A supercharger oil return pipe assembly and preparation method thereof

Abstract

The present invention provides a supercharger oil return pipe assembly and a preparation method thereof, which relates to the technical field of oil pipes, and includes an oil return pipe body, the oil return pipe body includes a bent bellows and two connecting pipes, each wave crest outer wall of the bent bellows is fixed with a plug-in block, a shaping structure is arranged on the outer side of the bent bellows, and the shaping structure includes a shaping ratchet bar and a plurality of elastic clips; one end of the shaping ratchet bar is fixedly connected to the outer wall of the bent bellows, and the other end passes through the notches of each plug-in block in sequence; the elastic clip is fixed in the notch of the plug-in block and meshes with the shaping ratchet bar, each plug-in block is provided with a locking piece, and the elastic clip is relatively fixed to the shaping ratchet bar through the locking piece. The present invention ensures the stability of the oil return pipe assembly in the working state, reduces the vibration and deformation of the bent bellows caused by the operation of the engine, prolongs the fatigue cracking life of the oil return pipe assembly, and improves the connection stability and sealing at the interface, and improves the problem of oil leakage at the interface.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipes, and in particular to a supercharger oil return pipe assembly and a preparation method thereof. Background Art

[0002] The supercharger oil return pipe assembly is used on gasoline or diesel engines with turbochargers to connect the supercharger to the engine crankcase and smoothly guide the oil that lubricates the supercharger bearings into the oil pan of the engine crankcase.

[0003] Existing supercharger oil return pipes are mostly made of metal bellows, and metal connecting pipes are welded or integrally connected at both ends of the metal bellows, and the connecting pipes are connected to the interfaces of the supercharger and the crankcase to achieve oil circuit connectivity. When in use, the metal bellows can be bent and deformed to facilitate changing the axial shape of the oil return pipe, so as to better adapt to different installation spaces, prevent installation interference, and improve connection convenience.

[0004] In view of the above-mentioned prior art, the inventor believes that the engine will transmit vibration to the oil return pipe when running. Since the metal bellows itself is easy to bend and deform, it is more obviously affected by the vibration, which can easily cause vibration and deformation of the metal bellows at the bend, reducing the fatigue life of the metal bellows at the bend, and easily causing the interface connection to loosen and leak oil. Summary of the invention

[0005] In order to improve the stability of the oil return pipe assembly in a working state, reduce the vibration and deformation of the bent bellows caused by engine operation, extend the fatigue cracking life of the oil return pipe assembly, and improve the connection stability and sealing at the interface, the present invention provides a supercharger oil return pipe assembly and a preparation method thereof.

[0006] In order to solve the above technical problems, the present invention provides a supercharger oil return pipe assembly, including an oil return pipe body, the oil return pipe body including a bent corrugated pipe and two connecting pipes for connecting with a supercharger or a crankcase, the two connecting pipes are respectively connected to the two ends of the bent corrugated pipe; a plug-in block is fixed to the outer wall of each crest of the bent corrugated pipe, and a notch is provided on the plug-in block; a shaping structure is arranged on the outer side of the bent corrugated pipe, and the shaping structure includes a shaping ratchet bar and a plurality of elastic teeth;

[0007] The shaped ratchet bar is made of plastic metal, one end of which is fixedly connected to the outer wall of one end of the bent corrugated pipe, and the other end passes through the notches of each plug-in block in sequence;

[0008] The elastic teeth correspond to the plug-in blocks one by one, the elastic teeth are fixed in the notches of the plug-in blocks, the elastic teeth are meshed with the teeth of the shaping ratchet bar, and the elastic teeth can be elastically deformed in a direction away from the shaping ratchet bar;

[0009] A locking piece is arranged on each of the plug-in blocks, and the elastic locking teeth are relatively fixed to the shaped ratchet bar through the locking piece.

[0010] Furthermore, the elastic latch includes a U-shaped plate and a tooth block, the U-shaped plate is composed of a base plate and two side plates integrally connected to the base plate, one of the side plates is fixedly connected to the inner wall of the bending corrugated tube away from the groove, and the tooth block is fixed to one end of the other side plate away from the base plate, and the tooth block can engage with the tooth groove of the shaped ratchet bar.

[0011] Furthermore, the locking member adopts a locking bolt, which is inserted into the plug-in block and threadedly connected to the plug-in block. One end of the locking bolt penetrates the plug-in block and passes through the side plate connected to the plug-in block, and can abut against the side plate connected to the tooth block.

[0012] Furthermore, the bending bellows and the connecting pipe are separately arranged, the two connecting pipes are detachably connected to the bending bellows, and the connecting pipe is rotatably connected to the bending bellows.

[0013] Furthermore, the connecting pipe includes a telescopic bellows section and a first connecting pipe and a second connecting pipe integrally formed at both ends of the telescopic bellows section, an interface is provided on the supercharger and the crankcase, an outer circumferential surface of the end of the first connecting pipe away from the telescopic bellows section is formed with an external thread, the first connecting pipe is inserted into the interface and is threadedly connected to the inner wall of the interface through the external thread; a retaining ring is fixed to the outer circumferential surface of the first connecting pipe, an external connecting pipe is coaxially sleeved outside the first connecting pipe, the external connecting pipe is movably connected to the first connecting pipe, the retaining ring is located in the external connecting pipe, a sealing plate is provided at one end of the external connecting pipe, the sealing plate abuts against the retaining ring, an internal thread is formed on the inner circumferential surface of the external connecting pipe, the external connecting pipe is threadedly connected to the outer wall of the interface through the internal thread, and the external thread and the internal thread have opposite rotation directions.

[0014] Furthermore, the telescopic bellows section is provided with fixing blocks on the outer walls of the wave crests at both ends thereof, a connecting rod is passed between the two fixing blocks, both ends of the connecting rod pass through adjacent fixing blocks, locking nuts are provided on both sides of each fixing block, the locking nuts are sleeved on the connecting rod and threadedly connected to the connecting rod, and the locking nuts abut against the side walls of the adjacent fixing blocks.

[0015] Furthermore, straight pipe portions are integrally formed at both ends of the bent bellows, an arc-shaped bottom plate is fixed to the end of the second connecting pipe away from the telescopic bellows section, an arc-shaped cover plate adapted to the arc-shaped bottom plate is detachably connected to the arc-shaped bottom plate, and a connecting channel for inserting the straight pipe portion is formed between the arc-shaped cover plate and the arc-shaped bottom plate; an anti-slip ring and a positioning ring are coaxially arranged on the outer circumferential surface of the straight pipe portion, the positioning ring is located on the side of the anti-slip ring away from the bent bellows, and a retaining ring is fixed to the inner wall of the connecting channel; when the connecting pipe section is inserted into the connecting channel, the positioning ring and the anti-slip ring are respectively located at both ends of the retaining ring.

[0016] Furthermore, a sleeve is provided between the positioning ring and the anti-slip ring, the sleeve is sleeved outside the straight tube portion, a rotating spherical surface is formed on the outer wall of the sleeve, and a spherical groove adapted to the rotating spherical surface of the sleeve is formed on the inner wall of the retaining ring.

[0017] Furthermore, a groove is provided on the inner wall of the second connecting pipe near the anti-slip ring, the groove is filled with a felt ring, the anti-slip ring is tightly fitted against the inner wall of the felt ring, and a slope is formed on the side wall of the anti-slip ring near the retaining ring, and a plurality of wire grooves are provided on the slope.

[0018] The present invention also provides a method for preparing a supercharger oil return pipe, comprising the following steps:

[0019] S1: Preliminary forming of the connecting pipe and the bent bellows: Select a metal pipe of a set size as the connecting pipe base material and the bent bellows base material, place each metal pipe in the corresponding connecting pipe mold and the bent bellows mold, and the position of the metal pipe to be processed into a corrugated section corresponds to the corrugated mold of the mold. Then, high-pressure liquid is poured into each mold, and the metal pipe is horizontally extruded into the set corrugation by using a hydraulic forming process to complete the preliminary forming of the connecting pipe and the bent bellows;

[0020] S2: Welding and forming of the bent corrugated pipe: welding a plug-in block on the outer wall of the crest of the bent corrugated pipe, and welding an elastic clamping tooth in the notch of the plug-in block, passing the shaping ratchet bar through each notch, and then welding one end of the shaping ratchet bar to the bent corrugated pipe; after welding the positioning ring outside the straight pipe part, the sleeve is set on the straight pipe part, and then the anti-slip ring is welded on the straight pipe part;

[0021] S3: Welding and forming the connecting pipe: welding an arc bottom plate on the end face of the first connecting pipe; sleeve the outer connecting pipe outside the second connecting pipe, and then weld a retaining ring on the outer wall of the second connecting pipe;

[0022] S4: Assembly between the connecting pipe and the bent bellows: Place the straight pipe part of the bent bellows on the arc bottom plate, make the positioning ring and the anti-drop ring located at both ends of the retaining ring, connect the arc cover plate and the arc bottom plate together and fix them with bolts to complete the assembly between the connecting pipe and the bent bellows.

[0023] Beneficial effects of the present invention:

[0024] 1. A supercharger oil return pipe assembly of the present invention is provided with a shaping structure on the outer arc side of the bending direction of the bent bellows, which can ensure the stability of the bent bellows when the oil return pipe assembly is in a working state, reduce the vibration and deformation of the bent bellows caused by the operation of the engine, and then effectively extend the fatigue cracking life of the bent bellows, and improve the connection stability of the interface between the oil return pipe assembly and the supercharger and the crankcase, thereby improving the problem of oil leakage at the interface.

[0025] 2. When the connecting pipe is connected to the interface of the supercharger or the crankcase, the first connecting pipe is first rotated and screwed into the interface through the external thread. The setting of the connecting pipe and the bent bellows being rotatably connected, combined with the setting of the telescopic deformation of the telescopic bellows section, can ensure that the first connecting pipe will not affect the orientation of the bent bellows during the connection process; and the threaded connection installation method is simpler; and then the external connecting pipe is threadedly connected to the outer wall of the interface through the internal thread. Since the external thread and the internal thread are rotated in opposite directions, the stability and firmness of the connection between the connecting pipe and the interface can be effectively improved, and it is not easy to fall off due to operation vibration, and the sealing effect at the interface is improved, reducing the possibility of oil leakage at the interface.

[0026] 3. The straight pipe part and the second connecting pipe are connected in rotation through the cooperation of the rotating spherical surface of the sleeve and the spherical groove of the retaining ring. It has better wear resistance and self-aligning function, which can improve the rotation obstacle caused by the axis error between the straight pipe part and the second connecting pipe, thereby ensuring the smooth realization of the functions such as the threaded connection of the connecting pipe and the interface and the control of the fixed structural orientation of the bent corrugated pipe.

[0027] 4. A felt ring is arranged in the connection structure to seal and reduce the possibility of oil leakage. At the same time, the felt ring has good oil absorption and absorbs the infiltrated oil. The friction coefficient between the felt ring that absorbs the oil and the corresponding anti-slip ring is smaller, making the relative rotation of the connecting pipe and the bent bellows smoother. The wire groove guides the infiltrated oil that cannot be absorbed by the felt ring to the junction of the rotating spherical surface and the spherical groove, which plays the role of a lubricant. While reducing wear, it further improves the convenience of relative rotation of the connecting pipe and the bent bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the structure of the bent corrugated tube in the present invention.

[0030] Figure 3 It is a partial cross-sectional view used to reflect the shaping structure in the present invention.

[0031] Figure 4 It is a structural schematic diagram of the connecting pipe in the present invention.

[0032] Figure 5 It is a structural explosion diagram of the connecting pipe in the present invention.

[0033] Figure 6 It is a partial cross-sectional view used to illustrate the first connecting pipe in the present invention.

[0034] Figure 7 It is a partial cross-sectional view used to reflect the connection structure in the present invention.

[0035] Figure 8 It is a structural schematic diagram of the straight pipe portion in the present invention.

[0036] In the figure: 1, bent bellows; 11, straight pipe; 111, anti-drop ring; 112, wire groove; 113, positioning ring; 114, sleeve; 115, rotating spherical surface; 2, connecting pipe; 21, telescopic bellows section; 211, fixing block; 212, connecting rod; 213, locking nut; 22, first connecting pipe; 221, retaining ring; 222, external connecting pipe; 223, external thread; 224, internal thread; 225, first sealing Gasket; 226, sealing plate; 23, second connecting pipe; 232, felt ring; 3, shaping structure; 31, shaping ratchet bar; 32, elastic tooth; 321, U-shaped plate; 322, bottom plate; 323, side plate; 324, tooth block; 33, locking bolt; 34, plug-in block; 341, notch; 4, connecting structure; 41, arc bottom plate; 42, arc cover plate; 43, blade plate; 44, retaining ring; 441, spherical groove. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0038] The invention discloses a supercharger oil return pipe assembly.

[0039] Reference Figure 1 A supercharger oil return pipe assembly includes an oil return pipe body, which includes a bent bellows 1 and two connecting pipes 2 for connecting to a supercharger or a crankcase, and interfaces connected to the connecting pipes 2 are correspondingly provided on the supercharger and the crankcase. The bent bellows 1 can be bent and deformed during use, which is convenient for changing the axial shape of the oil return pipe body to better adapt to different installation spaces, prevent installation interference, and improve the convenience of connecting the supercharger and the crankcase. The two connecting pipes 2 are separated from the bent bellows 1, and the two connecting pipes 2 are detachably connected to the two ends of the bent bellows 1. When damaged, the oil return pipe assembly can be partially maintained or replaced to reduce costs.

[0040] Reference Figures 1 to 3A shaping structure 3 is arranged on the outside of the bending bellows 1, and the shaping structure 3 includes a shaping ratchet bar 31 and a plurality of elastic teeth 32, wherein the shaping ratchet bar 31 is made of plastic metal, such as copper, aluminum, low carbon steel, etc. In this embodiment, the shaping ratchet bar 31 is made of aluminum metal, and the plate thickness of the shaping ratchet bar 31 is 2mm. A plug-in block 34 is welded and fixed to the outer wall of each crest of the bending bellows 1, and a notch 341 is provided on the plug-in block 34; one end of the shaping ratchet bar 31 is welded and fixed to the outer wall of one end of the bending bellows 1, and the other end passes through the notch 341 of each plug-in block 34 in sequence.

[0041] Reference Figures 1 to 3 The elastic teeth 32 correspond to the plug-in blocks 34 one by one. The elastic teeth 32 are fixed in the notch 341 of the plug-in blocks 34 and are located on the side of the shaping ratchet bar 31 away from the bending bellows 1. The elastic teeth 32 are made of spring steel as a whole. The elastic teeth 32 include a U-shaped plate 321 and a tooth block 324; the U-shaped plate 321 is composed of a bottom plate 322 and side plates 323 integrally connected to both sides of the bottom plate 322, wherein one side plate 323 is welded and fixed to the inner wall of the notch 341 away from the bending bellows 1, and the tooth block 324 is integrally formed at the end of the other side plate 323 away from the bottom plate 322, and the tooth block 324 is meshed with the tooth groove of the shaping ratchet bar 31. When the elastic teeth 32 are squeezed by external force, they can be elastically deformed in the direction away from the shaping ratchet bar 31. A locking piece is provided on each plug-in block 34, and the elastic teeth 32 are relatively fixed to the shaping ratchet bar 31 through the locking piece. The locking member adopts a locking bolt 33, which is inserted into the plug-in block 34 and threadedly connected to the plug-in block 34. One end of the locking bolt 33 inserted into the plug-in block 34 passes through the side plate 323 connected to the plug-in block 34 and abuts against the side plate 323 connected to the tooth block 324.

[0042] When the bending bellows 1 is bent for use, the operator needs to control the bending direction of the bending bellows 1 so that the shaping structure 3 is located on the outer arc side of the bending direction of the bending bellows 1, providing more operating space for subsequent locking and shaping; and then in the process of the bending bellows 1 being bent, the length of the shaping ratchet bar 31 between the two adjacent plug-in blocks 34 is in an increasing process, and the elastic tooth 32 is elastically deformed in the direction away from the shaping ratchet bar 31 under the ratchet abutment of the shaping ratchet bar 31, which will not hinder the relative displacement between the shaping ratchet bar 31 and the elastic tooth 32, and the shaping ratchet bar 31 can bend synchronously with the bending bellows 1 under the action of the plug-in block 34. When the bending curvature of the bent bellows 1 is completed, the locking bolt 33 is tightened to make the locking bolt 33 and the side plate 323 press against each other, and then the tooth block 324 is meshed and clamped with the shaping ratchet bar 31, so as to achieve relative fixation between the shaping ratchet bar 31 and the bent bellows 1, so that the bent bellows 1 is not prone to further bending inward. When the bent bellows 1 has a tendency to stretch outward, the locking piece locks the shaping ratchet bar 31 into several sections, which effectively increases the rigidity of the directional ratchet bar and can also effectively hinder the tendency of the bent bellows 1 to stretch outward, thereby producing a better shaping and stabilizing effect on the bent bellows 1.

[0043] The setting of the shaping structure 3 can ensure the stability of the bent bellows 1 when the oil return pipe assembly is in a working state, reduce the vibration and deformation of the bent bellows 1 caused by the operation of the engine, and then effectively extend the fatigue cracking life of the bent bellows 1, and improve the connection stability at the interface between the oil return pipe assembly and the supercharger and crankcase, and improve the problem of oil leakage at the interface.

[0044] In order to ensure that the operator can easily control the bending direction of the bent bellows 1 when in use and to make the shaping structure 3 located on the outer arc side of the bent bellows 1, the two ends of the bent bellows 1 are rotatably connected to the connecting pipe 2.

[0045] Reference Figures 4 to 6The connecting pipe 2 includes a telescopic bellows section 21 and a first connecting pipe 22 and a second connecting pipe 23 integrally formed at both ends of the telescopic bellows section 21. An external thread 223 is formed on the outer circumferential surface of one end of the first connecting pipe 22 away from the telescopic bellows section 21. The first connecting pipe 22 is inserted into the interface of the external connecting pipe 222 and connected with the internal thread at the interface of the external connecting pipe 222 through the external thread 223; a retaining ring 221 is fixed on the outer circumferential surface of the first connecting pipe 22, an external connecting pipe 222 is coaxially sleeved outside the first connecting pipe 22, the external connecting pipe 222 is movably connected with the first connecting pipe 22, the retaining ring 221 is located in the external connecting pipe 222, a sealing plate 226 is integrally formed at one end of the external connecting pipe 222, the sealing plate 226 abuts against the retaining ring 221, an internal thread 224 is formed on the inner circumferential surface of the external connecting pipe 222, the external connecting pipe 222 is connected with the external thread 223 at the interface of the first connecting pipe 22 through the internal thread 224, and the external thread 223 and the internal thread 224 rotate in opposite directions.

[0046] When the connecting pipe 2 is connected to the interface of the supercharger or crankcase, the first connecting pipe 22 is first rotated and screwed into the interface through the external thread 223. The above-mentioned setting of the connecting pipe 2 and the bending bellows 1 being rotatably connected, combined with the setting of the telescopic deformation of the telescopic bellows section 21, can also ensure that the first connecting pipe 22 will not affect the orientation of the bending bellows 1 during the connection process; and the threaded connection installation method is simpler. Afterwards, the external connecting pipe 222 is threadedly connected to the outer wall of the interface through the internal thread 224. Since the external thread 223 and the internal thread 224 rotate in opposite directions, the stability and firmness of the connection between the connecting pipe 2 and the interface can be effectively improved, and it is not easy to fall off due to operation vibration, and the sealing effect at the interface is improved, reducing the possibility of oil leakage at the interface.

[0047] Reference Figure 6 In order to further improve the sealing effect at the interface, a first sealing gasket 225 is bonded to a side wall of the retaining ring 221 away from the telescopic bellows, a backing plate (not shown in the figure) is welded to the outer wall of the interface, and a second sealing gasket (not shown in the figure) is bonded to the backing plate. When the first connecting pipe 22 and the external connecting pipe 222 are threadedly connected to the interface, the retaining ring 221 abuts against the end face of the interface through the first sealing gasket 225, and the external connecting pipe 222 abuts against the backing plate through the second sealing gasket.

[0048] In some embodiments, the end surface of the first connecting pipe 22 may also be connected to a flange, and connected to the interface of the supercharger and the crankcase through the flange.

[0049] Reference Figure 4In order to prevent the vibration and deformation of the telescopic bellows section 21 caused by the operation of the engine, a fixing block 211 is welded to the outer wall of the wave crest at both ends of the telescopic bellows section 21, and a connecting rod 212 is inserted between the two fixing blocks 211. The two ends of the connecting rod 212 pass through the adjacent fixing blocks 211. Locking nuts 213 are arranged on both sides of each fixing block 211. The locking nuts 213 are sleeved on the connecting rod 212 and threadedly connected with the connecting rod 212. When the connection pipe 2 is connected to the supercharger or crankcase, the locking nuts 213 on both sides of the fixing block 211 are tightened so that the locking nuts 213 are pressed against the two side walls of the corresponding fixing block 211, thereby achieving the finalization and stabilization of the telescopic bellows section 21, and reducing the possibility of loose connection and oil leakage at the interface.

[0050] Reference Figure 5 , Figure 7 and Figure 8 A connecting structure 4 is provided between the bent bellows 1 and the connecting pipe 2, and the connecting structure 4 includes an arc bottom plate 41 and an arc cover plate 42 that are adapted to each other. In this embodiment, the cross-sectional shapes of the arc bottom plate 41 and the arc cover plate 42 are both semicircular. The two ends of the bent bellows 1 are integrally formed with a straight pipe portion 11, and the arc bottom plate 41 is coaxially welded to the end surface of the second connecting pipe 23 away from the telescopic bellows section 21. The arc cover plate 42 and the arc bottom plate 41 are fixed with blades 43 on both sides of the arc length direction. When the arc cover plate 42 and the arc bottom plate 41 are buckled, a connecting channel for the straight pipe portion 11 to be inserted can be formed; when the arc cover plate 42 and the arc bottom plate 41 are connected and fixed, bolts are passed through the two blades 43, and the arc cover plate 42 and the arc bottom plate 41 are detachably connected by bolts.

[0051] Reference Figure 5 , Figure 7 and Figure 8 The outer circumferential surface of the straight tube portion 11 is coaxially provided with an anti-slip ring 111 and a positioning ring 113. The positioning ring 113 and the anti-slip ring 111 are both welded and fixed to the straight tube portion 11. The positioning ring 113 is located on the side of the anti-slip ring 111 away from the bent corrugated tube 1. The inner wall of the connecting channel is integrally connected with a retaining ring 44. The outer wall of the retaining ring 44 cooperates with the inner wall of the arc-shaped cover plate 42 and the inner wall of the arc-shaped bottom plate 41 respectively. When the connecting tube 2 section is inserted into the connecting channel, the positioning ring 113 and the anti-slip ring 111 are respectively located at both ends of the retaining ring 44. The anti-slip ring 111 plays a role in preventing the bent corrugated tube 1 from being separated from the connecting tube 2. The positioning ring 113 can prevent the bent corrugated tube 1 from continuing to move into the inside of the connecting tube 2, and cooperates with the anti-slip ring 111 and the retaining ring 44 to achieve the effect of connection positioning, thereby improving the connection stability and convenience.

[0052] Reference Figure 5 , Figure 7 and Figure 8A sleeve 114 is arranged between the positioning ring 113 and the anti-slip ring 111. The sleeve 114 is rotatably sleeved outside the straight pipe part 11. A rotating spherical surface 115 is formed on the outer wall of the sleeve 114. The center of the rotating spherical surface 115 is located on the axis of the straight pipe part 11. A spherical groove 441 adapted to the rotating spherical surface 115 of the sleeve 114 is formed on the inner wall of the retaining ring 44. Therefore, the straight pipe part 11 and the second connecting pipe 23 are rotatably connected through the cooperation of the rotating spherical surface 115 of the sleeve 114 and the spherical groove 441 of the retaining ring 44. The wear-resistant effect is better, and the self-aligning function can be provided. The rotation obstacle caused by the axis error between the straight pipe part 11 and the second connecting pipe 23 can be improved, thereby ensuring the smooth realization of the functions of connecting the above-mentioned connecting pipe 2 with the interface and controlling the orientation of the shaping structure 3 of the bent corrugated pipe 1.

[0053] Reference Figure 5 , Figure 7 and Figure 8 The inner wall of the second connecting pipe 23 near the anti-slip ring 111 is provided with a groove, and the groove is filled with a felt ring 232. The anti-slip ring 111 and the inner wall of the felt ring 232 are tightly fitted, and the side wall of the anti-slip ring 111 near the retaining ring 44 is formed with an inclined surface, and a plurality of wire grooves 112 are provided on the inclined surface. The felt ring 232 has a sealing effect, which can reduce the possibility of oil leakage. At the same time, the felt ring 232 also has good oil absorption, and absorbs the infiltrated oil. The friction coefficient between the felt ring 232 that absorbs the oil and the corresponding anti-slip ring 111 is smaller, so that the relative rotation of the connecting pipe 2 and the bending bellows 1 is smoother; and the setting of the wire groove 112 can guide the infiltrated oil that the felt ring 232 cannot absorb into the junction of the rotating spherical surface 115 and the spherical groove 441, which plays the role of a lubricant, while reducing wear, further improving the convenience of relative rotation of the connecting pipe 2 and the bending bellows 1.

[0054] The invention also discloses a method for preparing the supercharger oil return pipe assembly.

[0055] The preparation method of the supercharger oil return pipe assembly comprises the following steps:

[0056] S1: Preliminary forming of the connecting tube 2 and the bent bellows 1: Select a metal tube of a set size as the connecting tube substrate and the bent bellows substrate, place each metal tube in a corresponding connecting tube mold and a bent bellows mold, and the position of the metal tube to be processed into a corrugated section corresponds to the corrugated mold of the mold. Then, high-pressure liquid is poured into each mold, and the metal tube is horizontally extruded into the set corrugation by a hydraulic forming process to complete the preliminary forming of the connecting tube 2 and the bent bellows 1;

[0057] S2: Welding and forming of the bent corrugated tube 1: welding the plug-in block 34 on the outer wall of the crest of the bent corrugated tube 1, and welding the elastic clamping teeth 32 in the notches 341 of the plug-in block 34, and after passing the shaping ratchet bar 31 through each notch 341, welding one end of the shaping ratchet bar 31 to the bent corrugated tube 1; after welding the positioning ring 113 outside the straight tube portion 11, the sleeve 114 is sleeved on the straight tube portion 11, and then the anti-slip ring 111 is welded on the straight tube portion 11;

[0058] S3: Welding and forming the connecting pipe 2: welding the arc bottom plate 41 on the end surface of the second connecting pipe 23; sleeve the outer connecting pipe 222 outside the first connecting pipe 22, and then weld the retaining ring 221 on the outer wall of the first connecting pipe 22;

[0059] S4: Assembly between the connecting pipe 2 and the bent bellows 1: Place the straight pipe portion 11 of the bent bellows 1 on the arc bottom plate 41, so that the positioning ring 113 and the anti-slip ring 111 are located at both ends of the retaining ring 44, and the arc cover plate 42 and the arc bottom plate 41 are combined and bolted to complete the preparation of the supercharger return oil pipe.

[0060] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A supercharger oil return pipe assembly, comprising an oil return pipe body, wherein the oil return pipe body comprises a bent corrugated pipe (1) and two connecting pipes (2) for connecting to the supercharger or the crankcase, wherein the two connecting pipes (2) are respectively connected to the two ends of the bent corrugated pipe (1); characterized in that: A plug-in block (34) is fixed to the outer wall of each wave crest of the bent corrugated tube (1), and a notch (341) is provided on the plug-in block (34); a shaping structure (3) is provided on the outer side of the bent corrugated tube (1), and the shaping structure (3) comprises a shaping ratchet bar (31) and a plurality of elastic locking teeth (32); The shaping ratchet bar (31) is made of plastic metal, one end of the shaping ratchet bar (31) is fixedly connected to the outer wall of one end of the bent corrugated tube (1), and the other end passes through the notches (341) of each plug-in block (34) in sequence; The elastic latch teeth (32) correspond to the plug-in blocks (34) one by one, the elastic latch teeth (32) are fixed in the notches (341) of the plug-in blocks (34), the elastic latch teeth (32) are meshed with the tooth grooves of the shaping ratchet bar (31), and the elastic latch teeth (32) can be elastically deformed in a direction away from the shaping ratchet bar (31); Each of the plug-in blocks (34) is provided with a locking piece, and the elastic tooth (32) is relatively fixed to the shaping ratchet bar (31) through the locking piece; the elastic tooth (32) comprises a U-shaped plate (321) and a tooth block (324); the U-shaped plate (321) is composed of a bottom plate (322) and two side plates (323) integrally connected to the bottom plate (322) on both sides, wherein one of the side plates (323) is fixedly connected to the inner wall of the bending corrugated tube (1) away from the notch (341); the tooth block (324) is fixed to one end of the other side plate (323) away from the bottom plate (322); the tooth block (324) can mesh with the tooth groove of the shaping ratchet bar (31).

2. The supercharger oil return pipe assembly according to claim 1, characterized in that: The locking member is a locking bolt (33) which is inserted into the plug-in block (34) and is threadedly connected to the plug-in block (34). One end of the locking bolt (33) which is inserted into the plug-in block (34) passes through a side plate (323) connected to the plug-in block (34) and can abut against the side plate (323) connected to the tooth block (324).

3. A supercharger oil return pipe assembly according to any one of claims 1-2, characterized in that: The bent corrugated pipe (1) and the connecting pipe (2) are arranged separately, the two connecting pipes (2) are detachably connected to the bent corrugated pipe (1), and the connecting pipe (2) is rotatably connected to the bent corrugated pipe (1).

4. The supercharger oil return pipe assembly according to claim 3, characterized in that: The connecting pipe (2) comprises a telescopic bellows section (21) and a first connecting pipe (22) and a second connecting pipe (23) integrally formed at both ends of the telescopic bellows section (21); an interface is provided on the supercharger and the crankcase; an outer peripheral surface of one end of the first connecting pipe (22) away from the telescopic bellows section (21) is formed with an external thread (223); the first connecting pipe (22) is inserted into the interface and is threadedly connected to the inner wall of the interface via the external thread (223); a retaining ring (221) is fixed on the outer peripheral surface of the first connecting pipe (22); the first connecting pipe (2 2) The outer coaxial sleeve is provided with an external tube (222), the external tube (222) is movably connected to the first tube (22), the retaining ring (221) is located in the external tube (222), one end of the external tube (222) is provided with a sealing plate (226), the sealing plate (226) is in contact with the retaining ring (221), an inner peripheral surface of the external tube (222) is formed with an internal thread (224), the external tube (222) is threadedly connected to the outer wall of the interface through the internal thread (224), and the external thread (223) and the internal thread (224) have opposite rotation directions.

5. The supercharger oil return pipe assembly according to claim 4, characterized in that: The telescopic bellows section (21) is provided with fixing blocks (211) on the outer wall of the wave crests at both ends thereof, a connecting rod (212) is passed through the two fixing blocks (211), both ends of the connecting rod (212) pass through adjacent fixing blocks (211), locking nuts (213) are provided on both sides of each fixing block (211), the locking nuts (213) are sleeved on the connecting rod (212) and are threadedly connected to the connecting rod (212), and the locking nuts (213) abut against the side walls of the adjacent fixing blocks (211).

6. The supercharger oil return pipe assembly according to claim 4, characterized in that: The two ends of the bent bellows (1) are integrally formed with straight tube portions (11); an arc-shaped bottom plate (41) is fixed to one end of the second connecting tube (23) away from the telescopic bellows section (21); an arc-shaped cover plate (42) adapted to the arc-shaped bottom plate (41) is detachably connected to the arc-shaped bottom plate (41); a connecting channel for inserting the straight tube portion (11) is formed between the arc-shaped cover plate (42) and the arc-shaped bottom plate (41); an anti-slip ring (111) and a positioning ring (113) are coaxially arranged on the outer peripheral surface of the straight tube portion (11); the positioning ring (113) is located on a side of the anti-slip ring (111) away from the bent bellows (1); a retaining ring (44) is fixed to the inner wall of the connecting channel; when the connecting tube (2) section is inserted into the connecting channel, the positioning ring (113) and the anti-slip ring (111) are respectively located at two ends of the retaining ring (44).

7. The supercharger oil return pipe assembly according to claim 6, characterized in that: A sleeve (114) is provided between the positioning ring (113) and the anti-slip ring (111); the sleeve (114) is sleeved outside the straight tube portion (11); a rotating spherical surface (115) is formed on the outer wall of the sleeve (114); and a spherical groove (441) adapted to the rotating spherical surface (115) of the sleeve (114) is provided on the inner wall of the retaining ring (44).

8. The supercharger oil return pipe assembly according to claim 7, characterized in that: The second connecting pipe (23) is provided with a groove on its inner wall near the anti-slip ring (111), and the groove is filled with a felt ring (232). The anti-slip ring (111) and the inner wall of the felt ring (232) are tightly fitted together. The side wall of the anti-slip ring (111) near the retaining ring (44) is formed with an inclined surface, and a plurality of wire grooves (112) are provided on the inclined surface.

9. A method for preparing a supercharger oil return pipe assembly according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Preliminary forming of the connecting tube (2) and the bent bellows (1): Select a metal tube of a set size as the connecting tube substrate and the bent bellows substrate, place each metal tube in a corresponding connecting tube mold and a bent bellows mold, and the position of the metal tube to be processed into a corrugated section corresponds to the corrugated mold of the mold. Then, inject high-pressure liquid into each mold, and use a hydraulic forming process to extrude the metal tube transversely to the set required corrugation, thereby completing the preliminary forming of the connecting tube (2) and the bent bellows (1); S2: Welding and forming the bent corrugated tube (1): welding a plug-in block (34) on the outer wall of the wave crest of the bent corrugated tube (1), and welding an elastic clamping tooth (32) in the notch (341) of the plug-in block (34), passing the shaping ratchet bar (31) through each notch (341), and then welding one end of the shaping ratchet bar (31) to the bent corrugated tube (1); after welding a positioning ring (113) on the outside of the straight tube portion (11), sleeve (114) is sleeved on the straight tube portion (11), and then an anti-slip ring (111) is welded on the straight tube portion (11); S3: Welding and forming the connecting pipe (2): welding the arc-shaped bottom plate (41) on the end surface of the first connecting pipe (22); sleeve the external connecting pipe (222) on the outside of the second connecting pipe (23), and then weld the retaining ring (221) on the outer wall of the second connecting pipe (23); S4: Assembly between the connecting pipe (2) and the bent corrugated pipe (1): Place the straight pipe portion (11) of the bent corrugated pipe (1) on the arc-shaped bottom plate (41), so that the positioning ring (113) and the anti-slip ring (111) are located at both ends of the retaining ring (44), and the arc-shaped cover plate (42) and the arc-shaped bottom plate (41) are connected and fixed by bolts, thereby completing the assembly between the connecting pipe (2) and the bent corrugated pipe (1).

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