JP2021113552A - Electronic control type engine - Google Patents

Abstract

To provide an electronic control type engine which can protect a connector 8a of a fuel injector 8 from a collision with a falling object.SOLUTION: An electronic control type engine includes: a cylinder head cover 17; and a connector 8a of a fuel injector 8 protruding upward from a ceiling wall 17a of the cylinder head cover 17. The electronic control type engine further includes: a ceiling wall portion 17b of the cylinder head cover 17 located around the connector 8a; a spacer 9 attached to the ceiling wall portion 17b; and a breather valve 10. The spacer 9 includes: a placement portion 9a placed on the ceiling wall portion 17b of the cylinder head cover 17; and an eaves portion 9b which covers the connector 8a from above. The breather valve 10 is provided at the eaves portion 9b.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electronically controlled engine, and more particularly to an electronically controlled engine capable of protecting a fuel injector connector from collisions with falling objects.

Conventionally, there is an electronically controlled engine including a cylinder head cover and a connector of a fuel injector protruding upward from the ceiling wall of the cylinder head cover (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 10-82356 (see FIGS. 1 and 4)

<< Problem >> The connector may be damaged by the collision of a falling object.
In the engine of Patent Document 1, since the connector is exposed on the upper side of the ceiling wall of the cylinder head cover, if a tool or a part is dropped above the cylinder head cover during maintenance, the connector will be damaged by the collision of a falling object. There is a risk.

An object of the present invention is to provide an electronically controlled engine capable of protecting the connector of a fuel injector from a collision of a falling object.

The main configurations of the present invention are as follows.
As shown in FIGS. 1A and 2, the ceiling wall portion (17b) of the cylinder head cover (17) around the connector (8a), the spacer (9) attached to the ceiling wall portion (17b), and the spacer (9). Equipped with a breather valve (10)
The spacer (9) includes a mounting portion (9a) mounted on the ceiling wall portion (17b) of the cylinder head cover (17) and an eaves portion (9b) that covers the connector (8a) from above. An electronically controlled engine characterized in that a breather valve (10) is provided in 9b).

The invention of the present application has the following effects.
<< Effect >> The connector (8a) of the fuel injector (8) can be protected from the collision of falling objects.
As illustrated in FIGS. 1A and 2, the spacer (9) includes an eaves portion (9b) that covers the connector (8a) from above, so that the spacer (9) is above the cylinder head cover (17) during maintenance. When a tool, a part, or the like is dropped, the falling object is received by the eaves portion (9b), and the connector (8a) of the fuel injector (8) can be protected from the collision of the falling object.

In the figure explaining the engine which concerns on embodiment of this invention, FIG. 1A is a vertical sectional view of a spacer and its peripheral portion, FIG. 1B is a perspective view of the spacer as viewed from above, and FIG. ) Is a perspective view of the spacer as viewed from below. It is a perspective view of the cylinder head cover of the engine which concerns on embodiment of this invention, and its peripheral part. It is a right side view of the engine which concerns on embodiment of this invention. It is a front view of the engine which concerns on embodiment of this invention. It is a left side view of the engine which concerns on embodiment of this invention.

1 to 5 are views for explaining an electronically controlled engine according to an embodiment of the present invention. In this embodiment, a common rail fuel injection vertical in-line multi-cylinder electronically controlled diesel engine will be described.

The outline of this engine is as follows.
As shown in FIG. 5, this engine includes a cylinder block (15), a cylinder head (16) assembled on the upper part of the cylinder block (15), and a cylinder head cover (16) assembled on the upper part of the cylinder head (16). 17) and the transmission cover (3a) arranged on the front side of the cylinder block (15) with the erection direction of the crank shaft (1) in the front-rear direction and one in the front-rear direction as the front, and the rear part of the cylinder block (15). It includes an arranged fly wheel (20) and an oil pan (29) assembled to the bottom of the cylinder block (15). The inside of the transmission cover (3a) covers the transmission device (3) shown in FIG.

As shown in FIG. 4, the transmission device (3) is a timed transmission gear train, and is a crank gear (3c), a first idle gear (3d) meshed with the crank gear (3c), and a first idle gear. The valve drive cam gear (3e), the second idle gear (3f), the third idle gear (3g) meshed with (3d), and the fuel supply pump input gear (3f) meshed with the second idle gear (3f), respectively. 3h) and a PTO input gear (3b) meshed with a third idle gear (3g).
PTO is an abbreviation for power take-off and means power take-off.
A hydraulic pump is used in the PTO drive device (5) shown in FIG. As shown in FIG. 3, the PTO drive device (5) is connected to the transmission cover (3a) via the PTO shaft case (4).

The engine oil in the oil pan (29) shown in FIG. 4 is pumped by an oil pump (not shown) to a sliding portion such as a bearing of the transmission device (3) via an oil gallery (not shown). Although it is supplied, it is cooled by the oil cooler (7) in the middle of the oil gallery and purified by the oil filter (27).

This engine has an intake manifold (21) and an intake manifold (21) assembled on the right side surface of the cylinder head (16), with the horizontal direction orthogonal to the front-rear direction as the left-right lateral direction, as shown in FIGS. It is equipped with an intake throttle (22) assembled at the intake inlet of the above, a common rail (23) erected on the right side of the cylinder head cover (17), and a fuel supply pump (24) arranged on the right side of the cylinder block (15). As shown in FIG. 5, an exhaust manifold (25) assembled on the left side surface of the cylinder head (16) and a supercharger (26) assembled at the exhaust outlet of the exhaust manifold (25) are provided.

The fuel supply device of this engine is a common rail type fuel injection device including a fuel supply pump (24) and a common rail (23) shown in FIGS. 3 and 4.
The intake device of this engine includes an air cleaner (not shown), an air compressor (26a) of a supercharger (26) shown in FIGS. 4 and 5, an intake throttle (22) shown in FIGS. 3 and 4, and an intake manifold. (21) is provided.
The exhaust device of this engine includes an exhaust manifold (25) shown in FIG. 5, an exhaust turbine (26b) of a supercharger (26), and an exhaust treatment device (28). The exhaust treatment device (28) houses the DOC (not shown) and the DPF (not shown) in the exhaust treatment case (28a). DOC is an abbreviation for diesel oxidation catalyst, and DPF is an abbreviation for diesel particulate filter.

As shown in FIGS. 1A and 2, in this engine, the cylinder head cover (17) and the connector (8a) of the fuel injector (8) projecting upward from the ceiling wall (17a) of the cylinder head cover (17). It has.
As shown in FIGS. 1A and 2, this engine has a ceiling wall portion (17b) of a cylinder head cover (17) around a connector (8a) and a spacer (17b) attached to the ceiling wall portion (17b). It is equipped with a 9) and a breather valve (10).
The spacer (9) includes a mounting portion (9a) mounted on the ceiling wall portion (17b) of the cylinder head cover (17) and an eaves portion (9b) that covers the connector (8a) from above. A breather valve (10) is provided in 9b).

With the above configuration, as shown in FIGS. 1A and 2, the spacer (9) includes an eaves portion (9b) that covers the connector (8a) from above, so that the cylinder head cover (17) is used during maintenance. When a tool, a part, or the like is dropped above, the falling object is received by the eaves portion (9b), and the connector (8a) of the fuel injector (8) can be protected from the collision of the falling object.

This engine has four cylinders, is equipped with four fuel injectors (8) arranged in the front-rear direction, and as shown in FIG. 2, the eaves portion (9b) of the spacer (9) is arranged second from the front. The connector (8a) of the two-cylinder fuel injector (8) is covered from above. A power supply cable for the solenoid valve of the fuel injector (8), a control signal cable, and the like are connected to the connector (8a).
The cylinder head cover (17) and the spacer (9) shown in FIGS. 1 (A) and 2 are all made of die-cast aluminum. The cylinder head cover (17) may be made of synthetic resin. The spacer (9) may be cast iron.

As shown in FIG. 1A, the breather valve (10) is a diaphragm valve and is urged in the valve closing direction by the urging force of the valve spring (10b). The valve port (10a) of the breather valve (10) shown in FIGS. 1 (A) and 1 (B) passes through the blow-by gas relay path (10f) shown in FIG. 1 (A) and the blow-by gas outlet pipe (10c). It communicates with the intake inlet pipe (26aa) of the air compressor (26a) of the supercharger (26) shown in FIG. The blow-by gas relay path (10f) is an elbow-shaped passage provided in the spacer (9), and communicates the valve port (10a) and the blow-by gas outlet pipe (10c). As shown in FIG. 1A, the breather valve (10) is covered with a valve cover (10d) from above, and the inside of the valve cover (10d) is an atmospheric pressure chamber (10e).

The breather valve (10) shown in FIG. 1 (A) is a valve opening force generated by the urging force of the valve spring (10b), the valve closing force consisting of the combined force of the intake negative pressure and the atmospheric pressure, and the internal pressure of the crank chamber (not shown). It is opened and closed by a force that is disproportionate to the force. That is, when the internal pressure of the crank chamber rises due to the generation of blow-by gas (12) and the valve opening force of the breather valve (10) exceeds the valve closing force, the breather valve (10) opens and the blow-by gas (12) opens. ) Is the air of the supercharger (26) shown in FIG. 2 from the crank chamber through the cylinder head cover (17), the valve port (10a), the blow-by gas relay path (10f), and the blow-by gas lead-out pipe (10c) in this order. It is introduced into the intake inlet pipe (26aa) of the compressor (26a). The intake negative pressure applied to the breather valve (10) is generated by the suction force in the intake inlet pipe (26aa).

As shown in FIG. 1 (A), the spacer (9) is a communication passage (9c) that communicates the inside of the cylinder head cover (17) with the valve port (10a) of the breather valve (10), and FIGS. 1 (A) to 1 (A). As shown in (C), a heat insulating space (9d) arranged around the communication passage (9c) is provided.
According to the above configuration, as shown in FIGS. 1A to 1C, it is difficult for the communication passage (9c) to be cooled by the surrounding cold air due to the heat insulation of the heat insulation space (9d). Moisture in the blow-by gas (12) passing through the passage (9c) is unlikely to freeze, and the continuous passage (9c) is unlikely to be blocked by freezing.

As shown in FIG. 1 (A), the inside of the cylinder head cover (17) and the communication passage (9c) communicate with each other by a blow-by gas introduction path (17c). The blow-by gas introduction path (17c) is provided in the ceiling wall portion (17b) of the cylinder head cover (17).
The blow-by gas introduction path (17c) is substantially vertical, and a rubber cylinder (17ca) is attached to the inlet at the lower end.
As shown in FIG. 1 (A), the communication passage (9c) is led out diagonally upward from the outlet at the upper end of the blow-by gas introduction path (17c), and faces the breather valve (10) from diagonally below.

The blow-by gas (12) shown in FIG. 1 (A) passes through the blow-by gas introduction path (17c) and the communication passage (9c), collides with the breather valve (10), and leads out the blow-by gas to the valve port (10a). It passes through the pipe (10c) and is introduced into the intake inlet pipe (26aa) of the air compressor (26a) of the supercharger (26) shown in FIG.
In the process, the oil mist contained in the blow-by gas (10) is present on the inner peripheral surface of the blow-by gas introduction path (17c) and the communication passage (9c), the lower surface of the breather valve (10), and the opening peripheral edge of the valve port (10a). Agglomerates on the inner peripheral surface of the blow-by gas outlet pipe (10c) and separates the oil.

As shown in FIGS. 1B and 2, the heat insulating space (9d) is arranged at the blowing position of the engine cooling air (11a).
According to the above configuration, it is difficult for the communication passage (9c) to be cooled by the engine cooling air (11a) due to the heat insulation of the heat insulation space (9d) shown in FIGS. Moisture in the blow-by gas (12) passing through 9c) is unlikely to freeze, and the communication passage (9c) is unlikely to be blocked due to freezing.
The engine cooling air (11a) is generated by the engine cooling fan (11) shown in FIG.

As shown in FIG. 2, the engine is provided with a supercharging pipe (26c) and is arranged at a position where the spacer (9) blocks the engine cooling air (11a) toward the supercharging pipe (26c).
With the above configuration, the engine cooling air (11a) directed to the supercharging pipe (26c) shown in FIG. 2 is blocked by the spacer (9), and the intake air passing through the supercharging pipe (26c) is blocked by the engine cooling air (11a). Since it is difficult to cool, the intake air temperature in cold weather is relatively high, and the engine cold startability is high.
Further, according to the above configuration, the dust flying by the engine cooling air (11a) shown in FIG. 2 is blocked by the spacer (9) and is unlikely to collect in the gap between the supercharging pipe (26c) and the cylinder head cover (17).

(8) ... Fuel injector, (8a) ... Connector, (9) ... Spacer, (9a) ... Mounting part, (9b) ... Eaves part, (9c) ... Communication passage, (9d) ... Insulated space, (10) ) ... Breather valve, (11a) ... Engine cooling air, (11b) ... Air passage, (16) ... Cylinder head, (17) ... Cylinder head cover, (17a) ... Ceiling wall, (17b) ... Ceiling wall part, ( 26c) ... Supercharged pipe.

Claims (4)

In an electronically controlled engine including a cylinder head cover (17) and a connector (8a) of a fuel injector (8) projecting upward from the ceiling wall (17a) of the cylinder head cover (17).
A ceiling wall portion (17b) of a cylinder head cover (17) around a connector (8a), a spacer (9) attached to the ceiling wall portion (17b), and a breather valve (10) are provided.
The spacer (9) includes a mounting portion (9a) mounted on the ceiling wall portion (17b) and an eaves portion (9b) that covers the connector (8a) from above, and a breather valve (9b) is provided on the eaves portion (9b). An electronically controlled engine characterized in that 10) is provided. In the electronically controlled engine according to claim 1.
The spacer (9) is a communication passage (9c) that communicates the inside of the cylinder head cover (17) with the valve port (10a) of the breather valve (10), and a heat insulating space (9d) arranged around the communication passage (9c). An electronically controlled engine that features. In the electronically controlled engine according to claim 2.
An electronically controlled engine characterized in that the heat insulating space (9d) is arranged at a position where the engine cooling air (11a) is blown. In the electronically controlled engine according to claim 3.
An electronically controlled engine comprising a supercharging pipe (26c) and having a spacer (9) arranged at a position blocking the engine cooling air (11a) toward the supercharging pipe (26c).

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