JP2000186564A - Timing transmission device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device to use a high pressure fuel injection pump and be used by reducing weight when the injection pump is diverted to a low pressure fuel injection pump. SOLUTION: In a timing transmission device for an engine, a reinforcing plate 7 is provided. The reinforcing plate 7 is formed in a manner to provide rigidity higher than that of a gear case 1 and fixed at the gear case 1 by a reinforcing plate mounting bolt 6, and a fuel injection pump 4 is fixed at the reinforcing plate 7 by a pump mounting bolt 8. Thus, when a high pressure fuel injection pump 4 is used, a drive reaction force exerted on the fuel injection pump 4 is firmly received by the reinforcing plate 7, whereby vibration of the fuel injection pump 4 is suppressed. Thereby, the occurrence of a problem on the damage of a timing gear train 3 and a deviation of an injection timing is suppressed. Further, when the high pressure fuel injection pump is diverted to a device for a low pressure fuel injection pump, the device is used with weight reduced when the reinforcing plate 7 is not mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing transmission for an engine and, more particularly, to a high-pressure fuel injection pump which can be used, and which is lightweight when used for a low-pressure fuel injection pump. The present invention relates to a material that can be used as a material.

[0002]

2. Description of the Related Art Conventionally, as a timing transmission of an engine,
A gear case, a case lid, a timing gear train, and a fuel injection pump, wherein the gear case is mounted on a crankcase, the case cover covers an opening of the gear case, and the timing gear train is housed in the gear case. is there. In this conventional device, the fuel injection pump is
It is fixed to the gear case with pump mounting bolts.

[0003]

The above prior art has the following problems. When a high-pressure fuel injection pump is used, the vibration of the fuel injection pump increases because the rigidity of the gear case is lower than the driving reaction force received by the fuel injection pump. For this reason, problems such as damage to the gears of the timing gear train and deviation of the injection timing occur. In order to avoid this problem, if a thick and highly rigid gear case is used, the device becomes unnecessarily heavy when converted to a device for a low-pressure fuel injection pump.

An object of the present invention is to provide a timing transmission for an engine, in which a high-pressure fuel injection pump can be used, and when it is diverted to a device for a low-pressure fuel injection pump, it is reduced in weight. It is to provide what can be done.

[0005]

The structure of the first aspect of the present invention is as follows. As shown in FIG. 1, the gear case
(1), a case lid (2), a timing gear train (3), and a fuel injection pump (4). The gear case (1) is mounted on a crankcase (5) as shown in FIG. 3 or FIG. As shown in FIG. 1, the case lid (2) is
The timing gear train (3) covers the opening of (1), and the timing gear train (3) is housed in the gear case (1). In the timing transmission of the engine, as shown in FIGS. The reinforcing plate (7) is configured to have higher rigidity than the gear case (1), and is fixed to the gear case (1) by a reinforcing plate mounting bolt (8). (4) Use the pump mounting bolt (8) and the reinforcing plate (7)
Characterized in that it is fixed to

[0006]

Operation and Effect of the Invention (Invention of claim 1) The invention of claim 1 has the following operation and effects. As shown in FIG. 1, when a high pressure fuel injection pump (4) is used, the fuel injection pump
Since the reinforcing plate (7) firmly receives the driving reaction force received by (4), the vibration of the fuel injection pump (4) can be suppressed. Therefore, problems such as damage to gears of the timing gear train (3) and deviation of injection timing can be suppressed. Further, when diverted as a device for a low-pressure fuel injection pump, the device can be reduced in weight and used without a reinforcing plate (7).

(Invention of claim 2) The invention of claim 2 has the following effect in addition to the effect of the invention of claim 1.
As shown in FIG. 1, the timing gear train (3) includes an idle gear (9), and a bearing boss of the idle gear (9).
(11) has the following advantages because it is fixed to the reinforcing plate (7) by the boss mounting bolt (13). Even if a high-pressure fuel injection pump (4) is used, the reinforcing plate (7) firmly receives the driving reaction force received by the idle gear (9).
The vibration of (9) can be suppressed. Therefore, the timing gear train
Problems (3) such as gear damage and shift in injection timing can be suppressed.

(The invention of claim 3) The invention of claim 3 has the following effect in addition to the effect of the invention of claim 2.
As shown in FIG. 1, the bearing boss (11) is provided with an interlocking shaft insertion boss hole (12) for an auxiliary device. Therefore, when the auxiliary device is attached, the idle gear (9) is connected to the auxiliary device. It can also be used as a gear, reducing the number of parts.

(Invention of claim 4) The invention of claim 4 has the following operation and effect in addition to the operation and effect of any one of claims 1 to 3. Since the reinforcing plate (7) is made of a different material from the gear case (1), resonance between the gear case (1) and the reinforcing plate (7) can be avoided, and vibration noise can be reduced.

(Invention of claim 5) The invention of claim 5 has the following operation and effect in addition to the operation and effect of any one of the inventions of claims 1 to 4. As shown in FIG. 5, the gear case (1)
Is provided with an interlocking shaft insertion port (14) for auxiliary equipment.
(14) has the following advantages because it is closed by the reinforcing plate (7). Since the reinforcing plate (7) also serves as the lid of the interlocking shaft insertion opening (14), the number of parts can be reduced. Further, since the reinforcing region of the gear case (1) by the reinforcing plate (7) is widened, the vibration of the gear case (1) can be suppressed, and the vibration noise can be reduced.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 4 are views for explaining a first embodiment of the present invention. In the first embodiment, a vertical multi-cylinder diesel engine is used.

As shown in FIGS. 3 and 4, the engine includes a cylinder block (18), a cylinder head (19), an oil pan (31), and a timing transmission (20). The cylinder block (18) includes a crankcase (5). The cylinder head (19) is mounted on the upper part of the cylinder block (18). Oil pan (3
1) is assembled to the lower part of the cylinder block (18). The timing transmission (20) is connected to the cylinder block (1).
8) Installed at the front.

The structure of the timing transmission (20) is as follows. As shown in FIG. 1, the timing transmission (20) includes a gear case (1), a case lid (2), a timing gear train (3), and a fuel injection pump (4). As shown in FIG.
The gear case (1) is attached to the crankcase (5) and includes a portion (1a) in contact with the crankcase (5) and a portion (1b) not in contact with the crankcase (5). The portion (1b) not in contact with the crankcase (5) is disposed in front of the side space of the crankcase (5) and is in contact with the crankcase (5).
It protrudes laterally from (1a). The gear case (1) has an open front surface. As shown in FIG. 4, the case cover (2) covers the entire opening of the gear case (1).

As shown in FIG. 3, a timing gear train (3)
Has a crank gear (21), a first idle gear (22), a second idle gear (9), a fuel injection cam gear (23), a valve gear cam gear (24), and an auxiliary gear interlocking gear (25). As shown in FIG. 1, the second idle gear (9) has a gear shaft (17), which is supported by a bearing boss (11). The bearing boss (11) includes a flange (27), and the flange (27) includes a boss mounting bolt (13) and a fastening bolt (28).

As shown in FIG. 1, the fuel injection cam gear (2)
3) is fixed to the fuel injection cam shaft (16) of the fuel injection pump (4). As shown in FIG. 3, the fuel injection cam gear
(23) is the first idle gear from the crank gear (21).
(22) and the second idle gear (9) are sequentially linked. The same applies to the auxiliary gear interlocking gear (25). Valve gear cam gear
(24) is the first idle gear from the crank gear (21).
Linked via (22). In the timing gear train (3), the gears other than the crank gear (21) are the gear case (1).
Is housed in

As shown in FIG. 3, the crank gear (21)
Is housed in a crank gear housing (26) formed at the front of the crankcase (5). Fuel injection cam gear
(23), second idle gear (9) and auxiliary gear interlocking gear (25)
Is accommodated in a portion (1b) of the gear case (1) that is not in contact with the crankcase (5), and the first idle gear (2)
2) and the valve gear cam gear (24) are of the gear case (1).
It is housed in a portion (1a) in contact with the crankcase (5). The case lid (2) covers all gears of the timing gear train (3).

The fuel injection pump (4) shown in FIG. 1 is of a distribution type and has a flange (10). As shown in FIG. 2, the flange (10) has a long hole (15) and a pump mounting bolt (8), and the long hole (15) is formed in an arc shape centering on the fuel injection cam shaft (16). The pump mounting bolt (8) is inserted through the elongated hole (15). When the fuel injection pump (4) is rotated about the fuel injection cam shaft (16), the fuel injection timing is adjusted. The fuel injection pump (4) is fixed at a predetermined rotation position by a pump mounting bolt (8).

Since a high pressure fuel injection pump (4) is used, as shown in FIGS. 1 and 2, a timing transmission (20) is used.
Has a reinforcing plate (7). The reinforcing plate (7) is made of a different material from the gear case (1). That is,
The gear case (1) is made of an aluminum alloy and has a reinforcing plate (7).
Is made of cast iron. The reinforcing plate (7) is configured to have higher rigidity than the gear case (1), and is fixed to the gear case (1) with reinforcing plate mounting bolts (6). Fuel injection pump (4), pump mounting bolt (8)
And is fixed to the reinforcing plate (7).

The bearing boss (11) of the second idle gear (9)
Penetrates the reinforcing plate (7) and is fixed to the reinforcing plate (7) with boss mounting bolts (13). Also, this bearing boss (11)
Are jointly fastened to the gear case (1) together with the reinforcing plate (7) by means of joint fastening bolts (28). This bearing boss (11)
On the opposite side of the second idle gear (9), the interlocking shaft insertion boss hole
(12) is provided. This interlocking shaft insertion boss hole (12)
It is closed by the boss lid (29). The boss lid (29) is fixed to the bearing boss with the boss mounting bolt (13) and the bolt (28).
It is tightened together with (11). Remove the boss lid (29),
An auxiliary device such as a fuel pump is attached to the bearing boss (11), and the interlocking shaft of the auxiliary device is inserted into the interlocking shaft insertion boss hole (12).
When connected to the gear shaft (17), the second idle gear (9) can also be used as an interlocking gear of the auxiliary device.

As shown in FIG. 2, the gear case (1) has an interlocking shaft insertion opening (14). This interlocking shaft insertion port (14)
Is arranged at a position facing the auxiliary gear interlocking gear (25) shown in FIG. 3, and is closed by a lid (30). As shown in FIG. 4, the case lid (2) also has an interlocking shaft insertion port at a position facing the auxiliary gear interlocking gear (25) shown in FIG. This interlocking shaft insertion port is also a lid
It is blocked by (32). For this reason, an auxiliary device such as an oil pump is attached to at least one of the interlocking shaft insertion opening (14) of the gear case (1) and the interlocking shaft insertion opening of the case lid (2), and these are connected with the auxiliary device interlocking gear (25). Can work together.

In the second embodiment shown in FIG. 5, the reinforcing plate (7)
Is extended and the interlocking shaft insertion port (14) is an extended reinforcing plate
It is blocked by (7). The other configuration is the same as that of the first embodiment. In FIG. 5, the same elements are denoted by the same reference numerals as in FIGS.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a timing transmission according to a first embodiment of the present invention.

FIG. 2 is a rear view of the timing transmission shown in FIG. 1;

FIG. 3 is a front view of an engine provided with the timing transmission shown in FIG. 1;

FIG. 4 is a side view of the engine of FIG. 3;

FIG. 5 is a rear view of a timing transmission according to a second embodiment of the present invention.

[Explanation of symbols]

(1) ... gear case, (2) ... case lid, (3) ... timing gear train, (4) ... fuel injection pump, (5) ... crankcase, (6) ... reinforcing plate mounting bolt, (7) ... reinforcement Plate, (8) Pump mounting bolt, (9) Second idle gear, (11) Bearing boss, (12) Interlocking shaft insertion boss hole, (13) Boss mounting bolt, (14) Interlocking shaft Insertion opening.

Claims (5)

[Claims] 1. A gear case (1), a case lid (2), a timing gear train (3), and a fuel injection pump (4), wherein the gear case (1) is mounted on a crankcase (5), The lid (2) covers the opening of the gear case (1), and the timing gear train (3) is a timing transmission for an engine housed in the gear case (1), which is provided with a reinforcing plate (7). The reinforcing plate (7) is
While being configured to have higher rigidity than (1),
The fuel injection pump (4) is fixed to the gear case (1) with a reinforcing plate mounting bolt (6), and the pump mounting bolt (8)
A timing transmission for an engine, the transmission being fixed to the reinforcing plate (7). 2. The timing transmission of an engine according to claim 1, wherein the timing gear train (3) includes an idle gear (9), and a bearing boss (1) of the idle gear (9).
1) A timing transmission for an engine, which is fixed to the reinforcing plate (7) with a boss mounting bolt (13). 3. An engine timing transmission according to claim 2, wherein said bearing boss (11) is provided with an interlocking shaft insertion boss hole (12) for an auxiliary device. Timing transmission. 4. The timing transmission of an engine according to claim 1, wherein said reinforcing plate is made of a material different from that of said gear case. Engine timing transmission. 5. The timing transmission of an engine according to claim 1, wherein said gear case (1) has an interlocking shaft insertion opening (14) for an auxiliary device, and said interlocking shaft insertion opening.
(14) A timing transmission for an engine, wherein the transmission is closed by the reinforcing plate (7).