CN207894327U - Measure the detection instrument of bent axle Woodruff key slots and keyways axial position size - Google Patents

Abstract

The utility model discloses a detection tool for measuring the axial position and size of a semicircular keyway of a crankshaft, which comprises a gauge block and a gauge. Design, when the gauge block is inserted into the keyway, the arc of the gauge block contacts with both sides of the inner arc of the keyway to achieve V-shaped positioning, ensuring that the vertical centerline of the gauge block coincides with the centerline of the inner arc of the keyway; the gauge has a through end and a stop For the cylinder at the end, the diameters of the through end and the stop end are determined by the semicircular keyway, the measurement reference plane and the outer diameter of the gauge block. The gauge block and the gauge can be used together to determine whether the size from the center of the semicircle keyway to the reference plane of the tested part conforms to drawing requirements. Adopting the technical solution of the utility model, the measurement cost is low, the measurement precision is high, the operation method is simple and the detection efficiency is high in the process of measuring the axial position dimension of the semicircular keyway of the crankshaft.

Description

Inspection tool for measuring the axial position and dimension of crankshaft semicircular keyway

technical field

The utility model relates to the field of crankshaft processing, in particular to a detection tool for measuring the axial position and size of a semicircular keyway of a crankshaft, which includes a gauge block and a plug gauge.

Background technique

It is usually necessary to process a semicircular keyway at the installation journal of the pulley at the front end of the crankshaft. The processing requirements for the semicircular keyway on the part drawing generally have requirements such as the width, depth, symmetry, and axial position of the keyway.

At present, there are related detection methods for the detection of the width, depth, and symmetry of the semicircular keyway, but there is no convenient detection method for the axial position and dimension detection of the semicircular keyway. The most commonly used measurement methods are: (1) The three-coordinate detection method is used. (2) Use the platform and height gauge detection method: put the crankshaft on the platform, use the height gauge to find out the upper and lower positions of the semicircular keyway opening and the intersection line with the outer circle of the journal to the position of the reference plane, and then use the notch Add half of the slot width to the lower dimension or subtract half of the slot opening width from the upper dimension of the slot to get the position dimension from the centerline of the semicircular keyway to the datum plane.

The above two detection methods are time-consuming and labor-intensive and have large measurement errors: (1) Three-coordinate detection is troublesome to operate. The bottom surface of the semicircular keyway is in the shape of an arc, and the space is narrow. It is time-consuming and inconvenient for the probe to find a point on the inner arc. (2) The measurement method of the platform and the height gauge has a large error. Draw a line at the upper and lower positions of the slot opening and compare to determine the position and size of the intersection line between the arc of the slot and the outer circle of the journal, and the measurement error is relatively large.

Utility model content

Aiming at the deficiencies of the prior art, the technical problem solved by the utility model is how to solve the problem of quickly and accurately measuring the axial position and size of the semicircular keyway of the crankshaft.

In order to solve the above technical problems, the technical solution adopted by the utility model is a detection tool for measuring the axial position of the semicircular keyway of the crankshaft, including a gauge block and a gauge. The gauge block has a flat circular shape, and its thickness is designed according to the width of the keyway , its circular diameter is designed for the inner arc diameter of the key slot. When the gauge block is inserted into the key slot, the arc of the gauge block contacts with both sides of the inner arc of the key slot to realize V-shaped positioning, ensuring that the center line of the vertical direction of the gauge block is in line with the inner arc of the key slot. The centerline coincides; the gauge is a cylinder with a through end and a stop end, and the diameter of the through end and the stop end is determined by the semicircular keyway, the measurement datum surface and the outer diameter of the gauge block, and the gauge block and the gauge can be obtained by cooperating with each other. It can be judged whether the dimension from the center of the semicircular keyway of the tested part to the datum plane meets the drawing requirements.

As a further improvement of the utility model, the diameters of the through end and the stop end are respectively the minimum and maximum values of the dimensional tolerance from the semicircular keyway to the measurement reference plane and the dimensional tolerance of the outer diameter of the gauge block.

As a further improvement of the utility model, the circular diameter of the gauge block is 0.1 mm larger than the maximum diameter of the arc in the keyway;

As a further improvement of the utility model, in order to realize the gap-free fit between the gauge block and the keyway, the thickness of the gauge block is designed into multiple groups of size specifications, each group is graded by 0.005mm, preferably 5 to 7 groups, and the measurement is selected according to the actual width of the keyway Gauge block corresponding to thickness.

Use the above-mentioned detection tool for measuring the axial position and dimension of the crankshaft half-circle keyway for detection, including the following steps:

(1) According to the width of the semicircular keyway, select a set of auxiliary gauge blocks corresponding to the thickness, so that there is no looseness when the gauge block is inserted into the keyway without backlash;

(2) Use a gauge to detect the distance from the outer arc of the gauge block to the reference plane, and determine whether the measured size is qualified:

1) If the through end of the gauge can pass but the stop end cannot, it is judged that the measured size is qualified;

2) If the through end of the gauge does not pass, it is determined that the size of the measured position is too small and unqualified;

3) If the stop end of the gauge can pass, it is judged that the size of the measured position is too large and unqualified.

Adopting the technical solution of the utility model, the measurement cost is low, the measurement precision is high, the operation method is simple and the detection efficiency is high in the process of measuring the axial position dimension of the semicircular keyway of the crankshaft.

Description of drawings

Figure 1 is a technical drawing of the axial position dimension of the semicircular keyway;

Fig. 2 is a structural schematic diagram of the utility model when in use.

Detailed ways

The specific implementation of the utility model will be further described below in conjunction with the accompanying drawings and examples, but the utility model is not limited.

Figure 1 shows the technological drawing of the axial position and dimension of the semicircular keyway, which is expressed by the front partial sectional view and the left view. D is the diameter of the circle where the shaft of the semicircular keyway is located, and L is the axial distance from the centerline of the arc of the shaft of the semicircular keyway to the reference plane.

Fig. 2 shows the schematic structure of the utility model when it is used. A detection tool for measuring the axial position of the semicircular keyway of the crankshaft includes a gauge block 1 and a gauge 2. The gauge block 1 is a flat circular shape, and its thickness varies according to the width of the keyway. Design, the diameter of the circular arc inside the key slot is designed with a circular diameter. When the gauge block 1 is inserted into the key slot, the arc of the gauge block 1 is in contact with both sides of the arc in the key slot to achieve V-shaped positioning, ensuring that the vertical centerline of the gauge block 1 is in line with the key slot. The center line of the arc in the keyway coincides; the gauge 2 is a cylinder with a through end and a stop end, and the diameter of the through end and the stop end is determined by the semicircular keyway, the measurement reference plane and the outer diameter of the gauge block 1, and the gauge block 1 , Gauge 2 can determine whether the size from the center of the semicircular keyway of the tested part 3 to the reference plane meets the requirements of the drawing through the use of each other.

As a further improvement of the present invention, the diameters of the through end and the stop end of the gauge 2 are respectively the minimum and maximum values of the dimensional tolerance from the semicircular keyway to the measurement reference plane and the dimensional tolerance of the outer diameter of the gauge block 1 .

As a further improvement of the utility model, the circular diameter of the gauge block 1 is 0.1 mm larger than the maximum diameter of the arc in the keyway;

As a further improvement of the utility model, in order to realize the gapless fit between the gauge block 1 and the keyway, the thickness of the gauge block 1 is designed into multiple groups of size specifications, each group is graded by 0.005mm, preferably 5 to 7 groups, and the measurement is based on the actual keyway Select the gauge block 1 corresponding to the thickness for the width.

Use the above-mentioned detection tool for measuring the axial position and dimension of the crankshaft half-circle keyway for detection, including the following steps:

(1) According to the width of the semicircular keyway, select a set of auxiliary gauge blocks corresponding to the thickness, so that there is no looseness when the gauge block is inserted into the keyway without backlash;

(2) Use a gauge to detect the distance from the outer arc of the gauge block to the reference plane, and determine whether the measured size is qualified:

1) If the through end of the gauge can pass but the stop end cannot, it is judged that the measured size is qualified;

2) If the through end of the gauge does not pass, it is determined that the size of the measured position is too small and unqualified;

3) If the stop end of the gauge can pass, it is judged that the size of the measured position is too large and unqualified.

Adopting the technical solution of the utility model, the measurement cost is low, the measurement precision is high, the operation method is simple and the detection efficiency is high in the process of measuring the axial position dimension of the semicircular keyway of the crankshaft.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, replacements and modifications to these embodiments still fall within the protection scope of the present invention.

Claims (5)

1. A detection tool for measuring the axial position size of the crankshaft semicircular keyway, comprising a gauge block (1), the gauge block (1) is a flat circular shape, its thickness is designed according to the keyway width, and its circular diameter is inside the keyway. The arc diameter is designed, and the arc contacts with the two sides of the arc in the keyway to realize V-shaped positioning. It is characterized in that: it also includes a gauge (2). The diameter of the end and the stop end is determined by the semicircular keyway, the measurement reference surface and the outer diameter of the gauge block (1), and the gauge block (1) and the gauge (2) can be used together to determine the measured piece (3) Whether the dimension from the center of the semicircular keyway to the datum plane meets the drawing requirements. 2. The detection tool for measuring the axial position dimension of the crankshaft semicircular keyway according to claim 1, characterized in that: the diameters of the through end and the stop end of the gauge (2) are respectively the dimensional tolerance from the semicircular keyway to the measurement reference plane and The minimum and maximum tolerances for the outer diameter of the gauge block (1). 3. The inspection tool for measuring the axial position and dimension of the crankshaft semicircular keyway according to claim 1 or 2, characterized in that: the circular diameter of the gauge block (1) is 0.1 mm larger than the maximum diameter of the inner arc of the keyway. 4. The detection tool for measuring the axial position of the semicircular keyway of the crankshaft according to claim 1 or 2, characterized in that: the thickness of the gauge block (1) is designed to be no less than 2 sets of size specifications, each set is 0.005mm Grading. 5. The detection tool for measuring the axial position and dimension of the semicircular keyway of the crankshaft according to claim 4, characterized in that: the number of sets of said gauge blocks (1) is 5 to 7 sets.