CN219692152U - Multi-speed transmission - Google Patents

Abstract

The utility model belongs to the technical field of sprinkling irrigation equipment, and discloses a multi-gear speed changing device, which comprises a box body, a worm assembly, a worm wheel assembly, an output assembly and a gear shifting assembly, wherein the worm assembly is arranged on the box body; the worm assembly is in transmission connection with the power input piece; the worm assembly is in transmission connection with the worm wheel assembly; the output assembly comprises an output shaft extending along the Z-axis direction and a plurality of output wheels which are arranged at intervals and fixedly sleeved on the periphery of the output shaft, and the diameters of the plurality of output wheels are different; the gear shifting assembly is in transmission connection with the worm gear assembly and the output assembly respectively, the gear shifting assembly comprises a gear shifting shaft extending along the Z-axis direction and a plurality of gear shifting wheels which are arranged at intervals and sleeved on the periphery of the gear shifting shaft, the diameters of the gear shifting wheels are different, and the gear shifting shaft is adjustably inserted into the box body along the Z-axis direction. The multi-gear speed changing device ensures stable transmission and reduces noise by optimizing the gear shifting structure.

Description

Multi-speed transmission

Technical Field

The utility model relates to the technical field of sprinkling irrigation equipment, in particular to a multi-gear speed changing device.

Background

The rotary spray irrigation equipment is widely applied to the field of agricultural irrigation, the rotary spray irrigation equipment is provided with a spray gun on a rotary device, the rotary device drives the spray gun to rotate, the spray gun sprays water flow into the air to form water mist, and the water mist drops to the ground to irrigate crops. The existing rotary spray irrigation equipment is also provided with a speed changer, the rotating speed of a spray gun is regulated through the speed changer, such as a speed changer and the spray gun with the application number of CN202210833307.4, the speed changer comprises a shell, an input shaft, a first speed changing component, a second speed changing component and a combining sleeve, when the speed changer needs to be switched to a gear corresponding to the first speed changing component, a first gear ring is controlled to move towards a direction close to the combining sleeve, the first gear ring is meshed with the combining sleeve and then stops rotating and keeps fixed, a second gear ring is meshed with a second fixed gear while meshed with a second planetary gear, when torque is input and drives the input shaft to rotate, a first sun wheel synchronously rotates along with the input shaft, the first sun wheel drives the first rotary shaft to rotate through the first planetary gear, the second sun wheel synchronously rotates along with the first rotary shaft, the second gear ring, the second planetary gear and the second fixed gear are locked, and the first rotary shaft and the second rotary shaft rotate at the same speed, so that the torque after speed change can directly pass through the second rotary shaft, and the torque after speed change through the first speed changing component is output; when the gear corresponding to the second speed changing assembly is required to be switched, the first gear ring slides in the direction away from the combining sleeve, so that the first gear ring is meshed with the first fixedly connected gear simultaneously on the basis of meshing with the first planet gears, the second gear ring is controlled to move in the direction close to the combining sleeve, the second gear ring is meshed with the combining sleeve simultaneously on the basis of meshing with the second planet gears, the second gear ring stops rotating and keeps fixed after being meshed with the combining sleeve, when torque is input and drives the input shaft to rotate, the first sun gear synchronously rotates along with the input shaft, and the first gear ring is meshed with the first planet gears and the first fixedly connected gear simultaneously, so that the first gear ring, the first planet gears and the first fixedly connected gear are locked, and do not rotate relatively to each other, so that the input shaft and the first rotating shaft rotate at the same speed, the torque can directly pass through the first rotating shaft, the second sun gear can synchronously rotate through the first rotating shaft, and the second sun gear can drive the second rotating shaft through the second planet gears to rotate, and then the torque after being changed through the second speed changing assembly is output, and the two gear positions are switched.

But the structure of the speed changer in the existing sprinkling irrigation equipment is too complex, the center distance of gear engagement cannot be kept stable for a long time, and noise is easy to generate in the later period of use of the sprinkling irrigation equipment.

Therefore, a multi-gear speed change device is needed, a gear shifting structure is optimized, transmission stability is guaranteed, and noise is reduced.

Disclosure of Invention

One object of the present utility model is to: the multi-gear speed change device is provided, a gear shifting structure is optimized, transmission stability is guaranteed, and noise is reduced.

To achieve the purpose, the utility model adopts the following technical scheme:

a multi-speed transmission comprising:

a case;

the worm assembly is rotatably arranged on the box body and is used for being in transmission connection with the power input piece;

the worm assembly is rotatably arranged on the box body, and the worm assembly is in transmission connection with the worm assembly;

the output assembly is rotatably arranged on the box body and comprises an output shaft extending along the Z-axis direction and a plurality of output wheels which are arranged at intervals and fixedly sleeved on the periphery of the output shaft, and the diameters of the plurality of output wheels are different;

the gear shifting assembly is installed in the box, the gear shifting assembly is respectively connected with the worm gear assembly and the output assembly in a transmission mode, the gear shifting assembly comprises a gear shifting shaft extending along the Z-axis direction and a plurality of gear shifting wheels arranged at intervals and sleeved on the periphery of the gear shifting shaft, the gear shifting wheels are different in diameter, the gear shifting shaft is adjustably inserted into the box along the Z-axis direction, the multi-gear speed changing device is in various output states, and when the multi-gear speed changing device is switched to one of the output states, one of the gear shifting wheels is meshed with the corresponding output wheel.

As an optional technical scheme, a first limiting hole is formed in a side wall of the box body, a second limiting column is arranged on the inner wall of the box body facing the first limiting hole, a second limiting hole with a preset depth is formed in the second limiting column, the first limiting hole and the second limiting hole are coaxially arranged, and the shifting shaft is tightly inserted into the first limiting hole and the second limiting hole.

As an optional solution, the multi-speed transmission further includes:

the locking assembly is arranged on the box body, a plurality of limiting ring grooves are formed in the periphery of the shifting gear shaft at intervals along the Z-axis direction, and one shifting gear is meshed and connected with the corresponding output gear when the locking assembly is alternatively abutted to the limiting ring grooves.

As an alternative solution, the locking assembly includes:

the box body is provided with a threaded mounting hole, and the threaded fastener is mounted in the threaded mounting hole;

an elastic piece positioned between the threaded fastener and the shift shaft;

the limiting piece is positioned between the elastic piece and the shifting block shaft and is used for pushing the limiting piece to be abutted to the shifting block shaft.

As an optional technical scheme, the elastic piece is a straight cylinder spring, and the limiting piece is a marble.

As an optional technical scheme, the number of the output wheels is three, the number of the three output wheels is respectively a high-speed output wheel, a medium-speed output wheel and a low-speed output wheel, the number of the gear shifting wheels is three, the number of the three gear shifting wheels is respectively a high-speed gear shifting wheel, a medium-speed gear shifting wheel and a low-speed gear shifting wheel, the number of the limit ring grooves is three, and the number of the three limit ring grooves is respectively a high-speed limit ring groove, a medium-speed limit ring groove and a low-speed limit ring groove;

when the locking component is abutted against the high-speed limiting ring groove, the high-speed regulating wheel is in meshed connection with the high-speed output wheel, and the multi-gear speed changing device is switched to a high-speed output state;

when the locking component is abutted against the middle speed limit ring groove, the middle speed shift wheel is meshed with the middle speed output wheel, and the multi-gear speed change device is switched to a middle speed output state;

when the locking component is abutted to the low-speed limiting ring groove, the low-speed regulating wheel is meshed with the low-speed output wheel, and the multi-gear speed changing device is switched to a low-speed output state.

As an optional technical solution, the medium speed gear wheel is located between the high speed gear wheel and the low speed gear wheel, and the medium speed output wheel is located between the high speed output wheel and the low speed output wheel.

As an optional technical scheme, the worm gear assembly comprises a primary gear, the gear shifting assembly further comprises a secondary gear, the primary gear is in transmission connection with the secondary gear, and the secondary gear is in transmission connection with the high-speed gear, the medium-speed gear and the low-speed gear respectively.

As an optional technical scheme, the high-speed gear wheel, the secondary gear wheel and the medium-speed gear wheel are integrally arranged as a gear shifting piece.

As an optional technical scheme, the gear shifting assembly further comprises a transmission sleeve, the transmission sleeve and the low-speed gear shifting wheel are integrally arranged, the transmission sleeve is sleeved on the periphery of the gear shifting shaft, one end, away from the low-speed gear shifting wheel, of the transmission sleeve extends into the inner wall of the gear shifting piece, and the transmission sleeve is in transmission connection with the gear shifting piece.

The utility model has the beneficial effects that:

the utility model provides a multi-gear speed changing device, which comprises a box body, a worm assembly, a worm gear assembly, an output assembly and a gear shifting assembly, wherein an output shaft is arranged in parallel with a gear shifting shaft, and both the output shaft and the gear shifting shaft extend along the Z-axis direction. In the utility model, the central axis of the output shaft is parallel to the central axis of the shift shaft, so that the gear meshing center distance between the shift wheel and the output wheel is stable and accurate, the power transmission is stable, and the noise is reduced.

Drawings

The utility model is described in further detail below with reference to the drawings and examples;

FIG. 1 is a schematic view of a first perspective of a multi-speed transmission according to an embodiment;

FIG. 2 is a schematic diagram of a second view of a multi-speed transmission (not shown) according to an embodiment;

FIG. 3 is a schematic view of a third view of a multi-speed transmission (not shown) according to an embodiment;

FIG. 4 is a schematic view of the structure of the upper cover according to the embodiment;

fig. 5 is a schematic structural view of a bottom case according to an embodiment;

fig. 6 is a cross-sectional view of the bottom chassis according to the embodiment.

In the figure:

1. a case; 11. a first limiting hole; 12. the second limit column; 13. a second limiting hole; 14. a threaded mounting hole; 15. the third limit column; 16. a fourth limit column;

2. a worm assembly; 21. a worm;

3. a worm gear assembly; 31. a primary gear; 32. a worm wheel;

4. an output assembly; 41. an output shaft; 42. a high speed output wheel; 43. a medium speed output wheel; 44. a low speed output wheel;

5. a gear shifting assembly; 51. a shift shaft; 511. high-speed limiting ring groove; 512. medium speed limit ring groove; 513. a low-speed limiting ring groove; 52. a high speed gear wheel; 53. a medium speed shift wheel; 54. a low speed shift wheel; 55. a secondary gear; 56. a transmission sleeve;

6. a locking assembly; 61. a threaded fastener; 62. an elastic member; 63. a limiting piece;

7. an injection nozzle;

8. an impeller.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Embodiment one:

as shown in fig. 1 to 6, the present embodiment provides a multi-speed transmission including a case 1, a worm assembly 2, a worm wheel assembly 3, an output assembly 4, and a shift assembly 5; the worm assembly 2 is rotatably arranged on the box body 1, and the worm assembly 2 is used for being in transmission connection with the power input piece; the worm wheel assembly 3 is rotatably arranged on the box body 1, and the worm assembly 2 is in transmission connection with the worm wheel assembly 3; the output assembly 4 is rotatably mounted on the box body 1, the output assembly 4 comprises an output shaft 41 extending along the Z-axis direction and a plurality of output wheels which are arranged at intervals and fixedly sleeved on the periphery of the output shaft 41, and the diameters of the plurality of output wheels are different; the gear shifting assembly 5 is arranged on the box body 1, the gear shifting assembly 5 is respectively in transmission connection with the worm gear assembly 3 and the output assembly 4, the gear shifting assembly 5 comprises a gear shifting shaft 51 extending along the Z-axis direction and a plurality of gear shifting wheels which are arranged at intervals and sleeved on the periphery of the gear shifting shaft 51, the diameters of the gear shifting wheels are different, the gear shifting shaft 51 is adjustably inserted into the box body 1 along the Z-axis direction, the multi-gear speed changing device is provided with a plurality of output states, and when the multi-gear speed changing device is switched to one of the output states, one of the gear shifting wheels is meshed with the corresponding output wheel.

In this embodiment, the output shaft 41 and the shift shaft 51 are disposed in parallel, and both extend along the Z-axis direction, when the output state of the multi-gear transmission device needs to be adjusted, the shift shaft 51 is driven along the Z-axis direction, so that one of the shift wheels sleeved on the periphery of the shift shaft 51 is engaged with a corresponding one of the output wheels, the power input by the power input element sequentially passes through the worm assembly 2, the worm wheel assembly 3, the shift assembly 5 and the output assembly 4, and is output to the outside through the output shaft 41 of the output assembly 4, when the multi-gear transmission device needs to be adjusted to another output state, the shift shaft 51 is driven again along the Z-axis direction, so that the last shift wheel is separated from the corresponding output wheel, and the next shift wheel is engaged with the corresponding output wheel, and as the diameter of the last shift wheel is different from the diameter of the next shift wheel, the output rotation speed of the output shaft 41 is different, that is, the output state of the multi-gear transmission device is switched. In the present embodiment, since the central axis of the output shaft 41 is disposed parallel to the central axis of the shift shaft 51, the gear engagement center distance between the shift wheel and the output wheel is stable and accurate, so that the power transmission is stable and the noise is reduced.

In the present embodiment, the worm assembly 2 comprises a worm 21 and the worm gear assembly 3 comprises a worm wheel 32, the worm 21 being in meshed driving connection with the worm wheel 32.

Optionally, the box 1 includes drain pan and upper cover, and the upper cover is located on the drain pan, is provided with the sealing washer between the port of upper cover port and the port of drain pan, and the sealing washer can improve the sealed effect between upper cover port and the drain pan port.

Optionally, the upper cover is fixedly connected with the bottom shell through a locking screw.

Optionally, a first limiting hole 11 is formed in a side wall of the box body 1, a second limiting column 12 is arranged on the inner wall of the box body 1 facing the first limiting hole 11, a second limiting hole 13 with a preset depth is formed in the second limiting column 12, the first limiting hole 11 and the second limiting hole 13 are coaxially arranged, and the shift shaft 51 is tightly inserted into the first limiting hole 11 and the second limiting hole 13.

Specifically, when the position of the shift shaft 51 is adjusted along the Z-axis direction, the shift shaft 51 is not separated from the first limiting hole 11 and the second limiting hole 13, and the central axes of the shift shaft 51 are ensured to be parallel to the Z-axis by the first limiting hole 11 and the second limiting hole 13.

Optionally, the first limiting hole 11 is formed in the bottom shell, and the second limiting post 12 is formed in the upper cover.

Optionally, the bottom shell is provided with a third spacing post 15, the third spacing post 15 is provided with a third spacing hole, the upper cover is provided with a fourth spacing post 16, the fourth spacing post 16 is provided with a fourth spacing hole, the third spacing hole and the fourth spacing hole are coaxially arranged, and the output shaft 41 is tightly inserted in the third spacing hole and the fourth spacing hole. The central axis of the output shaft 41 is defined by the third limit post 15 and the fourth limit post 16 to ensure that the central axis of the output shaft 41 is parallel to the central axis of the shift shaft 51.

Optionally, the multi-gear speed changing device further includes a locking component 6, the locking component 6 is mounted on the box 1, a plurality of limiting ring grooves are spaced apart along the Z-axis direction on the circumference of the shift shaft 51, and when the locking component 6 is alternatively abutted to the limiting ring grooves, one of the shift wheels is engaged with a corresponding one of the output wheels.

The locking assembly 6 is abutted to the limiting ring groove, one of the gear wheels is meshed with the corresponding output wheel, the multi-gear speed changing device operates in a certain output state, and the locking assembly 6 can limit the shift shaft 51 to move along the Z-axis direction, so that the multi-gear speed changing device can keep the output state.

Optionally, the locking assembly 6 includes a threaded fastener 61, an elastic member 62 and a limiting member 63, the box 1 is provided with a threaded mounting hole 14, and the threaded fastener 61 is mounted in the threaded mounting hole 14; the elastic member 62 is located between the threaded fastener 61 and the shift shaft 51; the limiting piece 63 is located between the elastic piece 62 and the shift shaft 51, and the elastic piece 62 is used for pushing the limiting piece 63 to abut against the shift shaft 51.

When the multi-gear speed changing device is switched to a certain output state, one of the limiting ring grooves of the shifting shaft 51 is just positioned at the same height as the limiting piece 63, the elastic piece 62 pushes the limiting piece 63 into the limiting ring groove, and the limiting piece 63 is clamped in the limiting ring groove, so that the limiting function is realized; when the pushing force of the limiting piece 63 to the shift shaft 51 needs to be increased, the screwing depth of the threaded fastener 61 in the threaded mounting hole 14 is increased, so that the threaded fastener 61 is close to the shift shaft 51, the compression amount of the elastic piece 62 is increased, the elastic potential energy is increased, the pushing force of the limiting piece 63 to the shift shaft 51 is increased, when the pushing force of the limiting piece 63 to the shift shaft 51 needs to be reduced, the screwing depth of the threaded fastener 61 in the threaded mounting hole 14 is reduced, the threaded fastener 61 is far away from the shift shaft 51, the compression amount of the elastic piece 62 is reduced, the elastic potential energy is weakened, and the pushing force of the limiting piece 63 to the shift shaft 51 is reduced; when the shift shaft 51 is moved along the Z-axis direction, the limiting member 63 abuts against the outer wall of the shift shaft 51 due to the thrust action of the elastic member 62, so that the magnitude of the thrust of the elastic member 62 is adjusted, and the magnitude of friction between the limiting member 63 and the shift shaft 51 can be controlled, so that the service life is prolonged.

In the present embodiment, the screw mounting hole 14 communicates with the first limiting hole 11, and the central axis of the screw mounting hole 14 is perpendicular to the central axis of the first limiting hole 11.

Alternatively, the elastic member 62 is a straight spring, and the stopper 63 is a marble. The balls are abutted against the shift shaft 51, so that the shift shaft 51 is beneficial to movement adjustment, for example, when the multi-gear speed changing device is in a certain output state, the balls are abutted against a certain limit ring groove, if the multi-gear speed changing device is required to be switched to another output state, at this time, a user pulls or butts against the shift shaft 51 along the Z-axis direction, the shift shaft 51 applies radial thrust and axial friction force to the balls, the balls rotate around the circle center and retract towards one side of the threaded mounting hole 14, after the limit ring groove is separated from the balls, the outer wall of the shift shaft 51, which is not provided with the limit ring groove, is contacted with the balls, the user continuously pulls or pushes the shift shaft 51, the balls subjected to axial friction force continuously rotate, rolling friction is generated between the balls and the shift shaft 51, the friction force is small, the service life of the balls can be prolonged, when the next limit ring groove is aligned with the balls, the user holding the shift shaft 51 can feel that the balls are clamped into the limit ring groove by the user, and the user holds the balls in a prompt effect, so that the user stops pulling or pushing the shift shaft 51 in time; the straight barrel spring is utilized to limit the marble, so that the marble can be prevented from being separated from the straight barrel spring.

In the present embodiment, the output wheels are provided in three, the three output wheels are respectively the high-speed output wheel 42, the medium-speed output wheel 43 and the low-speed output wheel 44, the three shift wheels are provided in three, the three shift wheels are respectively the high-speed shift wheel 52, the medium-speed shift wheel 53 and the low-speed shift wheel 54, the three limit ring grooves are provided in three, and the three limit ring grooves are respectively the high-speed limit ring groove 511, the medium-speed limit ring groove 512 and the low-speed limit ring groove 513.

When the lock assembly 6 abuts against the high-speed limiting ring groove 511, the high-speed shift wheel 52 is engaged with the high-speed output wheel 42, and the multi-speed transmission is switched to the high-speed output state.

When the locking assembly 6 abuts against the middle speed limit ring groove 512, the middle speed shift wheel 53 is engaged with the middle speed output wheel 43, and the multi-speed transmission device is switched to the middle speed output state.

When the lock assembly 6 abuts against the low speed limit groove 513, the low speed shift wheel 54 is engaged with the low speed output wheel 44, and the multi-speed transmission is shifted to the low speed output state.

The diameters of the high speed shift wheel 52, the medium speed shift wheel 53 and the low speed shift wheel 54 decrease in order, and the diameters of the high speed output wheel 42, the medium speed output wheel 43 and the low speed output wheel 44 increase in order.

Optionally, a low speed limit groove 513 is located between the high speed limit groove 511 and the medium speed limit groove 512.

In other embodiments, the output wheels may be provided in two, or four, or five, or even more, and the corresponding shift wheels may be provided in two, or four, or five, or even more, to ensure that the number of output wheels and shift wheels is equal.

In this embodiment, the output shaft 41 comprises a multi-segment drive shaft. The high-speed output wheel 42 is fixedly connected with one of the transmission shafts, the medium-speed output wheel 43 is fixedly connected with one of the transmission shafts, the low-speed output wheel 44 is fixedly connected with one of the transmission shafts, and the three transmission shafts and the three output wheels are fixedly sleeved on the periphery of the other transmission shaft.

Alternatively, the medium speed shift wheel 53 is located between the high speed shift wheel 52 and the low speed shift wheel 54, and the medium speed output wheel 43 is located between the high speed output wheel 42 and the low speed output wheel 44.

Optionally, the worm gear assembly 3 includes a primary gear 31, the gear shifting assembly 5 further includes a secondary gear 55, the primary gear 31 is in driving connection with the secondary gear 55, and the secondary gear 55 is in driving connection with the high speed gear 52, the medium speed gear 53 and the low speed gear 54, respectively.

The primary gear 31 is provided coaxially with the worm wheel 32 and integrally therewith, and the primary gear 31 transmits power from the worm wheel 32 to the secondary gear 55, and the secondary gear 55 transmits power to the shift wheel.

In the present embodiment, the high-speed shift wheel 52, the secondary gear 55 and the medium-speed shift wheel 53 are integrally provided as a shift member, which is advantageous for power transmission and improves the assembly efficiency of the shift member at the shift shaft 51. The axial positioning of the gear shifting member can refer to the prior art, and this embodiment will not be described in detail.

When the high-speed shift wheel 52 is engaged with the high-speed output wheel 42, the insertion depth of the second limit post 12 is deepest, the part of the shift shaft 51 extending to the case 1 is smallest, at this time, the locking assembly 6 is abutted against the high-speed limit ring groove 511, at this time, the output rotation speed of the multi-speed transmission device is highest, when the shift shaft 51 is pulled toward the outside of the case 1, the length of the part of the shift shaft 51 extending to the case 1 is increased, the low-speed shift wheel 54 is engaged with the low-speed output wheel 44, at this time, the locking assembly 6 is abutted against the low-speed limit ring groove 513, at this time, the output rotation speed of the multi-speed transmission device is lowest, at this time, when the shift shaft 51 is pulled toward the outside of the case 1 continuously, the length of the part of the shift shaft 51 extending to the case 1 is increased to the longest, the medium-speed shift wheel 53 is engaged with the medium-speed output wheel 43, at this time, the locking assembly 6 is abutted against the medium-speed limit ring groove 512, at this time, the output rotation speed of the multi-speed transmission device is in a medium-speed state.

Optionally, the gear shifting assembly 5 further includes a transmission sleeve 56, the transmission sleeve 56 and the low-speed gear shifting wheel 54 are integrally arranged, the transmission sleeve 56 is sleeved on the circumference of the gear shifting shaft 51, one end of the transmission sleeve 56 away from the low-speed gear shifting wheel 54 extends into the inner wall of the gear shifting piece, and the transmission sleeve 56 is in transmission connection with the gear shifting piece. The axial positioning of the transmission sleeve 56 and the low speed adjustment wheel 54 can be referred to in the prior art, and the description of this embodiment is omitted.

The through hole of the shift block is set to be a polygonal through hole, and the outer wall of the end of the transmission sleeve 56 away from the low-speed shift wheel 54 is set to be a polygonal outer wall, and the polygonal outer wall is adapted to the polygonal through hole, thereby enabling power transmission.

Optionally, an injection nozzle 7 is further provided on the tank 1, and the lubricant is injected from the injection nozzle 7 into the interior of the tank 1.

Embodiment two:

the second embodiment provides a sprinkling irrigation apparatus, which includes an auxiliary spray gun, an impeller 8 and a multi-gear speed change device as in the first embodiment, the impeller 8 is fixedly installed on the worm assembly 2, and the impeller 8 is located at a water spraying port of the auxiliary spray gun, and the auxiliary spray gun sprays water to the impeller 8 so that the impeller can drive the worm assembly 2 to rotate.

Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. A multi-speed transmission comprising:

a case (1);

the worm assembly (2) is rotatably arranged on the box body (1), and the worm assembly (2) is used for being in transmission connection with the power input piece;

the worm gear assembly (3) is rotatably arranged on the box body (1), and the worm assembly (2) is in transmission connection with the worm gear assembly (3);

the output assembly (4) is rotatably mounted on the box body (1), the output assembly (4) comprises an output shaft (41) extending along the Z-axis direction and a plurality of output wheels which are arranged at intervals and fixedly sleeved on the periphery of the output shaft (41), and the diameters of the plurality of output wheels are different;

the gear shifting assembly (5) is installed in the box body (1), the gear shifting assembly (5) is respectively connected with the worm gear assembly (3) and the output assembly (4) in a transmission mode, the gear shifting assembly (5) comprises a gear shifting shaft (51) extending along the Z-axis direction and a plurality of gear shifting wheels which are arranged at intervals and sleeved on the periphery of the gear shifting shaft (51), the gear shifting shafts (51) are different in diameter, the gear shifting shafts are adjustably inserted into the box body (1) along the Z-axis direction, the multi-gear speed changing device is in various output states, and when the multi-gear speed changing device is switched to one of the output states, one of the gear shifting wheels is meshed with the corresponding output wheel.

2. The multi-gear speed change device according to claim 1, wherein a first limiting hole (11) is formed in a side wall of the box body (1), a second limiting column (12) is arranged on the inner wall of the box body (1) facing the first limiting hole (11), a second limiting hole (13) with a preset depth is formed in the second limiting column (12), the first limiting hole (11) and the second limiting hole (13) are coaxially arranged, and the shift shaft (51) is tightly inserted into the first limiting hole (11) and the second limiting hole (13).

3. The multi-speed transmission according to claim 1, further comprising:

the locking assembly (6) is arranged on the box body (1), a plurality of limiting ring grooves are formed in the periphery of the shifting shaft (51) at intervals along the Z-axis direction, and one shifting wheel is meshed and connected with the corresponding output wheel when the locking assembly (6) is in butt joint with the limiting ring grooves.

4. A multi-speed transmission according to claim 3, wherein the locking assembly (6) comprises:

a threaded fastener (61), wherein a threaded mounting hole (14) is formed in the box body (1), and the threaded fastener (61) is mounted in the threaded mounting hole (14);

an elastic member (62) located between the threaded fastener (61) and the shift shaft (51);

the limiting piece (63) is located between the elastic piece (62) and the shifting shaft (51), and the elastic piece (62) is used for pushing the limiting piece (63) to be abutted to the shifting shaft (51).

5. The multi-speed transmission according to claim 4, wherein the elastic member (62) is a straight tube spring and the stopper member (63) is a marble.

6. A multi-speed transmission according to claim 3, wherein the output wheels are three, three of which are respectively a high-speed output wheel (42), a medium-speed output wheel (43) and a low-speed output wheel (44), the shift wheels are three, three of which are respectively a high-speed shift wheel (52), a medium-speed shift wheel (53) and a low-speed shift wheel (54), and the limit ring grooves are three, and three of which are respectively a high-speed limit ring groove (511), a medium-speed limit ring groove (512) and a low-speed limit ring groove (513);

when the locking assembly (6) is abutted against the high-speed limiting ring groove (511), the high-speed gear wheel (52) is meshed with the high-speed output wheel (42), and the multi-gear speed change device is switched to a high-speed output state;

when the locking assembly (6) is abutted against the middle speed limit ring groove (512), the middle speed gear shifting wheel (53) is meshed with the middle speed output wheel (43), and the multi-gear speed changing device is switched to a middle speed output state;

when the locking assembly (6) is abutted against the low-speed limiting ring groove (513), the low-speed gear shifting wheel (54) is meshed with the low-speed output wheel (44), and the multi-gear speed changing device is switched to a low-speed output state.

7. The multi-speed transmission according to claim 6, characterized in that the medium speed shift wheel (53) is located between the high speed shift wheel (52) and the low speed shift wheel (54), and the medium speed output wheel (43) is located between the high speed output wheel (42) and the low speed output wheel (44).

8. The multi-speed transmission according to claim 7, wherein the worm gear assembly (3) comprises a primary gear (31), the shift assembly (5) further comprises a secondary gear (55), the primary gear (31) is in driving connection with the secondary gear (55), and the secondary gear (55) is in driving connection with the high speed shift wheel (52), the medium speed shift wheel (53) and the low speed shift wheel (54), respectively.

9. The multi-speed transmission according to claim 8, wherein the high-speed shift wheel (52), the secondary gear (55), and the medium-speed shift wheel (53) are integrally provided as a shift member.

10. The multi-speed transmission according to claim 9, wherein the shift assembly (5) further comprises a transmission sleeve (56), the transmission sleeve (56) is integrally arranged with the low-speed shift wheel (54), the transmission sleeve (56) is sleeved on the periphery of the shift shaft (51), one end of the transmission sleeve (56), which is far away from the low-speed shift wheel (54), extends into the inner wall of the shift member, and the transmission sleeve (56) is in transmission connection with the shift member.