An engine cylinder head repair device and system

Abstract

This utility model discloses an engine cylinder head repair device and system. The cylinder head includes valve seat holes. The device comprises a bracket, a drilling structure, and a positioning structure. The bracket is mounted on the end face of the cylinder head, and the drilling structure is slidably connected to the bracket. The positioning structure includes a through hole. When the positioning structure is inserted into the valve seat hole, the coaxiality between the through hole and the valve seat hole is A, where A satisfies: 0 ≤ A ≤ 0.06 mm. The coaxiality between the drilling structure and the through hole is B, where B satisfies: 0 ≤ B ≤ 0.04 mm. Using the engine cylinder head repair device provided by this utility model, the new valve guide hole and the valve seat hole can meet the coaxiality requirements. The new valve guide hole is used to install the valve guide, so that the newly installed valve guide and the valve form a new friction pair. This effectively reduces repair costs after excessive wear of the valve guide hole in a non-independent valve guide cylinder head.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to an engine cylinder head repair device and system. Background Technology

[0002] Engine cylinder heads are generally divided into engine cylinder heads with independent valve guides and engine cylinder heads with non-independent valve guides. Among them, the valve guide is the guiding device for the valves of the automobile engine. The valve guide plays a guiding role for the valves and transfers the heat on the valve stem to the cylinder head through the valve guide.

[0003] For engine cylinder heads with independent valve guides, valve guide holes are provided on the cylinder head for installing valve guides. For engine cylinder heads without independent valve guides, only valve guide holes and valves are included, and valve guides are not installed within the valve guide holes. During engine operation, the valve guide holes and valves experience continuous friction. When the valve guide holes wear to a certain extent, problems such as insufficient engine power, increased oil consumption, abnormal engine noise, and even cylinder scoring may occur. Currently, for engine cylinder heads with excessively worn valve guide holes, the usual repair method is to replace the entire engine cylinder head assembly, which results in extremely high repair costs.

[0004] Therefore, how to reduce maintenance costs after the engine cylinder head experiences excessive wear of valve guide holes has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This invention provides an engine cylinder head repair device and system to reduce repair costs after the engine cylinder head experiences excessive wear of the valve guide holes.

[0006] In a first aspect, this utility model provides an engine cylinder head repair device. The cylinder head includes a valve seat hole. The device includes a bracket, a drilling structure, and a positioning structure. The bracket is used to install on the end face of the cylinder head. The drilling structure is slidably connected to the bracket. The positioning structure includes a through hole. When the positioning structure is inserted into the valve seat hole, the coaxiality between the through hole and the valve seat hole is A, and A satisfies: 0mm≤A≤0.06mm. When the positioning structure is inserted into the valve seat hole, and a portion of the drilling structure is inserted into the through hole along the axial direction of the drilling structure, the coaxiality between the drilling structure and the through hole is B, and B satisfies: 0mm≤B≤0.04mm.

[0007] The engine cylinder head repair device provided by this utility model, through the setting of a positioning structure, and during the process of enlarging the valve guide hole, firstly, when the positioning structure is inserted into the valve seat hole, and along the axial direction of the drilling structure, when part of the drilling structure is inserted into the through hole, since the coaxiality of the through hole and the valve seat hole is A, and A satisfies: 0mm≤A≤0.06mm, and the coaxiality of the drilling structure and the through hole is B, and B satisfies: 0mm≤B≤0.04mm, the coaxiality of the drilling structure and the valve seat hole can be limited within the required range. This allows for the machining of a new valve guide hole that meets the coaxiality requirements. The machined new valve guide hole is then used to install the valve guide, so that the newly installed valve guide and valve form a new friction pair. This avoids directly replacing the entire engine cylinder head assembly after excessive wear of the valve guide hole in an engine cylinder head with non-independent valve guides, thereby effectively reducing maintenance costs.

[0008] In one possible implementation of this utility model, the drilling structure includes an installation station, a guide post, and a drill bit. The installation station is slidably connected to a bracket. When the guide post is installed at the installation station, the drill bit is separated from the installation station. When the drill bit is installed at the installation station, the guide post is separated from the installation station. When the guide post is installed at the installation station, the positioning structure is used for insertion into the valve seat hole, and when the guide post is inserted into the through hole, the installation station and the through hole are positioned opposite each other along the axial direction of the guide post. When the installation station and the through hole are positioned opposite each other, the installation station is used to install the guide post or the drill bit. This satisfies the coaxiality requirement between the new valve guide hole and the valve seat hole while improving the ease of equipment maintenance and reducing maintenance costs. Furthermore, the dimensions of the guide post and the drill bit can be quickly changed according to actual processing needs to improve the versatility of the device.

[0009] In one possible implementation of this utility model, when the guide post is installed at the installation position, the positioning structure is used to insert into the valve seat hole, and the guide post is inserted into the through hole, the gap between the side wall of the guide post and the wall of the through hole is f, and 0mm≤f≤0.01mm. During the insertion of the guide post and the through hole of the positioning structure, since the gap between the side wall of the guide post and the wall of the through hole is infinitely close to 0, their axes almost coincide, thereby improving the ease of installation of the guide post while meeting the coaxiality requirements of the guide post and the through hole.

[0010] In one possible implementation of this invention, the drilling structure includes a guide post and a drill bit. The guide post is connected to the drill bit along its axial direction, and the guide post and drill bit are coaxial. When the positioning structure is used to insert into the valve seat hole, and the guide post is inserted into the through hole, the coaxiality between the drill bit and the through hole is B. This reduces the risk of reduced coaxiality between the drill bit and the through hole due to deviations in the clamping force at the installation position during the replacement of the guide post and drill bit.

[0011] In one possible implementation of this utility model, the positioning structure further includes a body, with a through hole penetrating the body and coaxial with the outer side wall of the body. The body is used for insertion into the valve seat hole, and the gap between the outer side wall of the body and the hole wall of the valve seat hole is n, where 0 ≤ n ≤ 0.025 mm. During the insertion process of the positioning structure into the valve seat hole, since the gap between the side wall of the positioning structure and the hole wall of the valve seat hole is infinitely close to 0, their axes almost coincide. This satisfies the coaxiality requirement between the positioning structure and the valve seat hole while improving the ease of installation and simplifying the positioning structure.

[0012] In one possible implementation of this utility model, a groove is provided on the end face of the main body. The groove includes a first sidewall, a second sidewall, and an open end. The included angle between the extension surfaces of the first and second sidewalls is an acute angle, and the first and second sidewalls are tangent to the wall of the through hole, respectively. The open end is positioned opposite the included angle. This facilitates the positioning between the guide post and the through hole, thereby improving the ease of processing and the processing accuracy of the device.

[0013] In one possible implementation of this utility model, the body includes a first abutting part, a second abutting part, and a third abutting part. These three abutting parts are stacked along the axial direction of the through hole. The end face of the first abutting part is connected to the end face of the third abutting part through the second abutting part. The diameter of the first abutting part is D1, the diameter of the second abutting part is D2, and the diameter of the third abutting part is D3, where D3 < D2 < D1. This design improves the versatility of the positioning structure while ensuring a stable connection between the positioning structure and the valve seat bore.

[0014] In one possible implementation of this invention, the sidewall of the first abutment portion includes a first cut surface and a second cut surface, which are spaced apart and connected by an arc surface. The user can simultaneously grasp the first and second cut surfaces to achieve rapid movement of the positioning structure, which improves the ease of operation of the positioning structure.

[0015] In one possible implementation of this utility model, the bracket includes a mounting base and an electromagnetic structure. The electromagnetic structure is disposed on the mounting base, which is used to abut against the end face of the cylinder head. The electromagnetic structure has an energized state and an de-energized state. When the electromagnetic structure is energized, the mounting base and the end face of the cylinder head are magnetically attracted. During the machining of the valve guide hole, the axial machining position of the drill bit is kept consistent with the machining position of the valve guide hole. This is used to control the coaxiality and runout range of the machined valve guide hole and valve seat hole, thereby improving the maintenance reliability of the cylinder head.

[0016] Secondly, this utility model provides an engine cylinder head repair system, including valve guides and an engine cylinder head repair device as described in the first aspect, wherein the engine cylinder head repair device is used to process valve guide holes, and the valve guides are inserted into the valve guide holes. Attached Figure Description

[0017] Figure 1 A schematic diagram of an engine cylinder head repair device provided by this utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the positioning structure of the provided engine cylinder head repair device;

[0019] Figure 3 for Figure 2 A cross-sectional view along the radial direction.

[0020] Reference numerals: 01-Valve seat hole; 02-Valve guide hole; 03-End face; 1-Bracket; 2-Drilling structure; 21-Mounting part; 22-Guide post; 3-Positioning structure; 31-Through hole; 32-Body; 321-First abutment part; 322-Second abutment part; 323-Third abutment part; 324-First cut surface; 325-Second cut surface; 33-Groove; 331-First sidewall; 332-Second sidewall; 4-Fixing cover; 5-Servo motor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this utility model are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the protection scope of this utility model. The accompanying drawings of the embodiments of this utility model are only for illustrating relative positional relationships and do not represent actual proportions.

[0022] It should be noted that specific details are set forth in the following description to facilitate understanding of this utility model. However, this utility model can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] Engine cylinder heads are generally divided into engine cylinder heads with independent valve guides and engine cylinder heads with non-independent valve guides. Among them, the valve guide is the guiding device for the valves of the automobile engine. The valve guide plays a guiding role for the valves and transfers the heat on the valve stem to the cylinder head through the valve guide.

[0024] For engine cylinder heads with independent valve guides, valve guide holes are provided on the cylinder head for installing valve guides. For engine cylinder heads without independent valve guides, only valve guide holes and valves are included, and valve guides are not installed within the valve guide holes. During engine operation, the valve guide holes and valves experience continuous friction. When the valve guide holes wear to a certain extent, problems such as insufficient engine power, increased oil consumption, abnormal engine noise, and even cylinder scoring may occur. Currently, for engine cylinder heads with excessively worn valve guide holes, the usual repair method is to replace the entire engine cylinder head assembly, which results in extremely high repair costs.

[0025] In view of this, the present invention provides an engine cylinder head repair device. By setting a drilling structure coaxial with the valve seat hole, the drilling structure enlarges the coaxial valve guide hole directly below the valve seat hole, allowing the valve guide to be installed into the valve guide hole. This transforms an engine cylinder head that originally did not have independent valve guides into one with independent valve guides after repair. Furthermore, it avoids directly replacing the entire engine cylinder head assembly when the valve guide hole of a non-independent valve guide engine cylinder head is excessively worn, thereby effectively reducing repair costs. To make the objectives, technical solutions, and advantages of this invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] This utility model provides an engine cylinder head repair system, which includes valve guides and an engine cylinder head repair device for repairing engine cylinder heads with non-independent valve guides. (Reference) Figure 1 , Figure 1 This is a schematic diagram of an engine cylinder head repair device provided by this utility model. The engine cylinder head with a non-independent valve guide includes a valve seat hole 01 and a valve guide hole 02, wherein the valve seat is installed in the valve seat hole 01. Along the axial direction of the valve seat hole 01, the valve seat hole 01 penetrates the end face 03 of the cylinder head, and the valve guide hole 02 is provided at the end of the valve seat hole 01 facing away from the end face 03 of the cylinder head. The coaxiality of the valve seat hole 01 and the valve guide hole 02 is C, and 0mm ≤ C ≤ 0.1mm.

[0027] Continue to refer to Figure 1The engine cylinder head repair device includes a bracket 1, a drilling structure 2, and a positioning structure 3. The bracket 1 is mounted on the end face 03 of the cylinder head. The drilling structure 2 is slidably connected to the bracket 1 to enlarge the valve guide hole 02 to obtain a new valve guide hole. In the specific installation of the bracket 1, the bracket 1 can be a frame structure, and along... Figure 1 In the Z-axis direction shown, the drilling structure 2 is slidably connected to the bracket 1. That is, when the bracket 1 is installed on the end face 03 of the cylinder head, the drilling structure 2 is used to move toward or away from the end face 03 of the cylinder head. Specifically, a sliding groove can be provided on the surface of the bracket 1, and the sliding groove extends along the Z-axis direction. The drilling structure 2 is provided with a slider, which is used to insert into the sliding groove to achieve a sliding connection between the two.

[0028] When specifically setting up positioning structure 3, please refer to the following: Figure 1 , Figure 2 and Figure 3 , Figure 2 A structural diagram used to illustrate positioning structure 3. Figure 3 For display Figure 2 A cross-sectional view along the radial direction. The positioning structure 3 includes a through hole 31. When the positioning structure 3 is inserted into the valve seat hole 01, the coaxiality between the through hole 31 of the positioning structure 3 and the valve seat hole 01 is A, and A satisfies: 0mm≤A≤0.06mm.

[0029] It should be noted that, since the diameter of the valve seat hole 01 is larger than that of the enlarged valve guide hole, and the coaxiality of the valve seat hole 01 and the new valve guide hole also needs to be limited to a certain range, namely the aforementioned coaxiality C, it would be difficult to guarantee the coaxiality requirement between the valve seat hole 01 and the new valve guide hole if the drilling structure 2 is directly inserted through the valve seat hole 01 to enlarge the valve guide hole 02.

[0030] The engine cylinder head repair device provided by this utility model, by setting a positioning structure 3, and during the machining of the valve guide hole 02, firstly, when the positioning structure 3 is used to insert into the valve seat hole 01, and along the axial direction of the drilling structure 2 (e.g., ... Figure 1As shown in the Z-axis direction, when part of the drilling structure 2 is inserted into the through hole 31, the coaxiality between the through hole 31 and the valve seat hole 01 is A, and A satisfies: 0mm≤A≤0.06mm. Simultaneously, the coaxiality between the drilling structure 2 and the through hole 31 is B, and B satisfies: 0mm≤B≤0.04mm. Therefore, this ensures that the coaxiality between the drilling structure 2 and the valve seat hole 01 is within the required range (0~0.1mm). Then, along the positive Z-axis, the drilling structure 2 is moved to separate it from the through hole 31. It can be understood that the drilling structure 2 still meets the coaxiality requirement for enlarging the valve guide hole 02 at this point. Then, the positioning structure 3 is separated from the valve seat hole 01, and the drilling structure 2 is moved along the negative direction of the Z-axis toward the valve seat hole 01 to enlarge the hole, so as to effectively improve the processing efficiency and processing convenience of the valve guide hole while obtaining a new valve guide hole that meets the coaxiality requirements.

[0031] It should be noted that the newly machined valve guide hole is used to install the valve guide, so that the newly installed valve guide and the valve form a new friction pair. This avoids the need to directly replace the engine cylinder head assembly after excessive wear of the valve guide hole 02 in the engine cylinder head with non-independent valve guides, thereby effectively reducing maintenance costs.

[0032] In the specific configuration of the drilling structure 2, in one optional implementation, such as Figure 1 As shown, the drilling structure 2 includes a mounting part 21, a guide post 22, and a drill bit ( Figure 1 (Not shown in the image), the mounting part 21 is slidably connected to the bracket 1, and the mounting part 21 is provided with an installation station ( Figure 1 (not shown in the image) When the guide post 22 is installed at the installation position, the drill bit is separated from the installation position; and when the drill bit is installed at the installation position, the guide post 22 is separated from the installation position.

[0033] When specifically configuring the mounting section 21, it can include multiple clamping arm structures, such as a three-jaw chuck. The chuck body 32 is slidably connected to the bracket 1 via a fixed cover 4, and the three clamping arms move closer to each other or further apart to form an installation station, thereby enabling the clamping or release of the guide post 22 or the drill bit. It is understandable that when the installation station is clamping the guide post 22, it cannot simultaneously clamp the drill bit, and vice versa.

[0034] When the guide post 22 is installed in the installation position, the positioning structure 3 is inserted into the valve seat hole 01, and the guide post 22 is inserted into the through hole 31 of the positioning structure 3, the gap between the side wall of the guide post 22 and the hole wall of the through hole 31 can be f, where 0mm≤f≤0.01mm. Thus, during the insertion of the guide post into the through hole of the positioning structure, since the gap between the side wall of the guide post and the hole wall is infinitely close to 0, their axes almost coincide, thereby satisfying the coaxiality requirement of the guide post and the through hole while improving the ease of installation of the guide post. It is understandable that the guide post 22 can be a cylindrical structure, and the through hole 31 can be a circular hole. Then, when the side wall of the guide post 22 and the hole wall of the through hole 31 are completely fitted, i.e., f=0, their axes basically coincide, and they are coaxial.

[0035] Furthermore, when the guide post 22 is installed at the installation position, the positioning structure 3 is inserted into the valve seat hole 01, and the guide post 22 is inserted into the through hole 31 of the positioning structure 3, along the axial direction of the guide post 22 (e.g. Figure 1 (As shown in the Z-axis direction), the mounting station is positioned opposite to the through hole 31, meaning the axis of the mounting station is substantially coincident with the axis of the through hole 31. At this time, along the positive Z-axis, the mounting part 21 drives the guide post 22 to slide along the bracket 1, separating the guide post 22 from the through hole 31. Then, the drill bit is positioned at the mounting station, and the mounting station clamps the drill bit. Since the drill bit directly replaces the guide post 22 at the mounting station, and the axis of the mounting station is substantially coincident with the axis of the through hole 31, the coaxiality between the drill bit and the valve seat hole 01 still meets the requirements for machining the valve guide hole 02. Furthermore, because the guide post 22 and the drill bit are separated in this embodiment, if either one is damaged, only the damaged part needs to be replaced, which improves the ease of equipment maintenance and reduces maintenance costs. Moreover, the dimensions of the guide post 22 and the drill bit can be quickly changed according to actual processing needs to enhance the versatility of the device.

[0036] In addition, the maintenance device also includes a servo motor 5, which is located inside the fixed cover 4. Along the positive direction of the Z-axis, the drill bit can be extended into the fixed cover 4 through multiple clamping arms and connected to the servo motor 5 so that the rotation of the drill bit can be achieved through the servo motor 5.

[0037] Optionally, the guide post 22 can also be connected to the drill bit along its axial direction, and the guide post 22 and the drill bit are coaxially arranged. This means that when the bracket 1 is installed on the cylinder head, the drill bit is positioned close to the valve seat hole 01 relative to the guide post 22 to meet drilling requirements. Furthermore, when the positioning structure 3 is inserted into the valve seat hole 01 and the guide post 22 is inserted into the through hole 31, the coaxiality between the drill bit and the through hole 31 is B. Compared to separate guide posts 22 and drill bits, this effectively reduces the risk of reduced coaxiality between the drill bit and the through hole 31 due to deviations in the clamping force at the installation position during the replacement of the guide post 22 and the drill bit.

[0038] When specifically configuring the guide post 22 and the drill bit, the guide post 22 and the drill bit can be fixedly connected or form a telescopic structure. For example, when the guide post 22 and the drill bit are a telescopic structure, the guide post 22 includes an insertion hole, and the end of the drill bit is provided with an abutment portion. The abutment portion can be, for example, a cylindrical structure, and is inserted into the insertion hole along its axial direction. The abutment portion abuts against the hole wall along its circumferential sidewall to improve the coaxiality of the drill bit and the guide post 22. Furthermore, the drill bit can telescopically extend relative to the insertion hole. Thus, during the machining of the valve guide hole 02, most of the drill bit can be retracted into the insertion hole first. This avoids the risk that the guide post 22 cannot extend into the through hole 31 of the positioning structure 3 due to the drill bit abutting against the bottom of the hole during the positioning of the drilling structure 2 and the valve seat hole 01.

[0039] Additionally, the sidewall of the insertion hole is exemplarily provided with a first positioning hole and a second positioning hole, which are spaced apart along the axial direction of the insertion hole. Furthermore, the abutment portion of the drill bit is provided with a third positioning hole along its circumferential sidewall. When the third positioning hole is positioned opposite the first positioning hole, the drill bit retracts into the insertion hole of the guide post 22, and the third positioning hole and the first positioning hole can be connected by fasteners to improve the connection stability between the guide post 22 and the drill bit.

[0040] When the third positioning hole is positioned opposite the second positioning hole, the drill bit extends out of the insertion hole, and the third positioning hole and the second positioning hole are connected by fasteners to ensure a reliable connection between the guide post 22 and the drill bit.

[0041] In the specific setting of positioning structure 3, in one optional implementation, such as Figure 2As shown, the positioning structure 3 also includes a body 32, which is exemplarily a cylindrical or stepped column structure. A through hole 31 penetrates the body 32 and is coaxial with the outer side wall of the body 32. During the process of enlarging the valve guide hole 02, the body 32 can be inserted into the valve seat hole 01, with the gap between the outer side wall of the body 32 and the hole wall of the valve seat hole 01 being n, where 0 ≤ n ≤ 0.025 mm. During the insertion of the positioning structure 3 into the valve seat hole 01, since the gap between the side wall of the positioning structure 3 and the hole wall of the valve seat hole 01 is infinitely close to 0, their axes almost coincide. This satisfies the coaxiality requirement between the positioning structure 3 and the valve seat hole 01 while improving the ease of installation of the positioning structure 3 and simplifying the positioning structure 3.

[0042] Understandably, since the part of the positioning structure 3 that connects to the valve seat hole 01 is cylindrical, and the guide post 22 is also cylindrical, when the positioning structure 3 is connected to the valve seat hole 01 and the axis of the positioning structure 3 is completely aligned with the valve seat hole 01, the gap between the outer wall of the positioning structure 3 and the wall of the valve seat hole 01 is 0–0.025 mm. When the guide post 22 is connected to the through hole 31 of the positioning structure 3 and the axis of the guide post 22 is completely aligned with the through hole 31, the gap between the guide post 22 and the wall of the through hole 31 is 0–0.01 mm.

[0043] It is worth mentioning that, such as Figure 2 As shown, the end face of the positioning structure body 32 is provided with a groove 33. The groove 33 includes a first sidewall 331, a second sidewall 332, and an open end. The angle between the extended surfaces of the first sidewall 331 and the second sidewall 332 is an acute angle. The first sidewall 331 and the second sidewall 332 are tangent to the wall of the through hole 31, and the open end of the groove 33 is positioned opposite to the included angle. During the process of enlarging the valve guide hole 02, the guide post 22 can slide along the sidewall towards the through hole 31 along the open end of the groove 33. Since the angle between the first sidewall 331 and the second sidewall 332 is an acute angle, it is beneficial to improve the positioning convenience between the guide post 22 and the through hole 31, thereby improving the processing convenience and processing accuracy of the device.

[0044] Because the inner diameter of the valve seat bore 01 varies between different engine models, the inner diameters of the intake valve seat bore and exhaust valve seat bore also differ within the same engine. For example, the inner diameter of the exhaust valve seat bore is 54mm, while the inner diameter of the intake valve seat bore is 47mm. Therefore, in one optional embodiment, reference is also made to... Figure 2 and Figure 3The body 32 can include a first abutting part 321, a second abutting part 322, and a third abutting part 323. The abutting parts are, by example, cylindrical structures, and are stacked along the axial direction of the through hole 31. The end face of the first abutting part 321 is connected to the end face of the third abutting part 323 through the second abutting part 322. The diameter of the first abutting part 321 is D1, the diameter of the second abutting part 322 is D2, and the diameter of the third abutting part 323 is D3, where D3 < D2 < D1. That is, the positioning structure 3 is a stepped shaft-like structure. Thus, when the valve seat hole 01 is fitted with the third abutting part 323, the third abutting part 321... The gap between the side wall of the positioning structure 3 and the wall of the valve seat hole 01 is n, and 0≤n≤0.025mm. Along the Z-axis direction, the end face of the second abutment 322 abuts against the end face of the valve seat hole 01. When the valve seat hole 01 is adapted to the second abutment 322, the gap between the side wall of the second abutment 322 and the wall of the valve seat hole 01 is n, and 0≤n≤0.025mm. The third abutment 323 extends into the valve seat hole 01 and is spaced apart from the hole wall. At the same time, along the Z-axis direction, the end face of the first abutment 321 abuts against the end face of the valve seat hole 01. This satisfies the stable connection between the positioning structure 3 and the valve seat hole 01 while improving the versatility of the positioning structure 3.

[0045] It is worth mentioning that the sidewall of the first abutment portion 321 can also include a first cut surface 324 and a second cut surface 325. Specifically, the first cut surface 324 and the second cut surface 325 are spaced apart, and the first cut surface 324 and the second cut surface 325 are connected by an arc surface. This allows the user to quickly move the positioning structure 3 by simultaneously holding the first cut surface 324 and the second cut surface 325, which improves the ease of operation of the positioning structure 3.

[0046] In a specific implementation of the bracket 1, such as... Figure 1 As shown, bracket 1 includes a mounting base and an electromagnetic structure. The electromagnetic structure is mounted on the mounting base, which abuts against the end face 03 of the cylinder head. The electromagnetic structure exists in an energized and de-energized state. When the electromagnetic structure is energized, the mounting base and the end face 03 of the cylinder head are magnetic. When the electromagnetic structure is de-energized, bracket 1 can move along the end face 03 of the cylinder head. It can be understood that when the coaxiality of the drilling structure 2 and the through hole 31 is B, energizing the electromagnetic structure stabilizes the positions of the drilling structure 2 and the through hole 31. This ensures that the axial machining position of the drill bit is consistent with the machining position of the valve guide hole 02 during the machining process. This is used to control the coaxiality and runout range of the new valve guide hole after reaming with the valve seat ring hole 01, improving the maintenance reliability of the cylinder head.

[0047] After understanding the structure of the engine cylinder head repair system provided by this utility model, the repair process of the cylinder head is described below based on the embodiment with separate guide posts 22 and drill bits, and in combination with actual conditions:

[0048] First, remove the old valve seats from the engine cylinder head and clean the bottom surface of the cylinder head, including the contact surface between the valve seats and the cylinder head, with a cleaning agent. Then wipe it clean with a non-woven cloth to ensure there is no dust or debris.

[0049] Then, place the engine cylinder head repair device stably on the end face of the cylinder head. The positioning structure 3 is inserted into the valve seat hole 01, and the guide post 22 is installed at the installation position close to the valve seat hole 01. Manually adjust the position of the bracket 1 so that the axis of the guide post 22 is as close as possible to the axis of the valve seat hole 01, allowing the guide post 22 to smoothly extend into the through hole 31 of the positioning structure 3. When the guide post 22 can move freely axially within the through hole 31 of the positioning structure 3, the device position is determined.

[0050] Then, the electromagnetic structure is energized, and the mounting base and the cylinder head end face are magnetically attracted, ensuring that the device will not move. Next, the positioning structure 3 is removed from the cylinder head, the guide post 22 is removed from the mounting station, and the drill bit is installed in the mounting station to enlarge the valve guide hole 02. After enlarging, a reamer is installed in the mounting station to improve the machining accuracy of the guide hole.

[0051] Finally, flip the cylinder head over and use a deburr remover to clean the burrs around the valve guide hole 02 until the hole wall is smooth. Then, clean the newly machined valve guide hole with a cleaning agent, and insert the valve guide into the valve guide press-fit tool to press it into the guide hole of the cylinder head until the lower surface of the press-fit tool contacts the cylinder head. At this point, the valve guide installation is complete. Then, re-press-fit the new valve seat rings to complete the cylinder head repair.

[0052] In summary, the engine cylinder head repair device provided by this utility model, by setting a positioning structure 3, and during the process of enlarging the valve guide hole 02, firstly, when the positioning structure 3 is inserted into the valve seat hole 01, and along the axial direction of the drilling structure 2 (e.g., ... Figure 1(As shown in the Z-axis direction), when part of the drilling structure 2 is inserted into the through hole 31, the coaxiality between the through hole 31 and the valve seat hole 01 is A, and A satisfies: 0mm≤A≤0.06mm. Simultaneously, the coaxiality between the drilling structure 2 and the through hole 31 is B, and B satisfies: 0mm≤B≤0.04mm. Therefore, this ensures that the coaxiality between the drilling structure 2 and the valve seat hole 01 is within the required range. Then, along the positive Z-axis, the drilling structure 2 is moved to separate from the through hole 31. It can be understood that the drilling structure 2 still meets the coaxiality requirement for enlarging the valve guide hole 02. Then, the positioning structure 3 is separated from the valve seat hole 01, and the drilling structure 2 is moved along the negative Z-axis towards the valve seat hole 01 to enlarge the hole. This effectively improves the processing efficiency and ease of processing the new valve guide hole 02 while processing the new valve guide hole.

[0053] Furthermore, the newly machined valve guide hole is used to install the valve guide, so that the newly installed valve guide and the valve form a new friction pair. This avoids directly replacing the engine cylinder head assembly after excessive wear of the valve guide hole 02 in the engine cylinder head with non-independent valve guides, thereby effectively reducing maintenance costs.

[0054] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An engine cylinder head repair device, wherein the cylinder head includes valve seat holes, characterized in that, The device includes a bracket, a drilling structure, and a positioning structure. The bracket is used to mount on the end face of the cylinder head, and the drilling structure is slidably connected to the bracket, wherein: The positioning structure includes a through hole. When the positioning structure is used to be inserted into the valve seat hole, the through hole is used to have a coaxiality of A with the valve seat hole, and A satisfies: 0mm≤A≤0.06mm. When the positioning structure is used to be inserted into the valve seat hole, and a portion of the drilling structure is inserted into the through hole along the axial direction of the drilling structure, the coaxiality of the drilling structure and the through hole is B, and B satisfies: 0mm≤B≤0.04mm.

2. The engine cylinder head repair device according to claim 1, characterized in that, The drilling structure includes an installation station, a guide post, and a drill bit. The installation station is slidably connected to the bracket. When the guide post is installed at the installation station, the drill bit is separated from the installation station. When the drill bit is installed at the installation station, the guide post is separated from the installation station. When the guide post is installed at the installation station, the positioning structure is used to insert into the valve seat hole, and the guide post is inserted into the through hole, the installation station and the through hole are arranged opposite to each other along the axial direction of the guide post. When the installation station is positioned opposite the through hole, the installation station is used to install the guide post or the drill bit.

3. The engine cylinder head repair device according to claim 2, characterized in that, When the guide post is installed at the installation position, the positioning structure is used to insert into the valve seat hole, and the guide post is inserted into the through hole, the gap between the side wall of the guide post and the hole wall of the through hole is f, and 0mm≤f≤0.01mm.

4. The engine cylinder head repair device according to claim 1, characterized in that, The drilling structure includes a guide post and a drill bit. Along the axial direction of the guide post, the guide post is connected to the drill bit, and the guide post and the drill bit are coaxial. When the positioning structure is used to insert into the valve seat hole and the guide post is inserted into the through hole, the coaxiality of the drill bit and the through hole is B.

5. The engine cylinder head repair device according to claim 1, characterized in that, The positioning structure also includes a body, the through hole penetrates the body and is coaxial with the outer side wall of the body; when the body is used to be inserted into the valve seat hole, the gap between the outer side wall of the body and the hole wall of the valve seat hole is n, and 0≤n≤0.025mm.

6. The engine cylinder head repair device according to claim 5, characterized in that, The end face of the body is provided with a groove, the groove includes a first sidewall, a second sidewall and an open end, the angle between the extension surface of the first sidewall and the extension surface of the second sidewall is an acute angle, and the first sidewall and the second sidewall are respectively tangent to the hole wall of the through hole; the open end is disposed opposite to the included angle.

7. The engine cylinder head repair device according to claim 5, characterized in that, The body includes a first abutting part, a second abutting part, and a third abutting part. Along the axial direction of the through hole, the first abutting part, the second abutting part, and the third abutting part are stacked. The end face of the first abutting part is connected to the end face of the third abutting part through the second abutting part. The diameter of the first abutting part is D1, the diameter of the second abutting part is D2, and the diameter of the third abutting part is D3, and D3 < D2 < D1.

8. The engine cylinder head repair device according to claim 7, characterized in that, The sidewall of the first abutting part includes a first cut surface and a second cut surface, the first cut surface and the second cut surface are spaced apart, and the first cut surface and the second cut surface are connected by an arc surface.

9. The engine cylinder head repair device according to claim 1, characterized in that, The bracket includes a mounting base and an electromagnetic structure. The electromagnetic structure is disposed on the mounting base, which is used to abut against the end face of the cylinder head. The electromagnetic structure has an energized state and an de-energized state, and when the electromagnetic structure is in the energized state, the mounting base is magnetically attracted to the end face of the cylinder head.

10. An engine cylinder head repair system, characterized in that, Includes valve guides, and an engine cylinder head repair device as described in any one of claims 1-9, wherein: The engine cylinder head repair device is used to process valve guide holes, and the valve guides are inserted into the valve guide holes.

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