CN217152847U - Two-stage planetary reduction mechanism and wheel - Google Patents

Abstract

The utility model relates to a two-stage planet reduction gears, include: a central drive assembly and a two-stage planetary drive assembly. The central transmission assembly comprises: the main shaft, and the primary sun gear and the secondary sun gear are respectively positioned on the main shaft. The two-stage planetary transmission assembly comprises: the planet carrier that cup joints on the main shaft, wear to establish on the planet carrier and be on a parallel with the planet axle that the main shaft set up, be located the one end of planet axle and mesh the one-level planet wheel of one-level sun gear, mesh the one-level ring gear of one-level planet wheel, be located the other end of planet axle and mesh the second grade planet wheel of second grade sun gear and mesh the second grade ring gear of second grade planet wheel. The primary gear ring and the secondary gear ring are arranged in a surrounding mode by taking the main shaft as the center. The utility model discloses still provide a wheel that contains this two-stage planet reduction gears. The utility model has the advantages that: the coaxial two-stage planetary structure design with different speeds is adopted, and the purposes of prolonging the service life, reducing the equipment cost and the like are achieved.

Description

Two-stage planetary reduction mechanism and wheel

Technical Field

The utility model relates to a speed change mechanism technical field especially relates to a two-stage planetary reduction mechanism to and a wheel that contains this two-stage planetary reduction mechanism.

Background

The reduction mechanism is a transmission device that can achieve conversion of rotation speed and torque, usually expressed as conversion of high rotation speed into low rotation speed and conversion of low torque into high torque, and is commonly used for transmission between a prime mover and a working machine. Among them, a reduction mechanism using a two-stage planetary gear is a relatively common type.

In the conventional two-stage planetary reduction mechanism, there are disadvantages that: the rotating shaft of the first-stage planet wheel and the rotating shaft of the second-stage planet wheel are arranged in a staggered mode (non-coaxial arrangement), and the rotating shafts of the two-stage planet wheels are connected through the planet carrier. Due to the design, a planetary system formed by the primary planet wheel and the secondary planet wheel has the problem of unbalanced stress on two sides, and a rotating shaft of the planet wheel or even a planet carrier is easy to damage. In addition, each planet wheel needs to be provided with a rotating shaft independently, and the using amount of the rotating shaft is large. The defects result in the problems of short service life, high equipment cost and the like of the traditional two-stage planetary speed reducing mechanism.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a two-stage planet reduction gears adopts coaxial not fast two-stage planet structural design, reaches purposes such as increase of service life weak point and reduction equipment cost.

A two-stage planetary reduction mechanism comprising:

a central drive assembly; the central transmission assembly comprises: the main shaft, the primary sun gear positioned on the main shaft and the secondary sun gear positioned on the main shaft; the first-stage sun gear and the second-stage sun gear are coaxial and rotate at the same angular speed; the pitch circle radiuses of the first-stage sun wheel and the second-stage sun wheel are different; and

a two-stage planetary drive assembly connected to the central drive assembly; the two-stage planetary transmission assembly comprises: the planetary gear set comprises a planetary carrier sleeved on a main shaft, a planetary shaft arranged on the planetary carrier in a penetrating way and parallel to the main shaft, a primary planet gear positioned at one end of the planetary shaft and meshed with a primary sun gear, a primary ring gear meshed with the primary planet gear, a secondary planet gear positioned at the other end of the planetary shaft and meshed with a secondary sun gear, and a secondary ring gear meshed with the secondary planet gear; the primary gear ring and the secondary gear ring are arranged in a surrounding mode by taking the main shaft as a center; the primary planet wheel and the secondary planet wheel are coaxial and rotate at the same angular speed; the pitch circle radiuses of the primary planet wheels and the secondary planet wheels are different.

According to the two-stage planetary reduction mechanism, the first-stage planetary gear and the second-stage planetary gear are arranged coaxially and at the same speed, and different rotating speed outputs are realized by arranging different pitch circle radiuses. Because of the adoption of coaxial arrangement, the two sides of a planetary system formed by the primary planet wheel and the secondary planet wheel are stressed in a balanced manner, the planet shaft and the planet carrier are not easy to damage, and rotating shafts do not need to be arranged aiming at the planet wheels at all levels independently, so that the using amount of the rotating shafts is reduced. Through the design, the coaxial two-stage planetary structure design with different speeds is adopted, and the purposes of prolonging the service life, reducing the equipment cost and the like are achieved.

In one embodiment, the two-stage planetary reduction mechanism further includes: a protective cover wrapping the central transmission component and the two-stage planetary transmission component; the safety cover includes: the first-stage cover body and the second-stage cover body are sleeved with each other; the primary cover body and the secondary cover body are arranged along the main shaft; the primary gear ring is positioned on the inner side of the primary cover body; the second-level gear ring is positioned on the inner side of the second-level cover body. The primary cover body and the secondary cover body not only can protect devices wrapped inside, but also can be used as transmission parts between the primary toothed ring and the secondary toothed ring and external devices.

In one embodiment, the primary cover body is connected with the secondary cover body through a first bearing. The first bearing can make one-level cover body and the second grade cover body realize stable relative pivoted and be connected, improves the stability and the flexibility of equipment operation.

In one embodiment, the main shaft is connected with the primary cover body through a second bearing; the main shaft is connected with the secondary cover body through a third bearing. The second bearing and the third bearing can enable the main shaft to be connected with the first-stage cover body and the second-stage cover body in a stable and relatively rotatable mode respectively, and stability and flexibility of operation of the equipment are improved.

In one embodiment, the planet carrier is connected with the primary cover body through a fourth bearing. The fourth bearing can be so that realize stable relative pivoted between planet carrier and the one-level cover body and be connected, improve equipment operation's stability and flexibility.

In one embodiment, the primary housing defines a receiving cavity for receiving the actuator. The accommodating cavity can be used for accommodating the driver and plays a role in accommodating and protecting the driver.

In one embodiment, the end of the primary housing facing away from the secondary housing is provided with a removable closure. The removable cover facilitates installation and removal of the driver into and from the primary housing.

In one embodiment, a planetary shaft, a primary planetary gear and a secondary planetary gear form a two-stage planetary transmission unit; the two-stage planetary transmission assembly is provided with a plurality of two-stage planetary transmission units; the planet shafts of the two-stage planetary transmission units are symmetrically distributed by taking the main shaft as the center. The plurality of two-stage planetary transmission assemblies which are symmetrically distributed by taking the main shaft as the center can reduce the load of a single planetary transmission assembly, and are beneficial to improving the running stability of equipment and prolonging the service life.

In one embodiment, the two-stage planetary transmission assembly is provided with three two-stage planetary transmission units; the connecting lines of the central points of the planet shafts of the three two-stage planet transmission units are in an equilateral triangle. Three planetary transmission units distributed in an equilateral triangle are high in stability, and the use amount of planetary shafts is small.

Simultaneously, this scheme still provides a wheel that contains this two-stage planet reduction gears.

A wheel comprising the two-stage planetary reduction mechanism of any of the embodiments described above, further comprising: the driving device is connected with the central transmission component, the hub is sleeved with the two-stage planetary transmission component, and the tire is sleeved with the hub; the hub is connected with one of the main shaft, the primary gear ring and the secondary gear ring.

The wheel is provided with an improved two-stage planetary reduction mechanism, wherein the first-stage planetary wheel and the second-stage planetary wheel are arranged coaxially and at the same speed, and different rotating speed outputs are realized by arranging different pitch circle radiuses. Because the coaxial arrangement is adopted, the two sides of a planetary system formed by the primary planet wheel and the secondary planet wheel are stressed evenly, the planet shaft and the planet carrier are not easy to damage, and rotating shafts do not need to be arranged separately for the planet wheels at all levels, so that the using amount of the rotating shafts is reduced. Through the design, the coaxial two-stage planetary structure design with different speeds is adopted, and the purposes of prolonging the service life, reducing the equipment cost and the like are achieved.

Drawings

Fig. 1 is a perspective view of a two-stage planetary reduction mechanism according to an embodiment of the present invention;

fig. 2 is a half sectional view of the two-stage planetary reduction mechanism shown in fig. 1;

FIG. 3 is an exploded view of the two-stage planetary reduction mechanism shown in FIG. 1;

FIG. 4 is a partial view of the two-stage planetary reduction mechanism shown in FIG. 1;

FIG. 5 is a schematic diagram of the two-stage planetary reduction mechanism shown in FIG. 1;

fig. 6 is a perspective view of a wheel according to an embodiment of the present invention;

FIG. 7 is a perspective view of the wheel of FIG. 6 from another perspective;

figure 8 is a half cross-sectional view of the wheel shown in figure 6;

figure 9 is an exploded view of the wheel shown in figure 6.

The meaning of the reference symbols in the drawings is:

100-two-stage planetary reduction mechanism;

10-central transmission component, 11-main shaft, 12-primary sun gear, 13-secondary sun gear;

20-two-stage planetary transmission assembly, 21-planet carrier, 211-through hole, 22-planet shaft, 23-primary planet wheel, 24-primary ring gear, 25-secondary planet wheel, 26-secondary ring gear;

30-protective cover, 31-primary cover body, 311-accommodating cavity, 312-sealing cover and 32-secondary cover body;

41-first bearing, 42-second bearing, 43-third bearing, 44-fourth bearing;

200-driver, 201-stator, 202-rotor;

300-a hub;

400-tyre.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that 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", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As shown in fig. 1 to 5, a two-stage planetary reduction mechanism 100 according to an embodiment of the present invention is provided.

As shown in fig. 1 and 2, the two-stage planetary reduction mechanism 100 includes: a central drive assembly 10 and a two-stage planetary drive assembly 20 connected to the central drive assembly 10. The central transmission assembly 10 is used for connecting a driver to obtain power, and the two-stage planetary transmission assembly 20 is used for realizing two-stage output with different rotating speeds. Further, the center drive assembly 10 can also realize a rotational speed output different from that of the two-stage drive assembly, and finally realize a three-stage output of the rotational speed.

The two-stage planetary reduction mechanism 100 described above will be further described with reference to fig. 1 to 5.

As shown in fig. 2, the center drive assembly 10 includes: a main shaft 11, a primary sun gear 12 located on the main shaft 11, and a secondary sun gear 13 located on the main shaft 11. Wherein the primary sun gear 12 and the secondary sun gear 13 are coaxial and rotate at the same angular velocity. The pitch radii of the primary sun gear 12 and the secondary sun gear 13 are different.

As shown in fig. 2, the two-stage planetary transmission assembly 20 includes: the planet carrier 21 of cup jointing on main shaft 11, wear to establish on planet carrier 21 and be on a parallel with the planet axle 22 that main shaft 11 set up, be located the one end of planet axle 22 and mesh the one-level planet wheel 23 of one-level sun gear 12, mesh the one-level ring gear 24 of one-level planet wheel 23, be located the other end of planet axle 22 and mesh the second grade planet wheel 25 of second grade sun gear 13, and mesh the second grade ring gear 26 of second grade planet wheel 25. The primary ring gear 24 and the secondary ring gear 26 are both disposed around the main shaft 11. The primary planet 23 and the secondary planet 25 are coaxial and rotate at the same angular velocity. The primary planet wheels 23 and the secondary planet wheels 25 have different pitch circle radii. As shown in fig. 3, in the present embodiment, the carrier 21 is annular and has a through hole 211 formed along the axial direction for the planetary shaft 22 to pass through.

For example, as shown in fig. 5, in the present embodiment, the pitch circle radius of the primary sun gear 12 is larger than the pitch circle radius of the secondary sun gear 13. And the pitch circle radius of the primary planet wheels 23 is smaller than that of the secondary planet wheels 25. Therefore, in the present embodiment, the rotation speed output by the main shaft 11 is the maximum, the rotation speed output by the primary ring gear 24 is the middle, and the rotation speed output by the secondary ring gear 26 is the minimum.

As shown in fig. 3 and 4, in the present embodiment, one planetary shaft 22, one primary planetary gear 23, and one secondary planetary gear 25 constitute a two-stage planetary transmission unit. The two-stage planetary transmission assembly 20 is provided with a plurality of two-stage planetary transmission units. The planetary shafts 22 of the plurality of two-stage planetary gear units are symmetrically distributed around the main shaft 11. The plurality of two-stage planetary transmission assemblies 20 which are symmetrically distributed by taking the main shaft 11 as the center can reduce the load of a single planetary transmission assembly, and are beneficial to improving the running stability of the equipment and prolonging the service life.

It should be noted that the number of the two-stage planetary gear units is not limited to a plurality, and may be one. However, the use of a two-stage planetary transmission unit may cause lateral unbalance of the main shaft 11, so that the main shaft 11 is easily damaged. Therefore, in this embodiment, a plurality of two-stage planetary transmission units symmetrically distributed around the main shaft 11 is preferably selected.

For example, as shown in fig. 3 and 4, in the present embodiment, the two-stage planetary gear assembly 20 is provided with three two-stage planetary gear units. The connecting lines of the central points of the planetary shafts 22 of the three two-stage planetary transmission units are in an equilateral triangle. Three planetary transmission units distributed in an equilateral triangle are high in stability, and the use amount of the planetary shafts 22 is small.

As shown in fig. 1 to 3, in the present embodiment, the two-stage planetary reduction mechanism 100 may further include: a protective cover 30 enclosing the central drive assembly 10 and the two-stage planetary drive assembly 20. As shown in fig. 2 and 3, in the present embodiment, the protective cover 30 includes: a primary cover body 31 and a secondary cover body 32 which are sleeved with each other. Wherein, the primary cover 31 and the secondary cover 32 are both arranged along the main shaft 11. The primary ring gear 24 is located inside the primary cover 31. The secondary toothed ring 26 is located inside the secondary shroud 32. The primary cover 31 and the secondary cover 32 not only can protect the devices wrapped inside, but also can be used as transmission members between the primary toothed ring 24 and the secondary toothed ring 26 and external devices.

Furthermore, as shown in fig. 2, in the present embodiment, the primary cover 31 may be provided with an accommodating cavity 311 for accommodating the driver. The accommodating cavity 311 may be used to accommodate a driver, and plays a role in accommodating and protecting the driver.

Further, as shown in FIG. 2, the end of the primary housing 31 facing away from the secondary housing 32 may be provided with a removable cover 312. The removable cover 312 facilitates installation and removal of the actuator from within the primary enclosure 31.

In order to improve the stability of the operation of the device and the flexibility of the action, bearings may be provided between the components that need to be connected in a relative rotation.

For example, as shown in fig. 2, in the present embodiment, the primary cover 31 and the secondary cover 32 are connected by a first bearing 41. The first bearing 41 can realize stable and relatively rotatable connection between the primary cover body 31 and the secondary cover body 32, and improve the stability and flexibility of equipment operation.

For another example, as shown in fig. 2, in the present embodiment, the main shaft 11 and the primary cover 31 are connected to each other by the second bearing 42. The main shaft 11 is connected with the secondary cover 32 through a third bearing 43. The second bearing 42 and the third bearing 43 can make the main shaft 11 respectively connected with the primary cover 31 and the secondary cover 32 in a stable and relatively rotatable manner, so that the stability and flexibility of the operation of the equipment are improved.

For another example, as shown in fig. 2, in the present embodiment, the carrier 21 and the primary cover 31 are connected to each other by a fourth bearing 44. The fourth bearing 44 can enable the planet carrier 21 and the primary cover 31 to be connected in a stable and relatively rotatable mode, and stability and flexibility of operation of the equipment are improved.

As shown in fig. 5, the primary planet wheels 23 and the secondary planet wheels 25 are arranged coaxially and at the same speed, and different rotating speed outputs are realized by arranging different pitch circle radiuses. Because of the adoption of coaxial arrangement, the two sides of a planetary system formed by the primary planet wheel 23 and the secondary planet wheel 25 are stressed evenly, the planet shaft 22 and the planet carrier 21 are not easy to damage, and rotating shafts do not need to be arranged separately for the planet wheels at all levels, so that the using amount of the rotating shafts is reduced.

In addition, the layout among the devices in the design is more compact, and the miniaturization design of the equipment is facilitated.

The two-stage planetary reduction mechanism 100 adopts a two-stage planetary structure design with different coaxial speeds, so that the purposes of prolonging the service life, reducing the equipment cost and the like are achieved.

As shown in fig. 6 to 9, the present solution also provides a wheel including the two-stage planetary reduction mechanism 100.

As shown in fig. 6 to 9, the wheel includes the two-stage planetary reduction mechanism 100 described above, and further includes: a drive 200 connected to the central drive assembly 10, a hub 300 journalled to the two-stage planetary drive assembly 20, and a tire 400 journalled to the hub 300. The hub 300 is connected to one of the main shaft 11, the primary ring gear 24, and the secondary ring gear 26.

The hub 300 may be connected to the main shaft 11, the primary ring gear 24, or the secondary ring gear 26, depending on the shift ratio.

As shown in fig. 6 and 8, in the present embodiment, the hub 300 is indirectly connected to the secondary ring gear 26 through the secondary cover 32, and the secondary ring gear 26 outputs the lowest rotation speed and the highest torque, so that the maximum speed reduction effect can be achieved.

Further, as shown in fig. 8, in the present embodiment, the driver 200 includes: a stator 201 installed in the primary cover 31, and a rotor 202 inserted into the center of the stator 201, and the rotor 202 is sleeved on the main shaft 11. When the driver 200 works, the rotor 202 drives the main shaft 11 to rotate, and then the main shaft 11 transmits the rotation to the primary planet wheels 23 and the secondary planet wheels 25, and finally transmits the rotation to the primary ring gear 24 and the secondary ring gear 26.

The wheel is provided with a modified two-stage planetary reduction mechanism 100, wherein the primary planet wheel 23 and the secondary planet wheel 25 are arranged coaxially and at the same speed, and different rotating speed outputs are realized by arranging different pitch circle radiuses. Because of the adoption of coaxial arrangement, the two sides of a planetary system formed by the primary planet wheel 23 and the secondary planet wheel 25 are stressed evenly, the planet shaft 22 and the planet carrier 21 are not easy to damage, and rotating shafts do not need to be arranged separately for the planet wheels at all levels, so that the using amount of the rotating shafts is reduced. Through the design, the coaxial two-stage planetary structure design with different speeds is adopted, and the purposes of prolonging the service life, reducing the equipment cost and the like are achieved.

The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A two-stage planetary reduction mechanism, comprising:

a central drive assembly; the central transmission assembly comprises: the device comprises a main shaft, a primary sun gear positioned on the main shaft and a secondary sun gear positioned on the main shaft; the primary sun gear and the secondary sun gear are coaxial and rotate at the same angular speed; the pitch circle radiuses of the primary sun gear and the secondary sun gear are different; and

the two-stage planetary transmission assembly is connected with the central transmission assembly; the two-stage planetary transmission assembly comprises: the planetary gear set comprises a planetary carrier sleeved on a main shaft, a planetary shaft arranged on the planetary carrier in a penetrating way and parallel to the main shaft, a primary planetary gear positioned at one end of the planetary shaft and meshed with a primary sun gear, a primary gear ring meshed with the primary planetary gear, a secondary planetary gear positioned at the other end of the planetary shaft and meshed with a secondary sun gear, and a secondary gear ring meshed with the secondary planetary gear; the primary gear ring and the secondary gear ring are arranged in a surrounding mode by taking the main shaft as a center; the primary planet gear and the secondary planet gear are coaxial and rotate at the same angular speed; the pitch circle radiuses of the primary planet wheels and the secondary planet wheels are different.

2. The two-stage planetary reduction mechanism according to claim 1, further comprising: a protective cover enclosing the central drive assembly and the two-stage planetary drive assembly; the protective cover includes: the first-stage cover body and the second-stage cover body are sleeved with each other; the primary cover body and the secondary cover body are arranged along the main shaft; the primary gear ring is positioned on the inner side of the primary cover body; the secondary toothed ring is positioned on the inner side of the secondary cover body.

3. The two-stage planetary reduction mechanism according to claim 2, wherein the primary cover and the secondary cover are connected by a first bearing.

4. The two-stage planetary reduction mechanism according to claim 2, wherein the main shaft is connected to the primary cover through a second bearing; the main shaft is connected with the secondary cover body through a third bearing.

5. The two-stage planetary reduction mechanism according to claim 2, wherein the carrier and the one-stage cover are connected by a fourth bearing.

6. A two-stage planetary reduction mechanism according to claim 2, wherein the one-stage housing is provided with a receiving cavity for receiving a driver.

7. A two-stage planetary reduction mechanism according to claim 6, wherein the end of the primary shroud facing away from the secondary shroud is provided with a removable cover.

8. A two-stage planetary reduction mechanism according to claim 1, wherein one of the planetary shafts, one of the primary planetary wheels, and one of the secondary planetary wheels constitute a two-stage planetary transmission unit; the two-stage planetary transmission assembly is provided with a plurality of two-stage planetary transmission units; the planetary shafts of the two-stage planetary transmission units are symmetrically distributed by taking the main shaft as a center.

9. The two-stage planetary reduction mechanism according to claim 8, wherein the two-stage planetary transmission assembly is provided with three of the two-stage planetary transmission units; the connecting lines of the central points of the planet shafts of the three two-stage planet transmission units are in an equilateral triangle.

10. A wheel comprising the two-stage planetary reduction mechanism according to any one of claims 1 to 9, further comprising: the driver is connected with the central transmission component, the hub is sleeved with the two-stage planetary transmission component, and the tire is sleeved with the hub; the hub is connected with one of the main shaft, the primary ring gear, and the secondary ring gear.

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