Oil sprayer bush measuring device

Abstract

The utility model relates to the technical field of measuring devices, in particular to a fuel injector bush measuring device. The measuring device comprises a detection sleeve; the detection sleeve comprises an outer cylindrical surface of the outer contour and an inner threaded hole of the inner contour, the inner threaded hole and the outer cylindrical surface are coaxially arranged, the inner threaded hole of the detection sleeve is installed on the threaded section of the bushing, the inner end face of the detection sleeve is perpendicular to the outer cylindrical surface, and the inner end face abuts against the step surface of the root of the threaded section; the axial length of the detection sleeve is larger than that of the threaded section of the bushing, and a plurality of open grooves are formed in the end, abutting against the step face, of the detection sleeve in the circumferential direction of the detection sleeve. According to the utility model, the measurement efficiency is improved on the premise of ensuring the measurement precision.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a measuring device for a fuel injector bushing. Background Art

[0002] As the degree of engine strengthening increases, the requirements for sealing reliability also increase. The injector bushing is a key component of the engine. Common sealing methods include riveting and threaded connection. The accuracy of threaded connection directly affects the overall performance and sealing effect of the engine. For bushings with threaded connection structure, the outer shaft is generally defined as the main reference, the inner and outer surfaces of the step are marked with verticality relative to the main reference, and the remaining hole shaft segments including the threaded segments are marked with coaxiality relative to the main reference.

[0003] At present, the coaxiality measurement of the threaded section of the injector bushing is generally carried out using a three-dimensional coordinate measuring machine. Some suppliers use the optical axis (the optical axis before the thread is processed) instead of the thread evaluation, and some use the large diameter evaluation and do not control the measurement object for evaluation. However, except for the large diameter measurement, the other two methods cannot accurately evaluate the thread.

[0004] The measurement of the major diameter is to fit the thread cylinder by taking points from multiple sections to evaluate its related characteristics. Specifically, it is necessary to manually take points on the external thread line of the thread segment during measurement. On the one hand, due to the shape characteristics of the external thread line, it is necessary to take points at multiple positions in the axial and radial directions, which is time-consuming and laborious, and it is easy to take a thread groove if you are not careful, which seriously affects the measurement accuracy of the thread segment. On the other hand, the thread segment of the injector bushing is short and thread-shaped, which also makes it impossible to obtain enough measurement points and then fit the thread cylinder by taking points from multiple sections, so it is impossible to accurately evaluate its related characteristics. Therefore, there has been no better evaluation method for the coaxiality measurement of the thread segment of the injector bushing. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide an injector bushing measurement device to improve the measurement efficiency while ensuring the measurement accuracy.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] A fuel injector bushing measuring device is used to measure the threaded section at the end of the fuel injector, the measuring device comprising a detection sleeve; the detection sleeve comprises an outer cylindrical surface of an outer contour and an inner threaded hole of an inner contour, the inner threaded hole is coaxially arranged with the outer cylindrical surface, the inner threaded hole of the detection sleeve is installed on the threaded section of the bushing, the inner end surface of the detection sleeve is perpendicularly arranged with the outer cylindrical surface, and the inner end surface abuts on the step surface at the root of the threaded section; the axial length of the detection sleeve is greater than the axial length of the bushing threaded section, an end of the detection sleeve abutting the step surface is provided with an open groove, and a plurality of the open grooves are provided along the circumference of the detection sleeve.

[0008] Optionally, the axial end of the open groove is open, and the open groove divides the end of the detection sleeve abutting against the step surface of the bushing into a plurality of support platforms, the support platforms abut against the step surface, and the circumferential gaps between the support platforms form a accommodating space for detecting the verticality of the step surface.

[0009] Optionally, the axial length of the open groove is greater than the axial length of the threaded section of the bushing, and the open groove passes through the outer cylindrical surface and the internal threaded hole of the detection sleeve.

[0010] Optionally, at least three opening grooves are provided, and all the opening grooves are evenly arranged on the detection sleeve in a circular array around the axis of the detection sleeve.

[0011] Optionally, three opening slots are provided, and the angle between adjacent opening slots is 120 degrees.

[0012] Optionally, the cross-section of the opening groove in the radial direction is rectangular.

[0013] Optionally, the cross-section of the opening groove in the radial direction is semicircular, and the straight side of the semicircle is located at the end of the detection sleeve.

[0014] Optionally, the cross-section of the open groove in the radial direction is a triangle, and one side of the triangle is located at the end of the detection sleeve.

[0015] Optionally, the detection sleeve is made of metal.

[0016] Optionally, the measuring device also includes a three-jaw chuck and a measuring head, the three-jaw chuck is clamped on one end of the bushing away from the threaded section, and the measuring head is used to abut against the outer cylindrical surface of the bushing and inserted into the open groove to abut against the step surface at the root of the threaded section.

[0017] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0018] 1. The core component of the measuring device is the detection sleeve, which consists of an outer cylindrical surface and an inner threaded hole, which are coaxially arranged to ensure the accuracy of the measurement. During the inspection, the inner threaded hole of the detection sleeve is installed on the threaded section of the bushing, and the outer cylindrical surface is used instead of the threaded section to indirectly evaluate the coaxiality of the threaded section. Compared with the existing detection methods, there is no need to take points along the spiral external thread line, which reduces the difficulty of operation, and there is no situation of taking the thread groove, thus ensuring the measurement accuracy. Moreover, by making the axial length of the detection sleeve greater than the axial length of the threaded section, the detection data of the farther axial position can be obtained, and even if there is a small coaxiality error, it can be accurately detected, which improves the accuracy and efficiency of the bushing thread measurement, while ensuring the consistency of the measurement results.

[0019] 2. The end of the detection sleeve is provided with a plurality of open grooves. This structure allows the end face of the detection sleeve to be butted against the step surface of the bushing, lengthens the connection length between the detection sleeve and the bushing threaded section, improves the installation stability of the detection sleeve, and simultaneously positions the detection sleeve through the bushing threaded section and the step surface at the root, which can more realistically reflect the relevant characteristics of the threaded section. At the same time, the detection head can be inserted into the open groove to detect the verticality characteristics of the step surface, which takes into account the measurement of the verticality of the step surface while accurately measuring the threaded section, ensuring the comprehensiveness and accuracy of the measurement, and improving work efficiency and judgment accuracy.

[0020] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a three-dimensional diagram of the detection set provided by the embodiment of the utility model;

[0023] Figure 2 It is a cross-sectional view of a detection sleeve provided by an embodiment of the utility model;

[0024] Figure 3 It is a stereoscopic diagram of the detection sleeve provided by the embodiment of the utility model installed on the bushing;

[0025] Figure 4 It is a front view of the detection sleeve provided by the embodiment of the utility model installed on the bushing;

[0026] Figure 5 is a cross-sectional view of a detection sleeve provided by an embodiment of the utility model installed on a bushing;

[0027] In the figure: 1. detection sleeve; 11. outer cylindrical surface; 12. internal threaded hole; 13. open groove; 2. bushing; 21. threaded section; 3. three-jaw chuck; 4. measuring head;

[0028] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] As introduced in the background technology, when measuring threads, optical axis is usually used as a substitute or only the major diameter is measured. These methods cannot accurately evaluate the true condition of the threads. The method of using a measuring head to measure all the features of the bushing multiple times and fitting the thread cylinder to evaluate its characteristics has some limitations. It is not only time-consuming and labor-intensive, but also the evaluation of multiple measurements such as thread measurement is prone to deviation. Therefore, the problems existing in the prior art mainly include:

[0031] 1. The measurement method cannot accurately evaluate the true characteristics of the thread, especially when an optical axis is used instead or only the major diameter is measured.

[0032] 2. The manual point selection method is prone to errors, which is not only time-consuming and labor-intensive, but also increases the complexity and error rate of measurement.

[0033] In order to solve the above technical problems, the utility model proposes a fuel injector bushing measuring device, which can complete the measurement of relevant features at one time while ensuring the accuracy of thread measurement, thereby improving measurement efficiency and evaluation consistency. Through innovative design, the problems existing in the prior art are solved to achieve a more efficient and accurate bushing thread measurement method.

[0034] The fuel injector bushing measuring device comprises a detection sleeve, which is used to measure the coaxiality of the threaded section at the end of the fuel injector and the verticality of the step surface at the root of the threaded section.

[0035] like Figure 1 As shown, the detection sleeve 1 includes an outer cylindrical surface 11 of an outer contour and an inner threaded hole 12 of an inner contour, and the inner threaded hole 12 is coaxially arranged with the outer cylindrical surface 11 (as shown in FIG. Figure 2 ), the internal threaded hole 12 of the detection sleeve 1 is installed on the threaded section 21 of the bushing 2 (such as Figure 3 , Figure 4 , Figure 5As shown), the inner end surface of the detection sleeve 1 (ie Figure 2 The middle and lower end surface) is arranged perpendicularly to the outer cylindrical surface 11, and the inner end surface (i.e. Figure 5 The left end surface in the middle abuts against the step surface at the root of the threaded segment 21.

[0036] The axial length of the detection sleeve 1 is greater than the axial length of the threaded section 21 of the bushing 2 . An open groove 13 is provided at one end of the detection sleeve 1 abutting against the step surface. A plurality of open grooves 13 are provided along the circumference of the detection sleeve 1 .

[0037] The core matching tolerance of the detection sleeve 1 is that the internal threaded hole 12 of the tooling and the threaded section 21 of the bushing 2 adopt a small clearance match, the inner hole of the detection sleeve 1 and the outer cylindrical surface 11 adopt a stricter coaxiality control, and the outer cylindrical surface 11 and the end face adopt a stricter perpendicularity control.

[0038] The core component of the measuring device is the detection sleeve 1, which consists of an outer cylindrical surface 11 and an inner threaded hole 12, which are coaxially arranged to ensure the accuracy of the measurement. During the inspection, the inner threaded hole 12 of the detection sleeve 1 is installed on the threaded segment 21 of the bushing 2, and the outer cylindrical surface 11 is used to replace the threaded segment 21 to indirectly evaluate the coaxiality of the threaded segment 21. Compared with the existing detection method, there is no need to take points along the spiral external thread line, which reduces the difficulty of operation, and there is no situation of taking the thread groove, thereby ensuring the measurement accuracy. Moreover, by making the axial length of the detection sleeve 1 greater than the axial length of the threaded segment 21, the detection data of the farther axial position can be obtained, and even if there is a small coaxiality error, it can be accurately detected, which improves the accuracy and efficiency of the bushing 2 thread measurement, while ensuring the consistency of the measurement results.

[0039] When using a conventional annular detection sleeve 1 for measurement, if the inner end face of the detection sleeve 1 is abutted against the step surface at the root of the threaded segment 21, the connection length between the detection sleeve 1 and the bushing 2 can be guaranteed to ensure stability. However, in this case, the verticality of the step surface at the root of the threaded segment 21 cannot be detected, which affects the comprehensiveness and accuracy of the measurement. If the inner end face of the detection sleeve 1 is separated from the step surface at the root of the threaded segment 21 by a certain distance, the connection length between the detection sleeve 1 and the bushing 2 threaded segment 21 will be too short, and the stable installation of the detection sleeve 1 cannot be guaranteed, and the coaxiality characteristics of the threaded segment 21 cannot be accurately reflected.

[0040] Based on this, a plurality of open grooves 13 are provided at the end of the detection sleeve 1. This structure can make the end face of the detection sleeve 1 butt against the step surface of the bushing 2, lengthen the connection length between the detection sleeve 1 and the threaded section 21 of the bushing 2, improve the installation stability of the detection sleeve 1, and simultaneously position the detection sleeve 1 through the threaded section 21 and the step surface of the root of the bushing 2, which can more realistically reflect the relevant characteristics of the threaded section 21. At the same time, the detection head can be inserted into the open groove 13 to detect the verticality characteristics of the step surface, accurately measuring the threaded section 21 while taking into account the measurement of the verticality of the step surface, ensuring the comprehensiveness and accuracy of the measurement, and improving work efficiency and judgment accuracy.

[0041] The axial end of the opening groove 13 is open, and the opening groove 13 divides the end of the detection sleeve 1 that abuts against the step surface of the bushing 2 into multiple support platforms, and the support platforms abut on the step surface. The circumferential gaps between the support platforms form an accommodation space for detecting the verticality of the step surface. This design is not only convenient for placing the measuring head 4, but also can more accurately evaluate the verticality of the step surface to the outer shaft through the gap distribution of the support platforms.

[0042] like Figure 5 As shown, the axial length of the opening groove 13 is greater than the axial length of the threaded section 21 of the bushing 2, which not only provides sufficient space for the measuring head 4, but also further improves the measurement accuracy by moving the detection position outward along the axial direction. The opening groove 13 passes through the outer cylindrical surface 11 and the internal threaded hole 12 of the detection sleeve 1, so that the inner circle of the step surface can also be detected, thereby comprehensively improving the measurement accuracy.

[0043] At least three opening slots 13 are provided, and all the opening slots 13 are evenly arranged on the detection sleeve 1 in a circular array around the axis of the detection sleeve 1. Such a layout can ensure uniformity and balance during measurement, and avoid measurement deviation caused by uneven distribution of the opening slots 13. In this embodiment, three opening slots 13 are provided, and the angle between adjacent opening slots 13 is 120 degrees.

[0044] The shape of the opening slot 13 can be in various forms:

[0045] like Figure 1 As shown, the cross section of the opening slot 13 in the radial direction is a rectangle. This design is more convenient for processing and manufacturing, while ensuring the structural stability and functionality of the opening slot 13.

[0046] In another embodiment, the cross section of the opening groove 13 in the radial direction is semicircular, and the straight side of the semicircle is located at the end of the detection sleeve 1. This design enhances the structural strength of the detection sleeve 1 without interfering with the step surface detection, and increases the matching surface with the threaded segment 21, thereby improving the reliability of the measurement.

[0047] In another embodiment, the cross section of the opening groove 13 in the radial direction is a triangle, and one side of the triangle is located at the end of the detection sleeve 1. This design also enhances the strength of the detection sleeve 1 without affecting the step surface detection, and expands the contact area with the threaded segment 21, further improving the stability of the measurement.

[0048] The detection sleeve 1 can be made of metal material, which provides the required strength and durability, while also ensuring the accuracy and reliability during the measurement process.

[0049] The measuring device also includes a three-jaw chuck 3 and a measuring head 4. The three-jaw chuck 3 is clamped at one end of the bushing 2 away from the threaded section 21. The measuring head 4 is used to abut against the outer cylindrical surface 11 of the bushing 2 and the step surface at the root of the threaded section 21 when inserted into the opening groove 13.

[0050] like Figure 3 As shown, the three-jaw chuck 3 is used to clamp the end of the bushing 2 away from the threaded section 21 to ensure the stability of the bushing 2 during the measurement process. The measuring head 4 is used to contact the outer cylindrical surface 11 of the detection sleeve 1 to measure the coaxiality of the threaded section 21. At the same time, the measuring head 4 is also used to insert into the open groove 13 and abut against the step surface at the root of the threaded section 21 to achieve accurate measurement. This configuration not only improves the measurement efficiency, but also ensures the accuracy and consistency of the measurement results through the coordinated work of the three-jaw chuck 3 and the measuring head 4.

[0051] Measuring principle: The bushing 2 is clamped and positioned by the three-jaw chuck 3, the detection sleeve 1 is tightened with the threaded section 21 of the bushing 2 and ensures that the end face fits the step surface of the bushing 2, the three-coordinate measuring head 4 measures the outer cylindrical surface 11 instead of the threaded section 21, and at the same time, the step surface at the root of the threaded section 21 can be detected to take points for fitting, thereby improving the measurement efficiency and accuracy.

[0052] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the protection scope of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the protection scope of the utility model.

Claims

1. A fuel injector bushing measuring device, used to measure the threaded section at the end of the fuel injector, characterized in that: The measuring device includes a detection sleeve; The detection sleeve comprises an outer cylindrical surface of an outer contour and an inner threaded hole of an inner contour, the inner threaded hole is coaxially arranged with the outer cylindrical surface, the inner threaded hole of the detection sleeve is installed on the threaded section of the bushing, the inner end surface of the detection sleeve is perpendicularly arranged with the outer cylindrical surface, and the inner end surface abuts against the step surface at the root of the threaded section; The axial length of the detection sleeve is greater than the axial length of the bushing threaded section, and an open groove is arranged at one end of the detection sleeve abutting against the step surface, and a plurality of the open grooves are arranged along the circumference of the detection sleeve.

2. The injector bushing measuring device according to claim 1, characterized in that: The axial end of the opening groove is open, and the opening groove divides the end of the detection sleeve abutting against the bushing step surface into a plurality of support platforms, the support platforms abut against the step surface, and the circumferential gaps between the support platforms form a receiving space for detecting the verticality of the step surface.

3. The injector bushing measuring device according to claim 1, characterized in that: The axial length of the opening groove is greater than the axial length of the threaded section of the bushing, and the opening groove passes through the outer cylindrical surface and the internal threaded hole of the detection sleeve.

4. The injector bushing measuring device according to claim 1, characterized in that: At least three opening grooves are provided, and all the opening grooves are evenly arranged on the detection sleeve in a circular array around the axis of the detection sleeve.

5. The injector bushing measuring device according to claim 4, characterized in that: There are three opening slots, and the angle between adjacent opening slots is 120 degrees.

6. The injector bushing measuring device according to claim 1, characterized in that: The cross section of the opening groove in the radial direction is rectangular.

7. The injector bushing measuring device according to claim 1, characterized in that: The cross section of the opening groove in the radial direction is semicircular, and the straight edge of the semicircle is located at the end of the detection sleeve.

8. The injector bushing measuring device according to claim 1, characterized in that: The cross section of the opening groove in the radial direction is a triangle, and one side of the triangle is located at the end of the detection sleeve.

9. The injector bushing measuring device according to claim 1, characterized in that: The detection sleeve is made of metal.

10. The injector bushing measuring device according to claim 1, characterized in that: The measuring device also includes a three-jaw chuck and a measuring head. The three-jaw chuck is clamped at one end of the bushing away from the threaded section. The measuring head is used to abut against the outer cylindrical surface of the bushing and inserted into the open groove to abut against the step surface at the root of the threaded section.

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