Plastic doctor blade structure for VVT engine

Abstract

The utility model relates to a plastic doctor blade structure for a VVT (variable valve timing) engine, and aims to solve the problems that an existing doctor blade is easy to break and poor in buffering performance. The structure comprises a plurality of evenly-distributed scraper structures, each scraper structure comprises a plurality of plastic scrapers arranged in a curve mode, the angle difference between the two ends of each scraper structure is 45-60 degrees, the scrapers are connected through a fixing piece, and a connecting rod penetrates through the center of each scraper structure. One end of the connecting rod is connected with the limiting piece, and the limiting plate is movably connected above the limiting piece. A fixing rod is arranged in the connecting rod, and the torsional spring is sleeved outside the fixing rod and fixed by the extending shell. The limiting plate is provided with an adjusting groove, and a T-shaped sliding piece connected with the limiting piece is arranged in the adjusting groove. The scraper structures are connected through the connecting frame, the extending shell penetrates through the scraper structures and is movably connected with the scraper structures, and the main rod on the connecting frame can be connected with an external driving device. When the plastic scraper is stressed, the torsional spring rotates and shrinks, the limiting piece is separated from the extending shell, elastic potential energy is released to drive the scraper to rotate reversely for buffering, and the limiting plate limits the height of the torsional spring to ensure resetting.

Description

Technical Field

[0001] This utility model provides a plastic scraper structure, belonging to the technical field of VVT engine auxiliary equipment, and particularly relates to a plastic scraper structure for VVT engines. Background Technology

[0002] In VVT engines, plastic scraper structures are commonly used to clean coolant or oil passages to maintain normal engine operation and efficiency. Traditional scraper devices typically consist of several plastic scrapers, fixtures, and connectors, and their basic function is to remove impurities through contact between the scrapers and the passage walls.

[0003] However, the existing scraper structure has significant shortcomings: on the one hand, the scraper is prone to breakage when subjected to rigid force, leading to device failure; on the other hand, traditional scrapers lack an effective buffering mechanism and cannot adapt to dynamic changes under complex working conditions, affecting the durability and cleaning efficiency of the scraper.

[0004] Existing blade scraper devices typically rely on a rigid connection achieved through fasteners and connecting rods. This prevents the scraper from flexibly adjusting its angle or releasing force under load, leading to localized stress concentration. Furthermore, traditional designs do not adequately consider the elastic buffering effect of torsion springs, or the coordinated reset function of limiting components and extended housings. These issues limit the reliability of blade scraper devices under high load or frequent impact conditions, making it difficult to meet the demands of modern VVT engines for efficient and durable cleaning components. Utility Model Content

[0005] In order to solve the above problems, this application provides a plastic scraper structure for VVT engines, which solves the problems of easy breakage and poor buffering performance of existing scrapers, and significantly improves the durability and cleaning efficiency of the scraper.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a plastic scraper structure for a VVT engine, comprising a plurality of evenly distributed scraper structures, wherein the scraper structure comprises a plurality of plastic scrapers, and a plurality of fixing members are provided between the plastic scrapers, and a connecting rod penetrating through itself is provided at the center of the fixing member;

[0007] The plastic scraper blade is generally curved, with an angle difference between its two ends ranging from 45° to 60°; the fixing element penetrates the plastic scraper blade.

[0008] The connecting rod is provided with torsion springs at both ends. The end of the torsion spring away from the connecting rod is fixedly connected to a limiting member, and a limiting plate is movably connected above the limiting member.

[0009] Preferably, the connecting rod has a fixed rod inside that penetrates itself and is longer than the connecting rod, and the fixed rod and the limiting plate are movably connected.

[0010] Preferably, the torsion spring is sleeved on the outside of the fixed rod, and the outer sleeve of the torsion spring has an extended outer shell that is fixedly connected to the connecting rod, and the limiting member is inserted into the interior of the extended outer shell plate.

[0011] Preferably, the limiting plate is provided with an adjustment groove that penetrates itself, and a T-shaped sliding member corresponding to its own shape is provided in the adjustment groove, and the sliding member and the limiting member are fixedly connected.

[0012] Preferably, a connecting frame is provided between the scraper structures to connect all the scraper structures; the connecting frame is penetrated by the extended outer shell, and the two are movably connected. The connecting frame is provided with a main rod fixedly connected to itself, and the other end of the main rod is connected to an external driving device.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] In this invention, when the plastic scraper is subjected to a certain force, it rotates, causing the torsion spring to rotate and contract. The contraction of the torsion spring reduces its diameter, thereby causing the limiting member to move away from the interior of the extended housing. After losing the restraint of the limiting member, the torsion spring releases its elastic potential energy and rotates, causing the connecting rod and the plastic scraper to rotate to a certain extent. Thus, after the plastic scraper is relieved of the rigid force by the torsion spring, it rotates in the direction of the reaction force, achieving both self-buffering and more efficient scraping operation. The entire scraper structure repeats the above process to achieve efficient operation. Simultaneously, during the torsion spring's contraction, the limiting plate always restricts the height of the torsion spring, ensuring that after the torsion spring releases its reaction force, the limiting member can reset and insert into the extended housing for the next buffering and release.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a plastic scraper structure for a VVT engine according to the present invention;

[0017] Figure 2 This is a schematic diagram of a plastic scraper structure for a VVT engine according to the present invention;

[0018] Figure 3 This is a schematic diagram of the fixing rod part of a plastic scraper structure for a VVT engine according to the present invention;

[0019] Figure 4 This is a cross-sectional view of the limiting plate of a plastic scraper structure for a VVT engine according to this utility model.

[0020] As shown in the figure:

[0021] 1. Scraper structure; 2. Plastic scraper; 3. Fixing component; 4. Connecting rod; 5. Torsion spring; 6. Limiting component; 7. Limiting plate; 8. Fixing rod; 9. Extended outer shell; 10. Adjustment groove; 11. Sliding component; 12. Connecting frame; 13. Main rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 and Figure 2 As shown, a plastic scraper structure for a VVT engine mainly consists of several evenly distributed scraper structures 1. Each scraper structure 1 includes several plastic scrapers 2, which are connected by fixing members 3, and a connecting rod 4 passes through the center of the fixing member 3. The scrapers 2 are arranged in a curved pattern, with an angle difference of 45-60° between the two ends, and are penetrated by the fixing member 3. Torsion springs 5 ​​are mounted at both ends of the connecting rod 4, one end of which is connected to a limiting member 6, and a limiting plate 7 is movably connected above the limiting member 6. At the same time, a fixing rod 8 is provided inside the connecting rod 4, which moves with the limiting plate 7. The connected torsion spring 5 is sleeved on the outside of the fixing rod 8, and there is an extended outer shell 9. The limiting member 6 is inserted into the plate of the extended outer shell 9. The limiting plate 7 has an adjustment groove 10 containing a T-shaped sliding member 11, which is fixed to the limiting member 6. The scraper structures 1 are connected by a connecting frame 12, which is penetrated and movably connected by the extended outer shell 9. The main rod 13 on the connecting frame 12 can be connected to an external drive device.

[0026] In this implementation scheme, the coordinated operation of each component achieves efficient buffering and repositioning of the plastic scraper, effectively preventing its breakage due to rigid forces. When the plastic scraper 2 is subjected to external force, it drives the connecting rod 4 to rotate, which in turn causes the torsion spring 5 to rotate and retract. When the torsion spring 5 retracts, its diameter decreases, causing the limiting member 6 to leave the interior of the extended housing 9. At this time, the torsion spring 5 releases its elastic potential energy, driving the connecting rod 4 and the plastic scraper 2 to rotate in opposite directions, achieving a buffering effect. Throughout the process, the limiting plate 7 limits the height of the torsion spring 5 through the adjusting groove 10 and the sliding member 11, ensuring that after it releases its reaction force, the limiting member 6 can smoothly reset and re-insert into the interior of the extended housing 9, preparing for the next buffering operation.

[0027] First, the elastic buffering effect of the torsion spring 5 effectively dissipates rigid forces, preventing breakage due to excessive force and greatly improving the durability and reliability of the scraper. Second, the coordinated operation of the limiting component 6 and the limiting plate 7 ensures the stable operation and timely reset of the torsion spring 5, enabling the device to maintain good buffering performance even after repeated stress. Furthermore, the design of the connecting frame 12 and the main rod 13 allows the entire scraper structure to be effectively connected and work collaboratively with the external drive device, improving the efficiency and stability of scraping operations. In summary, this device, through the ingenious combination of its components, not only solves the problem of easy breakage of traditional plastic scrapers but also achieves more efficient scraping operations, demonstrating significant innovation and practicality.

[0028] like Figure 3 and Figure 4 As shown, when the VVT ​​engine operates with the plastic scraper structure, it relies on the main rod 13 connected to an external drive device to drive the overall movement. The driving force of the main rod 13 is transmitted to the connecting frame 12, causing each scraper structure 1 to move in tandem. The connecting frame 12 is movably connected to the extended housing 9, providing flexible support for the movement of the scraper structure 1. Inside the scraper structure, the torsion springs 5 ​​at both ends of the connecting rod 4 play a crucial role in resetting and elastic transmission. When the connecting rod 4 is rotated under force, the deformation of the torsion springs 5 ​​transmits the movement, driving the limiting member 6 to move. The movable connection between the limiting member 6 and the limiting plate 7 allows the limiting plate 7 to adjust its position accordingly. At the same time, the T-shaped sliding member 11 on the limiting plate 7 slides within the adjusting groove 10, further stabilizing the movement process. The fixed rod 8, which runs through the inside of the connecting rod 4, provides stable support and guidance for the entire motion system, ensuring the coordination and reliability of the movement of each component.

[0029] In this implementation plan, the specific composition and common models of each component are as follows:

[0030] The plastic scraper blades 2 of each scraper structure 1 are typically made of polyamide (PA) or polyoxymethylene (POM), which have good wear resistance and toughness. Their thickness is generally between 2-5mm, width between 10-30mm, and length determined according to the specific requirements of the engine, usually between 50-150mm, to ensure sufficient contact with the channel wall. The fasteners 3 are generally metal bolts or rivets, mostly made of stainless steel or alloy steel. The bolt diameter is between 3-8mm, length between 10-30mm, and thread specifications between M3 and M6 to ensure sufficient connection strength. The connecting rod 4 is made of engineering plastic, such as reinforced nylon PA66GF, with a diameter between 5-15mm and a length between 30-100mm, to meet the installation and connection requirements of the torsion spring 5.

[0031] The torsion spring 5 is generally made of carbon spring steel wire or stainless steel wire, with a wire diameter between 1-3mm and 3-8 coils. In its free state, the outer diameter is between 10-25mm and the inner diameter is between 5-15mm to ensure sufficient elastic deformation and restoring force under external force. The limiting element 6 and the limiting plate 7 are typically made of aluminum alloy or engineering plastic, with a thickness between 2-8mm, a width between 10-30mm, and a length between 20-60mm, to ensure good limiting and movable connection performance. The fixing rod 8 is generally a metal rod made of stainless steel or alloy steel, with a diameter between 3-10mm and a length between 40-120mm, to provide stable support and guidance. The extension shell 9 is made of engineering plastic or aluminum alloy, with a wall thickness between 1-3mm, an outer diameter between 15-30mm, and a length between 40-100mm, to protect the torsion spring 5 and provide insertion space for the limiting element 6.

[0032] The dimensions of the adjusting groove 10 are typically matched to those of the sliding component 11, with a groove width of 5-15 mm, a groove depth of 3-10 mm, and a groove length of 20-60 mm. The sliding component 11 is generally a T-shaped structure, made of polytetrafluoroethylene (PTFE) or reinforced nylon PA66GF, with a thickness of 3-8 mm, a width of 8-20 mm, and a length of 15-40 mm, to ensure smooth sliding within the adjusting groove 10 and effective motion transmission. The connecting frame 12 is typically made of engineering plastic or aluminum alloy, with a thickness of 3-10 mm, a width of 20-60 mm, and a length of 50-150 mm, to provide stable connection and support. The main rod 13 is generally a metal rod, made of stainless steel or alloy steel, with a diameter of 5-15 mm and a length of 80-200 mm, to meet the connection and transmission requirements with external drive devices.

[0033] Based on the existing technical solutions mentioned in the background section, the existing technical implementation methods involved in this case are supplemented and improved to make the technical solutions more complete and clear:

[0034] Existing scraper blade installation method:

[0035] In traditional scraper structures, plastic scrapers (2) are typically manufactured using injection molding, forming an array on a metal substrate through hot-press injection molding. During installation, a split-assembly process is used, where metal fasteners (3) are pre-embedded in the injection mold of the plastic scraper (2). After the scraper is formed, it is fixed to the connecting frame (12) by welding or threaded connection. In specific implementation, the connecting rod (4) is a solid metal rod, with both ends pressed directly into the positioning holes of the scraper base through interference fit, forming a rigid connection.

[0036] Existing drive unit connection methods:

[0037] The main rod (13) is connected to the external drive unit using a standard flange connection structure. The end of the main rod is machined with a spline tooth profile in accordance with ISO5468 standards, which is connected to the spline sleeve of the drive motor output shaft through a clearance fit. The drive unit is usually composed of a servo motor (such as Yaskawa SGM7G series) and a planetary reducer (such as Newcatel PL series), with a rated torque range of 5-20 N·m and a speed adjustment range of 50-300 rpm.

[0038] Traditional limit mechanism implementation method:

[0039] In the prior art, the limiting component (6) adopts a fixed stop structure, which is usually a metal boss welded to the inner wall of the extended shell (9). The limiting plate (7) is an integral steel plate, which is fixed to the side of the connecting frame (12) by four M6 hexagon socket bolts. Its adjustment groove (10) adopts a standardized elongated hole design, and the groove width tolerance is controlled within the H8 grade precision.

[0040] Existing applications of elastic elements:

[0041] Traditional reset springs are mostly cylindrical helical compression springs (according to GB / T2089 standard), with spring wire diameter of 1.2-2.5mm and free height of 15-40mm. They are positioned during installation using a spring guide rod. The spring ends employ a ground-flat end ring structure, and positioning is achieved through the engagement of the spring seat with the groove at the end of the connecting rod.

[0042] Conventional motion transmission mechanism:

[0043] The scraper structure (1) and the connecting frame (12) are connected by a hinge. In specific implementation, a tapered pin connection according to GB / T117-2000 standard is used. The pin diameter is 4-8mm and the length is 20-50mm. The fit tolerance is H7 / h6 level. A DU bushing (according to ISO3547 standard) is installed in the pin hole to realize the rotating pair.

[0044] Existing detection and control technologies:

[0045] Traditional systems are equipped with Hall effect sensors (such as the Allegro A1324 series) to detect the position of the scraper blade. A trigger plate made of magnetic material is installed on the connecting frame (12), and the sensor installation spacing is set to 1.2 times the scraper blade stroke. The control unit uses a PLC (such as Siemens S7-1200) to communicate with the drive unit via the Modbus RTU protocol to achieve adjustable control of the scraper blade movement frequency from 0.5 to 5 Hz.

[0046] Conventional surface treatment processes:

[0047] The surface treatment of metal parts adopts electro-zinc plating (according to GB / T9799 standard) or Dacromet coating process, with a coating thickness of 8-12μm. The surface of the plastic scraper (2) is subjected to PTFE impregnation treatment, with a treatment depth of 0.05-0.1mm and the surface roughness controlled in the range of Ra0.8-1.6μm.

[0048] In use, first connect the main rod 13 of this device to the external drive device, and start the drive device to drive the main rod 13 to rotate. The main rod 13 drives each scraper structure 1 to move synchronously through the connecting frame 12, and the plastic scraper 2 begins cleaning. When the plastic scraper 2 is under force, the connecting rod 4 drives the torsion spring 5 to rotate and retract, and the limiting member 6 disengages from the extension shell 9. At this time, the torsion spring 5 releases its elastic potential energy, causing the scraper to rotate in the opposite direction for buffering. At the same time, the limiting plate 7 limits the height of the torsion spring, ensuring that after it resets, the limiting member 6 re-inserts into the extension shell 9, completing one buffer cycle. Repeating this process achieves efficient and stable cleaning operation.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A plastic wiper blade structure for a VVT engine, comprising a plurality of wiper blade structures (1) uniformly distributed, characterized in that: The scraper structure (1) comprises a plurality of plastic scrapers (2), a plurality of fixing members (3) are arranged between the plastic scrapers (2), and a connecting rod (4) penetrating through the fixing member (3) is arranged at the central position of the fixing member (3); The plastic scrapers (2) are distributed in a curve as a whole, and the angle difference between two ends is in the range of 45-60°; the fixing member (3) penetrates through the plastic scraper (2); The connecting rod (4) is provided with a torsion spring (5) at two ends, the end of the torsion spring (5) away from the connecting rod (4) is fixedly connected with a limiting member (6), and the limiting member (6) is movably connected with a limiting plate (7) above.

2. The plastic wiper blade structure for a VVT engine according to claim 1, wherein: The inside of the connecting rod (4) is provided with a fixing rod (8) penetrating through the connecting rod (4) and having a length greater than that of the connecting rod (4), and the fixing rod (8) and the limiting plate (7) are movably connected.

3. The plastic wiper blade structure for a VVT engine according to claim 2, wherein: The torsion spring (5) is sleeved outside the fixing rod (8), the outside of the torsion spring (5) is sleeved with an extension shell (9) fixedly connected with the connecting rod (4), and the limiting member (6) is inserted into the inside of the plate body of the extension shell (9).

4. The plastic wiper blade structure for a VVT engine according to claim 1, wherein: The limiting plate (7) is provided with an adjusting groove (10) penetrating through the limiting plate (7), the adjusting groove (10) is provided with a T-shaped sliding member (11) corresponding to the shape of the adjusting groove (10), and the sliding member (11) and the limiting member (6) are fixedly connected.

5. The plastic wiper blade structure for a VVT engine according to claim 3, wherein: The scraper structure (1) is provided with a connecting frame (12) connecting all the scraper structures (1); the connecting frame (12) is penetrated by the extension shell (9) and movably connected with the extension shell (9), the connecting frame (12) is provided with a main rod (13) fixedly connected with the connecting frame (12), and the other end of the main rod (13) is connected with an external driving device.

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