A method and device for measuring the coplanarity of a poly-V belt pulley of an engine

Abstract

The application provides a kind of engine poly V belt wheel coplanarity measurement method and measuring device, it is related to engine technical field, the measurement method includes: control the detection ball is placed in the reference wedge groove of reference poly V belt wheel, make the detection ball and the two side surfaces of reference wedge groove tangent;Control the hand-held three coordinates obtain a plurality of reference point coordinates;According to a plurality of reference point coordinates, determine reference plane;Control the hand-held three coordinates respectively place the detection ball in the reference wedge groove of other measured poly V belt wheel, and respectively obtain a plurality of measured point coordinates of the reference wedge groove of each measured poly V belt wheel;According to the reference wedge groove of each measured poly V belt wheel a plurality of measured point coordinates and reference plane, determine the engine poly V belt wheel coplanarity.Improves the measurement accuracy of the coplanarity of poly V belt wheel.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and specifically to a method and apparatus for measuring the coplanarity of multi-wedge pulleys in an engine. Background Technology

[0002] The coplanarity of a multi-ribbed pulley refers to the range of distances between the center surfaces of the corresponding conical wedge grooves on all multi-ribbed pulleys traversed by the same multi-ribbed belt. During engine operation, power is transmitted to the water pump and fan via the multi-ribbed belt and pulleys. However, some uncertainties exist during the trial production of new multi-ribbed pulleys. For example, the cumulative machining and assembly of various engine components can lead to axial deviations in the multi-ribbed pulley. Axial deviations in the multi-ribbed pulley can cause rapid wear or even breakage of the multi-ribbed belt after assembly. If a multi-ribbed belt breaks while the vehicle is in motion, it poses a significant safety hazard, and since vehicle owners cannot replace a broken multi-ribbed belt themselves, the accuracy requirements for the coplanarity of multi-ribbed pulleys are very high.

[0003] However, the measurement of the coplanarity of multi-ribbed pulleys can only be performed after all the multi-ribbed pulleys on the assembly line have been installed on the engine. At this time, multiple parts have already been installed around them, and the measurement space is small. When measuring the coplanarity of multi-ribbed pulleys, existing measuring devices rely heavily on the movement of the measuring device itself. The accuracy of the movement path of the measuring device itself will greatly affect the accuracy of the measurement results. Due to the small measurement space, the accuracy of moving the measuring device manually is low. Therefore, the accuracy of the measuring device is difficult to guarantee. Thus, existing technologies suffer from the problems of high measurement difficulty and low measurement accuracy. Summary of the Invention

[0004] This application provides a method and apparatus for measuring the coplanarity of multi-wedge pulleys in an engine, in order to solve at least one technical problem existing in the related art.

[0005] According to one aspect of the present application, a method for measuring the coplanarity of multi-wedge pulleys in an engine is provided. The engine includes multiple multi-wedge pulleys, and the method is applied to a multi-wedge pulley coplanarity measuring device. The multi-wedge pulley coplanarity measuring device includes: a handheld coordinate measuring machine and a probe ball fixedly disposed at the end of the handheld coordinate measuring machine probe, the end of the handheld coordinate measuring machine probe being located at the center of the probe ball. The measurement method includes: controlling the handheld coordinate measuring machine to place the probe ball in a reference wedge groove of a reference multi-wedge pulley, such that the probe ball is tangent to the two sides of the reference wedge groove; controlling the handheld coordinate measuring machine to acquire the coordinates of multiple reference points; determining a reference plane based on the coordinates of the multiple reference points; controlling the handheld coordinate measuring machine to place the probe ball in the reference wedge grooves of other multi-wedge pulleys to be measured, and acquiring the coordinates of multiple measured points of the reference wedge groove of each multi-wedge pulley to be measured; determining the coplanarity of the engine multi-wedge pulleys based on the coordinates of the multiple measured points of the reference wedge groove of each multi-wedge pulley to be measured and the reference plane.

[0006] As an optional implementation, the diameter of the probe ball is less than or equal to the maximum width of the reference wedge groove.

[0007] As an optional implementation, the coordinates of the reference point and the coordinates of the measured point are both the coordinates of the center of the probe ball when the probe ball is tangent to the two sides of the reference wedge groove.

[0008] As an optional implementation, the reference multi-wedge pulley is a crankshaft pulley; the reference wedge groove is the first wedge groove at one end of the multi-wedge pulley.

[0009] As an optional implementation, determining the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points of the reference wedge groove of each measured multi-wedge pulley and the reference plane includes: determining the coordinates of the center point of the polygon formed by the coordinates of multiple measured points of the reference wedge groove of each measured multi-wedge pulley; and determining the total coplanarity of the engine multi-wedge pulley based on the vertical distance between the center point coordinates and the reference plane.

[0010] As an optional implementation, determining the total surface area of ​​the engine multi-wedge pulley based on the vertical distance between the center point coordinates and the reference plane includes: determining whether the vertical distance between multiple center point coordinates and the reference plane is greater than 0; if the vertical distance between multiple center point coordinates and the reference plane is all greater than 0 or all less than 0, the total surface area of ​​the engine multi-wedge pulley is the absolute value of the distance between the reference plane and the farthest center point coordinate; if there is a center point coordinate with a vertical distance greater than 0 and there is a center point coordinate with a vertical distance less than 0, the total surface area of ​​the engine multi-wedge pulley is the difference between the maximum vertical distance and the minimum vertical distance.

[0011] As an optional implementation, determining the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points in the reference wedge groove of each measured multi-wedge pulley and the reference plane further includes: determining whether the vertical distance between the coordinates of multiple measured points of each multi-wedge pulley and the reference plane is greater than 0; if the vertical distance between the coordinates of multiple measured points of a multi-wedge pulley and the reference plane is all greater than 0 or all less than 0, then the single coplanarity of the multi-wedge pulley is the absolute value of the distance between the reference plane and the farthest measured point coordinate; if the coordinates of multiple measured points of a multi-wedge pulley have a vertical distance greater than 0 and a vertical distance less than 0 with the reference plane, then the single coplanarity of the multi-wedge pulley is the difference between the maximum vertical distance and the minimum vertical distance.

[0012] As an optional implementation, the number of measured point coordinates for each of the multi-wedge pulleys is greater than or equal to 3.

[0013] According to another aspect of the embodiments of this application, a measuring device for the coplanarity of multi-wedge pulleys is also provided, applied to the method for measuring the coplanarity of multi-wedge pulleys in an engine. The measuring device includes: a handheld coordinate measuring machine and a probe ball fixedly disposed at the end of the handheld coordinate measuring machine probe; the end of the handheld coordinate measuring machine probe is located at the center of the probe ball.

[0014] As an optional implementation, the handheld coordinate measuring machine includes a light pen coordinate measuring machine or an articulated arm coordinate measuring machine.

[0015] In this application embodiment, a method for measuring the coplanarity of multi-wedge pulleys in an engine is provided. This method is applied to a multi-wedge pulley coplanarity measuring device. Since the center surfaces of the conical wedge grooves of the same multi-wedge pulley have high precision, when measuring the coplanarity of the pulleys, only the distance tolerance value between the center surfaces of the same conical wedge grooves on all the pulleys being measured needs to be detected. The multi-wedge pulley coplanarity measuring device includes: a handheld coordinate measuring machine (CMM) and a probe ball fixedly mounted on the end of the CMM probe. When measuring the multi-wedge pulley: the probe ball at the front end of the handheld CMM probe is placed in the reference wedge groove of the reference multi-wedge pulley to obtain the reference point coordinates. The probe ball can be moved within the reference wedge groove to obtain multiple reference point coordinates. Due to the extremely high measurement accuracy of the handheld CMM, the accuracy of the obtained reference point coordinates is also high. A reference plane is then determined based on the multiple reference point coordinates. The handheld CMM then obtains the coordinates of multiple measured points in the reference wedge groove of each measured multi-wedge pulley using the same method. Finally, the coplanarity of the engine multi-wedge pulley is determined based on the coordinates of the multiple measured points in the reference wedge groove of each measured multi-wedge pulley and the reference plane. This measurement method completely eliminates the reliance of traditional measuring devices on the accuracy of the device's movement path. By using the precision of a handheld coordinate measuring machine and a probe ball, the coplanarity of multi-wedge pulleys can be accurately measured. This solves the problems of high measurement difficulty and low accuracy in existing technologies, and greatly improves the accuracy and convenience of multi-wedge pulley coplanarity measurement. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of a method for measuring the coplanarity of multi-wedge pulleys in an engine, provided according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of an optional wedge groove provided according to an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of an optional crankshaft pulley provided according to an embodiment of this application.

[0021] Figure 4This is a schematic diagram of an optional multi-ribbed pulley for an engine, provided according to an embodiment of this application.

[0022] Figure Labels 1 Crankshaft pulley, 2 First test pulley, 3 Second test pulley, 4 Wedge groove, 5 Probe ball, 6 Multi-wedge belt. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] Measuring the coplanarity of multi-ribbed pulleys requires all multi-ribbed pulleys to be installed on the engine on the assembly line before measurement can be performed. At this point, multiple parts have already been installed around the pulleys, resulting in a confined measurement space. Existing measuring devices rely heavily on the movement of the measuring device itself to measure the coplanarity, and the accuracy of the device's movement path significantly affects the accuracy of the measurement results. Due to the limited measurement space, relying on manual movement of the measuring device is less accurate, making it difficult to guarantee the accuracy of the measuring device. Therefore, existing technologies suffer from high measurement difficulty and low measurement accuracy.

[0026] like Figure 1-4 As shown, this application provides a method for measuring the coplanarity of multiple wedge pulleys in an engine. The engine includes multiple wedge pulleys, and a method for measuring the coplanarity of the multiple wedge pulleys is applied. The method for measuring the coplanarity of the multiple wedge pulleys includes a handheld coordinate measuring machine and a probe ball 5 fixedly disposed at the end of the handheld coordinate measuring machine probe, wherein the end of the handheld coordinate measuring machine probe is located at the center of the probe ball 5. The measurement method includes: S1 controls the handheld coordinate measuring machine to place the probe ball 5 in the reference wedge groove of the reference multi-wedge pulley, so that the probe ball 5 is tangent to the two sides of the reference wedge groove; S2 controls the handheld coordinate measuring machine to acquire the coordinates of multiple reference points; S3 determines the reference plane based on the coordinates of the multiple reference points; S4 controls the handheld coordinate measuring machine to place the probe ball 5 into the reference wedge groove of the other multi-wedge pulleys being tested, and to obtain the coordinates of multiple test points in the reference wedge groove of each multi-wedge pulley being tested. S5 determines the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points in the reference wedge groove of each measured multi-wedge pulley and the reference plane.

[0027] Specifically, firstly, the method for measuring the coplanarity of the multi-wedge pulleys of the engine is applied to a measuring device for the coplanarity of multi-wedge pulleys. The measuring device includes a handheld coordinate measuring machine and a probe ball 5 fixedly mounted on the end of the handheld coordinate measuring machine probe. The end of the handheld coordinate measuring machine probe is located at the center of the probe ball 5. Therefore, the coordinates measured by the handheld coordinate measuring machine are the position coordinates of the center of the probe ball 5.

[0028] Therefore, when measuring multi-ribbed pulleys: (e.g.) Figure 2-3 As shown, the probe ball 5 at the front end of the handheld coordinate measuring machine is placed in the reference wedge groove of the reference multi-wedge pulley, and the probe ball 5 is made tangent to the two sides of the reference wedge groove to obtain the coordinates of multiple reference points. To ensure that the coordinates of multiple reference points are all located on the center plane of the reference wedge groove when obtaining the coordinates of multiple reference points in the reference wedge groove, that is, as shown... Figure 2-3 During measurement, the probe ball 5 must be tangent to both sides of the reference wedge groove, as shown in the reference plane AA. Because the handheld coordinate measuring machine has extremely high measurement accuracy, the accuracy of the reference point coordinates obtained at this time is also high. Then, the reference plane AA is determined based on the coordinates of multiple reference points. Next, the handheld coordinate measuring machine is used to obtain the coordinates of multiple measured points of the reference wedge groove for each multi-wedge pulley using the same method, for example... Figure 4The crankshaft pulley 1, the first tested pulley 2, the second tested pulley 3, and the multi-ribbed belt 6 shown are used to obtain the coordinates of the measured points of the first tested pulley 2 and the second tested pulley 3 respectively using a handheld coordinate measuring machine in the same way. It is important to note that the reference wedge groove of each tested multi-ribbed pulley should be a wedge groove 4 at the same position as the reference wedge groove of the reference multi-ribbed pulley. For example, if the reference multi-ribbed pulley uses a wedge groove 4 in the middle position as the reference wedge groove, then the other tested multi-ribbed pulleys also use wedge grooves 4 in the same middle position as the reference wedge grooves. However, each measured point can be randomly selected within the reference wedge groove and does not need to be at the same position as the reference coordinates selected by the reference multi-ribbed pulley. Finally, the coplanarity of the engine multi-ribbed pulleys is determined based on the coordinates of multiple measured points of the reference wedge groove of each tested multi-ribbed pulley and the reference plane AA.

[0029] This measurement method completely eliminates the reliance of traditional measuring devices on the accuracy of the device's movement path. By using the precision of a handheld coordinate measuring machine and the probe ball 5, the coplanarity of multi-wedge pulleys can be accurately measured. This solves the problems of high measurement difficulty and low accuracy in existing technologies, and greatly improves the accuracy and convenience of multi-wedge pulley coplanarity measurement.

[0030] In addition, it should be noted that since the center surfaces of the conical wedge grooves 4 of the same multi-wedge pulley have high precision, when measuring the coplanarity of the pulleys, it is only necessary to check the distance tolerance value between the center surfaces of the same conical wedge grooves 4 on all the pulleys being measured; furthermore, when measuring the same engine, the coordinates of all points measured by the handheld coordinate measuring machine are based on the same absolute coordinate origin.

[0031] As an optional implementation, the diameter of the probe ball is less than or equal to the maximum width of the reference wedge groove.

[0032] Specifically, to further improve the measurement accuracy of the coplanarity of the multi-wedge pulley, the diameter of the probe ball 5 can be less than or equal to the maximum width of the reference wedge groove. Therefore, during the measurement process, the probe ball 5 can be placed into the wedge groove 4 and the probe ball 5 can be stuck in it, so that the probe ball 5 is stably fixed in the wedge groove 4, improving the accuracy of the reference coordinates, facilitating measurement, and thus improving the measurement accuracy of coplanarity.

[0033] As an optional implementation, both the reference point coordinates and the measured point coordinates are the coordinates of the center of the probe ball when the probe ball is tangent to the two sides of the reference wedge groove.

[0034] Specifically, since the center of the probe ball 5 is always located on the center plane of the wedge groove 4 during the measurement process, the coordinates of the center of the probe ball 5 can be directly used as the reference coordinates, and the basic plane, i.e., the center plane of the wedge groove 4, can be determined based on the coordinates of the center of the probe ball 5. However, it should be understood that this application does not limit this, and the coordinates of the bottom of the wedge groove 4 obtained by calculation can also be used as the reference coordinates, etc.

[0035] As an optional implementation method, such as Figure 4 As shown, the reference multi-wedge pulley is a crankshaft pulley 1; the reference wedge groove is the first wedge groove 4 at one end of the multi-wedge pulley.

[0036] Since the engine multi-wedge pulleys and other components are already assembled when measuring the coplanarity of the multi-wedge pulleys, and other parts are distributed around the multi-wedge pulleys, there may be inconvenience in operation. Therefore, the first wedge groove 4 at one end of the multi-wedge pulley can be selected as the reference wedge groove to facilitate the movement and measurement of the handheld coordinate measuring machine.

[0037] It should be understood that this application does not limit the selection of a specific reference wedge groove. Any wedge groove 4 at any position can be used as a reference wedge groove, and technicians can select one according to the actual situation.

[0038] As an optional implementation method, such as Figure 2-4 As shown, determining the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points of the reference wedge groove of each measured multi-wedge pulley and the reference plane AA includes: determining the coordinates of the center point of the polygon formed by the coordinates of multiple measured points of the reference wedge groove of each measured multi-wedge pulley; and determining the total coplanarity of the engine multi-wedge pulley based on the perpendicular distance between the center point coordinates and the reference plane AA.

[0039] As an optional implementation, determining the total surface area of ​​the engine multi-wedge pulley based on the vertical distance between the center point coordinates and the reference plane includes: determining whether the vertical distance between multiple center point coordinates and the reference plane is greater than 0; if the vertical distance between multiple center point coordinates and the reference plane is all greater than 0 or all less than 0, the total surface area of ​​the engine multi-wedge pulley is the absolute value of the distance between the reference plane and the farthest center point coordinate; if there is a center point coordinate with a vertical distance greater than 0 and there is a center point coordinate with a vertical distance less than 0, the total surface area of ​​the engine multi-wedge pulley is the difference between the maximum vertical distance and the minimum vertical distance.

[0040] Specifically, the spaces corresponding to the two sides of the reference plane can be designated as positive and negative, respectively. Then, in... Figure 4In the illustrated embodiment, if the vertical distances between the center point coordinates of the first tested pulley 2 and the second tested pulley 3 and the reference plane are both greater than 0 or both less than 0, the total surface area of ​​the engine multi-wedge pulley is the absolute value of the distance between the reference plane and the farthest center point coordinate; if the vertical distance between the center point coordinates of the first tested pulley 2 and the reference plane is greater than 0, and the vertical distance between the center point coordinates of the second tested pulley 3 and the reference plane is less than 0, then the total surface area of ​​the engine multi-wedge pulley is the difference between the center point coordinates of the first tested pulley 2 and the center point coordinates of the second tested pulley 3.

[0041] In addition, the absolute values ​​of the center point coordinates of the first tested pulley 2 and the second tested pulley 3 and the reference plane can be used as the coplanarity values ​​of the first tested pulley 2 and the second tested pulley 3 with the reference multi-wedge pulley, respectively.

[0042] As an optional implementation, determining the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points in the reference wedge groove of each measured multi-wedge pulley and the reference plane further includes: determining whether the vertical distance between the coordinates of multiple measured points of each multi-wedge pulley and the reference plane is greater than 0; if the vertical distance between the coordinates of multiple measured points of a multi-wedge pulley and the reference plane is all greater than 0 or all less than 0, then the single coplanarity of the multi-wedge pulley is the absolute value of the distance between the reference plane and the farthest measured point coordinate; if the coordinates of multiple measured points of a multi-wedge pulley have a vertical distance greater than 0 and a vertical distance less than 0 with the reference plane, then the single coplanarity of the multi-wedge pulley is the difference between the maximum vertical distance and the minimum vertical distance.

[0043] Specifically, similarly, when determining the coplanarity of each multi-wedge pulley, it can also be determined based on the coordinates of multiple measured points. For example, if the vertical distances between the coordinates of multiple measured points of the first measured pulley 2 and the second measured pulley 3 and the reference plane are all greater than 0 or all less than 0, then the coplanarity of the first measured pulley 2 and the second measured pulley 3 is the absolute value of the distance between the reference plane and the farthest measured point coordinate. If the coordinates of multiple measured points of the first measured pulley 2 or the second measured pulley 3 have a vertical distance greater than 0 and a vertical distance less than 0 from the reference plane, then the coplanarity of the multi-wedge pulley is the difference between the maximum vertical distance and the minimum vertical distance.

[0044] As an optional implementation, the number of measured point coordinates for each of the multi-wedge pulleys is greater than or equal to 3.

[0045] Specifically, to further refine the measurement results, more than three reference coordinates can be measured. When there are more than three points, the least squares weighted average variance method can be used to calculate the coordinates of the reference surface and the center point.

[0046] According to another aspect of the embodiments of this application, a measuring device for the coplanarity of multi-wedge pulleys is also provided, which is applied to the method for measuring the coplanarity of multi-wedge pulleys in an engine. The measuring device includes a handheld coordinate measuring machine and a probe ball fixedly disposed at the end of the handheld coordinate measuring machine probe.

[0047] As an optional implementation, the end of the handheld coordinate probe is located at the center of the probe sphere.

[0048] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0049] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more electronic devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0050] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0051] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0052] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the solution provided in this embodiment, depending on actual needs.

[0053] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0054] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0055] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for measuring the coplanarity of multi-wedge pulleys in an engine, wherein the engine includes multiple multi-wedge pulleys, characterized in that... A measuring device for the coplanarity of multi-wedge pulleys is provided. The measuring device includes a handheld coordinate measuring machine (CMM) and a probe ball fixedly mounted on the end of the CMM probe, the end of the handheld CMM probe being located at the center of the probe ball. The measuring method includes: The probe ball is positioned in the reference wedge groove of the reference multi-wedge pulley, such that the probe ball is tangent to the two sides of the reference wedge groove; Control the handheld coordinate measuring machine to acquire the coordinates of multiple reference points; The reference plane is determined based on the coordinates of the multiple reference points; The probe ball is controlled to be placed in the reference wedge groove of other multi-wedge pulleys under test, and the coordinates of multiple test points of the reference wedge groove of each multi-wedge pulley under test are obtained respectively; The coplanarity of the engine multi-wedge pulley is determined based on the coordinates of multiple measured points of the reference wedge groove of each measured multi-wedge pulley and the reference plane; the reference wedge groove of each measured multi-wedge pulley should be a wedge groove at the same position as the reference wedge groove of the reference multi-wedge pulley; the absolute values ​​of the coordinates of the center points of the first and second measured pulleys and the reference plane are respectively used as the coplanarity values ​​of the first and second measured pulleys with the reference multi-wedge pulley.

2. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 1, characterized in that, The diameter of the probe ball is less than or equal to the maximum width of the reference wedge groove.

3. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 1, characterized in that, The coordinates of the reference point and the coordinates of the measured point are both the coordinates of the center of the probe ball when the probe ball is tangent to the two sides of the reference wedge groove.

4. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 1, characterized in that, The reference multi-wedge pulley is a crankshaft pulley; the reference wedge groove is the first wedge groove at one end of the multi-wedge pulley.

5. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 1, characterized in that, The step of determining the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points in the reference wedge groove of each measured multi-wedge pulley and the reference plane includes: Determine the coordinates of the center point of the polygon formed by the coordinates of multiple measured points enclosed by the reference wedge groove of each measured multi-wedge pulley; The total surface area of ​​the engine multi-wedge pulley is determined based on the vertical distance between the center point coordinates and the reference plane.

6. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 5, characterized in that, Determining the total surface area of ​​the engine multi-wedge pulley based on the vertical distance between the center point coordinates and the reference plane includes: Determine whether the vertical distance between the coordinates of the multiple center points and the reference plane is greater than 0; If the perpendicular distances between the coordinates of multiple center points and the reference plane are all greater than 0 or all less than 0, the total surface area of ​​the engine multi-wedge pulley is the absolute value of the distance between the reference plane and the farthest center point coordinate. If there exists a vertical distance greater than 0 between the center point coordinates and the reference plane and a vertical distance less than 0 between the center point coordinates and the reference plane, the total surface area of ​​the engine multi-wedge pulley is the difference between the maximum vertical distance and the minimum vertical distance.

7. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 1, characterized in that, The step of determining the coplanarity of the engine multi-wedge pulley based on the coordinates of multiple measured points in the reference wedge groove of each measured multi-wedge pulley and the reference plane further includes: Determine whether the vertical distance between the coordinates of multiple measured points of each multi-wedge pulley and the reference plane is greater than 0; If the perpendicular distances between the coordinates of multiple measured points of a multi-wedge pulley and the reference plane are all greater than 0 or all less than 0, then the single coplanarity of the multi-wedge pulley is the absolute value of the distance between the reference plane and the coordinates of the farthest measured point. If the coordinates of multiple measured points of a multi-wedge pulley have a perpendicular distance greater than 0 from the reference plane and a perpendicular distance less than 0 from the reference plane, then the single coplanarity of the multi-wedge pulley is the difference between the maximum and minimum perpendicular distances.

8. The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in claim 1, characterized in that, The number of measured point coordinates for each of the multi-wedge pulleys is greater than or equal to 3.

9. A measuring device for the coplanarity of multi-wedge pulleys, characterized in that, The method for measuring the coplanarity of multi-wedge pulleys in an engine as described in any one of claims 1-8, wherein the measuring device comprises: a handheld coordinate measuring machine and a probe ball fixedly disposed at the end of the handheld coordinate measuring machine probe; the end of the handheld coordinate measuring machine probe is located at the center of the probe ball.

10. The measuring device for the coplanarity of multi-wedge pulleys as described in claim 9, characterized in that, The handheld coordinate measuring machine includes a light pen coordinate measuring machine or an articulated arm coordinate measuring machine.

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