JPS6218558Y2 - - Google Patents

Description

[Detailed description of the invention] As shown in Fig. 1, in an internal combustion engine in which a damper b for torsional vibration prevention is attached to the end of a crankshaft a, conventional methods are used to drive auxiliary equipment such as a clean water pump. A pulley d for driving the seawater pump is attached to the front end of an extension shaft c extending from the mounting part of the damper b, and the seawater pumps f and g are driven through a V-belt e installed on the pulley d. It was driving.

However, in the conventional auxiliary drive device as described above, since the seawater pumps f and g are provided in front of the damper b, the overall length of the engine becomes longer, and the overflow of the crankshaft a from the main bearing h increases. As the hanging portion becomes longer, an excessive load is applied to the main bearing h, and the crankshaft a and the extension shaft c are bent and deformed, causing the damper b to become eccentric, which has an undesirable adverse effect on the function of the damper b. Ta.

This proposal relates to an improvement of an auxiliary drive device for an internal combustion engine that eliminates such drawbacks, and in an internal combustion engine in which a damper for preventing torsional vibration is attached to the end of the crankshaft, the damper of the crankshaft and the damper adjacent to the damper are provided. An auxiliary drive gear is installed between the main bearing journal and the damper is driven by the gear to rotate in opposite directions, and the spiral chambers are wound in opposite directions. It is characterized by the installation of two centrifugal pumps, and its purpose is to drive the auxiliary equipment of a compact internal combustion engine that can reliably drive the centrifugal pumps without adversely affecting the damper. The point is to provide equipment.

As described above, this proposal is based on an internal combustion engine in which a damper for torsional vibration prevention is attached to the end of the crankshaft.
An auxiliary drive gear is installed between the damper of the crankshaft and a main bearing journal adjacent to the damper,
Two volute pumps, which are driven by the gear and rotated in opposite directions and whose volute chambers are wound in opposite directions, are disposed on the sides of the damper, so that the internal combustion engine When the operation starts, the two centrifugal pumps are rotationally driven in respective specified directions via the auxiliary drive gear.

Further, in the present invention, the auxiliary drive gear is installed between the damper of the crankshaft and the main bearing journal adjacent to the damper, and the auxiliary drive gear is attached when driving the two centrifugal pumps. The bending moment to the crankshaft due to the load applied to the machine drive gear is reduced, the eccentricity of the torsional vibration prevention damper is reduced compared to the conventional damper, and the adverse effect on the damper due to eccentricity is reduced. .

Furthermore, in the present invention, the two centrifugal pumps can be disposed close to the crankshaft so that the outlets of the two centrifugal pumps are both on the outside, and the two centrifugal pumps can be disposed close to each other on the crankshaft without extending the crankshaft. Since the auxiliary drive gear can be mounted on the crankshaft close to the main bearing journal, the overall length and width of the engine can be reduced to make the engine compact.

The present invention will be explained below with reference to the embodiment shown in FIGS. 2 and 3. Reference numeral 1 denotes a crankshaft. A damper 2 for preventing torsional vibration is fitted to the front end of the crankshaft 1, and the crankshaft 1 is rotatable by a main bearing 3. is supported by.

Further, an auxiliary drive gear 4 is integrally mounted on the crankshaft 1 between the torsional vibration damper 2 and the main bearing 3.

Further, two volute pumps 5 and 6, each having a volute chamber wound in opposite directions such that the volute chamber outlet is directed outward and upward, are disposed at symmetrical positions below the crankshaft 1. A seawater pump 6, which is a pump 6, is connected to an auxiliary drive gear 4 via an idler gear 7, and a freshwater pump 5, which is a centrifugal pump 5, is connected to the idler gear 7 via an idler gear 8.

Since the embodiment shown in FIGS. 2 and 3 is configured as described above, when the crankshaft 1 rotates clockwise in FIG.
is driven clockwise, the fresh water pump 5 is driven counterclockwise, and both the centrifugal pumps 5 and 6 are operated normally.

Furthermore, in the embodiment described above, since the auxiliary drive gear 4 is placed inside the damper 2, the overall length of the engine is shortened.

Furthermore, by arranging two volute pumps 5 and 6 whose volute chambers are wound in opposite directions to each other at symmetrical positions below the crankshaft 1 on the outside of the damper 2, the outlet of the volute chamber is made to the outside. Therefore, the pump body can be brought closer to the center of the crankshaft 1, and the engine width can be narrowed to make it more compact.

Furthermore, since the point of application of the bending moment applied to the crankshaft 1 when the centrifugal pumps 5 and 6 are driven is located at the auxiliary drive gear 4 between the damper 2 and the main bearing 3, the crankshaft 1 The bending moment of the crankshaft 1 is reduced, the bending deformation of the crankshaft 1 is reduced compared to the conventional crankshaft, and the adverse effect on the damper 2 is greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a conventional internal combustion engine auxiliary drive device, FIG. 2 is a front view illustrating an embodiment of the internal combustion engine auxiliary drive device according to the present invention, and FIG. FIG. 3 is a longitudinal side view taken along a line. 1... Crankshaft, 2... Torsional vibration damper, 3
...Main bearing, 4...Auxiliary drive gear, 5, 6...
Centrifugal pump, 7, 8...Idler gear.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine in which a damper for preventing torsional vibration is attached to the shaft end of the crankshaft, an auxiliary drive gear is attached between the damper of the crankshaft and a main bearing journal adjacent to the damper, and an auxiliary drive gear is attached to the side of the damper. , an auxiliary equipment drive device for an internal combustion engine, characterized in that two volute pumps are provided which are driven by the gear and rotated in opposite directions, and whose volute chambers are wound in opposite directions. .