JP6025666B2 - engine - Google Patents

Description

  The present invention relates to an engine, and more particularly to an engine capable of suppressing the amount of oil mist generated in a crankcase.

Conventionally, there are the following engines (for example, see Patent Document 1).
A transmission case is provided at one end of the crankcase, an oil pump is provided in the transmission case, the oil pump is configured to be driven via a transmission device in the transmission case, and an oil pan is attached to the lower part of the crankcase The engine oil is stored in the oil pan and covered with a baffle plate from above.

  According to this type of engine, the baffle plate suppresses the spilling of the engine oil stored in the oil pan, and there is an advantage that the output loss due to the crankshaft engine oil stir can be suppressed.

  However, in this type of engine, the oil discharge hole of the relief valve of the oil pump faces the transmission case, and the engine oil discharged from the oil discharge hole is baffled through the opening of the end wall of the crankcase from the transmission case. There is a problem because it flows out into the space above the plate.

JP-A-9-280030 (see FIG. 2)

<Problem> A large amount of oil mist is generated in the crankcase.
The engine oil discharged from the oil discharge hole flows into the space above the baffle plate from the inside of the transmission case through the opening of the end wall of the crankcase, so that the engine oil is swept up by the crankshaft, The amount of oil mist generated increases. For this reason, the amount of engine oil discharged from the breather device increases.

  The subject of this invention is providing the engine which can suppress the generation amount of the oil mist in a crankcase.

Invention specific matters of the invention according to claim 1 are as follows.
As shown in FIGS. 1, 3 and 4, a transmission case (2) is provided at one end of the crankcase (1), an oil pump (3) is provided at the transmission case (2), and an oil pump (3) is provided. Is driven through a transmission device (4) in the transmission case (2), and an oil pan (5) is attached to the lower part of the crankcase (1) and stored in the oil pan (5). In an engine in which engine oil (6) is covered with a baffle plate (7) from above,
An oil inflow hole (9) is provided on the end wall (1a) of the crankcase (1) so as to face the oil discharge hole (8a) of the relief valve (8) of the oil pump (3). ) Faces the lower space (7a) of the baffle plate (7) ,
As illustrated in FIG. 3, FIG. 1 (B), and FIG. 2 (A), the installation direction of the crankshaft (10) is defined as the front-rear direction.
An end wall (1a) of the crankcase (1) is provided on the front-rear direction end side of the crankcase (1), and an oil inflow hole (9) opened in the front-rear direction at the end wall (1a). The engine is characterized in that the oil discharge hole (8a) of the relief valve (8) faces the lower space (7a) of the baffle plate (7) at a position lower than the baffle plate (7).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> The amount of oil mist generated in the crankcase can be suppressed.
As illustrated in FIG. 1B, an oil inflow hole (9a) in which the oil discharge hole (8a) of the relief valve (8) of the oil pump (3) faces the end wall (1a) of the crankcase (1). ) And the oil inflow hole (9) faces the lower space (7a) of the baffle plate (7), so that the engine oil (6) discharged from the oil discharge hole (8a) (9) flows into the lower space (7a) of the baffle plate (7), the engine oil (6) is prevented from being lifted by the crankshaft (10), and the oil mist in the crankcase (1) The generation amount can be suppressed. For this reason, the discharge amount of the engine oil (6) from the breather device (not shown) can be reduced.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The amount of oil mist generated in the transmission case can be suppressed.
As illustrated in FIGS. 1 (A) and 1 (B), an oil inflow hole (9) is provided at the height of the inner bottom surface (2a) of the transmission case (2), and the inner bottom surface (2a) of the transmission case (2). The engine oil (6) that is to be stored in the oil is introduced into the lower space (7a) of the baffle plate (7) from the oil inflow hole (9), so that the transmission device (2) in the transmission case (2) ( The engine oil (6) is prevented from being lifted by 4), and the amount of oil mist generated in the transmission case (2) can be suppressed. For this reason, the amount of engine oil discharged from the breather device can be reduced.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> The amount of oil mist generated in the space below the baffle plate can be suppressed.
As illustrated in FIG. 1B, the oil inflow hole (9) is disposed at a height near the lower surface (7b) of the baffle plate (7), and the engine oil (6) ejected from the oil inflow hole (9). Is configured to be along the lower surface (7b) of the baffle plate (7), so that the engine oil (6) splashes from the oil inflow hole (9) into the lower space (7a) of the baffle plate (7). The amount of oil mist generated in the lower space (7a) of the baffle plate (7) can be suppressed by adhering to and coagulating on the lower surface (7b) of the baffle plate (7) and falling to the oil pan (6). . For this reason, the discharge amount of the engine oil (6) from the breather device can be reduced.

FIG. 1A is a rear view of a transmission case, and FIG. 1B is a longitudinal rear view of a crankcase, illustrating an engine according to an embodiment of the present invention. 2A and 2B are diagrams illustrating the engine of FIG. 1, in which FIG. 2A is a longitudinal rear view of the crankcase, and FIG. 2B is a bottom view of the crankcase. FIG. 2 is a cross-sectional plan view of the engine of FIG. 1. It is a vertical side view of the engine of FIG.

  1 to 4 are diagrams for explaining an engine according to an embodiment of the present invention. In this embodiment, a vertical water-cooled in-line two-cylinder gasoline engine will be described.

The outline of this engine is as follows.
As shown in FIG. 4, the crankcase (1) is provided at the lower part of the cylinder block (11), the crankshaft (10) is installed in the crankcase (1), and the first is formed at the upper part of the cylinder block (11). A cylinder cylinder (17) and a second cylinder (18) are arranged, a cylinder head (not shown) is assembled to the upper part of the cylinder block (11), and a transmission case (2) is attached to the front of the cylinder block (11). Is assembled, a belt case (12) is assembled to the front of the transmission case (2), a flywheel (13) is arranged behind the cylinder block (11), and an oil pan ( 5) is assembled, and engine oil (6) is stored in the oil pan (5).
As shown in FIG. 3, a pair of primary rotation balancers (14) and (14) are installed on the crankcase (1) on both sides of the crankshaft (10). The pair of primary rotation balancers (14) and (14) The crankshaft (10) is interlocked via a transmission device (4) in the transmission case (2). The transmission (4) is a timing transmission gear train.
A transmission belt (15) is accommodated in the belt case (12), and an intake / exhaust valve cam (not shown) is driven through the transmission belt (16).

As shown in FIGS. 1, 3, and 4, a transmission case (2) is provided at one end of the crankcase (1), an oil pump (3) is provided at the transmission case (2), and an oil pump (3) is provided. An engine which is configured to be driven via a transmission device (4) in the transmission case (2), and has an oil pan (5) attached to the lower portion of the crankcase (1) and stored in the oil pan (5). Oil (6) is covered with a baffle plate (7) from above.
The oil pump (3) is for lubricating the engine oil (6) in the engine, and is linked to one of a pair of primary rotary balancers (14) and (14). An oil filter (20) is disposed on the side of the oil pump (3). An oil pump (19) for taking out power is interlocked with the other primary rotation balancer (14).
An oil return port (16) for returning the engine oil (6) leaked from the valve cam or the bearing of the crankshaft (10) to the oil pan (5) is provided at the center of the baffle plate (7).

An oil inflow hole (9) is provided on the end wall (1a) of the crankcase (1) so as to face the oil discharge hole (8a) of the relief valve (8) of the oil pump (3). ) Faces the lower space (7a) of the baffle plate (7).
As shown in FIG. 3, FIG. 1 (B), and FIG. 2 (A), the end wall (1a) of the crankcase (1) is the crankcase (1) with the installation direction of the crankshaft (10) as the front-rear direction. The oil discharge hole (8a) of the relief valve (8) is connected to the baffle plate (9a) through an oil inflow hole (9) that is provided on the end side in the front-rear direction and is opened in the front-rear direction at the end wall (1a). It faces the lower space (7a) of the baffle plate (7) at a position lower than 7).

  As shown in FIGS. 1 (A) and 1 (B), an oil inflow hole (9) is provided at the height of the inner bottom surface (2a) of the transmission case (2), and is formed on the inner bottom surface (2a) of the transmission case (2). The engine oil (6) to be accumulated is configured to flow into the lower space (7a) of the baffle plate (7) from the oil inflow hole (9).

  As shown in FIG. 1B, the oil inflow hole (9) is disposed at a height near the lower surface (7b) of the baffle plate (7), and the engine oil (6) ejected from the oil inflow hole (9) It is comprised along the lower surface (7b) of a baffle plate (7).

(1) Crank case
(1a) End wall
(2) Transmission case
(2a) Inner bottom
(3) Oil pump
(4) Transmission device
(5) Oil pan
(6) Engine oil
(7) Baffle plate
(7a) Lower space
(7b) Bottom surface
(8) Relief valve
(8a) Oil discharge hole
(9) Oil inflow hole

Claims (3)

A transmission case (2) is provided at one end of the crankcase (1), an oil pump (3) is provided in the transmission case (2), and the oil pump (3) is connected to a transmission device (4 in the transmission case (2). ), An oil pan (5) is attached to the lower part of the crankcase (1), and the engine oil (6) stored in the oil pan (5) is supplied from above to the baffle plate (7 In the engine covered with
An oil inflow hole (9) is provided on the end wall (1a) of the crankcase (1) so as to face the oil discharge hole (8a) of the relief valve (8) of the oil pump (3). ) Faces the lower space (7a) of the baffle plate (7) ,
With the installation direction of the crankshaft (10) as the front-rear direction,
An end wall (1a) of the crankcase (1) is provided on the front-rear direction end side of the crankcase (1), and an oil inflow hole (9) opened in the front-rear direction at the end wall (1a). The engine is characterized in that the oil discharge hole (8a) of the relief valve (8) faces the lower space (7a) of the baffle plate (7) at a position lower than the baffle plate (7). The engine according to claim 1,
The oil inflow hole (9) is provided at the height of the inner bottom surface (2a) of the transmission case (2), and the engine oil (6) trying to accumulate on the inner bottom surface (2a) of the transmission case (2) An engine characterized by being configured to flow from 9) into a lower space (7a) of the baffle plate (7). The engine according to claim 1 or 2,
The oil inflow hole (9) is disposed at a height near the lower surface (7b) of the baffle plate (7), and the engine oil (6) ejected from the oil inflow hole (9) is disposed on the lower surface (7b) of the baffle plate (7). An engine characterized by being configured to follow.

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