Gear assembly and steering gear

Abstract

The utility model relates to gear assembly field's gear assembly and steering engine, including power output gear and multiple gear groups, the transmission connection of multiple gear groups is engaged by the gear of different sizes between, multiple gear groups gear group includes transmission connection in proper order primary gear group, secondary gear group, tertiary gear group and four gear group, primary gear group includes first driving gear and first driven gear, and the installation end is formed on first driven gear, and the bottom of installation end forms has reinforced boss, the utility model primary gear group sets up through the co - injection integrated setting of support portion, installation end, butt -joint bulge and reinforced bulge, ensures first driving gear and first driven gear connection intensity to improve the stability and reliability of torque transmission, and simultaneously, first driving gear is constituted by soft plastic, increases the stillness when engaging rotation transmission, makes it combine the interval recess and interval boss of adjacent gear piece and reduces the end face friction noise when high -speed engaging rotation, promotes the equipment stillness.

Description

Technical Field

[0001] This utility model relates to the field of gear assemblies, specifically to gear assemblies and servo motors. Background Technology

[0002] Gear assemblies are widely used as transmission mechanisms in servo motors and various mechanical equipment. In servo motor systems, gear assemblies play a crucial role in converting the rotational motion of the motor into precise angle control of the output shaft. Their performance directly affects the motion accuracy, response speed, and reliability of the equipment.

[0003] Traditional gear assemblies typically consist of multiple gears meshing through shaft holes. The gears are usually arranged coaxially or parallel to each other, and power is transmitted through meshing. The basic structure includes the gear body, shaft hole, tooth profile, and necessary supporting components. Chinese Patent CN 211550403 U discloses a gear transmission mechanism for a servo motor and the servo motor itself. Through the distribution and arrangement of the gear sets, a series of improvements and designs were made to the overall shape and internal structure of the servo motor's gear transmission mechanism, increasing its structural compactness and making the overall servo motor compact, occupying less space, and reducing wasted space.

[0004] However, existing gear assemblies still suffer from the following technical defects in practical applications: First, due to the direct meshing of metal tooth surfaces during gear transmission, vibration and noise caused by tooth surface friction and collision affect the quietness of the equipment under high-speed or high-load conditions; second, gear shaft mounting structures often employ through-hole fits or single-sided positioning, which can easily lead to axial movement or radial wobble under complex operating conditions, resulting in decreased transmission system stability; third, the rigid contact between the axial end faces of adjacent gears, with traditional smooth surface designs, exacerbates surface wear and increases transmission resistance under long-term rotational contact. Therefore, it is urgent to solve technical problems such as gear transmission quietness, gear shaft mounting stability, and gear end face friction control through structural innovation. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned deficiencies by providing a gear assembly and a servo motor to solve the technical problems in the background art of how to improve the precision of gear assembly transmission and enhance the stability and service life of gear installation and transmission.

[0006] The objective of this utility model is achieved through the following means:

[0007] The gear assembly includes a power output gear and multiple gear sets, which are connected by meshing gears of different sizes. The multiple gear sets include a first-stage gear set, a second-stage gear set, a third-stage gear set, and a fourth-stage gear set that are connected in sequence.

[0008] The first-stage gear set includes a first driving gear and a first driven gear;

[0009] The two-stage gear set includes a second driving gear and a second driven gear;

[0010] The three-stage gear set includes a third driving gear and a third driven gear;

[0011] The four-stage gear set includes a fourth driving gear and a fourth driven gear, with the fourth driven gear meshing with the power output gear for transmission.

[0012] A support portion is formed on the first driven gear. An installation end connected to the first driving gear is formed at the end of the support portion away from the first driven gear. A first clearance groove that sinks downward along the axial direction is formed on the installation end. A mating protrusion is formed on the top of the installation end. An installation hole that is coaxially matched with the installation end is provided in the first driving gear. A mating hole communicating with the installation hole is also provided on the first driving gear. A plurality of reinforcing bosses distributed circumferentially are formed at the bottom of the installation end. A reinforcing groove that matches the reinforcing bosses is formed on the installation hole. The first driven gear is matched with the installation hole of the first driving gear through the installation end and is integrally formed by co-injection molding. A spacer groove is provided between adjacent driving gears and driven gears. A raised spacer boss is provided on the spacer groove.

[0013] Furthermore, as described above, the first driving gear is made of soft plastic, and the first driven gear is made of hard plastic.

[0014] By combining a soft first driving gear with a hard first driven gear, the energy absorption and vibration reduction characteristics of the soft material are utilized during the meshing transmission of the first driving gear to effectively reduce the vibration noise generated by the direct collision of metal tooth surfaces under high-speed / high-load conditions. At the same time, the hard first driven gear can ensure transmission rigidity, achieving a balance between quietness and load-bearing capacity.

[0015] Furthermore, as described above, the first-stage gear set, the second-stage gear set, and the third-stage gear set are all configured as double gears.

[0016] The double gear structure reduces the number of gears and assembly clearance by coaxially integrating the driving and driven gear units, thereby improving the compactness of the transmission system; in conjunction with the subsequent optical shaft positioning structure, it enhances transmission stability.

[0017] Furthermore, as described above, the first-stage gear set also includes a first optical shaft, with a first driving gear and a first driven gear coaxially connected to the first optical shaft, such that the end of the first optical shaft is exposed through a first clearance groove, and a first protrusion is provided at the end of the first driven gear away from the first driving gear.

[0018] The first clearance groove forms an axial positioning step to increase the support and positioning of the exposed end of the first optical shaft, ensuring the space for the installation support of the first optical shaft, thereby enhancing the stability and reliability of the installation of the first optical shaft, and enabling the first driving gear and the first driven gear on the first optical shaft to output greater torque.

[0019] Furthermore, as described above, the secondary gear set also includes a second optical shaft, and a second driving gear, a second driven gear, a fourth driving gear, and a fourth driven gear are coaxially connected to the second optical shaft in sequence. The bottom of the second driving gear is provided with a second clearance groove for avoiding the second optical shaft, and the bottom of the fourth driving gear is provided with a fourth clearance groove. The interior of the fourth clearance groove forms a fourth protrusion that contacts the end of the second driven gear.

[0020] The fourth clearance groove and the fourth protrusion form an axial limiting step, which, together with the gear set integrated design on the second optical shaft, achieves precise axial positioning of each gear in the secondary gear set. The setting of the second clearance groove provides a larger installation support space for the second optical shaft, which enhances the stability and reliability of the installation of the second optical shaft, and enables the second driving gear, the second driven gear, the fourth driving gear, and the fourth driven gear on the second optical shaft to output greater torque.

[0021] The fourth protrusion contacts the end of the second driven gear to form axial support. At the same time, the fourth clearance groove and the fourth protrusion reduce friction and wear and rotational resistance with the end face of the second driven gear.

[0022] Furthermore, as described above, the three-stage gear set also includes a third optical shaft, a third driving gear, a third driven gear, and a power output gear coaxially connected to the third optical shaft, and a third clearance groove for avoiding the third optical shaft is provided at the bottom of the third driving gear, and a third protrusion is formed inside the third clearance groove.

[0023] The third clearance groove and the third protrusion work together to provide a larger installation support space for the third optical shaft, which enhances the stability and reliability of the installation of the third optical shaft, and allows the third driving gear and the third driven gear on the third optical shaft to output greater torque, improve transmission stability and extend service life.

[0024] Furthermore, as described above, the power output gear has a clearance groove at its end near the third driven gear, and a clearance protrusion is formed in the clearance groove to contact the end of the third driven gear.

[0025] The avoidance protrusion forms a point contact support with the end of the third driven gear. By setting the avoidance groove and the avoidance protrusion, the friction area with the end face of the third driven gear is reduced while ensuring axial positioning, thereby reducing surface wear and transmission resistance under the rotational contact of the power output gear.

[0026] The servo motor includes a gear assembly, a servo motor output shaft, a drive motor, and a PCB board. The output shaft of the drive motor is connected to a drive gear, which meshes with a first drive gear. A connecting hole is formed on the power output gear. The inner wall of the connecting hole is alternately provided with multiple connecting grooves and transition arc-shaped protrusions along the circumferential direction. The servo motor output shaft passes through the connecting hole through an elastic clutch. The outer side of the elastic clutch is provided with a meshing part that selectively meshes with the multiple connecting grooves. The meshing part includes a first set of meshing parts and a second set of meshing parts, which are arranged in a cross shape.

[0027] By alternately arranging connecting grooves and transition arc-shaped protrusions on the inner wall of the connecting hole, and cooperating with the cross-shaped meshing parts on the outer side of the elastic clutch, a multi-directional force support structure is formed.

[0028] Furthermore, the elastic clutch is provided with a first set of deformation holes and a second set of deformation holes inside. The first set of deformation holes and the second set of deformation holes are respectively distributed opposite to the first set of engagement parts and the second set of engagement parts. The first set of deformation holes and the second set of deformation holes each include two through holes, a first waist hole and a second waist hole.

[0029] The symmetrical distribution of the first set of deformation holes (corresponding to the first set of engagement parts) and the second set of deformation holes (corresponding to the second set of engagement parts) allows the elastic clutch to generate controllable elastic deformation under stress. The relative distribution of the two sets of deformation holes and engagement parts ensures uniform stress distribution within the sleeve, avoiding the elastic force attenuation problem caused by the enlarged contact surface in traditional single-set deformation grooves. This structure, while ensuring sufficient engagement contact pressure, optimizes elastic recovery performance through the design of multiple sets of deformation holes, reducing elastic force attenuation after long-term use, maintaining stable clutch contact pressure, and preventing clutch failure.

[0030] The beneficial effects of this utility model are as follows: By using the spacer groove and spacer boss structure between adjacent gears, the rigid contact surface of the smooth end face of the traditional gear set is effectively reduced, thereby reducing contact surface friction and vibration. At the same time, the contact surface area and transmission resistance are reduced, extending the service life of the gear assembly. Combined with the reinforced boss and reinforced groove matching design adopted at the mounting end of the first driving gear and the first driven gear, precise axial positioning and radial limiting are achieved. The co-injection molding process of the reinforced bosses distributed circumferentially at the bottom of the first driving gear and the reinforced grooves in the mounting hole ensures the connection strength of the first driving gear and the first driven gear, thereby improving the stability and reliability of torque transmission. At the same time, the first driving gear is made of soft plastic, which increases the quietness during meshing rotation transmission. Combined with the spacer groove and spacer boss of the adjacent gear parts, it reduces the end face friction noise during high-speed meshing rotation, improving the quietness of the equipment. Attached Figure Description

[0031] Figure 1This is a top-view structural diagram of Embodiment 1;

[0032] Figure 2 This is a schematic diagram of the structure from a low angle in Embodiment 1;

[0033] Figure 3 This is a side view of Embodiment 1;

[0034] Figure 4 This is a top-view structural exploded view of Embodiment 1.

[0035] Figure 5 This is a structural exploded view from a low angle in Embodiment 1.

[0036] Figure 6 This is a schematic diagram of the structure of Embodiment 2;

[0037] Figure 7 This is a schematic diagram of the power output gear, servo output shaft, and elastic clutch in Embodiment 2.

[0038] Figure 8 This is a planar schematic diagram of the power output gear, the servo motor output shaft, and the elastic clutch in Embodiment 2.

[0039] The reference numerals in the figure are as follows:

[0040] 10-Power output gear, 11-Avoidance groove, 12-Avoidance protrusion, 13-Connecting hole, 14-Connecting groove part, 15-Transition arc-shaped protrusion part;

[0041] 20-First stage gear set, 21-First driving gear, 211-Mating hole, 212-Mounting hole, 213-Reinforcing groove, 22-First driven gear, 221-Support part, 222-Mounting end, 223-First clearance groove, 224-Mating protrusion, 225-First protrusion, 226-Reinforcing boss, 23-First optical shaft;

[0042] 30 - Secondary gear set, 31 - Second driving gear, 311 - Second clearance groove, 32 - Second driven gear, 33 - Second optical shaft;

[0043] 40 - Third-stage gear set, 41 - Third driving gear, 411 - Third clearance groove, 412 - Third protrusion, 42 - Third driven gear, 43 - Third optical shaft;

[0044] 50 - Fourth gear set, 51 - Fourth driving gear, 511 - Fourth clearance groove, 512 - Fourth protrusion, 52 - Fourth driven gear;

[0045] 60 - Servo output shaft;

[0046] 70-Elastic clutch element, 71-Sleeve portion, 72-Connecting portion, 73-First arc-shaped protrusion, 74-Second arc-shaped protrusion, 75-Transition groove portion, 76-First set of deformation holes, 77-Second set of deformation holes;

[0047] 80 - Drive motor, 90 - Drive gear, 100 - PCB board. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0049] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0050] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] Example 1

[0052] In this embodiment, refer to Figures 1-5 The gear assembly specifically implemented therein includes a power output gear 10 and multiple gear sets, which are connected by gears of different sizes through meshing transmission. The multiple gear sets include a first-stage gear set 20, a second-stage gear set 30, a third-stage gear set 40 and a fourth-stage gear set 50 that are connected in sequence through transmission.

[0053] The first-stage gear set 20 includes a first driving gear 21 and a first driven gear 22;

[0054] The secondary gear set 30 includes a second driving gear 31 and a second driven gear 32;

[0055] The three-stage gear set 40 includes a third driving gear 41 and a third driven gear 42;

[0056] The fourth gear set 50 includes a fourth driving gear 51 and a fourth driven gear 52, with the fourth driven gear 52 meshing and driving with the power output gear 10.

[0057] A support portion 221 is formed on the first driven gear 22. An installation end 222 connected to the first driving gear 21 is formed at the end of the support portion 221 away from the first driven gear 22. A first relief groove 223 is formed on the installation end 222 that is recessed along the axial direction. A mating protrusion 224 is formed on the top of the installation end 222. An installation hole 212 coaxially paired with the installation end 222 is provided in the first driving gear 21. A mating hole 211 communicating with the installation hole 212 is also provided on the first driving gear 212. A plurality of reinforcing bosses 226 are formed circumferentially distributed at the bottom of the installation end 222. A reinforcing groove 213 paired with the reinforcing bosses 226 is formed on the installation hole 212. The first driven gear is mated with the installation hole 212 of the first driving gear through the installation end 222 and integrally formed by co-injection molding. A spacer groove is provided between adjacent driving gears and driven gears. A raised spacer boss is provided on the spacer groove.

[0058] Specifically, the first, second, third, and fourth gear sets 50 all extend axially parallel to form three rows of gear sets. The gears in each row are coaxially connected via optical shafts. At the same time, the fourth gear set 50 and the second gear set 30 are coaxially connected in the same row via the second optical shaft 33. Through the hierarchical design of the first, second, and third gear sets 40 sequentially driving and connecting, combined with the precise meshing of the driving and driven gears in each gear set, and the direct meshing structure between the power output gear 10 and the fourth driven gear 52, a multi-stage transmission path with precise coordination is formed, effectively controlling transmission errors and improving the precision of the overall transmission system.

[0059] The first driving gear 21 is made of soft plastic, and the first driven gear 22 is made of hard plastic.

[0060] By combining the soft first driving gear 21 with the hard first driven gear 22, the energy absorption and vibration reduction characteristics of the soft material are utilized during the meshing transmission of the first driving gear 21 to effectively reduce the vibration noise generated by the direct collision of metal tooth surfaces under high-speed / high-load conditions. At the same time, the hard first driven gear 22 can ensure transmission rigidity, achieving a balance between quietness and load-bearing capacity.

[0061] Specifically, as an example, the first driving gear 21 is made of polyurethane (PU) material, and the first driven gear 22 is made of polyoxymethylene (POM) material. The connection between the first driving gear 21 and the first driven gear 22 is achieved by a co-injection molding process, and the connection strength is enhanced by the interlocking structure of the reinforcing boss 226 and the reinforcing groove 213, thereby improving the structural reliability.

[0062] The first-stage gear set 20, the second-stage gear set 30, and the third-stage gear set 40 are all configured as double gears.

[0063] The double gear structure reduces the number of gears and assembly clearance by coaxially integrating the driving and driven gear units, thereby improving the compactness of the transmission system; in conjunction with the subsequent optical shaft positioning structure, it enhances transmission stability.

[0064] The first-stage gear set 20 also includes a first optical shaft 23, a first driving gear 21 and a first driven gear 22 are coaxially connected to the first optical shaft 23, so that the end of the first optical shaft 23 is exposed through the first clearance groove 223, and the end of the first driven gear 22 away from the first driving gear 21 is provided with a first protrusion 225.

[0065] The first clearance groove 223 forms an axial positioning step to increase the support positioning of the exposed end of the first optical shaft 23, ensuring the space for the installation support of the first optical shaft 23, thereby enhancing the stability and reliability of the installation of the first optical shaft 23, and enabling the first driving gear 21 and the first driven gear 22 on the first optical shaft 23 to output greater torque.

[0066] The secondary gear set 30 also includes a second optical shaft 33. The second driving gear 31, the second driven gear 32, the fourth driving gear 51 and the fourth driven gear 52 are coaxially connected to the second optical shaft 33 in sequence. The bottom of the second driving gear 31 is provided with a second clearance groove 311 for avoiding the second optical shaft 33. The bottom of the fourth driving gear 51 is provided with a fourth clearance groove 511. The interior of the fourth clearance groove 511 forms a fourth protrusion 512 that contacts the end of the second driven gear 32.

[0067] The fourth clearance groove 511 and the fourth protrusion 512 form an axial limiting step, which, together with the gear set integrated design on the second optical shaft 33, achieves precise axial positioning of each gear in the second-stage gear set 30. The setting of the second clearance groove 311 provides the second optical shaft 33 with a larger installation support space, which can enhance the stability and reliability of the installation of the second optical shaft 33, and enable the second driving gear 31 and the second driven gear 32, as well as the fourth driving gear 51 and the fourth driven gear 52 on the second optical shaft 33, to output greater torque.

[0068] The fourth protrusion 512 contacts the end of the second driven gear 32 to form axial support. At the same time, the fourth clearance groove 511 and the fourth protrusion 512 reduce friction and wear and rotational resistance with the end face of the second driven gear 32, reduce the friction surface and improve the quietness of the rotary transmission.

[0069] The three-stage gear set 40 also includes a third optical shaft 43, a third driving gear 41, a third driven gear 42, and a power output gear 10 coaxially connected to the third optical shaft 43. The bottom of the third driving gear 41 is provided with a third clearance groove 411 for avoiding the third optical shaft 43, and a third protrusion 412 is formed inside the third clearance groove 411.

[0070] The third clearance groove 411 and the third protrusion 412 work together to provide a larger installation support space for the third optical shaft 43, thereby enhancing the stability and reliability of the installation of the third optical shaft 43. This allows the third driving gear 41 and the third driven gear 42 on the third optical shaft 43 to output greater torque, improving transmission stability and extending service life.

[0071] The power output gear 10 has a clearance groove 11 at the end near the third driven gear 42, and a clearance protrusion 12 is formed in the clearance groove 11 to contact the end of the third driven gear 42.

[0072] The avoidance protrusion 12 forms a point contact support with the end of the third driven gear 42. By setting the avoidance groove 11 and the avoidance protrusion 12, the friction area with the end face of the third driven gear 42 is reduced while ensuring axial positioning, thereby reducing surface wear and transmission resistance under the rotational contact of the power output gear 10.

[0073] The specific operating principle in this embodiment is as follows:

[0074] The power of the gear assembly is transmitted from the first driving gear 21 on the first stage gear set 20 to the first driven gear 22, which in turn transmits the power to the second stage gear set 30 and the third stage gear set 40, and then outputs it through the power output gear 10. Specifically, under the drive of an external power source, the first driving gear 21 transmits the power in sequence through the first driven gear 22, the second driving gear 31, the second driven gear 32, the third driving gear 41, the third driven gear 42, the fourth driving gear 51, and the fourth driven gear 52, and then to the power output gear 10.

[0075] Example 2

[0076] In this embodiment, refer to Figures 6-8 The servo motor specifically implemented therein includes a gear assembly, a servo motor output shaft 60, a drive motor 80, and a PCB board 100. The output shaft of the drive motor 80 is connected to a drive gear 90, which meshes with a first drive gear 21. A connecting hole 13 is formed on the power output gear 10. The inner wall of the connecting hole 13 is provided with a plurality of connecting grooves 14 and transition arc-shaped protrusions 15 alternately arranged in the circumferential direction. The servo motor output shaft 60 passes through the connecting hole 13 through an elastic clutch 70. The outer side of the elastic clutch 70 is provided with a meshing part that selectively meshes with the plurality of connecting grooves 14. The meshing part includes a first set of meshing parts and a second set of meshing parts, which are arranged in a cross shape.

[0077] The elastic clutch 70 includes a circular sleeve portion 71 and four connecting portions 72 located inside the sleeve portion 71. The sleeve portion 71 is coaxially connected to the servo output shaft 60. The multiple connecting portions 72 are distributed at intervals along the inner circumference of the sleeve portion 71 and are connected to the servo output shaft 60.

[0078] By alternately arranging connecting grooves 14 and transitional arc-shaped protrusions 15 on the inner wall of the connecting hole 13, and cooperating with the cross-shaped meshing portions on the outer side of the elastic clutch 70, a multi-directional force-bearing support structure is formed. This design expands the meshing point between the clutch gear and the elastic clutch 70 from the traditional two-point contact to a four-point dispersed contact, effectively solving the problem of local stress concentration caused by the traditional single-set protrusion structure, reducing friction loss and improving the smoothness of power transmission, and ensuring the continuity and reliability of torque transmission during rotational positioning.

[0079] The first set of engagement portions consists of two first arc-shaped protrusions 73 symmetrically distributed on the outer side of the elastic clutch 70, and the second set of engagement portions consists of four second arc-shaped protrusions 74. Each pair of second arc-shaped protrusions 74 is formed continuously, so that the four second arc-shaped protrusions 74 are symmetrically distributed on the outer side of the elastic clutch 70 in pairs, and a transition groove 75 that engages with the transition arc-shaped protrusion 15 is provided between the two second arc-shaped protrusions 74.

[0080] It should be further noted that the more consecutive arc-shaped protrusions are provided, the greater the requirements for the opening length and width of the deformation hole, and the greater the elastic deformation of the deformation hole, the more severe the elastic deformation attenuation, thus affecting the service life. To ensure elastic deformation, the preferred number of arc-shaped protrusions is one or two consecutively arranged, allowing for a reasonable arrangement of the deformation hole. This prevents the deformation hole from needing to be lengthened according to the consecutively arranged arc-shaped protrusions, ensuring the elastic deformation of the deformation hole, slowing down elasticity attenuation, and improving service life.

[0081] The elastic clutch 70 has a hollowed-out first set of deformation holes 76 and a second set of deformation holes 77 inside. The first set of deformation holes 76 and the second set of deformation holes 77 are respectively distributed opposite to the first set of engagement parts and the second set of engagement parts. The first set of deformation holes 76 and the second set of deformation holes 77 each include two through holes, a first waist hole and a second waist hole.

[0082] The symmetrical distribution of the first set of deformation holes 76 (corresponding to the first set of engagement parts) and the second set of deformation holes 77 (corresponding to the second set of engagement parts) allows the elastic clutch 70 to generate controllable elastic deformation under stress. The relative distribution of the two sets of deformation holes and engagement parts ensures uniform stress distribution within the sleeve 71, avoiding the elastic force attenuation problem caused by the enlarged contact surface in traditional single-set deformation grooves. This structure, while ensuring sufficient engagement contact pressure, optimizes elastic recovery performance through the design of multiple sets of deformation holes, reducing elastic force attenuation after long-term use, maintaining stable clutch contact pressure, and preventing clutch failure.

[0083] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A gear assembly, characterized in that: It includes a power output gear and multiple gear sets, which are connected by gears of different sizes through meshing transmission. The multiple gear sets include a first-stage gear set, a second-stage gear set, a third-stage gear set, and a fourth-stage gear set that are connected in sequence through transmission. The first-stage gear set includes a first driving gear and a first driven gear; The two-stage gear set includes a second driving gear and a second driven gear; The three-stage gear set includes a third driving gear and a third driven gear; The four-stage gear set includes a fourth driving gear and a fourth driven gear, with the fourth driven gear meshing with the power output gear for transmission. A support portion is formed on the first driven gear. An installation end connected to the first driving gear is formed at the end of the support portion away from the first driven gear. A first clearance groove that sinks downward along the axial direction is formed on the installation end. A mating protrusion is formed on the top of the installation end. An installation hole that is coaxially matched with the installation end is provided in the first driving gear. A mating hole communicating with the installation hole is also provided on the first driving gear. A plurality of reinforcing bosses distributed circumferentially are formed at the bottom of the installation end. A reinforcing groove that matches the reinforcing bosses is formed on the installation hole. The first driven gear is matched with the installation hole of the first driving gear through the installation end and is integrally formed by co-injection molding. A spacer groove is provided between adjacent driving gears and driven gears. A raised spacer boss is provided on the spacer groove.

2. The gear assembly according to claim 1, characterized in that: The first driving gear is made of soft plastic, and the first driven gear is made of hard plastic.

3. The gear assembly according to claim 1, characterized in that: The first-stage, second-stage, and third-stage gear sets are all configured as double gear sets.

4. The gear assembly according to claim 1, characterized in that: The first-stage gear set also includes a first optical shaft, a first driving gear and a first driven gear are coaxially connected to the first optical shaft, and the end of the first optical shaft is exposed through the first clearance groove. The end of the first driven gear away from the first driving gear is provided with a first protrusion.

5. The gear assembly according to claim 1, characterized in that: The secondary gear set also includes a second optical shaft. The second driving gear, the second driven gear, the fourth driving gear and the fourth driven gear are coaxially connected to the second optical shaft in sequence. The bottom of the second driving gear is provided with a second clearance groove for avoiding the second optical shaft. The bottom of the fourth driving gear is provided with a fourth clearance groove. The interior of the fourth clearance groove is formed with a fourth protrusion that contacts the end of the second driven gear.

6. The gear assembly according to any one of claims 1-5, characterized in that: The three-stage gear set also includes a third optical shaft, a third driving gear, a third driven gear, and a power output gear coaxially connected to the third optical shaft, and a third clearance groove for avoiding the third optical shaft is provided at the bottom of the third driving gear, and a third protrusion is formed inside the third clearance groove.

7. The gear assembly according to claim 5, characterized in that: The power output gear has a clearance groove at the end near the third driven gear, and a clearance protrusion is formed in the clearance groove to contact the end of the third driven gear.

8. A servo motor, characterized in that: The device includes a gear assembly, a servo output shaft, a drive motor, and a PCB board according to any one of claims 1-7. The output shaft of the drive motor is connected to a drive gear, which meshes with a first driving gear. A connecting hole is formed on the power output gear. The inner wall of the connecting hole is alternately provided with multiple connecting grooves and transition arc-shaped protrusions along the circumferential direction. The servo output shaft passes through the connecting hole through an elastic clutch. The outer side of the elastic clutch is provided with a meshing part that selectively meshes with the multiple connecting grooves. The meshing part includes a first set of meshing parts and a second set of meshing parts, which are arranged in a cross shape.

9. The servo motor according to claim 8, characterized in that: The first set of engagement portions consists of two first arc-shaped protrusions symmetrically distributed on the outer side of the elastic clutch, and the second set of engagement portions consists of four second arc-shaped protrusions. Each pair of second arc-shaped protrusions is continuously formed so that the four second arc-shaped protrusions are symmetrically distributed on the outer side of the elastic clutch. A transition groove is provided between the two second arc-shaped protrusions to engage with the transition arc-shaped protrusion.

10. The servo motor according to claim 8, characterized in that: The elastic clutch has a first set of deformation holes and a second set of deformation holes inside. The first set of deformation holes and the second set of deformation holes are respectively distributed opposite to the first set of engagement parts and the second set of engagement parts. The first set of deformation holes and the second set of deformation holes each include two through holes, a first waist hole and a second waist hole.

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