Speed change gear ring positioning mechanism of double-speed gear box and speed change gear box
By combining the shift ring and paddle with the fixed ring, along with the planetary gear system, the problems of unstable gear shifting and unsmooth gear switching in the dual-speed gearbox are solved, achieving efficient and stable gear shifting operation.
Patent Information
- Application Number
- CN202422736389.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-11
AI Technical Summary
The existing dual-speed gearbox has a complex transmission structure, poor and unstable transmission performance, and unsmooth gear shifting.
It adopts a combination structure of shift ring, shift paddle and fixed ring. The shift paddle moves up and down to make the shift ring engage or disengage with the fixed ring. Combined with the planetary gear system in the gearbox, it realizes the gear change operation.
It achieves the effects of simple structure, good speed change effect, high speed change efficiency, stable speed change, and smooth gear shifting.
Smart Images
Figure CN223498576U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of gearbox structure, specifically a dual-speed gearbox gear ring positioning mechanism and gearbox with simple structure, good speed change effect, high speed change efficiency, stable speed change, and smooth gear shifting. Background Technology
[0002] As is well known, electric drills are a standard product among power tools and also the most in-demand power tool category, accounting for over 40% of all power tool sales. They are widely used in construction, decoration, and other fields. In DC single-speed electric drills, the gearbox adopts a planetary gear mechanism.
[0003] Currently, for ease of use, dual-speed gearboxes generally have an external shifting mechanism designed for them. This mechanism changes the position of the gear ring to achieve the shifting effect. However, the shifting mechanism is usually pulled up and down, which is complex and has problems such as poor shifting effect, unstable shifting, and unsmooth gear shifting. Summary of the Invention
[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a dual-speed gearbox gear ring positioning mechanism and gearbox with simple structure, good speed change effect, high speed change efficiency, stable speed change and smooth gear shifting.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A dual-speed gearbox transmission gear ring positioning mechanism is characterized in that the positioning mechanism includes a shift gear ring, a shift paddle, and a fixing ring. The shift gear ring has shift teeth in the inner circumferential direction, an annular actuating groove on the upper outer circumference of the shift gear ring, and shift engaging teeth on the outer circumference of the shift gear ring below the annular actuating groove. The fixing ring has a shift engaging groove inside that mates with the shift engaging teeth. The end of the shift paddle extends into the annular actuating groove of the shift gear ring. By moving the shift gear ring up and down with the shift paddle, the shift engaging teeth on the shift gear ring are disengaged or engaged with the shift engaging groove on the fixing ring, thereby realizing the shifting action.
[0007] A transmission gearbox includes a gearbox housing. Inside the gearbox housing, from top to bottom, are arranged a primary planetary gear, a primary planetary carrier, a secondary planetary gear, a secondary planetary carrier, a tertiary planetary gear, and a tertiary planetary carrier. The key feature is that a shift ring gear and a retaining ring are provided between the primary and secondary planetary carriers. A first positioning ring gear is connected to the upper end of the gearbox housing. Primary planetary gears are connected above the primary planetary carrier and mesh with the first positioning ring gear. A primary external ring gear is provided on the circumference of the primary planetary carrier. A primary shaft is connected to the lower middle part of the primary planetary carrier. Primary unit gears are connected to the outer circumference of the primary shaft. A ring gear is provided on the upper circumference of the secondary planetary carrier. The direction is connected to the secondary planetary gear, which meshes with the primary unit teeth on the outer side of the primary shaft. The secondary shaft is connected to the lower middle part of the secondary planetary carrier, and the secondary unit teeth are connected to the outer circumference of the secondary shaft. The secondary unit teeth mesh with the tertiary planetary gear connected to the upper circumference of the tertiary planetary carrier. The middle part of the tertiary planetary carrier is connected to the output shaft. The fixed ring is fixed on the gearbox at the position of the secondary planetary carrier. A shift gear ring is fitted on the outer side of the secondary planetary gear above the fixed ring. One end of the shift paddle on the outer side of the shift gear ring extends into the annular shift ring groove of the shift gear ring, and the other end of the shift paddle extends out of the gearbox through the shift hole provided on the gearbox.
[0008] The shift paddle of this invention moves the shift gear ring upwards, causing the shift teeth of the shift gear ring to mesh with the first-stage external gear ring of the first-stage planetary gear. When the shift paddle moves the shift gear ring downwards, the shift teeth of the shift gear ring disengage from the first-stage external gear ring of the first-stage planetary gear, thereby realizing the shifting action.
[0009] The shift hole on the gearbox described in this utility model is designed as a vertical strip, and the length of the vertical strip shift hole is the distance that the shift gear ring moves up and down.
[0010] The gearbox of this invention has a fixed shaft on its outer wall, and the shift paddle is a shift torsion spring. One end of the shift torsion spring extends into the gearbox, and the middle part of the shift torsion spring is sleeved on the fixed shaft.
[0011] The tooth box of this utility model includes an upper tooth box and a lower tooth box. An arc-shaped fixing groove is provided on the outer periphery of the fixing ring. The upper tooth box and the lower tooth box are connected by a locking bolt. The locking bolt passes through the upper tooth box and then through the arc-shaped fixing groove of the fixing ring before locking with a nut on the lower tooth box.
[0012] The gearbox of this utility model has a torque cup at the bottom. The inside of the torque cup is connected to the torque screw. The upper part of the torque screw passes through a torque spring, a steel ball pressure plate and a steel ball in sequence and contacts the lower part of the third positioning gear ring inside the gearbox. The third positioning gear ring is sleeved on the outside of the third-stage planetary gear and meshes with the third-stage planetary gear.
[0013] This utility model, due to the above-mentioned structure, has the advantages of simple structure, good speed change effect, high speed change efficiency, stable speed change, and smooth gear shifting. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the shift gear ring of this utility model.
[0015] Figure 2 This is a schematic diagram of the fixing ring of this utility model.
[0016] Figure 3 This is a structural schematic diagram of the variable speed gearbox of this utility model.
[0017] Figure 4 yes Figure 3 A schematic diagram of the structure of the intermediate two-stage transmission.
[0018] Figure 5 yes Figure 3 A schematic diagram of the structure of a three-stage transmission.
[0019] Figure 6 yes Figure 5 A cross-sectional view from another direction. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings:
[0021] As shown in the attached figure, a dual-speed gearbox gear ring positioning mechanism is characterized in that the positioning mechanism includes a shift gear ring 1, a shift paddle 2, and a fixing ring 3. The shift gear ring 1 has shift teeth 4 in the inner circumferential direction, an annular actuating groove 5 on the upper outer circumference of the shift gear ring 1, and shift engaging teeth 6 on the outer circumference of the shift gear ring 1 below the annular actuating groove 5. The fixing ring 3 has a shift engaging groove 7 inside that cooperates with the shift engaging teeth 6. The end of the shift paddle 2 extends into the annular actuating groove 5 of the shift gear ring 1. By moving the shift gear ring 1 up and down with the shift paddle 2, the shift engaging teeth 6 on the shift gear ring 1 are disengaged or engaged with the shift engaging groove 7 on the fixing ring 3, thereby realizing the shifting action.
[0022] A gearbox using the aforementioned dual-speed gearbox gear ring positioning mechanism includes a gearbox housing. Inside the gearbox housing, from top to bottom, are arranged a first-stage planetary gear 8, a first-stage planetary carrier 9, a second-stage planetary gear 10, a second-stage planetary carrier 11, a third-stage planetary gear 12, and a third-stage planetary carrier 13. The key feature is that a shift ring 1 and a fixing ring 3 are provided between the first-stage planetary carrier 9 and the second-stage planetary carrier 11. A first-stage positioning ring 14 is connected to the upper end of the gearbox housing. First-stage planetary gears 8 are connected above the first-stage planetary carrier 9 and mesh with the first-stage positioning ring 14. A first-stage external ring 15 is provided on the circumference of the first-stage planetary carrier 9. A first-stage shaft 16 is connected to the lower middle part of the first-stage planetary carrier 9. A first-stage unit gear 17 is connected to the outer circumference of the first-stage shaft 16. The second-stage planetary carrier 9... A secondary planetary gear 10 is connected to the upper circumference of the planetary carrier 11. The secondary planetary gear 10 meshes with the primary unit gear 17 on the outer side of the primary shaft 16. A secondary shaft 18 is connected to the lower middle part of the secondary planetary carrier 11. A secondary unit gear 19 is connected to the outer circumference of the secondary shaft 18. The secondary unit gear 19 meshes with the tertiary planetary gear 12 connected to the upper circumference of the tertiary planetary carrier 13. The middle part of the tertiary planetary carrier 13 is connected to the output shaft 24. The fixing ring 3 is fixed on the gearbox at the position of the secondary planetary carrier 11. A shift gear ring 1 is fitted on the outer side of the secondary planetary gear 10 above the fixing ring 3. One end of the shift paddle 2 on the outer side of the shift gear ring 1 extends into the annular shifting groove 5 of the shift gear ring 1. The other end of the shift paddle 2 extends out of the gearbox through the shifting hole provided on the gearbox.
[0023] Furthermore, after the shift paddle 2 moves the shift ring 1 upward, the shift teeth 4 of the shift ring 1 mesh with the first-stage external gear ring 15 of the first-stage planetary gear 8. After the shift paddle 2 moves the shift ring 1 downward, the shift teeth 4 of the shift ring 1 disengage from the first-stage external gear ring 15 of the first-stage planetary gear 8, thereby realizing the shifting action.
[0024] Furthermore, the shift hole 20 on the gearbox is designed as a vertical strip, and the length of the vertical strip shift hole 20 is the distance that the shift gear ring 1 moves up and down.
[0025] Furthermore, a fixed shaft 21 is provided on the outer wall of the gearbox, and the shift paddle 2 is set as a shift torsion spring. One end of the shift torsion spring extends into the gearbox, and the middle part of the shift torsion spring is sleeved on the fixed shaft 21.
[0026] Furthermore, the tooth box includes an upper tooth box cylinder 22 and a lower tooth box cylinder 23. An arc-shaped fixing groove 25 is provided on the outer periphery of the fixing ring 3. The upper tooth box cylinder 22 and the lower tooth box cylinder 23 are connected by a locking bolt 32. The locking bolt 32 passes through the upper tooth box cylinder 22 and then passes through the arc-shaped fixing groove 25 of the fixing ring 3 before being locked to the nut on the lower tooth box cylinder 23.
[0027] Furthermore, a torque cup 26 is provided at the bottom of the gearbox. The interior of the torque cup 26 is connected to the torque screw 27. The upper part of the torque screw 27 passes through a torque spring 28, a steel ball pressure plate 29, and a steel ball 30 in sequence and contacts the lower part of the third positioning gear ring 31 inside the gearbox. An annular groove is provided at the bottom of the third positioning gear ring 31, and the steel ball 30 is placed in the annular groove. The third positioning gear ring 31 is sleeved on the outside of the third-stage planetary gear 12 and meshes with the third-stage planetary gear 12.
[0028] In use, this invention features two-stage and three-stage transmission. When the shift paddle 2 moves the shift ring gear 1 upwards, the shift teeth 4 of the shift ring gear 1 mesh with the primary external gear ring 15 of the primary planetary carrier 9. At this time, the primary planetary carrier 9, the shift ring gear 1, the secondary planetary gear 10, and the secondary planetary carrier 11 form a single unit. The primary planetary carrier 9 is driven to rotate by the primary planetary gear 8, which in turn drives the entire unit consisting of the shift ring gear 1, the secondary planetary gear 10, and the secondary planetary carrier 11 to rotate. This unit then drives the tertiary planetary gear 12 to rotate, which in turn drives the tertiary planetary carrier 13 to rotate. The tertiary planetary carrier 13 ultimately drives the output shaft 24 to rotate. When the shift paddle 2 moves the shift ring gear 1 downwards, the shift teeth 4 of the shift ring gear 1 disengage from the primary gear ring 1. The first-stage outer ring gear of the planetary carrier 9 drives the first-stage planetary carrier 9 to rotate. The first-stage planetary carrier 9 drives the second-stage planetary gear 10 to rotate. The second-stage planetary gear 10 drives the second-stage planetary carrier 11 to rotate. The second-stage planetary carrier 11 drives the third-stage planetary gear 12 to rotate. The third-stage planetary gear 12 drives the third-stage planetary carrier 13 to rotate. Finally, the third-stage planetary carrier 13 drives the output shaft 24 to rotate. Therefore, the shifting action of the second-stage and third-stage gear shifting is achieved by the shift paddle 2 driving the shift ring gear 1 to move up and down. The gearbox also has a torque cup 26 and a torque screw 27, which can adjust the output torque of the output shaft 24. Due to the above structure, this utility model has the advantages of simple structure, good shifting effect, high shifting efficiency, stable shifting, and smooth gear shifting.
Claims
1. A positioning mechanism for a dual-speed gearbox gear ring, characterized in that... The positioning mechanism includes a shift ring, a shift paddle, and a retaining ring. The shift ring has shift teeth along its inner circumference, an annular actuating groove on its outer circumference, and shift engaging teeth on its outer circumference below the annular actuating groove. The retaining ring has a shift engaging groove inside that mates with the shift engaging teeth. The end of the shift paddle extends into the annular actuating groove of the shift ring. By moving the shift ring up and down with the shift paddle, the shift engaging teeth on the shift ring can be disengaged from or engaged with the shift engaging groove on the retaining ring, thereby achieving the shifting action.
2. A gearbox manufactured according to the dual-speed gearbox gear ring positioning mechanism of claim 1, comprising a gearbox housing, wherein a first-stage planetary gear, a first-stage planetary carrier, a second-stage planetary gear, a second-stage planetary carrier, a third-stage planetary gear, and a third-stage planetary carrier are arranged sequentially from top to bottom within the gearbox housing, characterized in that... A shift ring and a fixing ring are provided between the first-stage planetary carrier and the second-stage planetary carrier. The upper end of the gearbox is connected to the first positioning ring. First-stage planetary gears are connected above the first-stage planetary carrier and mesh with the first positioning ring. A first-stage external gear ring is provided on the circumference of the first-stage planetary carrier. A first-stage shaft is connected to the lower middle part of the first-stage planetary carrier. A first-stage unit tooth is connected to the outer circumference of the first-stage shaft. A second-stage planetary gear is connected to the upper circumference of the second-stage planetary carrier and meshes with the first-stage unit tooth on the outer side of the first-stage shaft. A second-stage shaft is connected to the lower middle part of the second-stage planetary carrier. A second-stage unit tooth is connected to the outer circumference of the second-stage shaft and meshes with the third-stage planetary gear connected to the upper circumference of the third-stage planetary carrier. The middle part of the third-stage planetary carrier is connected to the output shaft. The fixing ring is fixed on the gearbox at the position of the second-stage planetary carrier. A shift ring is fitted on the outer side of the second-stage planetary gear above the fixing ring. One end of the shift paddle on the outer side of the shift ring extends into the annular shift ring groove of the shift ring, and the other end of the shift paddle extends out of the gearbox through a shift hole provided on the gearbox.
3. A variable speed gearbox according to claim 2, characterized in that... When the shift paddle moves the shift gear ring upwards, the shift teeth of the shift gear ring mesh with the first-stage external gear ring of the first-stage planetary gear. When the shift paddle moves the shift gear ring downwards, the shift teeth of the shift gear ring disengage from the first-stage external gear ring of the first-stage planetary gear, thereby realizing the shifting action.
4. A variable speed gearbox according to claim 2, characterized in that... The shift hole on the gearbox is designed as a vertical strip, and the length of the vertical strip is the distance that the shift gear ring moves up and down.
5. A variable speed gearbox according to claim 2, characterized in that... The gearbox has a fixed shaft on its outer wall, and the shift paddle is a shift torsion spring. One end of the shift torsion spring extends into the gearbox, and the middle part of the shift torsion spring is sleeved on the fixed shaft.
6. A variable speed gearbox according to claim 2, characterized in that... The tooth box includes an upper tooth box and a lower tooth box. An arc-shaped fixing groove is provided on the outer periphery of the fixing ring. The upper tooth box and the lower tooth box are connected by a locking bolt. The locking bolt passes through the upper tooth box and then through the arc-shaped fixing groove of the fixing ring before locking with a nut on the lower tooth box.
7. A variable speed gearbox according to claim 2, characterized in that... The gearbox is equipped with a torque cup at the bottom. The inside of the torque cup is connected to a torque screw. Above the torque screw, a torque spring, a steel ball pressure plate, and a steel ball are sequentially passed and contact the lower part of the third positioning gear ring inside the gearbox. The third positioning gear ring is sleeved on the outside of the third-stage planetary gear and meshes with the third-stage planetary gear.