A planetary gearbox, continuously variable transmission and human-powered vehicle

Abstract

The application discloses a planetary gear box, a continuously variable transmission and a human-powered vehicle, and relates to the technical field of continuously variable transmissions.The planetary gear box comprises a main box body, which is installed outside the continuously variable transmission; a planetary support, which is rotatably installed in the main box body; a pull wire assembly, one end of which penetrates into the main box body and is connected to the planetary support, and which is used for pulling the planetary support to rotate in the forward and reverse directions; and a driving wheel set, which is rotatably installed in the main box body and is connected to the planetary support; wherein the driving wheel set is partially exposed outside the main box body, the continuously variable transmission is provided with a through opening, and the exposed part of the driving wheel set is connected to the inside of the continuously variable transmission through the through opening, so as to drive the inside of the continuously variable transmission to perform a speed change movement.The pull wire assembly is fixedly connected to the planetary support to form a two-in-one pull wire structure, the pull wire assembly can drive the planetary support to rotate by being pulled, the driving wheel set is driven to rotate, and the continuously variable transmission is driven to perform a speed change movement, so that the application has the advantages of a clever and simple structure.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and particularly to a planetary gearbox, a continuously variable transmission (CVT), and a human-powered vehicle. Background Technology

[0002] Currently, continuously variable transmissions (CVTs) are an essential component of human-powered vehicles, enabling them to change gears continuously. Human-powered vehicles also have another device used in conjunction with the CVT: a gear drive assembly. This assembly connects to the CVT, allowing the user to operate it to control the CVT and achieve continuously variable gear shifting.

[0003] In traditional continuously variable transmissions (CVTs), the transmission drive component is built into the CVT or installed as an integral part of it. This means that the main structure of the CVT needs to be modified before the transmission drive component can be installed. This installation method is complicated and cumbersome, and it is also inconvenient to disassemble and repair the transmission drive component from inside the transmission body.

[0004] To address the aforementioned installation complexity issue, existing technologies involve externally mounting the transmission drive assembly outside the continuously variable transmission (CVT), allowing for easy disassembly, maintenance, and replacement. However, the internal drive structure of existing externally mounted transmission drive assemblies is quite complex. Summary of the Invention

[0005] The purpose of this invention is to provide a planetary gearbox, a continuously variable transmission (CVT), and a human-powered vehicle, aiming to solve the problem of complex drive structures in existing transmission drive components installed outside the CVT.

[0006] To solve the above-mentioned technical problems, the objective of this invention is achieved through the following technical solution: providing a planetary gearbox for use in a continuously variable transmission (CVT), the planetary gearbox comprising:

[0007] The main housing is installed on the outside of the continuously variable transmission;

[0008] The planetary support is rotatably mounted inside the main housing.

[0009] A pull wire assembly, one end of which passes through the main housing and is connected to the planetary support, is used to pull the planetary support to rotate in both directions;

[0010] The drive wheel assembly is rotatably mounted inside the main housing and connected to the planetary support.

[0011] The drive wheel assembly is partially exposed outside the main housing. The continuously variable transmission (CVT) has a port, through which the exposed portion of the drive wheel assembly connects to the interior of the CVT to drive the CVT for gear shifting.

[0012] Furthermore, the main housing is provided with an installation port and a circular toothed groove arranged radially along the installation port; the planetary carrier includes a planet carrier and at least one planetary gear, the planet carrier is installed in the installation port, the planetary gear is rotatably installed on the planet carrier and meshed with the circular toothed groove, and the drive wheel assembly is meshed with the planetary gear.

[0013] Furthermore, the planetary gears are provided in three and are circumferentially distributed on the planet carrier, and the drive wheel assembly is meshed between the three planetary gears.

[0014] Furthermore, the pull wire assembly includes a first pull wire and a second pull wire, with one end of the first pull wire and the second pull wire respectively connected and wound around the planetary carrier in a clockwise and counterclockwise direction.

[0015] Furthermore, the planetary carrier has multiple annular grooves on its outer circumference, and two fixing holes are provided inside the planetary carrier. The annular grooves are connected to the fixing holes, and one end of the first pull wire and the second pull wire are wound around the corresponding annular grooves and fixed in the corresponding fixing holes.

[0016] Furthermore, the drive wheel assembly includes a sun gear and a bridge gear. The sun gear is coaxially mounted with the planet carrier via a set rotating shaft. The sun gear includes an integrally set small sun gear and a large sun gear. The small sun gear is meshed between the three planet gears, and the large sun gear is meshed with the bridge gear. The bridge gear is partially exposed outside the main housing.

[0017] Furthermore, the main housing is provided with a sleeve, and the main housing is fitted onto one end of the continuously variable transmission through the sleeve, with the bridge wheel portion exposed to the sleeve and connected to the interior of the continuously variable transmission.

[0018] Furthermore, the front of the main housing is provided with a front cover, the rear of the main housing is provided with a rear cover, and the two ends of the rotating shaft are rotatably mounted on the front cover and the rear cover.

[0019] This invention also provides a continuously variable transmission (CVT), comprising: a transmission body, a transmission mechanism and a gear shifting mechanism, and further comprising a planetary gearbox as described above;

[0020] The planetary gearbox is located outside the transmission body, and the transmission mechanism is located inside the transmission body with one end protruding from the opening of the transmission body. The drive wheel set of the planetary gearbox is connected and meshed with the end of the transmission mechanism that protrudes from the transmission body and is used to drive the transmission mechanism to rotate. The gear shifting mechanism is located inside the transmission body, and the transmission mechanism is connected to the gear shifting mechanism and is used to link the gear shifting mechanism to swing to achieve gear shifting.

[0021] This invention also provides a human-powered vehicle, including the continuously variable transmission (CVT) as described above.

[0022] This invention provides a planetary gearbox, a continuously variable transmission (CVT), and a human-powered vehicle. The planetary gearbox includes: a main housing, mounted outside the CVT; a planetary carrier, rotatably mounted inside the main housing; a cable assembly, one end of which passes through the main housing and connects to the planetary carrier, for pulling the planetary carrier to rotate forward and backward; and a drive wheel assembly, rotatably mounted inside the main housing and connected to the planetary carrier. The drive wheel assembly extends beyond the main housing. The CVT has a port through which the exposed portion of the drive wheel assembly connects to the interior of the CVT, thereby coordinating with the CVT's internal components for gear shifting. This invention fixes the cable assembly and planetary carrier together, forming a two-in-one cable-operated structure. Pulling the cable assembly rotates the planetary carrier, which in turn drives the drive wheel assembly, thereby coordinating with the CVT for gear shifting. This design is ingenious and simple. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of a continuously variable transmission (CVT) provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the assembly structure of a planetary gearbox provided in an embodiment of the present invention;

[0026] Figure 3 A cross-sectional structural schematic diagram of a continuously variable transmission (CVT) provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the overall structure of the planetary gearbox provided in an embodiment of the present invention;

[0028] Figure 5This is an exploded structural diagram of a planetary gearbox provided in an embodiment of the present invention;

[0029] Figure 6 This is another exploded structural diagram of a planetary gearbox provided in an embodiment of the present invention;

[0030] Figure 7 This is another exploded structural diagram of a planetary gearbox provided in an embodiment of the present invention.

[0031] Explanation of the markings in the image:

[0032] 1. Planetary gearbox; 11. Main housing; 111. Mounting port; 112. Circular tooth groove; 113. Sleeve opening; 114. Cable sleeve; 115. Shaft; 12. Planetary carrier; 121. Planetary support; 1211. Annular groove; 1212. Fixing hole; 122. Planetary gears; 13. Drive wheel set; 131. Sun gear; 132. Transition wheel; 14. Front cover; 15. Rear cover;

[0033] 2. Continuously variable transmission; 21. Transmission body; 22. Transmission mechanism; 221. Screw; 222. Sliding component; 23. Speed ​​change mechanism; 24. Port; 25. End cover; 26. Main shaft. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] Combination Figure 2 , Figure 4 , Figure 5 and 6 This invention provides a planetary gearbox for use in a continuously variable transmission 2. The planetary gearbox 1 includes: a main housing 11, a planetary carrier 12, a cable assembly, and a drive wheel set 13.

[0039] The main housing 11 is mounted on the outside of the continuously variable transmission 2; the planetary carrier 12 is rotatably mounted inside the main housing 11; one end of the pull cable assembly passes through the main housing 11 and is connected to the planetary carrier 12, for pulling the planetary carrier 12 to rotate forward and backward; the drive wheel set 13 is rotatably mounted inside the main housing 11 and connected to the planetary carrier 12.

[0040] The drive wheel assembly 13 is partially exposed outside the main housing 11. The continuously variable transmission 2 is provided with a port 24. The exposed part of the drive wheel assembly 13 is connected to the inside of the continuously variable transmission 2 through the port 24 to drive the internal parts of the continuously variable transmission 2 to perform speed change.

[0041] The working principle of this embodiment is as follows: the other end of the cable assembly is connected to the shift lever. By operating the shift lever, the cable assembly can be pulled, so that the cable assembly can pull the planetary carrier 12 to perform forward and reverse rotation, so that the planetary carrier 12 can drive the drive wheel set 13 to perform forward and reverse rotation, so that the drive wheel set 13 can drive the internal transmission structure of the continuously variable transmission 2 to achieve transmission speed change.

[0042] In order to achieve external installation of the planetary gearbox 1 in this embodiment, a port 24 is provided at one end of the continuously variable transmission 2. After the planetary gearbox 1 is installed at one end of the continuously variable transmission 2, the part of the drive wheel set 13 exposed from the planetary gearbox 1 can be connected to the internal structure of the continuously variable transmission 2 through the port 24, thereby driving the internal part of the continuously variable transmission 2 to perform speed change.

[0043] In this embodiment, the pull cable assembly is fixedly connected to the planetary support 12 to form a two-in-one pull cable structure. By pulling the pull cable assembly, the planetary support 12 can be rotated, which in turn drives the drive wheel set 13 to rotate, thereby driving the continuously variable transmission 2 to perform speed change. The entire planetary gearbox 1 adopts a purely mechanical structure and has a clever and simple structure, with the advantages of low cost and high stability.

[0044] The specific structure of planetary gearbox 1 is described in detail below:

[0045] In one embodiment, the main housing 11 is provided with a mounting port 111 and a circular toothed groove 112 arranged radially along the mounting port 111; the planetary carrier 12 includes a planet carrier 121 and at least one planetary gear 122, the planet carrier 121 is installed in the mounting port 111, the planetary gear 122 is rotatably installed on the planet carrier 121 and meshed in the circular toothed groove 112, and the drive wheel set 13 is meshed with the planetary gear 122.

[0046] In this embodiment, the planet carrier 121 is a cylindrical structure, and the mounting port 111 is a circular opening. The planet carrier 121 is rotatably mounted in the mounting port 111 with its axis of rotation 115 as the center. The circular tooth groove 112 is concentric with the origin of the mounting port 111 and is located on the radial outer side of the mounting port 111, that is, the circular tooth groove 112 is located on the radial outer side of the planet carrier 121. A rotating shaft is provided on the end face of the planet carrier 121, and the planet gear 122 is rotatably mounted on the rotating shaft. The planet gear 122 is meshed with the circular tooth groove 112. The circular tooth groove 112 can ensure the stability of the planet gear 122, thereby ensuring that the planet gear 122 can stably drive the gear set 13 to move.

[0047] Preferably, three planetary gears 122 are provided and circumferentially distributed on the planet carrier 121, and the drive wheel set 13 is simultaneously meshed and connected between the three planetary gears 122; thus, when the cable assembly drives the planet carrier 121 to rotate, the planet carrier 121 drives the three planetary gears 122 to rotate circumferentially on the circular tooth groove 112, so that the three planetary gears 122 can drive the drive wheel set 13 to rotate, so that the exposed part of the drive wheel set 13 can drive the internal part of the continuously variable transmission to perform speed change.

[0048] Combination Figure 5 and Figure 6 In one embodiment, the cable assembly (not shown in the figure) includes a first cable and a second cable. Two cable sleeves 114 connecting the inside and outside can be provided on the main housing 11. One end of the first cable and the second cable are respectively inserted into the two cable sleeves 114 and connected to each other by circling clockwise and counterclockwise around the planetary carrier 121. Thus, by pulling the first cable or the second cable, the planetary carrier 121 can be driven to rotate clockwise or counterclockwise to realize the forward and reverse rotation of the planetary carrier 121, that is, to realize the forward and reverse rotation of the entire planetary carrier 12, thereby driving the forward and reverse rotation of the drive wheel set 13, and then driving the continuously variable transmission to perform gear shifting.

[0049] Combination Figure 6 As shown, in one embodiment, the planetary carrier 121 has multiple annular grooves 1211 on its outer circumference and two fixing holes 1212 inside the planetary carrier 121. The annular grooves 1211 and the fixing holes 1212 are connected. One end of the first pull wire and the second pull wire are wound around the corresponding annular grooves 1211 and fixed in the corresponding fixing holes 1212.

[0050] In some installation methods, one end of the first and second pull wires can first be inserted into the corresponding fixing hole 1212 through the corresponding annular groove 1211, and then connected to the fixing hole 1212 by bolt thread to press one end of the first and second pull wires together. Then, the first and second pull wires are wound in opposite directions in the corresponding annular groove 1211. The annular groove 1211 can prevent one end of the first and second pull wires from coming out, ensuring stability. In this way, the fixed winding connection with the planetary carrier 121 can be completed.

[0051] Combination Figure 6 and Figure 7 In one embodiment, the drive wheel assembly 13 includes a sun gear 131 and a bridge gear 132. The sun gear 131 is coaxially mounted with the planet carrier 121 via a rotating shaft 115. The sun gear 131 includes a small sun gear and a large sun gear integrally formed. The small sun gear is meshed between the three planet gears 122, and the large sun gear is meshed with the bridge gear 132. The bridge gear 132 is partially exposed outside the main housing 11.

[0052] In this embodiment, the small sun gear is driven to rotate by three planetary gears 122, which in turn drives the large sun gear to rotate, thereby increasing the speed ratio. The large sun gear then drives the bridge gear 132 to rotate, and finally the bridge gear 132 serves as the output to drive the continuously variable transmission (CVT) to perform speed change.

[0053] Specifically, the gear structure is exposed in the port 24 of the continuously variable transmission (CVT) and meshes with the exposed portion of the intermediate wheel 132. Thus, the intermediate wheel 132 drives the gear structure to perform gear shifting motion within the CVT. More specifically, the main housing 11 has a sleeve 113. The main housing 11 is fitted onto one end of the CVT 2 through the sleeve 113, and then fixed to one end of the CVT 2 by an end cap 25. The end cap 25 presses tightly against the sleeve 113, ensuring the main housing 11 is stably mounted on one end of the CVT 2. The intermediate wheel 132 partially exposes into the sleeve 113 and corresponds to the port 24 on the CVT 2, thereby connecting the intermediate wheel 132 to the internal structure of the CVT 2.

[0054] In one embodiment, a front cover 14 is provided on the front side of the main housing 11, and a rear cover 15 is provided on the rear side of the main housing 11. The two ends of the rotating shaft 115 are rotatably mounted on the front cover 14 and the rear cover 15.

[0055] In this embodiment, the front cover 14 and the rear cover 15 are used to cover the main housing 11 to protect the planetary carrier 12 and the drive wheel assembly 13 inside the main housing 11. They are also used to install the rotating shaft 115. The planetary carrier 121 and the sun gear 131 are coaxially mounted on the rotating shaft 115 to ensure stability.

[0056] This invention also provides a continuously variable transmission, including: a transmission body 21, a transmission mechanism 22 and a speed change mechanism 23, and a planetary gearbox 1 as described above;

[0057] The planetary gearbox 1 is located outside the transmission body 21, and the transmission mechanism 22 is located inside the transmission body 21 with one end protruding from the opening 24 of the transmission body 21. The drive wheel set 13 of the planetary gearbox 1 is connected and meshed with the end of the transmission mechanism 22 that protrudes from the transmission body 21, and is used to drive the transmission mechanism 22 to rotate. The gear shifting mechanism 23 is located inside the transmission body 21, and the transmission mechanism 22 is connected to the gear shifting mechanism 23, and is used to link the gear shifting mechanism 23 to swing to achieve gear shifting.

[0058] In this embodiment, the transmission mechanism 22 includes a screw 221 and a sliding member 222 threadedly connected to the screw 221. The screw 221 is disposed inside the main shaft 26 of the transmission body 21. One end of the screw 221 protrudes from the port 24 outside one end of the continuously variable transmission 2. One end of the screw 221 is a gear structure. One end of the screw 221 is meshed with the bridge wheel 132. The bridge wheel 132 can drive the screw 221 to rotate, so that the screw 221 can drive the sliding member 222 to move along the axial direction of the main shaft 26. The speed change mechanism 23 includes a steel ball oscillation system. The sliding member 222 is linked to the steel ball oscillation system. The sliding member 222 can drive the steel ball oscillation system to oscillate by sliding back and forth, so as to realize the continuously variable transmission.

[0059] Based on the above description, the working process of the entire continuously variable transmission is as follows: pulling the first or second cable causes the planetary carrier 12 to rotate, the planetary carrier 12 causes the drive wheel set 13 to rotate, the drive wheel set 13 causes the screw 221 to rotate, the screw 221 causes the slider 222 to move linearly, and the slider 222 causes the steel ball oscillation system to oscillate, thereby realizing the speed change.

[0060] This invention also provides a human-powered vehicle, including the continuously variable transmission 2 as described above.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A planetary gearbox, used in a continuously variable transmission (CVT), characterized in that, The planetary gearbox includes: The main housing is installed on the outside of the continuously variable transmission; The planetary support is rotatably mounted inside the main housing. A pull wire assembly, one end of which passes through the main housing and is connected to the planetary support, is used to pull the planetary support to rotate in both directions; The drive wheel assembly is rotatably mounted inside the main housing and connected to the planetary support. The drive wheel assembly is partially exposed outside the main housing. The continuously variable transmission (CVT) has a port, through which the exposed part of the drive wheel assembly is connected to the interior of the CVT to drive the CVT for gear shifting. The planetary carrier includes a planetary carrier and at least one planetary gear, all of which are rotatably mounted on the planetary carrier and simultaneously meshed with the drive wheel assembly; the cable assembly includes a first cable and a second cable, one end of which is connected to the planetary carrier in a clockwise and counterclockwise direction, respectively.

2. The planetary gearbox according to claim 1, characterized in that: The main housing is provided with an installation opening and a circular toothed groove arranged radially along the installation opening; The planetary carrier is installed in the mounting port, and the planetary gears are meshed in the circular toothed grooves.

3. The planetary gearbox according to claim 2, characterized in that: The planetary gears are provided in three and are circumferentially distributed on the planet carrier, and the drive wheel assembly is meshed and connected between the three planetary gears.

4. The planetary gearbox according to claim 2, characterized in that: The planetary carrier has multiple annular grooves on its outer circumference. The planetary carrier has two fixing holes inside. The annular grooves are connected to the fixing holes. One end of the first pull wire and the second pull wire are wound around the corresponding annular grooves and fixed in the corresponding fixing holes.

5. The planetary gearbox according to claim 4, characterized in that: The drive wheel assembly includes a sun gear and a bridge gear. The sun gear is coaxially mounted with the planet carrier via a set rotating shaft. The sun gear includes an integrally set small sun gear and a large sun gear. The small sun gear is meshed between the three planet gears, and the large sun gear is meshed with the bridge gear. The bridge gear is partially exposed outside the main housing.

6. The planetary gearbox according to claim 5, characterized in that: The main housing is provided with a sleeve, and the main housing is fitted onto one end of the continuously variable transmission through the sleeve. The bridge wheel portion is exposed to the sleeve and connected to the interior of the continuously variable transmission.

7. The planetary gearbox according to claim 5, characterized in that: The front of the main housing is provided with a front cover, and the rear of the main housing is provided with a rear cover. The two ends of the rotating shaft are rotatably mounted on the front cover and the rear cover.

8. A continuously variable transmission, characterized in that, include: The transmission body, transmission mechanism, and speed change mechanism further include the planetary gearbox as described in any one of claims 1 to 7; The planetary gearbox is located outside the transmission body, and the transmission mechanism is located inside the transmission body with one end protruding from the opening of the transmission body. The drive wheel set of the planetary gearbox is connected and meshed with the end of the transmission mechanism that protrudes from the transmission body, and is used to drive the transmission mechanism to rotate. The gear shifting mechanism is located inside the transmission body, and the transmission mechanism is connected to the gear shifting mechanism, and is used to link the gear shifting mechanism to swing to achieve gear shifting.

9. A human-powered vehicle, characterized in that, Including the continuously variable transmission as described in claim 8.

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