Abstract: at present, the domestic pin mainly adopts hydraulic pressing machine to complete, the status of pressing process pressing force can not monitor the development, we design a digital form to monitor the pin pressing force of planetary gear deceleration starter pin pressing special equipment. The equipment can pin the pressing force of the real-time monitoring, timely detection of substandard products, to improve the mechanical manufacturing industry, especially plays an important role in automobile electric appliance industry production efficiency and product quality.71212

Key words: pin pressing equipment; press force; sensor; PLC

Now the automobile factory production of light car such as Shanghai Volkswagen Santana, C5 car, A4 car, Jetta 5V and 2V, DPCA is used as coaxial planetary gear reduction starter. Mainly because it has the following 3 advantages: (1) the reduction mechanism and the motor are in the same axis line structure compact, beautiful shape, small volume; (2) in parallel meshing gear without lateral torque transmission; (3) the motor running smoothly, small vibration, low noise. In the planetary gear reducer to initiate a connection between [1] machine and the output shaft is in the star wheel through a pin. To connect the pin shaft pressing at present mainly adopts hydraulic machine to complete the fit, it is pressed into the process of pressing force can not be monitored. If the amount of interference pin shaft and pin hole is too large to increase the time of pressing the pressing force, can press the pressing force is unable to pin indentation; the amount of interference is too small, the pin may deviate from the planetary wheel and the output shaft, causing a series of traffic safety hazard.

Based on the above background, on the basis of extensive research, the existing pin shaft press were analyzed, compared, combined with the domestic market demand, developed a digital form by monitoring the planetary gear pin is pressed into the process of pin pressing special equipment. It can counter axial force in the process of pressing pressure real-time monitoring, timely detection of substandard products, to improve the mechanical manufacturing industry especially plays an important role in automotive electrical industry production efficiency and product quality.

1 planetary gear deceleration starter pin shaft press structure and characteristics

1.1 The overall structure of the planetary gear deceleration starter pin  shaft press

The design of the planetary gear reduction starter pin shaft press for a while the 3 planetary gear pin shafts respectively pass through the planetary wheel is pressed into the output shaft of the pin hole, as shown in Figure 1.

Fig. 1 Schematic diagram of planetary wheel, output shaft and pin shaft assembly

According to the amount of interference between the pin and the pin hole of the pin shaft, determine the maximum indentation stress range should be between 4.708 to 8.199 k N. The pin pressing domestic hydraulic machine is mainly used to complete, are generally used to control the positioning pin hole and the positioning pin size to strictly control the general situation suitable for small batch production of the product, and the pin is pressed into the state of the pin in the [2] indentation process press force can not be monitored. Further analysis: first of all manufacturers productivity higher, about 10 s will be a group of pin is pressed into the planetary wheel and the output shaft pin pin Kong Zhong. For the production Mass production parts, even the 100% check, there will be missed detection and false detection, but the actual production is the use of sampling approach to control; fully qualified on the output shaft and pin sizes, if the hardness of the components is not well controlled, the pressing force of the positioning pin will appear unqualified so. To solve the problem is: in the pin is pressed into the output pin hole at the same time to achieve control of the pin pressing force. If the pressing force of any pin 3 pin in the specified range, equipment must be given to the appropriate signal. The standard product removed. According to this idea, the paper designs a new kind of Planetary gear deceleration starter pin pressing equipment, its structure is shown in Figure 2.