A special gauge for detecting position and size of circular arc keyway

Abstract

The utility model discloses a special gauge for arc key groove position size detection, including semicircle sample piece, the upper end outside of semicircle sample piece is provided with the limit flange, the upper end surface of semicircle sample piece right side is opened to the axially two ends open right triangle test groove, and the right triangle test groove includes vertical test groove plane and test groove inclined plane, and the upper end of right triangle test groove is the open slot, and the semicircle center axis of semicircle sample piece is located in same plane with vertical test groove plane, the left side upper end surface of semicircle sample piece is perpendicular with vertical test groove plane. The special gauge for arc key groove position size detection that the utility model provides can directly determine the center of the measured arc key groove, eliminates indirect measurement error, and has the characteristics of low cost and high efficiency simultaneously.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical precision measurement, and relates to arc keyways, specifically to a special measuring tool for detecting the position and size of arc keyways. Background Technology

[0002] The semi-circular key is a core component in shaft transmission systems, used to transmit torque between the shaft and its components. Its assembly accuracy directly affects transmission reliability. Traditional methods require indirect measurement and calculation, and traditional measuring tools cannot directly locate the center of the arc keyway. The error of the indirect measurement method (±0.25mm) exceeds the tolerance requirement (±0.2mm) of the arc keyway, resulting in significant errors. Furthermore, traditional methods are inefficient for on-site measurement, with single-piece measurements taking more than 15 minutes, failing to meet the needs of mass production. Using precision instruments such as coordinate measuring machines (CMMs) for measurement is costly and unsuitable for rapid on-site inspection in the workshop. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model proposes a special measuring tool for detecting the position and dimensions of arc keyways, thereby solving the technical problems of large measurement errors and low efficiency caused by the difficulty in locating the center of the arc keyway in existing technologies.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A special measuring tool for detecting the position and dimension of a circular keyway includes a semi-circular sample block. A limiting flange is provided on the outer side of the upper end of the semi-circular sample block. A right-angled triangular measuring groove with open ends is formed on the upper right side of the semi-circular sample block. The right-angled triangular measuring groove includes a vertical measuring groove plane and a measuring groove inclined plane. The upper end of the right-angled triangular measuring groove is an open groove opening. The central axis of the semi-circular sample block is located in the same plane as the vertical measuring groove plane. The upper left side of the semi-circular sample block is perpendicular to the vertical measuring groove plane.

[0005] This utility model also has the following technical features: The semicircular sample block is also provided with an axially penetrating circular overtravel groove, the central axis of which is arranged along the axial direction. The circular overtravel groove is located at the intersection of the vertical measuring groove plane and the inclined surface of the right-angled triangular measuring groove, and the groove opening of the circular overtravel groove is connected to the right-angled triangular measuring groove.

[0006] The tolerance between the diameter of the semicircular sample block and the diameter of the measured circular keyway is h6.

[0007] The distance between the lower end face of the limiting flange and the lower end face of the semi-circular sample block is equal to the depth of the measured arc keyway.

[0008] The height of the semicircular sample block is equal to the radius of the keyway being measured.

[0009] The height of the vertical measuring groove plane is half the height of the semicircular sample block.

[0010] The radius of the circular overrun groove is 2mm.

[0011] The semi-circular sample block and the limiting flange are made of GCr15 bearing steel. Compared with the prior art, the present invention has the following beneficial technical effects: (I) The special measuring tool for detecting the position and size of the arc keyway proposed in this utility model can directly determine the center of the arc keyway being measured, eliminate indirect measurement errors, and has the characteristics of low cost and high efficiency.

[0012] (II) The special measuring tool for measuring the position and size of the arc keyway proposed in this utility model is designed with a special semi-circular sample block, which can be accurately matched with the arc keyway to locate the center of the circle, realize the direct measurement of the end face distance, and ensure that the measurement accuracy can reach IT7 level (±0.015mm). Attached Figure Description

[0013] Figure 1 This is a structural diagram of a special measuring tool.

[0014] Figure 2 This is a schematic diagram of the measurement structure for the keyway under test.

[0015] The meanings of the labels in the figure are as follows: 1-semicircular sample block, 2-limiting flange, 3-right-angled triangular measuring groove, 4-circular overtravel groove, 5-measured arc keyway, 6-measured part, 7-vernier scale, 8-measuring claw.

[0016] 301 - Vertical measuring groove plane, 302 - Measuring groove inclined plane.

[0017] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, all mechanical equipment and components in this utility model are based on existing mechanical equipment and components.

[0019] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0020] Example: This embodiment provides a dedicated measuring tool for detecting the positional dimensions of a circular arc keyway, such as... Figure 1As shown, it includes a semicircular sample block 1. A limiting flange 2 is provided on the outer side of the upper end of the semicircular sample block 1. A right-angled triangular measuring groove 3 with open ends is provided on the upper right side of the semicircular sample block 1. The right-angled triangular measuring groove 3 includes a vertical measuring groove plane 301 and a measuring groove inclined surface 302. The upper end of the right-angled triangular measuring groove 3 is an open groove. The central axis of the semicircle of the semicircular sample block 1 is located in the same plane as the vertical measuring groove plane 301. The upper left side of the semicircular sample block 1 is perpendicular to the vertical measuring groove plane 301.

[0021] In this embodiment, the preferred embodiment is as follows: Figure 1 As shown, a circular overtravel groove 4 with an axial through-hole is also provided in the semi-circular sample block 1. The central axis of the circular overtravel groove 4 is arranged along the axial direction. The circular overtravel groove 4 is located at the intersection of the vertical measuring groove plane 301 and the measuring groove inclined plane 302 of the right-angled triangular measuring groove 3. The groove opening of the circular overtravel groove 4 is connected to the right-angled triangular measuring groove 3.

[0022] In this embodiment, the preferred tolerance between the diameter of the semicircular sample block 1 and the diameter of the measured arc keyway 5 is h6.

[0023] In this embodiment, preferably, the distance between the lower end face of the limiting flange 2 and the lower end face of the semi-circular sample block 1 is equal to the depth of the measured arc keyway 5.

[0024] In this embodiment, preferably, the height of the semi-circular sample block 1 is equal to the radius of the measured arc keyway 5.

[0025] In this embodiment, the height of the vertical measuring groove plane 301 is preferably half the height of the semicircular sample block 1.

[0026] In this embodiment, the radius of the circular overrun groove 4 is preferably 2mm.

[0027] In this embodiment, the semicircular sample block 1 and the limiting flange 2 are preferably made of GCr15 bearing steel. In this embodiment, the limiting flange 2 preferably provides axial constraint (fitting clearance ≤ 0.01mm).

[0028] In this embodiment, the circular overtravel groove 4 and the right-angled triangular measuring groove 3 are preferably used to provide measurement avoidance space.

[0029] In this preferred embodiment, the upper left side surface of the semicircular sample block 1 is the A measurement surface, and the vertical measuring groove plane 301 is the B measurement surface. The A measurement surface and the B measurement surface are perpendicular to each other. This ensures that the direction of the measuring force is perpendicular to the contact surface, eliminating cosine error.

[0030] In this embodiment, the preferred embodiment is as follows: Figure 2 As shown, the measurement method for a special measuring tool used to inspect the position and dimension of a circular arc keyway includes the following steps: Step 1: Support the part to be tested 6 stably on the V-block, with the keyway 5 to be tested facing upwards; Step 2: Place the semi-circular sample block 1 into the keyway 5 of the arc to be measured, and set one end of the limiting flange 2 to face the end face of the part to be measured 6, so that the end face of the part to be measured 6 is parallel to the measurement surface A. Step 3: Use the vernier caliper 7 to insert one end of the measuring claw 8 into the right-angled triangular measuring groove 3 and the circular overrun groove 4, and extend the other end of the measuring claw 8 toward the end face of the part being measured 6. Step 4: Make the measuring jaw 8 close to the measuring surface B, the vernier caliper 7 close to or parallel to the measuring surface A, and the side end face of the vernier caliper 7 close to the inner end face of the part 6 being measured. Take the reading, and the reading value is the dimension required in the drawing. Step 5: Repeat the measurement three times and record the average of the three measurements.

[0031] In this embodiment, the test sample was measured using traditional methods, precision measurement methods, and a special measuring tool for detecting the position and size of the arc keyway proposed in this invention. The measurement results are shown in Table 1.

[0032] Table 1 Measurement Results

[0033] In this embodiment, as shown in Table 1, the special measuring tool for detecting the position and size of the arc keyway can solve the problem of rapid, high-precision and low-cost measurement of the distance between the center of the arc keyway 5 being measured and the inner end face of the part 6 being measured.

[0034] In this embodiment, the semicircular sample 1 is stored in a special box soaked in anti-rust oil. The reference surface of the semicircular sample 1 is calibrated monthly using a grade 0 marble platform. When the wear of the measuring surfaces (measuring surfaces A and B) of the semicircular sample 1 is greater than 0.03 mm, the corresponding specification of the semicircular sample 1 needs to be replaced.

Claims

1. A special measuring tool for detecting the position and dimension of a circular arc keyway, characterized in that, The device includes a semicircular sample block (1), with a limiting flange (2) on the outer side of the upper end of the semicircular sample block (1). A right-angled triangular measuring groove (3) with open ends on both the upper right side of the semicircular sample block (1) is provided. The right-angled triangular measuring groove (3) includes a vertical measuring groove plane (301) and a measuring groove inclined plane (302). The upper end of the right-angled triangular measuring groove (3) is an open groove. The central axis of the semicircle of the semicircular sample block (1) is in the same plane as the vertical measuring groove plane (301). The upper left side of the semicircular sample block (1) is perpendicular to the vertical measuring groove plane (301).

2. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 1, characterized in that, The semicircular sample block (1) is also provided with an axially penetrating circular overtravel groove (4), the central axis of which is arranged along the axial direction; the circular overtravel groove (4) is located at the intersection of the vertical measuring groove plane (301) and the measuring groove inclined plane (302) of the right-angled triangular measuring groove (3), and the groove opening of the circular overtravel groove (4) is connected to the right-angled triangular measuring groove (3).

3. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 1, characterized in that, The tolerance between the diameter of the semicircular sample block (1) and the diameter of the measured circular keyway (5) is h6.

4. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 1, characterized in that, The distance between the lower end face of the limiting flange (2) and the lower end face of the semicircular sample block (1) is equal to the depth of the measured arc keyway (5).

5. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 1, characterized in that, The height of the semicircular sample block (1) is equal to the radius of the measured circular keyway (5).

6. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 1, characterized in that, The height of the vertical measuring groove plane (301) is half the height of the semicircular sample block (1).

7. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 2, characterized in that, The radius of the circular overrun groove (4) is 2mm.

8. The special measuring tool for detecting the position and dimension of a circular arc keyway as described in claim 1, characterized in that, The semicircular sample block (1) and the limiting flange (2) are made of GCr15 bearing steel.

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