CN112728012A - Planetary gear train integrated structure - Google Patents

Abstract

The invention provides a planetary gear train integrated structure, which comprises a planet carrier radials, a planet pin shaft, a planet wheel, a rolling body, a retainer and a limit ring, wherein the planet carrier radials are arranged on the planet pin shaft; four U-shaped grooves are arranged in the planet wheel, and rolling bodies are arranged at the bottom of the U-shaped grooves in the circumferential direction; a step is arranged in the middle of the planetary pin shaft, and the step and a limiting ring on the right side are used together for axially positioning the planetary wheel and the rolling body; the right step of the planet pin shaft is matched with the end face of the rolling body, the left step of the planet pin shaft compresses a baffle plate, the left step and the right step of the planet pin shaft jointly position the planet wheel and the rolling body, and the planet pin shaft is arranged on the radial plate of the planet carrier in an interference connection manner; a limiting ring is arranged on the right side of the planetary pin shaft, the limiting ring is matched with the planetary pin shaft, and a circumferential bolt is arranged on the end face of the right side of the limiting ring to fix the limiting ring on the planetary pin shaft; the retainer is arranged between the planet wheel and the rolling body. The invention realizes the integrated design of the planet wheel and the planet pin shaft, and has compact structure, light weight and low cost.

Description

Planetary gear train integrated structure

Technical Field

The invention belongs to the field of mechanical transmission, and particularly relates to an integrated structure of a planetary gear train.

Background

In order to improve the power of the gearbox, a planetary transmission structure is generally adopted to improve the bearing capacity of the gearbox, the more the number of the planet wheels is, the more the gear pairs participating in meshing are, the stronger the integral bearing capacity of the gearbox is, and the transmission field generally adopts the number of the planet wheels to improve the integral capacity of the gearbox.

As shown in fig. 1, a connecting plate for connecting left and right radial plates of a conventional squirrel-cage planet carrier needs to occupy a large space in the circumferential direction of arrangement of planet wheels, and also influences the arrangement of the planet wheels, and in addition, the installation and the disassembly of the planet wheels are very difficult, and the installation needs to be realized by means of freezing and drying sleeves; the disassembly is carried out by large hydraulic equipment, and particularly for large planetary transmission gear boxes, the disassembly difficulty is multiplied.

The existing planetary gear train usually adopts a bearing with an outer ring, however, after the number of the planetary gears is increased, the diameter of the planetary gears is reduced under the condition that the size of a gear ring is fixed, the planetary gear bearing needs to simultaneously bear loads engaged with a sun gear and the gear ring, the planetary gear bearing is also a bottleneck, the size of the planetary gear bearing cannot be reduced, the number of the planetary gears is increased, the wall thickness of the planetary gears is thinned after the diameter of the gears is reduced, the cracking risk of the planetary gear is easy to occur, and the outer ring and the inner ring of the planetary gear bearing are easy to slip; or directly adopt the rolling element bearing to pack between planet wheel hole and planet round pin axle, this kind of mounting means rolls and lacks fine guide, and the rolling element appears inclining easily at the operation process, and in case the rolling element inclines, the operation mode of rolling element changes very easily, becomes sliding operation by the rolling operation, and the coefficient of sliding friction is high, and running resistance can increase by a wide margin, can arouse rolling element or raceway to peel off, causes planet wheel bearing card extremely very easily, and then causes disconnected tooth, the whole scheduling problem that loses efficacy of gear box.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an integrated structure of a planetary gear train. The planetary gear box realizes the integrated design of the planetary gear, the planetary gear bearing and the planetary gear pin shaft, can realize the maximization of the number of the arranged planetary gears, has high bearing capacity under the condition of a certain diameter of the planetary gears, can help the planetary gear box to realize higher power density, and has the characteristics of compact structure, light weight, low cost, independent and detachable planetary gears, convenient maintenance and replacement and low maintenance cost.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the planetary gear train integrated structure comprises a planet carrier radials, a planet pin shaft, a planet gear, a rolling body, a retainer and a limit ring; four U-shaped grooves are arranged in the planet wheel, and rolling bodies are arranged at the bottom of each U-shaped groove in the circumferential direction; a step is arranged in the middle of the planetary pin shaft, and the step and a limiting ring on the right side are used together for axially positioning the planetary wheel and the rolling body; the right step of the planet pin shaft is matched with the end face of the rolling body, the left step of the planet pin shaft compresses a baffle plate, the left step and the right step of the planet pin shaft jointly position the planet wheel and the rolling body, and the planet pin shaft is arranged on the radial plate of the planet carrier in an interference connection mode; a limiting ring is arranged on the right side of the planetary pin shaft, the limiting ring is matched with the planetary pin shaft, and a circumferential bolt is arranged on the end face of the right side of the limiting ring to fix the limiting ring on the planetary pin shaft; the retainer is arranged between the planet wheel and the rolling body.

Furthermore, the inside U type groove lateral wall of planet wheel can carry out the additional strengthening to planet wheel itself, avoids bearing the alternating load stress of gear and causes the planet wheel fracture, and then through the clearance between control rolling element and U type groove, when the slope of certain angle appears in the rolling element, by the lateral wall restraint, can not further incline, at the rotatory in-process of planet wheel, can drive the rolling element to reseing to the direction parallel with round pin axle center, avoids the rolling element card to die.

Furthermore, the left side of planet round pin axle is provided with the flange, distributes the bolt hole on the flange, fixes planet round pin axle on the radials, and axial drive and circumference rotation appear in reducible planet round pin axle actual loading in-process.

Furthermore, the retainer is provided with a plurality of arc windows in the axial direction, the rolling bodies are separated, mutual friction between the rolling bodies is avoided, the service life of rolling is influenced, the rolling bodies can be guided synchronously by the inner holes of the synchronous diameter and the small steps, and slipping in the running process of the rolling bodies is avoided.

Furthermore, a plurality of planet wheel pin shaft holes are arranged on the planet carrier radials to connect the planet wheel pin shafts with the planet carrier radials, and the end faces of the planet wheel pin shafts are connected with the radials through flanges/bolts.

Furthermore, a back chipping fillet is arranged at the bottom of the planetary wheel U-shaped groove.

Has the advantages that: according to the planetary gear train integrated structure, the planetary gear and the planetary pin shaft are integrally designed, so that the size of the internal space of the planetary gear, including the local radial space and the axial space, is greatly reduced under the condition that the same bearing capacity of the bearing is ensured, the internal space of the planetary gear used by the planetary gear bearing is reduced, the reinforcing effect on the planetary gear body is realized, and the problem that the common planetary gear is difficult to mount and dismount is solved.

Drawings

FIG. 1 is a schematic diagram of a prior art planet carrier structure;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a schematic view of the construction of the planetary wheel of the present invention;

FIG. 5 is a schematic view of the structure of the planetary pin of the present invention;

fig. 6 is a schematic structural view of the cage of the present invention.

In the figure, 1-planet carrier radials, 2-planet pin shafts, 3-planet wheels, 4-rolling bodies, 5-cages and 6-spacing rings.

Detailed Description

The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.

The planetary gear train integrated structure, as shown in fig. 2 to 5, includes a planet carrier web 1, a planet pin 2, a planet wheel 3, a rolling element 4, a retainer 5 and a limit ring 6; four U-shaped grooves are arranged in the planet wheel 3, and rolling bodies 4 are arranged at the bottom of the U-shaped grooves in the circumferential direction; a step is arranged in the middle of the planetary pin shaft 2, and the step and the limiting ring 6 on the right side are used together for axially positioning the planetary wheel and the rolling body; the right step of the planet pin shaft 2 is matched with the end face of the rolling element 4, the left step of the planet pin shaft 2 compresses a baffle plate, the left step and the right step of the planet pin shaft 2 jointly position the planet wheel 3 and the rolling element 4, and the planet pin shaft 2 is arranged on the radial plate of the planet carrier in an interference connection mode; a limiting ring 6 is arranged on the right side of the planetary pin shaft 2, the limiting ring 6 is matched with the planetary pin shaft 2, and a peripheral bolt is arranged on the end face of the right side of the limiting ring 6 to fix the limiting ring 6 on the planetary pin shaft; a cage 5 is provided between the planet wheels 3 and the rolling bodies 4.

The side wall of a U-shaped groove in the planet wheel 3 can additionally reinforce the planet wheel 3 to prevent the planet wheel from cracking due to the alternating load stress of a gear, and further, by controlling the gap between the rolling body 4 and the U-shaped groove, when the rolling body 4 inclines at a certain angle, the rolling body 4 is restrained by the side wall and cannot incline further, and in the rotation process of the planet wheel, the rolling body 4 can be driven to reset in the direction parallel to the axis of the pin shaft to prevent the rolling body 4 from being blocked, and a back chipping fillet is arranged at the bottom of the U-shaped groove of the planet wheel; a flange is arranged on the left side of the planet pin shaft 2, bolt holes are distributed on the flange, the planet pin 3 shaft is fixed on the radial plate, axial transmission and circumferential rotation in the actual loading process of the planet pin shaft can be reduced, a plurality of planet pin shaft holes are distributed on the radial plate 1 of the planet carrier, the planet pin shaft 2 is connected with the radial plate 1 of the planet carrier, and the end face of the planet pin shaft 2 is connected with the radial plate through the flange/the bolts; the retainer 5 is axially provided with a plurality of arc windows to separate the rolling bodies 4, so that the mutual friction among the rolling bodies is avoided, the rolling service life is influenced, the inner holes of the synchronous diameter and the small steps can guide the rolling bodies synchronously, and the rolling bodies are prevented from slipping in the running process.

Claims (7)

1. The planetary gear train integrated structure is characterized in that: the device comprises a planet pin shaft, a planet wheel and a rolling body; an outer concave U-shaped groove is formed in the planet wheel, an inner concave U-shaped groove is formed in the outer portion of the planet pin shaft, and rolling bodies are arranged between the inner concave U-shaped groove and the outer concave U-shaped groove in the circumferential direction; the inner and outer concave U-shaped grooves have the functions of guiding and axially positioning the rolling bodies; the form in which can be arranged: the planetary gear axial positioning device is characterized in that a plurality of or one outer concave U-shaped groove and one inner U-shaped groove are formed, the outer concave U-shaped groove mainly plays a role in guiding a rolling body, and the inner U-shaped groove plays a role in axial positioning of a planetary gear; or a plurality of or one inner concave U-shaped groove and one outer concave U-shaped groove can be used, the inner concave U-shaped groove mainly guides the rolling bodies, and the outer concave U-shaped groove has the function of axially positioning the planet wheel.

2. The planetary gear train integrated structure as in claim 1, further comprising a planet carrier web, a planet pin, a planet wheel, a rolling element, a cage and a retainer ring; four U-shaped grooves are arranged in the planet wheel, and rolling bodies are arranged at the bottom of each U-shaped groove in the circumferential direction; a step is arranged in the middle of the planetary pin shaft, and the step and a limiting ring on the right side are used together for axially positioning the planetary wheel and the rolling body; the right step of the planet pin shaft is matched with the end face of the rolling body, the left step of the planet pin shaft compresses a baffle plate, the left step and the right step of the planet pin shaft jointly position the planet wheel and the rolling body, and the planet pin shaft is arranged on the radial plate of the planet carrier in an interference connection mode; a limiting ring is arranged on the right side of the planetary pin shaft, the limiting ring is matched with the planetary pin shaft, and a circumferential bolt is arranged on the end face of the right side of the limiting ring to fix the limiting ring on the planetary pin shaft; the retainer is arranged between the planet wheel and the rolling body.

3. The planetary gear train integrated structure as in claim 1, wherein the side wall of the U-shaped groove inside the planetary gear additionally reinforces the planetary gear itself, so that the planetary gear is prevented from cracking due to the alternating load stress of the gear, and further, by controlling the gap between the rolling element and the U-shaped groove, when the rolling element is inclined at a certain angle, the rolling element is restrained by the side wall and cannot be further inclined, and in the rotation process of the planetary gear, the rolling element can be driven to reset in the direction parallel to the axis of the pin shaft, so that the rolling element is prevented from being locked.

4. The integrated planetary gear train structure as claimed in claim 1, wherein the left side of the planetary pin is provided with a flange, and bolt holes are distributed on the flange to fix the planetary pin on the spoke plate, so that axial movement and circumferential rotation of the planetary pin during actual loading can be reduced.

5. The integrated planetary gear train structure as in claim 1, wherein the retainer is axially designed with a plurality of arc windows to separate the rolling elements, so as to avoid mutual friction between the rolling elements and influence the service life of the rolling elements, and the synchronous diameter and the inner hole of the small step can guide the rolling elements synchronously, so as to avoid the rolling elements from slipping in the running process.

6. A planetary gear train integrated structure as claimed in claim 1, wherein the planet carrier web is provided with a plurality of planet pin holes for connecting the planet pins with the planet carrier web, and the end faces of the planet pins are connected with the web through flanges/bolts.

7. The planetary gear train integrated structure as claimed in claim 1, wherein the bottom of the planetary gear and planetary gear U-shaped groove is provided with a back chipping fillet.

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