The double countershaft transmission plays a huge role in the heavy-duty vehicle market due to its good transmission performance and large carrying capacity. Due to its structural requirements, the gears on the intermediate shaft need to be machined to the teeth, and the degree of the pair is directly affected, which directly affects the assembly quality of the transmission, thereby affecting the performance of the entire transmission. According to the company's new product processing needs, this paper designs a simple tooth-toothing device, which can stabilize the internal and external tooth symmetry, and has a simple structure and convenient operation, which is widely praised by users.
Process flow
Figure 1 Intermediate shaft second gear
The second gear of the transmission intermediate shaft of a certain type of our company adopts the internal spline cogging and the outer ring gear tooth symmetry structure, and the symmetry requirement is within 0.06mm (see Figure 1). To meet product design requirements, we use the following process:
(1) The inner spline has a small hole diameter due to the inner spline. For example, the shape of the pinion cutter is small, and the number of teeth of the pinion cutter is small, and the spline quality of the workpiece after machining is poor. The knife has a low life and low processing efficiency. Therefore, we use the broaching process of broach with high processing efficiency and high processing precision.
(2) The outer ring gear is used to ensure the machining accuracy of the outer ring gear. The process of shaving the teeth after the teeth is selected, so that it is necessary to design a set of gear-to-tooth clamps for inserting the outer ring gear.
2. Analysis of the tooth problem
According to the product design requirements, after the workpiece is processed, it must be ensured that one tooth groove of the inner spline is symmetrical with one tooth groove of the outer ring gear. We select a tooth groove of the inner spline to position, and then make a certain cutting edge of the pinion cutter just cut off. The outer ring gear metal (see Figure 2) opposite the internal spline positioning groove can achieve the symmetry requirement of the workpiece after machining.
Figure 2 shows the gear shaping
3. Solve the problem of teeth
In order to meet the requirements of the gear-toothing of the product, we designed the tooth clamp as shown in Figure 3. The structure is a spline groove positioning method in the workpiece. The ball is fixed on the slider and the slider is spring. drive. When using, push the handle by hand, load the workpiece, loosen the handle, and slightly rotate the workpiece by hand, so that the ball is fixed in the internal spline tooth groove, so that the circumferential direction of the workpiece is well positioned, and then the sleeve is tightened to realize the workpiece setting. Heart and tension.
Figure 3 pinion to tooth fixture
In the first round of trial production, a total of 50 workpieces were put into production. After the machine tool and the toothed fixture were debugged, 45 workpieces were continuously processed, all of which were measured for symmetry, and the symmetry was stable within 0.06 mm. Meet the on-site production needs.
4. Conclusion
Through field practice, after the outer ring gear is machined by the machining process scheme and the gear shaping jig, the symmetry can be stably controlled within 0.06, which fully satisfies the mass production of the workpiece.
Zhejiang Sealand Technology Co., Ltd. is a trustworthy manufacturer of LPG Mass Flow Meter, LPG Mass Flowmeter, LPG Flow Meter, LPG Flowmeter, LPG meter, ATEX, IECEx & CE approved.
Sealand have DN03 to DN150 size meters and are developing bigger models. Each meter can be connected with your computer through a USB-to-RS485 converter. The detail steps are as follows. Connect the meter and computer with a USB-to-RS485 converter( converter A+ end to transmitter A+ end, B- to B-, and GND to GDN); turn to device manager of the computer to check COM port connected with meter. Start the software, select the right COM port and click Connect; do not change any other parameters (if you do not know the right one, click Automatic options on the left, click Connect, plug & unplug the transmitter, and then check if it is connected). You can click Connect on the tool bar to disconnect or connect again. It will shown Connected/Not Connected at the bottom of this interface.
LPG Mass Flow Meter, LPG Mass Flowmeter, LPG Flow Meter, LPG Flowmeter, LPG meter
Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeters.com