CN205279944U - A special measuring for measuring part size is poor - Google Patents

Abstract

The utility model discloses a special measuring tool for measuring the size difference of parts, which comprises an external gauge body provided with a through hole, a dial indicator is fixed on the top of the through hole of the external gauge body, and an internal The gauge body is provided with a guide rod on the inner gauge body, and the guide rod of the inner gauge body is placed in the through hole of the outer gauge body to move axially, and the top end of the guide rod of the inner gauge body keeps in contact with the dial indicator probe. This device can accurately measure the height difference between the inner and outer rings of the taper bearing and the height difference between the spline shaft shoulder of the working chamber assembly and the bearing mounting surface of the front end cover through the external gauge body and the internal gauge body, and then calculate the corresponding thickness of the adjustment pad through the theoretical formula , to finally ensure the adjustment clearance of the tapered bearing, and obtain the final measurement value by using the method of multi-point measurement and taking the average value of the dial gauge, which can meet the high precision requirements of the tapered bearing clearance specified in the drawing.

Description

Special measuring tools for measuring the dimensional difference of parts

【Technical field】

The utility model belongs to the field of measuring tools, in particular to a special measuring tool for measuring the size difference of parts.

【Background technique】

The FHB320 parallel retarder is a safety device newly developed and designed by our company that relies on hydraulic transmission to realize driving auxiliary braking. The core component of the braking function, the stator and rotor assembly, adopts a double-tapered bearing support structure at both ends. Because the tapered bearing is very sensitive to the bearing clearance, too large or too small clearance will lead to early failure of the transmission system. Generally, adjustment pads are needed for adjustment. Therefore, formulating a reasonable pad selection plan and designing a stable and reliable measuring tool are the keys to ensuring product quality.

The taper bearing clearance requires high precision, and precise pad selection has always been a technical problem in the field of assembly. At the same time, due to the unique internal structure of the FHB320 parallel retarder, it is even more difficult.

Existing gages have the following problems:

1. The structure of the working chamber assembly of the parallel retarder is complex, and it is difficult to select pads for the paired cone bearings to ensure the clearance of the cone bearings;

2. The clearance accuracy requirements of the tapered bearing specified in the design drawings are high (0.10-0.15mm), and it is difficult for ordinary measurement methods to meet this accuracy;

3. Due to the high precision requirements for pad selection, the measuring tool must have high measurement stability;

4. When measuring the height difference between the inner and outer rings of the tapered bearing, the tapered bearing may distort the measurement results due to its own slight movement;

5. The shaft shoulder of the spline shaft of the working chamber assembly and the bearing mounting surface of the front end cover are two narrow planes of different parts, and the depth of the front end cover is very deep, which is inconvenient to measure.

【Content of utility model】

The purpose of this utility model is to overcome the above disadvantages, to provide a special measuring tool for measuring the size difference of parts, which can ensure the adjustment clearance of the tapered bearing.

In order to achieve the above object, the utility model includes an external gauge body with a through hole, a dial gauge is fixed on the top of the through hole of the external gauge body, an internal gauge body is provided at the bottom of the through hole of the external gauge body, and an internal gauge body is arranged on the internal gauge body. The guide rod, the guide rod of the inner gauge body is placed in the through hole of the outer gauge body to move axially, and the top end of the guide rod of the inner gauge body keeps in contact with the dial indicator probe.

The dial gauge is fixedly connected with the external gauge through the gauge frame.

The meter frame is connected with the external body by thread.

A spring is arranged between the guide rods of the outer gauge body and the inner gauge body.

One end of the spring presses the watch frame, and the other end presses the guide rod of the internal gauge body.

The guide rod of the inner gauge body is provided with a positioning groove, and a threaded hole is opened at a position corresponding to the guide groove on the outer gauge body, and a bolt is arranged in the threaded hole.

Compared with the prior art, the utility model can accurately measure the height difference between the inner and outer rings of the cone bearing and the height difference between the spline shaft shoulder of the working cavity assembly and the bearing installation surface of the front end cover through the external gauge body and the internal gauge body, and then through the theoretical The formula calculates the adjustment pad corresponding to the thickness, and finally ensures the adjustment clearance of the tapered bearing. The final measurement value is obtained by using the method of multi-point measurement and averaging of the dial gauge, which can meet the high precision requirements of the tapered bearing clearance specified in the drawing.

Furthermore, the guide rod of the inner gauge body of the present invention is provided with a positioning groove, and the position corresponding to the guide groove on the outer gauge body is provided with threaded holes, which can prevent the inner gauge body from falling off through bolts.

【Description of drawings】

Fig. 1 is the structural representation that the utility model adopts T-shaped internal regulation body;

Fig. 2 is the structure schematic diagram that the utility model adopts internal contact rod;

Fig. 3 is a schematic diagram of the structure of the calibration tool.

【detailed description】

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1, Fig. 2 and Fig. 3, the utility model comprises the external regulation body 1 that is provided with through hole, and the top of the through hole of external regulation body 1 is fixed with dial gauge 2, and the bottom of the through hole of external regulation body 1 is provided with internal The gauge body 6, the inner gauge body 6 is provided with a guide rod, the guide rod of the inner gauge body 6 is placed in the through hole of the outer gauge body 1 and can move axially, and the top end of the guide rod of the inner gauge body 6 is kept in contact with the dial gauge probe. contact, the dial indicator 2 is fixedly connected with the external gauge body 1 through the gauge frame 3, the gauge frame 3 and the external gauge body 1 are connected through threads, and the guide rod of the internal gauge body 6 is provided with a positioning groove, which is connected with the external gauge body 1 A threaded hole is provided at a position corresponding to the guide groove, and a bolt 5 is arranged in the threaded hole.

Preferably, a spring 4 is arranged between the guide rod of the outer gauge body 1 and the inner gauge body 6 , one end of the spring 4 presses the watch frame 3 , and the other end presses the guide rod of the inner gauge body 6 .

When in use, step 1 is to measure the height difference between the inner and outer rings of the tapered bearing: first, position the tapered bearing on the bearing positioning platform 9, and then use a measuring tool with a T-shaped internal gauge body 6 to measure the height of the inner and outer rings of the tapered bearing. difference h ₁ ;

Step 2, measuring the height difference between the spline shaft shoulder and the bearing installation surface of the front end cover: firstly use the zero adjustment positioning hole 8 on the calibration tool to zero the measuring tool, then measure through the rod-shaped internal gauge body 6, and finally get The height difference h ₂ between the spline shaft shoulder and the bearing installation surface of the front end cover;

Step 3, deduced according to the pad selection theory, can get B=h ₁ +h ₂ +b=h ₁ +h ₂ +0.125; the thickness of the pad to be adjusted can be calculated by using the formula for each measurement of h ₁ and h ₂ values, Finally, the purpose of adjusting the gap of the tapered bearing is achieved, where B is the thickness of the gasket, and b is the axial gap of 0.10-0.15mm; (according to the design intention, the ideal state of b is the median value, so it can be set to 0.125mm).

Through drawing analysis and field tests, the project team formulated a reasonable gasket selection plan, and designed and developed a set of special measuring tools for gasket selection. The method of the height difference of the bearing mounting surface of the front end cover, the adjustment pad of the corresponding thickness is calculated through the theoretical formula, and finally the adjustment clearance of the tapered bearing is guaranteed, which is the key to the successful trial production of the retarder product.

Claims (6)

1. special measuring tool one kind poor for measuring accessory size, it is characterized in that: include being provided with the outside regulator (1) of through hole, the via top of outside regulator (1) is fixed with amesdial (2), the via bottoms of outside regulator (1) is provided with internal regulator (6), internal regulator (6) is provided with guide post, the guide post of internal regulator (6) is placed in the through hole of outside regulator (1) and can move axially, and internal regulator (6) guide post top is kept in touch with amesdial gauge head.

2. a kind of special measuring tool for measuring accessory size difference according to claim 1, it is characterised in that: described amesdial (2) is connected by dial framework (3) is fixing with outside regulator (1).

3. a kind of special measuring tool for measuring accessory size difference according to claim 2, it is characterised in that: it is threaded connection between described dial framework (3) and outside regulator (1).

4. a kind of special measuring tool for measuring accessory size difference according to claim 1, it is characterised in that: it is provided with spring (4) between the guide post of described outside regulator (1) and internal regulator (6).

5. a kind of special measuring tool for measuring accessory size difference according to claim 4, it is characterised in that: one end of described spring (4) compresses dial framework (3), and the other end compresses the guide post of internal regulator (6).

6. a kind of special measuring tool for measuring accessory size difference according to claim 1, it is characterized in that: described internal regulator (6) guide post is provided with locating slot, offer screwed hole in the upper position corresponding with gathering sill of outside regulator (1), in screwed hole, be provided with bolt (5).