Gearbox

Abstract

The utility model belongs to the technical field of gearboxes, and particularly relates to a gearbox which comprises a box body, an input wheel set, a worm, a worm wheel and an output wheel set. The output wheel set comprises a transmission gear set and an output shaft, and the transmission gear set is meshed with the input wheel set and is in transmission connection with the output shaft; the worm gear is sleeved on the transmission gear set; when external power drives the input wheel set to rotate, the input wheel set drives the transmission gear set to rotate so as to drive the output shaft to rotate, and at the moment, the spindle rotating speed of the input wheel set is the same as that of the output shaft; when external power drives the worm to rotate, the worm drives the worm gear to rotate, the worm gear drives the output shaft to rotate through the transmission gear set, and at the moment, the main shaft rotating speed of the input wheel set is different from the output shaft rotating speed. The output shaft can be directly driven by the input wheel set to achieve constant-speed transmission, the output shaft can be driven by the worm and the worm gear to achieve speed reduction transmission, the diversified requirements of different working scenes for the rotating speed and torque can be met, and the applicability and flexibility of equipment are improved.

Description

Technical Field

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

[0002] In the field of modern mechanical transmission, the gearbox, as a core component, is widely used in automobiles, construction machinery, ships, and other equipment, and its technological evolution is closely linked to industrial development. Early mechanical transmission systems relied on fixed gear ratios, which could not adapt to the dynamic demands of speed and torque under complex operating conditions, resulting in low efficiency and inconvenient operation. Traditional manual transmissions (MT), while achieving gear changes through multi-stage gear sets, required the driver to manually engage and disengage the clutch and shift gears, making operation cumbersome and prone to power interruption, especially in scenarios with frequent start-stop cycles, leading to a poor driving experience. With the increasing demand for automation, automatic transmissions (AT) emerged, achieving automatic shifting through a torque converter and planetary gear sets, significantly improving driving comfort, but with lower transmission efficiency and a complex structure. Dual-clutch transmissions (DCT) combine the advantages of manual and automatic transmissions, achieving rapid gear changes through the alternating operation of two clutches, improving transmission efficiency, but still lacking in low-speed smoothness. Continuously variable transmissions (CVT) use steel belts or chains for transmission, achieving continuous changes in the gear ratio, resulting in better fuel economy, but with limited load-bearing capacity, making them unsuitable for high-torque scenarios.

[0003] In summary, there is an urgent need for a new type of gearbox structure that can achieve lightweight, low noise, long life and high environmental adaptability while ensuring high transmission efficiency and load-bearing capacity, in order to meet the technological upgrading needs of intelligent manufacturing and green energy. Utility Model Content

[0004] The purpose of this utility model is to provide a gearbox that solves the technical problems of complex structure and large size of existing gearboxes.

[0005] To achieve the above objectives, this utility model provides a gearbox comprising a housing, an input wheel assembly, a worm gear, a worm wheel, and an output wheel assembly. The housing contains a cavity, within which the input wheel assembly, the worm gear, and the output wheel assembly are all disposed. The input wheel assembly is rotatable within the housing. The output wheel assembly includes a transmission gear set and an output shaft. The transmission gear set meshes with the input wheel assembly and is drively connected to the output shaft. The worm wheel is sleeved on the transmission gear set, and the worm gear is drively connected to the worm wheel. When an external power drives the input wheel assembly to rotate, the input wheel assembly drives the transmission gear set to rotate, thereby driving the output shaft to rotate. At this time, the main shaft speed of the input wheel assembly is the same as the output shaft speed. When an external power drives the worm gear to rotate, the worm gear drives the worm wheel to rotate, and the worm wheel drives the output shaft to rotate via the transmission gear set. At this time, the main shaft speed of the input wheel assembly is different from the output shaft speed.

[0006] Optionally, the transmission gear set includes a driven gear, a first bevel gear, a second bevel gear, and a third bevel gear; the output shaft passes sequentially through the first bevel gear and the third bevel gear; the driven gear is sleeved outside the first bevel gear, and the worm gear is sleeved outside the third bevel gear; the second bevel gear is located between the first bevel gear and the third bevel gear, and meshes with the first bevel gear and the third bevel gear; the second bevel gear is connected to the output shaft.

[0007] Optionally, the number of the second bevel gears is two, and the two second bevel gears are arranged opposite each other and both mesh with the first bevel gear and the third bevel gear.

[0008] Optionally, the output shaft includes a connector, one end of which extends into the second bevel gear and is connected to a bearing within the second bevel gear.

[0009] Optionally, the connector is provided with a through hole through which the output shaft passes.

[0010] Optionally, the connector is provided with a keyway, which is axially parallel to and connected to the through hole.

[0011] Optionally, the output shaft is provided with a mounting groove for mounting a positioning element, which matches the keyway.

[0012] Optionally, the connector is provided with a connecting hole, which is axially perpendicular to and communicates with the through hole.

[0013] Optionally, the input gear set includes an input shaft and a drive gear; both ends of the input shaft are rotatably connected to the housing; the drive gear is sleeved on the input shaft and meshes with the transmission gear set.

[0014] Optionally, the housing includes a base and a top cover, the base having a slot, and the cavity being formed between the top cover and the base; the top cover and the base are detachably connected.

[0015] The gearbox provided in this embodiment of the present invention has at least one of the following technical effects: The gearbox has two different transmission methods: it can achieve constant speed transmission by directly driving the output shaft through the input wheel set, or it can achieve speed reduction transmission by driving the output shaft through a worm gear. This meets the diverse speed and torque requirements of different working scenarios, improving the applicability and flexibility of the equipment. The components are rationally arranged within the gearbox, with the input wheel set, worm gear, and output wheel set working collaboratively within a limited space. In particular, the vertical staggered arrangement of the worm gear effectively utilizes space, making the overall structure of the gearbox compact and reducing the space occupied by the equipment, making it suitable for applications with high space requirements. In the mode where the input wheel set directly drives the output shaft, there is no complex reduction mechanism during transmission, reducing energy loss and achieving high transmission efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the gearbox provided in an embodiment of this utility model.

[0018] Figure 2 This is a structural schematic diagram of the gearbox from another perspective, provided as an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the input wheel assembly, worm gear, worm, and output wheel assembly provided for an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the output wheel assembly and worm gear provided in an embodiment of the present invention.

[0021] Figure 5 An exploded view of the structure of the output shaft and the second bevel gear provided in an embodiment of this utility model.

[0022] The following are the labeling elements in the figure:

[0023] Box 10, base 11, top cover 12, threaded hole 111, input gear set 20, input shaft 21, driving gear 22, worm 30, worm wheel 40, output gear set 50, transmission gear set 51, output shaft 52, connector 53, driven gear 511, first bevel gear 512, second bevel gear 513, third bevel gear 514, mounting groove 521, through hole 531, keyway 532, connecting hole 533, cavity 60. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The following description is based on the accompanying drawings. Figures 1-5 The described embodiments are exemplary and intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, 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.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 embodiment of the invention according to the specific circumstances.

[0028] In one embodiment of this utility model, such as Figures 1-5As shown, a gearbox is provided, including a housing 10, an input gear set 20, a worm gear 30, a worm wheel 40, and an output gear set 50. A cavity 60 is provided inside the housing 10, and the input gear set 20, worm gear 30, and output gear set 50 are all disposed within the cavity 60. The input gear set 20 is rotatable within the housing 10. The output gear set 50 includes a transmission gear set 51 and an output shaft 52. The transmission gear set 51 meshes with the input gear set 20 and is drively connected to the output shaft 52. The worm wheel 40 is sleeved on the transmission gear set 51. 1. The worm 30 and worm wheel 40 are connected in a transmission connection. When an external power drives the input gear set 20 to rotate, the input gear set 20 drives the transmission gear set 51 to rotate, thereby driving the output shaft 52 to rotate. At this time, the main shaft speed of the input gear set 20 is the same as the speed of the output shaft 52. When an external power drives the worm 30 to rotate, the worm 30 drives the worm wheel 40 to rotate, and the worm wheel 40 drives the output shaft 52 to rotate through the transmission gear set 51. At this time, the main shaft speed of the input gear set 20 is different from the speed of the output shaft 52. The input shaft 21 and the worm 30 are arranged in a spatially perpendicular staggered layout, which can shorten the transmission chain length and optimize the spatial layout.

[0029] Specifically, the input gear set 20, worm gear 30, and output gear set 50 are all located within the cavity 60 of the housing 10. The input gear set 20 and worm gear 30 are arranged opposite each other in the horizontal direction, and their axes are parallel to each other. The output shaft 52 is located below the input gear set 20 and worm gear 30 and is perpendicular to them. The worm wheel 40 is fitted onto the output shaft 52, located on one side of the worm gear 30, enabling effective meshing and transmission between the worm gear 30 and the worm wheel 40. The teeth of the input gear set 20 mesh with those of the transmission gear set 51. The positional relationship of the teeth of the input gear set 20 and the transmission gear set 51 within the housing 10 ensures normal contact and transmission between the teeth. Furthermore, the central axis of the input gear set 20 is parallel to the central axis of the transmission gear set 51 to ensure smooth power transmission.

[0030] Input gear set 20 directly drives output shaft 52: When external power drives input gear set 20 to rotate, the teeth of input gear set 20 drive the transmission gear set 51 meshing with it to rotate. Since transmission gear set 51 is fixedly connected to output shaft 52 by a key, the rotation of transmission gear set 51 will drive output shaft 52 to rotate synchronously. In this case, the main shaft speed of input gear set 20 is the same as the speed of output shaft 52. At this time, the gearbox plays the role of directly transmitting power and does not achieve the function of speed reduction.

[0031] Worm 30 and worm wheel 40 drive output shaft 52: When external power drives worm 30 to rotate, the helical teeth of worm 30 interact with the teeth of worm wheel 40, causing worm wheel 40 to rotate. Because worm wheel 40 is mounted on transmission gear set 51, the rotation of worm wheel 40 will drive output shaft 52 to rotate. Since the tooth ratio between worm 30 and worm wheel 40 is usually large, in this case, the spindle speed of input gear set 20 is different from the speed of output shaft 52, achieving a speed reduction function. The worm 30 and worm wheel 40 transmission has the characteristics of large transmission ratio and compact structure, which can effectively reduce the speed of output shaft 52 while increasing output torque.

[0032] Thus, this gearbox possesses two different transmission methods: it can achieve constant-speed transmission by directly driving the output shaft 52 through the input wheel set 20, or it can achieve speed reduction transmission by driving the output shaft 52 through the worm gear 30 and worm wheel 40. This can meet the diverse speed and torque requirements of different working scenarios, improving the applicability and flexibility of the equipment. The components are rationally arranged within the housing 10, with the input wheel set 20, worm gear 30, and output wheel set 50 working collaboratively within a limited space. In particular, the vertical staggered arrangement of the worm gear 30 and worm wheel 40 effectively utilizes space, resulting in a compact overall structure and reduced space occupation, making it suitable for applications with high space requirements. In the mode where the input wheel set 20 directly drives the output shaft 52, the transmission process does not involve a complex reduction mechanism, reducing energy loss and achieving high transmission efficiency.

[0033] In this example, the housing 10 includes a base 11 and a top cover 12. The base 11 has a slot, and a cavity 60 is formed between the top cover 12 and the base 11. The top cover 12 and the base 11 are detachably connected. Specifically, the base 11 has a threaded hole 111, and the top cover 12 and the base 11 are connected by high-strength bolts. Furthermore, the mating surface between the top cover 12 and the base 11 can be sealed with sealant or a rubber gasket to prevent lubricating oil leakage. The side wall of the base 11 is provided with a bearing seat for fixing the bearings of the input shaft 21, the worm gear 30, and the output shaft 52. The base 11 and the top cover 12 are modularly designed for easy disassembly and maintenance.

[0034] In this example, the transmission gear set 51 includes a driven gear 511, a first bevel gear 512, a second bevel gear 513, and a third bevel gear 514; the output shaft 52 passes sequentially through the first bevel gear 512 and the third bevel gear 514; the driven gear 511 is sleeved outside the first bevel gear 512, and the worm gear 40 is sleeved outside the third bevel gear 514; the second bevel gear 513 is located between the first bevel gear 512 and the third bevel gear 514, and meshes with both the first bevel gear 512 and the third bevel gear 514; the second bevel gear 513 is connected to the output shaft 52. Specifically, neither the first bevel gear 512 nor the third bevel gear 514 contacts the output shaft 52. The teeth of the second bevel gear 513 mesh with those of the first and third bevel gears. When the first or third bevel gear 514 rotates, the force between the teeth drives the second bevel gear 513 to rotate, and vice versa. The components are arranged compactly around the output shaft 52, making full use of space and resulting in a compact structure for the entire transmission gear set 51. This design not only reduces the overall size of the gearbox and the space it occupies, but also facilitates installation and maintenance, making it suitable for applications with high space requirements.

[0035] When the driven gear 511 receives power from the input gear set 20 and begins to rotate, it drives the first bevel gear 512 to rotate because the driven gear 511 is connected to the first bevel gear 512 via a key. After the first bevel gear 512 rotates, its teeth interact with the teeth of the second bevel gear 513, causing the second bevel gear 513 to rotate. At this time, the third bevel gear 514 is stationary relative to the first bevel gear 512 and the second bevel gear 513, and the rotation of the second bevel gear 513 simultaneously drives the output shaft 52 to rotate.

[0036] Similarly, when an external power drives the worm 30 to rotate, and the worm 30 drives the worm wheel 40 to rotate, the worm wheel 40 drives the third bevel gear 514, which is interference-fitted with it, to rotate. The third bevel gear 514 then transmits the power to the output shaft 52 through the second bevel gear 513, thus realizing different power transmission paths and speed changes.

[0037] In this example, there are two second bevel gears 513, which are arranged opposite each other and mesh with both the first bevel gear 512 and the third bevel gear 514. Specifically, the rotation of the first bevel gear 512 and the third bevel gear 514 will drive the two meshed second bevel gears 513 to rotate respectively. Because the two second bevel gears 513 are arranged opposite each other, they can distribute the force more evenly during the meshing process with the first and third bevel gears, reducing the load on individual bevel gears, lowering the risk of gear wear and damage, and thus improving the stability and reliability of the entire transmission system.

[0038] In this example, the output shaft 52 includes a connector 53, one end of which extends into the second bevel gear 513 and connects to a bearing within the second bevel gear 513. Specifically, the connection between the output shaft 52 connector 53 and the bearing within the second bevel gear 513 effectively reduces friction and vibration during the rotation of the output shaft 52, making the entire transmission system operate more smoothly. Simultaneously, the symmetrical arrangement of the two second bevel gears 513 further optimizes the force distribution, reducing vibration and noise caused by uneven force distribution, and improving the operational stability and reliability of the equipment.

[0039] In this example, the connector 53 has a through hole 531 through which the output shaft 52 passes. The connector 53 also has a keyway 532, which is axially parallel to and communicates with the through hole 531. The output shaft 52 has a mounting groove 521 for mounting a positioning element, which matches the keyway 532. Specifically, the output shaft 52 passes through the through hole 531 of the connector 53, and the mounting groove 521 on the output shaft 52 mounts the positioning element, which matches the keyway 532 on the connector 53, which is axially parallel to and communicates with the through hole 531. This fit is similar to a variation of a spline connection; the fit between the positioning element and the keyway 532 fixes the output shaft 52 and the connector 53 circumferentially, enabling torque transmission while allowing the output shaft 52 to move axially within a certain range.

[0040] In this example, the connector 53 is provided with a connecting hole 533, which is axially perpendicular to and communicates with the through hole 531. Specifically, the connection hole 533 can strengthen the connection between the output shaft 52 and the connector 53 through additional fixing methods (such as fixing pins or bolts), so that the output shaft 52 can work more stably with the connector 53 under complex working conditions (such as high-speed operation, frequent start-stop, and bearing large impact loads), reducing the risk of axial movement and circumferential slippage, and improving the reliability of the entire transmission system.

[0041] In this example, the input gear set 20 includes an input shaft 21 and a drive gear 22. Both ends of the input shaft 21 are rotatably connected to the housing 10. The drive gear 22 is sleeved on the input shaft 21 and meshes with the transmission gear set 51. Specifically, when an external power source (such as a motor) transmits power to the input shaft 21, the input shaft 21 begins to rotate. Since the drive gear 22 is connected to the input shaft 21 via a key, the rotation of the input shaft 21 will drive the drive gear 22 to rotate synchronously. When the drive gear 22 rotates, its teeth interact with the teeth of the driven gear 511 in the transmission gear set 51, transmitting power to the driven gear 511. The driven gear 511 then transmits power sequentially to other gears in the transmission gear set 51 (such as the first bevel gear 512 and the second bevel gear 513), ultimately driving the output shaft 52 to rotate.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gearbox, characterized in that: The device includes a housing, an input wheel assembly, a worm gear, a worm wheel, and an output wheel assembly. The housing contains a cavity, within which the input wheel assembly, worm gear, and output wheel assembly are all housed. The input wheel assembly is rotatable within the housing. The output wheel assembly includes a transmission gear set and an output shaft. The transmission gear set meshes with the input wheel assembly and is drively connected to the output shaft. The worm wheel is mounted on the transmission gear set, and the worm gear is drively connected to the worm wheel. When an external power drives the input wheel assembly to rotate, the input wheel assembly drives the transmission gear set to rotate, thereby driving the output shaft to rotate. In this case, the main shaft speed of the input wheel assembly is the same as the output shaft speed. When an external power drives the worm gear to rotate, the worm gear drives the worm wheel to rotate, and the worm wheel drives the output shaft to rotate via the transmission gear set. In this case, the main shaft speed of the input wheel assembly is different from the output shaft speed.

2. The gearbox according to claim 1, characterized in that: The transmission gear set includes a driven gear, a first bevel gear, a second bevel gear, and a third bevel gear; the output shaft passes sequentially through the first bevel gear and the third bevel gear; the driven gear is sleeved outside the first bevel gear, and the worm gear is sleeved outside the third bevel gear; The second bevel gear is located between the first bevel gear and the third bevel gear, and meshes with the first bevel gear and the third bevel gear; the second bevel gear is connected to the output shaft.

3. The gearbox according to claim 2, characterized in that: The number of the second bevel gears is two, and the two second bevel gears are arranged opposite each other and both mesh with the first bevel gear and the third bevel gear.

4. The gearbox according to claim 2, characterized in that: The output shaft includes a connector, one end of which extends into the second bevel gear and is connected to a bearing inside the second bevel gear.

5. The gearbox according to claim 4, characterized in that: The connector is provided with a through hole through which the output shaft passes.

6. The gearbox according to claim 5, characterized in that: The connector is provided with a keyway, which is axially parallel to and connected to the through hole.

7. The gearbox according to claim 6, characterized in that: The output shaft is provided with a mounting groove for mounting a positioning component, which matches the keyway.

8. The gearbox according to claim 5, characterized in that: The connector is provided with a connecting hole, which is axially perpendicular to and communicates with the through hole.

9. The gearbox according to any one of claims 1 to 8, characterized in that: The input gear set includes an input shaft and a drive gear; both ends of the input shaft are rotatably connected to the housing; the drive gear is sleeved on the input shaft and meshes with the transmission gear set.

10. The gearbox according to any one of claims 1 to 8, characterized in that: The housing includes a base and a top cover. The base has a slot, and the cavity is formed between the top cover and the base. The top cover and the base are detachably connected.

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