Exhaust cam lobe and self-adjusting punching device thereof

Abstract

The application discloses an exhaust cam piece and a self-adjusting punching equipment thereof, relates to the technical field of engine exhaust cam pieces, and aims to solve the technical problems that traditional equipment is difficult to process the circular arc profile of the exhaust cam piece and the poor geometric shape consistency of the oil hole, and comprises a punching machine tool, a linear motion module and a template arranged on the left side of the top of the punching machine tool, a punching mechanism arranged on the right side of the top of the punching machine tool, a limiting assembly and a lubricating assembly. The application successfully realizes the high integration of straight hole punching and milling of a complex arc-shaped inner wall through the innovative design of a reconfigurable milling cutter power transmission system. The equipment utilizes the opposite and reverse movement of the movable rods to drive the first and second milling cutters to intelligently switch between the rigid combination and universal hinged modes, so that the machining of the straight base hole and the precise milling of the internal continuous arc-shaped flow surface can be completed in sequence at the same station only through one clamping, and the high-precision, integrated and automatic machining of the high-performance cam piece oil hole is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine exhaust cam plate, more particularly to an exhaust cam plate and a self-adjusting punching device thereof. BACKGROUND

[0002] At present, the widely used exhaust cam plate has a simple straight hole for lubricating oil hole, which has a significant performance bottleneck. Under the condition of low speed, the oil hole lacks flow guiding function, resulting in dispersed oil flow and uneven oil film, which is difficult to effectively lubricate the core contact area, not only aggravating the wear of the cam and the rocker arm, but also having the problems of poor heat dissipation and high noise. Under the condition of high speed, the oil flow direction is more chaotic, which cannot provide sufficient lubrication strength to the cam protruding part bearing high frequency impact, which is easy to cause surface peeling and other early failures, and the oil passage is easy to be carbonized and blocked, which seriously affects the reliability and durability of the engine valve train.

[0003] More importantly, the traditional manufacturing technology cannot process complex structure oil holes that can solve the above performance problems with high precision and high efficiency. The existing process relies on multiple equipment such as drilling machine and milling machine to process straight hole and inner wall profile in multiple steps. Multiple clamping inevitably introduces cumulative error, resulting in poor product consistency, and the production process is long and costly, which fundamentally restricts the realization and popularization of high-performance cam plate. In view of this, we propose an exhaust cam plate. SUMMARY

[0004] The purpose of the present application is to provide an exhaust cam plate and a self-adjusting punching device thereof to solve the technical problems that the traditional equipment is difficult to process the circular arc profile of the exhaust cam plate and the oil hole has poor geometric shape consistency.

[0005] To solve the above technical problems, the present application provides the following technical scheme: an exhaust cam plate self-adjusting punching device, comprising a punching machine tool, a linear motion module arranged at the top of the punching machine tool, a template, a punching mechanism, a limiting component and a lubricating component.

[0006] The punching mechanism comprises a servo motor capable of transversely or longitudinally translating, the servo motor can translate left and right and forward and backward, the output shaft of the servo motor is drivingly connected with a first milling cutter and a second milling cutter, the first milling cutter is sleeved with movable rods capable of moving towards each other or moving away from each other at both ends, and the two movable rods are drivingly connected with the second milling cutter and the output shaft of the servo motor through universal shafts.

[0007] When the two movable rods move in opposite directions, the first milling cutter, the second milling cutter and the servo motor output shaft combination form a complete milling cutter, and the milling cutter can be driven by the servo motor to punch a straight circular hole; when the two movable rods move in opposite directions, the first milling cutter is hinged between the servo motor output shaft and the first milling cutter, and the first milling cutter is hinged between the first milling cutter and the second milling cutter, and is driven by the servo motor and the two-dimensional translation mechanism, and the center point of the first milling cutter is used as the shaft to rotate and the motor drives the first milling cutter to rotate, which can punch an arc-shaped inner wall. The present application successfully realizes the high integration of straight hole punching and complex arc-shaped inner wall milling function through the innovative design of the reconfigurable milling cutter power transmission system. The device utilizes the opposite and reverse movement of the movable rods to drive the first and second milling cutters to intelligently switch between rigid combination and universal hinge mode, thereby completing the machining of straight base hole and the precision milling of internal continuous arc-shaped flow surface in sequence only once clamping is required at the same station. The technical problems of large cumulative error, low arc contour precision, low processing efficiency and poor oil hole geometric consistency caused by traditional multi-station processing are solved, and high-precision, integrated and automated processing of high-performance cam plate oil holes is realized.

[0008] Preferably, the punching mechanism further comprises a hydraulic module fixedly arranged on the top of the punching machine tool, and the output end of the hydraulic module is fixedly connected with a fixed frame, the inside of the fixed frame is slidingly connected with a punching support plate, and the limiting rod in the fixed frame passes through the hole in the punching support plate, the top of the punching support plate is fixedly connected with an electric push rod, and the protective frame on the servo motor is slidingly adapted on the top of the punching support plate, and the output end of the electric push rod is fixedly connected with the protective frame on the servo motor.

[0009] Preferably, an annular groove is formed in the end surface of the first milling cutter, the inside of the first milling cutter is symmetrically structured to sleeve the inner wall of the limiting ring with a protrusion, two hydraulic channels are formed in one end of the first milling cutter, and the output ends of the hydraulic channels are in communication with the inside of the first milling cutter.

[0010] Preferably, the movable rods are slidingly adapted in the inside of the limiting ring, the two movable rods are fixedly connected with sealing caps at one end, the sealing caps are slidingly and sealingly adapted in the inside of the first milling cutter, the output ends of the hydraulic channels are located between the two sealing caps, and the universal shaft is movably connected with the movable rods at one end.

[0011] Preferably, the limiting assembly comprises a limiting frame fixedly connected with one side of the protective frame on the servo motor, a limiting rail is formed in the lower surface of the limiting frame, the limiting rail is composed of a straight rail and an arc rail, and the straight rail and the arc rail are communicated.

[0012] Preferably, the limiting rail is internally adapted with an arc-shaped sliding rail through a protrusion, and the protrusion on the arc-shaped sliding rail penetrates through the limiting frame, the bottom of the arc-shaped sliding rail is adapted with a transmission frame, and the transmission frame is sleeved in the annular groove, the top of the limiting frame is rotationally connected with a telescopic rod, and the output end of the telescopic rod is hingedly adapted with the protrusion on the arc-shaped sliding rail.

[0013] Preferably, the lubricating assembly comprises an annular frame fixedly arranged at one end of the first milling cutter and in communication with the hydraulic channel, and a sealing cover rotationally and sealingly adapted with the side surface of the annular frame.

[0014] Preferably, one side inner wall of the sealing cap is adapted with a valve plate through a plug rod, and the end of the plug rod on the valve plate is in movable contact with one side of the limiting ring.

[0015] Preferably, the surface of the plug rod on the valve plate is sleeved with a conical spring, and one end of the movable rod is provided with a liquid flow channel in communication with the sealing cap.

[0016] Preferably, the cam piece body is installed on the exhaust camshaft in the engine, one side of the cam piece body is provided with an axle hole matched with the side surface of the exhaust camshaft, and the side surface of the cam piece body is provided with an oil hole with an arc-shaped inner wall arranged inside.

[0017] The side surface of the cam piece body is provided with an oil hole with an arc-shaped inner wall arranged inside.

[0018] When the cam piece body rotates at low speed, the oil flow is guided to form stable laminar flow and directional injection through the arc-shaped inner wall, so as to lubricate the contact area of the cam and the rocker arm; when the cam piece body rotates at high speed, the arc-shaped inner wall cooperates with the centrifugal force to make the oil flow in turbulent flow and high-pressure injection.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1. The present application successfully realizes the high integration of straight hole impact drilling and complex arc-shaped inner wall milling through the innovative design of the reconfigurable milling cutter power transmission system. The device drives the first and second milling cutters to intelligently switch between rigid combination and universal hinged mode through the opposite and reverse movement of the movable rod, so that the machining of straight base hole and the precision milling of internal continuous arc-shaped flow surface can be completed in sequence only once clamping at the same station, thereby solving the technical problems of large cumulative error, low arc contour precision, low processing efficiency and poor oil hole geometric consistency caused by traditional multi-station processing, and realizing the high-precision, integrated and automatic processing of high-performance cam piece oil holes.

[0021] 2. During milling operations, the limiting component of this invention precisely limits the tilting and rotation trajectory of the milling cutter through the cooperation of the arc-shaped slide rail and the limiting track, ensuring the curvature accuracy of the arc-shaped inner wall; at the same time, the lubrication component synchronously delivers polishing fluid, which, in conjunction with the milling cutter cutting and the reciprocating movement of the second milling cutter, grinds and polishes the hole wall in real time, effectively reducing burrs and scratches, improving the smoothness of the inner wall of the oil hole, and avoiding subsequent additional polishing processes.

[0022] 3. This invention adopts a universal joint drive adapter, which can compensate for the installation deviation and motion angle deviation between the servo motor and the milling cutter, ensuring stable power transmission; the structure combining hydraulic drive and mechanical limit enables smooth and controllable switching of the milling cutter state; the polishing fluid has the functions of lubrication, cooling and polishing, which can reduce milling cutter wear, remove cutting chips, reduce the risk of channel blockage, extend the service life of equipment and ensure processing stability.

[0023] 4. This invention achieves intelligent guidance of lubricating oil under different speed conditions by designing lubricating oil holes with specific arc-shaped inner walls: at low and medium speeds, a directional and stable laminar oil film is formed to ensure precise lubrication, effective heat dissipation, and buffering and noise reduction; at high speeds, it transforms into a mixed form of turbulent flow and high-pressure injection with a wider coverage and stronger penetration, which significantly enhances the lubrication strength and heat dissipation efficiency of the core contact area, and also has a self-cleaning function. Thus, it comprehensively solves the problems of lubrication blind spots, uneven oil film, and high-speed lubrication failure in traditional round hole oil circuits, and greatly improves the reliability, durability, and overall smoothness of engine operation of the cam-rocker arm friction pair. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the punching mechanism of the present invention.

[0025] Figure 2 This is a cross-sectional schematic diagram of the punching mechanism structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the overall structure of the punching equipment of the present invention.

[0027] Figure 4 This is a schematic cross-sectional view of the first milling cutter structure of the present invention. Figure 1 .

[0028] Figure 5 This is a schematic cross-sectional view of the first milling cutter structure of the present invention. Figure 2 .

[0029] Figure 6 This is a cross-sectional schematic diagram of the first milling cutter structure of the present invention, to show the internal structure of the first milling cutter.

[0030] Figure 7 This is a three-dimensional exploded view of the punching mechanism of the present invention.

[0031] Figure 8 This is a schematic cross-sectional view of the lubrication assembly of the present invention.

[0032] Figure 9 This is a schematic diagram of the first milling cutter of the present invention in use.

[0033] Figure 10 This is a schematic diagram of the combined use state of the first milling cutter of the present invention.

[0034] Figure 11 This is a three-dimensional structural diagram of the limiting component of the present invention.

[0035] Figure 12 This is a schematic cross-sectional view of the cam plate body of the present invention.

[0036] Figure 13 This is a schematic diagram of the engine structure of the present invention, showing the three-dimensional structure of the cam body.

[0037] Figure 14 This is a schematic diagram of the exhaust camshaft structure of the present invention, showing the three-dimensional structure of the cam body.

[0038] The following are the labeling instructions in the diagram: 1. Cam body; 11. Shaft hole; 2. Engine; 21. Exhaust camshaft; 3. Oil hole; 31. Arc-shaped inner wall; 4. Punching machine tool; 5. Linear motion module; 6. Template; 7. Punching mechanism; 71. Hydraulic module; 72. Fixing frame; 73. Punching support plate; 74. Electric push rod; 75. Servo motor; 76. First milling cutter; 761. Annular groove; 762. Limiting ring; 763. Hydraulic channel; 77. Second milling cutter; 78. Movable rod; 79. Sealing cap; 710. Universal joint; 8. Limiting assembly; 81. Limiting frame; 82. Limiting rail; 83. Arc-shaped slide rail; 84. Transmission frame; 85. Telescopic rod; 9. Lubrication assembly; 91. Annular frame; 92. Sealing cover; 93. Hose; 94. Valve plate; 95. Conical spring; 96. Fluid channel. Detailed Implementation

[0039] Example 1, such as Figures 1-10 As shown, the present invention relates to a self-adjusting punching device for exhaust cam plates, comprising a punching machine 4, a linear motion module 5 and a template 6 arranged on the top left side of the punching machine 4, a punching mechanism 7 arranged on the top right side of the punching machine 4, a limiting component 8 and a lubrication component 9.

[0040] The linear motion module 5 is guided by a linear slide rail, and is matched with a driving motor, a ball screw (or a synchronous belt) and other driving components to realize high-precision linear motion and positioning of the template 6. The linear motion module 5 is widely used in the precise displacement field of automatic equipment and has the integrated functions of guiding, driving and positioning. The template 6 is installed on the slide rail and can slide and be accurately positioned.

[0041] The punching mechanism 7 comprises a hydraulic module 71 fixedly arranged on the top of the punching machine tool 4. The output end of the hydraulic module 71 is fixedly connected with a fixed frame 72. The fixed frame 72 is slidably connected with a punching support plate 73 inside. The limiting rod inside the fixed frame 72 penetrates through the hole on the punching support plate 73. The top of the punching support plate 73 is fixedly connected with an electric push rod 74. The top of the punching support plate 73 is slidably connected with a servo motor 75 with a protective frame. The output end of the electric push rod 74 is fixedly connected with the protective frame on the servo motor 75. The output shaft of the servo motor 75 is drivingly connected with a first milling cutter 76 and a second milling cutter 77. The end surface of the first milling cutter 76 is provided with an annular groove 761. The first milling cutter 76 is symmetrically connected with a limiting ring 762 with a protrusion on the inner wall. Two hydraulic ducts 763 are arranged at one end of the first milling cutter 76. The output ends of the hydraulic ducts 763 are in communication with the inside of the first milling cutter 76. The inside of each limiting ring 762 is slidably connected with a movable rod 78 with a groove on the inner wall. The one end of each movable rod 78 is fixedly connected with a sealing cap 79. The sealing cap 79 is slidably and sealingly connected in the inside of the first milling cutter 76. The output ends of the hydraulic ducts 763 are located between the two sealing caps 79. The one end of each movable rod 78 is movably connected with a universal shaft 710. One of the universal shafts 710 is drivingly connected with the output shaft of the servo motor 75. The other universal shaft 710 is drivingly connected with the second milling cutter 77.

[0042] It is worth noting that the universal shaft 710 is a cross shaft type universal coupling, which is a conventional technology and will not be described in detail here.

[0043] It is worth noting that the hydraulic module 71 is a conventional technology and will not be described in detail here. It is composed of a bracket fixedly connected to the top of the punching machine tool 4 and a hydraulic rod fixedly arranged in the bracket, which is used to punch the depth of the oil hole 3 and the curvature of the arc-shaped inner wall 31 on the cam piece body 1.

[0044] Specifically, the hydraulic pressure inside the first milling cutter 76 increases or decreases as the polishing fluid is supplied or withdrawn through the hydraulic channel 763, causing the two movable rods 78 to move towards or away from each other via the sealing cap 79. When moving towards each other, the first milling cutter 76 and the second milling cutter 77 merge to form a complete milling cutter, and the first milling cutter 76 is fixed on the output shaft of the servo motor 75. The servo motor 75 can drive the complete milling cutter to punch straight round holes. When moving away from each other, the first milling cutter 76 is hinged to the output shaft of the servo motor 75 and to the second milling cutter 77 and driven by the universal joint 710. With the cooperation of the lateral and vertical movement of the servo motor 75, the first milling cutter 76 rotates around its center point, and the first milling cutter 76 rotates on its own axis to punch the arc-shaped inner wall 31. When the first milling cutter 76 rotates around its center point, the second milling cutter 77 reciprocates in the straight hole on the cam body 1, and polishing fluid is used to polish its inner wall.

[0045] This invention uses a hydraulically controlled movable rod 78 to drive the milling cutter to merge or separate, which can not only complete the rapid punching of straight round holes, but also precisely cut the arc-shaped inner wall 31 through the cooperation of the translation of the servo motor 75 and the tilting rotation of the milling cutter. Without the need to change special tooling or equipment, it realizes the integrated processing of the exhaust cam plate oil hole 3 from the round hole to the arc-shaped inner wall 31, which greatly improves the processing efficiency and process continuity.

[0046] like Figure 1 and Figure 11 As shown, the limiting component 8 includes a limiting frame 81, which is fixedly connected to one side of the protective frame on the servo motor 75. A limiting track 82 is provided on the lower surface of the limiting frame 81. The limiting track 82 is composed of a straight track and an arc track, and the straight track and the arc track are connected. An arc slide rail 83 is slidably adapted to the inside of the limiting track 82 through a protrusion. The protrusion on the arc slide rail 83 passes through the limiting frame 81. A transmission frame 84 is slidably adapted to the bottom of the arc slide rail 83, and the transmission frame 84 is sleeved inside the annular groove 761. A telescopic rod 85 is rotatably connected to the top of the limiting frame 81. The output end of the telescopic rod 85 is hinged to the protrusion on the arc slide rail 83.

[0047] During milling operations, the limiting component 8 precisely limits the tilting and rotation trajectory of the milling cutter through the cooperation of the arc-shaped slide rail 83 and the limiting track 82, ensuring the curvature accuracy of the arc-shaped inner wall 31. At the same time, the lubrication component 9 synchronously delivers polishing fluid, which, in conjunction with the milling cutter cutting and the reciprocating movement of the second milling cutter 77, grinds and polishes the hole wall in real time, effectively reducing burrs and scratches, improving the smoothness of the inner wall of the oil hole 3, and avoiding subsequent additional polishing processes.

[0048] like Figure 4 and Figures 7-8As shown, the lubricating assembly 9 comprises an annular frame 91 fixedly arranged at one end of the first milling cutter 76 and in communication with the hydraulic channel 763, the annular frame 91 is sealingly rotatably provided with a sealing cover 92 on the side surface, and the sealing cover 92 is fixedly connected with a hose 93; one side inner wall of one of the sealing caps 79 is slidingly provided with a valve plate 94 through a plug rod, and the plug rod end on the valve plate 94 is in movable contact with one side of the limiting ring 762, and the plug rod surface on the valve plate 94 is sleeved with a conical spring 95; one end of one of the movable rods 78 is provided with a liquid flow channel 96, and the liquid flow channel 96 is in communication with the sealing cap 79.

[0049] Specifically, when the two movable rods 78 move in opposite directions, the sealing cap 79 moves to the extreme point, the plug rod on the valve plate 94 is in movable contact with one side of the limiting ring 762, the valve plate 94 is pushed open, the liquid flows out of the channel, and the liquid flows into the oil hole 3 from the channel, and is polished on the hole wall through the first milling cutter 76 and the second milling cutter 77.

[0050] The application adopts the universal shaft 710 transmission fitting, which can compensate the installation deviation and motion angle deviation between the servo motor 75 and the milling cutter, and ensure stable power transmission; the structure combining hydraulic drive and mechanical limiting realizes stable and controllable switching of the milling cutter state; the polishing liquid has the functions of lubrication, cooling and polishing, which can not only reduce the milling cutter wear, but also carry away the cutting debris, reduce the risk of hole blockage, prolong the service life of the equipment and ensure the machining stability.

[0051] Embodiment 2, as Figures 12-14 As shown, the exhaust cam piece of the application comprises a cam piece body 1, the cam piece body 1 is installed and fitted on the exhaust camshaft 21 inside the engine 2, the cam piece body 1 is provided with a shaft hole 11 on one side, the shaft hole 11 is matched with the side surface of the exhaust camshaft 21, the side surface of the cam piece body 1 is provided with an oil hole 3, and the oil hole 3 is arranged with an arc-shaped inner wall 31.

[0052] It is worth noting that the engine 2 is a prior art and will not be described in detail here; the shaft hole 11 and the exhaust camshaft 21 are fixedly connected through the circumferential positioning structure to limit the circumferential displacement of the cam piece body 1 relative to the exhaust camshaft 21, so that the cam piece body 1 rotates synchronously with the exhaust camshaft 21; the exhaust camshaft 21 is drivingly connected with the crankshaft of the engine 2 through a timing transmission assembly (such as a timing chain, a timing gear or a timing belt), when the crankshaft rotates, the exhaust camshaft 21 is driven and drives the cam piece body 1 to rotate around its axis, and the cam profile of the cam piece body 1 controls the opening and closing time and stroke of the exhaust valve through contact with the exhaust valve rocker arm.

[0053] Specifically, when the cam piece body 1 rotates at a low speed, the lubricating oil flows out through the oil hole 3 and forms a stable laminar flow and directional arc-shaped jet under the guidance of the arc-shaped inner wall 31, accurately covering the contact area of the cam and the exhaust valve rocker arm, forming a continuous and uniform oil film, effectively reducing boundary friction and reducing the wear of the cam and the rocker arm, ensuring the reliability of the valve train under low-speed working conditions. At the same time, the smooth oil flow continuously carries away the friction heat, avoiding local overheating of the cam, and the continuous oil film can buffer metal impact, reduce the mechanical noise of the valve train, and improve the smoothness of the engine 2 operation; when rotating at high speed, the lubricating oil under the joint action of the arc-shaped inner wall 31 and centrifugal force presents a mixed form of turbulent splash and high-pressure arc-shaped jet, which strengthens the lubrication strength of the high-frequency contact area of the cam, and avoids the peeling of the cam and the wear of the rocker arm due to insufficient lubrication. The heat dissipation efficiency of the high-speed flowing oil is greatly improved, effectively inhibiting the accumulation of a large amount of heat generated by the high-speed rotation of the cam; in addition, the high-speed oil flow can also flush the carbon and impurities in the oil hole 3 and the oil passage, keep the lubrication system unobstructed, reduce the risk of failure caused by oil passage blockage, and solve the problem of existing circular hole-shaped path oil flow without directional guidance, which is easy to disperse and cause lubrication blind area. At low speed, the oil film uniformity is poor, and it is easy to be locally too thin or broken; at high speed, the oil flow direction is chaotic, the lubrication strength of the core friction area is insufficient, and it is easy to "separate" from the surface of the cam.

[0054] Working principle: the embodiment provides an exhaust cam piece and a self-adjusting punching equipment thereof. The cam piece body 1 is first placed on the template 6 to fix it, then the hydraulic module 71 is driven to translate the fixed frame 72 through the external control system, the second milling cutter 77 corresponds to the punching position of the side surface of the cam piece body 1, then the internal polishing liquid of the first milling cutter 76 is removed, the two movable rods 78 move towards each other, the servo motor 75 output shaft, the first milling cutter 76 and the second milling cutter 77 form a complete milling cutter, and then the external circuit mechanism drives the servo motor 75 to drive the milling cutter to punch the side surface of the cam piece body 1, and the hole is in the form of a circular hole.

[0055] In the cutting arc-shaped inner wall 31, first, the first milling cutter 76 is filled with polishing liquid through the external control system through the hose 93, at this time, the hydraulic pressure in the first milling cutter 76 increases, so that the two movable rods 78 move in opposite directions, causing the first milling cutter 76, the second milling cutter 77 and the output shaft of the servo motor 75 to separate, at the same time, the transmission frame 84 moves, driving the arc-shaped slide rail 83 to move to the arc-shaped track in the limiting rail 82, then the external circuit mechanism makes the servo motor 75 drive the first milling cutter 76, through the universal shaft 710 and other transmission, drives the second milling cutter 77 to rotate, and cooperates with the two-dimensional translation mechanism to make the servo motor 75 translate left and right, forward and backward, wherein the servo motor 75 exerts an inclined force on the first milling cutter 76 when moving, the first milling cutter 76 is limited in the arc-shaped track in the arc-shaped slide rail 83 and the limiting rail 82, so that the first milling cutter 76 can rotate around the central point axis, and cooperates with the driving of the servo motor 75 to cut the inner wall of the circular hole, so that the cutting work of the arc-shaped inner wall 31 can be completed.

[0056] When the first milling cutter 76, the second milling cutter 77 and the output shaft of the servo motor 75 work separately, the plug rod end of the valve plate 94 is in movable contact with the limiting ring 762, so that the valve plate 94 moves to one side, the polishing liquid flows from the channel between the valve plate 94 and the sealing cap 79 into the liquid flow channel 96, and then flows to the inside of the circular hole from between the first milling cutter 76 and the second milling cutter 77, and when the first milling cutter 76 rotates around the central point, the polishing liquid is extruded into the circular hole and the arc-shaped inner wall 31, and cooperates with the reciprocating movement of the second milling cutter 77 in the circular hole, so that the circular hole and the arc-shaped inner wall 31 can be polished.

[0057] The embodiments of the present application are disclosed, but are not limited to this, those skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, they are within the protection scope of the present application.

Claims

1. A self-adjusting punching device for exhaust cam plates, characterized in that, It includes a punching machine (4), a linear motion module (5) arranged on the top of the punching machine (4), a template (6), a punching mechanism (7), a limiting component (8), and a lubrication component (9); The punching mechanism (7) includes a servo motor (75) capable of lateral or longitudinal translation. The servo motor (75) is capable of bidirectional translation, both left and right and forward and backward. The output shaft of the servo motor (75) is adapted to a first milling cutter (76) and a second milling cutter (77). The first milling cutter (76) has movable rods (78) at both ends that are capable of moving towards or away from each other. Both movable rods (78) are adapted to the second milling cutter (77) and the output shaft of the servo motor (75) through a universal joint (710). The end surface of the first milling cutter (76) is provided with an annular groove (761). The inside of the first milling cutter (76) is symmetrically structured and fitted with a limiting ring (762) with protrusions on the inner wall. Two hydraulic channels (763) are provided at one end of the first milling cutter (76), and the output end of the hydraulic channel (763) is connected to the inside of the first milling cutter (76). The movable rod (78) is slidably adapted to the inside of the limiting ring (762). One end of each of the two movable rods (78) is fixedly connected to a sealing cap (79), and the sealing cap (79) is slidably adapted to the inside of the first milling cutter (76). The output end of the hydraulic channel (763) is located between the two sealing caps (79). The universal joint (710) is movably connected to one end of the movable rod (78). When the two movable rods (78) move toward each other, the first milling cutter (76), the second milling cutter (77) and the output shaft of the servo motor (75) combine to form a complete milling cutter, and the servo motor (75) can drive the milling cutter to punch straight round holes; when the two movable rods (78) move in opposite directions, the first milling cutter (76) and the output shaft of the servo motor (75), and the first milling cutter (76) and the second milling cutter (77) are all hinged and driven by the universal joint (710). Through the cooperation of the servo motor (75) and the two-dimensional translation mechanism, the first milling cutter (76) rotates around the center point of the first milling cutter (76) and the motor drives the first milling cutter (76) to rotate, which can punch the arc-shaped inner wall (31); As the first milling cutter (76) rotates around its center point, the second milling cutter (77) reciprocates within the straight hole on the cam body (1), and polishes its inner wall with polishing fluid.

2. The exhaust cam self-adjusting punching device according to claim 1, characterized in that, The punching mechanism (7) also includes a hydraulic module (71), which is fixedly arranged on the top of the punching machine (4). The output end of the hydraulic module (71) is fixedly connected to a fixed frame (72). A punching support plate (73) is slidably connected inside the fixed frame (72), and a limiting rod inside the fixed frame (72) passes through a hole on the punching support plate (73). An electric push rod (74) is fixedly connected to the top of the punching support plate (73). The protective frame on the servo motor (75) is slidably adapted to the top of the punching support plate (73), and the output end of the electric push rod (74) is fixedly connected to the protective frame on the servo motor (75).

3. The exhaust cam self-adjusting punching device according to claim 2, characterized in that, The limiting component (8) includes a limiting frame (81), which is fixedly connected to one side of the protective frame on the servo motor (75). A limiting track (82) is provided on the lower surface of the limiting frame (81). The limiting track (82) is composed of a straight track and an arc track, and the straight track and the arc track are connected.

4. The exhaust cam self-adjusting punching device according to claim 3, characterized in that, The limiting track (82) is fitted with an arc-shaped slide rail (83) through a protrusion, and the protrusion on the arc-shaped slide rail (83) passes through the limiting frame (81). The bottom of the arc-shaped slide rail (83) is fitted with a transmission frame (84), and the transmission frame (84) is sleeved inside the annular groove (761). The top of the limiting frame (81) is rotatably connected to a telescopic rod (85), and the output end of the telescopic rod (85) is hinged to the protrusion on the arc-shaped slide rail (83).

5. The exhaust cam self-adjusting punching device according to claim 4, characterized in that, The lubrication assembly (9) includes an annular frame (91), which is fixedly arranged at one end of the first milling cutter (76) and is connected to the hydraulic channel (763). The side surface of the annular frame (91) is fitted with a sealing cover (92), and the surface of the sealing cover (92) is fixedly connected to a hose (93).

6. The exhaust cam self-adjusting punching device according to claim 5, characterized in that, One of the sealing caps (79) has a valve plate (94) slidably fitted on one side of its inner wall via a plug rod, and the end of the plug rod on the valve plate (94) is in active contact with one side of the limiting ring (762).

7. The exhaust cam self-adjusting punching device according to claim 6, characterized in that, A conical spring (95) is fitted on the surface of the insert rod on the valve plate (94), and one of the movable rods (78) has a liquid flow channel (96) at one end, and the liquid flow channel (96) is connected to the sealing cap (79).

8. An exhaust cam plate manufactured by the self-adjusting punching device according to claim 7, characterized in that, Includes a cam body (1), which is mounted on an exhaust camshaft (21) inside an engine (2). A shaft hole (11) is provided on one side of the cam body (1), and the shaft hole (11) is adapted to the side surface of the exhaust camshaft (21). The cam body (1) has an oil hole (3) on its side surface, and the oil hole (3) has an arc-shaped inner wall (31) inside. When the cam body (1) rotates at low speed, the oil flow is guided by the arc-shaped inner wall (31) to form a stable laminar flow and directional injection, which can lubricate the contact area between the cam and the rocker arm; when the cam body (1) rotates at high speed, the arc-shaped inner wall (31) and centrifugal force work together to make the oil flow turbulent splash and high pressure injection.

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