A method for machining a camshaft bore

Abstract

The application discloses a camshaft hole processing method for realizing camshaft bearing cover cleaning without disassembly. The method comprises the following steps: assembling a tool rocker arm shaft, an engine cylinder cover and a camshaft bearing cover, wherein the tool rocker arm shaft comprises a rocker arm shaft body, a first hole group, a second hole group and a third hole group, the first hole group and the second hole group are arranged at the left and right ends of the rocker arm shaft body respectively, the third hole group is arranged between the first hole group and the second hole group, and an inner hole is arranged in the rocker arm shaft body along an axis center line; high-pressure cooling liquid is sprayed from a high-pressure cooling liquid nozzle to the inner hole of the tool rocker arm shaft to continuously flush the camshaft bearing cover; the camshaft hole processing equipment is used to process the camshaft hole; and the camshaft bearing cover and the tool rocker arm shaft are subjected to drying treatment.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a method for machining a camshaft hole. Background Technology

[0002] The camshaft is a component of a piston engine. It is assembled with a camshaft bearing cap. The camshaft bearing cap's function is to axially fix the camshaft, preventing axial movement, and simultaneously supply lubricating oil to the camshaft through oil passages within the bearing cap for lubrication and cooling. In an overhead camshaft engine, the oil passages within the camshaft bearing cap are connected to the oil passages within the engine rocker arm shaft.

[0003] In existing technologies, before machining the camshaft bore, the camshaft bearing cap and engine rocker arm shaft are usually installed first. However, during the machining of the camshaft bore, metal filings are easily splashed or carried into the lubrication passages of the camshaft bearing cap by the cutting tool. To ensure cleanliness and avoid metal filings in the lubrication passages, the camshaft bearing cap is usually removed for cleaning after machining the camshaft bore, and then the cleaning fluid is dried. However, disassembling and cleaning the camshaft bearing cap is not only time-consuming, but repeated disassembly and reassembly can easily damage the camshaft bearing cap, causing irreversible damage. Summary of the Invention

[0004] This application provides a method for machining camshaft holes, which enables camshaft hole machining without disassembling the camshaft bearing cover for cleaning.

[0005] This application provides a method for machining a camshaft hole, the method comprising:

[0006] The tooling rocker arm shaft, engine cylinder head, and camshaft bearing cover are assembled together. The tooling rocker arm shaft includes a rocker arm shaft body, a first hole group, a second hole group, and a third hole group. The first hole group and the second hole group are respectively located at the left and right ends of the rocker arm shaft body. The third hole group is located between the first hole group and the second hole group. The rocker arm shaft body has a through hole along the shaft centerline.

[0007] High-pressure coolant is sprayed from the high-pressure coolant nozzle into the inner hole of the tooling rocker arm shaft to continuously flush the camshaft bearing cover.

[0008] Camshaft holes are machined using camshaft hole machining equipment;

[0009] The engine cylinder head, the camshaft bearing cover, and the tooling rocker arm shaft are dried.

[0010] Optionally, the drying process for the engine cylinder head, the camshaft bearing cover, and the tooling rocker arm shaft includes:

[0011] The engine cylinder head, the camshaft bearing cover, and the tooling rocker arm shaft are vacuum dried or blown dry.

[0012] Optionally, after machining the camshaft hole using the camshaft hole machining equipment, and before drying the engine cylinder head, the camshaft bearing cap, and the tooling rocker arm shaft, the machining method further includes:

[0013] The camshaft bearing cover and the tooling rocker arm shaft are cleaned using a cleaning solution.

[0014] Optionally, the first hole group and the second hole group each include one through-hole, and the third hole group includes an even number of through-holes.

[0015] Optionally, the through holes in the first hole group, the second hole group, and the third hole group are all through circular holes, and the openings of the through holes are all chamfered.

[0016] Optionally, the through holes in the first hole group, the second hole group, and the third hole group all include a first hole segment and a second hole segment, with the first hole segment located above the second hole segment and the diameter of the first hole segment being smaller than the diameter of the second hole segment.

[0017] Optionally, the first hole section is provided with threads that mate with the fixing bolt.

[0018] Optionally, the rocker arm shaft is provided with a plurality of recesses, and the first hole group, the second hole group and the third hole group are disposed in the recesses.

[0019] Optionally, the rocker arm shaft consists of two sets of sub-shafts with identical structures.

[0020] Optionally, the tooling rocker arm shaft is made of rust-resistant material.

[0021] As can be seen from the above technical solutions, this application has the following advantages:

[0022] The engine rocker arm shaft is replaced with a tooling rocker arm shaft. The tooling rocker arm shaft, engine cylinder head, and camshaft bearing cap are assembled together. The tooling rocker arm shaft has a through-hole at its center. During camshaft machining, a high-pressure coolant nozzle is added. The nozzle sprays high-pressure coolant into the inner hole of the tooling rocker arm shaft. The high-pressure coolant then flows in through the connection with the camshaft bearing cap and exits from the lubrication passages of the camshaft bearing cap. This continuous flushing with high-pressure coolant prevents metal filings from entering the lubrication passages of the camshaft bearing cap, thus ensuring the cleanliness of the bearing cap. Finally, only drying is required to complete the machining. With the camshaft hole machining method provided in this application, the camshaft bearing cap does not need to be disassembled and cleaned after the shaft hole machining is completed, protecting the bearing cap from damage while ensuring its cleanliness. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic flowchart of an embodiment of the camshaft hole machining method provided in this application;

[0025] Figure 2 A schematic diagram of the main structure of the tooling rocker arm shaft in the machining method of the camshaft hole provided in this application;

[0026] Figure 3 A schematic diagram of the assembly of the tooling rocker arm shaft, engine cylinder head, and camshaft bearing cover in the machining method of the camshaft hole provided in this application;

[0027] Figure 4 A schematic cross-sectional view of the tooling rocker arm shaft in the camshaft hole machining method provided in this application;

[0028] Figure 5 A schematic diagram of the flow direction of high-pressure coolant in the machining method of the camshaft hole provided in this application. Detailed Implementation

[0029] This application provides a method for machining camshaft holes, which enables camshaft hole machining without disassembling the camshaft bearing cover for cleaning.

[0030] Please see Figure 1 , Figure 2 and Figure 3 ,in Figure 1 An embodiment of the machining method for the camshaft hole provided in this application includes:

[0031] 101. Assemble the tooling rocker arm shaft, engine cylinder head, and camshaft bearing cover.

[0032] The camshaft is a component in an engine, its function being to control the opening and closing of the valves. Typically, the camshaft rotates at high speeds and needs to withstand significant torque. Since the valve movement affects an engine's power and operating characteristics, and the camshaft bore provides axial fixation for the camshaft, machining the camshaft bore is a crucial step in engine manufacturing. For overhead camshaft engines, the camshaft bore is formed by the cylinder head and camshaft bearing cap 3. Therefore, before machining the camshaft bore, the engine cylinder head 2, camshaft bearing cap 3, and engine rocker arm shaft must usually be installed first. The camshaft bore is then machined after the entire assembly is complete to ensure assembly accuracy.

[0033] Existing engine rocker arm shafts have complex internal lubrication channels, multiple holes drilled in the outer wall to connect to the internal oil channels, and both ends of the rocker arm shaft are sealed with steel balls or plugs. This process is complex and costly. If the engine rocker arm shaft is damaged during camshaft hole machining, it will need to be replaced. Based on these reasons, and considering the cumbersome process of disassembling and cleaning the camshaft bearing cover 3, this embodiment provides a tooling rocker arm shaft 1. This tooling not only replaces the engine rocker arm shaft during camshaft hole machining, preventing damage to the engine rocker arm shaft during the machining process, but also allows for cleaning of the camshaft bearing cover 3 without disassembling it after camshaft hole machining.

[0034] Please see Figure 2 , Figure 2 This is a schematic diagram of the main structure of the tooling rocker arm shaft 1. In this embodiment, the tooling rocker arm shaft 1 includes a rocker arm shaft body, a first group of holes, a second group of holes, and a third group of holes. The first and second groups of holes are respectively located at the left and right ends of the rocker arm shaft body, and the third group of holes is located between the first and second groups of holes. An internal hole 11 is provided inside the rocker arm shaft body along its center line. Compared to existing engine rocker arm shafts, the tooling rocker arm shaft 1 provided in this embodiment eliminates the complex internal lubrication channels and oil outlet holes on the outer wall, replacing them with an internal hole 11 that penetrates along the center line of the shaft. The specific arrangement of the first, second, and third groups of holes depends on the engine rocker arm shaft being replaced, and all are used to fix it to the camshaft bearing cap 3. Please refer to... Figure 3 , Figure 3 This is an assembly diagram of the tooling rocker arm shaft 1, the engine cylinder head 2, and the camshaft bearing cover 3.

[0035] 102. High-pressure coolant is sprayed from the high-pressure coolant nozzle into the inner hole of the tooling rocker arm shaft to continuously flush the camshaft bearing cover.

[0036] After the tooling rocker arm shaft 1, engine cylinder head 2 and camshaft bearing cover 3 are assembled, the external high-pressure coolant nozzle is aimed at the inner hole 11 of the tooling rocker arm shaft 1 and sprays high-pressure coolant. The high-pressure coolant flows into the camshaft bearing cover 3 from the connection between the tooling rocker arm shaft 1 and the camshaft bearing cover 3, and then sprays out from the lubrication oil passage of the camshaft bearing cover 3 to continuously flush the camshaft bearing cover 3.

[0037] 103. Use camshaft hole machining equipment to machine camshaft holes;

[0038] After the high-pressure coolant fills the lubrication channels of the camshaft bearing cover 3 and sprays out, the camshaft hole can be machined using camshaft hole machining equipment. Because the high-pressure coolant continuously flushes the lubrication channels of the camshaft bearing cover 3, it prevents iron filings from entering the lubrication channels, thus ensuring the cleanliness of the bearing cover. It should be noted that this embodiment does not limit the machining equipment or method for the camshaft hole.

[0039] 104. Dry the camshaft bearing cover and the tooling rocker arm shaft.

[0040] After the camshaft bore is machined, stop the high-pressure coolant nozzle from spraying. At this point, only the camshaft bearing cap 3 and the tooling rocker arm shaft 1 need to be dried; there is no need to remove the camshaft bearing cap 3 for cleaning. After drying, remove the tooling rocker arm shaft 1, and then install the engine rocker arm shaft.

[0041] In some specific embodiments, before drying the camshaft bearing cover 3 and the tooling rocker arm shaft 1, a cleaning solution can be used to clean the camshaft bearing cover 3 and the tooling rocker arm shaft 1. The cleaning solution is also sprayed into the inner hole 11 of the tooling rocker arm shaft 1 and sprayed out through the lubricating oil passage of the camshaft bearing cover 3 to further improve the cleanliness of the camshaft bearing cover 3. After cleaning, the camshaft bearing cover 3 can be dried by vacuum drying or air drying.

[0042] In this embodiment, a tooling rocker arm shaft 1 is used to replace the engine rocker arm shaft. The tooling rocker arm shaft 1, engine cylinder head 2, and camshaft bearing cover 3 are assembled together. The tooling rocker arm shaft 1 has a through-hole 11 at its center. During camshaft machining, a high-pressure coolant nozzle is added. The nozzle sprays high-pressure coolant into the inner hole 11 of the tooling rocker arm shaft 1. The high-pressure coolant then flows in through the connection with the camshaft bearing cover 3 and is sprayed out from the lubrication passage of the camshaft bearing cover 3. This continuous flushing with high-pressure coolant prevents metal filings from entering the lubrication passage of the camshaft bearing cover 3, thus ensuring the cleanliness of the bearing cover. Finally, drying is all that is needed to complete the machining. With the camshaft hole machining method provided in this application, the camshaft bearing cover 3 does not need to be disassembled and cleaned after the shaft hole machining is completed, thus protecting the bearing cover from damage while ensuring its cleanliness.

[0043] Please see Figure 2 and Figure 4 The tooling rocker arm shaft 1 in the machining method of the camshaft hole provided in this application will be described in detail below.

[0044] The tooling rocker arm shaft 1 provided in this application includes:

[0045] The rocker arm shaft, the first hole group, the second hole group and the third hole group are respectively located at the left and right ends of the rocker arm shaft, and the third hole group is located between the first hole group and the second hole group. The rocker arm shaft has a through hole 11 along the center line of the shaft.

[0046] Optionally, the first hole group and the second hole group each include one through hole, and the third hole group includes an even number of through holes. The through holes in the first hole group, the second hole group and the third hole group are all through circular holes, and the openings of the through holes are all chamfered.

[0047] In this embodiment, the first and second hole groups are located at the left and right ends of the rocker arm shaft, respectively, and each of the first and second hole groups includes one through-hole. The third hole group is located between the first and second hole groups, and the second hole group includes an even number of through-holes. The specific spacing of the first, second, and third hole groups and the number of through-holes depend on the engine rocker arm shaft being replaced. All through-holes are through circular holes and communicate with the inner hole 11 of the rocker arm shaft. Each through-hole has a chamfer at its opening. The inner hole 11 of the rocker arm shaft can be machined or cast integrally. If two high-pressure coolant nozzles are used, neither end of the inner hole 11 is sealed. If only one high-pressure coolant nozzle is used, the inner hole 11 can be sealed on one side.

[0048] Optionally, the through holes in the first hole group, the second hole group and the third hole group all include a first hole segment 12 and a second hole segment 13. The first hole segment 12 is located above the second hole segment 13. The diameter of the first hole segment 12 is smaller than the diameter of the second hole segment 13. The first hole segment 12 is provided with threads that mate with the fixing bolt.

[0049] In this embodiment, all through-holes within the rocker arm shaft include a first hole segment 12 and a second hole segment 13. The first hole segment 12 is located above the second hole segment 13. The first hole segment 12 is used to mate with a fixing bolt. The diameter of the second hole segment 13 is larger than that of the first hole segment 12, forming a gap between it and the fixing bolt for high-pressure coolant to pass through. Please refer to the following for details. Figure 5 High-pressure coolant is sprayed in through the inner hole 11, then flows into the camshaft bearing cover 3 through the gap between the second hole section 13 of each through-bolt hole and the fixing bolt, and then sprayed out from the lubrication oil passage of the camshaft bearing cover 3.

[0050] Optionally, the rocker arm shaft is provided with several recessed platforms, and the first hole group, the second hole group and the third hole group are set in the recessed platforms.

[0051] In this embodiment, to facilitate the installation of the fixing bolts, the rocker arm shaft is provided with several rectangular recesses, which are used to accommodate the first hole group, the second hole group and the third hole group.

[0052] Optionally, the rocker arm shaft consists of two sets of sub-shafts with identical structures.

[0053] To save on processing and transportation costs, two sets of identical sub-shafts can be spliced ​​together to form a complete tooling rocker arm shaft 1.

[0054] Optionally, the tooling rocker arm shaft 1 is made of rust-resistant material.

[0055] In this embodiment, the tooling rocker arm shaft 1 is only used for machining the camshaft hole. Therefore, the tooling rocker arm shaft 1 does not need to reach the specified strength and rigidity as the engine rocker arm shaft. However, the tooling rocker arm shaft 1 needs to be flushed by high-pressure coolant or cleaning fluid. Therefore, it can be made of materials with anti-rust function such as stainless steel or aluminum, thereby saving costs.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0057] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0058] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0059] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0060] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

Claims

1. A method for machining a camshaft hole, characterized in that, The processing method includes: The tooling rocker arm shaft, engine cylinder head, and camshaft bearing cover are assembled together. The tooling rocker arm shaft includes a rocker arm shaft body, a first hole group, a second hole group, and a third hole group. The first hole group and the second hole group are respectively located at the left and right ends of the rocker arm shaft body. The third hole group is located between the first hole group and the second hole group. The rocker arm shaft body has a through hole along the shaft centerline. The first hole group and the second hole group each contain one through-pin hole. The third hole group contains an even number of through-pin holes. The through-pin holes in the first hole group, the second hole group, and the third hole group all contain a first hole segment and a second hole segment. The first hole segment is located above the second hole segment. The diameter of the first hole segment is smaller than the diameter of the second hole segment. The first hole segment is provided with threads that mate with fixing bolts. High-pressure coolant is sprayed from the high-pressure coolant nozzle into the inner hole of the tooling rocker arm shaft to continuously flush the camshaft bearing cover. Camshaft holes are machined using camshaft hole machining equipment; The camshaft bearing cover and the tooling rocker arm shaft are dried.

2. The processing method according to claim 1, characterized in that, The drying process for the camshaft bearing cover and the tooling rocker arm shaft includes: The camshaft bearing cover and the tooling rocker arm shaft are vacuum dried or blown dry.

3. The processing method according to claim 1, characterized in that, After machining the camshaft hole using the camshaft hole machining equipment, and before drying the camshaft bearing cap and the tooling rocker arm shaft, the machining method further includes: The camshaft bearing cover and the tooling rocker arm shaft are cleaned using a cleaning solution.

4. The processing method according to claim 1, characterized in that, The through holes in the first hole group, the second hole group, and the third hole group are all through circular holes, and the openings of the through holes are all chamfered.

5. The processing method according to any one of claims 1 to 3, characterized in that, The rocker arm shaft is provided with several recessed platforms, and the first hole group, the second hole group and the third hole group are arranged in the recessed platforms.

6. The processing method according to any one of claims 1 to 3, characterized in that, The rocker arm shaft consists of two sets of sub-shafts with identical structures.

7. The processing method according to any one of claims 1 to 3, characterized in that, The tooling rocker arm shaft is made of rust-resistant material.

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