Lubricating structure of reduction gear box

Abstract

The utility model relates to the technical field of transmission lubricating structures, in particular to a lubricating structure of a reduction gear box. The planetary speed reducing mechanism is arranged in the box body, the planetary speed reducing mechanism is arranged between the input shaft and the output shaft on the box body, the planetary speed reducing mechanism comprises a first transmission group, a second transmission group... an Nth transmission group, and each transmission group comprises a transmission shaft and a transmission tooth assembly arranged on the 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 in sequence; the Nth transmission shaft coaxially abuts against the (N-1) th transmission shaft through an abutting face, and the abutting face is a plane. The lubricating structure comprises oil ducts arranged in the transmission shaft and the input shaft and oil grooves formed in the abutting face, and the oil grooves communicate with the inner space of the box body and the opposite oil ducts. Internal oil storage and external oil immersion are achieved through cooperation of the oil grooves and the oil channels, so that friction loss between shafts is reduced, and axial coaxial precision and clearance control are accurately achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission lubrication structure, in particular to a lubrication structure of a reduction gear box. BACKGROUND

[0002] In the existing planetary reduction mechanism, the top block between adjacent transmission shafts is a ball top. After machining a center hole on the cooperating shaft, it is easy to cause the axial play of the planetary reduction mechanism to deviate from the original design play, causing abnormal impact, noise and vibration. Especially after lubricating the oil into the gear box, the matching relationship of the ball top makes the coaxiality between the shafts of the planetary reduction mechanism worse, and the deflection between the shafts is intensified, thereby affecting the service life of the parts and further affecting the reliability of the gear box. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to solve one of the problems in the background art.

[0004] To this end, the present application provides a lubrication structure of a reduction gear box.

[0005] The technical scheme adopted by the present application to solve its technical problems is:

[0006] A lubrication structure of a reduction gear box, the reduction gear box comprising

[0007] a box body, the box body being provided with an input shaft and an output shaft, the box body being provided with an oil inlet and an oil outlet;

[0008] a planetary reduction mechanism, the planetary reduction mechanism being arranged in the box body, the planetary reduction mechanism being arranged between the input shaft and the output shaft, in the direction from the input shaft to the output shaft, the planetary reduction mechanism comprising a first transmission group, a second transmission group,..., and an Nth transmission group, each of the transmission groups comprising a transmission shaft and a transmission gear assembly arranged on the transmission shaft, the first transmission shaft, the second transmission shaft,..., and the Nth transmission shaft being coaxially arranged between the input shaft and the output shaft in sequence;

[0009] the end of the Nth transmission shaft being provided with an abutting surface, the Nth transmission shaft being coaxially abutted with the N-1th transmission shaft through the abutting surface, the first transmission shaft being coaxially abutted with the input shaft through the abutting surface, the abutting surface being a plane;

[0010] the lubrication structure comprising an oil channel arranged in the transmission shaft and the input shaft, and an oil groove arranged on the abutting surface, the oil groove being in communication with the internal space of the box body and the opposite oil channel.

[0011] Further, the end of the Nth transmission shaft is provided with an abutting boss for abutting with the N-1th transmission shaft and the input shaft, and the abutting surface is arranged on the abutting boss.

[0012] Further, the outer diameter of the abutting boss is greater than or equal to the inner diameter of the oil passage.

[0013] Further, the inner ring gear is arranged in the box body, the transmission gear assembly in the Nth transmission group comprises an Nth planetary gear, an Nth sun gear and an Nth planet carrier, the Nth planetary gear is rotationally arranged on the Nth planet carrier through a pin shaft, the Nth planet carrier is connected with an Nth transmission shaft, the Nth sun gear is coaxially connected on an N-1th transmission shaft, wherein the first sun gear in the first transmission group is coaxially connected on an input shaft, and the Nth planetary gear is engaged between the Nth sun gear and the inner ring gear.

[0014] Further, the lubricating structure further comprises,

[0015] A through hole is arranged in the pin shaft, and the through hole penetrates at least one end of the pin shaft;

[0016] An oil passing hole is arranged on the planetary gear, and the oil passing hole is communicated with the through hole through an oil hole arranged on the pin shaft.

[0017] Further, the oil passing hole is arranged in the radial direction of the planetary gear in the axial direction.

[0018] Further, a plurality of oil passing holes are arranged in the circumferential direction of the planetary gear.

[0019] Further, the Nth planet carrier and the Nth transmission shaft are connected through a spline.

[0020] Further, a needle roller baffle is arranged between the end face of the Nth planet carrier and the Nth planetary gear, and the needle roller baffle is fixedly connected with the Nth planet carrier.

[0021] The beneficial effects of the utility model are that the abutting surface between transmission shafts in the planetary reduction mechanism is changed into a plane abutting surface, an oil groove is arranged on the abutting surface, an oil passage is arranged in the transmission shaft, the abutting boss is matched with the end face of the transmission shaft, the contact friction area between transmission shafts is reduced, the internal oil storage and external oil immersion are realized through the cooperation of the oil groove and the oil passage, the friction loss at the place is reduced, the heat generation is reduced, the efficiency of the gear box is improved, the precise operation is ensured, and the axial coaxial precision and the play control are accurately realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model is further described below in combination with the drawings and examples.

[0023] Figure 1 It is a structural schematic view of the reduction gear box in the utility model.

[0024] Figure 2 It is an enlarged view of A part for reflecting the lubricating structure in the utility model.

[0025] In the figure: 1, box; 11, output shaft; 12, input shaft; 2, first transmission group; 21, first transmission shaft; 22, first planetary carrier; 23, first planetary gear; 24, first sun gear; 25, first housing; 26, abutting boss; 27, oil groove; 3, second transmission group; 31, second transmission shaft; 32, second planetary carrier; 33, second planetary gear; 34, second sun gear; 35, second housing; 4, third transmission group; 41, third transmission shaft; 42, third planetary carrier; 43, third planetary gear; 44, third sun gear; 45, third housing; 5, needle roller baffle; 6, oil passage; 7, oil passage hole; 8, pin shaft; 9, through hole. DETAILED DESCRIPTION

[0026] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, so they only show the structure related to the utility model.

[0027] 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 therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting 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.

[0028] 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 between 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.

[0029] The application discloses a lubricating structure of a reduction gear box, which is arranged in the reduction gear box.

[0030] The output shaft 11 and the input shaft 12 are connected through a planetary reduction mechanism, the planetary reduction mechanism is arranged in the box body 1, the planetary reduction mechanism comprises a plurality of transmission groups arranged along the axial direction of the output shaft 11, each transmission group comprises a transmission shaft, a sun gear, a planet gear and a planet carrier, and the first transmission group 2, the second transmission group 3 and the Nth transmission group are sequentially arranged along the direction from the input shaft 12 to the output shaft 11, in the application, the transmission groups are three, along the direction from the input shaft 12 to the output shaft 11, the first transmission group 2, the second transmission group 3 and the third transmission group 4.

[0031] Specifically, the first transmission shaft 21, the second transmission shaft 31 and the third transmission shaft are coaxially arranged between the input shaft 12 and the output shaft 11 in sequence, the first transmission shaft 21 abuts against the end portion of the input shaft 12, the second transmission shaft 31 abuts against the end portion of the first transmission shaft 21 away from the input shaft 12, and the third transmission shaft 41 abuts against the end portion of the second transmission shaft 31 away from the first transmission shaft 21.

[0032] The third transmission shaft 41 is coaxially and integrally arranged with the output shaft 11, the third planet carrier 42 is connected with the third transmission shaft 41 through a spline, the third planet wheel 43 is rotatably connected to the third planet carrier 42 through a pin shaft 8, the third sun wheel 44 is coaxially connected to the second transmission shaft 31, and the third planet wheel 43 is arranged at the outer edge of the third sun wheel 44 and meshes with the third sun wheel 44; the second planet carrier 32 is connected with the second transmission shaft 31 through a spline, the second planet wheel 33 is rotatably connected to the second planet carrier 32 through a pin shaft 8, the second sun wheel 34 is coaxially connected to the first transmission shaft 21, and the second planet wheel 33 is arranged at the outer edge of the second sun wheel 34 and meshes with the second sun wheel 34; the first planet carrier 22 is connected with the first transmission shaft 21 through a spline, the first planet wheel 23 is rotatably connected to the first planet carrier 22 through a pin shaft 8, the first sun wheel 24 is coaxially connected to the input shaft 12, and the first planet wheel 23 is arranged at the outer edge of the first sun wheel 24 and meshes with the first sun wheel 24; the position opposite to the planet wheel in the box body 1 is provided with an inner ring tooth meshing with the planet wheel.

[0033] It should be noted that the end face of the planet wheel and the corresponding planet carrier are provided with a needle roller baffle 5, and a positioning pin is arranged on the planet carrier. The limiting pin cooperates with the needle roller baffle 5 to fix the relative position between the needle roller baffle 5 and the planet carrier. Since the needle roller baffle 5 is harder than the planet carrier, fixing the needle roller baffle 5 and the planet carrier can prevent friction between the needle roller baffle 5 and the planet carrier, which causes the end face of the planet carrier to wear and the planet wheel to axially move.

[0034] Preferably, one outer shell is correspondingly arranged outside each transmission group. The first transmission group 2 is correspondingly provided with a first outer shell 25, the second transmission group 3 is correspondingly provided with a second outer shell 35, and the third transmission group 4 is correspondingly provided with a third outer shell 45. The plurality of outer shells are connected together in sequence through connecting pieces to form the box body 1, so as to realize modular installation of the planetary reduction mechanism and facilitate maintenance.

[0035] The lubricating structure is arranged in the box body 1 for lubricating each part of the planetary reduction mechanism. The lubricating structure comprises a through hole 9 arranged in the planet wheel pin shaft 8, an oil groove 27 arranged on the abutting boss 26 at the end of the transmission shaft, an oil channel 6 arranged in the transmission shaft and the input shaft 12, and an oil passing hole 7 arranged on the planet wheel.

[0036] Specifically, the box 1 is provided with an oil inlet and an oil outlet, lubricating oil is injected into the box 1 through the oil inlet, and the lubricating oil does not fill the box 1. In this embodiment, the lubricating oil level reaches the position of the transmission shaft axis. The oil groove 27 is in communication with the space in the box 1, the abutting boss 26 on the first transmission shaft 21 abuts against the input shaft 12, the oil groove 27 on the first transmission shaft 21 is in communication with the oil channel 6 in the input shaft 12, the abutting boss 26 on the second transmission shaft 31 abuts against the first transmission shaft 21, the oil groove 27 on the second transmission shaft 31 is in communication with the oil channel 6 in the first transmission shaft 21, the abutting boss 26 on the third transmission shaft 41 abuts against the second transmission shaft 31, the oil groove 27 on the third transmission shaft 41 is in communication with the oil channel 6 in the second transmission shaft 31, and the inner diameter of the oil channel 6 is less than or equal to the outer diameter of the abutting boss 26. The lubricating oil in the box 1 enters the oil channel 6 in the transmission shaft and the input shaft 12 through the oil groove 27. The oil in the oil groove 27 lubricates the transmission shafts, reduces the jamming between adjacent transmission shafts and between the transmission shaft and the input shaft 12, and exchanges the oil in the transmission shaft with the oil in the box 1 when the transmission shaft rotates. The abutting surface abuts against the end surface of the transmission shaft. The oil channel 6 in the transmission shaft reduces the contact friction area. The internal oil storage, external oil immersion and reduced contact area together ensure that the friction loss at this position is reduced, the heat generation is reduced, and the efficiency of the gear box is improved.

[0037] The through hole 9 on the pin shaft 8 between the planet wheel and the planet carrier at least penetrates one end of the pin shaft 8, and the oil hole is formed in the side wall of the pin shaft 8. The oil passing hole 7 is formed on each planet wheel along the radial direction thereof, and a plurality of oil passing holes 7 are arranged along the circumferential direction of the planet wheel. The oil hole is arranged opposite to the oil passing hole 7. In use, when the planet wheel rotates to the lower side of the transmission shaft, the pin shaft 8 is not in the lubricating oil, and the lubricating oil is injected into the pin shaft 8. When the planet wheel rotates to the upper side, the planet wheel does not contact with the lubricating oil. Under the action of centrifugal force, the oil in the pin shaft 8 is thrown out to the sun gear and the inner ring teeth of the planet wheel through the oil hole 7 and the oil passing hole 7 when the planet wheel rotates. When the planet wheel rotates to the lower side again, the lubricating oil is pressed into the pin shaft 8 under the action of oil pressure to supplement the lubricating oil, forming a circulating live oil, which is beneficial to take away the heat and avoid accumulation to become dead oil and heat up.

[0038] The output shaft 11 is rotatably connected to the end of the box 1 away from the brake mechanism through the first bearing. The output shaft 11 is coaxially arranged with the input shaft 12. The box 1 is provided with a mounting hole through which the output shaft 11 penetrates. The first bearing is arranged between the inner circle of the mounting hole and the output shaft 11. The end of the box 1 is provided with a first gland. The output shaft 11 penetrates the first gland and is sealed between the first gland by a sealing ring. The output shaft 11 is rotatably connected to the first gland. The side of the mounting hole close to the inside of the box 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 opposite to the first bearing, thereby limiting the axial position of the first bearing.

[0039] The output end side of the box body 1 is provided with a mounting shell which is spaced apart from the box body 1, the mounting shell is mounted at the mounting position of the reduction gear box, the output shaft 11 is inserted into the mounting shell from the end away from the box body 1 and is rotationally connected with the mounting shell through the 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 which penetrates through the top cover, the mounting shell and is connected with the second gland, the second gland is provided with a second boss which 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 which is inserted into the mounting shell, and the second boss and the third boss are respectively abutted against the two sides of the second bearing opposite to each other, so as to limit the axial position of the second bearing. Preferably, in order to prevent the bolts from falling off due to long-term operation vibration and being stuck in the gear rack, a lock wire can be additionally provided for locking.

[0040] The output shaft 11 is coaxially connected with an output gear, the output gear is used for cooperating with a rack mounted on a lifting pile leg to control the 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 11 is supported by double bearings, the first bearing and the second bearing are respectively arranged on the two sides of the output gear, 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 costs 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 and improving the service life.

[0041] The implementation principle of the present application is:

[0042] Lubricating oil is injected into the box body 1 through the oil inlet, and the lubricating oil does not fill the box body 1. In this embodiment, the liquid level of the lubricating oil reaches the position of the transmission shaft axis. The lubricating oil in the box body 1 enters the internal oil channel 6 of the transmission shaft and the input shaft 12 through the oil groove 27. The oil in the oil groove 27 lubricates between the transmission shafts, so that the adjacent transmission shafts and the transmission shaft and the input shaft 12 are less likely to jam. When the transmission shaft rotates, the oil inside the transmission shaft is thrown out through the oil groove 27 and exchanges with the oil in the box body 1. The abutment surface abuts against the end surface of the transmission shaft. After the oil channel 6 is opened in the transmission shaft, the contact friction area is reduced, and the internal oil storage, external oil immersion and reduced contact area are realized through the oil channel 6 and the oil groove 27, which together ensure that the friction loss at this position is reduced, the heat generation is reduced, and the efficiency of the gear box is improved.

[0043] The abutting surfaces between the transmission shafts are changed into flat abutting surfaces, and oil grooves 27 are opened on the abutting surfaces, oil channels 6 are arranged inside the transmission shafts, the abutting protrusions cooperate with the end surfaces of the transmission shafts, the contact friction area between the transmission shafts is reduced, the cooperation of the oil grooves 27 and the oil channels 6 realizes internal oil storage and external oil immersion, thereby reducing the friction loss at the place, reducing the heat generation, improving the efficiency of the gear box, ensuring the precise operation, and accurately realizing the axial coaxial precision and the play control.

[0044] When the planet wheel rotates to below the transmission shaft, the pin shaft 8 planet wheel is in the lubricating oil, the pin shaft 8 is injected with lubricating oil, when the planet wheel rotates to above, the planet wheel is not in contact with the lubricating oil, and under the action of centrifugal force, the oil in the pin shaft 8 is thrown out to the planet wheel sun gear and the inner ring teeth through the oil hole 7 when rotating, when the planet wheel rotates to below again, the lubricating oil is pressed into the pin shaft 8 under the action of oil pressure to be supplemented, forming circulating live oil, which is beneficial to take away heat and avoid accumulation to become dead oil and temperature rise.

[0045] With the above ideal embodiments of the present application as the inspiration, through the above description, relevant staff 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 content in the specification, and must be determined by the scope of the claims.

Claims

1. A lubricating structure of a reduction gear box, the reduction gear box comprising a box body (1) provided with an input shaft (12) and an output shaft (11), and provided with an oil inlet and an oil outlet; a planetary reduction mechanism arranged in the box body (1) and arranged between the input shaft (12) and the output shaft (11), the planetary reduction mechanism comprising a first transmission group (2), a second transmission group (3), and an Nth transmission group in sequence along the direction from the input shaft (12) to the output shaft (11), each of the transmission groups comprising a transmission shaft and a transmission gear assembly arranged on the transmission shaft, a first transmission shaft (21) in the first transmission group (2), a second transmission shaft (31) in the second transmission group (3), and an Nth transmission shaft in the Nth transmission group being coaxially arranged between the input shaft (12) and the output shaft (11) in sequence; an end portion of the Nth transmission shaft is provided with an abutting surface, the Nth transmission shaft is coaxially abutted with the (N-1)th transmission shaft through the abutting surface, the first transmission shaft (21) is coaxially abutted with the input shaft (12) through the abutting surface, and the abutting surface is a plane; the lubricating structure comprises an oil channel (6) arranged in the transmission shaft and the input shaft (12), and an oil groove (27) arranged on the abutting surface, the oil groove (27) being communicated with an internal space of the box body (1) and an opposite oil channel (6). An abutting boss (26) for abutting with the (N-1)th transmission shaft and the input shaft (12) is arranged at the end portion of the Nth transmission shaft, and the abutting surface is arranged on the abutting boss (26). An outer diameter of the abutting boss (26) is greater than or equal to an inner diameter of the oil channel (6). characterized in that The box body (1) is provided with an inner gear, the transmission gear assembly in the Nth transmission group comprises an Nth planetary gear, an Nth sun gear, and an Nth planet carrier, the Nth planetary gear is rotatably arranged on the Nth planet carrier through a pin shaft (8) between a plurality of the transmission groups, the Nth planet carrier is connected with the Nth transmission shaft, and the Nth sun gear is coaxially connected on the (N-1)th transmission shaft, wherein a first sun gear (24) in the first transmission group (2) is coaxially connected on the input shaft (12), and the Nth planetary gear is meshed between the Nth sun gear and the inner gear. The lubricating structure further comprises a through hole (9) arranged in the pin shaft (8), the through hole (9) penetrating at least one end of the pin shaft (8); and an oil passing hole (7) arranged on the planetary gear, the oil passing hole (7) being communicated with the through hole (9) through an oil hole arranged on the pin shaft (8).

2. The lubricating structure of a reduction gear case according to claim 1, characterized by, An axial direction of the oil passing hole (7) is arranged along a radial direction of the planetary gear.

3. The lubricating arrangement of a reduction gear box according to claim 2, characterized in that, A plurality of the oil passing holes (7) are arranged along a circumferential direction of the planetary gear.

4. The lubricating structure of a reduction gear case according to claim 1, characterized by, The Nth planet carrier is connected with the Nth transmission shaft through a spline.

5. The lubricating arrangement of a reduction gear box according to claim 4, characterized in that, A needle roller baffle (5) is arranged between an end surface of the Nth planet carrier and the Nth planetary gear, and the needle roller baffle (5) is fixedly connected with the Nth planet carrier. ​ ​ 6. The lubricating arrangement of a reduction gear box according to claim 5, characterized in that ​ 7. The lubricating arrangement of a reduction gear box according to claim 6, characterized in that, ​ 8. The lubricating structure of a reduction gear case according to claim 4, characterized by, ​ 9. The lubricating structure of a reduction gear case according to claim 4, characterized by, ​

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