Patent description diesel engine mechanical tachometer device
Technical field
The utility model relates to a diesel engine mechanical tachometer device. It is mainly used to monitor and display the current working speed of the engine.
technical background
At present, the monitoring shows that the non-contact electronic tachometer system is widely used in diesel engine speed. The non-contact electronic tachometer system is easy to install and simple in structure, but all inductive sensors need to provide 24V voltage to work. If the diesel engine is to work in a fire-proof and explosion-proof high-risk place, it is not allowed to operate with electricity when using the diesel engine, so the non-contact electronic tachometer system cannot be used.
Summary of the invention
[0003] The purpose of the utility model is to provide a mechanical tachometer device with reasonable structure and simple installation, which can meet the use requirements of diesel engines under any circumstances.
[0004] The technical scheme of the utility model is that the mechanical tachometer device of the diesel engine is: the power take-off joint is a shaft with a nut at one end and a key at the other end, the shaft end of the power take-off joint is connected to the input port of a right-angle converter, the output port of the right-angle converter is connected to one end of a transmission flexible shaft, and the other end of the transmission flexible shaft is connected to the mechanical tachometer.
[0005] In the technical scheme of the utility model, the outer circumference of the power take-off joint is provided with a disc-shaped power take-off end cover for fixing the right-angle converter, one end of the power take-off end cover is connected with a pressure plate on the right-angle converter through a threaded hole on its step, and the other end of the power take-off end cover extends out of a shaft with external threads, and the external threaded shaft is matched with the threaded hole on the front gear chamber wall of the engine.
[0006] In the technical scheme of the utility model, the nut on the power take-off joint is a hexagonal countersunk groove, and its inner cavity is matched with the size of the fixed nut of the driving gear of the fuel pump.
[0007] The right-angle converter described in the technical scheme of the utility model is a steering device with an input port and an output port, and transmits power torque through a 90-degree gear.
[0008] The utility model uses the fixed nut of the driving gear of the fuel pump in the front gear room of the engine as the connecting power output point, and makes a power output joint which can transmit torque and is sleeved on the nut. The second half of the power take-off joint is directly clamped at the torque input port of the right-angle converter by shaft extension and integrated force transmission shaft, and the right-angle converter changes the transmission torque transmitted by the power take-off joint by 90 degrees through internal gear transmission and outputs it from the right-angle conversion output port. The right-angle converter is connected to the mechanical tachometer through the transmission flexible shaft, and the length of the transmission flexible shaft can be changed, so the transmission torque can be transmitted to the mechanical tachometer which can be installed at any position through the transmission flexible shaft. Because the running speed of the fuel pump is the same as that of the engine, the engine speed obtained in this way is very accurate and can be displayed intuitively on the mechanical tachometer. The utility model has the advantages of simple structure, convenient installation, no need for live working and very safe use.
Patent drawings
Brief description of drawings
[0009] Figure 1 is the structural schematic diagram of the utility model.
[00 10] fig. 2 is the structural diagram of the power take-off joint in fig. 1. [00 1 1] Figure 3 is a top view of Figure 2.
[00 12] fig. 4 is an enlarged view of A-A in fig. 2.
[00 13] fig. 5 is the structural diagram of the power take-off end cover in fig. 1
[00 14] fig. 6 is a left view of fig. 5.
[00 15] fig. 7 is a structural diagram of the right-angle converter in fig. 1.
Fig. 8 is a right side view of fig. 7.
expand on
[00 17] As shown in figures 1, 2, 3, 4, 5, 6, 7 and 8, the utility model mainly comprises a power take-off joint 5, a power take-off end cover 6, a right-angle converter 1 1 and a transmission flexible shaft1. The nut on the power take-off joint 5 is a hexagonal groove with a circular appearance and an inner cavity matching the size of the fuel pump driving gear fixing nut 4. When in use, the power take-off connector 5 is connected to the fixed nut 4 of the fuel pump driving gear through the nut and can rotate together with the diesel pump. The shaft with key at the other end of the power output joint 5 is made of integral stainless steel by lathe Ij and EDM. The shaft end is connected to the input port 8 of the right-angle converter 1 1 through the key on it, the output port 10 of the right-angle converter 18 is connected to one end of the transmission flexible shaft 12, and the other end of the transmission flexible shaft 12 is connected to the mechanical tachometer/kloc-. On the outer circumference of the power output connector 5, there is a power output end cover 6, which fixes the right-angle converter 1 1. The power output end cover 6 is disc-shaped and can be made of plastic. There are two threaded holes on the step of one end of the disc-shaped power output end cover 6, and the pressure plate 9 on the right-angle converter 1 1 is connected with the power output end cover 6 through bolts passing through the threaded holes on the step of the power output end cover 6. A shaft with external thread extends from the other end of the power output end cover 6, and the threaded shaft extends to match the threaded opening of the front gear chamber wall 7 of the engine. When in use, the end cover 6 of the power take-off is fixed on the front gear chamber wall 7 of the engine through the external thread protruding from the shaft, which plays the role of fixing the power take-off joint 5; The right-angle converter 1 1 is a 90-degree reversing device, the input port 8 and the output port 10 are gear driven, and aluminum casting is completed. The input port 8 of the right-angle converter 1 1 is designed with a bayonet shaft with an internal keyway matched with the shaft extension of the power output connector 5. The output port 10 has an external thread for fixing the transmission flexible shaft 12 and an internal bayonet shaft with a coaxial core with the transmission flexible shaft 12.
[00 18] working principle: as shown in fig. 1, the power take-off joint 5 of this utility model is connected with the fixed nut 4 of the fuel pump driving gear through the nut on it, and the power take-off end cover 6 is connected with the threaded port of the front gear chamber wall 7 of the engine through its external thread, and the fixed nut 4 of the fuel pump driving gear in the front gear chamber of the engine is used as the connecting power output point, and the nut transmits the force transmitted by torque through the power take-off joint 5. Output to the torque input port 8 of the right-angle converter 1 1, which changes the transmission torque transmitted by the power take-off joint 5 by 90 degrees through internal gear transmission and outputs it from the output port 10 of the right-angle converter. The output port 65438 of the right-angle converter directly screws one end of the transmission flexible shaft 12 in the transmission flexible shaft 12 to the right-angle converter 10 through the output port10 of the right-angle converter. The other end is directly connected to the mechanical tachometer 13. The length of the transmission flexible shaft 12 can be changed by design, so the transmission torque can be transmitted to the mechanical tachometer 13 which can be installed at any position through the transmission flexible shaft 12. Because the fuel pump I is driven by the fuel pump driving gear 2 on the fuel pump shaft 3 during operation, the engine speed obtained in this way is very accurate and intuitive.
claim of right
1. A diesel engine mechanical tachometer device is characterized in that the power take-off joint (5) is a shaft with a nut at one end and a key at the other end, and the shaft of the power take-off joint (5) is terminated in the input port (8) of a right-angle converter (1 1), and the right-angle converter (65438)
2. The diesel engine mechanical tachometer device according to claim 1 is characterized in that a disc-shaped power take-off end cover (6) for fixing the right-angle converter (1 1) is arranged on the outer circumference of the power take-off joint (5), and one end of the power take-off end cover (6) is connected with the power take-off end cover through a threaded hole on its step.
3. The diesel engine mechanical tachometer device according to claim 1 is characterized in that the nut on the power take-off adapter (5) is a hexagonal countersunk groove, and its inner cavity is matched with the size of the fuel pump driving gear fixing nut (4).
4. The diesel engine mechanical tachometer device according to claim 1, characterized in that the right-angle converter (1 1) is a steering device with an input port (8) and an output port (10) at 90 degrees.