A linear drive actuator with integrated DC motor module

Abstract

The present application belongs to the field of drive actuators, and provides a linear drive actuator with an integrated DC motor module, including a housing, a drive rod, and a drive assembly. The housing forms a receiving cavity and a guide hole connected to the receiving cavity and penetrating the housing; the drive rod passes through the guide hole and extends into the receiving cavity, and the drive rod is also slidably connected to the guide hole and can move relative to the housing along its own axial direction; the drive assembly includes a spiral body and a motor detachably mounted in the receiving cavity, the spiral body forms an internal thread coaxial with the drive rod and is threadedly connected to the drive rod through the internal thread, the spiral body is also connected to the rotor of the motor and can be driven to rotate by the motor, and the axial direction of the internal thread is coaxially arranged with the rotation center axis of the rotor.

Description

Technical Field

[0001] The present application belongs to the field of drive actuators, and in particular to a linear drive actuator with an integrated DC motor module. Background Art

[0002] In the field of automotive technology, actuators are used to control the power source of exhaust gas recirculation valves and electronic control valves. Traditional linear drive actuators usually use motors as power sources, and then use threaded screw drives to convert the motor's rotational motion into the linear motion of the valve stem to open or close the valve and control the valve opening size. Usually, the electronic control unit (ECU) drives the valve stem to the target position through position signal instructions according to the vehicle condition and the preset MAP map, thereby accurately controlling the valve opening. However, most traditional actuators use an integral injection molding housing, and then directly install the rotor and stator in the housing. Not only does the mold have high requirements and complex processes, but the motor performance can only be detected after the entire actuator is assembled, which is not conducive to quality control. In addition, for derivative models, the overall redesign is required, which is not conducive to product platform expansion and has high manufacturing costs. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a linear drive actuator with an integrated DC motor module to solve the technical problems in the prior art that the actuator process is complex, the manufacturing cost is high, and it is not conducive to the platformization of derivative models.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a linear drive actuator with an integrated DC motor module, comprising:

[0005] A shell body, forming a receiving cavity and a guide hole connected to the receiving cavity and penetrating the shell body;

[0006] A driving rod passes through the guide hole and extends into the accommodating cavity. The driving rod is also slidably connected to the guide hole and can move relative to the housing along its own axial direction. The portion of the driving rod located in the accommodating cavity is formed with at least one external thread section;

[0007] A driving assembly, comprising a spiral body and a motor detachably mounted in the accommodating cavity, wherein the spiral body forms an internal thread coaxial with the driving rod and is threadedly connected to a corresponding external thread segment on the driving rod through the internal thread, the spiral body is also connected to a rotor of the motor and can be driven to rotate by the motor, and the axial direction of the internal thread is coaxially arranged with a rotation center axis of the rotor;

[0008] The motor comprises a detachably connected motor housing and a motor end cover;

[0009] The outer wall surface of the spiral body is formed with a plurality of bosses protruding along its radial direction and a collar supported and connected by the bosses;

[0010] The drive assembly also includes a hollow steel sleeve with a plurality of through holes formed on the sleeve. The spiral, the boss and the ring are integrally injection molded from nylon, wherein the spiral is injection molded inside the sleeve, and the ring is injection molded outside the sleeve. The boss is formed when the material fills the through hole during injection molding, and the boss connects the ring, the sleeve and the spiral as a whole.

[0011] Optionally, the housing includes a front housing, a rear housing, a metal wire and an electrode;

[0012] The guide hole is arranged on the front shell body, and a plurality of connecting lugs and a first docking hole for docking with the rear shell body are also formed on the front shell body, and the connecting lugs and the first docking hole are respectively located at the two ends of the front shell body, and a power terminal for docking with an external electrical signal plug connector and a docking ring adapted to the first docking hole and used to be inserted into the first docking hole are formed on the rear shell body, and a docking cone section is formed at the front end of the docking ring table, and the front shell body is also formed with a second docking hole for matching with the outer cylindrical surface of the motor end cover, and the metal wire is used to fuse itself with the docking cone section, the bottom wall and side wall of the first docking hole and the outer cylindrical surface of the motor end cover into one, and the electrode is formed at the end of the metal wire, and a groove connected to the first docking hole and for the electrode to extend is also formed on the side wall of the front shell body used to form the first docking hole.

[0013] Optionally, the driving assembly further comprises a sensor push rod coaxially arranged with the driving rod and abutting against the driving rod, a slider connected to an end of the sensor push rod away from the driving rod, a magnet arranged inside the slider, and a sensor arranged in the rear housing and used for detecting the moving position of the magnet;

[0014] The rear housing also forms a sliding cavity for the sliding block to slide, and the sliding path of the sliding block in the sliding cavity is parallel to the axial direction of the driving rod.

[0015] Optionally, the driving assembly further comprises pillars connected to both sides of the slider and springs coaxially sleeved on the pillars;

[0016] The axial direction of the support is parallel to the axial direction of the driving rod. A spring cavity for accommodating the spring is also formed on the rear housing. Two ends of the spring are respectively in contact with the root of the support and the bottom of the spring cavity.

[0017] Optionally, the driving assembly further comprises a limiting plate which is clamped on the rear housing and is used to limit the sliding block in the sliding cavity;

[0018] The limiting plate is provided with a hole for the sensor push rod to pass through.

[0019] Optionally, a sawtooth-shaped clamping foot is formed on the limiting plate, and a clamping hole for the clamping foot to be inserted into and which is interference-fitted with the clamping foot is formed on the rear shell.

[0020] Optionally, the sleeve is coaxial with the internal thread of the spiral body, the rotor is fixedly sleeved on the sleeve and the collar exposes the outer end of the rotor facing the guide hole, and the sensor push rod passes through the sleeve and abuts against the drive rod.

[0021] Optionally, the drive assembly further comprises a front bearing and a rear bearing coaxially sleeved on the shaft sleeve;

[0022] The front bearing is supported between the shaft sleeve and the motor housing, and the rear bearing is supported between the shaft sleeve and the motor end cover.

[0023] Optionally, the front housing and the motor housing cooperate to form a cavity for accommodating the outer ring of the front bearing, the drive assembly includes a retaining spring arranged between the front housing and the front bearing, the ring is arranged between the front bearing and the motor housing and is coaxial with the sleeve, and the retaining spring and the ring are used to limit the inner ring of the front bearing to the sleeve.

[0024] The beneficial effect of the linear drive actuator with integrated DC motor module in the present application is that: compared with the prior art, in the linear drive actuator provided in the present application, the motor arranged in the accommodating cavity can drive the spiral body connected to the rotor to rotate around the axial direction of the drive rod. Since the spiral body and the drive rod are connected by an internal thread arranged inside the spiral body and the axial direction of the internal thread is coaxially arranged with the drive rod, the drive rod can be driven by the spiral body and guided by the guide hole on the shell. The drive rod can move linearly and stably along its own axial direction relative to the shell. Since the motor is an independent modular structure, it can be conveniently installed inside the shell, and the drive rod is also detachably connected to the motor through the spiral body. Therefore, the linear drive actuator in the present application can be manufactured by mass manufacturing the same standard motor and customizing the shell shape. This can significantly reduce the production cost of the linear drive actuator in the present application, which is far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 The overall structure explosion of the linear drive actuator integrated with the DC motor module in the embodiment of the present application Figure 1 ;

[0027] Figure 2 The overall structure explosion of the linear drive actuator integrated with the DC motor module in the embodiment of the present application Figure 2 ;

[0028] Figure 3 It is a partial structural exploded diagram of a linear drive actuator with an integrated DC motor module in an embodiment of the present application;

[0029] Figure 4 This is a schematic diagram of the main structure of the rear housing in the embodiment of the present application;

[0030] Figure 5 For along Figure 4 The cross-sectional structure diagram along the AA line;

[0031] Figure 6 It is a schematic diagram of the local structure of the driving component in the embodiment of the present application;

[0032] Figure 7 An exploded view of the local structure of the driving component in the embodiment of the present application;

[0033] Figure 8 This is a schematic diagram of the main structure of the linear drive actuator with integrated DC motor module in the embodiment of the present application;

[0034] Fig. 9 For along Figure 8 The cross-sectional structure diagram of the middle BB line;

[0035] Fig.10 For along Fig. 9 Cross-sectional structural diagram of the center CC line;

[0036] Fig.11 This is a schematic diagram of the welding positions of the front housing, rear housing and motor end cover in the embodiment of the present application.

[0037] Among them, the reference numerals in the figure are: 100, shell; 101, accommodating cavity; 102, guide hole; 103, front shell; 104, rear shell; 105, metal wire; 106, electrode; 131, connecting lug; 132, first docking hole; 133, slot; 134, second docking hole; 141, power terminal; 142, docking ring; 143, docking cone section; 144, sliding cavity; 145, spring cavity; 146, clamping hole; 200, driving rod; 301, spiral body; 302, motor; 303, sensor push rod; 304, slider; 305, magnet; 306, sensor; 307, pillar; 308, spring; 309, limit plate; 311, internal thread; 312, boss; 313, bushing; 314, through hole; 321, rotor; 322, motor housing; 323, motor end cover; 324, front bearing; 325, rear bearing; 326, cavity; 327, retaining spring; 328, collar; 391, clamping foot; 400, fastener. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Please also read Figures 1 to 11Now, a linear drive actuator with integrated DC motor 302 module provided in an embodiment of the present application is described. The linear drive actuator includes a housing 100, a drive rod 200 and a drive assembly. Among them:

[0043] The housing 100 forms a receiving chamber 101 and a guide hole 102 connected to the receiving chamber 101 and penetrating the housing 100; the driving rod 200 passes through the guide hole 102 and extends into the receiving chamber 101, the driving rod 200 is also slidably connected to the guide hole 102 and can move relative to the housing 100 along its own axial direction, and the portion of the driving rod 200 located in the receiving chamber 101 is formed with at least one section of external thread segment; the driving assembly includes a spiral body 301 and a motor 302 detachably mounted in the receiving chamber 101, the spiral body 301 forms an internal thread 311 coaxial with the driving rod 200 and is threadedly connected to the corresponding external thread segment on the driving rod 200 through the internal thread 311, the spiral body 301 is also connected to the rotor 321 of the motor 302 and can be driven to rotate by the motor 302, and the axial direction of the internal thread 311 is coaxially arranged with the rotation center axis of the rotor 321; the guide hole 102 is usually a non-circular structure, such as a square cross-section structure, an elliptical cross-section structure, and a structure with a guide rib dividing the entire circle, with emphasis on Figure 1 , Figure 8 , Fig. 9 , Fig.10 As shown, this embodiment adopts a guide hole structure having a plurality of guide ridges protruding from the inner wall of the guide hole 102 and extending axially, and the corresponding driving rod 200 has a guide section and is provided with a guide groove corresponding to the guide ridge;

[0044] The motor 302 includes a motor housing 322 and a motor end cover 323 that are detachably connected.

[0045] A plurality of bosses 312 protruding along the radial direction of the spiral body 301 and a collar 328 supported and connected by the bosses 312 are formed on the outer wall surface of the spiral body 301;

[0046] The drive assembly also includes a shaft sleeve 313 with a hollow structure made of steel, and a plurality of through holes 314 are formed on the shaft sleeve 313. The spiral body 301, the boss 312, and the collar 328 are integrally injection-molded from nylon, wherein the spiral body 301 is injection-molded inside the shaft sleeve 313, and the collar 328 is injection-molded outside the shaft sleeve 313. The boss 312 is formed by filling the through hole 314 with material during injection molding. The boss 312 connects the collar 328, the shaft sleeve 313, and the spiral body 301 as a whole. By integrally injection-molding the spiral body 301, the boss 312, and the collar 328 from nylon, the internal threaded portion of the spiral body 301 has good wear resistance and the effect of reducing friction.

[0047] During injection molding, since the through hole 314 connects the mold cavity for forming the spiral body 301 with the mold cavity for forming the collar 328, the nylon material can fill and pass through the through hole 314 to form the boss 312, the spiral body 301 and the collar 328, so that the spiral body 301, the collar 328 and the sleeve 313 are connected into a firm fitting structure. In this way, on the one hand, the excellent wear resistance of the nylon material and the reduction of friction can improve the smoothness of the movement of the driving rod 200. On the other hand, since the composite structure is formed, the strength of the entire sleeve 313 can be guaranteed, thereby ensuring the stability and service life of the entire actuator. Here, the injection mold and process can adopt the existing technology.

[0048] According to the above structure provided in the present embodiment, in the linear drive actuator provided in the present embodiment, the motor 302 disposed in the accommodating chamber 101 can drive the spiral body 301 connected to the rotor 321 to rotate around the axial direction of the drive rod 200. Since the spiral body 301 and the drive rod 200 are connected by the internal thread 311 disposed inside the spiral body 301 and the axial direction of the internal thread 311 is coaxially arranged with the drive rod 200, the drive rod 200 can be driven by the spiral body 301 and guided by the guide hole 102 on the housing 100. The drive rod 200 can be stably moved linearly along its own axial direction relative to the housing 100. Since the motor 302 in the present embodiment is an independent modular structure, it can be conveniently installed inside the housing 100, and the drive rod 200 is also detachably connected to the motor 302 through the spiral body 301. Therefore, the linear drive actuator in the present embodiment can be manufactured by mass manufacturing the same standard motor 302 and customizing the shape of the housing 100. This can significantly reduce the production cost of the linear drive actuator in the present application, which is far superior to the prior art.

[0049] The housing 100 includes a front housing 103, a rear housing 104, a metal wire 105, and an electrode 106. The guide hole 102 is provided on the front housing 103, and the front housing 103 is also provided with a plurality of connecting lugs 131 and a first docking hole 132 for docking with the rear housing 104. Here, the connecting lugs 131 and the first docking hole 132 are respectively located at two ends of the front housing 103, and the rear housing 104 is provided with a power connection terminal 141 for docking with an external electrical signal plug connector and a docking ring 142 adapted to the first docking hole 132 and used to be inserted into the first docking hole 132. The docking ring 142 A docking cone section 143 is formed at the front end, and the front housing 103 also forms a second docking hole 134 for matching with the outer circumferential surface of the motor end cover 323. The metal wire 105 is used to fuse itself with the docking cone section 143, the bottom wall and side wall of the first docking hole 132 and the outer circumferential surface of the motor end cover 323. The electrode 106 is formed at the end of the metal wire 105. The side wall of the front housing 103 used to form the first docking hole 132 also forms a slot 133 connected to the first docking hole 132 and for the electrode 106 to extend out. In this embodiment, the function of the connecting lug 131 is to connect the linear drive actuator to the target object, and the power terminal 141 provided on the rear housing 104 can supply power to the motor 302 and transmit the electrical signal of the sensor 306 out of the actuator.

[0050] According to the above structure provided in this embodiment, during assembly, the spiral body 301 and the sleeve 313 are first assembled with other parts of the motor such as the rotor 321, the motor housing 322 and the motor end cover 323 to form an independent motor 302 module, and then the external thread section of the driving rod 200 is screwed into the internal thread 311 of the spiral body 301, and then the motor 302 is installed into the front housing 103 so that the guide section of the driving rod 200 is slidably fitted through the guide hole 102, and at least a part of the outer circumferential surface of the motor end cover 323 enters the second docking hole 134, and the motor 302 is locked in the front housing 103 by the fastener 400 axially penetrated on the front housing 103, and the fastener 400 is usually a screw; two metal wires 105 pre-bent into a semicircle are installed in the first docking hole 132 and the electrodes 106 at both ends of each metal wire 105 extend out of the slot 133 to be exposed on the outer wall of the front housing 103; then the rear housing 104 is fastened to the The ring stage 142 is inserted into the first docking hole 132 of the front housing 103 and a preset pressure is applied. At the same time, the electrodes 106 of the two metal wires 105 are connected to an external power supply. The metal wire 105 heats up to melt the cone section 143, the bottom wall and side wall of the first docking hole 132, and the corresponding parts of the outer circumferential surface of the motor end cover 323. After the preset heating time, the power is disconnected to stop heating. In this way, the rear housing 104, the metal wire 105, the motor end cover 323, and the front housing 103 are fused together under pressure, and a firm and stable combination is formed after cooling. Here, the cone section 143 plays a guiding role in the installation of the rear housing 104 into the front housing 103, which facilitates the assembly operation. On the other hand, it is also used to form supplementary materials in the fusion zone, that is, due to the axial pressure applied to the rear housing 104, the melted material of the cone section 143 will be squeezed into the matching gap around the metal wire 105, and a complete sealed connection will be formed after cooling. Therefore, the linear drive actuator provided in this embodiment can maintain a stable use effect for a long time. It should be noted that the assembly process of the motor 302 can adopt the existing technology. It can be understood that in this embodiment, the front housing 103, the motor end cover 323, and the rear housing 104 are all made of plastic materials commonly used in the technical field.

[0051] In another embodiment of the present application, please refer to Figures 1 to 11 The driving assembly also includes a sensor push rod 303 coaxially arranged with the driving rod 200 and abutting against the driving rod 200, a slider 304 connected to the end of the sensor push rod 303 away from the driving rod 200, a magnet 305 arranged inside the slider 304, and a sensor 306 arranged in the rear shell 104 and used for detecting the moving position of the magnet; a sliding cavity 144 for sliding of the slider 304 is also formed on the rear shell 104, and the sliding path of the slider 304 in the sliding cavity 144 is parallel to the axial direction of the driving rod 200.

[0052] According to the above structure provided in this embodiment, the sensor push rod 303 abutting against the driving rod 200 can be driven and moved by the driving rod 200, because the push rod is connected to the slider 304 and the slider 304 is provided with a magnet 305. Therefore, the sensor 306 provided on the rear housing 104 can obtain the moving position signal of the driving rod 200 by detecting the moving position signal of the magnet 305, which is conducive to achieving a more precise adjustment effect of the linear drive actuator in this embodiment. In addition, since the rear housing 104 is also provided with a sliding cavity 144 for the slider 304 to move, the sliding cavity 144 can also provide a guiding effect for the slider 304 and make the detection accuracy of the sensor 306 higher.

[0053] In another embodiment of the present application, please refer to Figures 1 to 11 The driving assembly also includes a support 307 connected to both sides of the slider 304 and a spring 308 coaxially sleeved on the support 307; the axial direction of the support 307 is parallel to the axial direction of the driving rod 200, and a spring cavity 145 for accommodating the spring 308 is formed on the rear housing 104, and the two ends of the spring 308 are respectively abutted against the root of the support 307 and the bottom of the spring cavity 145. According to the above structure provided in this embodiment, the spring 308 sleeved on the support 307 and the two ends are respectively abutted against the root of the support 307 and the bottom of the spring cavity 145 can make the sensor push rod 303 always abut against the adjacent end of the driving rod 200 to eliminate the gap, improve the synchronization of the movement of the sensor push rod 303 and the driving rod 200, and then ensure the accuracy of the sensor 306 when measuring the position of the driving rod 200, so that the linear drive actuator provided in this embodiment has reliable use accuracy. In addition, the spring cavity 145 formed on the rear housing 104 in this embodiment can also serve as a guide structure for the spring 308 to make the deformation process of the spring 308 more stable.

[0054] In another embodiment of the present application, please refer to Figures 1 to 11 The drive assembly also includes a limit plate 309 that is clamped on the rear housing 104 and is used to limit the slider 304 in the sliding cavity 144; the limit plate 309 is provided with a hole for the sensor push rod 303 to pass through. According to the above structure provided in this embodiment, the limit plate 309 clamped on the rear housing 104 can well limit the slider 304 in the sliding cavity 144 without affecting the movement of the sensor push rod 303, thereby avoiding interference between the sensor push rod 303 and the rotor 321. This is conducive to the stable use of the linear drive actuator provided in this embodiment for a longer period of time. In addition, the clamping of the limit plate 309 and the rear housing 104 with each other is also conducive to the convenience of assembling the linear drive actuator in this embodiment.

[0055] In another embodiment of the present application, please refer to Figures 1 to 11, a sawtooth-shaped clamping foot 391 is formed on the limiting plate 309, and a clamping hole 146 is formed on the rear housing 104 for the clamping foot 391 to be inserted into and is interference-fitted with the clamping foot 391. According to the above structure provided in this embodiment, the sawtooth-shaped clamping foot 391 formed on the limiting plate 309 can be more stably clamped in the clamping hole 146 adapted to its shape, which is conducive to a more stable connection between the limiting plate 309 and the rear housing 104.

[0056] In another embodiment of the present application, please refer to Figures 1 to 11 The shaft sleeve 313 is coaxial with the internal thread 311 of the spiral body 301, the rotor 321 is fixedly sleeved on the shaft sleeve 313 and the collar 328 exposes the outer end of the rotor 321 facing the guide hole 102, and the sensor push rod 303 passes through the shaft sleeve 313 and abuts against the driving rod 200. According to the above structure provided in this embodiment, as mentioned above, the spiral body 301 and the shaft sleeve 313 can be made of two different materials. For example, in the actual production process, the threaded body used for threaded connection with the drive rod 200 can be made of nylon material with good wear resistance to ensure smooth thread fit, and the sleeve 313 can be formed of high-strength steel material to ensure that the sleeve 313 has sufficient strength as the rotating shaft of the rotor 321. The boss 312 formed on the spiral body 301 can maintain a precise relative position relationship between the two during the forming process, which is conducive to further reducing the manufacturing cost of the linear drive actuator in this embodiment and ensuring performance. Here, the sleeve 313 and the rotor 321 can be connected as a whole by pressing or injection molding. That is, the stacked silicon steel sheets can be pressed onto the sleeve 313 in a tight fit to set the position to form a rotor component, or the stacked silicon steel sheets and the sleeve 313 can be placed in a matching injection mold for positioning, and then the two are joined as one through an injection molding process.

[0057] In another embodiment of the present application, please refer to Figures 1 to 11 The drive assembly further includes a front bearing 324 and a rear bearing 325 coaxially sleeved on the sleeve 313; the front bearing 324 is supported between the sleeve 313 and the motor housing 322, and the rear bearing 325 is supported between the sleeve 313 and the motor end cover 323. According to the above structure provided in this embodiment, the front bearing 324 and the rear bearing 325 can keep the sleeve 313 and the rotor 321 rotating more stably, which is conducive to the stable use of the linear drive actuator provided in this embodiment for a longer period of time.

[0058] In another embodiment of the present application, please refer to Figures 1 to 11, the front housing 103 and the motor housing 322 cooperate to form a cavity 326 for accommodating the outer ring of the front bearing 324, the drive assembly includes a retaining spring 327 disposed between the front housing 103 and the front bearing 324, a collar 328 disposed between the front bearing 324 and the motor housing 322 and coaxial with the shaft sleeve 313, and the retaining spring 327 and the collar 328 are used to limit the inner ring of the front bearing 324 to the shaft sleeve 313. According to the above structure provided in this embodiment, the retaining spring 327 can cooperate with the collar 328 to stabilize the front bearing 324 in the cavity 326 formed by the front housing 103 and the motor housing 322.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A linear drive actuator with integrated DC motor module, characterized in that: include: A housing (100) is formed with a receiving cavity (101) and a guide hole (102) connected to the receiving cavity (101) and penetrating the housing (100); a driving rod (200) passing through the guide hole (102) and extending into the accommodating cavity (101); the driving rod (200) is also slidably connected to the guide hole (102) and is movable relative to the housing (100) along its own axial direction; and a portion of the driving rod (200) located in the accommodating cavity (101) is formed with at least one external thread section; A drive assembly, comprising a spiral body (301) and a motor (302) detachably mounted in the accommodating cavity (101), the spiral body (301) forming an internal thread (311) coaxial with the drive rod (200) and being threadedly connected to a corresponding external thread segment on the drive rod (200) via the internal thread (311), the spiral body (301) also being connected to a rotor (321) of the motor (302) and capable of being driven to rotate by the motor (302), the axial direction of the internal thread (311) being coaxially arranged with a rotation center axis of the rotor (321); The motor (302) comprises a detachably connected motor housing (322) and a motor end cover (323); A plurality of bosses (312) protruding along the spiral body (301) radially and a collar (328) supported and connected by the bosses (312) are formed on the outer wall surface of the spiral body (301); The drive assembly further comprises a shaft sleeve (313) with a hollow structure made of steel, the shaft sleeve (313) being provided with a plurality of through holes (314), the spiral body (301), the boss (312) and the collar (328) being integrally injection-molded from nylon, wherein the spiral body (301) is injection-molded inside the shaft sleeve (313), the collar (328) is injection-molded outside the shaft sleeve (313), the boss (312) is formed by the material filling the through holes (314) during the injection molding, and the boss (312) connects the collar (328), the shaft sleeve (313) and the spiral body (301) as a whole; The housing (100) comprises a front housing (103), a rear housing (104), a metal wire (105), and an electrode (106); The guide hole (102) is arranged on the front shell (103); the front shell (103) is further formed with a plurality of connecting lugs (131) and a first docking hole (132) for docking with the rear shell (104); the connecting lugs (131) and the first docking hole (132) are respectively located at two ends of the front shell (103); the rear shell (104) is formed with a power connection terminal (141) for docking with an external electrical signal plug connector and a docking ring (142) adapted to the first docking hole (132) and used to be inserted into the first docking hole (132); the front end of the docking ring (142) is shaped The front housing (103) further forms a second docking hole (134) for mating with the outer circumferential surface of the motor end cover (323); the metal wire (105) is used to weld itself to the docking cone section (143), the bottom wall and side wall of the first docking hole (132) and the outer circumferential surface of the motor end cover (323) as one body; the electrode (106) is formed at the end of the metal wire (105); and the side wall of the front housing (103) for forming the first docking hole (132) further forms a slot (133) connected to the first docking hole (132) and for the electrode (106) to extend out.

2. The linear drive actuator with integrated DC motor module as claimed in claim 1, characterized in that: The driving assembly further comprises a sensor push rod (303) coaxially arranged with the driving rod (200) and abutting against the driving rod (200), a slider (304) connected to an end of the sensor push rod (303) away from the driving rod (200), a magnet (305) arranged inside the slider (304), and a sensor (306) arranged in the rear housing (104) and used to detect the moving position of the magnet (305); The rear housing (104) also forms a sliding cavity (144) for the sliding block (304) to slide, and a sliding path of the sliding block (304) in the sliding cavity (144) is parallel to the axial direction of the driving rod (200).

3. The linear drive actuator with integrated DC motor module as claimed in claim 2, characterized in that: The driving assembly further comprises pillars (307) connected to both sides of the slider (304) and springs (308) coaxially sleeved on the pillars (307); The axial direction of the support (307) is parallel to the axial direction of the driving rod (200), and a spring cavity (145) for accommodating the spring (308) is also formed on the rear housing (104), and two ends of the spring (308) are respectively abutted against the root of the support (307) and the bottom of the spring cavity (145).

4. The linear drive actuator with integrated DC motor module as claimed in claim 3, characterized in that: The driving assembly further comprises a limiting plate (309) which is clamped on the rear housing (104) and is used to limit the sliding block (304) in the sliding cavity (144); The limiting plate (309) is provided with a hole for the sensor push rod (303) to pass through.

5. The linear drive actuator with integrated DC motor module as claimed in claim 4, characterized in that: A sawtooth-shaped clamping foot (391) is formed on the limiting plate (309), and a clamping hole (146) is formed on the rear shell body (104) for the clamping foot (391) to be inserted into and is interference-fitted with the clamping foot (391).

6. The linear drive actuator with integrated DC motor module as claimed in claim 2, characterized in that: The shaft sleeve (313) is coaxial with the internal thread (311) of the spiral body (301); the rotor (321) is fixedly sleeved on the shaft sleeve (313) and the collar (328) exposes the outer end of the rotor (321) facing the guide hole (102); and the sensor push rod (303) passes through the shaft sleeve (313) and abuts against the drive rod (200).

7. The linear drive actuator with integrated DC motor module as claimed in claim 6, characterized in that: The drive assembly further comprises a front bearing (324) and a rear bearing (325) coaxially sleeved on the shaft sleeve (313); The front bearing (324) is supported between the shaft sleeve (313) and the motor housing (322), and the rear bearing (325) is supported between the shaft sleeve (313) and the motor end cover (323).

8. The linear drive actuator with integrated DC motor module as claimed in claim 7, characterized in that: The front housing (103) and the motor housing (322) cooperate to form a cavity (326) for accommodating the outer ring of the front bearing (324); the drive assembly comprises a retaining spring (327) arranged between the front housing (103) and the front bearing (324); the sleeve (328) is arranged between the front bearing (324) and the motor housing (322) and is coaxial with the shaft sleeve (313); the retaining spring (327) and the sleeve (328) are used to limit the inner ring of the front bearing (324) to be located on the shaft sleeve (313).

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