Rocker arm profile tolerance measuring tool

Abstract

The utility model discloses a rocker arm profile tolerance measuring tool, which comprises a base, the surface of the base is provided with a groove, and the shape of the groove is designed according to the standard specification of a rocker arm; the positioning pins are arranged on the base, and the multiple positioning pins penetrate through a head through hole and a tail through hole of the rocker arm to be detected respectively to position and fix the rocker arm to be detected; the measuring pin is inserted between the groove and the rocker arm to be measured so as to judge whether the rocker arm to be measured meets the standard specification range, the size of the measuring pin is designed according to the standard specifications of the head and the tail of the rocker arm to be measured, and the measuring pin is provided with a stepped shaft structure. According to the method, the conventional quantitative analysis can be changed into qualitative analysis, so that the inspection efficiency is improved, the three-coordinate productivity is released, and the labor cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of rocker arm measurement, and in particular to a rocker arm contour measuring tool. Background Art

[0002] Profile: describes the accuracy of the shape of a surface or curve. The main indicator used to describe the accuracy of surface dimensions is profile error, which refers to the variation of the actual profile being measured relative to the ideal profile, with or without a reference.

[0003] At present, there are several methods for measuring part profile:

[0004] First, use the contour template for measurement. First, make a standard contour template according to the drawing requirements, and then use the light gap method to use this template to check the contour error of the convex or concave model surface;

[0005] Second, use the profiling template for measurement. The part and the processed standard profile template can be placed on the same platform and adjusted to the same height. The position of the measured part relative to the profiling system and the profile template is adjusted, and the indicator needle is adjusted to zero. Then the profiling probe is moved along a certain section of the profile template. The indicator needle will display the reading on the measured part. Take twice the maximum reading value of the indicator needle relative to the zero value as the profile error of the part.

[0006] The third is the coordinate measurement method. Use a three-coordinate measuring instrument to measure the parts, compare the contour formed by the dots with the ideal contour, and calculate the contour degree.

[0007] Fourth, measurements can be made using a projector and a tool microscope.

[0008] The existing measurement method requires the parts to be fixed during measurement, and the part reference surfaces A, B, C and the measured surface must be marked respectively. It takes about 3 minutes to measure each part, and the inspection efficiency is low. At the same time, the part output is large, the three-coordinate production capacity is insufficient, and the labor cost is relatively wasted. Utility Model Content

[0009] In view of this, the main purpose of this application is to provide a rocker arm contour measuring tool, which changes the previous quantitative analysis into qualitative analysis, so as to improve the inspection efficiency, release the three-coordinate production capacity and save labor costs.

[0010] The present application provides a rocker arm profile measuring tool, which comprises:

[0011] A base, the surface of which is provided with a groove, wherein the shape of the groove is designed according to the standard specifications of the rocker arm;

[0012] A positioning pin is arranged on the base, and a plurality of the positioning pins are arranged, and the positioning pins respectively pass through the head through hole and the tail through hole of the rocker arm to be tested, so as to provide positioning and fixation for the rocker arm to be tested;

[0013] A measuring pin is inserted between the groove and the rocker arm to be tested to determine whether the rocker arm to be tested meets the standard specification range, wherein the size of the measuring pin is designed according to the standard specifications of the head and tail of the rocker arm to be tested, and the measuring pin has a stepped shaft structure.

[0014] As shown above, a groove matching the shape of the rocker arm to be tested is designed on the base, and a locating pin is provided in the groove at a position relative to the through hole on the rocker arm to be tested. The rocker arm to be tested is positioned by the locating pin, and the locating pin prevents the rocker arm to be tested from shaking on the base. The measuring pin is inserted between the rocker arm to be tested and the groove, and the insertion result is used to determine whether the rocker arm to be tested meets the standard specification range of the same rocker arm, thereby changing the previous quantitative analysis into qualitative analysis, saving inspection time and improving inspection efficiency.

[0015] Optionally, the positioning pin has a stepped structure, wherein the size of the upper end of the positioning pin is smaller than the size of the lower end thereof.

[0016] From the above, the upper end size of the locating pin is smaller than the lower end size to form a stepped structure. When the locating pin is inserted into the through hole of the base, the larger lower end size can fix the locating pin tightly on the base, providing positioning and fixing functions for the rocker arm to be tested.

[0017] Optionally, the dimension of the upper end of the measuring pin is larger than the dimension of the lower end thereof, and the length ratio of the dimension of the upper end of the measuring pin to the dimension of the lower end thereof is 2.5:1.

[0018] From the above, the upper end of the measuring pin is long and the lower end is short, forming the shoulder of the measuring pin; if the size of the rocker arm to be measured is within the standard range, the shoulder of the measuring pin will be just stuck on the rocker arm to be measured, and while ensuring that the length ratio of the upper and lower ends of the measuring pin is 2.5:1, the longest dimension of the lower end is not greater than the depth of the groove.

[0019] Optionally, a plurality of measuring pins are provided, and according to different locations of the rocker arm to be measured, the upper ends of the plurality of measuring pins have different sizes, and the lower ends of the plurality of measuring pins have the same size.

[0020] From the above, in order to qualitatively measure whether the head size and tail size of the rocker arm to be tested meet the standard range, a plurality of measuring pins of different sizes are provided. However, since the lower end of the measuring pin needs to be inserted into the gap between the rocker arm to be tested and the groove, and the gap spacing between the rocker arm of standard size and the groove is fixed, the lower end sizes of the plurality of measuring pins are the same.

[0021] Optionally, the length ratio of the upper end dimension of the locating pin to the lower end dimension of the locating pin is 5:6.

[0022] From the above, the upper end of the locating pin is short, the lower end is long, and the length ratio is designed to be 5:6, which is the best embodiment for a specific type of rocker arm.

[0023] Optionally, the main body sizes of the plurality of positioning pins are different according to different locations where the rocker arm to be tested is fixed.

[0024] As can be seen from the above, the outer contour dimensions of the head and tail of the rocker arm to be tested are different, and the through hole dimensions of the head and tail are also different, so the dimensions of different positioning pins passing through the multiple through holes are also different.

[0025] In summary, the rocker arm contour measuring tool provided by the present application is composed of a base, a positioning pin and a measuring pin. The upper surface of the base is provided with a groove shape according to the outer contour of the rocker arm to be measured, and the outer contour size of the groove is larger than the standard outer contour size of the rocker arm by the value of the lower end diameter of the measuring pin. The positioning pin is provided on the base and is adapted to the position of the through hole of the rocker arm. The rocker arm to be measured is positioned and fixed by the positioning pin, and then the measuring pin is used to insert the gap between the rocker arm to be measured and the groove. If the measuring pin can be inserted into the gap and the shoulder of the measuring pin can just clamp the upper surface of the rocker arm to be measured, it indicates that the rocker arm to be measured meets the standard specification range. Otherwise, the contour of the rocker arm to be measured does not meet the standard specification range. This method uses the through hole of the rocker arm to be measured for positioning, and uses the pin method to determine whether the contour of the rocker arm to be measured meets the standard specification range. It changes from the previous quantitative analysis to qualitative analysis, and the inspection time of a single rocker arm is reduced from 3 minutes to about 0.5 minutes, which improves the inspection efficiency, releases the three-coordinate production capacity, and saves labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The various technical features of the present application and the relationship between them are further explained below with reference to the accompanying drawings. The accompanying drawings are exemplary, and some technical features are not shown in actual proportion. In addition, some drawings may omit technical features that are commonly used in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features that are not essential for understanding and implementing the present application may be shown. In other words, the combination of the various technical features shown in the accompanying drawings is not used to limit the present application. In addition, throughout the present application, the same figure numbers refer to the same content. The specific description of the drawings is as follows:

[0027] Figure 1 is an example diagram of a rocker arm contour measuring tool in the present application;

[0028] Figure 2 is a schematic diagram of one of the measuring pins of a rocker arm contour measuring tool in the present application;

[0029] Figure 3 It is a schematic diagram of one of the positioning pins of a rocker arm contour measuring tool in the present application;

[0030] Figure 4 is a top view of an embodiment of a rocker arm contour measuring tool in the present application;

[0031] Figure 5 It is a flow chart of a method for performing qualitative measurement of a rocker arm to be measured using the rocker arm contour measuring tool in the present application.

[0032] Description of Reference Numerals

[0033] 1-base, 2-first positioning pin, 3-second positioning pin, 4-first measuring pin, 5-second measuring pin.

[0034] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The specific embodiments described below can be combined with each other to form new embodiments. The same or similar ideas or processes described in one embodiment may not be repeated in other embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0038] Figure 1 A specific embodiment of the rocker arm profile measuring tool of the present application is shown. Figure 1 As shown, the present application provides a rocker arm profile measuring tool, which includes:

[0039] A base 1, a surface of which is provided with a groove, wherein the shape of the groove is designed according to the standard specifications of the rocker arm;

[0040] A positioning pin is arranged on the base, and a plurality of the positioning pins are arranged, and the positioning pins respectively pass through the head through hole and the tail through hole of the rocker arm to be tested, so as to provide positioning and fixation for the rocker arm to be tested;

[0041] A measuring pin is inserted between the groove and the rocker arm to be tested to determine whether the rocker arm to be tested meets the standard specification range, wherein the size of the measuring pin is designed according to the standard specifications of the head and tail of the rocker arm to be tested, and the measuring pin has a stepped shaft structure.

[0042] Specifically, a groove matching the shape of the rocker arm to be tested is designed on the base 1, and a positioning pin is provided on the base at a position relative to the through hole on the rocker arm to be tested. The rocker arm to be tested is positioned by the positioning pin, and the positioning pin prevents the rocker arm to be tested from shaking on the base. The measuring pin is inserted between the rocker arm to be tested and the groove, and the insertion result is used to determine whether the rocker arm to be tested meets the standard specification range of the same rocker arm, thereby changing the previous quantitative analysis into qualitative analysis, saving inspection time and improving inspection efficiency.

[0043] exist Figure 1In the embodiment shown, the first positioning pin 2 and the second positioning pin 3 are used to locate the position of the rocker arm to be measured, the first measuring pin 4 is used to detect the contour of the rocker arm size 47 to be measured, and the second measuring pin 5 is used to detect the contour of the rocker arm size 39 to be measured. Three threaded holes are respectively provided on both sides of the upper surface of the base 1, which can fix the base 1. A groove is provided in the middle position of the upper surface of the base 1, and the outer contour of the groove is similar to the outer contour of the rocker arm, but the outer contour of the groove is larger than the standard outer contour of the rocker arm; the two positioning pins respectively locate the head through hole and the tail through hole of the rocker arm to be measured, and after the rocker arm to be measured is fixed on the base, the two measuring pins are used to measure the size of the head and tail of the rocker arm to be measured to see if they meet the standard specification range, wherein the standard specification range is between the outer boundary of the contour tolerance and the inner boundary of the contour tolerance, that is, the standard specification of the rocker arm itself has a specific size, and the standard specification range is a certain distance within the size. Assuming that the width between the groove and the rocker arm to be measured is 5mm, and the diameter of the lower end of the measuring pin is 5mm, if the contour of the rocker arm to be measured reaches the outer boundary of the contour tolerance, the measuring pin can just be inserted into the gap between the groove and the rocker arm to be measured, and the shoulder of the measuring pin is stuck on the rocker arm to be measured; if the contour of the rocker arm to be measured exceeds the outer boundary of the contour tolerance, the size of the rocker arm to be measured is too large, and the width leaked between the groove and the rocker arm to be measured is less than 5mm, resulting in interference, so that the measuring pin cannot be inserted into the gap between the groove and the rocker arm to be measured; if the contour of the rocker arm to be measured exceeds the inner boundary of the contour tolerance, the size of the rocker arm to be measured is too small, and the rocker arm to be measured lacks meat, so that although the measuring pin can be inserted into the gap between the groove and the rocker arm to be measured, the shoulder of the measuring pin cannot be stuck on the rocker arm to be measured.

[0044] Optionally, the dimension of the upper end of the measuring pin is larger than the dimension of the lower end thereof, and the length ratio of the dimension of the upper end of the measuring pin to the dimension of the lower end thereof is 2.5:1.

[0045] Specifically, the upper end of the measuring pin is long and the lower end is short, forming the shoulder of the measuring pin; if the size of the rocker arm to be measured is within the standard range, the shoulder of the measuring pin will be just stuck on the rocker arm to be measured, and while ensuring that the length ratio of the upper and lower ends of the measuring pin is 2.5:1, the longest dimension of the lower end is not greater than the depth of the groove.

[0046] Optionally, a plurality of measuring pins are provided, and according to different locations of the rocker arm to be measured, the upper ends of the plurality of measuring pins have different sizes, and the lower ends of the plurality of measuring pins have the same size.

[0047] Specifically, in order to qualitatively measure whether the head size and tail size of the rocker arm to be tested meet the standard range, a plurality of measuring pins of different sizes are provided. However, since the lower end of the measuring pin needs to be inserted into the gap between the rocker arm to be tested and the groove, and the gap spacing between the rocker arm of standard size and the groove is fixed, the lower end sizes of the plurality of measuring pins are the same.

[0048] Figure 2 The structure diagram of one of the measuring pins of a rocker arm contour measuring tool in the present application is shown; Figure 2 As shown, the measuring pin has a stepped shaft structure, and the shoulder part maintains a sharp edge. Since the length ratio of the upper and lower ends of the measuring pin is 2.5:1, the upper end length of the measuring pin can be set to 25mm, and the lower end length can be set to 10mm; since the lower end of the measuring pin needs to be inserted into the groove, the lower end diameter of the measuring pin is small and can be set to 5mm, with an accuracy of 0.005mm; the upper end diameter of the measuring pin is large, and two measuring pins are provided to measure different parts of the rocker arm to be measured. Since the tail and head of the rocker arm are different in size, the upper end diameter of the first measuring pin 4 measuring the size of the tail of the rocker arm can be set to 5.32mm, with an accuracy of 0.005mm, and the upper end diameter of the second measuring pin 5 measuring the size of the head of the rocker arm can be set to 5.1mm, with an accuracy of 0.005mm. The measuring pins for measuring the head and tail of the rocker arm can be distinguished by the size of the upper end of the measuring pin.

[0049] Optionally, the positioning pin has a stepped structure, wherein the size of the upper end of the positioning pin is smaller than the size of the lower end thereof.

[0050] Specifically, the size of the upper end of the positioning pin is smaller than that of the lower end to form a stepped structure. When the positioning pin is inserted into the through hole of the base, the larger size of the lower end can tightly fix the positioning pin in the groove, providing positioning and fixing functions for the rocker arm to be tested.

[0051] Optionally, the length ratio of the upper end dimension of the locating pin to the lower end dimension of the locating pin is 5:6.

[0052] Specifically, the upper end of the locating pin is short, the lower end is long, and the length ratio is designed to be 5:6, which is the best embodiment for a specific type of rocker arm.

[0053] Optionally, the main body sizes of the plurality of positioning pins are different according to different locations where the rocker arm to be tested is fixed.

[0054] Specifically, the outer contour dimensions of the head and tail of the rocker arm to be tested are different, and the dimensions of the through holes of the head and tail are also different, so the dimensions of different positioning pins passing through the multiple through holes are also different.

[0055] Figure 3 The structure diagram of one of the positioning pins of a rocker arm contour measuring tool in the present application is shown as follows: Figure 3As shown, for the same type of products, the heights of multiple locating pins are fixed, and the length ratio of their stepped upper and lower ends is also fixed; for the same model of rocker arms, the length ratio of the upper and lower ends of the locating pins is 5:6, wherein the upper end diameter of the first locating pin 2 for locating the through hole at the tail of the rocker arm to be tested can be set to 4.9 mm, and the lower end diameter of the first locating pin 2 can be set to 5 mm; the upper end diameter of the second locating pin 3 for locating the through hole at the head of the rocker arm to be tested can be set to 3.8 mm, and the lower end diameter of the second locating pin 3 can be set to 4 mm.

[0056] Figure 4 is a top view of an embodiment of a rocker arm contour measuring tool in the present application; Figure 4 As shown, the outer contour of the groove on the upper surface of the base 1 is similar to the outer contour of the rocker arm, the distance from one side of the base 1 to the center of the fixing hole of the first locating pin 2 can be set to 26mm, the distance between the center of the fixing hole of the first locating pin 2 and the center of the fixing hole of the second locating pin 3 can be set to 32.55mm, and the standard width between the groove and the rocker arm is 5mm.

[0057] Figure 5 The process of using the rocker arm contour measuring tool to perform qualitative measurement of the rocker arm to be measured is shown. Figure 5 As shown, the present application provides a method for qualitatively measuring a rocker arm to be measured using the rocker arm profile measuring tool described above, which comprises:

[0058] Step S1: Fix the rocker arm to be measured on the base 1 through the positioning pin on the base 1 of the rocker arm contour measuring tool;

[0059] Step S2: Place the measuring pin between the rocker arm to be tested and the groove on the base 1 to determine whether the rocker arm to be tested meets the standard specification range, wherein the standard specification range is between the outer boundary of the profile tolerance and the inner boundary of the profile tolerance:

[0060] If the lower end of the measuring pin is placed in the groove and the shoulder of the measuring pin is stuck on the rocker arm to be measured, it means that the profile of the rocker arm to be measured is within the standard specification range.

[0061] If the lower end of the measuring pin cannot be placed in the groove, it means that the profile of the rocker arm to be measured exceeds the outer boundary of the profile tolerance.

[0062] If the lower end of the measuring pin is placed in the groove, but the shoulder of the measuring pin cannot be stuck on the rocker arm to be measured, it means that the contour of the rocker arm to be measured exceeds the inner boundary of the contour tolerance.

[0063] Specifically, the method in the present application uses a positioning pin to both position the rocker arm to be tested and fix the rocker arm to be tested on the groove of the base 1. The contour line of the groove is designed to be in the shape of the rocker arm to be tested, which is convenient for placing the rocker arm to be tested into the groove. The measuring pin is inserted into the gap between the inner wall of the groove and the rocker arm to be tested by using a latch method to determine whether the contour of the rocker arm to be tested meets the standard, thereby transforming the traditional quantitative analysis into a qualitative analysis, and reducing the inspection time of a single part from 3 minutes to about 0.5 minutes, thereby improving the inspection efficiency, releasing the three-coordinate production capacity, and saving labor costs.

[0064] In an optional embodiment of the present application, the measuring pin includes a first measuring pin 4 and a second measuring pin 5. The first measuring pin 4 measures the contour of the head of the rocker arm to be measured, and the second measuring pin 5 measures the contour of the tail of the rocker arm to be measured.

[0065] Specifically, based on the size comparison of the head contour and the tail contour of the rocker arm to be tested, the size designs of the first measuring pin 4 and the second measuring pin 5 are different. When measuring different parts of the rocker arm to be tested, it is necessary to use corresponding measuring pins to improve the inspection accuracy.

[0066] In an optional embodiment of the present application, the first measuring pin 4 is measured along various points of the head of the rocker arm to be tested to determine whether various points of the head of the rocker arm to be tested meet the standard specification range; the second measuring pin 5 is measured along various points of the tail of the rocker arm to be tested to determine whether various points of the tail of the rocker arm to be tested meet the standard specification range.

[0067] Specifically, when the inspector uses the rocker arm contour measuring tool, he first installs the rocker arm to be tested on the groove of the base 1, uses the first measuring pin 4 to measure various points along the head of the rocker arm to determine whether its head size meets the standard, and uses the second measuring pin 5 to measure various points at the tail of the rocker arm to determine whether its tail size meets the standard.

[0068] In summary, the rocker arm contour measuring tool provided by the present application is composed of a base 1, a positioning pin and a measuring pin. The upper surface of the base 1 is provided with a groove shape according to the outer contour of the rocker arm to be measured, and the outer contour size of the groove is larger than the standard outer contour size of the rocker arm by the value of the lower end diameter of the measuring pin. The positioning pin is provided on the base and is adapted to the through hole position of the rocker arm. The rocker arm to be measured is positioned and fixed by the positioning pin, and then the measuring pin is inserted into the gap between the rocker arm to be measured and the groove. If the measuring pin can be inserted into the gap and the shoulder of the measuring pin can just clamp the upper surface of the rocker arm to be measured, it indicates that the rocker arm to be measured meets the standard specification range. Otherwise, the contour of the rocker arm to be measured does not meet the standard specification range. The method uses the through hole of the rocker arm to be measured for positioning, and uses the pin method to determine whether the contour of the rocker arm to be measured meets the standard specification range. It changes from the previous quantitative analysis to qualitative analysis, and the inspection time of a single rocker arm is reduced from 3 minutes to about 0.5 minutes, which improves the inspection efficiency, releases the three-coordinate production capacity, and saves labor costs.

[0069] Unless otherwise defined, all technical and scientific terms used in this application are the same as those generally understood by those skilled in the art to which this application belongs. If there is any inconsistency, the meaning described in the full text of this application or the meaning derived from the content recorded in the full text of this application shall prevail. In addition, the terms used in this description are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0070] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the technical concept of the present application, all of which belong to the protection scope of the present application.

[0071] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A rocker arm profile measuring tool, characterized in that: include: A base, the surface of which is provided with a groove, wherein the shape of the groove is designed according to the standard specifications of the rocker arm; A positioning pin is arranged on the base, and a plurality of the positioning pins are arranged, and the positioning pins respectively pass through the head through hole and the tail through hole of the rocker arm to be tested, so as to provide positioning and fixation for the rocker arm to be tested; A measuring pin is inserted between the groove and the rocker arm to be tested to determine whether the rocker arm to be tested meets the standard specification range, wherein the size of the measuring pin is designed according to the standard specifications of the head and tail of the rocker arm to be tested, and the measuring pin has a stepped shaft structure.

2. The rocker arm profile measuring tool according to claim 1, characterized in that: The positioning pin has a stepped structure, wherein the size of the upper end of the positioning pin is smaller than the size of the lower end thereof.

3. The rocker arm profile measuring tool according to claim 1, characterized in that: The size of the upper end of the measuring pin is larger than the size of the lower end thereof, and the length ratio of the size of the upper end of the measuring pin to the size of the lower end thereof is 2.5:

1.

4. The rocker arm contour measuring tool according to claim 3, characterized in that: There are multiple measuring pins. According to different locations of the rocker arm to be measured, the upper ends of the multiple measuring pins have different sizes, and the lower ends of the multiple measuring pins have the same size.

5. The rocker arm contour measuring tool according to claim 2, characterized in that: The length ratio of the upper end dimension of the positioning pin to the lower end dimension of the positioning pin is 5:

6.

6. The rocker arm contour measuring tool according to claim 5, characterized in that: According to different locations where the rocker arm to be tested is fixed, the main body sizes of the plurality of positioning pins are different.

Images