Combined jig integrating hole detection and key groove detection

Abstract

The utility model relates to the technical field of workpiece detection, in particular to a combined jig integrating hole detection and key groove detection, which comprises a sleeve for detecting a key groove on a crankshaft and a detection rod for detecting a threaded hole, a through inner hole is arranged on the sleeve along the axial direction of the sleeve, one end of the detection rod extends into the inner hole and is in sliding connection with the sleeve, and the other end of the detection rod is in sliding connection with the threaded hole. A flat key is further arranged on the hole wall of the inner hole, and the flat key is arranged in the axis direction of the inner hole. According to the utility model, the aperture, depth, concentricity and skew of the threaded hole on the crankshaft and the width, depth, parallelism and concentricity of the key slot can be detected at the same time, and compared with the traditional method that different detection devices are adopted for respective detection, the detection process is convenient and rapid, the detection time and the detection cost are saved, and the detection efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece detection, in particular to a combined fixture integrating hole detection and keyway detection. Background Art

[0002] As one of the core components of the engine, the engine crankshaft mainly converts the force transmitted by the piston and connecting rod into torque, and outputs it through the rotation of the crankshaft to drive the transmission system and other auxiliary devices of the car. The structure of the crankshaft is complex, such as Figure 1-2 As shown, it includes multiple journals, keyways 101, threaded holes 102 and other key features; for example, in several general-purpose engines produced by our company, such as GX160, GX200, GP160, GP200 and other models, the crankshaft PT02 threaded hole 102 is used to install or fix other components, and its thread integrity, dimensional tolerance and concentricity directly affect the stability and reliability of assembly; the keyway 101 is a key structure for installing the drive, and its concentricity and dimensional accuracy must be strictly controlled to ensure the smoothness of transmission and the effective transmission of power. Therefore, after the production is completed, it is an indispensable part to ensure the quality of the generator to detect the size and concentricity of the threaded holes and keyways on the crankshaft; however, the traditional detection method often requires the use of different tools or equipment to detect the threaded holes and keyways respectively, which makes the detection process time-consuming and labor-intensive, and the detection efficiency is low. Utility Model Content

[0003] The utility model provides a combined fixture integrating hole detection and keyway detection, which can solve the technical problem that the existing concentricity detection of the threaded hole and the keyway on the crankshaft is time-consuming, labor-intensive and low in detection efficiency.

[0004] This application provides the following technical solutions:

[0005] A combined fixture integrating hole detection and keyway detection comprises a sleeve for detecting the keyway on a crankshaft and a detection rod for detecting the threaded hole. A through inner hole is arranged on the sleeve along its axial direction. One end of the detection rod extends to the inner hole and is slidably connected to the sleeve. A flat key is also arranged on the hole wall of the inner hole and is arranged along the axial direction of the inner hole.

[0006] Inspection process: During inspection, the sleeve is sleeved on the end to be inspected of the crankshaft, wherein the inner hole of the sleeve is sleeved on the crankshaft, the flat key set on the inner hole wall is inserted into the keyway of the crankshaft, and one end of the inspection rod is inserted into the threaded hole from the end of the crankshaft, and then the sleeve and the inspection rod are continued to be pushed to make the flat key slide in the keyway and the inspection rod move into the threaded hole; since the inner hole of the sleeve matches the outer diameter of the crankshaft, and the inspection rod and the flat key are both standard inspection parts, when interference occurs when pushing the sleeve or the inspection rod, it indicates that the concentricity and size of the threaded hole or keyway on the crankshaft are deviated, thereby screening out unqualified crankshaft workpieces and completing rapid inspection of the workpieces.

[0007] Beneficial effects:

[0008] 1. By setting a detection rod and a sleeve, and setting a flat key in the sleeve, and combining the two together during detection, it is possible to simultaneously detect the threaded hole, keyway concentricity, and size on the crankshaft. Specifically, the aperture, depth, concentricity, and skew of the threaded hole can be detected, and the width, depth, parallelism, and concentricity of the keyway can be detected. Compared with the traditional method of using different detection equipment for separate detection, the detection process of this application is convenient and fast, which saves detection time and detection cost, and greatly improves detection efficiency.

[0009] 2. The detection rod is slidably set on the sleeve, which can limit the detection rod, improve the accuracy of the detection rod inserted into the threaded hole at the end of the crankshaft, and further ensure the accuracy and efficiency of the detection.

[0010] 3. A through inner hole is set on the sleeve. When in use, the inner hole is set on the crankshaft, which can also play a guiding and limiting role.

[0011] Furthermore, the inner hole includes two sections of mutually connected limiting holes and mounting holes, the aperture of the limiting hole is larger than the aperture of the mounting hole, and the axes of the limiting hole and the mounting hole overlap with the center line of the sleeve, the detection rod passes through the mounting hole and extends into the limiting hole, the detection rod is slidably connected to the hole wall of the mounting hole, and a flat key is arranged on the hole wall of the limiting hole.

[0012] Beneficial effect: By setting the inner hole into two sections, one section is used to install the detection rod, and the other section is used to be sleeved on the crankshaft, and the aperture of the limiting hole is larger than the aperture of the installation hole, a step can be formed inside the sleeve, which can be used for positioning. During detection, the sleeve is pushed to slide on the crankshaft. When the step rests against the end of the crankshaft, it means that it is pushed into place. At this time, the sleeve is removed to complete the detection.

[0013] Furthermore, a mounting groove is provided on the hole wall of the limiting hole, one side of the flat key is fixed in the mounting groove by a fastener, and the other side protrudes from the mounting groove in the limiting hole for matching with the keyway on the crankshaft.

[0014] Beneficial effect: An installation groove is set on the limit hole to facilitate the installation of the flat key and ensure the position of the flat key. During inspection, the protruding part of the flat key is inserted into the keyway of the crankshaft. When the sleeve is pushed to move, the flat key moves in the keyway of the crankshaft; if the concentricity and size of the keyway deviate, the flat key cannot slide normally in the keyway, thereby screening out unqualified products.

[0015] Furthermore, an exhaust hole is provided on the wall of the sleeve, and the exhaust hole is communicated with the inner hole.

[0016] Beneficial effect: The exhaust hole is provided to exhaust the air inside the sleeve, so as to reduce the resistance when the sleeve is pushed to move.

[0017] Further, the exhaust hole and the flat key are in the same radial direction of the sleeve.

[0018] Beneficial effect: During inspection, the crankshaft is placed flat on the inspection station with the keyway located directly above the crankshaft. By arranging the exhaust hole and the flat key on the same side, it can serve as an indicator for the inspectors, allowing them to quickly identify the position of the flat key in the inner hole of the sleeve, so that the sleeve can be quickly put on the crankshaft and the flat key can be inserted into the keyway of the crankshaft.

[0019] Furthermore, the roughness of the inner hole wall is less than 0.4.

[0020] Beneficial effect: ensure the smoothness of the inner hole wall.

[0021] Furthermore, a tip is provided at one end of the detection rod located outside the inner hole. When the portion of the detection rod located at the inner hole is fully inserted into the threaded hole of the crankshaft, the end of the tip abuts against the end of the sleeve.

[0022] Beneficial effects: The end head is provided to facilitate holding the detection rod. In addition, when the end head abuts against the end of the sleeve, it indicates that the detection rod is inserted to the bottom of the threaded hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the crankshaft to be tested;

[0024] Figure 2 for Figure 1 The right side view of the crankshaft to be inspected;

[0025] Figure 3 This is a schematic diagram of the structure of the combined fixture of the utility model;

[0026] Figure 4 for Figure 3 Left view of the middle combined fixture;

[0027] Figure 5 It is a cross-sectional view of the combined fixture;

[0028] Figure 6Schematic diagram of the combined fixture for testing crankshafts. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The marks in the drawings of the specification include: sleeve 1, inner hole 11, limiting hole 111, mounting hole 112, exhaust hole 12, detection rod 2, end 21, flat key 3, fastener 31, crankshaft 100, keyway 101, threaded hole 102.

[0031] Example

[0032] A combination fixture that integrates hole detection and keyway detection, such as Figure 3 As shown, it includes a sleeve 1 for detecting a keyway 101 on a crankshaft 100 and a detection rod 2 for detecting a threaded hole 102. A through inner hole 11 is arranged on the sleeve 1 along its axial direction. One end of the detection rod 2 extends to the inner hole 11 and is slidably connected to the sleeve 1. A flat key 3 is also arranged on the hole wall of the inner hole 11. The flat key 3 is arranged along the axial direction of the inner hole 11. It should be noted that the size of the detection rod 2 is a standard size, which matches the threaded hole 102 to be detected. The flat key 3 is also a standard size, which matches the keyway 101 to be detected. The specific size is adjusted according to the workpiece to be detected.

[0033] like Figure 4-5 As shown, in this embodiment, the inner hole 11 includes two sections of mutually connected limiting holes 111 and mounting holes 112, the axes of the limiting holes 111 and the mounting holes 112 overlap with the center line of the sleeve 1, the aperture of the limiting hole 111 is larger than the aperture of the mounting hole 112, and a limiting step is formed at the connection between the limiting hole 111 and the mounting hole 112; specifically, the aperture of the limiting hole 111 matches the outer diameter of the crankshaft 100, and the limiting hole 111 is sleeved on the crankshaft 100 when in use. When the end of the crankshaft 100 abuts against the limiting step, it indicates that the sleeve 1 is pushed into place; the detection rod 2 passes through the mounting hole 112 and extends into the limiting hole 111, the detection rod 2 is slidably connected to the hole wall of the mounting hole 112, the aperture of the mounting hole 112 matches the outer diameter of the detection rod 2, and when the detection rod 2 can be inserted into the threaded hole 102 and slide in the threaded hole 102, it indicates that the size and concentricity of the threaded hole 102 on the crankshaft 100 are qualified.

[0034] Specifically, the flat key 3 is arranged on the hole wall of the limiting hole 111; in this embodiment, a mounting groove is opened on the hole wall of the limiting hole 111, one side of the flat key 3 is fixed in the mounting groove by a fastener 31, and the other side protrudes from the mounting groove located in the limiting hole 111, which is used to cooperate with the keyway 101 on the crankshaft 100. Specifically, the fastener 31 is a screw, which penetrates from the outer wall of the sleeve 1 to fix the flat key 3 on the mounting groove.

[0035] like Figure 3 As shown, an exhaust hole 12 is also provided on the wall of the sleeve 1. In the present embodiment, two exhaust holes 12 are preferably provided, and the exhaust holes 12 are connected to the limiting hole 111. The exhaust holes 12 are used to exhaust the air inside the sleeve 1 to reduce the resistance when the sleeve 1 is pushed to move; specifically, the exhaust holes 12 and the flat key 3 are in the same radial direction of the sleeve 1, and the keyway 101 is located directly above the crankshaft 100 during inspection. By arranging the exhaust holes 12 and the flat key 3 on the same side, it can serve as an indication for the inspector, so that the inspector can quickly identify the position of the flat key 3 in the inner hole 11 of the sleeve 1, thereby quickly sleeve the sleeve 1 on the crankshaft 100 and insert the flat key 3 into the keyway 101 of the crankshaft 100.

[0036] In order to ensure the smoothness of the wall of the inner hole 11, the wall roughness of the inner hole 11 in this embodiment is less than 0.4; in order to facilitate holding the detection rod 2, an end cap 21 is provided at the end of the detection rod 2 located outside the inner hole 11, and when the detection rod 2 is located at the position of the inner hole 11 and is fully inserted into the threaded hole 102 of the crankshaft 100, the end of the end cap 21 abuts against the end of the sleeve 1, which is used to indicate that the detection rod 2 is inserted to the bottom of the threaded hole 102.

[0037] The detection process of the combined fixture is as follows:

[0038] like Figure 6 As shown, when in use, the sleeve 1 is sleeved on the end to be detected of the crankshaft 100, wherein the limiting hole 111 of the sleeve 1 is sleeved on the crankshaft 100, and the flat key 3 set on the limiting hole 111 is inserted into the keyway 101 of the crankshaft 100; then the sleeve 1 and the detection rod 2 are pushed to make the flat key 3 slide in the keyway 101, and the detection rod 2 moves into the threaded hole 102; when the end of the crankshaft 100 abuts against the limiting step inside the sleeve 1, and the end 21 of the end of the detection rod 2 abuts against the end of the sleeve 1, it means that it is pushed into place.

[0039] If interference occurs when pushing the sleeve 1 or the detection rod 2, it indicates that there is a deviation in the concentricity or size of the threaded hole 102 or the keyway 101 on the crankshaft 100, thereby screening out unqualified crankshaft 100 workpieces; if the pushing process is smooth, it means that the workpiece to be inspected is qualified; after the inspection is completed, the sleeve 1 and the detection rod 2 are pulled out together to complete the rapid inspection of the workpiece. Since the threaded hole 102 and the keyway 101 can be inspected at the same time, the inspection time is shortened. After practical operation, the inspection time is 4-6s, which effectively improves the inspection efficiency.

[0040] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A combined fixture integrating hole detection and keyway detection, characterized in that: It includes a sleeve for detecting the keyway on the crankshaft and a detection rod for detecting the threaded hole. A through inner hole is arranged on the sleeve along its axial direction. One end of the detection rod extends to the inner hole and is slidably connected to the sleeve. A flat key is also arranged on the hole wall of the inner hole, and the flat key is arranged along the axial direction of the inner hole.

2. The combined fixture for integrating hole detection and keyway detection according to claim 1, characterized in that: The inner hole includes two sections of mutually connected limiting holes and mounting holes, the aperture of the limiting hole is larger than the aperture of the mounting hole, and the axes of the limiting hole and the mounting hole overlap with the center line of the sleeve, the detection rod passes through the mounting hole and extends into the limiting hole, the detection rod is slidably connected to the hole wall of the mounting hole, and the flat key is arranged on the hole wall of the limiting hole.

3. The combined fixture for integrating hole detection and keyway detection according to claim 2, characterized in that: The hole wall of the limiting hole is also provided with an installation groove, one side of the flat key is fixed in the installation groove by a fastener, and the other side protrudes from the installation groove located in the limiting hole for matching with the keyway on the crankshaft.

4. A combined fixture for integrating hole detection and keyway detection according to any one of claims 1 to 3, characterized in that: The sleeve wall is also provided with an exhaust hole, which is communicated with the inner hole.

5. The combined fixture for integrating hole detection and keyway detection according to claim 4, characterized in that: The exhaust hole and the flat key are in the same radial direction of the sleeve.

6. The combined fixture for integrating hole detection and keyway detection according to claim 5, characterized in that: The wall roughness of the inner hole is less than 0.

4.

7. The combined fixture for integrating hole detection and keyway detection according to claim 1, characterized in that: One end of the detection rod located outside the inner hole is provided with a terminal head. When the portion of the detection rod located at the inner hole is completely inserted into the threaded hole of the crankshaft, the end of the terminal head abuts against the end of the sleeve.

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