Gearbox and tensioning machine

Abstract

The utility model belongs to the technical field of gear boxes, and discloses a gear box and a tensioning machine. The gearbox comprises a box body, an input shaft, a first planetary mechanism and a second planetary mechanism, the first planetary mechanism and the second planetary mechanism are arranged in the box body, the second planetary mechanism is in transmission connection with the first planetary mechanism, one end of the input shaft extends into the box body and is in transmission connection with the first planetary mechanism, and the other end of the input shaft extends out of the box body. The connector is connected with driving equipment; one end of the output shaft is located in the box body and is in transmission connection with the second planetary mechanism, the other end of the output shaft extends out of the box body, and rotation of the input shaft is transmitted to the output shaft through the first planetary mechanism and the second planetary mechanism. The gearbox is provided with the first planetary mechanism and the second planetary mechanism to form a double-planetary transmission structure, and compared with an existing multi-stage parallel transmission structure, the overall dimension of the gearbox is greatly reduced, the weight of the gearbox is reduced, and daily use of the tensioning machine is greatly facilitated.

Description

Technical Field

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

[0002] Traditional tensioner gearboxes mainly use multi-stage parallel transmission structures or parallel plus orthogonal bevel gear structures for transmission. Because they have multiple parallel transmission shafts inside, the gearboxes are large in size and weight, requiring a large installation space, which brings considerable inconvenience to the daily use of the tensioner.

[0003] Therefore, there is an urgent need for a gearbox to solve the aforementioned problems in the prior art. Utility Model Content

[0004] The purpose of this utility model is to provide a gearbox and tensioner that can reduce the size and weight of the gearbox and has strong practicality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Gearbox, comprising:

[0007] Box;

[0008] A first planetary mechanism and a second planetary mechanism are disposed within the housing, with the second planetary mechanism being drive-connected to the first planetary mechanism;

[0009] An input shaft, one end of which extends into the housing and is connected to the first planetary mechanism, and the other end of which extends out of the housing for connection to a drive device;

[0010] An output shaft, one end of which is located inside the housing and is connected to the second planetary mechanism for transmission, and the other end of which extends out of the housing, wherein the rotation of the input shaft is transmitted to the output shaft through the first planetary mechanism and the second planetary mechanism.

[0011] Preferably, the input shaft extends along a first axis, the output shaft extends along a second axis, the first axis is perpendicular to the second axis, and both the first planetary mechanism and the second planetary mechanism are arranged along the second axis.

[0012] Preferably, the gearbox further includes a bevel gear set, which includes a meshing first bevel gear and a second bevel gear. The first bevel gear is disposed on the input shaft, and the second bevel gear is disposed on the first planetary mechanism. The rotation of the first bevel gear can drive the first planetary mechanism to rotate through the second bevel gear.

[0013] Preferably, the diameter of the first bevel gear is smaller than the diameter of the second bevel gear.

[0014] Preferably, the first planetary mechanism includes a first sun gear, a first planet gear, and a first planet carrier. The first planet gear is rotatably disposed on the first planet carrier and meshes with the gear ring portion of the housing. The first sun gear meshes with the first planet gear, and the second bevel gear is coaxially disposed on the first sun gear.

[0015] Preferably, the second planetary mechanism includes a second sun gear, a second planet gear, and a second planet carrier. The second planet gear is rotatably mounted on the second planet carrier and meshes with the gear ring portion. The second sun gear meshes with the second planet gear. The second sun gear is connected to the first planet carrier. Rotation of the first planet carrier can drive the second sun gear to rotate. The output shaft is mounted on the second planet carrier.

[0016] Preferably, the housing includes a first cover, a second cover, and a gear ring portion sandwiched between the first cover and the second cover. The gear ring portion is disposed on the second cover. The input shaft passes through the first cover, and the output shaft passes through the second cover. Both the first planetary mechanism and the second planetary mechanism are connected to the gear ring portion.

[0017] The first box cover has a mounting hole, and a connecting bolt passes through the mounting hole and is threaded to the gear ring. The head of the connecting bolt abuts against the first box cover.

[0018] Preferably, the mounting hole is waist-shaped and extends circumferentially along the first planetary mechanism.

[0019] Preferably, a sealing ring is provided between the first box cover and the toothed ring portion.

[0020] The tensioner includes the gearbox described above, and the output shaft is connected to the main shaft of the tensioner.

[0021] The beneficial effects of the present invention are:

[0022] The gearbox provided by this utility model includes a housing, an input shaft, an output shaft, a first planetary mechanism, and a second planetary mechanism. Both the first and second planetary mechanisms are housed inside the housing. Since the input shaft is connected to the drive device and extends into the housing for transmission through the first planetary mechanism, and since the second planetary mechanism is also connected to the first planetary mechanism, the drive device can drive the first planetary mechanism to rotate via the input shaft, thereby causing the second planetary mechanism to rotate. Because the output shaft is connected to the second planetary mechanism, and the rotation of the input shaft can be transmitted to the output shaft through the first and second planetary mechanisms, the gearbox can achieve normal torque output. This gearbox, with its first and second planetary mechanisms forming a double planetary transmission structure, significantly reduces the gearbox's external dimensions and weight compared to existing multi-stage parallel transmission structures, thereby reducing the installation space required in the tensioner and greatly facilitating the daily use of the tensioner.

[0023] The tensioning machine provided by this utility model adopts the aforementioned gearbox, which has a compact structure and high power density. While meeting the functions of daily use, it reduces the overall size and weight, making it highly practical. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the gearbox provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 100 - Connecting bolt;

[0027] 1-Box body; 11-First box cover; 12-Second box cover; 121-Gear ring section;

[0028] 2-Input axis;

[0029] 3-First planetary mechanism; 31-First sun wheel; 32-First planet wheel; 33-First planet carrier;

[0030] 4-Second planetary mechanism; 41-Output shaft; 42-Second sun gear; 43-Second planetary gear; 44-Second planet carrier;

[0031] 5-Bevel gear set; 51-First bevel gear; 52-Second bevel gear. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] like Figure 1As shown, this utility model provides a gearbox, which includes a housing 1, an input shaft 2, a first planetary mechanism 3, and a second planetary mechanism 4. The first planetary mechanism 3 and the second planetary mechanism 4 are both disposed inside the housing 1. The second planetary mechanism 4 is drivenly connected to the first planetary mechanism 3. One end of the input shaft 2 extends into the housing 1 and is drivenly connected to the first planetary mechanism 3, while the other end of the input shaft 2 extends out of the housing 1 for connection with a drive device. One end of the output shaft 41 is located inside the housing 1 and is drivenly connected to the second planetary mechanism 4, while the other end of the output shaft 41 extends out of the housing 1. The rotation of the input shaft 2 is transmitted to the output shaft 41 through the first planetary mechanism 3 and the second planetary mechanism 4. Since the input shaft 2 is connected to the drive device and extends into the housing 1 for transmission connection to the first planetary mechanism 3, and since the second planetary mechanism 4 is also for transmission connection to the first planetary mechanism 3, the drive device can drive the first planetary mechanism 3 to rotate through the input shaft 2, thereby driving the second planetary mechanism 4 to rotate. Since the output shaft 41 is for transmission connection to the second planetary mechanism 4, and the rotation of the input shaft 2 can be transmitted to the output shaft 41 through the first planetary mechanism 3 and the second planetary mechanism 4, the gearbox can achieve normal torque output. The gearbox is equipped with the first planetary mechanism 3 and the second planetary mechanism 4, forming a double planetary transmission structure. Compared with the existing multi-stage parallel transmission structure, while achieving normal double-stage deceleration and torque increase, it greatly reduces the external size and weight of the gearbox, thereby reducing the installation space of the gearbox in the tensioner and greatly facilitating the daily use of the tensioner.

[0037] Specifically, if Figure 1 As shown, the input shaft 2 extends along the first axis, and the output shaft 41 extends along the second axis. The first axis is perpendicular to the second axis. The first planetary mechanism 3 and the second planetary mechanism 4 are both set along the second axis. The input shaft 2 is perpendicular to the first planetary mechanism 3, which changes the transmission direction and improves the flexibility of the gearbox.

[0038] Furthermore, such as Figure 1 As shown, the gearbox also includes a bevel gear set 5, which includes a meshing first bevel gear 51 and a second bevel gear 52. The first bevel gear 51 is mounted on the input shaft 2, and the second bevel gear 52 is mounted on the first planetary mechanism 3. Rotation of the first bevel gear 51 can drive the first planetary mechanism 3 to rotate via the second bevel gear 52. The bevel gear set 5 can change the transmission direction of the input shaft 2, so that the gearbox does not need to be connected to the input shaft 2 along the axial direction of the first planetary mechanism 3. Therefore, the axial dimension of the gearbox is reduced while meeting the normal torque output requirements, making the structure of the gearbox and the tensioner more compact and flexible. Specifically, the first bevel gear 51 is mounted on the input shaft 2 and is integrally formed with the input shaft 2. The second bevel gear 52 is coaxially mounted with the first sun gear 31 and connected by a flat key. The axis of the input shaft 2 is perpendicular to the axis of the first sun gear 31.

[0039] Further, if Figure 1 As shown, the diameter of the first bevel gear 51 is smaller than the diameter of the second bevel gear 52. Therefore, the bevel gear set 5 can convert the high speed and low torque of the input shaft 2 into low speed and high torque and transmit it to the first sun gear 31, thereby achieving initial speed reduction and torque increase.

[0040] Specifically, such as Figure 1 As shown, the first planetary mechanism 3 includes a first sun gear 31, a first planet gear 32, and a first planet carrier 33. The first planet gear 32 is rotatably mounted on the first planet carrier 33 and meshes with the gear ring portion 121 of the housing 1. The first sun gear 31 meshes with the first planet gear 32. The second bevel gear 52 is coaxially mounted on the first sun gear 31. In this embodiment, the first planetary mechanism 3 is a planetary gear set commonly used in the art. The input shaft 2 is rotatably connected to the first sun gear 31 through the bevel gear set 5. The input shaft 2 can drive the first bevel gear 51 to rotate synchronously. The second bevel gear 52 drives the first sun gear 31 to rotate under the drive of the first bevel gear 51, thereby driving the first planetary mechanism 3 to operate.

[0041] Specifically, such as Figure 1 As shown, the second planetary mechanism 4 includes a second sun gear 42, a second planet gear 43, and a second planet carrier 44. The second planet gear 43 is rotatably mounted on the second planet carrier 44 and meshes with the gear ring 121. The second sun gear 42 meshes with the second planet gear 43. The second sun gear 42 is connected to the first planet carrier 33. The rotation of the first planet carrier 33 can drive the second sun gear 42 to rotate. The output shaft 41 is mounted on the second planet carrier 44. The first planetary mechanism 3 and the second planetary mechanism 4 form a double planetary transmission structure, which can perform double-stage speed reduction and torque amplification on the input shaft 2, increasing the transmission ratio and improving the power density. Specifically, the second planetary mechanism 4 is also a planetary gear set commonly used in the field. The end of the second sun gear 42 extends into the shaft hole of the first planetary carrier 33 and is keyed to the first planetary carrier 33. When the first sun gear 31 rotates, the first planet gear 32 rotates and meshes with the gear ring part 121 of the housing 1, thereby driving the first planetary carrier 33 to rotate. The first planetary carrier 33 then drives the second sun gear 42 to rotate, thereby making the second planetary mechanism 4 operate and ultimately achieving the reduced speed rotation of the output shaft 41.

[0042] It is understandable that the inner wall of the gear ring 121 is provided with teeth along the circumference, and the first planetary gear 32 and the second planetary gear 43 respectively mesh with the teeth, thereby smoothly realizing the rotational cooperation between the first planetary gear 32, the second planetary gear 43 and the housing 1 and the gear ring 121.

[0043] like Figure 1As shown, to facilitate the inspection and maintenance of the internal structure of the gearbox, the gearbox body 1 includes a first cover 11, a second cover 12, and a gear ring portion 121 sandwiched between the first cover 11 and the second cover 12. The gear ring portion 121 is disposed on the second cover 12. The input shaft 2 passes through the first cover 11, and the output shaft 41 passes through the second cover 12. The first planetary mechanism 3 and the second planetary mechanism 4 are both connected to the gear ring portion 121. The first cover 11 has a mounting hole, and the connecting bolt 100 passes through the mounting hole and is threaded to the gear ring portion 121. The head of the connecting bolt 100 abuts against the first cover 11. In addition, the second cover 12 and the gear ring portion 121 are also connected by bolts. When it is necessary to inspect the internal structure of the gearbox, the first cover 11 and the gear ring 121 can be separated by removing the connecting bolts 100. The first planetary mechanism 3 and the second planetary mechanism 4 inside the gearbox 1 can be inspected without dismantling the gearbox body 1, which greatly facilitates the maintenance work. At the same time, since the gearbox body 1 is composed of three parts connected by bolts, there is no need for the traditional mold opening and integral casting, thus greatly reducing the manufacturing cost.

[0044] It is understandable that, since the first planetary mechanism 3 and the second planetary mechanism 4 are arranged axially, the first planetary gear 32 and the second planetary gear 43 are distributed axially along the output shaft 41. Therefore, the inner wall of the gear ring portion 121 is provided with a first gear ring and a second gear ring at intervals along the axial direction, corresponding to the first planetary gear 32 and the second planetary gear 43. The first planetary gear 32 meshes with the first gear ring, and the second planetary gear 43 meshes with the second gear ring.

[0045] Specifically, the gear ring portion 121 is disposed in the second box cover 12, the second planetary mechanism 4 is disposed inside the gear ring portion 121 and the output shaft 41 passes through the second box cover 12, the first planetary gear 32 of the first planetary mechanism 3 is disposed inside the gear ring portion 121 and meshes with the first gear ring of the gear ring portion 121, one end of the first sun gear 31 is rotatably connected to the first planetary gear 32, the other end of the first sun gear 31 extends into the first box cover 11, the input shaft 2 passes through the first box cover 11, the axis of the input shaft 2 is perpendicular to the axis of the output shaft 41 and the input shaft 2 is rotatably connected to the first sun gear 31 through the bevel gear set 5.

[0046] Specifically, the gear ring 121 is connected to the second cover 12 by a long bolt, which is also connected to the bracket below, thereby fixing the gearbox 1 to the bracket. This eliminates the need for a mounting flange on the outside of the gearbox 1, thus reducing the space occupied by the mounting flange and further reducing the volume of the gearbox.

[0047] To improve the adaptability of the gearbox and ensure assembly accuracy, the mounting hole is oblong and extends circumferentially along the first planetary mechanism 3. When the flatness of the gearbox bracket welding is insufficient, causing the concentricity between the drive equipment and the tensioner spindle to not meet the requirements, the operator can loosen the connecting bolt 100 and then rotate the first gearbox cover 11 around the output shaft 41 to change the mounting angle of the first gearbox cover 11 relative to the gear ring 121. This will allow the axis of the input shaft 2 on the first gearbox cover 11 to be aligned with the drive equipment, thereby ensuring the assembly accuracy of the gearbox.

[0048] Specifically, a sealing ring is sandwiched between the first cover 11 and the toothed ring portion 121. The sealing ring ensures a good seal between the first cover 11 and the toothed ring portion 121, preventing the leakage of lubricating oil inside the box 1. Moreover, compared with the method of applying sealant, the sealing ring can be reused, thereby reducing the cost of use. For example, the sealing ring is an O-ring commonly used in the art.

[0049] This embodiment also provides a tensioning machine, which includes the aforementioned gearbox, with the output shaft 41 of the gearbox connected to the main shaft of the tensioning machine. This tensioning machine transmits power through the gearbox, featuring a compact structure and flexible arrangement. While meeting normal functional requirements, it reduces the overall size and weight, facilitating transportation and demonstrating strong practicality.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A gearbox, characterized in that, include: Box (1); The first planetary mechanism (3) and the second planetary mechanism (4) are disposed inside the housing (1), and the second planetary mechanism (4) is drivenly connected to the first planetary mechanism (3); An input shaft (2) has one end extending into the housing (1) and being connected to the first planetary mechanism (3), and the other end extending out of the housing (1) for connection to a drive device. Output shaft (41), one end of which is located inside the housing (1) and is connected to the second planetary mechanism (4) for transmission, and the other end of which extends out of the housing (1). The rotation of the input shaft (2) is transmitted to the output shaft (41) through the first planetary mechanism (3) and the second planetary mechanism (4).

2. The gearbox according to claim 1, characterized in that, The input shaft (2) extends along the first axis, and the output shaft (41) extends along the second axis. The first axis is perpendicular to the second axis, and the first planetary mechanism (3) and the second planetary mechanism (4) are both arranged along the second axis.

3. The gearbox according to claim 2, characterized in that, The gearbox also includes a bevel gear set (5), which includes a first bevel gear (51) and a second bevel gear (52) meshing with each other. The first bevel gear (51) is disposed on the input shaft (2), and the second bevel gear (52) is disposed on the first planetary mechanism (3). The rotation of the first bevel gear (51) can drive the first planetary mechanism (3) to rotate through the second bevel gear (52).

4. The gearbox according to claim 3, characterized in that, The diameter of the first bevel gear (51) is smaller than the diameter of the second bevel gear (52).

5. The gearbox according to claim 3, characterized in that, The first planetary mechanism (3) includes a first sun gear (31), a first planet gear (32) and a first planet carrier (33). The first planet gear (32) is rotatably mounted on the first planet carrier (33) and meshes with the gear ring portion (121) of the housing (1). The first sun gear (31) meshes with the first planet gear (32). The second bevel gear (52) is coaxially mounted on the first sun gear (31).

6. The gearbox according to claim 5, characterized in that, The second planetary mechanism (4) includes a second sun gear (42), a second planet gear (43), and a second planet carrier (44). The second planet gear (43) is rotatably mounted on the second planet carrier (44) and meshes with the gear ring (121). The second sun gear (42) meshes with the second planet gear (43). The second sun gear (42) is connected to the first planet carrier (33). The rotation of the first planet carrier (33) can drive the second sun gear (42) to rotate. The output shaft (41) is mounted on the second planet carrier (44).

7. The gearbox according to claim 1, characterized in that, The housing (1) includes a first cover (11), a second cover (12), and a gear ring (121) sandwiched between the first cover (11) and the second cover (12). The gear ring (121) is disposed on the second cover (12). The input shaft (2) passes through the first cover (11), and the output shaft (41) passes through the second cover (12). The first planetary mechanism (3) and the second planetary mechanism (4) are both connected to the gear ring (121). The first box cover (11) has a mounting hole, and the connecting bolt (100) passes through the mounting hole and is threaded to the gear ring (121). The head of the connecting bolt (100) abuts against the first box cover (11).

8. The gearbox according to claim 7, characterized in that, The mounting hole is waist-shaped and extends circumferentially along the first planetary mechanism (3).

9. The gearbox according to claim 7, characterized in that, A sealing ring is sandwiched between the first box cover (11) and the toothed ring portion (121).

10. A tensioning machine, characterized in that, The gearbox includes any one of claims 1-9, wherein the output shaft (41) is connected to the main shaft of the tensioner.

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