Diesel engine test bench

Abstract

A diesel engine test bench structurally comprises a base, and a load device and a transverse sizing block are fixedly connected to the base. Two adjusting supports are fixed by each transverse sizingblock and are in one-to-one correspondence with mounting feet of the diesel engine; the adjusting support comprises a support frame and an adjusting device; an adjusting device is arranged in the support frame and sequentially provided with a threaded sleeve, a fixing nut, a nut seat and a positioning pin from top to bottom. Right-handed internal threads are arranged on the inner wall of the threaded sleeve, the outer wall of the pipe is divided into two sections, the upper section is hexagonal and can extend out of the through hole of the support frame, and the lower section is round and provided with left-handed external threads. The fixing nut is provided with a left-hand internal thread, and the fixing nut and the left-hand external thread of the threaded sleeve form a thread pair. Thefixing nut is fixedly connected to the nut seat; and the nut seat is positioned by a positioning pin and is fixedly connected with the support frame. By means of the adjusting supporting effect of the adjusting support, the diesel engine test installation requirement is met, and meanwhile installation screws can be effectively prevented from loosening.

Description

technical field [0001] The invention relates to a diesel engine test bench, in particular to a lifeboat diesel engine test bench, which belongs to the technical field of diesel engine production technology. Background technique [0002] Before leaving the factory, marine diesel engines need to be run-in, debugged and other test items. Therefore, it is necessary to install the diesel engine on the test bench. The test bench is usually on a base with a longitudinal T-shaped slot, and two transverse pad irons and a load device are respectively fixed through T-shaped bolts; There is a support frame on the iron. Before the test run of the diesel engine, the diesel engine and the load device are elastically connected through an elastic coupling, and then the mounting feet of the diesel engine are connected to the support frame with screws. As we all know, the diesel engine has four independent rigid mounting feet, which are rigidly connected with the diesel engine. In theory, in ...

AI Technical Summary

Problems solved by technology

As we all know, the diesel engine has four independent rigid mounting feet, which are rigidly connected with the diesel engine. In theory, in the height direction, the height of the bottom plane of each mounting foot to the centerline of the crankshaft of the diesel engine is consistent, that is, the four mounting feet The bottom plane of the feet is theoretically on the same plane. In fact, due to manufacturing errors, positioning errors, and assembly errors, the bottom planes of the four mounting feet are not a plane, but there is a slight error, although it does not affect the diesel engine and the load device. Connection accuracy, but the diesel engine mounting feet and the support frame are fixed and connected by screws, usually there will be three situations, the first and four mounting feet cannot be effectively supported on the corresponding support frame at the same time; second, the pressing point of the mounting screw There is no space between the mounting feet at the place and the support frame; third, the mounting screws are easy to loosen

[0003] In the first case, the four mounting feet cannot be effectively supported on the corresponding support frame at the same time; the bottom surface of the mounting foot is supported on the support frame at three points, that is to say, there are only three (or two) diesel engine mounting feet at the same time It is supported on the corresponding support frame, thus causing the center of gravity of the diesel engine to be unstable. During the test run of the diesel engine, vibration and noise will be generated. In severe cases, the mounting feet will break. In order to ensure that the four mounting feet of the diesel engine can be effectively supported at the same time, Usually, gaskets are plugged under the suspended mounting feet. Since the suspended heights of the mounting feet of each diesel engine are different, and the thickness specifications of the gaskets are limited, it is difficult to completely eliminate the gap between the mounting feet and the support frame by this method, so that it cannot Effectively overcome the vibration and noise caused by the installation of the diesel engine

[0004] In the second case, the space between the mounting foot at the pressing point of the mounting screw and the support frame is empty; because the bottom surface of the mounting foot is in contact with the support frame, usually point (or line) contact, it is difficult to achieve surface contact, that is, the installation A point (or line) on the edge of the plantar surface rests on the upper plane of the stand

Therefore, the compression point of the screw does not coincide with the support point, so that the mounting foot will generate additional torque under the action of the screw compression force, which will affect the service life

[0005] In the third case, the mounting screws are easy to loosen

The mounting feet are installed on the support frame with screws. Since the diesel engine vibrates greatly during operation, the screws are easy to loosen. Usually, elastic gaskets are used to loosen the screws, but the effect is not ideal. Especially when the diesel engine is used for durability tests, it is necessary to check whether the screws are loose to avoid accidents

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