An adjustable limit type quick-opening door driving device

Abstract

The application relates to an adjustable limit type quick-opening door driving device which comprises a motor, a speed reducer and an output shaft rotatingly arranged in the speed reducer, the output shaft is in a tubular hollow structure and is provided with a boss at a lower end, a coil spring is sleeved on the outer periphery of the boss, the boss is provided with a first clamping part for fixing the inner ring end of the coil spring, the inner side of the speed reducer shell is provided with a second clamping part for fixing the outer ring end of the coil spring, and the inner wall of the output shaft is provided with a transmission part for transmitting torque. The specific structure and arrangement mode of the boss, the coil spring and the clamping part are limited. The application cancels the traditional independent shaft sleeve structure through the design of the integrated special-shaped output shaft, simplifies the overall assembly, increases the coil spring mounting space and effective number of turns, thereby improving the spring force and rebound effect, making the stress distribution of the coil spring more uniform, and significantly improving the service life of the motor and the accuracy of door opening and positioning.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to an adjustable limit type quick-opening door drive device. Background Technology

[0002] In the field of automatic door control, the fast-opening door motor is the core driving component that enables the door to open and close quickly and smoothly.

[0003] Currently, most common fast-opening door motors use a traditional cylindrical output shaft for transmission output, along with a separate bushing structure to fix and support the limiting coil spring. This split structure suffers from numerous components, complex assembly, and large internal space occupation. Furthermore, the presence of the bushing limits the number of coil spring turns and effective stroke, resulting in insufficient spring force and unsatisfactory rebound, affecting the door opening and closing response speed and positioning accuracy. In addition, during repeated compression and release, stress concentrates at a few contact points between the bushing and the spring, easily leading to premature spring fatigue failure and shortening the overall lifespan of the motor.

[0004] The aforementioned technologies suffer from drawbacks such as complex structure, limited spring performance, and short service life of existing quick-opening door motors. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this application provides an adjustable limit type quick-opening door drive device. The motor achieves structural simplification, improved spring performance, and extended service life through an integrated tubular hollow structure output shaft design.

[0006] This application is achieved through the following technical solution: An adjustable limit-type quick-opening door drive device includes a motor, a gearbox, and an output shaft rotatably disposed within the gearbox. A transmission gear is keyed to the middle of the output shaft, and torque is transmitted between the output end of the motor and the transmission gear through a plurality of intermediate transmission shaft groups. The output shaft has a tubular hollow structure, and a boss is provided on the lower section of the output shaft. The boss and the output shaft are integrally formed. A coil spring is sleeved on the outer circumference of the boss, and a first locking part for fixing the inner end of the coil spring is provided on the boss. A second locking part for fixing the outer end of the coil spring is provided on the inner side of the gearbox housing. A transmission part for transmitting torque is provided on the inner wall of the output shaft.

[0007] By adopting the above technical solution, the output shaft adopts a tubular hollow integrated structure with an integrated boss in its lower section, replacing the traditional split bushing, significantly reducing the number of parts and simplifying the assembly process; this design provides more installation space for the coil spring, allowing for more effective coils, thereby increasing the spring force and improving the rebound efficiency and door opening and closing response speed; the inner and outer coils of the coil spring are fixed by the first snap-fit ​​part on the output shaft boss and the second snap-fit ​​part on the gearbox housing, respectively, ensuring the stability and reliability of the torque transmission path and making the stress distribution of the coil spring more uniform, effectively extending its service life.

[0008] Optionally, the sidewall of the boss is adapted to the inner ring of the coil spring, and a plurality of flat portions are provided at intervals on the sidewall of the boss.

[0009] By adopting the above technical solution, the spaced flat parts form a non-full circumferential contact with the inner ring of the coil spring, which can effectively transmit torque and provide stress release space when the coil spring is deformed, thereby reducing stress concentration and lowering the risk of spring fatigue.

[0010] Optionally, the upper end of the boss abuts against the transmission gear to limit the transmission gear.

[0011] By adopting the above technical solution, the upper end face of the boss serves as the axial positioning surface of the transmission gear, which simplifies the positioning structure of the transmission gear and ensures the accuracy of the axial assembly of the transmission components.

[0012] Optionally, the first snap-fit ​​portion is provided on the flat portion of the boss.

[0013] By adopting the above technical solution, the flat part provides a stable processing foundation for setting the snap-fit ​​part, which makes it easier to ensure the firmness of the inner ring end of the coil spring.

[0014] Optionally, the first snap-fit ​​portion is a notch provided on the flat portion.

[0015] By adopting the above technical solution, the notch structure is simple, easy to process and manufacture, and matches the shape of the inner ring end of the coil spring, thus achieving reliable snap-fit.

[0016] Optionally, the cross-section of the notch is rectangular.

[0017] By adopting the above technical solution, the contact area between the rectangular notch and the end of the coil spring is large, the fixing force is strong, and it is not easy to come loose, thus improving the stability of the connection.

[0018] Optionally, the outer end of the coil spring is provided with an arc-shaped bend.

[0019] By adopting the above technical solution, the arc-shaped bend can easily cooperate with the snap-fit ​​interface on the gearbox housing to form a smooth transition connection, reduce stress concentration, and facilitate installation and disassembly.

[0020] Optionally, the gearbox housing is provided with a groove for accommodating a coil spring, and the second snap-fit ​​part is a snap-fit ​​interface provided on the side wall of the groove that is adapted to the arc-shaped bend.

[0021] By adopting the above technical solution, the groove provides a stable space for the coil spring, and the locking interface cooperates with the arc bending part of the outer ring of the coil spring, realizing the quick and reliable fixing of the outer ring of the coil spring.

[0022] Optionally, the output shaft has a semi-circular keyway in the middle for engaging with the keyway of the transmission gear.

[0023] By adopting the above technical solution, the semi-circular keyway connecting transmission gear has a compact structure, can transmit a large torque, and is easy to assemble.

[0024] Optionally, the transmission part is a flat keyway.

[0025] By adopting the above technical solution, the flat keyway on the inner wall of the output shaft is used to connect with the external actuator and transmit torque, which is a common and reliable transmission method.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. This application simplifies the overall structure by designing the output shaft as a tubular hollow structure and integrating a boss, eliminating the need for a separate bushing, reducing the number of parts and assembly steps, and providing more space for the coil spring to increase the effective number of coils, thereby improving the spring force and rebound effect, effectively overcoming the problems of insufficient spring force and poor rebound in the prior art.

[0027] 2. This application optimizes the stress distribution of the coil spring by setting the flat part at intervals on the side wall of the boss, reduces stress concentration, and lowers the fatigue risk of the spring; the boss also axially limits the transmission gear, simplifying the structure.

[0028] 3. This application reliably fixes the inner and outer rings of the coil spring by means of the notch-type first snap-fit ​​part on the output shaft boss and the snap-fit ​​interface-type second snap-fit ​​part on the side wall of the housing groove, ensuring the stability of torque transmission; the output shaft realizes the input and output of power through the semi-circular keyway and the inner wall flat keyway, which is compact and efficient in transmission. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of an adjustable limit type quick-opening door drive device as described in the embodiment; Figure 2 This is a schematic diagram of the internal structure of an adjustable limit quick-opening door drive device as described in the embodiment; Figure 3 This is a schematic diagram of the assembly structure of the coil spring described in the embodiment; Figure 4 This is a three-dimensional structural diagram of the assembly of the semi-circular keyway and the transmission gear described in the embodiment; Figure 5 This is a cross-sectional view of the assembly of the semi-circular keyway and the transmission gear described in the embodiment; Figure 6 This is a schematic diagram of the output shaft described in the embodiment; Figure 7 This is a schematic diagram of the groove structure described in the embodiment.

[0030] In the diagram: 1. Motor; 2. Gearbox; 21. Groove; 22. Second snap-fit ​​part; 221. Snap-fit ​​interface; 3. Intermediate transmission shaft assembly; 4. Output shaft; 41. First snap-fit ​​part; 411. Notch; 42. Transmission part; 421. Flat keyway; 43. Boss; 431. Flat part; 44. Semicircular keyway; 5. Coil spring; 51. Arc bend; 6. Transmission gear. Detailed Implementation

[0031] The following will be combined with the appendix Figures 1 to 7 The technical solutions of the various embodiments of this application have been clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] refer to Figures 1 to 3 This application provides an adjustable limit type quick-opening door drive device, including a motor 1, a reduction gearbox 2, and an output shaft 4 rotatably disposed within the reduction gearbox 2. A transmission gear 6 is keyed to the middle of the output shaft 4, and torque is transmitted between the output end of the motor 1 and the transmission gear 6 through a plurality of intermediate transmission shaft groups 3. The output shaft 4 has a tubular hollow structure, and a boss 43 is provided on the lower section of the output shaft 4. The boss 43 and the output shaft 4 are integrally formed. A coil spring 5 is sleeved on the outer circumferential surface of the boss 43, and a first snap-fit ​​part 41 for fixing the inner end of the coil spring 5 is provided on the boss 43. A second snap-fit ​​part 22 for fixing the outer end of the coil spring 5 is provided on the inner side of the housing of the reduction gearbox 2. A transmission part 42 for transmitting torque is provided on the inner wall of the output shaft 4.

[0033] For details, please refer to Figures 3 to 6The output shaft 4 has a tubular hollow structure, which reduces its weight and can also accommodate other components in some special applications. A boss 43 is provided at the lower end of the output shaft 4, and the boss 43 is integral with the output shaft 4, ensuring the connection strength and stability between them. The sidewall of the boss 43 is adapted to the inner ring of the coil spring 5, and several flat portions 431 are spaced apart on the sidewall of the boss 43, facilitating the installation and fixation of the inner ring of the coil spring 5. The upper end of the boss 43 abuts against the transmission gear 6, limiting its movement and preventing axial movement on the output shaft 4.

[0034] For details, please refer to Figure 6 The inner wall of the output shaft 4 is provided with a transmission part 42 for transmitting torque. The transmission part 42 is a flat keyway 421, which can mate with flat keys on other components to achieve torque transmission. For example, when the output shaft 4 needs to be connected to other equipment, the two can be connected together by a flat key to ensure effective power transmission. An alternative feature of the flat keyway 421 can be a spline, which can also achieve torque transmission and has higher load-bearing capacity and transmission accuracy.

[0035] For details, please refer to Figure 4 and Figure 5 The transmission gear 6 is keyed to the middle of the output shaft 4. The middle of the output shaft 4 has a semi-circular keyway 44 for keying with the keyway of the transmission gear 6. The semi-circular keyway 44 engages with the keyway on the transmission gear 6, and the keying is achieved through the semi-circular key. This keying method ensures synchronous rotation between the transmission gear 6 and the output shaft 4. An alternative feature to the semi-circular keyway 44 is a common flat keyway 421. The flat keyway 421 can also achieve keying between the transmission gear 6 and the output shaft 4, but installation and disassembly may be more complex.

[0036] For details, please refer to Figure 3 and Figure 6 A coil spring 5 is sleeved on the outer circumferential surface of a boss 43. The boss 43 has a first engaging portion 41 for fixing the end of the inner coil of the coil spring 5. The first engaging portion 41 is located on the flat portion 431 of the boss 43 and is a notch 411 on the flat portion 431 with a rectangular cross-section. The rectangular notch 411 facilitates the insertion and fixing of the end of the inner coil of the coil spring 5, ensuring a tight connection between the inner coil of the coil spring 5 and the boss 43. An alternative feature of the notch 411 can be a slot, which can also achieve the fixing of the end of the inner coil of the coil spring 5.

[0037] For details, please refer to Figure 3 and Figure 7The gearbox 2 housing has a second locking part 22 inside for fixing the outer end of the coil spring 5. The outer end of the coil spring 5 has an arc-shaped bend 51. The gearbox 2 housing has a groove 21 for accommodating the coil spring 5. The second locking part 22 is a locking interface 221 on the side wall of the groove 21 that matches the arc-shaped bend 51. The cooperation between the arc-shaped bend 51 and the locking interface 221 ensures the fixation of the outer coil spring 5 to the gearbox 2 housing. At the same time, the elasticity of the coil spring 5 can buffer and limit the rotation of the output shaft 4. The locking interface 221 can be replaced by a snap-fit, which can also fix the outer end of the coil spring 5.

[0038] The implementation principle of this embodiment is as follows: The adjustable limit-type quick-opening door drive device of this embodiment effectively solves the problem of difficulty in achieving precise limiting and buffering in quick-opening door applications in the prior art through the design of the hollow output shaft 4 and the coil spring 5. The hollow output shaft 4 reduces its own weight and the load on the motor 1. The coil spring 5 provides buffering and limiting functions for the output shaft 4. When the output shaft 4 rotates, the elastic deformation of the coil spring 5 can absorb energy and play a buffering role. At the same time, the connection between the coil spring 5 and the output shaft 4 and the reduction gearbox 2 can limit the rotation range of the output shaft 4 and achieve precise limiting. This design improves the stability and reliability of the quick-opening door motor 1 in practical applications and has obvious advantages compared with the prior art.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. An adjustable limit-type quick-opening door drive device, comprising a motor (1), a reduction gearbox (2), and an output shaft (4) rotatably disposed within the reduction gearbox (2), wherein a transmission gear (6) is keyed to the middle of the output shaft (4), and torque is transmitted between the output end of the motor (1) and the transmission gear (6) via a plurality of intermediate transmission shaft groups (3), characterized in that, The output shaft (4) has a tubular hollow structure, and the lower section of the output shaft (4) is provided with a boss (43). The boss (43) and the output shaft (4) are integrally formed. A coil spring (5) is sleeved on the outer circumferential surface of the boss (43). A first snap-fit ​​part (41) for fixing the inner end of the coil spring (5) is provided on the boss (43). A second snap-fit ​​part (22) for fixing the outer end of the coil spring (5) is provided on the inner side of the gearbox (2) housing. A transmission part (42) for transmitting torque is provided on the inner wall of the output shaft (4).

2. The adjustable limit type quick-opening door drive device according to claim 1, characterized in that, The sidewall of the boss (43) is adapted to the inner ring of the coil spring (5), and a number of flat portions (431) are provided at intervals on the sidewall of the boss (43).

3. The adjustable limit type quick-opening door drive device according to claim 1, characterized in that, The upper end of the boss (43) abuts against the transmission gear (6) and is used to limit the transmission gear (6).

4. The adjustable limit type quick-opening door drive device according to claim 2, characterized in that, The first snap-fit ​​portion (41) is provided on the flat portion (431) of the boss (43).

5. The adjustable limit type quick-opening door drive device according to claim 4, characterized in that, The first snap-fit ​​portion (41) is a notch (411) provided on the flat portion (431).

6. The adjustable limit type quick-opening door drive device according to claim 5, characterized in that, The cross-section of the notch (411) is rectangular.

7. The adjustable limit type quick-opening door drive device according to claim 1, characterized in that, The outer end of the coil spring (5) is provided with an arc-shaped bend (51).

8. The adjustable limit type quick-opening door drive device according to claim 7, characterized in that, The gearbox (2) housing is provided with a groove (21) for accommodating the coil spring (5), and the second snap-fit ​​part (22) is a snap-fit ​​interface (221) provided on the side wall of the groove (21) and adapted to the arc bend part (51).

9. An adjustable limit type quick-opening door drive device according to claim 1, characterized in that, The output shaft (4) has a semi-circular keyway (44) in the middle for engaging with the keyway of the transmission gear (6).

10. An adjustable limit type quick-opening door drive device according to claim 1, characterized in that, The transmission part (42) is a flat keyway (421).

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