CN213479118U - Device for improving bearing capacity of small-tooth-difference transmission output mechanism - Google Patents
Device for improving bearing capacity of small-tooth-difference transmission output mechanism Download PDFInfo
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- CN213479118U CN213479118U CN202022335452.9U CN202022335452U CN213479118U CN 213479118 U CN213479118 U CN 213479118U CN 202022335452 U CN202022335452 U CN 202022335452U CN 213479118 U CN213479118 U CN 213479118U
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- output flange
- middle disc
- shaft sleeve
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Abstract
The utility model discloses a device for improving the bearing capacity of a small tooth difference transmission output mechanism, which comprises a left output flange (1) and a right output flange (2); an intermediate disc (3) is arranged between the left output flange (1) and the right output flange (2); a left planetary gear (4) is arranged between the left output flange (1) and the middle disc (3); a right planetary gear (5) is arranged between the middle disc (3) and the right output flange (2); the left planetary gear (4) and the right planetary gear (5) are connected with the left output flange (1), the middle disc (3) and the right output flange (2) through pin shafts. Adopt the utility model discloses can effectively reduce transmission's volume under the same bearing capacity condition to and can effectively improve the bearing capacity who improves the poor transmission output mechanism of few tooth under the condition of same volume.
Description
Technical Field
The utility model relates to an improve poor transmission output mechanism bearing capacity's of few tooth device belongs to mechanical transmission technical field.
Background
The simple beam type small-tooth-difference transmission output mechanism has the characteristics of compact structure, small volume, light weight, large transmission ratio range, high efficiency, large bearing capacity and the like. The pin bush arranged on the pin shaft of the existing simply supported beam type small tooth difference transmission output mechanism is a long pin bush which is simultaneously contacted with the pin holes on the two planetary gears, and the pin shaft and the pin bush bear additional constraint stress due to the influence of part manufacturing and assembling errors in the existing structure; when the device works, the acting force F of the two planetary gears on the pin sleeve is opposite in direction, so that the pin sleeve bears bending load; in addition, the rotating speeds of the contact points of the pin sleeve and the two planetary gears are different, so that sliding friction exists between the pin sleeve and pin hole contact surfaces of the planetary gears. The defects cause friction heating of the speed reducer and early abrasion of a contact surface, so that the transmission precision is reduced. Therefore, the prior art still has the defects and needs to be further improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an improve poor transmission output mechanism bearing capacity's of few tooth device to under the condition that keeps bearing capacity not to descend, shorten fulcrum span E through the mode that increases auxiliary stay, and then reduce the round pin axle diameter, reduce the poor transmission output device's of few tooth volume, thereby solve the not enough of prior art existence.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model relates to a device for improving the bearing capacity of a small tooth difference transmission output mechanism, which comprises a left output flange and a right output flange; an intermediate disc is arranged between the left output flange and the right output flange; a left planetary gear is arranged between the left output flange and the middle disc; a right planetary gear is arranged between the middle disc and the right output flange; the left planetary gear and the right planetary gear are connected with the left output flange, the middle disc and the right output flange through pin shafts.
In the device, the intermediate disc is of a circular ring structure and is provided with a smooth pin shaft hole and a step pin shaft hole which are uniformly distributed along the circumference; the smooth pin shaft holes and the step pin shaft holes are uniformly arranged in a crossed mode at intervals.
In the device, a smooth pin shaft penetrating through the smooth pin shaft hole is arranged in the smooth pin shaft hole; a step pin shaft penetrating through the step pin shaft hole is arranged in the step pin shaft hole; and the two ends of the optical pin shaft and the two ends of the step pin shaft are respectively provided with an external thread which is fixedly connected with the left output flange or the right output flange, and a locking nut is screwed on the external thread.
In the device, the optical pin shaft is sleeved with a fixed shaft sleeve; a movable shaft sleeve is sleeved outside the fixed shaft sleeve; a movable shaft sleeve is sleeved on the step pin shaft; the fixed shaft sleeve and the movable shaft sleeve are divided into two sections; one section is positioned at the left side of the middle disc, and the other section is positioned at the right side of the middle disc; the left output flange, the right output flange and the intermediate plate are fixed into a rigid body by the fixed shaft sleeve and the optical pin shaft; the movable shaft sleeve is in clearance fit with the fixed shaft sleeve.
Due to the adoption of the technical scheme, compared with the prior art, the outer diameter of the fixed shaft sleeve in the utility model is the same as that of the step pin shaft, the fixed shaft sleeve and the step pin shaft transmit output load together, and the number of the pin shafts with small tooth difference transmission is not reduced; under the action of the relatively fixed middle disc, the step pin shaft and the optical pin shaft form an auxiliary fulcrum in the middle, so that the supporting structure of the left planetary gear and the right planetary gear is improved, the supporting span E is reduced, and the bending stress of the step pin shaft and the optical pin shaft is reduced; the movable shaft sleeve is contacted with the pin hole of the single planetary gear, so that bending and relative sliding caused by simultaneous contact of the two planetary gears are avoided, and the stress condition of the pin shaft during working is improved. The utility model discloses can effectively reduce transmission's volume under the condition of same bearing capacity to and can effectively improve the bearing capacity who improves the poor transmission output mechanism of few tooth under the condition of same volume.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an isometric view of the appearance of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a cross-sectional view B-B of FIG. 1;
FIG. 5 is a schematic structural view of the intermediate tray of the present invention;
fig. 6 is a schematic connection diagram of the optical hinge pin of the present invention;
FIG. 7 is a schematic connection diagram of the step pin of the present invention;
FIG. 8 is a schematic view of a conventional low tooth differential transmission output.
The labels in the figures are: 1-left output flange, 2-right output flange, 3-middle disk, 4-left planetary gear, 5-right planetary gear, 6-smooth pin shaft hole, 7-step pin shaft hole, 8-smooth pin shaft, 9-step pin shaft, 10-locking nut, 11-fixed shaft sleeve and 12-movable shaft sleeve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The utility model discloses a method according to the poor transmission output mechanism bearing capacity of few tooth that improves constitutes, as shown in fig. 1 to 7, this method utilizes round pin axle bending stress and round pin axle diameter and fulcrum span's relation, adopts the mode that increases the auxiliary stay to shorten the fulcrum span to realize improving the poor transmission output mechanism bearing capacity's of few tooth purpose. The auxiliary support adopts a middle disc, and the middle disc is positioned between the left output flange and the right output flange. The left output flange, the middle disc and the right output flange are connected through a pin shaft; the pin shaft is provided with a fixed shaft sleeve and a movable shaft sleeve, the fixed shaft sleeve and the movable shaft sleeve are divided into a left section and a right section, and the left section of the shaft sleeve is only in sliding connection with a pin hole of a left planetary gear between the left output flange and the middle disc; the right section of shaft sleeve is only in sliding connection with a pin hole of a right planetary gear which is positioned between the middle disc and the right output flange; thereby eliminating the bending load of the shaft sleeve caused by the reverse acting force of the left and right groups of planet gears on the shaft sleeve.
The device for improving the bearing capacity of the small tooth difference transmission output mechanism is formed according to the method, and comprises a left output flange 1 and a right output flange 2 as shown in figures 1-7; the method is characterized in that: an intermediate disc 3 is arranged between the left output flange 1 and the right output flange 2; a left planetary gear 4 is arranged between the left output flange 1 and the intermediate disk 3; a right planetary gear 5 is arranged between the middle disc 3 and the right output flange 2; the left planetary gear 4 and the right planetary gear 5 are connected with the left output flange 1, the middle disc 3 and the right output flange 2 through pin shafts. The middle disc 3 is of a circular ring structure, and the middle disc 3 is provided with smooth pin shaft holes 6 and step pin shaft holes 7 which are uniformly distributed along the circumference; the smooth pin shaft holes 6 and the step pin shaft holes 7 are uniformly arranged in a crossed mode at intervals. A smooth pin shaft 8 penetrating through the smooth pin shaft hole 6 is arranged in the smooth pin shaft hole 6; a step pin shaft 9 penetrating through the step pin shaft hole 7 is arranged in the step pin shaft hole 7; and external threads which are fixedly connected with the left output flange 1 or the right output flange 2 are respectively arranged at two ends of the smooth pin shaft 8 and the step pin shaft 9, and a locking nut 10 is screwed on the external threads. The fixed shaft sleeve 11 is sleeved on the optical pin shaft 8; a movable shaft sleeve 12 is sleeved outside the fixed shaft sleeve 11; a movable shaft sleeve 12 is sleeved on the step pin shaft 9; the fixed shaft sleeve 11 and the movable shaft sleeve 12 are divided into two sections; one section is positioned at the left side of the middle disc 3, and the other section is positioned at the right side of the middle disc 3; the left output flange 1, the right output flange 2 and the intermediate plate 3 are fixed into a rigid body by the fixed shaft sleeve 11 and the optical pin shaft 8; the movable shaft sleeve 12 is in clearance fit with the fixed shaft sleeve 11.
The working principle of the present invention is further explained as follows:
the bending stress sigma F of the pin shaft is calculated according to the formula:
the unit is: MPa of
In the above formula:
km is an influence coefficient Km = 1.35-1.5 of manufacturing and mounting errors on pin shaft loads, and a large value is taken when the precision is high, and a small value is taken otherwise;
qmax-is the acting force of the planetary gear to the pin shaft, and the unit is N;
d is the diameter of the pin shaft and is in mm;
e-is the fulcrum span, in mm;
a is the distance between the upper fulcrum of the output flange and the end face of the planetary gear, and the unit is mm;
b is the tooth width of the planet gear in mm.
Wherein: qmax =4 × T2 × 0.6/(Rw × Z),
t2-nominal torque delivered by the output shaft in Nm;
rw is the radius of the pin shaft distribution circle in mm;
z is the number of the pin shafts;
from the above formula for calculating the bending stress σ F of the pin shaft, it can be known that, under the condition of unchanged bearing capacity, i.e., unchanged nominal torque transmitted by the output shaft, when the number of the pin shafts and the size of the distributed circle radius are fixed, the bending stress σ F of the pin shaft is inversely proportional to the 3 rd power of the diameter d of the pin shaft and positively correlated to the fulcrum span E.
Therefore the utility model discloses an increase the mode of auxiliary stay and shorten fulcrum span E to the purpose that realizes improving the poor transmission output mechanism bearing capacity of few tooth is not only theoretically feasible, also is feasible through experimental proof moreover.
Examples
Compared with the prior art, the small tooth difference transmission output device is improved by the embodiment shown in fig. 8, the intermediate disc 3 is added, and the fixed shaft sleeve 11 and the movable shaft sleeve 12 are divided into a left section and a right section which are respectively arranged at two sides of the intermediate disc and are respectively connected with the left planetary gear 4 and the right planetary gear 5 in a sliding way. Six equal-diameter holes D which are uniformly distributed along the circumference and used for fixing a smooth pin shaft 8 and a step pin shaft 9 are respectively arranged on the left output flange 1 and the right output flange 2. As shown in fig. 3, the intermediate disc 3 is uniformly provided with three optical pin holes 6 and three step pin holes 7 along the circumference; the smooth pin shaft holes 6 and the step pin shaft holes 7 are uniformly arranged in a crossed mode at intervals, the smooth pin shaft holes 6 are matched with the smooth pin shafts 8, the step pin shaft holes 7 are matched with the step pin shafts 9, the total number of the pin shaft holes is six in the embodiment, in actual application, the total number of the pin shaft holes can be determined according to specific conditions of use, namely the total number of the pin shaft holes can be less than six or can be more than six. The middle disc 3 is positioned between the left output flange 1 and the right output flange 2, the fixed shaft sleeves 11 are respectively arranged at two sides of the middle disc 3, the optical pin shaft 8 sequentially penetrates through the left output flange 1, the fixed shaft sleeves 11, the optical pin shaft hole 6 on the middle disc 3, the fixed shaft sleeves 11 and the right output flange 2, and two ends of the optical pin shaft 8 are locked through the locking nuts 10. The middle disc 3, the left output flange 1 and the right output flange 2 are fixed into a rigid whole under the action of the optical pin shaft 8 and the fixed shaft sleeve 11. The step pin shaft 9 and the step pin shaft hole 7 of the intermediate disc 3 are coaxially arranged, and external threads at two ends of the step pin shaft 9 are matched with the holes D on the left output flange 1 and the right output flange 2 and then locked by the locking nut 10. The fixed shaft sleeve 11 and the movable shaft sleeve 12 are both positioned at two sides of the middle disc 3, and the inner hole of the movable shaft sleeve 12 is respectively matched with the outer circles of the step pin shaft 9 and the fixed shaft sleeve 11. The axial length of the movable sleeve 12 is smaller than that of the fixed sleeve 11, so that the movable sleeve 12 can freely rotate around the axis thereof after being assembled. The diameter of the outer circle of the movable shaft sleeve 12 is determined according to the eccentricity of the eccentric shaft and the pin hole diameter of the planetary gear. Under the constraint action of the middle disc 3, the step pin shaft 9 and the optical pin shaft 8 form an auxiliary fulcrum between the left output flange 1 and the right output flange 2, so that the supporting structure between the left output flange 1 and the right output flange 2 is improved, the supporting span E is shortened, and the bending stress of the step pin shaft 9 and the optical pin shaft 8 can be reduced.
The outer diameter of the fixed shaft sleeve is the same as that of the step pin shaft, the fixed shaft sleeve and the step pin shaft transmit output load together, and the number of the pin shafts for small tooth difference transmission is not reduced; under the action of the relatively fixed middle disc, the step pin shaft and the optical pin shaft form an auxiliary fulcrum in the middle, so that the supporting structure of the left planetary gear and the right planetary gear is improved, the supporting span E is reduced, and the bending stress of the step pin shaft and the optical pin shaft is reduced; the movable shaft sleeve is contacted with the pin hole of the single planetary gear, so that bending and relative sliding caused by simultaneous contact of the two planetary gears are avoided, and the stress condition of the pin shaft during working is improved. The volume of the transmission can be reduced under the condition of the same bearing capacity.
Claims (4)
1. A device for improving the bearing capacity of a small-tooth-difference transmission output mechanism comprises a left output flange (1) and a right output flange (2); the method is characterized in that: an intermediate disc (3) is arranged between the left output flange (1) and the right output flange (2); a left planetary gear (4) is arranged between the left output flange (1) and the middle disc (3); a right planetary gear (5) is arranged between the middle disc (3) and the right output flange (2); the left planetary gear (4) and the right planetary gear (5) are connected with the left output flange (1), the middle disc (3) and the right output flange (2) through pin shafts.
2. The device for improving the bearing capacity of the small tooth difference transmission output mechanism according to claim 1, wherein: the middle disc (3) is of a circular structure, and the middle disc (3) is provided with smooth pin shaft holes (6) and step pin shaft holes (7) which are uniformly distributed along the circumference; the smooth pin shaft holes (6) and the step pin shaft holes (7) are uniformly arranged in a crossed mode at intervals.
3. The device for improving the bearing capacity of the small tooth difference transmission output mechanism according to claim 2, wherein: a smooth pin shaft (8) penetrating through the smooth pin shaft hole (6) is arranged in the smooth pin shaft hole (6); a step pin shaft (9) penetrating through the step pin shaft hole (7) is arranged in the step pin shaft hole (7); and the two ends of the smooth pin shaft (8) and the step pin shaft (9) are respectively provided with an external thread which is fixedly connected with the left output flange (1) or the right output flange (2), and a locking nut (10) is screwed on the external thread.
4. The apparatus of claim 3 for improving the carrying capacity of a small tooth difference transmission output mechanism, wherein: a fixed shaft sleeve (11) is sleeved on the optical pin shaft (8); a movable shaft sleeve (12) is sleeved outside the fixed shaft sleeve (11); a movable shaft sleeve (12) is sleeved on the step pin shaft (9); the fixed shaft sleeve (11) and the movable shaft sleeve (12) are divided into two sections; one section is positioned at the left side of the middle disc (3), and the other section is positioned at the right side of the middle disc (3); the left output flange (1), the right output flange (2) and the middle disc (3) are fixed into a rigid body by the fixed shaft sleeve (11) and the optical pin shaft (8); the movable shaft sleeve (12) is in clearance fit with the fixed shaft sleeve (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022335452.9U CN213479118U (en) | 2020-10-20 | 2020-10-20 | Device for improving bearing capacity of small-tooth-difference transmission output mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022335452.9U CN213479118U (en) | 2020-10-20 | 2020-10-20 | Device for improving bearing capacity of small-tooth-difference transmission output mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213479118U true CN213479118U (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022335452.9U Active CN213479118U (en) | 2020-10-20 | 2020-10-20 | Device for improving bearing capacity of small-tooth-difference transmission output mechanism |
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| CN (1) | CN213479118U (en) |
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