CN213839502U - Speed change and gear shift mechanism, speed changer and speed changer for pile driver - Google Patents

Abstract

The utility model discloses a speed change gearshift, include: positioning pins; the middle part of the shifting fork is rotationally connected with the positioning pin; the output end of the driving mechanism is connected with one end of the shifting fork; the base body is connected with the other end of the shifting fork; the end part of the gear shifting shaft is rotationally connected with the base body, and the gear shifting shaft can reciprocate along the axis direction of the gear shifting shaft along with the base body. The utility model discloses can solve the problem that the gearshift structure is complicated, with high costs among the current derailleur. The utility model also provides a derailleur and a derailleur that is used for the pile driver.

Description

Speed change and gear shift mechanism, speed changer and speed changer for pile driver

Technical Field

The utility model relates to a speed change mechanism field, in particular to speed change gear shifting mechanism, derailleur and be used for the derailleur of pile driver.

Background

The transmission is an important device in the field of machinery, can change a transmission ratio by generating speed change and torque change through different gear combinations, and expands the change range of rotating speed and torque, and is widely applied to industrial departments such as metallurgy, mines, hoisting transportation, electric power, energy, building and building materials, light industry, traffic and the like.

The shifting mechanism is an important component of a transmission, is used for switching different gear sets in the transmission and plays an important role in the transmission, but the existing shifting mechanism generally has the problem of easy locking, and in order to solve the problem, the patent publication number is 'US 646464613', the publication date is 10/15/2002, and the American patent document named as 'power shifting compound planetary transmission' discloses a transmission, which can effectively solve the problem of easy locking of a shifting shaft by realizing shifting through a clutch mode, but the transmission has many parts, is complex in structure and high in cost, and is not beneficial to production.

Therefore, how to simplify the structure of the shift mechanism is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the gearshift structure is complicated, with high costs among the current derailleur. The utility model provides a gearshift, derailleur and be used for the derailleur of pile driver can make the gearshift simple structure in the derailleur, reduce the cost.

In order to solve the technical problem, an embodiment of the utility model discloses a speed change gearshift, include:

positioning pins;

the middle part of the shifting fork is rotationally connected with the positioning pin;

the output end of the driving mechanism is connected with one end of the shifting fork;

the base body is connected with the other end of the shifting fork;

the end part of the gear shifting shaft is rotationally connected with the base body, and the gear shifting shaft can reciprocate along the axis direction of the gear shifting shaft along with the base body.

By adopting the technical scheme, the shifting fork is arranged between the driving mechanism and the shifting shaft, and two ends of the shifting fork are respectively connected with the driving mechanism and the shifting shaft, so that the shifting shaft can be driven to slide in a reciprocating manner along the axis direction of the shifting shaft to realize shifting.

Optionally, one end of the shifting fork is rotatably connected to the driving mechanism, the other end of the shifting fork is rotatably connected to the seat body, and two ends of the shifting fork can respectively slide on the extending end of the driving mechanism and the seat body.

Optionally, the output end of the driving mechanism is provided with a bar-shaped hole, one end of the shifting fork connected with the output end of the driving mechanism is provided with a first rotating shaft, the first rotating shaft is located in the bar-shaped hole, the seat body is provided with a second rotating shaft, one end of the shifting fork connected with the seat body is provided with a U-shaped groove, and the second rotating shaft is located in the U-shaped groove.

Optionally, a shift gear set is further included, the shift gear set comprising:

the adjusting gear is arranged on the gear shifting shaft;

the axis of the intermediate gear is superposed with the axis of the adjusting gear, external teeth are arranged on the outer circumferential surface of the intermediate gear, a hole is formed in the center of the intermediate gear, and internal teeth are arranged in the hole;

a change gear A engaged with the external teeth of the intermediate gear;

a speed change gear B arranged along the axial direction of the speed change gear A;

when the adjusting gear slides to the first position, the adjusting gear transmits power through the intermediate gear; when the adjusting gear slides to the second position, the adjusting gear transmits power through the speed changing gear B;

wherein the first position is a position defined by the adjustment gear meshing with the intermediate gear; the second position is a position defined by the engagement of the adjustment gear with the speed change gear B.

According to the utility model discloses a further embodiment, the utility model discloses still provide a derailleur, including aforementioned any kind of variable speed gearshift, still include the casing and locate the inside change gear unit of casing, inside the casing was located to variable speed gearshift to link to each other with change gear unit.

Optionally, the speed change gear set includes a first gear set comprising:

the first inner gear ring is arranged in the shell, and the axis of the first inner gear ring is superposed with the axis of the adjusting gear;

the first planet carrier is arranged inside the shell;

the planetary shafts are arranged on the first planetary frame, and are uniformly distributed and arrayed around the axis of the gear shifting shaft;

the speed change gear A and the speed change gear B are both rotationally connected to the planet shaft and fixedly connected to the speed change gear A and the speed change gear B on the same planet shaft, the intermediate gear is rotationally connected to the shell, and the first inner gear ring is meshed with the speed change gear A or the speed change gear B.

Optionally, the planetary gear set further comprises an output shaft, and the output shaft is directly or indirectly connected with the first planet carrier.

Optionally, the output shaft is of unitary construction with the first carrier.

Optionally, the gear shifting device further comprises a motor, the motor is mounted on the shell, the output end of the motor is connected with a spline, a spline groove matched with the spline is formed in the end portion of the gear shifting shaft, and the spline is in sliding connection with the spline groove.

Optionally, the speed change gear set further comprises a second gear set disposed between the output shaft and the first carrier.

Optionally, the second gear set comprises:

the second inner gear ring is arranged in the shell, and the axis of the second inner gear ring is superposed with the axis of the adjusting gear;

the second planet carrier is arranged inside the shell;

the planet gears are rotationally connected to the second planet carrier, and the planet gears are provided with a plurality of planet gears which are uniformly distributed and arrayed around the axis of the second inner gear ring;

and the sun wheel is connected with the first planet carrier, the axis of the sun wheel is overlapped with the axis of the second inner gear ring, and the sun wheel is meshed with the planet wheels.

Optionally, the output shaft and the second planet carrier are of an integral structure.

By adopting the technical scheme, the first planet carrier or the second planet carrier and the output shaft are designed into an integral structure, so that the firmness of the output shaft can be improved, and the problems of unstable installation and unstable connection of the output shaft are effectively solved.

Optionally, the drive mechanism is provided on the housing.

By adopting the technical scheme, the driving mechanism is arranged on the shell, so that the positioning precision of the driving mechanism can be enhanced, and the position deviation generated when the output end of the driving mechanism is connected with the shifting fork is prevented.

Optionally, a limiting member is disposed on the output shaft, and the limiting member is located below the housing and is used for limiting the output shaft from moving upward relative to the housing.

Optionally, the limiting member is a nut, and the nut is in threaded connection with the output shaft.

When the output shaft is installed in the shell from the upper side of the shell, the output shaft can move upwards relative to the shell due to the fact that the lower portion of the output shaft is lack of limiting parts.

Optionally, a groove body is formed below the shell, a sealing element is arranged in the groove body, and the inner surface of the sealing element is tightly attached to the outer surface of the nut.

Adopt above-mentioned technical scheme, through setting up the sealing member, can effectively prevent that the dust from getting into and causing the harm to the derailleur in the casing.

Optionally, a protective cover is further disposed below the housing, a hole is formed in the protective cover, and an end of the output shaft extends out of the housing through the hole.

Adopt above-mentioned technical scheme, through setting up the protective cover, can prevent effectively that external foreign matter from causing the destruction to the sealing member.

According to the utility model discloses a further embodiment, the utility model discloses still provide a derailleur for pile driver, including any kind of preceding derailleur, still include the adapter sleeve, the one end of adapter sleeve links to each other with the casing, and the other end of adapter sleeve links to each other with the pile driver.

Drawings

Fig. 1 is a perspective view of a transmission according to an embodiment of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a sectional view taken along line B-B of FIG. 2;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 6 is a sectional view taken along line D-D of FIG. 4;

FIG. 7 is an enlarged view of a portion E of FIG. 4;

fig. 8 is a partially enlarged view of portion F of fig. 4;

FIG. 9 is a schematic view of the driving mechanism, the fork and the shift shaft of FIG. 3;

fig. 10 is a perspective view of a transmission for a pile driver according to an embodiment of the present invention.

Reference numerals:

1. a motor;

2. a shift shaft;

3. an adjusting gear;

4. a drive mechanism;

5. positioning pins;

6. a shifting fork;

7. connecting sleeves;

8. an output shaft;

9. a base body;

11. a housing;

12. a first gear set;

13. a second gear set;

14. a first ring gear;

15. a first carrier;

16. a planet shaft;

17. an intermediate gear;

18. a change gear A;

19. a change gear B;

20. a strip-shaped hole;

21. a first rotating shaft;

22. a second rotating shaft;

a U-shaped slot;

24. a second ring gear;

25. a second planet carrier;

26. a planet wheel;

27. a sun gear;

28. a limiting member;

29. a seal member;

30. a protective cover.

Detailed Description

The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to only those embodiments. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover other alternatives or modifications which may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the element to which the present invention is directed must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, and may be, for example, a fixed connection or a detachable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 9 in combination with fig. 3, an embodiment of the present invention provides a speed change gear shift mechanism, including:

a housing 11;

a driving mechanism 4 fixedly connected to the housing 11, wherein the driving mechanism 4 is a hydraulic cylinder in an embodiment of the present invention, and an extending end of the driving mechanism extends into the housing 11 and can move in a vertical direction;

a shift shaft 2 slidably connected to the housing 11, the shift shaft 2 being movable up and down along its axis with respect to the housing 11;

a seat body 9 rotatably connected with the top of the shift shaft 2;

a positioning pin 5 fixed to the housing 11;

a shifting fork 6 with the middle part rotationally connected with the positioning pin 5, one end of the shifting fork is rotationally connected with the extending end of the driving mechanism 4, the other end of the shifting fork is rotationally connected with the seat body 9, and two ends of the shifting fork 6 can respectively slide on the extending end of the driving mechanism 4 and the seat body 9; the shifting fork 6 is used for transmitting the extending end of the driving mechanism 4 to the base body 9 and driving the base body 9 to move in the vertical direction along the upward movement in the vertical direction, so that the shifting shaft 2 is driven to move in the vertical direction. The seat body 9 can move along the vertical direction under the driving of the shifting fork 6, but can not rotate, and the gear shifting shaft 2 can rotate relative to the seat body 9 around the axis thereof.

Continuing with fig. 9, in this embodiment, specifically, the output end of the driving mechanism 4 is provided with a bar-shaped hole 20, one end of the shifting fork 6 connected to the output end of the driving mechanism 4 is provided with a first rotating shaft 21, and the first rotating shaft 21 is located in the bar-shaped hole 20 and can slide in the bar-shaped hole 20. The seat body 9 is provided with a second rotating shaft 22, one end of the shifting fork 6 connected with the seat body 9 is provided with a U-shaped groove 23, and the second rotating shaft 22 is positioned in the U-shaped groove 23 and can slide in the U-shaped groove 23.

When the extending end of the driving mechanism 4 extends, the end, connected with the extending end of the driving mechanism 4, of the shifting fork 6 is stressed, the shifting fork 6 rotates anticlockwise around the positioning pin 5, the end, connected with the gear shifting shaft 2, of the shifting fork 6 drives the seat body 9 and the gear shifting shaft 2 to slide upwards, when the extending end of the driving mechanism 4 retracts, the shifting fork 6 rotates clockwise around the positioning pin 5, and the end, connected with the seat body 9, of the shifting fork 6 drives the seat body 9 and the gear shifting shaft 2 to slide downwards.

The existing gear shifting mechanism adopts a clutch mode to realize gear shifting in order to solve the problem that a gear shifting shaft is easy to block, but the clutch structure needs a plurality of parts, is complex in structure and high in cost, and is not beneficial to production. This embodiment is through setting up shift fork 6 between actuating mechanism 4 and the gear shift shaft 2 along with pedestal 9 gliding from top to bottom to make 6 both ends of shift fork link to each other with actuating mechanism 4 and pedestal 9 respectively, drive gear shift shaft 2 along its axis direction reciprocating sliding, thereby make gear shift shaft 2 be difficult to the card dead at the slip in-process, and spare part is few, simple structure, can effective reduce cost. In addition, by arranging the driving mechanism 4 and the positioning pin 5 on the housing 11, the positioning accuracy of the driving mechanism 4 relative to the positioning pin 5 can be enhanced, so that the position deviation generated when the output end of the driving mechanism 4 is connected with the shifting fork 6 arranged on the positioning pin 5 is prevented, and the positioning accuracy among the driving mechanism 4, the positioning pin 5 and the gear shifting shaft 2 is also favorably ensured.

As shown in fig. 4 to 7, the utility model discloses still include gear shift gear set, gear shift gear set includes: an adjusting gear 3 fixedly connected to the shift shaft 2; an intermediate gear 17 rotatably connected to the housing 11, wherein an axis of the intermediate gear 17 coincides with an axis of the adjusting gear 3, outer teeth are provided on an outer circumferential surface of the intermediate gear 17, a hole is provided at a center of the intermediate gear 17, and inner teeth are provided in the hole; a transmission gear a18 meshing with the external teeth of the intermediate gear 17; a speed change gear B19 provided along the axial direction of the speed change gear a 18.

When the adjusting gear 3 slides to the first position, the gear 3 transmits power through the intermediate gear 17 and the speed change gear a 18; when the adjusting gear 3 slides to the second position, the adjusting gear 3 transmits power through the speed change gear B19. Wherein the first position is a position defined by the adjustment gear 3 meshing with the intermediate gear 17; the second position is a position defined by the engagement of the adjusting gear 3 with the speed change gear B19. When the extending end of the driving mechanism 4 extends out to drive the gear shifting shaft 2 to move upwards, the adjusting gear 3 is meshed with the intermediate gear 17; when the extended end of the driving mechanism 4 retracts to move the shift shaft 2 downward, the adjusting gear 3 is engaged with the speed changing gear B19. By sliding the gear shift shaft 2, the adjusting gear 3 can be engaged with different gears, thereby realizing gear shift and speed change.

As shown in fig. 1-3, the utility model discloses an embodiment still provides a transmission, include as above the variable speed gearshift, still include motor 1, it is installed on casing 11, and the output of motor 1 is connected with the spline, and the tip of selector shaft 2 is equipped with the spline groove with spline matched with, and the spline can slide along the axis direction of selector shaft 2 in the spline groove.

A speed change gear set is arranged in the housing 11, the speed change gear set includes a first gear set 12, the first gear set 12 is a planetary gear train, and includes: a first inner gear ring 14 fixedly connected to the inside of the housing 11, the axis of which coincides with the axis of the adjusting gear 3; a first carrier 15 rotatably connected to the housing 11; an output shaft 8 connected directly or indirectly to the first carrier 15; a plurality of planetary shafts 16 fixedly connected to the carrier a15, the planetary shafts 16 being arranged in a uniform arrangement around the axis of the first ring gear 14. Speed change gear a18 and speed change gear B19 are both rotationally connected to planetary shaft 16, and speed change gear a18 and speed change gear B19 on the same planetary shaft 16 are fixedly connected, and first ring gear 14 is meshed with speed change gear a18 or speed change gear B19.

When the adjustment gear 3 rotates the speed change gear a18 or the speed change gear B19, the speed change gear a18 or the speed change gear B19 revolves around the axis of the first ring gear 14 while rotating around the planetary shaft 16, thereby rotating the first carrier 15 and the output shaft 8, and outputting the power after speed change from the output shaft 8. The output shaft 8 and the first planet carrier 15 can be of an integrated structure and can be connected by a fixing piece, and a plurality of groups of speed change gear sets can be arranged between the output shaft and the first planet carrier to realize multi-stage speed reduction.

Here, taking an example that a set of gear sets is disposed between the output shaft 8 and the first carrier 15, the speed change gear set further includes a second gear set 13, the second gear set 13 is disposed between the output shaft 8 and the first carrier 15, and the second gear set 13 is a planetary gear train, including: a second inner gear ring 24 fixedly connected to the inside of the housing 11, the axis of which coincides with the axis of the adjusting gear 3; a second planet carrier 25 rotatably connected to the housing 11 and formed integrally with the output shaft 8; a plurality of planet gears 26 rotatably connected to the second planet carrier 25, the planet gears 26 being arranged uniformly around the axis of the second ring gear 24; a sun gear 27 fixedly connected to the first carrier 15 has an axis coinciding with the axis of the second ring gear 24, and the sun gear 27 meshes with the respective planetary gears 26.

When power is output from the first carrier 15, the sun gear 27 fixedly connected to the first carrier 15 drives each planet gear 26 to run, and each planet gear 26 rotates around the axis thereof and simultaneously revolves around the axis of the second ring gear 24, so that the second carrier 25 and the output shaft 8 are driven to rotate, and the power after speed change is output. Wherein, through designing second planet carrier 25 and output shaft 8 structure as an organic whole, can improve the fastness of output shaft to effectively prevent output shaft installation unstability and the insecure problem of connection.

As shown in fig. 8, the output shaft 8 is provided with a limiting member 28, and the limiting member 28 is located below the housing 11 (in a direction opposite to the position of the motor 1) and is used for limiting the output shaft 8 from moving upward relative to the housing 11. The specific structure of the limiting member 28 is not limited in the present application, and specifically, the limiting member 28 may be a nut, and the nut is connected to the output shaft 8 through a thread. In an embodiment of the present application, a bearing may be disposed between the output shaft 8 and the housing 11 to realize rotational connection between the output shaft 8 and the housing 11, and an upper surface of the nut is attached to a lower surface of the inner ring of the bearing to realize a limiting effect. Because the second planet carrier 25 and the output shaft 8 are integrated in the embodiment, the output shaft 8 can only be put into the housing 11 from above the housing 11, the output shaft 8 can move upwards relative to the housing 11 due to lack of limit at the lower part, the limit part 28 is arranged to prevent the output shaft 8 from moving upwards relative to the housing 11, and the nut can also provide proper pre-tightening force for the bearing, so that the rigidity of the output shaft 8 is improved.

Furthermore, a groove body is formed below the shell 11, a sealing element 29 is arranged in the groove body, and the inner surface of the sealing element 29 is tightly attached to the outer surface of the nut. By providing the seal 29, dust can be effectively prevented from entering the housing 11 to damage the transmission, and oil leakage in the transmission can be effectively prevented.

Further, a protective cover 30 is further arranged below the shell 11, a hole is formed in the protective cover 30, the end portion of the output shaft 8 extends out of the shell 11 through the hole, and the protective cover 30 is arranged, so that damage to the sealing element 29 caused by external foreign matters can be effectively prevented.

In addition, as shown in fig. 10, the embodiment of the present invention further provides a transmission for a pile driver, including the transmission as described above, further including a connecting sleeve 7, one end of the connecting sleeve 7 is connected to the housing 11, and the other end of the connecting sleeve 7 is connected to the pile driver.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, and the specific embodiments thereof are not to be considered as limiting. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (18)

1. A variable speed shifting mechanism, comprising:

positioning pins;

the middle part of the shifting fork is rotationally connected with the positioning pin;

the output end of the driving mechanism is connected with one end of the shifting fork;

the base body is connected with the other end of the shifting fork;

and the end part of the gear shifting shaft is rotationally connected with the base body, and the gear shifting shaft can reciprocate along the axial direction of the gear shifting shaft along with the base body.

2. A gearshift mechanism according to claim 1, wherein one end of the fork is rotatably connected to the drive mechanism and the other end of the fork is rotatably connected to the housing, and wherein the fork has two ends that slide on the extended end of the drive mechanism and the housing, respectively.

3. The gearshift mechanism of claim 2, wherein the output end of the drive mechanism has a bar-shaped hole, the fork has a first pivot shaft at an end thereof connected to the output end of the drive mechanism, the first pivot shaft is located in the bar-shaped hole, the housing has a second pivot shaft, the fork has a U-shaped slot at an end thereof connected to the housing, and the second pivot shaft is located in the U-shaped slot.

4. The variable speed shift mechanism of any one of claims 1 to 3, further comprising a shift gear set, the shift gear set comprising:

the adjusting gear is arranged on the gear shifting shaft;

the axis of the intermediate gear is superposed with the axis of the adjusting gear, external teeth are arranged on the outer circumferential surface of the intermediate gear, a hole is formed in the center of the intermediate gear, and internal teeth are arranged in the hole;

a transmission gear A engaged with the external teeth of the intermediate gear;

a speed change gear B provided along an axial direction of the speed change gear A;

when the adjusting gear slides to a first position, the adjusting gear transmits power through the intermediate gear; when the adjusting gear slides to the second position, the adjusting gear transmits power through the speed change gear B;

wherein the first position is a position defined by the adjustment gear meshing with the intermediate gear; the second position is a position defined by the adjustment gear meshing with the speed change gear B.

5. A transmission comprising the gearshift mechanism of claim 4 and further comprising a housing and a gear set disposed within the housing, wherein the gearshift mechanism is disposed within the housing and is connected to the gear set.

6. The transmission of claim 5, wherein the speed change gear set comprises a first gear set comprising:

the first inner gear ring is arranged in the shell, and the axis of the first inner gear ring is superposed with the axis of the adjusting gear;

the first planet carrier is arranged inside the shell;

the planetary shafts are arranged on the first planetary frame, and are uniformly distributed and arrayed around the axis of the gear shifting shaft;

the speed change gear A and the speed change gear B are both rotationally connected to the planet shaft and are located on the same planet shaft, the speed change gear A and the speed change gear B are fixedly connected, the intermediate gear is rotationally connected to the shell, and the first inner gear ring is meshed with the speed change gear A or the speed change gear B.

7. The transmission of claim 6, further comprising an output shaft, the output shaft being directly or indirectly connected to the first carrier.

8. The transmission of claim 7, wherein the output shaft is a unitary structure with the first carrier.

9. The transmission of claim 5, further comprising a motor mounted on the housing, wherein the output of the motor is connected with a spline, the end of the shift shaft is provided with a spline groove matched with the spline, and the spline is slidably connected with the spline groove.

10. The transmission of claim 7, wherein the speed change gear set further comprises a second gear set disposed between the output shaft and the first carrier.

11. The transmission of claim 10, wherein the second gear set comprises:

the second inner gear ring is arranged in the shell, and the axis of the second inner gear ring is superposed with the axis of the adjusting gear;

the second planet carrier is arranged inside the shell;

the planet gears are rotationally connected to the second planet carrier, and the planet gears are provided with a plurality of planet gears which are uniformly distributed and arrayed around the axis of the second inner gear ring;

and the sun wheel is connected with the first planet carrier, the axis of the sun wheel is overlapped with the axis of the second inner gear ring, and the sun wheel is meshed with the planet wheels.

12. The transmission of claim 11, wherein the output shaft is a unitary structure with the second carrier.

13. The transmission of claim 5, wherein the drive mechanism is disposed on the housing.

14. The transmission of claim 7, wherein the output shaft has a stop located thereon, the stop being located below the housing for limiting upward movement of the output shaft relative to the housing.

15. The transmission of claim 14, wherein the retaining member is a nut that is threadably coupled to the output shaft.

16. The transmission of claim 15, wherein a groove is formed below the housing, a sealing element is disposed in the groove, and an inner surface of the sealing element is closely attached to an outer surface of the nut.

17. The transmission of claim 16, wherein a protective cover is disposed below the housing, the protective cover having a hole formed therein, and an end of the output shaft extends out of the housing through the hole.

18. A transmission for a pile driver comprising a transmission according to any one of claims 5 to 13 and a connecting sleeve, one end of the connecting sleeve being connected to the housing and the other end of the connecting sleeve being connected to the pile driver.

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