Engine valve chamber cover detection device and detection method

Abstract

The application relates to an engine valve chamber cover detection device and a detection method, which comprises a detection tool, a bottom plate and a supporting column; the supporting column is fixed on the bottom plate; corresponding positioning surfaces are ground on the detection tool; the valve chamber cover is tightly combined with the positioning surfaces of the detection tool through the fastening bolts, and then is installed on the supporting column; the L-shaped measuring needle is arranged to scan the cross-section circle elements in the camshaft hole through the avoiding hole on the valve chamber cover; the scanned elements are processed by removing the maximum point and the minimum point to form a circle; the circles of the first and last camshaft holes are connected to form a common axis as a reference; the coaxialities of the second, third and fourth camshaft holes are evaluated in sequence; if the measurement result is within the tolerance range of + / -0.04, the product is qualified; otherwise, the product is unqualified; the qualified products and unqualified products of each batch are identified in sequence by measurement; the application can not only simulate the state of the valve chamber cover on the engine, but also can efficiently and quickly complete the detection task of the two rows of camshaft holes of the valve chamber cover.

Description

Technical Field

[0001] This invention belongs to the technical field of testing devices, and relates to a testing device and method for engine valve cover. Background Technology

[0002] The valve cover of an engine is mainly connected to the cylinder head. The camshaft is installed below the valve cover to ensure the normal operation and lubrication of the engine's valve drive mechanism and to protect the engine. Therefore, we must strictly control quality to ensure the valve cover meets standards. During the testing process, it is essential to simulate the actual assembly state of the valve cover.

[0003] During batch sampling inspection, it was found that each batch of valve cover had varying degrees of deformation, resulting in varying degrees of deformation on the plane connecting the valve cover and the cylinder head. This caused some difficulties in measurement and increased the difficulty of judgment, making it impossible to accurately determine whether the measured flatness deviation reflected the true condition of the parts. Using this invention can avoid the deviation caused by deformation, and at the same time improve the accuracy and efficiency of the inspection.

[0004] Patent document CN205279915U discloses an engine hood inspection tool in the field of automotive parts, including a base, fixing seats, clamps, and inspection blocks. The upper end of the base has an irregularly shaped annular inspection platform with a contour identical to the circumference of the engine hood. The inner side of the top of the inspection platform protrudes upward to form an annular boss. There are four fixing seats, all fixed to the base outside the inspection platform with screws. The clamps are fixed to the top of the fixing seats. The inner side of the inspection platform has a first positioning post and a second positioning post. The base also has four rectangular positioning platforms located on the left and right sides, rear side, and left rear side of the first positioning post, respectively. Each positioning platform has a cylindrical positioning pin at its top. The four fixing seats are located on the left and right sides of the first positioning post, the rear side of the second positioning post, and the left rear side of the first positioning post, respectively. This patent document describes an edge-wrapping inspection device and has low relevance to this invention.

[0005] Patent document CN208547318U discloses an engine hood inspection tool, which solves the problem of difficulty in ensuring the inspection accuracy of the mounting slot. It includes a base plate and a go gauge. The base plate is provided with a fixing bracket for mounting and fixing the engine hood. A first detection block is provided on a first base, and a first test gap is formed between the first detection block and the mounting slot for the go gauge to inspect. A sliding device is provided on the first base, and the first detection block is slidably connected to the first base through the sliding device. A positioning device is provided on the base plate for positioning the first detection block. This patent document describes an inspection tool used in a coordinate measuring machine (CMM) process, which differs from this invention; it can only confirm the shape, while the device in this application can assist in determining whether it is qualified.

[0006] Patent document CN209589026U discloses a flatness testing device for timing cover production, including a support base, a first slide rail, a first electric slider, and an electric cylinder. Two first slide rails are fixed above the support base. The first electric slider is mounted above the first slide rail, and the electric cylinder is fixed above the first electric slider. A telescopic rod is provided above the electric cylinder, and a fixing block is fixed above the telescopic rod. A second slide rail is installed between the two fixing blocks, and a second electric slider is mounted on the second slide rail. By setting up a controller and a distance sensor, the machine replaces manual labor for the testing work. This patent document describes a device for flatness testing in production and has low relevance to this application. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art, and to provide an engine valve cover detection device and detection method. The present invention can not only simulate the state of the valve cover on the engine, but also efficiently and quickly complete the detection task of the two rows of camshaft shaft holes of the valve cover.

[0008] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0009] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0010] An engine valve cover testing device includes a fixture, a base plate 1, and a support column 2.

[0011] Support column 2 is fixed on base plate 1;

[0012] The valve cover 8 is tightly fitted to the positioning surface 7 of the gauge by tightening bolts 9, and then installed on the support column 2.

[0013] Furthermore, clearance holes 4 corresponding to the valve cover are made on the fixture, and corresponding reinforcing ribs 5 are added on both sides of the clearance holes 4 to improve the strength of the fixture itself; corresponding tightening bolt holes 6 are made on the fixture, and corresponding positioning surfaces 7 are ground on the fixture.

[0014] Furthermore, the support column 2 is provided with a positioning groove 3.

[0015] Furthermore, the positioning groove 3 is configured as an L-shape.

[0016] Furthermore, the support column 2 is fixed to the base plate 1 by a threaded connection.

[0017] Furthermore, four support columns 2 are evenly distributed on the base plate.

[0018] A method for detecting engine valve cover, characterized in that:

[0019] The configured L-shaped probe is used to scan the cross-sectional circular elements inside the camshaft hole through the clearance hole 4 on the valve cover 8. The scanned elements are processed by removing the maximum and minimum points to construct a circle. The circles of the first and last camshaft holes are connected to form a common axis as a reference. The coaxiality of the second, third and fourth camshaft holes is evaluated in turn. If the measurement result is within the tolerance zone of ±0.04, it is qualified; otherwise, it is unqualified.

[0020] Furthermore, before performing element scanning of the camshaft bore through the clearance hole 4 on the valve cover 8, the following preparations are made:

[0021] Place the base plate 1 on the coordinate measuring platform, fix the support column 2 to the base plate 1 by threaded connection, and adjust the positioning groove 3 to the theoretically correct position for use.

[0022] Furthermore, a method for inspecting an engine valve cover also includes:

[0023] Place the valve cover 8 on the positioning surface 7 of the fixture, align the positioning hole of the valve cover 8 with the tightening bolt hole 6 of the fixture, pass the tightening bolt 9 through the tightening bolt hole 6 and the valve cover 8, and tightly fit the mounting surface of the valve cover 8 with the positioning surface 7 of the fixture. At the same time, increase the torque to the design required torque to simulate the state of the valve cover 8 installed on the cylinder head for use.

[0024] Furthermore, the connected gauge and valve cover 8 are installed together in the adjusted positioning groove 3.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention can not only simulate the state of the valve cover on the engine, but also efficiently and quickly complete the inspection task of the two rows of camshaft bores of the valve cover.

[0027] This invention can avoid deviations caused by deformation, while improving the accuracy and efficiency of detection. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the installation of the testing device;

[0030] Figure 2 Schematic diagram for avoiding holes and reinforcing ribs;

[0031] Figure 3 This is an illustration of the positioning surface and the tightening bolt holes;

[0032] Figure 4a Indication of tightening the inspection tool for the cover Figure 1 ;

[0033] Figure 4b Indication of tightening the inspection tool for the cover Figure 2 ;

[0034] Figure 5 This is a schematic diagram of the part to be tested;

[0035] Figure 6 This is a schematic diagram of the detection process;

[0036] In the picture:

[0037] 1-Base plate;

[0038] 2-Supporting column;

[0039] 3-Positioning groove;

[0040] 4-Avoidance hole;

[0041] 5-Reinforcing ribs;

[0042] 6- Tighten the bolt holes;

[0043] 7-Location surface;

[0044] 8-Valve chamber cover;

[0045] 9. Tighten the bolts. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0047] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0048] The present invention will now be described in detail with reference to the accompanying drawings:

[0049] This invention provides an engine valve cover testing device and testing method.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4a , Figure 4b , Figure 5 As shown: The detection device consists of the following components: base plate 1; support column 2; positioning groove 3; clearance hole 4; reinforcing rib 5; tightening bolt hole 6; positioning surface 7; valve chamber cover 8; tightening bolt 9;

[0051] The connection relationships of the detection devices are as follows:

[0052] First, fix the support column 2 to the base plate 1 using threaded connections;

[0053] An L-shaped positioning groove 3 is cut into the support column 2;

[0054] Make corresponding clearance holes 4 on the fixture, and add corresponding reinforcing ribs 5 on both sides of the clearance holes 4 to improve the strength of the fixture itself; finally, make corresponding tightening bolt holes 6 on the fixture and grind corresponding positioning surfaces 7 on the fixture.

[0055] See Figure 6 The testing steps are as follows:

[0056] The first step is to install the detection device;

[0057] The second step is to install the valve cover assembly;

[0058] The third step is to install the inspection fixture;

[0059] The fourth step is to check the size of the valve cover.

[0060] Detection method steps:

[0061] The first step is to place the base plate 1 on the coordinate measuring platform and then fix the support column 2 on the base plate 1 by threaded connection. At the same time, adjust the positioning groove 3 to the correct theoretical position for use.

[0062] The second step is to place the valve cover 8 on the positioning surface 7 of the fixture and align the positioning hole of the valve cover 8 with the tightening bolt hole 6 of the fixture. Then, pass the tightening bolt 9 through the tightening bolt hole 6 and the valve cover 8 to make the mounting surface of the valve cover 8 fit tightly against the positioning surface 7 of the fixture. At the same time, increase the torque to the design torque to simulate the state of the valve cover 8 installed on the cylinder head for use.

[0063] The third step is to install the connected gauge and valve chamber cover 8 together in the adjusted positioning groove 3 for use;

[0064] The fourth step involves installing the connected gauge and valve cover 8 together in the adjusted positioning groove 3, and then placing the base plate 1 on the coordinate measuring platform. At this time, the state of the valve cover 8 is consistent with the state of the valve cover 8 installed on the cylinder head. Measurement is then performed. The configured L-shaped probe is used to scan the elements of the camshaft hole (the cross-sectional circle inside the camshaft hole) through the clearance hole 4 on the valve cover 8. Finally, the scanned elements (the circle formed by the 3600 points actually collected) are processed by software (one calculation method is the least squares method: which can be roughly understood as removing the maximum and minimum points, this is the existing technology) to construct a circle. Then, the circles of the first and last camshaft holes are connected to form a common axis as a reference. The coaxiality of the second, third and fourth camshaft holes is evaluated in turn. If the measurement result is within the tolerance range of ±0.04, it is qualified; otherwise, it is unqualified. The number of qualified and unqualified products in each batch is identified by sequential measurement.

[0065] The present invention provides a space avoidance structure that matches the shape of the sample being tested and a reinforcing rib structure to prevent deformation.

[0066] The present invention provides a support and positioning structure for the measurement sample;

[0067] This measurement process not only improves efficiency and minimizes the number of repeated measurements, but also makes the results more accurate and convincing, significantly improving testing efficiency and providing strong support for batch sampling inspection.

[0068] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be included within the scope of protection of the present invention. Furthermore, all content not described in detail in this specification is prior art known to those skilled in the art.

Claims

1. A method for detecting engine valve cover, characterized in that: Before performing element scanning of the camshaft bore through the clearance holes on the valve cover, the following preparations should be made: Place the base plate on the coordinate measuring platform, fix the support column to the base plate with threaded connection, and adjust the positioning groove to the theoretically correct position for use; Place the valve cover on the positioning surface of the fixture, align the positioning hole of the valve cover with the tightening bolt hole of the fixture, pass the tightening bolt through the tightening bolt hole and the valve cover, and tightly fit the mounting surface of the valve cover with the positioning surface of the fixture. At the same time, increase the torque to the design required torque to simulate the state of the valve cover installed on the cylinder head for use. Install the connected gauge and valve cover together into the adjusted positioning groove; The configured L-shaped probe is used to scan the cross-sectional circular elements inside the camshaft bore through the clearance hole on the valve cover. The scanned elements are fitted into a circle using the least squares method. The circles of the first and last camshaft bores are connected to form a common axis as a reference. The coaxiality of the second, third and fourth camshaft bores is evaluated in turn. If the measurement result is within the tolerance zone of ±0.04, it is considered qualified; otherwise, it is considered unqualified.

2. An engine valve cover detection device, used in the detection method as described in claim 1, characterized in that: Includes inspection fixtures, base plate, and support columns; The support columns are fixed to the base plate; The valve cover is installed on the support column by tightly fitting it to the positioning surface of the gauge with tightening bolts; A clearance hole corresponding to the valve cover is made on the fixture, and corresponding reinforcing ribs are added on both sides of the clearance hole to improve the strength of the fixture itself; corresponding tightening bolt holes are made on the fixture, and corresponding positioning surfaces are ground on the fixture.

3. The engine valve cover detection device according to claim 2, characterized in that: The support column is provided with a positioning groove.

4. The engine valve cover detection device according to claim 3, characterized in that: The positioning groove is L-shaped.

5. The engine valve cover detection device according to claim 4, characterized in that: The support column is fixed to the base plate by a threaded connection.

6. The engine valve cover detection device according to claim 5, characterized in that: The support columns are evenly distributed on the base plate, and four columns are provided.

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