A simple differential gearbox

Abstract

This utility model relates to the fields of robotics and automotive technology, and discloses a simple differential gearbox, including a second internal gear ring and a sun gear. The key feature is that a second support plate is mounted on the lower surface of the second internal gear ring, a first internal gear ring is mounted on the upper surface of the second internal gear ring, a first support plate is mounted on the outer surface of the first internal gear ring, three first rivets are installed between the first support plate and the second support plate, and three second rivets are installed between the first support plate and the second support plate. This simple differential gearbox innovatively adopts a cooperative structure of two internal gear rings and three planetary gears (or multiple planetary gears): by meshing two internal gear rings with different tooth numbers with three planetary gears of the same specification, a transmission system with a self-locking function is constructed. The multi-tooth synchronous meshing design can effectively distribute the load and significantly enhance the load-bearing capacity of the gearbox.

Description

Technical Field

[0001] This utility model relates to the fields of robotics and automotive technology, specifically a simple differential gearbox. Background Technology

[0002] In the current era of rapid development in robotics technology, the gearbox, as a key component for regulating robot speed and transmitting power, directly determines the robot's load-bearing capacity, maneuverability, and operational reliability. Existing robot gearboxes have significant limitations in balancing transmission and self-locking functions: traditional planetary gear structures often rely on single gears, resulting in a limited range of transmission ratio adjustments, making it difficult to meet the demands of large transmission ratios. Achieving large transmission ratios through multi-stage gear stacking leads to problems such as structural complexity, increased size, poor operational stability, or complex installation, which contradicts the trend of robot miniaturization and fails to meet the requirements of robots or automotive interiors for compactness, load-bearing reliability, and assembly efficiency. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a simple differential gearbox. This gearbox enhances overall load-bearing capacity and operational stability, and features a simple structure, a large transmission ratio, and a self-locking function. It is easy to install and suitable for the compact and high-reliability requirements of robots or automotive interiors. It solves the problems of traditional planetary gear structures relying on single gears, having a limited transmission ratio adjustment range, and being unable to meet large transmission ratio requirements. Furthermore, achieving a large transmission ratio through multi-stage gear stacking leads to complex structures, increased size, poor operational stability, or complex installation, contradicting the trend of robot miniaturization and failing to meet the requirements of compactness, load-bearing reliability, and assembly efficiency for robots or automotive interiors.

[0004] This utility model provides the following technical solution: a simple differential gearbox, including a second internal gear ring and a sun gear. A second support plate is installed on the lower surface of the second internal gear ring, and a first internal gear ring is installed on the upper surface of the second internal gear ring. A first support plate is installed on the outer surface of the first internal gear ring. A plurality of first rivets are installed between the first support plate and the second support plate, and a plurality of second rivets are installed between the first support plate and the second support plate. Planetary gears are sleeved on the outer surface of the first rivets. The sun gear is located at the axis of the second internal gear ring and meshes with the planetary gears. The planetary gears mesh with the first internal gear ring and the second internal gear ring. The planetary gears are arranged in a ring array inside the second internal gear ring. The number of teeth on the first internal gear ring and the second internal gear ring are different.

[0005] Preferably, a washer is provided between the second internal gear ring and the first internal gear ring.

[0006] Preferably, the sun tooth includes a sun tooth tooth and a connecting post, the connecting post being fixedly installed at the axis of the sun tooth tooth tooth, and the outer surface of the connecting post being provided with a connecting groove.

[0007] Preferably, the outer surface of the first support plate is provided with a plurality of small-diameter mounting holes for the first support plate, and the outer surface of the first support plate is provided with a plurality of large-diameter mounting holes for the first support plate.

[0008] The first support plate has a sun gear mounting hole at its axis.

[0009] Preferably, the outer surface of the second support plate is provided with a plurality of small-diameter mounting holes for the second support plate, and the outer surface of the second support plate is provided with a plurality of large-diameter mounting holes for the second support plate.

[0010] The small-diameter mounting holes of the first support plate correspond to the small-diameter mounting holes of the second support plate, and the large-diameter mounting holes of the first support plate correspond to the large-diameter mounting holes of the second support plate.

[0011] Preferably, the two ends of the first rivet are respectively installed in the small-diameter mounting holes of the first support plate and the small-diameter mounting holes of the second support plate;

[0012] The two ends of the second rivet are respectively installed in the large-diameter mounting holes of the first support plate and the large-diameter mounting holes of the second support plate;

[0013] The first rivet is fixed between the first support plate and the second support plate through a hole fitting;

[0014] The second rivet is fixed between the first support plate and the second support plate through a hole.

[0015] Preferably, the first rivet includes a first rivet face, a first rivet tip, and a first rivet bottom;

[0016] The second rivet includes a second rivet face, a second rivet top, and a second rivet bottom.

[0017] Preferably, the planetary gear includes a planetary gear shaft hole and planetary gear teeth, and the planetary gear shaft hole is adapted to the first rivet surface.

[0018] Preferably, the first internal gear ring includes a first internal gear ring surface, the interior of the first internal gear ring surface is provided with first internal gear ring teeth, the outer surface of the first internal gear ring surface is provided with a first internal gear ring first hole, the outer surface of the first internal gear ring surface is provided with a second internal gear ring, the outer surface of the first internal gear ring surface is provided with a plurality of first internal gear ring holes, and the outer surface of the first internal gear ring surface is provided with a fourth internal gear ring hole.

[0019] Preferably, the second internal gear ring includes a second internal gear ring surface, the interior of the second internal gear ring surface is provided with second internal gear ring teeth, the outer surface of the second internal gear ring surface is provided with a first hole of the second internal gear ring, the outer surface of the second internal gear ring surface is provided with a second hole of the second internal gear ring, the outer surface of the second internal gear ring surface is provided with a plurality of holes of the second internal gear ring, and the outer surface of the second internal gear ring surface is provided with a fourth hole of the second internal gear ring.

[0020] The number of teeth on the first internal gear ring is greater than the number of teeth on the second internal gear ring.

[0021] Compared with the prior art, this utility model provides a simple differential gearbox with the following advantages:

[0022] This simple differential gearbox is secured to external parts by a connecting column. Power is supplied externally to the sun gear, which meshes with planetary gears for transmission. Multiple (three in this example) identical planetary gears rotate coaxially with the sun gear. The even distribution of these planetary gears distributes power evenly to the two internal gear rings, reducing the load on individual gears, improving the overall structural load-bearing capacity and operational stability, and extending service life. The first internal gear ring has fewer teeth than the second internal gear ring. When the planetary gear teeth mesh with both the first and second internal gear rings to transmit torque, the second internal gear ring rotates at a lower speed than the first, resulting in relative motion and forming a differential gear structure. The planetary gear shaft holes are mounted on the surface of the first rivet. The first and second support plates are connected by three identical first rivets and three identical second rivets, ensuring the stability and support of the gear structure. Washers are installed between the first and second internal gear rings to prevent hard friction, which could lead to reduced power or abnormal noise. After all parts are installed, the top and bottom of the first rivet, the top and bottom of the second rivet, and the second rivet are riveted to prevent the gearbox from loosening or the entire mechanism from falling apart during operation, which would lead to functional failure.

[0023] This simple differential gearbox innovatively employs a synergistic structure of two internal gear rings and three planetary gears (or multiple planetary gears): by meshing two internal gear rings with different tooth counts and three planetary gears of the same specification (or multiple planetary gears), a transmission system with self-locking function is constructed. The multi-tooth synchronous meshing design effectively distributes the load and significantly enhances the gearbox's load-bearing capacity. The second internal gear ring has fewer teeth than the first internal gear ring and rotates at a lower speed, forming a gear differential structure. Compared to the integrated planetary gear structure, the differential gearbox of this invention uses planetary gears and internal gear rings with different tooth counts, resulting in a simpler structure, tighter gear engagement, and smooth meshing rotation without any sticking. The compact planetary transmission layout significantly reduces the overall size, perfectly adapting to the limited installation space of robots, automotive interiors, and other equipment. At the same time, the direct transmission between the planetary gears and the sun gear reduces transmission backlash, and combined with the synergistic effect of multi-gear synchronous meshing, it greatly improves transmission stability and efficiency, fully meeting the core requirements of robots and automotive interiors for compact structure, strong load-bearing capacity, stable operation, and large transmission ratio. In addition, the modular design of the gearbox simplifies the assembly process and significantly improves production assembly efficiency. Attached Figure Description

[0024] Figure 1 This is a perspective view of the assembly according to this application.

[0025] Figure 2 It is an exploded perspective view based on this application.

[0026] Figure 3 This is a perspective view of the sun gear according to this application.

[0027] Figure 4 This is a perspective view of the first support plate according to this application.

[0028] Figure 5 This is a perspective view of the first rivet according to this application.

[0029] Figure 6 This is a perspective view of the second rivet according to this application.

[0030] Figure 7 This is a perspective view of a planetary gear according to this application.

[0031] Figure 8 This is a perspective view of the first internal gear ring according to this application.

[0032] Figure 9 This is a perspective view of the gasket based on this application.

[0033] Figure 10 This is a perspective view of the second internal gear ring according to this application.

[0034] Figure 11This is a perspective view of the second support plate according to this application.

[0035] In the diagram: 10, Sun gear; 10-1, Connecting post; 10-2, Sun gear teeth;

[0036] 20. First support plate; 20-1. Large-diameter mounting hole of the first support plate; 20-2. Large-diameter mounting hole of the first support plate; 20-3. Sun gear mounting hole;

[0037] 30. First rivet; 30-1. Top of first rivet; 30-2. Face of first rivet; 30-3. Bottom of first rivet;

[0038] 40. Second rivet; 40-1. Top of the second rivet; 40-2. Face of the second rivet; 40-3. Bottom of the second rivet;

[0039] 50. Planetary gear; 50-1. Planetary gear teeth; 50-2. Planetary gear shaft bore;

[0040] 60. First internal gear ring; 60-1. First hole of the first internal gear ring; 60-2. Teeth of the first internal gear ring; 60-3. Second hole of the first internal gear ring; 60-4. Third hole of the first internal gear ring; 60-5. Surface of the first internal gear ring; 60-6. Fourth hole of the first internal gear ring;

[0041] 7. Washers;

[0042] 8. Second gear ring; 80-1. First hole of the second internal gear ring; 80-2. Teeth of the second internal gear ring; 80-3. Second hole of the second internal gear ring; 80-4. Third hole of the second internal gear ring; 80-5. Surface of the second internal gear ring; 80-6. Fourth hole of the second internal gear ring;

[0043] 9. Second support plate; 90-1. Large-diameter mounting hole of the second support plate; 90-2. Small-diameter mounting hole of the second support plate. Detailed Implementation

[0044] Please see Figure 1-11A simple differential gearbox includes a second internal gear ring 80 and a sun gear 10. A second support plate 90 is mounted on the lower surface of the second internal gear ring 80, and a first internal gear ring 60 is mounted on the upper surface of the second internal gear ring 80. A first support plate 20 is mounted on the outer surface of the first internal gear ring 60. A plurality of first rivets 30 are installed between the first support plate 20 and the second support plate 90, and a plurality of second rivets 40 are installed between the first support plate 20 and the second support plate 90. Planetary gears 50 are sleeved on the outer surface of the first rivets 30. The sun gear 10 is located at the axis of the second internal gear ring 80 and meshes with the planetary gears 50. The planetary gears 50 mesh with the first internal gear ring 60 and the second internal gear ring 80. The planetary gears 50 are arranged in a ring array inside the second internal gear ring 80. The number of teeth of the first internal gear ring 60 and the second internal gear ring 80 are different.

[0045] A simple differential gearbox, comprising a support system and a gear system;

[0046] The support system consists of a first support plate 20, a second support plate 90, and a first rivet 30 and a second rivet 40 connecting the support plates. Multiple first rivets 30 and two rivets 40 are provided (three are shown in the illustration of this application), which are fixed between the first support plate 20 and the second support plate 290 through hole fitting, and are riveted after assembly to prevent loosening.

[0047] The gear system includes a sun gear 10, multiple planetary gears 50 (three in this example), a first internal gear ring 60, a second internal gear ring 80, and a washer 70. The sun gear 10 serves as the input power gear and is tightly fitted with external parts. The three planetary gears 50 are evenly distributed and mounted on the first rivet 30, with clearance fitting to prevent tight fit failure. The first internal gear ring 60 and the second internal gear ring 80 have a different number of teeth, with the first internal gear ring 60 having more teeth than the second internal gear ring 80. Both mesh with the planetary gears 50 simultaneously, forming a differential self-locking structure.

[0048] A washer 70 is provided between the second internal gear ring 80 and the first internal gear ring 60. The washer 70 is placed between the first internal gear ring 60 and the second internal gear ring 80 to isolate friction.

[0049] The sun tooth 10 includes a sun tooth 10-2 and a connecting post 10-1. The connecting post 10-1 is fixedly installed at the axis of the sun tooth 10-2, and the outer surface of the connecting post 10-1 is provided with a connecting groove.

[0050] The sun gear 10, as the input power gear of the gearbox, is tightly fitted with external parts by the connecting column 10-1 to transmit torque. The sun gear teeth 10-2 mesh with three identical planetary gears 50 simultaneously, making the transmission system run more smoothly and reliably with high transmission efficiency.

[0051] The outer surface of the first support plate 20 has three small-diameter mounting holes 20-2 and three large-diameter mounting holes 20-1.

[0052] The first support plate 20 has a sun gear mounting hole 203 at its axis.

[0053] The outer surface of the second support plate 90 has three small-diameter mounting holes 90-2 and three large-diameter mounting holes 90-1.

[0054] The small-diameter mounting hole 20-2 of the first support plate corresponds to the small-diameter mounting hole 90-2 of the second support plate, and the large-diameter mounting hole 20-1 of the first support plate corresponds to the large-diameter mounting hole 90-1 of the second support plate.

[0055] The two ends of the first rivet 30 are respectively installed in the small diameter mounting hole 20-2 of the first support plate and the small diameter mounting hole 90-2 of the second support plate;

[0056] The two ends of the second rivet 40 are respectively installed in the large-diameter mounting hole 20-1 of the first support plate and the large-diameter mounting hole 90-1 of the second support plate;

[0057] The first rivet 30 is fixed between the first support plate 20 and the second support plate 90 through a hole fit;

[0058] The two ends of three identical first rivets 30 are respectively installed in the small diameter mounting holes 20-2 and 90-2 of the first support plate. The top end 30-1 and the bottom end 30-3 of the first rivets are riveted to prevent the planetary gear from falling off during operation and causing functional failure.

[0059] The second rivet 40 is fixed between the first support plate 20 and the second support plate 90 through a hole.

[0060] The second rivet 40, the support system uses three identical rivets 240, the two ends of the three identical second rivets 4 are respectively installed in the large diameter mounting holes 20-1 and 90-1 of the first support plate. After all parts are installed, the top end 40-1 of the second rivet and the bottom end 40-3 of the second rivet are riveted to prevent the gearbox from loosening and falling apart during operation, which would cause the basic functions to fail.

[0061] The first rivet 30 includes a first rivet face 30-2, a first rivet top end 30-1, and a first rivet bottom end 30-3;

[0062] The second rivet 40 includes a second rivet face 40-2, a second rivet top 40-1, and a second rivet bottom 40-3.

[0063] The planetary gear 50 includes a planetary gear shaft hole 50-2 and planetary gear teeth 50-1, and the planetary gear shaft hole 50-2 is adapted to the first rivet surface 30-2.

[0064] The transmission of this invention employs multiple (three in this example) identical planetary gears 50, and can also utilize multiple planetary gears working together for transmission. The planetary gear teeth 50-1 are designed with a uniform structure, simplifying machining. Multiple identical planetary gear teeth 50-1 mesh simultaneously with the sun gear 10-2, the first internal gear ring 60, and the second internal gear ring 80, distributing the load to more contact points, reducing the load on individual gears, improving the overall load-bearing capacity and durability, and reducing transmission fluctuations caused by wear or errors in individual gears, resulting in smoother operation. The planetary gear shaft hole 50-2 is installed in the first rivet surface 30-2, with a clearance fit to prevent the gear from being tightly fitted to the rivet, thus preventing transmission.

[0065] The first internal gear ring 60 includes a first internal gear ring surface 60-5, the interior of the first internal gear ring surface 60-5 is provided with first internal gear ring teeth 60-2, the outer surface of the first internal gear ring surface 60-5 is provided with a first internal gear ring first hole 60-1, the outer surface of the first internal gear ring surface 60-5 is provided with a first internal gear ring second hole 60-3, the outer surface of the first internal gear ring surface 60-5 is provided with a first internal gear ring third hole 60-4, and the outer surface of the first internal gear ring surface 60-5 is provided with a first internal gear ring fourth hole 60-6.

[0066] The second internal gear ring 80 includes a second internal gear ring surface 80-5, the interior of the second internal gear ring surface 80-5 is provided with second internal gear ring teeth 80-2, the outer surface of the second internal gear ring surface 80-5 is provided with a first hole 80-1 of the second internal gear ring, the outer surface of the second internal gear ring surface 80-5 is provided with a second hole 80-3 of the second internal gear ring, the outer surface of the second internal gear ring surface 80-5 is provided with a third hole 80-4 of the second internal gear ring, and the outer surface of the second internal gear ring surface 80-5 is provided with a fourth hole 80-6 of the second internal gear ring;

[0067] The number of teeth on the first internal gear ring (60-2) is greater than the number of teeth on the second internal gear ring (80-2).

[0068] The first internal gear ring 60 has teeth 60-2 that mesh with the planetary gear teeth 50-1, providing stable torque output and reducing energy loss during gear transmission. The first internal gear ring 60 has more teeth than the second internal gear ring 80, and its rotational speed is higher. When both mesh with the three planetary gears 50 simultaneously, relative movement occurs, resulting in smooth, unhindered gear meshing. The first internal gear ring surface 60-5 mates with a washer 70. The first hole 60-1, second hole 60-3, third hole 60-4, and fourth hole 60-6 of the first internal gear ring are threaded holes for fastening with external parts.

[0069] The second internal gear ring 80 has teeth 60-2 that mesh with the planetary gear teeth 50-1 for transmission. The second internal gear ring 60 has fewer teeth than the first internal gear ring 60 and rotates at a lower speed. When both mesh with the three planetary gears 50 simultaneously, relative movement occurs, forming a gear differential structure. This provides stable torque output, a large transmission ratio, and a long service life. Furthermore, the meshing and rotation between the gears are smooth and without any resistance. The first hole 80-1, the second hole 80-3, the third hole 80-4, and the fourth hole 80-6 of the second internal gear ring are threaded holes for fastening with external parts.

[0070] The gearbox operates as follows: Connecting column 10-1 is fastened to external parts. External power is supplied to the sun gear 10, which meshes with planetary gears 50-1. Multiple (three in this example) identical planetary gears 50 rotate coaxially with the sun gear 10. The even distribution of these planetary gears 50 distributes power evenly to the two internal gear rings, reducing the load on individual gears, improving the overall structural load-bearing capacity and operational stability, and extending service life. The first internal gear ring 60 has fewer teeth than the second internal gear ring 280. When planetary gear teeth 50-1 mesh with the first internal gear ring teeth 60-2 and the second internal gear ring teeth 80-2 to transmit torque, the rotational speed of the second internal gear ring 80 is lower than that of the first internal gear ring 60, resulting in relative motion and forming a gear differential structure. The planetary gear shaft hole 50-2 is mounted on the first rivet surface 30-2. The first support plate 20 and the second support plate 90 are connected by three identical first rivets 30 and three identical second rivets 40 to ensure the stability and support of the gear structure. A washer 70 is installed between the first internal gear ring 60 and the second internal gear ring 80 to prevent hard friction between them, which could lead to reduced power or abnormal noise. After all parts are installed, the top end 30-1 and bottom end 30-3 of the first rivet, and the top end 40-1 and bottom end 40-3 of the second rivet are riveted to prevent the gearbox from loosening or the entire mechanism from falling apart during operation, which could lead to functional failure.

Claims

1. A simple differential gearbox comprising a second inner ring (80) and a sun gear (10), characterized in that: A second support plate (90) is mounted on the lower surface of the second internal gear ring (80), a first internal gear ring (60) is mounted on the upper surface of the second internal gear ring (80), a first support plate (20) is mounted on the outer surface of the first internal gear ring (60), a plurality of first rivets (30) are installed between the first support plate (20) and the second support plate (90), and a plurality of second rivets (40) are installed between the first support plate (20) and the second support plate (90). The outer surface is fitted with a planetary gear (50), the sun gear (10) is located at the axis of the second internal gear ring (80), the sun gear (10) meshes with the planetary gear (50), the planetary gear (50) meshes with the first internal gear ring (60), the planetary gear (50) meshes with the second internal gear ring (80), the planetary gear (50) is arranged in a ring array inside the second internal gear ring (80), and the first internal gear ring (60) and the second internal gear ring (80) have different numbers of teeth.

2. A simple differential gearbox as claimed in claim 1, wherein: A washer (70) is provided between the second internal gear ring (80) and the first internal gear ring (60).

3. A simple differential gearbox as claimed in claim 2, wherein: The sun tooth (10) includes a sun tooth tooth (10-2) and a connecting post (10-1). The connecting post (10-1) is fixedly installed at the axis of the sun tooth tooth (10-2), and the outer surface of the connecting post (10-1) is provided with a connecting groove.

4. A simple differential gearbox as claimed in claim 3, wherein: The outer surface of the first support plate (20) is provided with a plurality of small-diameter mounting holes (20-2) and a plurality of large-diameter mounting holes (20-1). The first support plate (20) has a sun gear mounting hole (203) at its axis.

5. A simple differential gearbox as claimed in claim 4, characterized in that: The outer surface of the second support plate (90) is provided with a plurality of small-diameter mounting holes (90-2) for the second support plate, and the outer surface of the second support plate (90) is provided with a plurality of large-diameter mounting holes (90-1) for the second support plate. The small-diameter mounting hole (20-2) of the first support plate corresponds to the small-diameter mounting hole (90-2) of the second support plate, and the large-diameter mounting hole (20-1) of the first support plate corresponds to the large-diameter mounting hole (90-1) of the second support plate.

6. A simple differential gearbox as claimed in claim 5, wherein: The two ends of the first rivet (30) are respectively installed in the small diameter mounting hole (20-2) of the first support plate and the small diameter mounting hole (90-2) of the second support plate. The two ends of the second rivet (40) are respectively installed in the large-diameter mounting hole (20-1) of the first support plate and the large-diameter mounting hole (90-1) of the second support plate; The first rivet (30) is fixed between the first support plate (20) and the second support plate (90) through a hole fit; The second rivet (40) is fixed between the first support plate (20) and the second support plate (90) by means of a hole.

7. A simple differential gearbox as claimed in claim 6, characterized in that: The first rivet (30) includes a first rivet face (30-2), a first rivet top (30-1), and a first rivet bottom (30-3). The second rivet (40) includes a second rivet face (40-2), a second rivet top (40-1), and a second rivet bottom (40-3).

8. A simple differential gearbox as claimed in claim 7, characterized in that: The planetary gear (50) includes a planetary gear shaft hole (50-2) and planetary gear teeth (50-1), and the planetary gear shaft hole (50-2) is adapted to the first rivet surface (30-2).

9. A simple differential gearbox as claimed in claim 8, characterized in that: The first internal gear ring (60) includes a first internal gear ring surface (60-5), the interior of the first internal gear ring surface (60-5) is provided with first internal gear ring teeth (60-2), the outer surface of the first internal gear ring surface (60-5) is provided with a first internal gear ring first hole (60-1), the outer surface of the first internal gear ring surface (60-5) is provided with a first internal gear ring second hole (60-3), the outer surface of the first internal gear ring surface (60-5) is provided with a first internal gear ring third hole (60-4), and the outer surface of the first internal gear ring surface (60-5) is provided with a first internal gear ring fourth hole (60-6).

10. A simple differential gearbox as claimed in claim 9, wherein: The second internal gear ring (80) includes a second internal gear ring surface (80-5), the interior of the second internal gear ring surface (80-5) is provided with second internal gear ring teeth (80-2), the outer surface of the second internal gear ring surface (80-5) is provided with a first hole (80-1) of the second internal gear ring, the outer surface of the second internal gear ring surface (80-5) is provided with a second hole (80-3) of the second internal gear ring, the outer surface of the second internal gear ring surface (80-5) is provided with a third hole (80-4) of the second internal gear ring, and the outer surface of the second internal gear ring surface (80-5) is provided with a fourth hole (80-6) of the second internal gear ring; The number of teeth in the first internal gear ring (60-2) is greater than that in the second internal gear ring (80-2).

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