A method for detecting and calibrating installation of a double injector pressure plate

Abstract

The application provides a double-injector pressing plate installation detection calibration method, which is used for satisfying the double-injector pressing plate pressing installation of two adjacent cylinder injectors of a high-pressure common rail engine cylinder head. The application has the following beneficial effects: the double-injector pressing plate is pre-pressed and plastically deformed on a tool, so that the four corners of the double pressing plate are coplanar, then the injectors are installed on the engine cylinder head, the adjacent cylinder injectors are simultaneously and evenly pressed on the cylinder head through pressing bolts and spherical adjusting washers, and the problem of tightly pressing and installing the bottom of the injector and the injector hole seat of the cylinder head is effectively solved. The application fully utilizes the double-injector pressing plate pre-pressing process, solves the problem that the casting process of the four corners of the double-injector pressing plate is difficult to realize, realizes the tight pressing and sealing of the adjacent cylinder injectors by using a simple, easy-to-implement and low-cost method, is beneficial to realizing the batch production of the engine, and can be widely applied to the injector installation under various narrow installation working conditions of diesel engines, gasoline engines and the like.

Description

Technical Field

[0001] This invention belongs to the field of engine assembly and testing technology, and in particular relates to a method for testing and calibrating the installation of dual injector pressure plates. Background Technology

[0002] With the continuous improvement of industrialization, power units are developing towards lightweight and miniaturization, and the restrictions on engine weight and volume are becoming increasingly stringent. Compact integrated design is being widely used in engine component design. At the same time, engine manufacturing and assembly face many process testing problems.

[0003] In the currently developed engines, under the condition of compact integrated design of engine cylinder head, the pressure installation and testing of injector is difficult. Whether the injector is effectively pressure installed directly affects the working performance of the injector. Improper installation can lead to failures such as air leakage at the contact point between the injector and the cylinder head and needle valve sticking. Summary of the Invention

[0004] In view of this, the present invention aims to propose a method for testing and calibrating the installation of dual injector pressure plates, so as to meet the requirements of pressing and installing dual injector pressure plates for adjacent two cylinder injectors in the cylinder head of a high-pressure common rail engine.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A method for testing and calibrating the installation of dual injector pressure plates, implemented by a dual injector pressure plate installation testing and calibration device, includes the following calibration methods:

[0007] Based on the dual injector pressure plate installation test and calibration device, the load is transferred to the four circumferential corners of the dual injector pressure plate after plastic deformation by the press through the tooling clamping head and spherical adjusting washer. The torque is applied by the clamping bolt and the load is evenly applied to the two adjacent injectors of the cylinder head by the plastic deformation dual injector pressure plate, so as to achieve the clamping and reliable sealing between the injector and the cylinder head.

[0008] The press gradually applies a set of preloads P+1000 N, P+2000 N, ..., P+1000*n N, until the pressure plate of the dual injectors undergoes local plastic deformation and the four corners are coplanar.

[0009] Furthermore, the load P is the bolt preload corresponding to the design torque T0.

[0010] Furthermore, the dual injector pressure plate installation testing and calibration device includes a dual injector pressure plate, injectors, a tooling clamping head, clamping bolts, and a cylinder head. The dual injector pressure plate is installed on the cylinder head, and the left and right sides of the dual injector pressure plate are respectively connected to the injectors. The tooling clamping head is used to pre-compress and plastically deform the dual injector pressure plate, and the clamping bolts are used to position the injectors on both sides of the dual injector pressure plate.

[0011] Furthermore, the dual injector pressure plate installation detection and calibration device also includes a spherical adjusting washer, which is installed above the dual injector pressure plate and is used to cooperate with the tooling clamping head or clamping bolt.

[0012] Furthermore, the dual injector pressure plate is first pre-compressed and plastically deformed on the tooling clamping head to achieve coplanarity at the four corners of the dual pressure plate, and then the injectors are installed: the injectors of the two adjacent cylinders are fixed to the cylinder head by tightening bolts and spherical adjusting washers using the dual injector pressure plate.

[0013] Furthermore, the dual injector pressure plate is a structural component for adjacent injectors on the cylinder head. The injector on the left is pressed by points a and b on the dual injector pressure plate, and the injector on the right is pressed by points c and d on the dual injector pressure plate.

[0014] Furthermore, the tooling clamping head serves as a pressure transmission structure for the press, applying the load to the dual injector pressure plate through the press.

[0015] Furthermore, the spherical adjusting washer has a hemispherical structure, with the upper plane contacting the tooling clamping head and the lower spherical structure contacting the conical hole in the middle of the dual injector pressure plate.

[0016] Furthermore, the cylinder head provides a support carrier for the press-fitting installation of the injector during the test, and the injector provides a press-fitting installation object during the test.

[0017] Compared with existing technologies, the dual injector pressure plate installation, testing, and calibration method of the present invention has the following advantages:

[0018] This invention discloses a method for installing, testing, and calibrating dual injector pressure plates. The method involves pre-pressing the dual injector pressure plates onto a tooling fixture to achieve coplanarity at all four corners. Then, the injectors are installed on the engine cylinder head, and adjacent cylinder injectors are simultaneously and evenly pressed onto the cylinder head using clamping bolts and spherical adjusting washers. This effectively solves the problem of achieving a tight seal between the injector bottom and the cylinder head injector hole seat. This invention fully utilizes the pre-pressing process of the dual injector pressure plates, overcoming the difficulty of achieving coplanarity at all four corners of the pressure plates during casting. It uses a simple, easy, and low-cost method to achieve a compact and sealed seal between adjacent cylinder injectors, which is beneficial for mass production of engines. Furthermore, it can be widely applied to injector installation under confined working conditions in various diesel and gasoline engines. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the pre-pressed plastic deformation structure of the dual injector pressure plate according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram illustrating the principle of pressing and installing adjacent two-cylinder injectors according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Dual injector pressure plate; 2. Tooling clamping head; 3. Spherical adjusting washer; 4. Cylinder head; 5. Injector; 6. Clamping bolt. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 2As shown, a method for testing and calibrating the installation of dual injector pressure plates is implemented by a dual injector pressure plate installation testing and calibration device. This device consists of six parts: dual injector pressure plates 1, injectors 5, tooling clamping heads 2, clamping bolts 6, spherical adjusting washers 3, and cylinder heads 4. The dual injector pressure plates 1 are first pre-compressed and plastically deformed on the tooling to achieve coplanarity at the four corners of the dual pressure plates. Then, the injectors 5 are installed: the two adjacent injectors 5 of the two cylinders are tightened and fixed to the cylinder head 4 using the dual injector pressure plates 1, clamping bolts 6, and spherical adjusting washers 3.

[0029] like Figure 1 As shown, the dual injector pressure plate 1 is a structural component for adjacent injectors 5 on the cylinder head 4. The left injector 5 is clamped at points a and b, and the right injector 5 is clamped at points c and d. The tooling clamping head 2 serves as a force transmission structure for the press, applying the load to the dual injector pressure plate 1 through the press. The spherical adjusting washer 3 has a hemispherical structure; its upper plane contacts the tooling clamping head 2, and its lower spherical structure contacts the conical hole in the middle of the dual injector pressure plate 1.

[0030] like Figure 2 As shown, the cylinder head 4 provides a support carrier for the press-fitting of the injectors 5 during the test. The injectors 5 provide the press-fitting objects during the test. The clamping bolts 6 apply load through torsional torque to press the injectors 5 onto the cylinder head 4. The spherical adjusting washers 3 are self-aligning structural components used to coordinate the preload of the clamping bolts 6 with the direction of the support force of the plastic-deformed dual injector pressure plate 1. The plastic-deformed dual injector pressure plate 1 is a plastic-deformed structural component on the cylinder head 4 for adjacent injectors 5.

[0031] Calibration methods include:

[0032] The load is transferred to the four coplanar circumferential angles a, b, c, and d after plastic deformation by the press through the tooling clamping head 2 and the spherical adjusting washer 3. The clamping bolt 6 applies torque and the load is evenly applied to the two injectors 5 of the adjacent cylinder of the cylinder head 4 by the plastic deformation dual injector clamping plate 8, so as to achieve the clamping and reliable sealing between the injector 5 and the cylinder head 4.

[0033] The press gradually applies a set of preloads P+1000 N, P+2000 N, ..., P+1000*n N, where load P is the bolt preload corresponding to the design torque T0, until the local plastic deformation of the dual injector pressure plate 1 results in four coplanar circumferential angles a, b, c, and d.

[0034] This invention utilizes a pre-pressing process on a tooling fixture to achieve coplanarity at all four corners of the dual injector pressure plates. The injectors are then installed on the engine cylinder head, and adjacent cylinder injectors are simultaneously and evenly pressed onto the cylinder head using clamping bolts and spherical adjusting washers. This effectively solves the problem of tightly pressing the injector bottom against the cylinder head injector hole seat. This invention fully utilizes the pre-pressing process of the dual injector pressure plates, overcoming the difficulty of achieving coplanarity at all four corners of the pressure plates during casting. It employs a simple, easy, and low-cost method to achieve compact, sealed pressing of adjacent cylinder injectors, which is beneficial for mass production of engines. Furthermore, it can be widely applied to injector installation under confined working conditions in various diesel and gasoline engines.

[0035] Example 1

[0036] First, according to Figure 1 As shown, a set of preloads P, P+1000 N, ..., P+1000*n N are gradually applied using a press. The clamping head is then tightened using a tooling fixture.

[0037] The spherical adjusting washer 3 transfers the load to the dual injector pressure plate 1. After the dual injector pressure plate 1 is plastically deformed, the four circumferential angles a, b, c, and d are coplanar. This can be checked using a feeler gauge or other methods. The flatness is required to be less than 0.02 mm.

[0038] Then press Figure 2 As shown, the clamping bolt 6 applies the designed torque T0. After the ball adjusting washer 7 is aligned, the load is evenly applied to the two injectors 5 of the adjacent cylinder of the cylinder head 4 by the plastic deformation dual injector pressure plate 8, so as to achieve the clamping and reliable sealing between the injector 5 and the cylinder head 4.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for installing, testing, and calibrating dual injector pressure plates, characterized in that: The calibration is achieved by mounting a testing and calibration device on a dual injector pressure plate, and the calibration methods include: Based on the dual injector pressure plate installation test and calibration device, the load is transferred to the four circumferential corners of the dual injector pressure plate after plastic deformation by the press through the tooling clamping head and spherical adjusting washer. The torque is applied by the clamping bolt and the load is evenly applied to the two adjacent injectors of the cylinder head by the plastic deformation dual injector pressure plate, so as to achieve the clamping and reliable sealing between the injector and the cylinder head. The press gradually applies a set of preloads P+1000 N, P+2000 N, ..., P+1000*n N, until the pressure plate of the dual injectors undergoes local plastic deformation and the four corners are coplanar; The dual injector pressure plate installation testing and calibration device includes a dual injector pressure plate, injectors, a tooling clamping head, clamping bolts, and a cylinder head. The dual injector pressure plate is installed on the cylinder head. The left and right sides of the dual injector pressure plate are connected to the injectors respectively. The tooling clamping head is used to pre-compress and plastically deform the dual injector pressure plate. The clamping bolts are used to position the injectors on both sides of the dual injector pressure plate. The dual injector pressure plate is first pre-compressed and plastically deformed on the tooling clamping head to achieve coplanarity at the four corners of the dual pressure plate, and then the injectors are installed: the injectors of the two adjacent cylinders are fixed to the cylinder head by tightening bolts and spherical adjusting washers using the dual injector pressure plate.

2. The method for installing, testing, and calibrating a dual injector pressure plate according to claim 1, characterized in that: The load P is the bolt preload corresponding to the design torque T0.

3. The method for installing, testing, and calibrating a dual injector pressure plate according to claim 1, characterized in that: The dual injector pressure plate installation detection and calibration device also includes a spherical adjusting washer, which is installed above the dual injector pressure plate and is used to cooperate with the tooling clamping head or clamping bolt.

4. The method for installing, testing, and calibrating a dual injector pressure plate according to claim 1, characterized in that: The dual injector pressure plate is a structural component for adjacent injectors on the cylinder head. The injector on the left is pressed by points a and b on the dual injector pressure plate, and the injector on the right is pressed by points c and d on the dual injector pressure plate.

5. The method for installing, testing, and calibrating a dual injector pressure plate according to claim 1, characterized in that: The tooling clamping head serves as a pressure transmission structure for the press, applying the load to the dual injector pressure plate through the press.

6. The method for installing, testing, and calibrating a dual injector pressure plate according to claim 1, characterized in that: The spherical adjusting washer has a hemispherical structure, with its upper plane contacting the tooling clamping head and its lower spherical structure contacting the conical hole in the middle of the dual injector pressure plate.

7. The method for installing, testing, and calibrating a dual injector pressure plate according to claim 1, characterized in that: The cylinder head provides a support carrier for the pressurized installation of the injector during the test, and the injector provides a pressurized installation object during the test.

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