Integrated positioning pin hole structure

[0021] Embodiment 1, by adding an appropriate limit boss in the middle of the two pin holes, and optimizing the size combination, it can not only ensure the coaxiality of the two pin holes, but also limit the axial movement of the two positioning pins in an acceptable range. within range. Accurate positioning of parts is realized, which prevents the installation size of related parts from being out of tolerance due to inaccurate assembly positions of the parts themselves, which affects the quality of the whole machine. The positioning failure caused by the axial movement of the positioning pin during use is avoided, and the reliability of positioning is improved. It also avoids assembly difficulties caused by misalignment of parts or incorrect positioning pin installation operations, which affects production beats. The cylinder block 1, the gear chamber 2 and the gear chamber cover 3 are connected and fastened by connecting bolts 4, and are positioned and connected by using t...

[0022] Embodiment 2, a combined positioning pin hole structure of the present invention, including cylinder block 1, gear chamber 2, gear chamber cover 3, connecting bolts 4 (multiple), small positioning pins 5 (two), large positioning pins 6 ( two). The gear chamber 2 is installed on the cylinder block 1, the gear chamber cover 3 is installed on the gear chamber 2, and is fixed by connecting bolts 4, the gear chamber 2 is accurately positioned on the cylinder block 1 by the large positioning pin 6, and the gear chamber cover 3 is positioned by the small positioning pin The pin 5 is positioned precisely on the gear chamber 2 . The positioning pin hole on the gear chamber 2 adopts the structure of the present invention, the two pin holes are coaxial, and the center is designed with a spacer boss. A limited boss is designed in the middle of the two coaxial positioning pin holes. The boss height (relatively small pin hole) h, h is preferably (0.5~1). a=L-(a+b), b, c, and H ...