A kind of outer diameter roundness detection tool for inner gear ring with connecting ear

Abstract

This utility model discloses a fixture for detecting the roundness of the outer diameter of an internal gear ring with connecting ears. The fixture includes a main body with at least two reference portions having reference surfaces on their inner sides. These reference portions are arranged in a ring-shaped interval and form a receiving chamber. A first clearance groove is formed between adjacent reference portions, communicating with the receiving chamber. This first clearance groove, by engaging with the connecting ears on the internal gear ring, confines the internal gear ring within the receiving chamber, ensuring that the outer diameter surface of the internal gear ring is in contact with the reference surfaces of the reference portions. This utility model eliminates the need for additional measuring tools, avoiding mechanical interference between the connecting ears and measuring tools. Furthermore, it eliminates the need for clearance during the detection process, ensuring continuous detection, reducing human error, improving detection accuracy, and effectively increasing detection efficiency. This allows production personnel to quickly determine the roundness of the outer diameter of the internal gear ring.

Description

Technical Field

[0001] This utility model relates to a fixture for the roundness of the outer diameter of an internal gear ring, and in particular to a fixture for detecting the roundness of the outer diameter of an internal gear ring with connecting lugs. Background Technology

[0002] In the field of mechanical transmission, the internal gear ring is a core transmission component, and its geometric accuracy directly affects the stability of the transmission system. The traditional internal gear ring structure usually consists of a circular ring body and inner meshing teeth. In quality inspection, the outer diameter roundness detection is a key process. The current detection method uses a fixture to fix the internal gear ring, and then uses the probe of a roundness indicator (such as a dial indicator) to contact the outer diameter surface. While keeping the measuring instrument stationary, the workpiece is rotated one revolution, and the roundness is determined based on the change in the reading: the fluctuation amplitude and frequency of the reading directly reflect the degree of roundness deviation.

[0003] However, this method has significant technical limitations:

[0004] For special internal gear ring structures with radial connecting ears, the connecting ears will mechanically interfere with the roundness gauge during rotation, forcing the inspection process to be interrupted and requiring reverse rotation to avoid it, which seriously disrupts the continuity of inspection. The repeated forward and reverse operations caused by the interference not only extend the inspection time of a single piece by more than 40%, but may also introduce secondary measurement deviations due to human operation errors. Utility Model Content

[0005] The purpose of this invention is to provide a fixture for detecting the roundness of the outer diameter of an internal gear ring with connecting lugs. This eliminates the need for additional measuring tools, ensuring continuous detection and reducing human error. It not only improves detection accuracy but also effectively increases detection efficiency.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A fixture for detecting the roundness of the outer diameter of an internal gear ring with connecting ears includes a fixture body. The fixture body has at least two reference portions with reference surfaces on their inner sides. The reference portions are arranged in a ring at intervals and form a receiving chamber. A first clearance groove is formed between two adjacent reference portions to communicate with the receiving chamber. The first clearance groove is used to confine the internal gear ring in the receiving chamber by cooperating with the connecting ears on the internal gear ring, so that the outer diameter surface of the internal gear ring is in contact with the reference surface of the reference portion.

[0008] Based on the above technical solution, the present invention can be improved as follows:

[0009] Furthermore, the reference part has a smooth arc-shaped surface on its inner side corresponding to the outer diameter surface of the internal gear ring, and the arc-shaped surface serves as the reference surface.

[0010] Furthermore, the height of the reference portion is greater than the thickness of the internal gear ring.

[0011] Furthermore, the width of the first clearance groove is greater than the width of the connecting lug on the internal gear ring.

[0012] Furthermore, the fixture body has a second clearance groove on one of the reference portions, the second clearance groove being used to engage with the flange on the internal gear ring.

[0013] Furthermore, the top surface of the fixture body is provided with an arc-shaped boss at the first clearance groove. The top surface of the arc-shaped boss fits against the bottom surface of the connecting ear of the internal gear ring that fits in the first clearance groove. The top surface of the fixture body fits against the bottom surface of the flange of the internal gear ring that fits in the second clearance groove, so that the internal gear ring can be laid flat on the fixture body.

[0014] Furthermore, the reference part is an arc-shaped block integrally formed on the top surface of the fixture body. The arc-shaped blocks are arranged at equal intervals around the center of the fixture body, and the first clearance groove is formed between the side end faces of two adjacent arc-shaped blocks; the inner surface of the arc-shaped block is the reference surface.

[0015] Furthermore, the arc-shaped block forms a rounded bevel at the junction of its side end face and the reference surface.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention provides at least two reference portions with reference surfaces on their inner sides on the main body of the fixture. These reference portions form a receiving chamber, and a first clearance groove is formed between two adjacent reference portions. The first clearance groove can engage with the connecting ear on the internal gear ring, confining the internal gear ring within the receiving chamber. This ensures that the outer diameter surface of the internal gear ring is in contact with the reference surface of the reference portion, thereby enabling the outer diameter roundness detection of the internal gear ring with the connecting ear. This eliminates the need for additional measuring tools, avoids mechanical interference between the connecting ear and the measuring tool, and eliminates the need for clearance during the detection process, ensuring continuous detection, reducing human error, improving detection accuracy and efficiency, and facilitating quick judgment by production personnel on the outer diameter roundness of the internal gear ring. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a top view of the internal toothed ring with connecting ears in the embodiment;

[0020] Figure 2 This is a side cross-sectional view of the internal toothed ring with connecting ears in the embodiment;

[0021] Figure 3This is a top view of the fixture for detecting the outer diameter roundness of an internal gear ring with connecting lugs, as described in the embodiment.

[0022] Figure 4 This is a side cross-sectional view of the fixture for detecting the roundness of the outer diameter of an internal gear ring with connecting lugs, as described in the embodiment.

[0023] The markings on the attached diagram are: 1-Jig body, 2-Internal gear ring, 3-Connecting ear, 4-Arc block, 5-First clearance groove, 6-Circular arc bevel, 7-Flange, 8-Second clearance groove, 9-Arc boss. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These descriptions are intended to aid in understanding the utility model but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] See Figures 1 to 4 This embodiment relates to a fixture for detecting the roundness of the outer diameter of an internal gear ring with connecting ears. It includes a fixture body 1, on which at least two reference portions are arranged in a ring-shaped interval. The inner side of the reference portion has a reference surface, and a first clearance groove 5 is formed between two adjacent reference portions. The first clearance groove 5 is used to cooperate with the connecting ears 3 on the internal gear ring 2 so that the internal gear ring 2 is limited to the fixture body 1, and the outer diameter surface of the internal gear ring 2 is in contact with the reference surface of the reference portion.

[0026] Specifically, the fixture body 1 has a circular ring structure, but a circular or rectangular structure can be used instead, depending on actual needs. The fixture body 1 has a top surface, a bottom surface, an outer peripheral wall, and an inner peripheral wall, wherein the top surface and the bottom surface of the fixture body 1 are both flat surfaces. During inspection, the connecting ear 3 on the internal gear ring 2 cooperates with the first clearance groove 5 to limit the internal gear ring 2 to be located on the fixture body 1. The bottom end of the internal gear ring 2 is in contact with the top surface of the fixture body 1, and the outer diameter surface of the internal gear ring 2 is in contact with the reference surface on the inner side of the reference part. At this time, by swinging the connecting ear 3 on the internal gear ring 2, the internal gear ring 2 is driven to rotate on the top surface of the fixture body 1 relative to the reference part around the axis. The smoothness of the rotation of the internal gear ring 2 allows production personnel to quickly judge whether the outer diameter roundness of the internal gear ring 2 is qualified.

[0027] In this embodiment, the internal gear ring 2, whose outer diameter roundness is to be measured, is provided with three connecting ears 3. Therefore, the following description of this embodiment will be based on the provision of three reference parts on the fixture body 1.

[0028] All three reference parts are arc-shaped blocks 4, which are integrally formed on the top surface of the fixture body 1 and are arranged at equal intervals around the center of the fixture body 1. The three arc-shaped blocks 4 form a receiving cavity with a top opening on the top surface of the fixture body 1. The internal gear ring 2 is rotatably received in the receiving cavity. When the internal gear ring 2 is received in the receiving cavity, the outer diameter surface of the internal gear ring 2 is in contact with the inner surface of the arc-shaped block 4. At this time, the inner surface of the arc-shaped block 4 is the reference surface, which is a smooth arc-shaped surface.

[0029] It should be noted that the height of the arc-shaped block 4 is greater than the thickness of the internal gear ring 2 to prevent the internal gear ring 2 from detaching from the accommodating chamber during testing. At the same time, the arc-shaped block 4 is used as the reference part. Depending on the actual needs, a block of the shape in the prior art can also be used instead. As long as the block has a smooth arc-shaped surface on the inside that corresponds to the outer diameter surface of the internal gear ring 2, the above-mentioned outer diameter roundness test can also be achieved.

[0030] A first clearance groove 5 is formed between the side end faces of two adjacent arc-shaped blocks 4 to connect the accommodating chamber. The width of the first clearance groove 5 is greater than the width of the connecting ear 3 on the inner gear ring 2, so that when the outer diameter roundness of the inner gear ring 2 is detected, the connecting ear 3 on the inner gear ring 2 can be swung at the clearance groove to drive the inner gear ring 2 to rotate to complete the detection.

[0031] The arc-shaped block 4 forms a rounded corner 6 at the junction of the side end face and the reference surface. The arc of the rounded corner 6 corresponds to the arc of the corner between the outer diameter surface and the connecting ear 3 of the internal gear ring 2, so that the connecting ear 3 on the internal gear ring 2 can fit into the first clearance groove 5 to avoid interference and wear, and at the same time improve the flexibility when swinging the connecting ear 3.

[0032] Since the inner gear ring 2, whose outer diameter roundness is to be measured, is also provided with a flange 7 in this embodiment, and the flange 7 is located between two connecting ears 3, the fixture body 1 in this embodiment is provided with a second clearance groove 8 on one of the arc blocks 4. The second clearance groove 8 is used to cooperate with the flange 7 on the inner gear ring 2.

[0033] In this embodiment, the thickness of the connecting ear 3 on the internal gear ring 2 is half the thickness of the internal gear ring 2, and the thickness of the flange 7 on the internal gear ring 2 is the same as the thickness of the internal gear ring 2. Correspondingly, an arc-shaped boss 9 is provided on the top surface of the fixture body 1 at the first clearance groove 5. The top surface of the arc-shaped boss 9 is in contact with the bottom surface of the connecting ear 3 of the internal gear ring 2 that fits in the first clearance groove 5, and the top surface of the fixture body 1 is in contact with the bottom surface of the flange 7 of the internal gear ring 2 that fits in the second clearance groove 8. This allows the internal gear ring 2 to be laid flat on the fixture body 1, with the bottom surface of the internal gear ring 2 and the top surface of the fixture body 1 in contact. This ensures that the rotation axis of the internal gear ring 2 is perpendicular to the top surface of the fixture body 1, preventing the internal gear ring 2 from deflecting to one side on the fixture body 1, thereby improving the detection accuracy.

[0034] During testing, the connecting ear 3 on the internal gear ring 2 is engaged with the first clearance groove 5, and the flange 7 and the second clearance groove 8 on the internal gear ring 2 are engaged, so that the internal gear ring 2 is confined in the accommodating cavity surrounded by the arc block 4; by swinging the connecting ear 3 on the internal gear ring 2, the internal gear ring 2 is driven to rotate relative to the arc block 4 around the axis on the top surface of the fixture body 1; when the internal gear ring 2 rotates smoothly, that is, the outer diameter roundness of the internal gear ring 2 is high; when the internal gear ring 2 rotates with a jam, that is, the outer diameter roundness of the internal gear ring 2 is low.

[0035] The outer diameter roundness testing fixture in this embodiment can perform outer diameter roundness testing on internal gear rings with connecting lugs without the need for additional measuring tools. This avoids mechanical interference between the connecting lugs and measuring tools, and eliminates the need for avoidance during the testing process, ensuring testing continuity, reducing human error, improving testing accuracy, and effectively increasing testing efficiency.

[0036] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug, comprising a fixture body, characterized in that, The fixture body is provided with at least two reference parts with reference surfaces on their inner sides. The reference parts are arranged in a ring and spaced apart to form a receiving chamber. A first clearance groove is formed between two adjacent reference parts to communicate with the receiving chamber. The first clearance groove is used to limit the internal gear ring in the receiving chamber by cooperating with the connecting ear on the internal gear ring, so that the outer diameter surface of the internal gear ring is in contact with the reference surface of the reference part.

2. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 1, characterized in that, The reference part has a smooth arc-shaped surface on its inner side corresponding to the outer diameter surface of the internal gear ring, and the arc-shaped surface serves as the reference surface.

3. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 2, characterized in that, The height of the reference section is greater than the thickness of the internal gear ring.

4. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 3, characterized in that, The width of the first clearance groove is greater than the width of the connecting lug on the internal gear ring.

5. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 4, characterized in that, The fixture body has a second clearance groove on one of the reference portions, the second clearance groove being used to engage with the flange on the internal gear ring.

6. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 5, characterized in that, The top surface of the fixture body is provided with an arc-shaped boss at the first clearance groove. The top surface of the arc-shaped boss fits into the bottom surface of the connecting ear of the internal gear ring that fits into the first clearance groove. The top surface of the fixture body fits into the bottom surface of the flange of the internal gear ring that fits into the second clearance groove, so that the internal gear ring can be laid flat on the fixture body.

7. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 6, characterized in that, The reference part is an arc-shaped block integrally formed on the top surface of the fixture body. The arc-shaped blocks are arranged at equal intervals around the center of the fixture body, and the first clearance groove is formed between the side end faces of two adjacent arc-shaped blocks; the inner surface of the arc-shaped block is the reference surface.

8. The fixture for detecting the roundness of the outer diameter of an internal gear ring with a connecting lug according to claim 7, characterized in that, The arc-shaped block forms a rounded bevel at the junction of its side end face and the reference surface.

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