CN104019099A - Integrated positioning pin hole structure - Google Patents

Abstract

The invention discloses an integrated positioning pin hole structure. The integrated positioning pin hole structure comprises a cylinder body, a gear chamber, a gear chamber cover, connecting bolts, small positioning pins, large positioning pins, a boss, a large positioning pin hole, a small positioning pin hole, a part clamping width and a boss height. The integrated positioning pin hole structure is characterized in that the gear chamber and the gear chamber cover are fastened to the cylinder body through the connecting bolts; the large positioning pin installation hole and the small positioning pin installation hole are located on the same axial line, so that the problems that every two positioning pins are installed in an unrelated mode, coaxial parts can not be accurately positioned, bolt holes are misaligned, the parts can not be installed, the positioning pins move axially and fail to function, and assembly uncertainty causes reworking waste and affects product are solved. The coaxiality of the two positioning pin holes is guaranteed, installation accuracy of the parts is also guaranteed, axial displacement of the positioning pins is effectively limited within a certain range, and the integrated positioning pin hole structure is simple in structure, easy to machine, practical and reliable.

Description

A combination positioning pin hole structure

technical field

The invention relates to a positioning structure, in particular to a combined positioning pin hole structure. the

Background technique

As shown in Figure 1, for a class of parts A, B, and C that are stacked with multiple parts and require precise relative positions, B itself needs to be installed on part A, and part C is installed on part B. Part B and part C are fixed on part A. In order to ensure the accurate installation position of the parts and avoid the failure of the bolt to be installed due to the serious misalignment of the parts, part B needs to be accurately positioned with part A through positioning pins, and part C also needs to be positioned through positioning pins and parts. Accurate positioning of part B, the existing method is shown in Figure 2 and Figure 3. Figure 2 shows that the two positioning pin holes are independent and not related to each other. Since common bolts are required to connect, this structure cannot guarantee coaxiality , the parts cannot be positioned accurately. In severe cases, the bolt holes will also be misplaced, making it difficult to install parts. As shown in Figure 3, the two pin holes are connected, and a coaxial stepped hole is made to ensure that the two pin holes are coaxial, but the axial movement range of the positioning pin is relatively large. During the use of the machine, the positioning pin may deviate due to vibration. The correct installation position will lose the positioning function and reduce the reliability of the machine. And using this kind of structure, when assembling the positioning pin, may need to rework due to improper operation, waste man-hours, and affect the production cycle. the

Contents of the invention

The invention provides a new structure of combined locating pin holes. A limiting boss is added in the middle of the two coaxial locating pin holes, and the combination of each size is optimized, which solves the defects of the existing technical solutions well. The coaxiality is guaranteed, and the positioning Accurate, reliability guaranteed. the

The technical solution of the present invention is such that a combined positioning pin hole structure includes a cylinder block, a gear chamber, a gear chamber cover, connecting bolts, a small positioning pin, a large positioning pin, a boss, a large positioning pin hole, a small pin Hole, part clamping width, boss height, characterized in that there is a gear chamber 2 on the top of the cylinder block 1, and a gear chamber cover 3 on the top of the gear chamber 2, and the connection between the cylinder block 1 and the gear chamber 2 and the gear chamber cover 3 The bolt 4 is connected and fastened, and is connected by positioning with the large positioning pin 6 and the small positioning pin 5. There is a boss a in the middle of the gear chamber 2, and the boss a is a stepped hole. Pin hole b, large positioning pin hole B is installed with large positioning pin 6, between gear chamber 2 and gear chamber cover 3 is small positioning pin hole C, small positioning pin 5 is installed in small positioning pin hole C, large positioning pin hole b , Boss a, center line of small positioning pin hole C are coaxial, and the axis lines of large positioning pin 6, boss a, and small positioning pin 5 are coaxial during installation. The gear chamber 2 where the connecting bolt 4 is installed is a through hole, the gear chamber cover 3 is a through hole, the cylinder block 1 is a counterbore, the cylinder block 1 where the large positioning pin 6 is installed is a counterbore, the gear chamber 2 is a through hole, and the gear chamber cover 3 is a through hole, the large positioning pin 6 is 3-30mm in diameter, 5-60mm in length, the small positioning pin 5 is 1-30mm in diameter, 3-50mm in length, and the thickness of the gear chamber (in millimeters) L=10-90, h =0.1～5, b=1～50, c =0～50, a=L-(A+b)=1～60. the

There are more than one connecting bolt 4. the

Small alignment pin 5 has more than one. the

Large alignment pin 6 has more than one. the

The height h of the boss is equal to the value of the outer diameter of the small positioning pin minus the outer diameter of the boss a.                                                                                                                                                                                                                                                               

Compared with prior art, the beneficial effect of the present invention is:

1. Ensure the coaxiality of the two positioning pin holes, ensure the installation accuracy of the parts, and avoid the assembly difficulties caused by the misalignment of the parts and affect the production cycle.

2. Effectively limit the axial displacement of the positioning pin within a certain range, avoid the serious consequences of machine failure caused by the loss of positioning function of the positioning pin, and improve the reliability of the machine. the

3. Practical and reliable, it can be used in various occasions. the

4. The structure is simple, the processing is simple, and the process is easy to realize. the

Description of drawings

Figure 1 is a three-dimensional schematic diagram of the overall structure assembly of a combined positioning pin hole structure of the present invention. the

2 and 3 are schematic diagrams of the prior art. the

Fig. 4 is a structural installation and use state view of a combined positioning pin hole structure of the present invention with large and small positioning pin holes and a boss in the middle. the

Fig. 5 is a schematic cross-sectional view of the overall structure assembly of a combined positioning pin hole structure of the present invention. the

Fig. 6 is a backup diagram of a combined positioning pin hole structure of the present invention. the

Reference signs: cylinder block 1, gear chamber 2, gear chamber cover 3, connecting bolt 4, small positioning pin 5, large positioning pin 6, boss a, large positioning pin hole b, small positioning pin hole C, parts clamping Width L, boss height h. the

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. the

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 the large positioning pin 6 and the small positioning pin 5. There is a boss a in the middle of the gear chamber 2, and the boss a It is a step hole, between the gear chamber 2 and the cylinder block 1 is the large positioning pin hole b, the large positioning pin hole B is installed with the large positioning pin 6, and between the gear chamber 2 and the gear chamber cover 3 is the small positioning pin hole C, The small positioning pin 5 is installed to the small positioning pin hole C, the center line of the large positioning pin hole b, the boss a, and the small positioning pin hole C are coaxial, and the axes of the large positioning pin 6, the boss a, and the small positioning pin 5 are installed. on the coaxial line. The gear chamber 2 where the connecting bolt 4 is installed is a through hole, the gear chamber cover 3 is a through hole, the cylinder block 1 is a counterbore, the cylinder block 1 where the large positioning pin 6 is installed is a counterbore, the gear chamber 2 is a through hole, and the gear chamber cover 3 is a through hole, the large positioning pin 6 is 3-30mm in diameter, 5-60mm in length, the small positioning pin 5 is 1-30mm in diameter, 3-50mm in length, and the thickness of the gear chamber (in millimeters) L=10-90, h =0.1～5, b=1～50, c =0～50, a=L-(A+b)=1～60. The height h of the boss is equal to the value of the outer diameter of the small positioning pin minus the outer diameter of the boss a. the

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 are determined according to specific implementation cases, and combinations of various sizes all fall within the protection scope of the present invention. The large positioning pin 6 is a cylindrical pin 12X26 (that is, diameter 12, length 26), the small positioning pin 5 is a cylindrical pin 10X25 (that is, diameter 10, length 25), the gear chamber is thick, L=41, preferably: h=0.5, b= 14, c=12, then a= L-(a+b)=13. Through this group of optimal dimensions, the axial movement of the large positioning pin 6 and the small positioning pin 5 is limited within a small range, which avoids the loss of positioning effect caused by excessive axial movement of the positioning pins, improves positioning reliability, and can also be used during assembly. There is no error, and this structure is also easy to realize in technology, and the processing is simple. the

Claims (5)

1. A combined locating pin hole structure, including cylinder block, gear chamber, gear chamber cover, connecting bolts, small locating pin, large locating pin, boss, large locating pin hole, small locating pin hole, part clamping width, The height of the boss is characterized in that there is a gear chamber (2) on the cylinder block (1), and a gear chamber cover (3) above the gear chamber, and the cylinder block, the gear chamber and the gear chamber cover are connected by connecting bolts (4) Tighten it, and use the large positioning pin (6) and the small positioning pin (5) to position and connect. There is a boss a in the middle of the gear chamber, and the boss a is a stepped hole. The hole between the gear chamber and the cylinder block is a large positioning pin hole b, the large positioning pin hole b is installed with the large positioning pin, the small positioning pin hole C is between the gear chamber and the gear chamber cover, the small positioning pin is installed in the small positioning pin hole C, the large positioning pin hole b, boss a, small The center line of the positioning pin hole C is coaxial, and the axis line of the large positioning pin, boss a, and small positioning pin is on the same axis during installation. The gear chamber where the connecting bolt is installed is a through hole, the gear chamber cover is a through hole, and the cylinder block The cylinder block where the large positioning pin is installed is a counterbore, the gear chamber is a through hole, the gear chamber cover is a through hole, the large positioning pin is 3-30mm in diameter, and the length is 5-60mm, and the small positioning pin is 1-30mm in diameter , length 3~50mm, gear chamber thickness (in millimeters) L=10~90, h=0.1~5, b=1~50, c=0~50, a=L-(A+b)=1~ 60. 2. A combined positioning pin hole structure according to claim 1, characterized in that there are more than one connecting bolts. 3. A combined positioning pin hole structure according to claim 1, characterized in that there are more than one small positioning pins. 4. A combined positioning pin hole structure according to claim 1, characterized in that there are more than one large positioning pins. 5. A combined positioning pin hole structure according to claim 1, characterized in that the height h of the boss is equal to the value of the outer diameter of the small positioning pin minus the outer diameter of the boss a.