A sealed waterproof PLD driver

Abstract

This utility model discloses a sealed and waterproof PLD driver, including a housing and a box connected to the housing. A lead screw is rotated inside the housing, and a drive motor is provided on the box to drive the lead screw to rotate. A drive slider is threaded on the lead screw, and the drive slider is connected to an actuator push rod. The drive motor drives the lead screw to rotate, so that the actuator push rod can extend and retract. A sealing tube is sleeved on the outer periphery of the actuator push rod, and the sealing tube includes a telescopic section and a sealing base provided on the telescopic section. The sealing base is located between the housing and the box, and the housing and the box respectively abut against the upper and lower end faces of the sealing base. The end of the telescopic section is engaged with the actuator push rod and extends and retracts with the actuator push rod. The sealing tube integrates static sealing and dynamic sealing into a single structure, which greatly improves the waterproof and dustproof effect.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a sealed and waterproof PLD driver. Background Technology

[0002] A PLD driver is a power drive device that converts the rotary motion of a motor into the linear reciprocating motion of a push rod. It is widely used in applications requiring remote control, centralized control, or automatic control. With the continuous expansion of application scenarios, PLD drivers are increasingly being used in harsh environments such as outdoors, in humid conditions, and even underwater, which places higher demands on the waterproof sealing performance of the driver.

[0003] Currently, PLD drivers typically include a housing and a casing connected to the housing. A lead screw is rotatably mounted inside the housing, and a drive motor is mounted on the casing to drive the lead screw. A drive slider is mounted on the lead screw, and the drive slider is connected to an actuator push rod. The drive motor drives the lead screw to rotate, causing the actuator push rod to extend and retract. During the operation of the driver, one end of the actuator push rod needs to extend outside the housing to drive external devices. Therefore, there must be a gap between the actuator push rod and the housing. External moisture, dust, etc., can easily enter the housing through this gap, causing the internal lead screw, drive slider, and other precision components to rust and jam, seriously affecting the service life and operational reliability of the driver.

[0004] In existing technologies, a sealing ring is typically installed between the push rod and the housing. The sealing is achieved through the sliding fit between the sealing ring and the push rod surface. The sealing ring and the push rod have a dynamic sealing fit. The long-term reciprocating extension and retraction movement of the push rod will cause the sealing ring to wear, and the sealing performance will decrease, thus affecting the waterproof sealing effect. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a sealed and waterproof PLD driver.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A sealed and waterproof PLD driver includes a housing and a box connected to the housing. A lead screw is rotated inside the housing. A drive motor for driving the lead screw to rotate is provided on the box. A drive slider is threaded onto the lead screw. The drive slider is connected to an actuator push rod. The drive motor drives the lead screw to rotate, causing the actuator push rod to extend and retract. A sealing tube is sleeved around the actuator push rod. The sealing tube includes a telescopic section and a sealing base disposed on the telescopic section. The sealing base is disposed between the housing and the box. The housing and the box respectively abut against the upper and lower end faces of the sealing base. The end of the telescopic section is engaged with the actuator push rod and extends and retracts with the actuator push rod.

[0007] Preferably, the housing includes a transmission mounting part connected to the lead screw and a push rod guide part for the extension of the actuator push rod. The sealing base synchronously seals the connection area between the housing and the transmission mounting part, as well as the connection area between the housing and the push rod guide part. Through the above improvements, it is ensured that the transmission mounting part and the push rod guide part of the housing have good sealing performance with the housing, thereby improving the sealing effect.

[0008] Preferably, the end of the telescopic section is provided with a snap-fit ​​protrusion, and the actuating push rod is provided with an annular locking platform. The snap-fit ​​protrusion forms a sealing groove for the annular locking platform to be inserted. Through the above improvements, the snap-fit ​​protrusion at the end of the telescopic section and the annular locking platform on the push rod that cooperates with the sealing groove achieve reliable snap-fit ​​and sealing between the telescopic section and the actuating push rod. This effectively prevents moisture from seeping in from between the outer periphery of the actuating push rod and the end of the telescopic section. At the same time, the snap-fit ​​structure can withstand the axial tension when the actuating push rod reciprocates, preventing the telescopic section from loosening or shifting. This ensures the stability and durability of the sealing structure during long-term use, and the assembly is simple, which is conducive to improving production efficiency.

[0009] Preferably, the housing is provided with a positioning protrusion, and the sealing base is provided with a positioning groove for the positioning protrusion to be inserted. Through the above improvements, the sealing base is quickly and accurately positioned at the joint between the housing and the housing, effectively avoiding the sealing base from tilting or misaligning during assembly. This ensures that the housing and the housing are evenly stressed and tightly pressed against the upper and lower end faces of the sealing base, thereby significantly improving the sealing reliability of the joint and preventing the sealing base from displacing under the vibration of the driver or external pressure, ensuring the long-term stability of the sealing performance during long-term use.

[0010] Preferably, the end of the housing opposite to the end connected to the enclosure is connected to a rear end cover, and a first sealing gasket is provided between the housing and the rear end cover. Through the above improvements, the path of external moisture and dust seeping in from the gap between the rear end cover and the housing can be effectively blocked, significantly improving the overall waterproof rating of the driver.

[0011] Preferably, a second sealing gasket is provided between the drive motor and the housing. Through the above improvements, by providing a second sealing gasket between the drive motor and the housing, the mating gap between the motor mounting surface and the housing can be effectively sealed, preventing external moisture and dust from seeping into the housing along the motor shaft insertion part, and further improving the overall waterproof protection level of the driver.

[0012] Preferably, a mounting plate is provided at one end of the housing, a drive cavity is provided inside the housing, a drive wheel assembly for driving the lead screw to rotate is provided in the drive cavity, an execution groove is formed on the mounting plate for the extension of the execution push rod, a first sealing ring is provided on the mounting plate, and the housing abuts against the first sealing ring to seal one end of the drive cavity. Through the above improvements, an independent drive cavity is provided inside the housing, enclosing the drive wheel assembly inside, providing a clean and sealed working environment for the drive wheel assembly, effectively isolating external dust and moisture erosion, ensuring long-term stable transmission, and the execution groove on the mounting plate precisely guides and limits the extension and retraction movement of the execution push rod, improving the smoothness and reliability of the output action.

[0013] Preferably, a sealing groove is provided on the outer periphery of the lead screw, and a second sealing ring is provided on the sealing groove. The second sealing ring abuts against the inner wall of the drive cavity to seal the other end of the drive cavity. Through the above improvements, the first sealing ring and the second sealing ring seal the drive cavity from both ends, further improving the sealing performance of the drive cavity. The drive cavity provides a closed installation space for the drive wheel assembly, effectively isolating external dust and moisture, and ensuring a clean environment and lubrication effect for the transmission mechanism.

[0014] Preferably, the outer contour of the telescopic section is corrugated along its length, and the sealing base is elastically configured. Through the above improvements, the corrugated outer contour of the telescopic section along its length provides the telescopic section with good telescopic allowance and deformation capability, allowing it to smoothly deform elastically with the reciprocating extension and retraction of the actuator, avoiding tensile resistance or torsional jamming. At the same time, the corrugated surface can effectively block and guide external liquids, improving dynamic waterproof performance. The elastically configured sealing base can generate adaptive compression deformation when the shell and the housing are pressed together, filling the small gaps on the mating surfaces, ensuring that the joint is tightly fitted and reliably sealed, and can compensate for dimensional fluctuations caused by temperature changes or assembly errors, enhancing the sealing stability and vibration resistance reliability during long-term use.

[0015] Preferably, the housing is provided with vent holes and a breathing membrane that covers the vent holes. Through the above improvements, the vent holes and breathing membrane on the housing can achieve pressure balance between the inside and outside of the housing, preventing excessive pressure difference between the inside and outside of the housing due to the heat of the drive motor or changes in ambient temperature, and avoiding failure of the sealing structure due to pressure accumulation. The breathing membrane has good hydrophobic and breathable properties, which can effectively block liquid water and dust particles from entering the housing through the vent holes, ensuring that the waterproof sealing performance is not affected. Thus, it meets the dual requirements of ventilation and heat dissipation and waterproof protection, protects the internal precision components, and extends the service life of the driver.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: A reliable static end-face seal is formed by pressing the sealing base between the housing and the casing mating surface. At the same time, the telescopic section extends and retracts synchronously with the actuator push rod, achieving a dynamic wrapping seal on the actuator push rod. This completely blocks the path of moisture intrusion from both static and dynamic aspects, completely isolating the core transmission components such as the lead screw and drive slider from external moisture, avoiding rust and jamming problems, ensuring long-term operational accuracy and stability, and overcoming the defect of traditional sliding seal rings that wear due to long-term reciprocating friction, which leads to seal failure. This significantly improves the waterproof rating and long-term reliability of the drive in outdoor, humid, and even underwater environments. Furthermore, the sealing tube integrates static and dynamic sealing into a single structure, greatly improving waterproof and dustproof effects and simplifying the assembly process. The sealing tube can be integrally injection molded from rubber or elastomer materials, making disassembly and assembly convenient and facilitating later maintenance and replacement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 This is a cross-sectional view of the drive motor and housing of this utility model. Figure 4 This is a schematic diagram of the internal structure of the housing of this utility model; Figure 5 This is a schematic diagram of the structure of the sealing tube of this utility model; Figure 6 This utility model Figure 2 A magnified view of a section at point A in the middle; Figure 7 This utility model Figure 2 A magnified view of a section at point B in the middle; Figure 8 This utility model Figure 2 A magnified view of a section at point C; Figure 9 This utility model Figure 2 A magnified view of a section at point D; Figure 10 This utility model Figure 2 A magnified view of a section at point E in the middle; In the diagram: 1. Housing; 2. Box body; 3. Lead screw; 4. Drive motor; 5. Drive slider; 6. Actuating push rod; 7. Sealing tube; 8. Rear end cover; 9. Mounting plate; 101. Telescopic section; 102. Sealing base; 201. Snap-fit ​​protrusion; 202. Annular locking platform; 203. Sealing groove; 301. Positioning protrusion; 302. Positioning groove; 303. First sealing gasket; 304. Second sealing gasket; 401. Drive cavity; 402. Drive wheel set; 403. Actuating groove; 501. First sealing ring; 502. Second sealing ring; 503. Sealing groove; 601. Vent hole; 602. Breathing membrane. Detailed Implementation

[0018] 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.

[0019] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0020] like Figures 1 to 5 As shown, a sealed and waterproof PLD driver includes a housing 1 and a box 2 connected to the housing 1. A lead screw 3 is rotatably installed inside the housing 1. A drive motor 4 is installed on the box 2 to drive the lead screw 3 to rotate. A drive slider 5 is threaded on the lead screw 3. The lead screw 3 and the drive slider 5 are threadedly connected. An execution push rod 6 is connected to the drive slider 5. The drive motor 4 drives the lead screw 3 to rotate so that the execution push rod 6 can extend or retract.

[0021] Specifically, a sealing tube 7 is sleeved around the outer periphery of the actuator push rod 6, and the sealing tube 7 includes a telescopic section 101 and a sealing base 102 disposed on the telescopic section 101. The telescopic section 101 and the sealing base 102 are integrally formed. The sealing base 102 is disposed between the joint of the housing 1 and the box 2. The housing 1 and the box 2 respectively abut against the upper and lower end faces of the sealing base 102, and the end of the telescopic section 101 is engaged with the actuating end of the actuator push rod 6 and extends and retracts with the actuator push rod 6.

[0022] The housing 2 includes a transmission mounting part connected to the lead screw 3 and a push rod guide part for the push rod 6 to extend out. The sealing base 102 synchronously seals the connection area between the housing 1 and the transmission mounting part, as well as the connection area between the housing 1 and the push rod guide part, thereby ensuring the sealing of the connection between the housing 2 and the housing 1.

[0023] A reliable static end-face seal is formed by pressing the sealing base 102 between the mating surfaces of the housing 1 and the box 2. At the same time, the telescopic section 101 extends and retracts synchronously with the actuator push rod 6, achieving a dynamic wrapping seal on the actuator push rod 6. This completely blocks the path of moisture intrusion in both static and dynamic aspects, completely isolating the lead screw 3 and the drive slider 5 from external moisture, avoiding corrosion and jamming problems, ensuring long-term operational accuracy and stability, and overcoming the defect of traditional sliding seal rings that fail due to wear caused by long-term reciprocating friction. This significantly improves the waterproof rating and long-term reliability of the drive in outdoor, humid, and even underwater environments. Furthermore, the sealing tube 7 integrates the static and dynamic seals into a single structure, greatly improving the waterproof and dustproof effect and simplifying the assembly process. The sealing tube 7 can be integrally injection molded from rubber or elastomer materials, making disassembly and assembly convenient and facilitating later maintenance and replacement.

[0024] Preferably, the expansion joint 101 and the sealing base 102 are made of rubber material or rubber-coated plastic. Rubber has excellent weather resistance, high elasticity and fatigue resistance, and can maintain stable deformation recovery ability in long-term reciprocating expansion and contraction. It is also resistant to high and low temperatures and ozone aging, effectively extending the dynamic seal life. Rubber-coated plastic can enhance structural strength while ensuring flexibility, further improving the reliability of the integrated seal.

[0025] like Figure 2 , Figure 4 , Figure 5 , Figure 8 As shown, as a further explanation of the embodiment of the sealing tube 7, the outer contour of the telescopic section 101 is corrugated along the length direction, giving the telescopic section 101 good telescopic margin and deformation capability, so that it can smoothly reciprocate and expand with the push rod 6 and elastically deform, avoiding tensile resistance or twisting jamming. At the same time, the corrugated surface can effectively block and guide external liquid, improve dynamic waterproof performance, and the sealing base 102 is elastically set, which can generate adaptive compression deformation when the shell 1 and the box 2 are pressed together, filling the small gaps at the joint, ensuring that the joint is tightly fitted and reliably sealed, and can compensate for dimensional fluctuations caused by temperature changes or assembly errors, enhancing the sealing stability and vibration resistance reliability during long-term use.

[0026] Specifically, the end of the telescopic section 101 is provided with a snap-fit ​​protrusion 201, and the actuator push rod 6 is provided with an annular snap-fit ​​platform 202. The snap-fit ​​protrusion 201 forms a sealing groove 203 for the annular snap-fit ​​platform 202 to be inserted. Through the cooperation of the annular snap-fit ​​platform 202 and the sealing groove 203, the telescopic section 101 and the actuator push rod 6 are reliably snapped and sealed, effectively preventing moisture from seeping in from between the outer periphery of the actuator push rod 6 and the end of the telescopic section 101. At the same time, the snap-fit ​​structure can withstand the axial tension when the push rod reciprocates, preventing the telescopic section 101 from loosening or shifting, ensuring the stability and durability of the sealing structure during long-term use, and is easy to assemble, which is conducive to improving production efficiency.

[0027] In addition, the housing 2 is provided with a positioning protrusion 301, and the sealing base 102 is provided with a positioning groove 302 for the positioning protrusion 301 to be inserted. This enables the sealing base 102 to be quickly and accurately positioned at the joint between the housing 1 and the housing 2, effectively preventing the sealing base 102 from being skewed or misaligned during assembly. This ensures that the housing 1 and the housing 2 are evenly stressed and tightly pressed against the upper and lower end faces of the sealing base 102, thereby significantly improving the sealing reliability of the joint and preventing the sealing base 102 from being displaced under the vibration of the driver or external pressure, ensuring the long-term stability of the sealing performance during long-term use.

[0028] like Figure 1 , Figure 4 , Figure 6 , Figure 7 , Figure 9 , Figure 10 As shown, in a further explanation of the sealing implementation of the housing 1, the end of the housing 1 opposite to the end connected to the housing 2 is connected to a rear end cover 8, and a first sealing gasket 303 is provided between the housing 1 and the rear end cover 8, which can effectively block the path of external moisture and dust from seeping in through the gap between the rear end cover 8 and the housing 1, and significantly improve the overall waterproof level of the driver.

[0029] In another embodiment, the end of the housing 1 that is away from the box 2 can be made sealed to ensure the airtightness of the housing 1.

[0030] Specifically, a second sealing gasket 304 is provided between the drive motor 4 and the housing 2, which can effectively seal the mating gap between the motor mounting surface and the housing 2, prevent external moisture and dust from seeping into the housing 2 along the motor shaft insertion part, and further improve the overall waterproof protection level of the driver.

[0031] Furthermore, a mounting plate 9 is provided at one end of the housing 2, and a drive chamber 401 is provided inside the housing 2. A drive wheel assembly 402 for driving the lead screw 3 to rotate is provided inside the drive chamber 401. An execution groove 403 is formed on the mounting plate 9 for the execution push rod 6 to extend. The drive chamber 401 encloses the drive wheel assembly 402 inside, providing a clean and sealed working environment for the drive wheel assembly 402, effectively isolating it from external dust and moisture erosion, and ensuring long-term stable transmission. The execution groove 403 on the mounting plate 9 provides precise guidance and limit for the extension and retraction movement of the execution push rod 6, improving the smoothness and reliability of the output action.

[0032] The mounting plate 9 is provided with a first sealing ring 501, and the housing 2 abuts against the first sealing ring 501 to seal one end of the drive cavity 401. The outer periphery of the lead screw 3 is provided with a sealing groove 503, and a second sealing ring 502 is provided on the sealing groove 503. The second sealing ring 502 abuts against the inner wall of the drive cavity 401 to seal the other end of the drive cavity 401. The first sealing ring 501 and the second sealing ring 502 seal the drive cavity 401 from both ends, respectively, providing a closed installation space for the drive wheel assembly 402, effectively isolating external dust and moisture, and ensuring a clean environment and lubrication effect for the transmission mechanism.

[0033] In summary, sealing multiple points improves the overall sealing performance of the drive.

[0034] Preferably, the outer contour of the telescopic section 101 abuts against the groove walls at both ends of the execution groove 403 and extends and retracts along the length of the execution groove 403, so that the telescopic section 101 obtains good guidance and radial limitation during the extension and retraction process.

[0035] like Figure 1 , Figure 2 As shown, in some other embodiments, the housing 1 is provided with a vent 601, and the housing 1 is provided with a breathing membrane 602 that covers the vent 601. The vent 601 and the breathing membrane 602 on the housing 1 can achieve pressure balance between the inside and outside of the housing 1, prevent excessive pressure difference between the inside and outside of the housing 1 due to the heat of the drive motor 4 or changes in ambient temperature, and avoid failure of the sealing structure due to pressure accumulation. The breathing membrane 602 has good hydrophobic and breathable properties, which can effectively block liquid water and dust particles from entering the inside of the housing 1 through the vent 601, ensuring that the waterproof sealing performance is not affected. Thus, it meets the dual requirements of ventilation and heat dissipation and waterproof protection, protects the internal precision components, and extends the service life of the driver.

[0036] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A sealed and waterproof PLD driver, comprising a housing (1), a box (2) connected to the housing (1), a lead screw (3) rotatably disposed inside the housing (1), a drive motor (4) for driving the lead screw (3) to rotate disposed on the box (2), a drive slider (5) threadedly disposed on the lead screw (3), an actuator push rod (6) connected to the drive slider (5), the drive motor (4) driving the lead screw (3) to rotate, so that the actuator push rod (6) extends and retracts, characterized in that, The actuator push rod (6) is fitted with a sealing tube (7) on its outer periphery. The sealing tube (7) includes a telescopic section (101) and a sealing base (102) disposed on the telescopic section (101). The sealing base (102) is disposed between the joint of the housing (1) and the box (2). The housing (1) and the box (2) respectively abut against the upper and lower end faces of the sealing base (102). The end of the telescopic section (101) is engaged with the actuator push rod (6) and extends and retracts with the actuator push rod (6).

2. The sealed and waterproof PLD driver according to claim 1, characterized in that: The housing (2) includes a transmission mounting part connected to the lead screw (3) and a push rod guide part for the extension of the push rod (6). The sealing base (102) synchronously seals the connection area between the housing (1) and the transmission mounting part, as well as the connection area between the housing (1) and the push rod guide part.

3. The sealed and waterproof PLD driver according to claim 1, characterized in that: The end of the telescopic section (101) is provided with a snap-fit ​​protrusion (201), the actuating push rod (6) is provided with an annular locking platform (202), and the snap-fit ​​protrusion (201) is provided with a sealing groove (203) for the annular locking platform (202) to be inserted.

4. The sealed and waterproof PLD driver according to claim 1, characterized in that: The housing (2) is provided with a positioning protrusion (301), and the sealing base (102) is provided with a positioning groove (302) for the positioning protrusion (301) to be inserted.

5. A sealed and waterproof PLD driver according to claim 1, characterized in that: The end of the housing (1) opposite to the end connected to the box body (2) is connected to a rear end cover (8), and a first sealing gasket (303) is provided between the housing (1) and the rear end cover (8).

6. A sealed and waterproof PLD driver according to claim 1, characterized in that: A second sealing gasket (304) is provided between the drive motor (4) and the housing (2).

7. A sealed and waterproof PLD driver according to claim 1, characterized in that: The housing (2) has a mounting plate (9) at one end, a drive cavity (401) inside the housing (2), a drive wheel assembly (402) for driving the lead screw (3) to rotate inside the drive cavity (401), an execution groove (403) for the execution push rod (6) to extend on the mounting plate (9), a first sealing ring (501) on the mounting plate (9), and the housing (2) abuts against the first sealing ring (501) to seal one end of the drive cavity (401).

8. A sealed and waterproof PLD driver according to claim 7, characterized in that: The lead screw (3) is provided with a sealing groove (503) on its outer periphery, and a second sealing ring (502) is provided on the sealing groove (503). The second sealing ring (502) abuts against the inner wall of the drive cavity (401) to seal the other end of the drive cavity (401).

9. A sealed and waterproof PLD driver according to claim 1, characterized in that: The outer contour of the telescopic section (101) is corrugated along the length direction, and the sealing base (102) is elastically arranged.

10. A sealed and waterproof PLD driver according to claim 1, characterized in that: The housing (1) is provided with a vent (601), and the housing (1) is provided with a breathing membrane (602) that covers the vent (601).

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