A polishing device for a fuel pump shaft of an automobile

Abstract

The utility model discloses a kind of automobile fuel pump shaft polishing devices, containing rack, mounting bracket and bearing table, clamping device positioning pump body are equipped in bearing table center line;Lifting device is composed of slide bar, sliding seat, motor and synchronous belt drive, drive bearing table axial feeding;Transverse clamping device contains opposite screw rod, screw rod nut, matched mounting seat and motor, drive two sides mounting seat symmetrical close together;Every mounting seat is equipped with motor, and two polishing wheels are driven to contact polishing with pump shaft by mounting block;The guiding groove of mounting bracket and the guiding convex strip of mounting seat limit linear motion, screw rod limiting piece and fastener cooperate to limit screw rod axial movement, and limiting rod on mounting block restrains swing.The device realizes in-situ polishing without disassembling pump, and controlled feeding and symmetrical clamping make surface quality stable, reduce additional load to original bearing, improve efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of surface polishing technology for rotating shaft parts, and in particular to a polishing device for automotive fuel pump shafts. Background Technology

[0002] The surface quality of the pump shaft in an automotive fuel pump directly affects the bearing fit and sealing effect, which in turn affects the overall noise, leakage, and lifespan of the machine. There are two main existing methods: one is to remove the pump and send it to a lathe or grinding machine for machining; the other is to perform simple on-site machining using a hand-held sander or cloth wheel. The former involves a large amount of disassembly and realignment work, long downtime, and risks of handling and secondary damage; the latter relies on the operator's feel, making it difficult to maintain consistent pressure and residence time, easily leading to over-polishing or the creation of circumferential grooves, resulting in poor surface quality stability.

[0003] With the pump shaft still mounted within the bearings and pump body, ensuring stable rotation of the extended shaft without altering the components and achieving in-situ polishing under constant pressure presents a challenge for on-site maintenance. Common side-pressure friction drives are prone to slippage and unstable speed under wet conditions, and also apply additional loads to the existing bearings, leading to overheating and potential lifespan issues. Therefore, it is necessary to provide a polishing device that can be performed in-situ without disassembling the pump or modifying any components, enabling controlled relative movement and constant-force polishing of the pump shaft, thereby improving maintenance efficiency. Utility Model Content

[0004] This invention aims to solve the problem of the difficulty in performing stable and controllable in-situ polishing of the extended pump shaft of an automotive fuel pump without disassembling the pump or modifying the parts.

[0005] The technical solution of this utility model is as follows: A polishing device for an automotive fuel pump shaft, comprising: a frame; a mounting bracket mounted on the frame; a support platform disposed below the mounting bracket; a clamping device mounted on the support platform along the centerline; a lifting device comprising a slide block, a slide rod, a primary motor, a mounting component, a synchronous pulley, and a synchronous belt, wherein one end of the slide block is fixedly connected to one side of the support platform via the mounting component, and the primary motor drives the lifting of the slide block, thereby causing the support platform to slide along the guide slide rod; and a transverse clamping device comprising opposing wires. The system comprises a rod, a lead screw nut, a mounting base, a second motor, and a third motor. The mounting base is symmetrically positioned on the mounting frame. The lead screw nut is fixedly connected to the mounting base. The second motor drives the opposing lead screw to rotate, causing the lead screw nut to move axially. The lead screw nut then pushes the mounting base closer together. A lead screw limiting component is located in the middle of the opposing lead screw. A third motor is mounted above the mounting base, and two polishing wheels are mounted below the third motor. A mounting block is fixedly connected below the mounting base, and the polishing wheels pass through the mounting frame and are fixedly mounted on the mounting block.

[0006] Furthermore, according to the aforementioned automotive fuel pump shaft polishing device, the clamping device includes symmetrically arranged clamping arms, a rotating shaft is longitudinally arranged on the clamping arms, one end of the rotating shaft is threaded and integrally formed with the clamping arms; it also includes a nut, the nut is provided with a threaded groove corresponding to the thread on the rotating shaft, and the bottom end of the nut is provided with a pin hole.

[0007] Preferably, according to the aforementioned automotive fuel pump shaft polishing device, a mounting plate is provided on one side of the mounting bracket, and the transverse clamping device is mounted on the mounting plate; a plurality of limiting rods are sleeved in the middle of the mounting block, and the two ends of the limiting rods are fixed on the frame.

[0008] Preferably, in some embodiments, according to the aforementioned automotive fuel pump shaft polishing device, the lifting device is symmetrically fixed on both sides of the frame, and the lifting device on one side is provided with the first motor, the synchronous pulley and the synchronous belt, and the pulley is connected to the first motor through a connecting shaft.

[0009] Preferably, in the aforementioned automotive fuel pump shaft polishing device, the mounting bracket has a guide groove, and the mounting base has a corresponding guide protrusion.

[0010] Preferably, in the aforementioned automotive fuel pump shaft polishing device, a plurality of limiting rods are sleeved on the mounting block, and the two ends of the limiting rods are fixed on the frame.

[0011] The beneficial effects of this utility model are as follows: without disassembling the pump or modifying the parts, in-situ polishing of the extended pump shaft is achieved through symmetrical clamping and controlled feed combined with polishing power, reducing disassembly and alignment time; the pressure and speed of the polishing process are stable, which can reduce the risk of over-polishing and circumferential grooves, and improve the consistency of surface roughness and dimensions; symmetrical force reduces the additional load on the original bearing, making it more convenient to work near the shoulder, keyway and other positions and less likely to cause accidental damage, while changing the type and repeating positioning is faster, and the overall safety and efficiency are improved. Attached Figure Description

[0012] Figure 1 This is a side view of a polishing device for an automotive fuel pump shaft provided in an embodiment of this application. Figure 2 This is a front structural schematic diagram of an automotive fuel pump shaft polishing device provided in an embodiment of this application; Figure 3 for Figure 2 A cross-sectional view of the clamping device in an automotive fuel pump shaft polishing apparatus provided in this application embodiment; Figure 4A schematic diagram of the lifting device structure in an automotive fuel pump shaft polishing device provided in this application embodiment; Figure 5 A schematic diagram of a transverse clamping device in an automotive fuel pump shaft polishing apparatus provided in this application embodiment; Figure 6 A schematic diagram of the fastener structure in the transverse clamping device of an automotive fuel pump shaft polishing device provided in an embodiment of this application; Attached icon numbers: 1. Frame; 11. Mounting plate; 2. Support platform; 3. Lifting device; 31. Slide; 32. Synchronous belt; 33. Synchronous belt pulley; 34. Motor No. 1; 35. Slide rod; 4. Clamping device; 41. Clamping arm; 42. Rotating shaft; 43. Nut; 5. Mounting bracket; 51. Mounting base; 52. Mounting block; 53. Limiting rod; 54. Guide groove; 55. Guide protrusion; 6. Lateral clamping device; 61. Opposing lead screw; 62. Lead screw nut; 63. Motor No. 2; 64. Motor No. 3; 65. Fastener; 66. Lead screw limiting component. Detailed Implementation

[0013] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.

[0014] The surface quality of the pump shaft in an automotive fuel pump directly affects the bearing fit and sealing effect, which in turn affects the overall noise, leakage, and lifespan of the machine. There are two main existing methods: one is to remove the pump and send it to a lathe or grinding machine for machining; the other is to perform simple on-site machining using a hand-held sander or cloth wheel. The former involves a large amount of disassembly and realignment work, long downtime, and risks of handling and secondary damage; the latter relies on the operator's feel, making it difficult to maintain consistent pressure and residence time, easily leading to over-polishing or the creation of circumferential grooves, resulting in poor surface quality stability.

[0015] With the pump shaft still mounted within the bearings and pump body, ensuring stable rotation of the extended shaft without altering the components and achieving in-situ polishing under constant pressure presents a challenge for on-site maintenance. Common side-pressure friction drives are prone to slippage and unstable speed under wet conditions, and also apply additional loads to the existing bearings, leading to overheating and potential lifespan issues. Therefore, it is necessary to provide a polishing device that can be performed in-situ without disassembling the pump or modifying any components, enabling controlled relative movement and constant-force polishing of the pump shaft, thereby improving maintenance efficiency.

[0016] This invention aims to solve the problem of the difficulty in performing stable and controllable in-situ polishing of the extended pump shaft of an automotive fuel pump without disassembling the pump or modifying the parts.

[0017] This embodiment discloses a polishing device for an automotive fuel pump shaft, comprising: a frame 1; a mounting bracket 5 mounted on the frame 1; a support platform 2 disposed below the mounting bracket 5; a clamping device 4 mounted on the support platform 2 along the centerline; a lifting device 3, comprising a slide block 31, a slide rod 35, a primary motor 34, a mounting component, a synchronous pulley 33, and a synchronous belt 32, wherein one end of the slide block 31 is fixedly connected to one side of the support platform 2 via the mounting component, and the primary motor 34 drives the slide block 31 to lift and lower, thereby causing the support platform 2 to slide along the guide slide rod 35; and a transverse clamping device 6, comprising a counteracting lead screw 61, a guide screw 62, and a guide screw 63. The system includes a screw nut 62, a mounting base 51, a second motor 63, and a third motor 64. The mounting base 51 is symmetrically placed on the mounting frame 5. The screw nut 62 is fixedly connected to the mounting base 51. The second motor 63 drives the opposing screw 61 to rotate, causing the screw nut 62 to move axially. The screw nut 62 then pushes the mounting base 51 closer to the center. There is a screw limiter 66 in the middle of the opposing screw 61. The third motor 64 is installed above the mounting base 51. Two polishing wheels are installed below the third motor 64. The mounting block 52 is fixedly connected below the mounting base 51. The polishing wheels pass through the mounting frame 5 and are fixed on the mounting block 52.

[0018] It can be understood that the opposing lead screw 61 refers to the two sections of the same lead screw with opposite directions of rotation. The opposing lead screw 61 is provided with a lead screw limiting member 66 in the middle. The lead screw limiting member 66 is fixed on the opposing lead screw 61 and is integrally formed with the opposing lead screw 61. The two opposing lead screw nuts 62 are respectively matched on the corresponding thread sections. When the lead screw is driven to rotate by the second motor 63, the two nuts will move towards each other or away from each other in equal amounts.

[0019] Installation along the centerline means that the clamping device 4 is arranged symmetrically with respect to the bearing platform 2 so as to coincide with the working centerline of the polishing wheels on both sides.

[0020] The slide block 31 slides along the guide rod 35, indicating that the slide block 31 only moves up and down in a straight line relative to the guide rod 35 without swinging or deviating. The slide block 31 is rigidly connected to the support platform 2 through the mounting component, thus it can drive the support platform 2 to move up and down synchronously.

[0021] Mounting block 52 is used to support and fix the rotating parts of the polishing wheel, so that the position of the polishing wheel is stable and can pass through the mounting bracket 5 to reach the workpiece side.

[0022] The lead screw limiter 66 is used to restrict the axial movement of the opposing lead screw 61. Its structure can be a limit ring or retaining ring fixed to the lead screw. After installation, it abuts against the fastener 65 fixed on the mounting bracket 5, rotates with the opposing lead screw 61 but does not make axial displacement, thus limiting the degree of freedom of the opposing lead screw 61 to pure rotation. The second motor 63 only causes the opposing lead screw 61 to rotate under the condition that its axial position is locked by the limiter. The two lead screw nuts 62 move equally towards or away from each other along their respective thread sections, driving the mounting base 51 to make symmetrical linear motion, so that the polishing wheel makes controlled contact with the outer circle of the pump shaft. The first motor 34 drives the bearing platform 2 to feed along the slide bar 35 to cover the bandwidth; after completion, it retracts in the opposite direction. This limiting method avoids axial movement of the lead screw under load, temperature rise or impact, ensures the synchronization of the two mounting bases 51 and the consistency of the polishing gap, reduces uneven wear and misalignment, and improves operational stability and safety.

[0023] During operation, the fuel pump is placed on the support platform 2 and clamped and positioned by the clamping device 4; the first motor 34 drives the slide 31 to rise and fall via the synchronous pulley 33 and the synchronous belt 32, so that the support platform 2 is aligned to the target height; after the third motor 64 starts, it drives the two polishing wheels on the mounting block 52 to rotate; then the second motor 63 drives the opposing lead screw 61 to rotate, and the two lead screw nuts 62 move axially and, through the fixed connection with the mounting base 51, make the two mounting bases 51 symmetrically move towards the middle, and the polishing wheel contacts the outer circle of the pump shaft and applies pressure; in the contact state, the axial feed is completed by the lifting device 3 to cover the required bandwidth, and after polishing, it retracts back to the mounting base 51 and the third motor 64 stops. This structure and process enable in-situ polishing of the extended pump shaft without disassembling the pump or modifying any parts: the opposing lead screw 61 clamps both sides synchronously and with symmetrical force, reducing the additional load on the original bearing; the slide 31 guides and lifts to provide controllable feed, which, together with the constant speed polishing wheel, reduces the risk of over-polishing and circumferential grooves, improving surface quality and batch consistency; the lead screw limit component 66 prevents accidental overtravel, improving operational safety and reliability.

[0024] In some embodiments, a rectangular groove is provided on the support platform 2, and the clamping device 4 is fixed on one side of the rectangular groove.

[0025] In this embodiment, it can be understood that the rectangular groove refers to a rectangular recessed platform opened on the surface of the support platform 2, whose four walls are parallel to the reference edge of the support platform 2, and is used as a reference area for workpiece placement and fixture positioning. "Fixed on one side of the rectangular groove" means that the clamping device 4 is fixed to one side wall of the groove or its adjacent table by bolts or pressure plates and does not move when used.

[0026] In use, the fuel pump body is placed in the groove or against the straight edge of the groove on the other side. The clamping device 4 clamps from the fixed side towards the centerline. The straight edge of the groove provides reliable lateral positioning and anti-rotation constraint. The right angle between the groove wall and the bottom surface ensures consistent workpiece posture. The clamping reaction force is directly borne by the groove sidewall and the support platform 2, thereby reducing slippage and swaying of the workpiece during polishing and facilitating repeated clamping and alignment. At the same time, the groove provides a recessed space for the polishing area, ensuring that the polishing wheel, mounting base 51, and workpiece do not interfere with each other, and providing a collection and discharge channel for coolant and debris. Through the above structure, the technical effects of repeatable clamping position, simple centering, more stable clamping, and a cleaner processing area can be achieved, which is conducive to improving surface quality consistency and on-site operation efficiency.

[0027] In some embodiments, the clamping device 4 includes symmetrically arranged clamping arms 41, with a rotating shaft 42 longitudinally arranged on the clamping arms 41. One end of the rotating shaft 42 is threaded and integrally formed with the clamping arms 41. It also includes a nut 43, with a threaded groove corresponding to the thread on the rotating shaft 42 inside the nut 43, and a pin hole at the bottom end of the nut 43.

[0028] In this embodiment, the clamping arms 41 are load-bearing components arranged in pairs symmetrically; The rotating shaft 42 refers to the adjusting shaft that is arranged longitudinally along the clamping arm 41 and integrally formed with the clamping arm 41, and its end is provided with an external thread to cooperate with the threaded groove in the nut 43. The rotating shaft 42 is an adjustment shaft integrally formed with the clamping arm 41 and arranged longitudinally therein. Its end has an external thread to mate with the threaded groove inside the nut 43. The bottom end of the nut 43 has a pin hole, and the clamping device 4 has a corresponding insertion hole. In use, first simultaneously screw the rotating shaft 42 and the nut 43 to bring the two clamping arms 41 together to the target clamping force. After maintaining this clamping force, rotate the nut 43 separately using only the thread on the rotating shaft 42 to adjust its angle. When the pin hole on the nut 43 aligns with the insertion hole on the clamping device 4, insert the pin to mechanically lock the nut 43 relative to the clamping device 4. This locking does not change the predetermined axial clamping force; it only restricts the rotation of the nut 43, preventing loosening under vibration conditions, ensuring stable clamping, and providing quick assembly and disassembly with reliable repeatability.

[0029] In some embodiments, the mounting bracket 5 is provided with a mounting plate 11 on one side, and the transverse clamping device 6 further includes a fastener 65 for mounting the transverse clamping device 6 on the mounting plate 11, with the lead screw limit member 66 abutting against both sides of the fastener 65. In this embodiment, it can be understood that the mounting plate 11 is a fixed base surface set on one side of the frame 1.

[0030] Fastener 65 is used to detachably fix the entire transverse clamping device 6 to the mounting plate 11; the "lead screw limiter 66" is fitted onto the opposing lead screw 61 and fixed to the lead screw, structurally forming opposing limiting shoulders on its outer periphery. During assembly, fastener 65 first positions and locks the transverse clamping device 6 onto the mounting plate 11, and the lead screw limiter 66 is located on both sides of fastener 65 and abuts against the two end faces of fastener 65, thereby limiting the axial movement of the opposing lead screw 61 without affecting rotation; during operation, motor 63 drives the lead screw, allowing the lead screw to rotate freely only in the axial position constrained by the limiter, driving the lead screw nuts 62 on both sides to move in equal amounts towards / away from each other. This structure realizes modular installation and quick disassembly, making the axial position of the lead screw stable and preventing slippage, reducing clearance changes caused by load or vibration, ensuring the clamping stroke is synchronized with both sides, and facilitating quick replacement or correction of the transverse clamping assembly during maintenance by loosening fastener 65.

[0031] In some embodiments, lifting devices 3 are symmetrically fixed on both sides of the frame 1. A first motor 34, a synchronous pulley 33 and a synchronous belt 32 are provided on one side of the lifting device 3. The pulley is connected to the first motor 34 through a connecting shaft.

[0032] It is understandable that symmetrical fixed installation refers to the rigid installation of two sets of lifting devices 3 on the left and right sides of the frame 1 in a mirror manner, which are used to jointly support and guide the lifting of the bearing platform 2.

[0033] The connecting shaft refers to the torque transmission shaft or coupling assembly located between the output end of the first motor 34 and the synchronous pulley 33, used for coaxial connection and to compensate for minor installation deviations. The first motor 34, synchronous pulley 33, and synchronous belt 32 are arranged on one side of the lifting device 3. The motor drives the pulley to rotate via the connecting shaft, and then drives the side slide 31 to rise and fall along the slide rod 35 via the synchronous belt 32. The bearing platform 2 and the opposite side slide 31 are rigidly connected, thus enabling both sides to synchronously follow and complete a smooth linear lifting and lowering operation. This structure suppresses overturning and swaying through symmetrical left and right guidance, ensuring the parallelism and repeatability of the lifting and lowering of the bearing platform 2; the motor is only arranged on one side, reducing upper interference and facilitating maintenance; the connecting shaft shares the cantilever load and reduces the lateral force on the motor bearings, making the transmission more reliable and the operation smoother.

[0034] In some embodiments, the mounting bracket 5 is provided with a guide groove 54, and the mounting base 51 is provided with a corresponding guide protrusion 55.

[0035] It is understandable that the guide groove 54 is a strip-shaped recessed guide surface provided on the mounting bracket 5. The guide groove 55 is a protruding guide part that mates with the mounting base 51. The two are fitted with a small clearance to form a pair of linear guides, so that the mounting base 51 can only move laterally in a straight line along the groove direction during operation without swaying, twisting or tilting. When the second motor 63 drives the lead screw nut 62 to push the mounting base 51 against the groove, the guide pair bears the lateral constraint and load transmission, ensuring that the two mounting bases 51 move towards the centerline in a symmetrical and equal manner. This keeps the polishing wheel and the pump shaft in stable contact in the same plane, avoiding deviation, edge chipping and gap crawling, and reducing the lateral force and wear on the lead screw and nut. This achieves the technical effect of smooth movement, good positioning repeatability and high polishing consistency. The end of the guide groove 54 can be fitted with a limit surface or buffer pad to prevent overtravel, and the guide surface can be added with wear-resistant strips or lubricant to improve service life and smoothness.

[0036] In some embodiments, a plurality of limiting rods 53 are sleeved on the mounting block 52, and the two ends of the limiting rods 53 are fixed on the frame 1.

[0037] It can be understood that the limiting rod 53 refers to a rigid rod that passes through the mounting block 52 and forms a sleeve fit with it.

[0038] The mounting block 52 is provided with a through hole, and the through hole and the limiting rod 53 are in clearance or sliding fit.

[0039] The fact that both ends are fixed on the frame 1 indicates that the limit rod 53 does not move relative to the frame 1, and only the mounting block 52 is allowed to make restricted movements relative to the rod or only to act as an anti-sway constraint.

[0040] During operation, the lateral reaction force and vibration generated by the polishing wheel are borne by the rigid circuit formed by the limiting rod 53 and the frame 1. The mounting block 52 is guided and limited along the limiting rod 53, preventing significant swaying, warping, or shifting, thus maintaining the relative position stability between the polishing wheel and the pump shaft. The resulting technical effects are: reduced vibration and offset of the mounting block 52, prevention of polishing wheel misalignment and edge chipping, reduction of lateral load on transmission components such as the lead screw and nut, improved operational stability and repeatability, which in turn contributes to obtaining more consistent surface quality and improving the overall reliability of the machine.

[0041] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A polishing device for an automotive fuel pump shaft, characterized in that, include: Rack (1); Mounting bracket (5) is mounted on the frame (1); The support platform (2) is located below the mounting frame (5); The clamping device (4) is installed on the support platform (2) along the center line; The lifting device (3) includes a slide (31), a slide rod (35), a first motor (34), a mounting component, a synchronous pulley (33), and a synchronous belt (32). One end of the slide (31) is fixedly connected to one side of the support platform (2) through the mounting component. The first motor (34) drives the slide (31) to lift, and the slide (31) in turn drives the support platform (2) to slide along the guide of the slide rod (35). The transverse clamping device (6) includes a counteracting lead screw (61), a lead screw nut (62), a mounting base (51), a second motor (63), and a third motor (64). The mounting base (51) is symmetrically placed on the mounting frame (5). The lead screw nut (62) is fixedly connected to the mounting base (51). The second motor (63) drives the counteracting lead screw (61) to rotate, causing the lead screw nut (62) to move axially. The lead screw nut (62) then pushes the mounting base (51) to move closer to the center. There is a lead screw limiting member (66) in the middle of the counteracting lead screw (61). The third motor (64) is installed above the mounting base (51). Two polishing wheels are installed below the third motor (64). A mounting block (52) is fixedly connected below the mounting base (51). The polishing wheels pass through the mounting frame (5) and are fixedly mounted on the mounting block (52).

2. The automotive fuel pump shaft polishing device according to claim 1, characterized in that, A rectangular groove is provided on the support platform (2), and the clamping device (4) is fixed on one side of the rectangular groove.

3. The automotive fuel pump shaft polishing device according to claim 2, characterized in that, The clamping device (4) includes symmetrically arranged clamping arms (41), with a rotating shaft (42) longitudinally arranged on the clamping arms (41). One end of the rotating shaft (42) is threaded and integrally formed with the clamping arms (41). It also includes a nut (43), with a threaded groove corresponding to the thread on the rotating shaft (42) inside the nut (43), and a pin hole at the bottom end of the nut (43).

4. The automotive fuel pump shaft polishing device according to claim 1, characterized in that, The mounting bracket (5) has a mounting plate (11) on one side. The transverse clamping device (6) also includes a fastener (65) for mounting the transverse clamping device (6) on the mounting plate (11). The lead screw limiter (66) abuts against both sides of the fastener (65).

5. The automotive fuel pump shaft polishing device according to claim 4, characterized in that, The lifting device (3) is symmetrically fixed on both sides of the frame (1). The lifting device (3) on one side is equipped with the first motor (34), the synchronous pulley (33) and the synchronous belt (32). The pulley is connected to the first motor (34) through a connecting shaft.

6. The automotive fuel pump shaft polishing device according to claim 5, characterized in that, The mounting bracket (5) has a guide groove (54), and the mounting base (51) has a corresponding guide protrusion (55).

7. The automotive fuel pump shaft polishing device according to claim 5, characterized in that, The mounting block (52) is fitted with several limiting rods (53), and the two ends of the limiting rods (53) are fixed on the frame (1).

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