Gear box reducing mechanism

Abstract

The utility model relates to the technical field of gear boxes, in particular to a gear box reducing mechanism which comprises a box body, and an input shaft and an output shaft are arranged on the box body; the speed reducing mechanism is arranged in the box body and comprises a first transmission set, a second transmission set... an Nth transmission set in the direction from the input shaft to the output shaft, each transmission set comprises a planet wheel, a sun wheel, a planet carrier and a transmission shaft, and inner ring teeth meshed with the planet wheels are arranged at the positions, opposite to the planet wheels, in the box body; the Nth planet carrier is in transmission connection with the Nth transmission shaft, the Nth planet gear is rotationally connected to the Nth planet carrier, the Nth sun gear is coaxially connected to the (N-1) th transmission shaft, and the Nth planet gear is arranged on the outer edge of the Nth sun gear; the first sun gear in the first transmission set is coaxially connected to the input shaft. The output shaft, the transmission shaft and the planet carrier are arranged in a split mode, so that all transmission sets in the planet speed reducing mechanism can float and evenly load, and the service life of the transmission structure is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of speed reduction transmission device, and particularly to a gear box speed reduction mechanism. BACKGROUND

[0002] The planetary speed reduction mechanism is widely used in the fields of industrial robots, engineering machinery and automatic equipment due to its high transmission ratio, compact structure and load uniform distribution. In the traditional planetary speed reduction mechanism, the transmission shaft and the output shaft are often designed in an integrated manner, and a rigid shaft system is formed by integral forging or turning machining, aiming to simplify the assembly process and improve the structural stability. However, there are significant technical bottlenecks in the use of large torque and continuous heavy load working conditions such as stack platform lifting systems.

[0003] The integrated shaft is prone to stress concentration in the transition area such as shaft shoulder and key groove, and is prone to fatigue fracture after long-term high-load operation. When maintenance is needed, the integrated shaft needs to be replaced as a whole, resulting in an increase in downtime and maintenance cost. The existing machining process cannot guarantee the absolute concentricity of the integrated shaft, planetary carrier and bearing seat. The radial deflection under load aggravates the meshing misalignment of the gears, and further causes vibration noise and transmission efficiency decline. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to solve one of the problems in the background art.

[0005] To this end, the utility model provides a gear box speed reduction mechanism.

[0006] The utility model solves the technical problems by adopting the following technical scheme:

[0007] A gear box speed reduction mechanism, comprising,

[0008] A box body, the box body is provided with an input shaft and an output shaft;

[0009] A speed reduction mechanism, the speed reduction mechanism is arranged in the box body, the speed reduction mechanism is arranged between the input shaft and the output shaft, along the direction from the input shaft to the output shaft, the speed reduction mechanism comprises a first transmission group, a second transmission group, a Nth transmission group, each transmission group comprises a planetary gear, a sun gear, a planetary carrier and a transmission shaft, the box body is provided with an inner ring tooth engaged with the planetary gear at a position opposite to the planetary gear, the Nth transmission group comprises an Nth planetary gear, an Nth sun gear, an Nth planetary carrier and an Nth transmission shaft, the first transmission shaft, the second transmission shaft, the Nth transmission shaft are coaxially arranged between the input shaft and the output shaft, between a plurality of transmission groups, the Nth planetary carrier is in transmission connection with the Nth transmission shaft, the Nth planetary gear is rotatably connected to the Nth planetary carrier, the Nth sun gear is coaxially connected to the Nth-1 transmission shaft, the Nth planetary gear is arranged at the outer edge of the Nth sun gear and is engaged with the Nth sun gear; wherein the first sun gear in the first transmission group is coaxially connected to the input shaft.

[0010] Further, the Nth transmission group, the Nth planet carrier is connected with the Nth transmission shaft through the spline.

[0011] Further, the end face of at least one of the planet wheel and the corresponding planet carrier is provided with a needle baffle.

[0012] Further, the planet carrier is provided with a limiting pin, and the limiting pin cooperates with the needle baffle to fix the relative position between the needle baffle and the planet carrier.

[0013] Further, the hardness of the needle baffle is greater than the hardness of the planet carrier.

[0014] Further, the planet wheel is connected with the planet carrier through a pin shaft, the pin shaft is hollow, the planet wheel is provided with an oil channel communicating with the inside of the pin shaft, and the oil channel is used for oil supply between the planet wheel and the sun gear and between the planet wheel and the inner gear ring of the box.

[0015] Further, the oil channel is arranged along the radial direction of the planet wheel.

[0016] Further, each transmission group comprises a shell, and the shells of the plurality of transmission groups are connected with each other to form a box.

[0017] The beneficial effects of the utility model are that, in the application, the output shaft and the planet carrier adopt spline cooperation to transmit torque, and the spline has a certain side gap, so that the transmission groups in the planetary reduction mechanism can float and load uniformly, so that even under the working condition of heavy load, the fatigue fracture of the output shaft and the transmission shaft can be reduced. Moreover, the structure has low coaxial precision requirement for the output shaft and the transmission shaft, and can reduce the production cost and the maintenance cost.

[0018] In the application, the needle baffle is fixed on the end face of the planet carrier towards the planet wheel, so that the hard needle baffle avoids wearing the soft planet carrier, the end face of the planet carrier is not worn, and the planet wheel is not axially moved, so that the stability of the planet wheel installation and the operation precision are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in combination with the drawings and examples.

[0020] Figure 1 It is the structural schematic diagram of the gear box reduction mechanism in the utility model.

[0021] In the figure: 1, box; 2, output shaft; 21, drive gear; 3, input shaft; 4, first transmission group; 41, first transmission shaft; 42, first planet carrier; 43, first planetary gear; 44, first sun gear; 45, first housing; 5, second transmission group; 51, second transmission shaft; 52, second planet carrier; 53, second planetary gear; 54, second sun gear; 55, second housing; 6, third transmission group; 61, third transmission shaft; 62, third planet carrier; 63, third planetary gear; 64, third sun gear; 65, third housing; 7, needle baffle; 8, brake mechanism; 9, oil passage. DETAILED DESCRIPTION

[0022] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model.

[0023] In the description of the utility model, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the utility model, it is to be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] The gear box reduction mechanism comprises a box body 1, an output shaft 2, a reduction mechanism, a brake mechanism 8, and an input shaft 3. The brake mechanism 8 is arranged at one end of the box body 1. The input shaft 3 is connected with the brake mechanism 8. The brake mechanism 8 is connected with the reduction mechanism. The reduction mechanism is arranged in the box body 1. The output shaft 2 is connected with the reduction mechanism. The input shaft 3 is connected with an external driving mechanism to input a power source. The brake mechanism 8 and the reduction mechanism drive the output shaft 2 to rotate.

[0026] One end of the box body 1 is connected with the brake mechanism 8. The end of the box body 1 connected with the brake mechanism 8 is defined as an input end. The other end is defined as an output end. Specifically, the brake mechanism 8 comprises a brake shell and a brake device arranged in the brake shell. The brake shell is arranged at the end of the box body 1. The input shaft 3 penetrates the brake shell. The brake device is connected with the input shaft 3 and is used for emergency braking. The brake device can be a centrifugal brake device. In other embodiments, other brake structures can also be used. Thus, the brake mechanism 8 is arranged at one end of the box body 1 in an integrated structure. Thus, the maintenance and replacement of parts of the equipment are facilitated.

[0027] The output shaft 2 is rotatably connected at the end of the box body 1 away from the brake mechanism 8 through a first bearing. The output shaft 2 is coaxially arranged with the input shaft 3. The box body 1 is provided with a mounting hole through which the output shaft 2 penetrates. The first bearing is arranged between the inner circle of the mounting hole and the output shaft 2. The end of the box body 1 is provided with a first gland. The output shaft 2 penetrates the first gland and is sealed between the first gland through a sealing ring. The output shaft 2 is rotatably connected with the first gland. The side of the mounting hole close to the inside of the box body 1 is provided with a limiting step. The first gland is provided with a first boss. The first boss is inserted into the mounting hole. The limiting step and the first boss abut against the two sides of the first bearing, respectively. Thus, the axial position of the first bearing is limited.

[0028] The output end of the box body 1 is provided with a mounting shell. The mounting shell is arranged in a spaced manner with the box body 1. The mounting shell is arranged at the mounting position of the reduction gear box. The end of the output shaft 2 away from the box body 1 is inserted into the mounting shell and is rotatably connected with the mounting shell through a second bearing. The side of the mounting shell facing the box body 1 is provided with a second gland. The mounting shell is provided with a fixing bolt. The fixing bolt penetrates the top cover, the mounting shell and is connected with the second gland. The second gland is provided with a second boss. The second boss is inserted into the mounting shell. The other side of the mounting shell is provided with a top cover. The top cover is provided with a third boss. The third boss is inserted into the mounting shell. The second boss and the third boss abut against the two sides of the second bearing, respectively. Thus, the axial position of the second bearing is limited. Preferably, a lock wire is additionally arranged at the top cover to prevent the bolts from falling off due to the long-term operation vibration and being stuck in the gear rack.

[0029] The output shaft 2 is coaxially connected with an output gear, the output gear is used for cooperating with a rack installed on a lifting pile leg to control movement of the lifting pile leg, and the output gear is located between the box body 1 and the mounting shell. By adopting the above technical scheme, the output shaft 2 is supported by double bearings, the first bearing and the second bearing are arranged on the two sides of the output gear respectively, the output gear is in cantilever stress, the bearings are arranged on both sides, and the two bearings share the stress, so that the selection of the bearings can select smaller bearings, thereby saving cost and improving the safety factor in limited space. Preferably, the first bearing and the second bearing can adopt a large-clearance self-aligning roller bearing, which is more conducive to adapting to uneven stress caused by uneven installation and different centers on site, and improves the service life.

[0030] A through hole is coaxially formed in the output shaft 2, and a torque sensing device is arranged in the through hole to detect the output torque in real time, and when the overload reaches a certain degree, the power source is automatically cut off, thereby playing a monitoring and protection role.

[0031] The output shaft 2 and the input shaft 3 are connected through a speed reduction mechanism, the speed reduction mechanism is arranged in the box body 1, the speed reduction mechanism includes a plurality of transmission groups arranged in the axial direction of the output shaft 2, each transmission group includes a transmission shaft, a sun gear, a planet gear and a planet carrier, and the first transmission group 4, the second transmission group 5 and the Nth transmission group are sequentially arranged in the direction from the input shaft 3 to the output shaft 2, in the present application, the transmission groups are three, and in the direction from the input shaft 3 to the output shaft 2, they are the first transmission group 4, the second transmission group 5 and the third transmission group 6. The first transmission group 4 includes a first transmission shaft 41, a first sun gear 44, a first planet gear 43 and a first planet carrier 42, the second transmission group 5 includes a second transmission shaft 51, a second sun gear 54, a second planet gear 53 and a second planet carrier 52, and the third transmission group 6 includes a third transmission shaft 61, a third sun gear 64, a third planet gear 63 and a third planet carrier 62.

[0032] Specifically, the first transmission shaft 41, the second transmission shaft 51 and the third transmission shaft are coaxially arranged between the input shaft 3 and the output shaft 2 in sequence, the first transmission shaft 41 abuts against the end of the input shaft 3, the second transmission shaft 51 abuts against the end of the first transmission shaft 41 away from the input shaft 3, and the third transmission shaft 61 abuts against the end of the second transmission shaft 51 away from the first transmission shaft 41. The third transmission shaft 61 is coaxially and integrally arranged with the output shaft 2, the third planet carrier 62 is connected with the third transmission shaft 61 through a spline, the third planet gear 63 is rotationally connected to the third planet carrier 62 through a pin shaft, the third sun gear 64 is coaxially connected to the second transmission shaft 51, and the third planet gear 63 is arranged at the outer edge of the third sun gear 64 and meshes with the third sun gear 64; the second planet carrier 52 is connected with the second transmission shaft 51 through a spline, the second planet gear 53 is rotationally connected to the second planet carrier 52 through a pin shaft, the second sun gear 54 is coaxially connected to the first transmission shaft 41, and the second planet gear 53 is arranged at the outer edge of the second sun gear 54 and meshes with the second sun gear 54; the first planet carrier 42 is connected with the first transmission shaft 41 through a spline, the first planet gear 43 is rotationally connected to the first planet carrier 42 through a pin shaft, the first sun gear 44 is coaxially connected to the input shaft 3, and the first planet gear 43 is arranged at the outer edge of the first sun gear 44 and meshes with the first sun gear 44; the position opposite to the planet gear in the box 1 is provided with an inner ring gear meshing with the planet gear.

[0033] It should be noted that the end face of the planet gear and the corresponding planet carrier are provided with a needle roller baffle 7, and a positioning pin is arranged on the planet carrier. The limiting pin cooperates with the needle roller baffle 7 to fix the relative position between the needle roller baffle 7 and the planet carrier. Since the needle roller baffle 7 is harder than the planet carrier, fixing the needle roller baffle 7 and the planet carrier can prevent friction between the needle roller baffle 7 and the planet carrier, which causes the end face of the planet carrier to wear and the planet gear to axially move.

[0034] Preferably, one shell is correspondingly arranged outside each transmission group. The first transmission group 4 is correspondingly provided with a first shell 45, the second transmission group 5 is correspondingly provided with a second shell 55, and the third transmission group 6 is correspondingly provided with a third shell 65. The plurality of shells are connected together in sequence through connecting pieces to form the box 1, so as to realize modular installation of the speed reduction mechanism and facilitate maintenance.

[0035] Further, the pin shaft is hollow for connecting the planet wheel and the planet carrier, and the side wall of the pin shaft is provided with an oil hole, and each planet wheel is provided with an oil channel 9 along the radial direction of the planet wheel, and the oil hole is arranged opposite to the oil channel 9. In use, the lubricating oil is injected into the box 2, but the lubricating oil does not fill the box 1. When the planet wheel rotates to the lower side, the pin shaft planet wheel is in the lubricating oil, and the pin shaft is injected with lubricating oil. When the planet wheel rotates to the upper side, the planet wheel is not in contact with the lubricating oil, and the oil in the pin shaft is thrown out to the planet wheel, the sun gear and the inner ring gear through the oil hole and the oil channel 9 under the action of centrifugal force during rotation. When the planet wheel rotates to the lower side again, the lubricating oil is pressed into the pin shaft under the action of oil pressure to form a circulating live oil, which is beneficial to take away heat and avoid accumulation into dead oil to heat up.

[0036] In summary, the output shaft 2 and the planet carrier in the application adopt spline cooperation to transmit torque, and the spline has a certain side clearance, so that the transmission groups in the planetary reduction mechanism can float and load evenly, so that the fatigue fracture of the output shaft 2 and the transmission shaft can be reduced even in the working condition of heavy load. And the structure has lower coaxial precision requirement for the output shaft 2 and the transmission shaft, which can reduce the production cost and maintenance cost.

[0037] The application fixes the needle roller baffle 7 on the end face of the planet carrier towards the planet wheel, which avoids that the hard needle roller baffle 7 wears the soft planet carrier, causes the end face of the planet carrier to be worn, and the planet wheel to axially move, thereby improving the stability of the planet wheel installation and the operation accuracy.

[0038] Based on the above ideal embodiments of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined by the scope of the claims.

Claims

1. A gearbox reduction mechanism, characterized by, The utility model relates to a kind of gearboxes, including, Box (1), be provided with input shaft (3) and output shaft (2) on the box (1); Speed reduction mechanism, the speed reduction mechanism is arranged in box (1), the speed reduction mechanism is arranged between input shaft (3) and output shaft (2), in the direction of input shaft (3) to output shaft (2), the speed reduction mechanism includes: First transmission group (4), second transmission group (5) ……N transmission group, each transmission group includes planetary gear, sun gear, planet carrier and transmission shaft, the position of planetary gear in the box (1) is provided with the inner tooth ring engaged with planetary gear, the N transmission group includes N planetary gear, N sun gear, N planet carrier and N transmission shaft, the first transmission shaft (41) in the first transmission group (4), the second transmission shaft (51) in the second transmission group (5) ……N rotation shaft in the N transmission group are coaxially arranged between input shaft (3) and output shaft (2) in turn, between multiple transmission groups, N planet carrier is transmission connection with N transmission shaft, N planetary gear is rotationally connected on N planet carrier, N sun gear is coaxially connected on N-1 transmission shaft, N planetary gear is arranged on the outer edge of N sun gear and is engaged with N sun gear; Wherein, the first sun gear (44) in the first transmission group (4) is coaxially connected on input shaft (3).

2. The gearbox reduction mechanism of claim 1, wherein, In the N transmission group, the N planet carrier is connected with N transmission shaft by spline.

3. The gearbox reduction mechanism of claim 1, wherein, The end surface of at least one planetary gear and the corresponding planet carrier is provided with a needle plate (7).

4. The gearbox reduction mechanism of claim 3, wherein, The planet carrier is provided with a positioning pin, and the positioning pin cooperates with the needle plate (7) to fix the relative position between the needle plate (7) and the planet carrier.

5. The gearbox reduction mechanism of claim 4, wherein, The hardness of the needle plate (7) is greater than the hardness of the planet carrier.

6. The gearbox reduction mechanism of claim 1, wherein, The planetary gear is connected with the planet carrier through a pin shaft, the pin shaft is hollow, the planetary gear is provided with an oil channel (9) communicating with the inside of the pin shaft, and the oil channel (9) is used for oil supply between the planetary gear and the sun gear and between the planetary gear and the inner ring gear in the box (1).

7. The gearbox reduction mechanism of claim 6, wherein, The oil channel (9) is arranged along the radial direction of the planetary gear.

8. The gearbox reduction mechanism of claim 1, wherein, Each transmission group is correspondingly provided with an outer shell, and the plurality of outer shells are connected to form the box (1).

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