Engine

Abstract

Provided is an engine in which lubrication of a cam (5a) of a cam shaft (5) is not impaired even in an engine having a shaftless specification when a cylinder block (2) is shared in engines having different specifications differentiated according to the presence or absence of a predetermined rotational axis (R). The camshaft chamber front wall (2b) has a front bearing hole (2d) of the camshaft (5) and a front hole (2e) disposed below the front bearing hole (2d), the camshaft chamber rear wall (2f) has a rear hole (2g) concentric with the front hole (2e), and the cylinder block front wall (2a) has an oil supply passage (8) in which a passage outlet (8a) is formed in the inner peripheral surface of the front hole (2e). A fitting member (9) that covers a passage outlet (8a) of the oil supply passage (8) is fitted into a front hole (2e) of a camshaft chamber front wall (2b), and the fitting member (9) has a camshaft oil injection hole (9a) that injects engine oil (7) from the oil supply passage (8) toward the camshaft (5).

Description

Technical Field

[0001] The present invention relates to an engine, and more particularly to an engine that does not hinder lubrication of a cam of a camshaft even in an engine with no shaft specification, when a cylinder block is shared by engines of different specifications distinguished by the presence or absence of a predetermined rotating shaft. Background Art

[0002] Conventionally, there is an engine in which a predetermined rotating shaft (governor shaft) is provided on a camshaft chamber (for example, refer to Patent Document 1).

[0003] It is conceivable to manufacture a shaftless engine without a predetermined rotating shaft (governor shaft) by using the same cylinder block as a shaft-specification engine having the predetermined rotating shaft (governor shaft).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-83336 (refer to Figure 1 ) Summary of the invention

[0007] Problems to be solved by the invention

[0008] <Problem> In a shaftless engine, there is a possibility that the lubrication of the cam of the camshaft may be hindered.

[0009] As described above, when manufacturing a shaftless engine, since the engine oil cannot be splashed by a predetermined rotating shaft (governor shaft), the oil mist in the camshaft chamber may be insufficient, which may hinder the lubrication of the cam of the camshaft.

[0010] An object of the present invention is to provide an engine that, when a cylinder block is shared by engines of different specifications distinguished by the presence or absence of a predetermined rotating shaft, does not hinder lubrication of a cam of a camshaft even in an engine of a shaftless specification.

[0011] Technical solutions to the problem

[0012] The main structure of the invention of this application is as follows.

[0013] An engine, characterized in that

[0014] like Figure 1 As shown in the example, the installation direction of the crankshaft (1) is the front-rear direction, one side of the front-rear direction is the front, and the other side is the rear. Figure 2 As shown in the example, the engine has a cylinder block front wall (2a), a camshaft chamber front wall (2b), and Figure 3The camshaft chamber (2c) is provided on the rear side of the camshaft chamber front wall (2b) as shown in the example, and a camshaft (5) is accommodated in the camshaft chamber (2c).

[0015] like Figure 3 As shown in the example, the camshaft chamber front wall (2b) has a front bearing hole (2d) of the camshaft (5) and a front hole (2e) arranged below the front bearing hole (2d), and the camshaft chamber rear wall (2f) has a rear hole (2g) concentric with the front hole (2e).

[0016] like Figure 2 As shown in the example, the cylinder block front wall (2a) has an oil supply passage (8) having a passage outlet (8a) formed on the inner peripheral surface of the front hole (2e), and an insert component (9) covering the passage outlet (8a) of the oil supply passage (8) is embedded in the front hole (2e) of the camshaft chamber front wall (2b), as shown in FIG. Figure 3 As shown in the example, the insert component (9) has a camshaft oil injection hole (9a) for injecting the engine oil (7) from the oil supply passage (8) toward the camshaft (5).

[0017] Effects of the Invention

[0018] The present invention has the following effects.

[0019] <Effect> When a cylinder block (2) is shared by engines of different specifications distinguished by the presence or absence of a specified rotating shaft (R), lubrication of the cam (5a) of the camshaft (5) will not be hindered even in an engine of shaftless specification.

[0020] like Fig.10 As shown in the example, if a specified rotating shaft (R) is mounted below the camshaft (5) via front and rear bearings (30d) and (30e) embedded in a front hole (2e) and a rear hole (2g) without an embedded component (9), an engine with shaft specifications can be manufactured, and therefore, the cylinder block (2) can be shared with an engine with shaft specifications.

[0021] And, if Figure 3 As shown in the example, since the engine oil (7) is injected from the oil injection hole (9a) toward the camshaft (5), even if the predetermined rotating shaft (R) ( Fig.10 The engine with a shaftless specification (as shown in the example) will not cause any obstruction to the lubrication of the cam (5a) of the camshaft (5).

[0022] Thus, when the cylinder block (2) is shared by engines of different specifications distinguished by the presence or absence of a predetermined rotating shaft (R), lubrication of the cam (5a) of the camshaft (5) will not be hindered even in an engine of shaftless specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a right side view of a partially cut-away main portion of a shaftless engine according to an embodiment of the present invention.

[0024] Figure 2 yes Figure 1 Sectional view along line II-II.

[0025] Figure 3 yes Figure 2 Cross-sectional view along line III-III.

[0026] Figure 4 yes Figure 1 Sectional view along line IV-IV.

[0027] Figure 5 yes Figure 1 Right side view of the engine.

[0028] Figure 6 yes Figure 1 Left side view of the engine.

[0029] Figure 7 yes Figure 1 Front view of the engine.

[0030] Figure 8 yes Figure 1 Rear view of the engine.

[0031] Fig. 9 yes Figure 1 Top view of the engine.

[0032] Fig.10 is with Figure 1 A right side view of the partially cutaway main parts of an engine with shaft specifications for a common cylinder block of an engine.

[0033] Fig.11 yes Fig.10 XI-XI line cross-sectional view.

[0034] Fig.12 yes Fig.10 Sectional view along line XII-XII. DETAILED DESCRIPTION

[0035] Figures 1 to 9 1 is a diagram for explaining a shaftless engine according to an embodiment of the present invention. Figures 10 to 12 This is a diagram for explaining an engine with a shaft specification that shares a cylinder block with an engine with a shaftless specification, and in this embodiment, is a common rail type vertical in-line multi-cylinder (three-cylinder) diesel engine.

[0036] like Figure 1As shown, the crankshaft installation direction is the front-to-back direction, one side of the front-to-back direction is the front, and the other side is the rear. Figure 2 As shown, the width direction of the engine perpendicular to the front-rear direction is referred to as the lateral direction.

[0037] Figure 5 The shaftless engine shown has: a cylinder block (2); a cylinder head (14) assembled on the upper part of the cylinder block (2); a cylinder head cover (15) assembled on the upper part of the cylinder head (14); a timing transmission case (10) assembled on the front part of the cylinder block (2); an engine cooling fan (16) arranged on the front side of the timing transmission case (10); a flywheel (17) arranged on the rear part of the cylinder block (2); and an oil pan (18) assembled on the lower part of the cylinder block (2). The lower part of the cylinder block (2) constitutes a crankcase (2h).

[0038] A crankshaft (1) is accommodated in the crankcase (2h).

[0039] The engine has an intake device, a fuel supply device and an exhaust device.

[0040] like Figure 5 As shown, the intake device has an intake manifold (19) assembled on one lateral side of the cylinder head (14). The air in the intake manifold (19) is sucked into each cylinder (not shown) from an intake port (not shown) by opening an intake valve (not shown).

[0041] Figure 6 As shown, the exhaust device has an exhaust manifold (20) assembled on the other lateral side of the cylinder head (14). The exhaust gas of each cylinder is discharged from the exhaust port (not shown) to the exhaust manifold (20) by opening the exhaust valve (not shown).

[0042] The suction valve and exhaust valve are Figure 4 The cam (not shown) of the valve cam shaft (21) is driven to open and close.

[0043] Figure 5 As shown, the fuel supply device comprises a fuel pressure pump (4) and a fuel injection device (3).

[0044] The fuel injection device (3) is a common rail type fuel injection device (3a) having a common rail (3b) and a fuel injector (3c) for injecting liquid fuel accumulated in the common rail (3b) into each cylinder.

[0045] The fuel pressure pump (4) that supplies liquid fuel to the common rail (3b) is a fuel supply pump (4a).

[0046] Figure 5The solenoid valve of the fuel injector (3c) shown is opened at a specified time for a specified period of time based on the detection of the accelerator position and the engine load under the control of the engine ECU (22), and a specified amount of liquid fuel is injected from the fuel injector (3c) to each cylinder at the specified time. The engine ECU (22) is installed on the side of the intake side of the cylinder block (2).

[0047] ECU is the abbreviation of electronic control unit, which uses a microcomputer.

[0048] The engine ECU (22) functions as a control device (6) for the engine.

[0049] Figure 5 The opening and closing timing of the electromagnetic valve of the fuel injector (3c) shown is set based on the crankshaft angle of the crankshaft (1) and the cam position of the valve camshaft (21).

[0050] The accelerator position is detected by an accelerator position sensor (not shown).

[0051] The engine load is calculated by the engine ECU (22) by comparing the accelerator position and the engine speed.

[0052] The engine speed and the crankshaft angle of the crankshaft (1) are detected by an electromagnetic pickup (not shown) for detecting the unevenness of the outer circumference of a crankshaft disk (not shown) mounted on the crankshaft (1), and the cam position is detected by a cam mounted on the crankshaft (1). Figure 4 A cam position sensor (not shown) detects the concavo-convex portions of the outer circumference of a camshaft disk (not shown) of the valve camshaft (21) shown.

[0053] like Figure 2 As shown, the engine has a cylinder block front wall (2a), a camshaft chamber front wall (2b) and Figure 3 The camshaft chamber (2c) shown is arranged on the rear side of the camshaft chamber front wall (2b), and a camshaft (5) is accommodated in the camshaft chamber (2c).

[0054] like Figure 2 As shown, the camshaft (5) is a pump driving camshaft (5) that drives the fuel pressure pump (4).

[0055] like Figure 3 As shown, the front wall (2b) of the camshaft chamber has a front bearing hole (2d) of the camshaft (5) and a front hole (2e) arranged below it, and the rear wall (2f) of the camshaft chamber has a rear hole (2g) concentric with the front hole (2e).

[0056] like Fig.10As shown, by installing a predetermined rotating shaft (R) below the camshaft (5) via front and rear bearings (30d) and (30e) embedded in a front hole (2e) and a rear hole (2g) without an embedded component (9), an engine with shaft specifications can be manufactured, so that the cylinder block (2) can be used in common in an engine with shaftless specifications and an engine with shaft specifications.

[0057] like Figure 2 As shown, the cylinder block front wall (2a) has an oil supply passage (8) having a passage outlet (8a) formed on the inner peripheral surface of the front hole (2e), and an insert component (9) covering the passage outlet (8a) of the oil supply passage (8) is embedded in the front hole (2e) of the camshaft chamber front wall (2b), as shown in FIG. Figure 3 As shown, the insert component (9) has a camshaft oil injection hole (9a) for injecting engine oil (7) from the oil supply passage (8) toward the camshaft (5).

[0058] like Figure 3 As shown, since the engine oil (7) is sprayed toward the camshaft (5) from the camshaft oil injection hole (9a), even if there is no predetermined rotating shaft (R) ( Fig.10 In the case of a shaftless engine (shown in the figure), there will be no obstruction to the lubrication of the cam (5a) of the camshaft (5).

[0059] Thus, when a cylinder block (2) is used in common by engines of different specifications distinguished by the presence or absence of a predetermined rotating shaft (R), lubrication of the cam (5a) of the camshaft (5) will not be hindered even in an engine of shaftless specification.

[0060] like Figure 2 As shown, the camshaft (5) has a cam (5a) for driving a fuel pressure pump (4) inserted into the camshaft chamber (2c).

[0061] The predetermined rotating shaft (R) is a PTO shaft (30). PTO is an abbreviation for power take-off, which refers to the work output taken out from the engine.

[0062] The predetermined rotating shaft (R) may be a speed governor shaft or a balancer shaft in addition to the PTO shaft (30).

[0063] like Figure 4 As shown, in this engine, the camshaft chamber front wall (2b) extends laterally from the cylinder block front wall (2a), as shown in FIG. Figure 2 As shown, a camshaft chamber (2c) is formed on a lateral side of the cylinder block (2).

[0064] like Figure 3 As shown, in this engine, a camshaft oil injection hole (9a) is provided in an inner diameter portion (9b) along the inner diameter of an insert component (9).

[0065] In the engine, the arrangement or orientation of the camshaft oil injection hole (9a) has a high degree of freedom, and the injection direction or injection position of the engine oil (7) from the camshaft oil injection hole (9a) can be optimized.

[0066] like Figure 3 As shown, in this engine, a camshaft input gear (12) of a camshaft (5) is provided on the front side of the camshaft chamber front wall (2b), as shown in FIG. Figure 3 , Figure 4 As shown, the insert component (9) has a gear oil injection hole (9c) for injecting engine oil (7) from the oil supply passage (8) toward the camshaft input gear (12).

[0067] In the engine, since the engine oil (7) from the oil supply passage (8) is sprayed from the gear oil spray hole (9c) toward the camshaft input gear (12), the lubricity of the camshaft input gear (12) is high.

[0068] like Figure 3 , Figure 4 As shown, in this engine, the camshaft oil injection hole (9a) and the gear oil injection hole (9c) are provided in the inner diameter portion (9b) along the inner diameter of the embedded component (9).

[0069] In the engine, the configuration or orientation of the camshaft oil injection hole (9a) and the gear oil injection hole (9c) has a high degree of freedom, and the injection direction or injection position of the engine oil (7) from the camshaft oil injection hole (9a) and the gear oil injection hole (9c) can be optimized.

[0070] like Figure 3 As shown, in the engine, the embedded component (9) has a cylindrical sleeve portion (9d) embedded in the front hole (2e), a disc-shaped inner diameter portion (9b) along the inner diameter of the sleeve portion (9d), a raised portion (9e) extending from the inner peripheral surface of the sleeve portion (9d) along the front and back surfaces of the inner diameter portion (9b), and a Figure 2 The oil supply passage (8) shown in FIG. Figure 3 The camshaft oil injection hole (9a) and the gear oil injection hole (9c) are shown as being led out from the oil introduction passage (9f).

[0071] like Figure 2 As shown, in this engine, the cam (5a) of the camshaft (5) has three cam lobes at intervals of 120° in the circumferential direction of the camshaft (5).

[0072] Through these three cam lobes, in one combustion cycle of a crankshaft angle of 720°, the fuel supply pump (4a) pressurizes liquid fuel to the common rail (3b) every 240° of the crankshaft angle.

[0073] like Figure 3 As shown, the camshaft (5) is supported by a camshaft front bearing (5b) embedded in a front bearing hole (2d) and a camshaft rear bearing (5c) embedded in a rear bearing hole (2k) concentric with the camshaft front bearing (5b), and is mounted in a camshaft chamber (2c).

[0074] The rear bearing hole (2k) is formed in the rear wall (2f) of the camshaft chamber and is blocked by the camshaft rear plug (2ka).

[0075] The rear hole (2g) is blocked by a rear hole plug (2ga).

[0076] like Figure 3 As shown, in the engine, the camshaft chamber (2c) has: upper and lower oil mist inlets (2n), (2p) communicating with the crankcase (2h); and Figure 4 The oil mist outlet (2q) is connected to the timing transmission case (10) shown in the figure; the oil mist of the engine oil (7) splashed toward the crankshaft (1) in the crankcase (2h) is discharged from Figure 3 The upper and lower oil mist inlet ports (2n) and (2p) shown are introduced into the camshaft chamber (2c), whereby the cam (5a) of the pump-driven camshaft (5) is lubricated, and the oil mist in the camshaft chamber (2c) is pumped out. Figure 4 The oil mist outlet (2q) shown is introduced into the timing transmission box (10), thereby lubricating the timing transmission gear system (11) such as the camshaft input gear (12).

[0077] like Figure 4 As shown, in the engine, a timing transmission case (10) covers a cylinder block front wall (2a) and a camshaft chamber front wall (2b) from the front side, and a timing transmission gear train (11) accommodated in the timing transmission case (10) comprises a crankshaft gear (1a) mounted on a crankshaft (1), an idle gear (13) meshing with the crankshaft gear (1a), a camshaft input gear (12) meshing with the idle gear (13), and a valve camshaft input gear (21a).

[0078] The gear ratios of the crankshaft gear (1a), the camshaft input gear (12) of the pump drive camshaft (5), and the valve camshaft input gear (21a) are all 2. When the crankshaft (1) rotates twice, the pump drive camshaft (5) and the valve camshaft (21) rotate once.

[0079] The structure of a shaft-type engine that shares a cylinder block (2) with a shaft-less type engine that does not have a predetermined rotating shaft (R) is as follows.

[0080] like Figure 10 to Figure 12 As shown, the engine has a PTO shaft (30) as a specified rotating shaft (R), the PTO shaft (30) has a PTO shaft input gear (30a), a shaft diameter portion (30b) and a slit-shaped PTO shaft output portion (30c) at the rear end, the PTO shaft (30) is supported by a front bearing (30d) embedded in a front hole (2e) and a rear bearing (30e) embedded in a rear hole (2g), and is mounted on the lower part of the camshaft chamber (2c).

[0081] The PTO output from the PTO shaft (30) is achieved by removing the rear hole plug (2ga) from the rear hole (2g) and connecting the input portion of a working device such as a hydraulic pump to the PTO shaft output portion (30c).

[0082] The predetermined rotating shaft (R) may be a speed governor shaft or a balancer shaft in addition to the PTO shaft (30).

[0083] Other structures and Figures 1 to 9 The engine is the same as the shaftless version shown. Figure 10 to Figure 12 In, with Figures 1 to 9 The same feature annotations and Figures 1 to 9 Same reference numerals.

[0084] Description of reference numerals:

[0085] (1): crankshaft, (2a): front wall of cylinder block, (2b): front wall of camshaft chamber, (2c): camshaft chamber, (2d): front bearing hole, (2e): front hole, (2f): rear wall of camshaft chamber, (2g): rear hole, (5): camshaft, (7): engine oil, (8): oil supply passage, (8a): passage outlet, (9): embedded component, (9a): oil injection hole for camshaft, (9b): inner diameter portion, (9c): oil injection hole for gear, (12): camshaft input gear.

Claims

1. An engine, characterized in that: Taking the installation direction of the crankshaft (1) as the front-to-back direction, taking one side of the front-to-back direction as the front and the other side as the rear, the engine comprises a cylinder block front wall (2a), a camshaft chamber front wall (2b), and a camshaft chamber (2c) arranged on the rear side of the camshaft chamber front wall (2b), wherein a camshaft (5) is accommodated in the camshaft chamber (2c). The front wall (2b) of the camshaft chamber has a front bearing hole (2d) of the camshaft (5) and a front hole (2e) arranged below the front bearing hole (2d), and the rear wall (2f) of the camshaft chamber has a rear hole (2g) concentric with the front hole (2e). The cylinder block front wall (2a) has an oil supply passage (8) having a passage outlet (8a) formed on the inner peripheral surface of the front hole (2e), and an embedded component (9) covering the passage outlet (8a) of the oil supply passage (8) is embedded in the front hole (2e) of the camshaft chamber front wall (2b), and the embedded component (9) has a camshaft oil injection hole (9a) for injecting engine oil (7) from the oil supply passage (8) toward the camshaft (5).

2. The engine according to claim 1, characterized in that The camshaft oil injection hole (9a) is provided at an inner diameter portion (9b) along the inner diameter of the embedded component (9).

3. The engine according to claim 1, characterized in that A camshaft input gear (12) of a camshaft (5) is provided on the front side of a camshaft chamber front wall (2b), and an embedded component (9) has a gear oil injection hole (9c) for injecting engine oil (7) from an oil supply passage (8) toward the camshaft input gear (12).

4. The engine according to claim 3, characterized in that The camshaft oil injection hole (9a) and the gear oil injection hole (9c) are provided in the inner diameter portion (9b) along the inner diameter of the embedded component (9).

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