JPH10159578A - Auxiliary machine mounting and driving mechanism of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost of each gear of a gear train, reduce moment of inertia and increase torsional natural frequency by forming instration seats on a gear case and a separate case, installing auxiliary machines in the instration seats and constituting the separates case so that it may be freely attachable/ detachable by itself. SOLUTION: Auxiliary machines installed in an internal combustion engine are arranged on a non-steering side end part of a gear case 7, a plurality of sheets of cam idle gears 27.28 of a gear train are arranged on the non-steering side of a crank shaft 25 and the cam idle gears 27.28 are applied as driving idle gears of the auxiliary machines. The axualiry machines are installed in instration seats which are formed on separate cases 23.24 arranged on the non-steering surface of the gear case 7 and a pump block. The separate 23.24 are constituted so that they may be freely attachable/detachable by themselves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive mechanism for mounting auxiliary equipment such as a pump attached to a gear case of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a gear case is attached to one side of an internal combustion engine (engine), and auxiliary equipment such as a cooling water pump or a lubricating oil pump is attached to the gear case. The rotation of one interposed idle gear or one two-stage idle gear is transmitted to an auxiliary machine through a drive idle gear between the idle gear and a drive gear of the auxiliary machine. Is known. For example, as shown in FIG. 6, a cam idle gear 27 'is interposed between a crankshaft gear 26 fixed to the crankshaft 25 and the camshaft gear 31 to form a gear train. The gear case 7 'includes a cooling water pump mounting seat 23a'.
A lubricating oil pump mounting seat 24a 'is formed, and a cooling water pump and a lubricating oil pump are mounted on the mounting seats 23a' and 24a '.

A drive idle gear 35 meshes with the cam idle gear 27 'to rotate the cam idle gear 27' from the drive idle gear 35 to form a two-stage cooling water pump idle gear 29/30. Through the cooling water pump driving gear 20a to drive the cooling water pump. In addition, the rotation of the cam idle gear 27 'is transmitted to the lubricating oil pump driving gear 21a via the driving idle gear 36 meshed with the cam idle gear 27' to drive the lubricating oil pump. In this manner, the cam idle gear 27 'constituting the gear train is provided as a single sheet, and the drive idle gears 35 and 36 are provided separately from the cam idle gear 27'.
It was arranged at an appropriate position around a.21a.

[0004]

However, in the above-described accessory drive mechanism, the gear case cover and the like are disassembled when the drive gear of the accessory is inspected or the accessory is removed. It was necessary to remove them in the direction of the crankshaft, which was troublesome and required a lot of space in the direction of the crankshaft. In addition, since there is only one cam idle gear 27 'forming a gear train for transmitting the rotation of the crankshaft to the camshaft gear, especially in a low-speed long-stroke engine in which the distance between the crankshaft and the camshaft is large. Thus, it is necessary to use large-diameter gears for the crankshaft gear, camshaft gear, and cam idle gear constituting the gear train. As a result, the cost of gears and the like and the moment of inertia increase,
In addition, problems such as a decrease in the natural frequency of torsion occurred.

[0005]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, the auxiliary machine is disposed at the non-steering-side end of the gear case, and a gear train for transmitting the rotation of the crankshaft to the camshaft is constituted by a crankshaft gear, a camshaft gear, and a plurality of cam idle gears, The cam idle gear is arranged on the non-steering side of the crankshaft, the cam idle gear also acts as a drive idle gear of the auxiliary machine, and a separate case is arranged on the non-steering surface of the gear case, And the separate case are provided with a mounting seat, the auxiliary machine is installed on the mounting seat, and the separate case is independently detachable.

[0006]

Next, an embodiment of the present invention will be described. FIG. 1 is a partial front (non-steering side) view showing a mounted state of a cooling water pump and a lubricating oil pump, FIG. 2 is a partial side view of the same, and FIG. 3 shows a driving force transmission mechanism to the cooling water pump and the lubricating oil pump. FIG. 4 is a partial side view showing a mounting state of a pump drive gear and a separate case, and FIG.
FIG. 6 is a partial front view (non-steering side view), and FIG. 6 is a side sectional view showing a driving force transmission mechanism to a conventional cooling water pump and a lubricating oil pump.

First, the schematic structure of the engine E will be described with reference to FIG. The engine E according to the embodiment of the present invention is a type mounted on a hull or the like, and has a cylinder head Eb mounted on a cylinder block Ea in which a plurality of (six in this embodiment) cylinders are provided in a row. , Constituting the engine body. The rear side of the engine E forms a control side when the operator performs an operation on the machine side (apart from remote control), and the front side defines a non-control side on which the operator does not stand during normal operation. Has formed. An intercooler 6 is disposed above the gear case 7 via an intercooler mount 5.

Next, a description will be given of a drive mechanism for mounting the cooling water pump 20 and the lubricating oil pump 21 disposed on the gear case 7. As shown in FIGS. 1 and 2, a cooling water pump 20 and a lubricating oil pump 21 are provided at the front end (non-steering side) of the gear case 7. A cooling water pump separate case 23 and a lubricating oil pump separate case 24 are attached to the non-steering side surface of the gear case 7, and a cooling water pump 20 extends across the cooling water pump separate case 23 and the gear case 7. Installed, separate lubricant oil pump case 24 and gear case 7
And a lubricating oil pump 21 is provided.

In FIG. 3, a first cam idle gear 27 and a second cam idle gear 28 are interposed between a crankshaft gear 26 fixed to a crankshaft 25 and a camshaft gear 31, and 25 to reduce the camshaft gear 3
To one. The first and second cam idle gears 27
The reference numeral 28 is disposed on the non-steering side of the crankshaft gear 26 and the camshaft gear 31. 1st cam idle gear 2
Reference numeral 7 denotes a lubricating oil pump 2 which meshes with a lubricating oil pump driving gear 21a disposed at the front side (non-steering side) end of the gear case 7.
1 and the second cam idle gear 28 is driven through the cooling water pump idle gears 29 and 30 configured as two gears.
The cooling water pump 20 is driven by transmitting rotation to a cooling water pump driving gear 20 a disposed at the front side (non-steering side) end of the gear case 7.

As described above, the first and second cam idle gears 27 and 28 are connected to the crankshaft gear 26 and the camshaft gear 31.
By disposing the rotation of the crankshaft 25 to the camshaft gear 31 and disposing the gearcase 7
Water pump 20 arranged at the front (non-steering side) end of the pump
The drive of the lubricating oil pump 21 can be performed without the drive idle gear which has been required conventionally. Also, since the cam idle gear is composed of two sheets, the first cam idle gear 27 and the second cam idle gear 28,
Crankshaft gear 26 and first and second cam idle gears 27
The rotation of the crankshaft 25 can be transmitted to the camshaft gear 31 even if all of the gears 28 and the camshaft gear 31 are formed to have a small diameter. As a result, the cost of each gear and the moment of inertia can be reduced, and the torsional natural frequency can be increased.

As shown in FIGS. 4 and 5, the cooling water pump driving gear 20a and the lubricating oil pump driving gear 21a are disposed at the non-steering-side end of the gear case 7, and a part thereof is formed in the gear case. 7 protrudes outside from the non-control side end.
Further, a separate cooling water pump case 23 and a separate lubricating oil pump case 24 are attached to the non-steering side surface of the gear case 7, and incorporate the cooling water pump driving gear 20a and the lubricating oil pump driving gear 21a. I have.

A cooling water pump mounting seat 23a is formed on the side surface of the separate cooling water pump case 23, and a cooling water pump mounting seat 7a is formed on the gear case 7.
-The cooling water pump 20 is installed at 23a. Also,
A lubricating oil pump mounting seat 24a is formed on the side surface of the separate lubricating oil pump case 24, and a lubricating oil pump mounting seat 7b is formed in the gear case 7. The lubricating oil pump 21 is mounted on both mounting seats 7b and 24a. Is installed. Cooling water pump 20
And the lubricating oil pump 21 is connected to the gear case 7 and the separate case 2
3 and 24, the separate case 23.
24 is configured to be independently detachable.

With the above configuration, the driving gear 20
Inspection of gears such as a.21a and cam idle gears 27 and 28 can be performed by removing only the separate cases 23 and 24 from the non-control side, and by removing the separate cases 23 and 24, the cooling water pump can be checked. 20 and lubricating oil pump 21
Can be easily removed from the non-steering side. This makes it possible to easily check the gears and remove the pump without any trouble, and it is not necessary to provide a large space for inspection and removal in the direction of the crankshaft.

[0014]

As described above, the present invention has the following advantages. That is, the auxiliary machine is disposed at the non-steering-side end of the gear case, and a gear train for transmitting the rotation of the crankshaft to the camshaft is constituted by a crankshaft gear, a camshaft gear, and a plurality of cam idle gears, The cam idle gear is arranged on the non-steering side of the crankshaft, the cam idle gear also acts as a drive idle gear of the auxiliary machine, and a separate case is arranged on the non-steering surface of the gear case, And the separate case are formed with a mounting seat, and the auxiliary device is installed on the mounting seat, and the separate case is configured to be detachable independently, so that cost reduction and inertia of each gear of the gear train are achieved. The moment was reduced, and the torsional natural frequency was increased. In addition, gear check and pump removal can be done easily without much effort,
It is no longer necessary to provide a large space for inspection and removal in the direction of the crankshaft.

[Brief description of the drawings]

FIG. 1 is a partial front view (non-steering side view) showing a mounted state of a cooling water pump and a lubricating oil pump.

FIG. 2 is a partial side view of the same.

FIG. 3 is a side sectional view showing a driving force transmission mechanism to a cooling water pump and a lubricating oil pump.

FIG. 4 is a partial side view showing a mounting state of a pump drive gear and a separate case.

FIG. 5 is a partial front view (non-steering side view).

FIG. 6 is a side sectional view showing a conventional driving force transmission mechanism for a cooling water pump and a lubricating oil pump.

[Explanation of symbols]

 E engine Ea cylinder block 5 intercooler mounting base 6 intercooler 7 gear case 7a / 23a cooling water pump mounting seat 7b / 24a lubricating oil pump mounting seat 20 cooling water pump (auxiliary equipment) 20a cooling water pump drive gear 21 lubricating oil pump (Auxiliary equipment) 21a Lubricating oil pump drive gear 25 Crankshaft 26 Crankshaft gear 27/28 Cam idle gear 29/30 Cooling water pump idle gear 31 Camshaft gear

Claims (2)

[Claims] 1. A gear train for mounting an accessory attached to a gear case of an internal combustion engine, wherein the accessory is disposed at a non-steering-side end of the gear case and transmits rotation of a crankshaft to a camshaft. Is composed of a crankshaft gear, a camshaft gear, and a plurality of cam idle gears, and the cam idle gear is arranged on the non-steering side of the crankshaft, and the cam idle gear may be used as a drive idle gear of the auxiliary machine. An accessory mounting drive mechanism for an internal combustion engine, wherein the drive mechanism is operated. 2. The accessory mounting drive mechanism according to claim 1, wherein a separate case is disposed on the non-steering side of the gear case, and a mounting seat for mounting the accessory on the gear case and the separate case is formed. The accessory mounting drive mechanism for an internal combustion engine, wherein the accessory is installed on the mounting seat, and the separate case is configured to be detachable independently.