Patent Application
20050193808
1. Field of the Invention
The present invention relates to a cam shaft intake angle examining device, and more particularly to a diesel engine cam shaft intake angle examining device such that the intake stroke is able to precisely coordinate with different strokes of the engine.
2. Description of Related Art
An engine provides power to vehicle, vessels and aircraft so that all these different transporting bodies are able to move. Based on the fuel consumed, some are gasoline engines and the other diesel engines. Based on the number of strokes each cycle, some engines are four-stroke engines and some two-stroke engines. As is generally known, the four strokes of the engine are intake, compression, explosion and exhaust. Thus, it is to be noted that the intake and exhaust occur at the same time to the diesel engine. Therefore, observation of the activation/deactivation of the intake and the traveling distance of the piston is able to have the intake angle after calculation. However, the current calculation technique is too troublesome and wastes too much time.
The current technique requires the user to rotate the cam shaft first. Since the rotation of the cam shaft drives the piston, observation of the activation/deactivation of the intake angle and measurement of the piston traveling distance is able to have the intake angle. As stated earlier, this technique takes too much time and involves a lot of manual energy.
To overcome the shortcomings, the present invention intends to provide an improved examining device to mitigate the aforementioned problems.
The primary objective of the invention is to provide an improved cam shaft intake angle examining device to fast measure the intake angle so as to save time and manual energy.
Another objective of the invention is that during the measurement of the intake angle, observation of the piston movement is able to fix the intake angle to coordinate with the cam shaft rotation.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The base 1 is defined with a fixing recess 12. The fixing recess 12 is so defined that it is adapted to mate with the shape of the cam shaft 41. The base 1 further has a ring 11 with scales that has a prevision of 0.1 degrees. A fixing hole 111 is defined in the ring 11 and a connecting hole 112 is defined in a bottom defining the fixing hole 111 to communicate with the connecting hole 112. A positioning device is provided in the base 1 to fix the engine 4. In this embodiment, the positioning device is a combination of a pressing block and a bolt 13. The pressing block 13 is applied to abut an outer appearance of the engine 4 and then the bolt is supplied to extend through the pressing block and into the base 1 so that the engine 4 to be tested is fixed on the base 1.
The measuring disk 2 includes a rotation disk 21 and a connecting block 22. The rotation disk 21 has a cam shaft hole 211 to correspond to the cam shaft 41. A marking cross 212 is formed on a top face of the rotation disk 21 to coordinate with the scales of the ring 11. A rotation handle 213 is formed on the rotation disk 21 to facilitate the rotation of the rotation disk 21.
The connecting block 22 has a rough surface 220 to increase the friction with the rotation disk 21 such that relative movement between the connecting block 22 and the rotation disk 21 is prevented. The connecting block 22 has a cam shaft fixing ring to adapt to the shape of the engine cam shaft 41. A cam shaft extension hole 221 is defined in the connecting block 22. A circular recess is defined in both sides of the connecting block 22 to mate with the output end 412 of the cam shaft 41.
The adjusting rod 3 is provided to ensure that the tested engine is at the initial position before the test begins. In this embodiment, the initial position is the same as the top dead point of the piston. The adjusting rod 3 is a rod with different diameters. The adjusting rod 3 has a first end 31 with a diameter the same as that of the piston of the engine 4 in question. The first end 31 has a recess 311 corresponding to the linkage pin. A contacting face 312 is formed adjacent to the recess 311. A second end 32 is formed opposite to the first end 31 for easy holding of the adjusting rod 3.
Before the test starts, it is to be noted that the hull of the engine 4 is to be used so that only the hull and the cam shaft 41 of the engine 4 are left for test. With reference to
Adjusting the rotation disk 21 to allow the marking cross 212 aligned with the ring scale initial point. Then a nut (not numbered) is supplied to secure the output end 412 and thus the connecting block 22 is secured on the rotation disk 21. Therefore, the cam shaft 41, the connecting block 22 and the rotation disk 21 are able to move simultaneously. With reference to
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
