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DE-112023006495-T5 - MOTOR

DE112023006495T5DE 112023006495 T5DE112023006495 T5DE 112023006495T5DE-112023006495-T5

Abstract

An engine (1) includes: a cylinder assembly (2); a rocker arm housing (3) provided in an upper section of the cylinder assembly, which has an interior that serves as a valve train component receiving chamber (3A); and an oil pan (4) provided in a lower section of the cylinder assembly, which has an interior that serves as an oil storage chamber (4A). An oil drain channel (31) and an exhaust channel (32) are formed within the cylinder assembly. The oil drain channel extends through the cylinder assembly from an upper end to a lower end thereof and communicates with the valve train component receiving chamber and the oil storage chamber. The exhaust channel extends upward from the lower end of the cylinder assembly, opens at the lower end of the cylinder assembly, and communicates with the oil storage chamber. One upper end of the exhaust channel is closed. An outwardly opening gas outlet (320) is provided at a position of the exhaust channel, the position being spaced upward from the lower end of the cylinder assembly.

Inventors

  • ONO YUTAKA
  • KIMURA MITSUYOSHI

Assignees

  • KOMATSU MFG CO LTD

Dates

Publication Date
20260507
Application Date
20230906
Priority Date
20230906

Claims (7)

  1. Engine, comprising: a cylinder unit in which a cylinder extending in an up-down direction is formed; a rocker arm housing provided in an upper section of the cylinder unit and having an interior that serves as a receiving space for valve train components; and an oil pan provided in a lower section of the cylinder assembly, comprising an interior serving as an oil storage chamber, wherein an oil drain channel and an exhaust channel, each separated from the cylinder, are formed within the cylinder assembly, the oil drain channel extends through the cylinder assembly from an upper end to a lower end thereof and communicates with the valve train component receiving chamber and the oil storage chamber, the exhaust channel extends upward from the lower end of the cylinder assembly at a position horizontally spaced from the oil drain channel, opens at the lower end of the cylinder assembly, and communicates with the oil storage chamber, an upper end of the exhaust channel is closed, and an outwardly opening gas outlet port is provided at a position of the exhaust channel, the position being spaced upward from the lower end of the cylinder assembly.
  2. Engine after Claim 1 , wherein a horizontal channel, separated from the cylinder, runs in a horizontal direction and causes the oil drain channel and the exhaust channel to be connected, is formed within the cylinder unit and the gas outlet opening is arranged above a connection position of the exhaust channel with the horizontal channel.
  3. Engine after Claim 2 , wherein a multitude of oil drain channels are formed within the cylinder unit and the horizontal channel causes the multitude of oil drain channels to be interconnected.
  4. Engine after Claim 2 or 3 , wherein a plurality of cylinders are arranged at a distance in a first straight direction perpendicular to the up-down direction, the oil drain channel is arranged on each of the two sides of the cylinders in a second straight direction perpendicular to the up-down direction and to the first straight direction, the exhaust channel is arranged in the second straight direction at least on one side of the cylinder, and the horizontal channel includes first horizontal channels, each arranged on both sides of the cylinders in the second straight direction and extending in the first straight direction, and second horizontal channels, which cause the first horizontal channels, each arranged on both sides of the cylinders in the second straight direction, to be interconnected.
  5. Engine after Claim 2 or 3 , wherein the cylinder unit includes a cylinder block enclosing the cylinder and a cylinder head arranged on an upper surface of the cylinder block and covering an upper end of the cylinder, and the oil drain channel, exhaust channel and horizontal channel are formed within a rib provided on a side surface of the cylinder block.
  6. Engine after Claim 5 , wherein a plurality of cylinders are arranged at a distance in a first straight direction perpendicular to the up-down direction and the rib which runs in the up-down direction and includes the oil drain channel and the exhaust channel is arranged between the cylinders which are next to each other in the first straight direction.
  7. Engine after one of the Claims 1 until 3 , wherein the cylinder unit includes a cylinder block enclosing the cylinder opening on an upper surface and a cylinder head arranged on an upper surface of the cylinder block and covering an upper end of the cylinder, the exhaust port being configured to run through the cylinder block from an upper end to a lower end thereof, and the upper end of the exhaust port being closed by the cylinder head.

Description

TECHNICAL AREA This invention relates to an engine. STATE OF THE ART Patent document 1 discloses an engine that releases blow-by gas into the atmosphere. Blow-by gas is exhaust gas that escapes from a combustion chamber into other internal spaces of the engine (for example, spaces within a crankcase and a rocker arm housing). The blow-by gas escaping into these other internal spaces transforms the surrounding lubricating oil into a mist and mixes with the misty oil (mist oil). LIST OF COUNTERPOINTMENTS PATENT LITERATURE Patent document 1: JP 11-107737 A BRIEF SUMMARY OF THE INVENTION TECHNICAL PROBLEM To comply with emissions regulations, a further reduction in the oil mist contained in the blow-by gas released into the atmosphere is expected. The present invention was developed with regard to such a problem and one objective of it is to provide an engine that makes it possible to effectively reduce the oil mist contained in blow-by gas released into the atmosphere. SOLUTION TO THE PROBLEM An engine according to one aspect of the present invention includes: a cylinder unit in which a cylinder extending in an up-down direction is formed; a rocker arm housing provided in an upper section of the cylinder unit and having an interior that serves as a receiving space for valve train components; and an oil pan provided in a lower section of the cylinder unit and having an interior that serves as an oil storage space. Within the cylinder unit, an oil drain channel and an exhaust channel are formed, each separated from the cylinder. The oil drain channel runs through the cylinder unit from an upper end to a lower end and is connected to the valve train component receiving chamber and the oil storage chamber. The exhaust channel extends upwards from the lower end of the cylinder unit at a position horizontally spaced from the oil drain channel, opens at the lower end of the cylinder unit, and is connected to the oil storage chamber. An upper end of the exhaust channel is closed, and an outwardly opening gas outlet is provided at a position of the exhaust channel spaced upwards from the lower end of the cylinder unit. ADVANTAGEOUS EFFECTS OF THE INVENTION The present invention makes it possible to further and effectively reduce oil mist contained in blow-by gas released into the atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS 1 is a side view illustrating a motor unit including a motor according to one embodiment.2 This is a side cross-sectional view of the engine. 1 .3 is a cross-sectional view along III-III in 1 .4 is a cross-sectional view along IV-IV in 1 .5 is a cross-sectional view along VV in 1 .6 is a schematic view of the engine unit in 1 corresponds.7 is a schematic view of the cylinder unit in 5 corresponds. DESCRIPTION OF EXECUTION FORMS The following describes an engine according to one embodiment with reference to the 1 to 7 described in detail. In the 1 to 7 The up-down direction of motor 1 is specified as the Z-axis direction. A first straight direction perpendicular to the Z-axis direction is defined as the X-axis direction. A second straight direction perpendicular to both the Z-axis and the X-axis directions is defined as the Y-axis direction. It should be noted that in the following description, any given direction in an XY plane that includes the X-axis and Y-axis directions can be referred to as the "horizontal direction". As in 1 As illustrated, the engine 1 according to the present embodiment includes a cylinder unit 2, a rocker arm housing 3 and an oil pan 4. Cylinder unit As in 2 As illustrated, a cylinder 11 is formed within cylinder unit 2. The cylinder 11 is located in an upper section of cylinder unit 2. Cylinder 11 is a chamber in which a piston 5 is arranged and extends in an up-down direction (Z-axis direction). The piston 5 is subjected to the pressure of combustion gas burned in cylinder 11 and moves back and forth in an up-down direction. A chamber of cylinder 11, located at the top of the piston 5, functions as a combustion chamber 11A. A large number of the cylinders 11 are arranged with a distance in the first straight direction (X-axis direction). In the example illustrated in the drawing, the number of cylinders 11 is six. However, their number is not limited to this. As in 5 To illustrate, each of the cylinders 11, viewed from top to bottom, is formed in a round shape. Thus, the distance between cylinders 11 in the first straight direction is large at both side sections in the second straight direction (Y-axis direction) of the cylinder 11 compared to the central section in the second straight direction (Y-axis direction) of the cylinder 11. As in 2 As illustrated, the lower section of the cylinder unit 2 is designed as a crankcase 12, in which a crankshaft (not illustrated) is housed. An interior 12A of the crankcase 12, in which the crankshaft is housed, is coupled to a lower end of each of the cylinders 11. The lower end of the crankcase 12 is open and is covered by an oil pa