Transmission

Abstract

The utility model discloses a transmission, and relates to the technical field of transmissions. The gear shifting mechanism comprises a first gear shifting mechanism and a second gear shifting mechanism which are connected in a matched mode, the gear shifting mechanism further comprises a switching mechanism, the switching mechanism is shifted until the switching mechanism is connected with the second gear shifting mechanism and connected with a shell in a limiting mode, and the first gear shifting mechanism is matched with the second gear shifting mechanism to achieve two-stage gear shifting. And the switching mechanism is reversely shifted to be connected with the first speed change mechanism and the second speed change mechanism at the same time, so that the second speed change mechanism is locked on the first speed change mechanism, and only one-stage speed change is realized. The multi-stage transmission has the advantages that locking and unlocking between part of two-stage transmission are directly controlled through the switching mechanism, so that gear ratio switching can be rapidly completed in the high-speed running state, a complex planetary gear separation and meshing mechanism in a traditional multi-stage transmission is avoided, the manufacturing cost of the transmission is reduced, and the service life of the transmission is prolonged. And the reliability and durability of the structure are also improved.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, and in particular to a transmission. Background Technology

[0002] In modern mechanical transmission systems, the gearbox plays a crucial role, enabling the transmission of power and adjustment of speed to adapt to different work requirements. With the advancement of technology and the development of industry, the performance requirements for gearboxes are becoming increasingly stringent. They are required not only to have high transmission efficiency and stability, but also to have flexible and versatile rapid gear shifting capabilities to meet complex and ever-changing working conditions.

[0003] Traditional transmissions mostly use fixed gear ratios and cannot be flexibly adjusted according to actual needs, which limits their application range to a certain extent. In order to overcome this defect, people began to develop transmissions with multi-stage speed change function to adapt to different load and speed requirements. However, the structure of multi-stage transmissions is often more complex, and the operation of switching gear ratios is cumbersome, which is not conducive to improving the operating efficiency and ease of operation of the equipment.

[0004] To address the aforementioned issues, some improved transmissions have emerged on the market, such as planetary gear transmissions. These transmissions achieve different gear ratios through the meshing and disengagement of multi-stage planetary gears, resulting in higher transmission efficiency and better stability. However, these transmissions still require relatively complex operations when switching gear ratios and cannot be switched at high speeds, thus having certain limitations.

[0005] Based on this, the applicant proposed a transmission to solve the above technical problems. Utility Model Content

[0006] This utility model addresses the shortcomings of the prior art by providing a transmission to solve the aforementioned technical problems.

[0007] This utility model is solved by the following technical solution:

[0008] A transmission includes a first gear shift mechanism and a second gear shift mechanism, the first gear shift mechanism and the second gear shift mechanism being connected in cooperation. It also includes a switching mechanism, which is activated such that it connects to the second gear shift mechanism and simultaneously is limited to a housing. The first gear shift mechanism and the second gear shift mechanism cooperate to achieve two-stage gear shifting. Activating the switching mechanism in the opposite direction so that it connects to both the first gear shift mechanism and the second gear shift mechanism simultaneously locks the second gear shift mechanism onto the first gear shift mechanism, thereby achieving only one-stage gear shifting.

[0009] Preferably, the switching mechanism includes a toggle ring slidably disposed on the housing, a lever fixedly disposed on the toggle ring, and a toggle tooth ring rotatably disposed on the inner side of the toggle ring.

[0010] Preferably, the actuating toothed ring includes a ring body, a sliding groove is provided at one end of the outer side of the ring body, a plurality of limiting protrusions A are provided along the circumferential direction between the outer side of the ring body and the sliding groove, and a second internal toothed ring is provided on the inner side of the ring body.

[0011] Preferably, the actuating ring is provided with a plurality of limiting pins, which pass through the actuating ring and connect to the sliding groove, thereby causing the actuating gear ring to rotate on the actuating ring.

[0012] Preferably, the outer side of the actuating ring is also provided with a plurality of protrusions that slide in cooperation with the housing.

[0013] Preferably, the first transmission mechanism includes a first planetary carrier, on one side of which a plurality of first planetary gears are rotatably disposed, and also includes a first internal gear ring fixedly connected to the housing, the first internal gear ring meshing with the first planetary gears, and also includes a first sun gear connected to the driver, the first sun gear being coaxially disposed with the first planetary carrier and meshing with the first planetary gears, and a mating gear ring being disposed on the outer side of the first planetary carrier, the mating gear ring being adapted to the second internal gear ring.

[0014] Preferably, the second transmission mechanism includes a second planetary carrier, on one side of which a plurality of second planetary gears are rotatably disposed, the second planetary gears being meshed with the second internal gear ring, and further includes a second sun gear fixedly disposed on the first planetary carrier, the second sun gear being coaxially disposed with the second planetary carrier and meshing with the second planetary gears.

[0015] Preferably, a limiting tooth B is provided on the inner side of the housing, and the limiting tooth B is adapted to the limiting tooth A.

[0016] Preferably, after the actuating ring slides towards the second gear mechanism until the limiting tooth B and the limiting tooth A engage and connect, the second internal gear ring meshes with the second planetary gear and disengages from the mating gear ring. The rotation of the first sun gear drives the rotation of the first planetary carrier, and the rotation of the second sun gear at the same speed drives the rotation of the second planetary carrier to achieve two-stage gear shifting.

[0017] Preferably, after the actuating ring slides towards the first gear mechanism until the second internal gear ring meshes with the mating gear ring, the second internal gear ring simultaneously meshes with the second planetary gear, and the limiting tooth A disengages from the limiting tooth B. At this time, the second planetary carrier, the second planetary gear, and the actuating gear ring are all locked to the first planetary carrier. The rotation of the first sun gear drives the first planetary carrier to rotate, thereby causing the second planetary carrier to rotate at the same speed to achieve first-level gear change.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. Enhanced gear shifting flexibility: The transmission of this utility model realizes flexible adjustment of the transmission ratio through the switching mechanism. Users can quickly and easily change the lock-up and unlock state between two stages of transmission according to actual needs, thereby adjusting the transmission ratio of the transmission to adapt to complex and changing working conditions. This design not only improves the operating efficiency of the equipment, but also significantly enhances the convenience of operation.

[0020] 2. Simplified transmission structure: Compared with traditional multi-stage transmissions, the transmission structure of this utility model is simpler. Through the innovative switching mechanism design, the transmission ratio can be adjusted, avoiding the complex planetary gear separation and meshing mechanism in traditional multi-stage transmissions. This not only reduces the manufacturing cost of the transmission, but also improves its structural reliability and durability.

[0021] 3. Achieve rapid gear shifting: Since the transmission of this utility model directly controls the locking and unlocking between two stages of transmission through the switching mechanism, it can quickly complete the gear ratio switching under high-speed operation. This feature breaks through the limitations of traditional transmissions, which are complicated to operate and difficult to perform at high speeds when switching gear ratios, making the transmission have a wider range of application prospects in high-speed mechanical equipment.

[0022] 4. Maintaining high transmission efficiency and stability: During the gear shifting process, the transmission of this invention always maintains the meshing state of all planetary gears, avoiding the transmission efficiency loss and stability problems that may be caused by planetary gear disengagement, and also avoiding the wear that may occur during gear disengagement and meshing. At the same time, the design of the switching mechanism ensures the precise adjustment of the transmission ratio, thereby maintaining the high transmission efficiency and stability of the transmission. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of this utility model. For those skilled in the art, other embodiments and their accompanying drawings can be obtained from the embodiments shown in these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 3 This is an exploded view of the three-dimensional structure of this utility model.

[0027] Figure 4 This is a three-dimensional structural cross-sectional view of the high-speed gear of this utility model.

[0028] Figure 5 This is a three-dimensional structural cross-sectional view of the high-speed gear of this utility model.

[0029] Figure 6 This is a three-dimensional structural cross-sectional view of the low-speed gear of this utility model.

[0030] Figure 7 This is a three-dimensional structural diagram of the switching mechanism of this utility model.

[0031] Figure 8 This is a three-dimensional structural diagram of the actuating gear ring of this utility model.

[0032] Figure 9 This is a three-dimensional structural diagram of the actuating ring of this utility model.

[0033] Figure 10 This is a three-dimensional structural diagram of Embodiment 2 of this utility model.

[0034] Figure 11 This is a three-dimensional structural diagram of Embodiment 2 of this utility model.

[0035] Figure 12 This is a three-dimensional structural cross-sectional view of the high-speed gear in Embodiment 2 of this utility model.

[0036] Figure 13 This is a three-dimensional structural cross-sectional view of the high-speed gear in Embodiment 2 of this utility model.

[0037] Figure 14 This is a three-dimensional structural cross-sectional view of the low-speed gear of Embodiment 2 of this utility model.

[0038] Figure 15This is an exploded three-dimensional view of the three-stage transmission mechanism of Embodiment 2 of this utility model.

[0039] In the diagram: 1. First gear change mechanism; 11. First planetary carrier; 111. Mating gear ring; 12. First planetary gear; 13. First internal gear ring; 14. First sun gear; 2. Second gear change mechanism; 21. Second planetary carrier; 22. Second planetary gear; 23. Second internal gear ring; 24. Second sun gear; 3. Switching mechanism; 31. Actuating ring; 311. Actuating lever; 312. Protrusion; 32. Actuating gear ring; 321. Ring body; 322. Sliding groove; 323. Limiting protrusion A; 33. Limiting pin; 4. Housing; 41. Limiting protrusion B; 5. Connector; 6. Front housing; 7. Bearing; 8. Third gear change mechanism. Detailed Implementation

[0040] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Example 1:

[0041] like Figures 1 to 9 As shown, a transmission according to this utility model includes a first transmission mechanism 1 and a second transmission mechanism 2. The first transmission mechanism 1 and the second transmission mechanism 2 are connected in cooperation. The transmission also includes a switching mechanism 3. When the switching mechanism 3 is moved to connect with the second transmission mechanism 2 and simultaneously to be limited by the housing 4, the first transmission mechanism 1 and the second transmission mechanism 2 cooperate to achieve two-stage transmission. When the switching mechanism 3 is moved in the opposite direction to connect with both the first transmission mechanism 1 and the second transmission mechanism 2, the second transmission mechanism 2 is locked onto the first transmission mechanism 1, thereby achieving only one-stage transmission.

[0042] The switching mechanism 3 includes a toggle ring 31 slidably disposed on the housing 4. A lever 311 is fixedly disposed on the toggle ring 31. A toggle tooth ring 32 is rotatably disposed on the inner side of the toggle ring 31. A plurality of limiting pins 33 are disposed on the toggle ring 31. The limiting pins 33 pass through the toggle ring 31 and connect with the sliding groove 322, thereby causing the toggle tooth ring 32 to be rotatably disposed on the toggle ring 31. The toggle tooth ring 32 includes a ring body 321. A sliding groove 322 is disposed at one end of the outer side of the ring body 321. A plurality of limiting protrusions A323 are disposed circumferentially between the outer side of the ring body 321 and the sliding groove 322. A second internal tooth ring 23 is disposed on the inner side of the ring body 321. A plurality of protrusions 312 that slide with the housing 4 are also disposed on the outer side of the toggle ring 31.

[0043] The first transmission mechanism 1 includes a first planetary carrier 11, on one side of which a plurality of first planetary gears 12 are rotatably disposed. It also includes a first internal gear ring 13 fixedly connected to the housing 4, which meshes with the first planetary gears 12. It also includes a first sun gear 14 connected to the driver, which is coaxially disposed with the first planetary carrier 11 and meshes with the first planetary gears 12. A mating gear ring 111 is disposed on the outer side of the first planetary carrier 11, which is adapted to the second internal gear ring 23.

[0044] The first internal gear ring 13 is engaged inside the housing 4. When the first sun gear 14 rotates, the first planet gear 12 meshing with it rotates. The first planet gear 12 meshes with the first internal gear ring 13, so it will revolve around the sun gear, driving the first planet carrier 11 to rotate, thus achieving a single-stage speed change.

[0045] The second transmission mechanism 2 includes a second planetary carrier 21, on one side of which a plurality of second planetary gears 22 are rotatably disposed. The second planetary gears 22 are meshed with the second internal gear ring 23. It also includes a second sun gear 24 fixedly disposed on the first planetary carrier 11. The second sun gear 24 is coaxially disposed with the second planetary carrier 21 and meshes with the second planetary gears 22.

[0046] The inner side of the housing 4 is provided with a limiting tooth B41, which is adapted to the limiting tooth A323.

[0047] The actuating ring 31 slides toward the second gear mechanism 2 until the limiting tooth B41 and the limiting tooth A323 are engaged and connected. Then, the second internal gear ring 23 meshes with the second planetary gear 22 and disengages from the mating gear ring 111. The first sun gear 14 rotates, driving the first planetary carrier 11 to rotate. The second sun gear 24 rotates at the same speed, thereby driving the second planetary carrier 21 to rotate, thus achieving two-stage gear shifting.

[0048] In the above state, after the limiting tooth B41 and the limiting tooth A323 are engaged, the actuating gear ring 32 is locked on the housing 4 and cannot rotate. Therefore, when the first sun gear 14 rotates, the first planetary carrier 11 rotates through the first transmission mechanism 1, realizing the first-level transmission. The rotation of the first planetary carrier 11 causes the second sun gear 24 to rotate synchronously, and the second planetary gear 22 meshing with it rotates. The second planetary gear 22 meshes with the second internal gear ring 23 and the second internal gear ring 23 is fixed. Therefore, the second planetary gear 22 will revolve, driving the second planetary carrier 21 to rotate, realizing the second-level transmission, that is, in the low gear.

[0049] The actuating ring 31 slides towards the first gear mechanism 1 until the second internal gear ring 23 engages with the mating gear ring 111. At the same time, the second internal gear ring 23 engages with the second planetary gear 22, and the limiting tooth A323 disengages from the limiting tooth B41. At this time, the second planetary carrier 21, the second planetary gear 22, and the actuating ring 32 are all locked to the first planetary carrier 11. The rotation of the first sun gear 14 drives the first planetary carrier 11 to rotate, thereby causing the second planetary carrier 21 to rotate at the same speed to achieve first-level gear change.

[0050] In the above state, the second internal gear ring 23 is simultaneously engaged with the second planetary gear 22 and the first planetary carrier 11. The rotation of the first sun gear 14 drives the first planetary carrier 11 to rotate, and the first planetary carrier 11 drives the second internal gear ring 23, which is engaged with it, to rotate at the same speed. At the same time, the second sun gear 24 rotates synchronously with the first planetary carrier 11 at the same speed. During this process, since the second planetary gear 22 is engaged with both the second internal gear ring 23 and the second sun gear 24, the second planetary gear 22 is locked and does not rotate on its own axis. As the second sun gear 24 and the second internal gear ring 23 rotate, they revolve around the sun gear, driving the second planetary carrier 21 to rotate at the same speed as the first planetary carrier 11. Therefore, only one level of gear change is achieved, that is, it is in the high-speed gear. Example 2:

[0051] The gearbox structure of Example 1 can be applied to power tools, such as electric drills. This example provides a gearbox structure that can be used in electric drills, such as... Figures 10 to 15As shown, based on the transmission structure of Embodiment 1, a third transmission mechanism 8 is provided. The third transmission mechanism 8 is also a planetary reducer, which is connected to the second transmission mechanism 2. Two-stage or three-stage transmission can be achieved through the switching mechanism 3. A connector 5 is fixedly provided at the shaft center of the third planetary carrier of the third transmission mechanism 8. The other end of the connector 5 is used to connect various bit types. In order to reduce friction during operation, a bearing can be provided between the connector 5 and the front housing 6.

[0052] Similarly, those skilled in the art can apply the transmission structure in Embodiment 1 according to actual needs to realize the function of multi-level speed change, and can use the switching mechanism 3 to realize the switching between high speed and low speed.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and not restrictive in all respects. The scope of this invention is defined by the appended claims, not by the foregoing description, and is therefore intended to encompass all variations falling within the meaning and scope of equivalents of the claims. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A transmission, comprising a first transmission mechanism (1) and a second transmission mechanism (2), wherein the first transmission mechanism (1) and the second transmission mechanism (2) are connected in cooperation, characterized in that: It also includes a switching mechanism (3), which is turned so that the switching mechanism (3) is connected to the second gear change mechanism (2) and simultaneously limited to the housing (4). The first gear change mechanism (1) and the second gear change mechanism (2) cooperate to achieve two-stage gear change. The switching mechanism (3) is turned in the opposite direction so that the switching mechanism (3) is connected to both the first gear change mechanism (1) and the second gear change mechanism (2), so that the second gear change mechanism (2) is locked on the first gear change mechanism (1), thereby achieving only one-stage gear change.

2. The transmission according to claim 1, characterized in that: The switching mechanism (3) includes a toggle ring (31) slidably disposed on the housing (4), a lever (311) fixedly disposed on the toggle ring (31), and a toggle tooth ring (32) rotatably disposed on the inner side of the toggle ring (31).

3. A transmission according to claim 2, characterized in that: The actuating gear ring (32) includes a ring body (321), a sliding groove (322) is provided at one end of the outer side of the ring body (321), a plurality of limiting protrusions A (323) are provided between the outer side of the ring body (321) and the sliding groove (322) along the circumferential direction, and a second internal gear ring (23) is provided on the inner side of the ring body (321).

4. A transmission according to claim 3, characterized in that: The actuating ring (31) is provided with a plurality of limiting pins (33). The limiting pins (33) pass through the actuating ring (31) and are connected to the sliding groove (322), thereby causing the actuating tooth ring (32) to rotate on the actuating ring (31).

5. A transmission according to claim 2, characterized in that: The outer side of the actuating ring (31) is also provided with several protrusions (312) that slide in cooperation with the housing (4).

6. A transmission according to claim 3, characterized in that: The first transmission mechanism (1) includes a first planetary carrier (11), on one side of which a plurality of first planetary gears (12) are rotatably disposed, and also includes a first internal gear ring (13) fixedly connected to the housing (4), the first internal gear ring (13) meshing with the first planetary gears (12), and also includes a first sun gear (14) connected to the driver, the first sun gear (14) being coaxially disposed with the first planetary carrier (11) and meshing with the first planetary gears (12), and a mating gear ring (111) being disposed on the outer side of the first planetary carrier (11), the mating gear ring (111) being adapted to the second internal gear ring (23).

7. A transmission according to claim 6, characterized in that: The second transmission mechanism (2) includes a second planetary carrier (21), on one side of which a plurality of second planetary gears (22) are rotatably disposed. The second planetary gears (22) are meshed with the second internal gear ring (23). It also includes a second sun gear (24) fixedly disposed on the first planetary carrier (11). The second sun gear (24) is coaxially disposed with the second planetary carrier (21) and meshes with the second planetary gears (22).

8. A transmission according to claim 7, characterized in that: The inner side of the housing (4) is provided with a limiting tooth B (41), which is adapted to the limiting tooth A (323).

9. A transmission according to claim 8, characterized in that: The actuating ring (31) slides toward the second gear mechanism (2) until the limiting tooth B (41) and the limiting tooth A (323) are engaged and connected. Then the second internal gear ring (23) meshes with the second planetary gear (22) and disengages from the mating gear ring (111). The first sun gear (14) rotates, driving the first planetary carrier (11) to rotate. The second sun gear (24) rotates at the same speed, thereby driving the second planetary carrier (21) to rotate to achieve two-stage gear change.

10. A transmission according to claim 8, characterized in that: The actuating ring (31) slides toward the first gear mechanism (1) until the second internal gear ring (23) meshes with the mating gear ring (111). At the same time, the second internal gear ring (23) meshes with the second planetary gear (22), and the limiting convex tooth A (323) disengages from the limiting convex tooth B (41). At this time, the second planetary carrier (21), the second planetary gear (22) and the actuating ring (32) are all locked with the first planetary carrier (11). The rotation of the first sun gear (14) drives the first planetary carrier (11) to rotate, thereby making the second planetary carrier (21) rotate at the same speed to achieve first-level gear change.

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