A) and (C) is Figure 3During the longer fully closed period (4a) (4b) shown in (B) and (C), along Figure 1 The downwardly inclined input portion side guide surface (16) shown in (C) flows toward the input portion (6) side, so that the engine oil (13) is sufficiently supplied to the valve drive portion (3) on the input portion (6) side, thereby improving the lubricity of the valve drive portion (3).

[0067] like Figure 1 As shown in (A) and (C), the rocker arm (2) includes an output portion side guide surface (17) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the output portion (7).

[0068] At the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 1 As shown in (C), the output portion side guide surface (17) is inclined downward toward the output portion (7).

[0069] In the valve train, the flow down to Figure 1 The engine oil (13) on the upper surface of the arm (5) shown in (A) and (C) is Figure 3 During the longer fully closed period (4a) (4b) shown in (B) and (C), along Figure 1 The downwardly inclined output portion side guide surface (17) shown in (C) flows toward the output portion (7) side, so that the engine oil (13) is sufficiently supplied to the valve (4) on the output portion (7) side, thereby improving the lubricity of the valve (4).

[0070] At the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 1 As shown in (C), the downward inclination angle (16a) of the guide surface (16) on the input side is configured to be larger than the downward inclination angle (17a) of the guide surface (17) on the output side.

[0071] In the valve train, the flow down to Figure 1 The engine oil (13) on the upper surface of the arm (5) shown in (A) and (C) is Figure 3 During the longer fully closed period (4a) (4b) shown in (B) and (C), along Figure 1 The input portion side guide surface (16) having a large downward inclination angle (16a) shown in (C) flows toward the input portion (6) side, so that the engine oil (13) is sufficiently supplied to the valve drive portion (3) on the input portion (6) side, thereby improving the lubricity of the valve drive portion (3).

[0072] At the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 1 As shown in (C), the downward inclination angle (16a) of the input side guide surface (16) is 4 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.

[0073] When the above value is set to 2 to 6 times, the following effects can be obtained.

[0074] When the value is less than 2 times, or when the value exceeds 6 times, the supply of the engine oil (13) to the input portion (6) side and the output portion (7) side becomes unbalanced. In the former case, there is a possibility of insufficient supply on the input portion (6) side, and in the latter case, there is a possibility of insufficient supply on the output portion (7) side. In contrast, in the case of 2 to 6 times, the supply balance is good, and the valve drive portion (3) and the valve (4) will not be over- or under-lubricated.

[0075] When the value is 3 to 5 times, a good supply balance can be obtained more reliably, and when the value is 4 times, the best supply balance can be obtained.

[0076] Figure 1 The downward inclination angle (16a) of the input portion side guide surface (16) and the downward inclination angle (17a) of the output portion side guide surface (17) shown in (C) are measured as follows.

[0077] like Figure 1 As shown in (C), a horizontal imaginary line passing through the vertices of the boundary between the input side guide surface (16) and the output side guide surface (17) is used as a reference line (40), and the inclination angles of the input and output side guide surfaces (16) (17) relative to the reference line are measured as these downward inclination angles (16a) (17a).

[0078] because Figure 1 The output portion side guide surface (17) shown in (C) is a flat surface without undulations, and therefore has a downward inclination angle (17a) of 7° regardless of the measurement location.

[0079] Figure 1 The input side guide surface (16) shown in (C) is a gently undulating S-shaped curved surface. Since the inclination angle of the tangent line varies depending on the measurement location, when the inclination angles of the tangent lines at multiple measurement locations are measured and the average value is calculated, the downward inclination angle (16a) is 28°.

[0080] The downward inclination angle (16a) of the guide surface (16) on the input side is four times the downward inclination angle (17a) of the guide surface (17) on the output side.

[0081] The structure and effects of the basic example of the valve train are as described above.

[0082] Next, explain Figure 6 to Figure 14 Modifications 1 to 9 of the valve train are shown.

[0083] These Modifications 1 to 9 adopt the same configuration as that of the Basic Example except for the configuration specific to the Modifications described below. Figure 6 to Figure 14 In the drawings, the same reference numerals as those in the basic example are given to the same elements as those in the basic example. In addition, the inherent structures of these Modifications 1 to 9 can be used in combination with each other as long as there is no structural contradiction.

[0084] exist Figure 6 In the modified example 1 shown, the downward inclination angle (16a) of the input portion side guide surface (16) and the downward inclination angle (17a) of the output portion side guide surface (17) are larger than those in the basic example.

[0085] because Figure 6 The output portion side guide surface (17) shown is a flat surface without undulations, and therefore has a downward inclination angle (17a) of 10° regardless of the measurement site.

[0086] because Figure 6 The input portion side guide surface (16) shown is also a flat surface without undulations, and therefore has a downward inclination angle (16a) of 40° regardless of the measurement location.

[0087] The downward inclination angle (16a) of the guide surface (16) on the input side is four times the downward inclination angle (17a) of the guide surface (17) on the output side.

[0088] In the basic example, Figure 1 (C) As shown in Figure 3 During the fully closed period (4a) (4b) of the valve (4) shown in (B) and (C), the oil outflow surface (9) is oriented horizontally, but Figure 7 In the second modification shown in (A) and (B), the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 7 As shown in (A) and (B), the oil outflow surface (9) is oriented in a direction inclined downward toward the input portion (6).

[0089] In the valve train of the second modification, Figure 7 The engine oil (13) flowing out of the oil outflow hole (10) shown in (A) to the oil outflow surface (9) is located at the valve (4). Figure 3 During the longer fully closed period (4a) (4b) shown in (B) and (C), if Figure 7As shown in (A), the engine oil (13) flows toward the input portion (6) side along the downwardly inclined oil outflow surface (9), and the engine oil (13) is sufficiently supplied to the valve drive portion (3) on the input portion (6) side, thereby improving the lubricity of the valve drive portion (3).

[0090] Figure 7 The downward inclination angle (9c) of the oil outflow surface (9) shown in (A) and (B) is measured as follows.

[0091] like Figure 7 As shown in (B), a horizontal virtual line passing through the apex of the oil outflow surface (9) is set as a reference line (41), and the inclination angle of the oil outflow surface (9) relative to the reference line (41) is set as a downward inclination angle (9c).

[0092] because Figure 7 The oil outflow surface (9) shown in (A) and (B) is a flat surface without undulations, and therefore has a downward inclination angle (9c) of 15° regardless of the measurement location.

[0093] Figure 7 The downward inclination angle (9c) of the oil outflow surface (9) shown in (A) and (B) is preferably set to 5° to 25°, and most preferably set to 15°.

[0094] In the Figure 7 When the downward inclination angle (9c) of the oil outflow surface (9) shown in (A) and (B) is set to 5° to 25°, the following effects can be obtained.

[0095] When the angle is less than 5° or exceeds 25°, the supply of the engine oil (13) to the input portion (6) side and the output portion (7) side becomes unbalanced. In the former case, there is a possibility of insufficient supply on the input portion (6) side, and in the latter case, there is a possibility of insufficient supply on the output portion (7) side. In contrast, when the angle is between 5° and 25°, the supply balance is good, and the valve drive portion (3) and the valve (4) will not be over- or under-lubricated.

[0096] When the angle is set to 15°, the best supply balance can be obtained.

[0097] In the basic example, Figure 1 (C) As shown in Figure 3 During the fully closed period (4a) (4b) of the valve (4) shown in (B) and (C), the oil outlet hole (10) is vertical, but Figure 8 In the modified example 3 shown, the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Figure 8 As shown, the oil outflow hole (10) is inclined upward toward the input portion (6).

[0098] In the valve train of the third modification, Figure 8 The engine oil (13) flowing out of the oil outflow hole (10) to the oil outflow surface (9) overflows toward the input portion (6) side, so that the engine oil (13) on the oil outflow surface (9) easily flows toward the input portion (6) side, and the engine oil (13) is sufficiently supplied to the valve drive portion (3) on the input portion (6) side, thereby improving the lubricity of the valve drive portion (3).

[0099] exist Figure 8 In the variation 3 shown in FIG. Figure 7 As in the second modified example shown, during the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in a direction inclined downward toward the input portion (6).

[0100] exist Figure 8 In the variation 3 shown, it is also possible to Figure 2 The same as the basic example shown in (C), during the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in the horizontal direction.

[0101] exist Fig. 9 In the modified example 4 shown in (A) and (B), the rocker arm (2) includes an input portion side guide surface (16) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6), similar to the basic example.

[0102] exist Fig. 9 In the modification example 4 shown in (A) and (B), Fig. 9 As shown in (A), with the axial length direction of the pivot (1) as the width direction, the two width direction end edges (16b)(16b) of the input side guide surface (16) located at both ends of the width direction of the arm part (5) expand from the input part (6) toward the oil outflow boss part (8) side.

[0103] In the valve train of the fourth modification, Fig. 9 As shown in (A) and (B), the engine oil (13) flowing down from the oil outflow boss (8) to the upper surface of the arm (5) is Fig. 9 The expanded input portion side guide surface (16) shown in (A) receives and guides the input portion (6) side, so that the engine oil (13) is sufficiently supplied to the valve drive portion (3) on the input portion (6) side, thereby improving the lubricity of the valve drive portion (3).

[0104] exist Figure 2In the basic example of the rocker arm (2) shown in (C), the oil supply path flowing to the oil outflow hole (10) includes a shaft center passage (22) provided at the center portion of the pivot (1) and a shaft peripheral wall hole (24) extending from the shaft center passage (22) through the shaft peripheral wall (23) of the pivot (1), but the shaft peripheral wall hole (24) has only a pair of horizontal holes. Figure 3 In the fully closed period (4a) (4b) of the valve (4) shown in (B) and (C), the shaft peripheral wall hole (24) and the oil outflow hole (10) are not directly connected.

[0105] exist Fig.10 In the modified example 5 shown in FIG. 1 , the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Fig.10 As shown, the shaft circumferential wall hole (24) and the oil outflow hole (10) are directly connected. That is, the shaft circumferential wall hole (24) and the oil outflow hole (10) are connected in a row by aligning their central axes, and the outlet of the shaft circumferential wall hole (24) and the inlet of the oil outflow hole (10) are made to face each other, so that the shaft circumferential wall hole (24) and the oil outflow hole (10) are directly connected without passing through the fitting gap (1a) between the pivot shaft (1) and the rocker arm (2).

[0106] In the valve train of the fifth modification, during the relatively long fully closed period (4a) (4b) of the valve (4), the engine oil (13) flows from Fig.10 The shaft center passage (22) shown flows out toward the oil outflow surface (9) via the oil outflow hole (10) directly connected to the shaft peripheral wall hole (24), so that the engine oil (13) is sufficiently supplied to the input and output parts (6) (7), thereby improving the lubricity of the valve drive part (3) and the valve (4) on the input and output part (6) (7) side.

[0107] It should be noted that Fig.10 The pivot shaft (1) shown includes a pair of horizontal left and right and a pair of vertical upper and lower shaft peripheral wall holes (24), and the vertical upper shaft peripheral wall hole (24) and the oil outflow hole (10) are directly connected.

[0108] exist Fig.11 In the sixth modified example shown, the rocker arm (2) includes an oil injection hole (25) for injecting the engine oil (13) toward the valve driving portion (3).

[0109] In the valve train of the sixth modification, the engine oil (13) is Fig.11 The oil injection hole (25) shown injects toward the valve driving portion (3), so that the engine oil (13) is sufficiently supplied to the valve driving portion (3), thereby improving the lubricity of the valve driving portion (3).

[0110] In the basic example of a valve train, Fig.12 As shown in (A), the input portion (6) of the rocker arm (2) includes an input bolt (26), and the valve drive portion (3) includes a push rod (27). The push rod (27) includes a bolt receiving surface (27a) in the shape of a concave curved surface at the upper end portion, and the bolt receiving surface (27a) receives the bolt lower end portion (26a) in the shape of a protruding curved surface of the input bolt (26). The bolt receiving surface (27a) includes an oil storage recess (27b) recessed at its inner bottom.

[0111] In the valve train of this basic example, the engine oil (13) is Fig.12 The oil storage recess (27b) shown in (A) is accumulated, so that the engine oil (13) is sufficiently supplied to the lower end portion (26a) of the bolt and the bolt receiving surface (27a), thereby improving the lubricity of the lower end portion (26a) of the bolt and the bolt receiving surface (27a).

[0112] exist Fig.12 In the basic example shown in (A), there is almost no gap between the bolt receiving surface (27a) and the lower end portion (26a) of the bolt, but Fig.12 In the modification 7 shown in (B), an oil storage space (27c) is formed between the bolt receiving surface (27a) and the bolt lower end portion (26a) so as to surround the bolt lower end portion (26a).

[0113] In the valve train of the seventh modification, the engine oil (13) is Fig.12 The oil storage space (27c) shown in (B) is filled, so that the engine oil (13) is sufficiently supplied to the lower end portion (26a) of the bolt and the bolt receiving surface (27a), thereby improving the lubricity of the lower end portion (26a) of the bolt and the bolt receiving surface (27a).

[0114] exist Fig.13 In the basic example shown in (A), the valve drive unit (3) includes a push rod (27) and a tappet (28), and the tappet (28) includes a concave curved rod receiving surface (28a), and the rod receiving surface (28a) receives the protruding curved rod lower end portion (27d) of the push rod (27).

[0115] exist Fig.13 In the modification 8 shown in (B), the rod receiving surface (28a) includes an oil storage recess (28b) recessed in its inner bottom. Fig.13 The basic example shown in (A) is the same.

[0116] In the valve train of the eighth modification, the engine oil (13) is Fig.13The oil storage recess (28b) shown in (B) is accumulated, so that the engine oil (13) is sufficiently supplied to the lower end portion (27d) of the rod and the rod receiving surface (28a), thereby improving the lubricity of the lower end portion (27d) of the rod and the rod receiving surface (28a).

[0117] exist Fig.14 In the modification 9 shown in (A) to (C), the rocker arm (2) has an oil guide groove (18) recessed along the length direction on the upper surface of the arm portion (5) and an oil outflow hole (10) opened on the inner bottom surface (19) of the oil guide groove (18).

[0118] The inner bottom surface (19) of the oil guide groove (18) has an input portion side inner bottom surface (20) for guiding the engine oil (13) flowing out of the oil outflow hole (10) toward the input portion (6) side and an output portion side inner bottom surface (21) for guiding the engine oil (13) flowing out of the oil outflow hole (10) toward the output portion (7) side.

[0119] At the valve (4) Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Fig.14 As shown in (B), the downward inclination angle (20a) of the inner bottom surface (20) on the input side is configured to be larger than the downward inclination angle (21a) of the inner bottom surface (21) on the output side.

[0120] In the valve train of the modification 9, Fig.14 The engine oil (13) that flows out of the oil outflow hole (10) shown in (A) to (C) to the oil guide groove (18) flows toward the input / output part (6) (7) side under the guidance of the oil guide groove (18), so that the engine oil (13) is sufficiently supplied to the valve drive part (3) and the valve (4) on the input / output part (6) (7) side, thereby improving the lubricity of the valve drive part (3) and the valve (4).

[0121] In addition, in the valve train of the modification 9, Fig.14 The engine oil (13) flowing out of the oil outlet hole (10) shown in (A) to (C) to the oil guide groove (18) is discharged into the valve (4). Figure 3 During the relatively long fully closed period (4a) (4b) shown in (B) and (C), the engine oil (13) flows toward the input portion (6) side via the inner bottom surface (20) on the input portion side having a large downward inclination angle (20a), so that the engine oil (13) is particularly sufficiently supplied to the valve drive portion (3) on the input portion (6) side, thereby improving the lubricity of the valve drive portion (3).

[0122] Fig.14 The downward inclination angle (20a) of the inner bottom surface (20) on the input side of the modification 9 shown in (B) is Figure 1 The downward inclination angle (16a) of the input portion side guide surface (16) of the basic example shown in (C) is the same as that of the input portion side guide surface (16). Fig.14 The downward inclination angle (21a) of the inner bottom surface (21) on the output side of the modification 9 shown in (B) is Figure 1 The downward inclination angle (17a) of the output portion side guide surface (17) of the basic example shown in (C) is the same as that of the output portion side guide surface (17).

[0123] and Figure 1 (C) is the same as the basic example shown in FIG. Figure 3 During the fully closed period (4a) (4b) shown in (B) and (C), if Fig.14 As shown in (B), the downward tilt angle (20a) of the inner bottom surface (20) on the input side is 4 times the downward tilt angle (21a) of the inner bottom surface (21) on the output side. This value is preferably 2 to 6 times, more preferably 3 to 5 times, and most preferably 4 times.

[0124] Reasons and Figure 1 The situation is the same as the basic example shown in (C).

[0125] Description of Reference Numerals

[0126] (1) Pivot

[0127] (2) Rocker arm

[0128] (3) Valve drive unit

[0129] (4) Valve

[0130] (4a), (4b): Fully closed period

[0131] (5) Arm

[0132] (6) Input section

[0133] (7): Output section

[0134] (8) Boss for oil outflow

[0135] (8a): Circumference

[0136] (9): Oil outflow surface

[0137] (9a): Length in the input and output directions

[0138] (9b): Length in the width direction

[0139] (10): Oil outflow hole

[0140] (11): Boundary edge

[0141] (12): Input side edge

[0142] (12a): Input side flow path

[0143] (13) Engine oil

[0144] (14): Axillary edge

[0145] (14a): Axillary flow path

[0146] (15): Output side edge

[0147] (15a): Output side flow path

[0148] (16): Input side guide surface

[0149] (16a): Downward tilt angle

[0150] (17): Output side guide surface

[0151] (17a): Downward tilt angle

[0152] (18): Oil guide groove

[0153] (19): Inner bottom surface

[0154] (20): Inner bottom surface on the input side

[0155] (20a): Downward tilt angle

[0156] (21): Inner bottom surface on the output side

[0157] (21a): Downward tilt angle

[0158] (22): Shaft center passage

[0159] (23): Shaft wall

[0160] (24): Shaft wall hole

[0161] (25): Oil injection hole

[0162] (26): Input bolt

[0163] (26a): Lower end of bolt

[0164] (27) Putter

[0165] (27a): Bolt bearing surface

[0166] (27b): Oil storage recess

[0167] (27c): Oil storage space

[0168] (27d): Lower end of rod

[0169] (28) Tappet

[0170] (28a): Rod bearing surface

[0171] (28b): Oil storage recess

Claims

1. A valve transmission device for an engine, characterized in that: The invention comprises: a pivot (1), a rocker arm (2) rotatably supported by the pivot (1), a valve driving unit (3), and an exhaust or intake valve (4) driven by the valve driving unit (3) via the rocker arm (2). 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), an output portion (7) on the other end side of the arm portion (5), and a boss portion (8) for oil outflow. The oil outflow boss portion (8) comprises 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), 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). The boundary edge portion (11) includes 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) to the oil outflow surface (9) flows down from the input portion side edge portion (12) and is supplied to the valve driving portion (3) on the input portion (6) side. The boundary edge portion (11) includes an axillary edge portion (14) located in the axial length direction of the pivot (1). An input portion side flow path (12a) from the oil outflow hole (10) to the input portion side edge (12) is configured to be shorter than an axillary side flow path (14a) from the oil outflow hole (10) to the axillary side edge (14).

2. The valve train of an engine according to claim 1, characterized in that: The boundary edge (11) includes an output portion side edge (15) on the output portion (7) side and an axillary side edge (14) located in the axial length direction of the pivot (1). An output portion side flow path (15a) from the oil outflow hole (10) to the output portion side edge (15) is configured to be shorter than an axillary side flow path (14a) from the oil outflow hole (10) to the axillary side edge (14).

3. The valve train of an engine as claimed in claim 2, characterized in that: The length direction of the arm (5) is taken as the input and output direction, and the axial length direction of the pivot (1) is taken as the width direction. The oil outflow surface (9) has a shape in which a length (9a) in an input / output direction is shorter than a length (9b) in a width direction.

4. The valve train of the engine according to claim 3, characterized in that: During the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in the horizontal direction.

5. The valve train of an engine as claimed in claim 2, characterized in that: During the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in the horizontal direction.

6. The valve train of an engine as claimed in claim 1, characterized in that: The length direction of the arm (5) is taken as the input and output direction, and the axial length direction of the pivot (1) is taken as the width direction. The oil outflow surface (9) has a shape in which a length (9a) in an input / output direction is shorter than a length (9b) in a width direction.

7. The valve train of an engine as claimed in claim 6, characterized in that: During the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in the horizontal direction.

8. The valve train of an engine as claimed in claim 1, characterized in that: During the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in the horizontal direction.

9. The valve train of an engine as claimed in claim 1, characterized in that: The rocker arm (2) includes an input portion side guide surface (16) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6). 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).

10. The valve train of an engine as claimed in claim 1, characterized in that: The rocker arm (2) includes an output portion side guide surface (17) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the output portion (7). During the fully closed period (4a) (4b) of the valve (4), the output portion side guide surface (17) is inclined downward toward the output portion (7).

11. The valve train of an engine as claimed in claim 9, characterized in that: The rocker arm (2) includes an output portion side guide surface (17) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the output portion (7). During the fully closed period (4a) (4b) of the valve (4), the output portion side guide surface (17) is inclined downward toward the output portion (7).

12. The valve train of an engine as claimed in claim 11, characterized in that: 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 configured to be larger than the downward inclination angle (17a) of the output portion side guide surface (17).

13. The valve train of an engine as claimed in claim 12, characterized in that: During the fully closed period (4a) (4b) of the valve (4), the downward tilt angle (16a) of the input side guide surface (16) is configured to be 2 to 6 times the downward tilt angle (17a) of the output side guide surface (17).

14. The valve train of an engine according to any one of claims 1 to 3, characterized in that: During the fully closed period (4a) (4b) of the valve (4), the oil outflow surface (9) is oriented in a direction inclined downward toward the input portion (6).

15. The valve train of an engine according to any one of claims 1 to 13, 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).

16. The valve train of an engine according to any one of claims 1 to 13, characterized in that: The rocker arm (2) includes an input portion side guide surface (16) for guiding the engine oil (13) flowing down from the oil outflow boss portion (8) to the upper surface of the arm portion (5) to the input portion (6). Taking the axial length direction of the pivot (1) as the width direction, the two width direction end edges (16b) of the input part side guide surface (16) located at both ends of the arm part (5) in the width direction expand from the input part (6) toward the oil outflow boss part (8) side.

17. The valve train of an engine according to any one of claims 1 to 13, characterized in that: The oil supply path flowing to the oil outflow hole (10) includes a shaft center passage (22) provided at the center portion of the pivot shaft (1) and a shaft peripheral wall hole (24) extending from the shaft center passage (22) through a shaft peripheral wall (23) of the pivot shaft (1). During the fully closed period (4a) (4b) of the valve (4), the shaft peripheral wall hole (24) and the oil outflow hole (10) are directly connected.

18. The valve train of an engine according to any one of claims 1 to 13, characterized in that: The rocker arm (2) includes an oil injection hole (25) for injecting engine oil (13) toward the valve driving portion (3).

19. The valve train of an engine according to any one of claims 1 to 13, characterized in that: The input portion (6) of the rocker arm (2) includes an input bolt (26), The valve driving part (3) includes a push rod (27), wherein the push rod (27) includes a concave curved bolt receiving surface (27a) at the upper end portion, and the bolt receiving surface (27a) receives the protruding curved bolt lower end portion (26a) of the input bolt (26). The bolt bearing surface (27a) includes an oil storage recess (27b) recessed in its inner bottom.

20. The valve train of an engine according to any one of claims 1 to 13, characterized in that: The input portion (6) of the rocker arm (2) includes an input bolt (26), The valve driving part (3) includes a push rod (27), wherein the push rod (27) includes a concave curved bolt receiving surface (27a) at the upper end portion, and the bolt receiving surface (27a) receives the protruding curved bolt lower end portion (26a) of the input bolt (26). An oil storage space (27c) surrounding the bolt lower end (26a) is formed between the bolt receiving surface (27a) and the bolt lower end (26a).

21. The valve train of an engine according to any one of claims 1 to 13, characterized in that: The valve driving unit (3) includes a push rod (27) and a tappet (28). The push rod (28) includes a rod receiving surface (28a) in the shape of a concave curved surface, and the rod receiving surface (28a) receives the rod lower end portion (27d) in the shape of a protruding curved surface of the push rod (27). The rod bearing surface (28a) includes an oil storage recess (28b) recessed in its inner bottom.

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