Pruning machine

Abstract

This utility model relates to a pruning machine, including a housing, a motor installed inside the housing, a fan driven by the motor to generate cooling airflow, and a transmission device connected to the motor. The transmission device includes a gearbox and a reduction gear set installed inside the gearbox. The gearbox includes an air inlet and an air outlet. The cooling airflow enters the gearbox through the air inlet, flows through the reduction gear set, and exits the gearbox through the air outlet. In this pruning machine, the cooling airflow flows into the gearbox to directly dissipate heat from the high-heat reduction gear set, resulting in high heat dissipation efficiency and preventing the lubricating oil inside the gearbox from solidifying at high temperatures for extended periods, thus avoiding impact on the service life of the reduction gear set.

Description

[Technical Field]

[0001] This utility model relates to the field of garden tool technology, and in particular to a pruning machine. [Background Technology]

[0002] A pruning machine is a common gardening tool that includes a motor, pruning blades, and a gearbox connecting the motor and the pruning blades. The motor drives the pruning blades to reciprocate through the gearbox, thereby cutting various shrubs, hedges, etc.

[0003] When a pruning machine is performing pruning operations, the motor rotates at high speed to drive the fan to rotate and generate a cooling airflow. The cooling airflow flows through the motor and gearbox to achieve heat dissipation. However, existing gearboxes are usually constructed as a closed shell isolated from the external environment. As a result, the cooling airflow can only flow through the outer surface of the gearbox, while the reduction gear set inside the gearbox cannot be effectively cooled.

[0004] Therefore, it is indeed necessary to provide an improved pruning machine to overcome the shortcomings of the existing technology. [Utility Model Content]

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hedge trimmer with good heat dissipation effect of reduction gear set.

[0006] The present invention solves the existing technical problems by adopting the following technical solution: A pruning machine, comprising: a housing, including a housing air inlet and a housing air outlet; a motor, installed inside the housing; a fan, driven by the motor to generate a cooling airflow that enters the housing through the housing air inlet and exits the housing through the housing air outlet; a transmission device, installed inside the housing and connected to the motor, the transmission device including a gearbox and a reduction gear set installed inside the gearbox; the gearbox including a gearbox air inlet and a gearbox air outlet, the cooling airflow entering the gearbox through the gearbox air inlet and flowing through the reduction gear set, and exiting the gearbox through the gearbox air outlet.

[0007] Furthermore, the gearbox also includes an upper end face and a lower end face that are disposed opposite to each other in the axial direction of the motor, the air inlet of the gearbox is disposed on the lower end face, and the air outlet of the gearbox is disposed on the upper end face.

[0008] Furthermore, the reduction gear set includes planetary gears and an internal gear ring meshing with the planetary gears, and the gearbox also includes a support portion supporting the internal gear ring, the support portion at least partially surrounding the internal gear ring in the circumferential direction.

[0009] Furthermore, the support portion is disposed on the lower end face of the gearbox, and in the radial direction of the motor, the air inlet of the gearbox is disposed on the outside of the support portion.

[0010] Furthermore, in the axial direction of the motor, the motor is positioned above the transmission device, and the cooling airflow flows sequentially through the transmission device and the motor.

[0011] Furthermore, at least a portion of the housing air inlet is located below the box air inlet.

[0012] Furthermore, the pruning machine also includes a first stop extending from the inner wall of the housing toward the gearbox, wherein the distance between the end of the first stop away from the inner wall and the outer surface of the gearbox is no greater than 2 mm.

[0013] Furthermore, the first stop is disposed above the air inlet of the housing, and in the axial direction of the motor, the distance between the first stop and the air inlet of the housing is not greater than half of the axial length of the gearbox.

[0014] Furthermore, the pruning machine also includes a second stop extending from the inner wall of the housing toward the motor, wherein the distance between the end of the second stop away from the inner wall and the outer surface of the motor is no greater than 2 mm.

[0015] Furthermore, the second stop is disposed above the air outlet of the housing, and in the axial direction of the motor, the distance between the second stop and the air outlet of the housing is not greater than one-third of the axial length of the motor.

[0016] Compared with the prior art, the present invention has the following advantages: The pruning machine includes a housing, a motor installed in the housing, a fan driven by the motor to generate cooling airflow, and a transmission device connected to the motor. The transmission device includes a gearbox and a reduction gear set installed in the gearbox. The gearbox includes a gearbox inlet and a gearbox outlet. The cooling airflow enters the gearbox through the gearbox inlet and flows through the reduction gear set before leaving the gearbox through the gearbox outlet. In this way, the cooling airflow flows into the interior of the gearbox to directly dissipate heat from the high-heat reduction gear set, resulting in high heat dissipation efficiency and preventing the lubricating oil in the gearbox from solidifying at a high temperature for a long time, which would affect the service life of the reduction gear set. [Attached Image Description]

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of the pruning machine in a preferred embodiment of this utility model;

[0019] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the pruning machine shown;

[0020] Figure 3 yes Figure 2 A magnified view of part A in the middle.

[0021] Meaning of the reference numerals in the diagram:

[0022] Pruning machine 100, housing 1

[0023] Main housing section 11; Housing air inlet 110

[0024] Air outlet 120 in the housing; power housing section 12

[0025] Grip part 13 Joint part 14

[0026] Inner wall 15, trimming blade 2

[0027] Transmission device 3 Gearbox 31

[0028] Air inlet 311 Air outlet 312

[0029] Upper end face 313 Lower end face 314

[0030] Support part 315, reduction gear set 32

[0031] Planetary gear 321, internal gear ring 322

[0032] 4 motors, 5 battery packs

[0033] Fan 6 First stop 7

[0034] Second stop 8

Detailed Implementation Methods

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. In the description of this specification, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] Please see Figures 1 to 3 The pruning machine 100 shown is an embodiment of the present invention, including a housing 1, pruning blades 2, transmission device 3, motor 4 and battery pack 5.

[0039] The housing 1 includes a main housing portion 11, a power housing portion 12, a grip portion 13, and a connecting portion 14. Specifically, the main housing portion 11 carries the pruning blade 2, one end of which is fixedly mounted to the main housing portion 11, and the other end extends forward from the main housing portion 11 out of the housing 1 for pruning operations. The power housing portion 12 is connected to or integrally formed with the rear of the main housing portion 11. The motor 4 and the transmission device 3 are at least partially housed inside the power housing portion 12. The transmission device 3 is connected between the motor 4 and the pruning blade 2, and the rotational motion of the motor 4 is transmitted to the pruning blade 2 through the transmission device 3 to drive the pruning blade 2 to move. The grip portion 13 is connected to or integrally formed with the rear of the power housing portion 12, and the user carries the pruning machine 100 for mobile operations through the grip portion 13. The connecting portion 14 is connected to or integrally formed with the rear of the grip portion 13, and the battery pack 5 is used to power the pruning machine 100 and is detachably installed in the connecting portion 14.

[0040] The housing 1 includes a housing air inlet 110 and a housing air outlet 120. A motor 4 is connected to a fan 6, which is driven by the motor 4 to generate a cooling airflow that enters the housing 1 through the housing air inlet 110 and exits through the housing air outlet 120. Specifically, in the axial direction of the motor 4, the motor 4 is positioned above the transmission device 3, and the housing air outlet 120 is positioned above the housing air inlet 110. After entering the housing 1 through the housing air inlet 110, the cooling airflow flows successively through the transmission device 3 and the motor 4, and then exits the housing 1 through the housing air outlet 120. Thus, in this embodiment, the cooling airflow flows successively through the transmission device 3 and the motor 4 to respectively dissipate heat from the transmission device 3 and the motor 4. The cooling duct structure is simple and the cooling efficiency is high.

[0041] The transmission device 3 is installed inside the housing 1 and connected to the motor 4. The transmission device 3 includes a gearbox 31 and a reduction gear set 32 ​​installed inside the gearbox 31. Specifically, the gearbox 31 includes a housing air inlet 311 and a housing air outlet 312. The aforementioned cooling airflow enters the gearbox 31 through the housing air inlet 311, flows through the reduction gear set 32, and then exits the gearbox 31 through the housing air outlet 312. In this way, the cooling airflow flows into the interior of the gearbox 31 to directly dissipate heat from the high-heat reduction gear set 32, and prevents the lubricating oil inside the gearbox 31 from solidifying at a high temperature for a long time, which would affect the service life of the reduction gear set 32.

[0042] The gearbox 31 also includes an upper end face 313 and a lower end face 314 disposed opposite to each other in the axial direction of the motor 4. The gearbox air inlet 311 is disposed on the lower end face 314, and the gearbox air outlet 312 is disposed on the upper end face 313. In this embodiment, the flow direction of the cooling airflow between the housing air inlet 110 and the housing air outlet 120 is from bottom to top in the axial direction of the motor 4, and the flow direction of the cooling airflow inside the gearbox 31 is the same. Thus, not only is the cooling air duct structure through which the cooling airflow flows simple, but the cooling airflow also moves stably in the bottom-up direction inside the housing 1, without scattering everywhere, resulting in smooth airflow and good heat dissipation effect.

[0043] In an optional embodiment of this utility model, at least part of the housing air inlet 110 is located below the housing air inlet 311. In this way, after the heat dissipation airflow enters the housing 1 through the housing air inlet 110, it moves directly from bottom to top along the axial direction of the motor 4 and enters the gearbox 31 through the housing air inlet 311, thereby further preventing the heat dissipation airflow from scattering around inside the housing 1 and improving the heat dissipation effect.

[0044] The reduction gear set 32 ​​includes a planetary gear 321 and an internal gear ring 322 meshing with the planetary gear 321. The gearbox 31 also includes a support portion 315 supporting the internal gear ring 322. The support portion 315 at least partially surrounds the internal gear ring 322 in the circumferential direction. Specifically, the support portion 315 is disposed on the lower end face 314 of the gearbox 31, and in the radial direction of the motor 4, the air inlet 311 of the gearbox is disposed on the outside of the support portion 315.

[0045] Thus, on the one hand, the heat generated by the high-speed rotating planetary gear 321 is transferred to the meshing internal gear ring 322, causing the internal gear ring 322 to be in a high-temperature state. In this embodiment, by setting the air inlet 311 of the housing on the outside of the support portion 315 that supports the internal gear ring 322, the cooling airflow flowing into the gearbox 31 from the air inlet 311 directly passes through the outer surface of the internal gear ring 322 to dissipate heat from the internal gear ring 322, resulting in good heat dissipation effect. On the other hand, by setting the air inlet 311 of the housing on the outside of the support portion 315, and by having the support portion 315 at least partially surround the internal gear ring 322 in the circumferential direction, the cooling airflow only flows on the outer surface of the internal gear ring 322 and does not flow to the planetary gear 321 set inside the internal gear ring 322, thereby preventing the lubricating oil set inside the internal gear ring 322 from being carried into the cooling airflow and affecting the normal operation of the motor 4.

[0046] The pruning machine 100 also includes a first stop 7 extending from the inner wall 15 of the housing 1 toward the gearbox 31, wherein the distance between the end of the first stop 7 away from the inner wall 15 and the outer surface of the gearbox 31 is no more than 2 mm. Specifically, a first stop 7 is provided between the inner wall 15 of the housing 1 and the gearbox 31. One end of the first stop 7 is integrally formed or connected to the inner wall 15 of the housing 1, and the other end extends towards the outer surface of the gearbox 31 until the distance between the first stop 7 and the outer surface of the gearbox 31 is no more than 2mm. In this way, by reducing the distance between the first stop 7 and the outer surface of the gearbox 31, the negative pressure in the area of ​​the housing 1 above the first stop 7 and outside the gearbox 31 is small when the motor 4 drives the fan 6 to rotate. After the heat dissipation airflow flows into the housing 1 through the air inlet 110, only a small part will flow to the outer surface of the gearbox 31, so that the heat dissipation airflow is concentrated in the gearbox 31 to concentrate the heat dissipation of the high-heat internal gear ring 322, thereby improving the heat dissipation effect of the transmission device 3.

[0047] It should be noted that, in an optional embodiment of this utility model, the end of the first stop 7 away from the inner wall 15 can also be connected to the outer surface of the gearbox 31. In this way, on the one hand, the flow direction of the heat dissipation airflow flowing into the housing 1 from the housing air inlet 110 can be directly guided by the first stop 7 so that the heat dissipation airflow can only flow into the interior of the gearbox 31, thereby improving the heat dissipation effect; on the other hand, the first stop 7 can support and limit the gearbox 31 in the radial direction of the motor 4, thereby improving the structural stability of the gearbox 31 installation.

[0048] Furthermore, the first stop 7 is positioned above the air inlet 311 of the gearbox, and the distance between the first stop 7 and the air inlet 311 in the axial direction of the motor 4 is no greater than half the axial length of the gearbox 31. The axial length of the gearbox 31 is the distance between the upper end face 313 and the lower end face 314 of the gearbox 31. Thus, in this embodiment, by positioning the first stop 7 above the air inlet 311 of the gearbox 31 and placing it close to the air inlet 311, the cooling airflow flowing into the housing 1 from the housing air inlet 110 flows more rapidly into the interior of the gearbox 31, further improving the heat dissipation effect.

[0049] The pruning machine 100 also includes a second stop 8 extending from the inner wall 15 of the housing 1 toward the direction of the motor 4. The distance between the end of the second stop 8 away from the inner wall 15 and the outer surface of the motor 4 is no more than 2 mm. Specifically, a second stop 8 is provided between the inner wall 15 of the housing 1 and the motor 4. One end of the second stop 8 is integrally formed or connected to the inner wall 15 of the housing 1, and the other end extends toward the outer surface of the motor 4 until the distance between it and the outer surface of the motor 4 is no more than 2 mm. In this way, by reducing the distance between the second stop 8 and the outer surface of the motor 4, the negative pressure in the area of ​​the housing 1 above the second stop 8 and outside the motor 4 is small when the motor 4 drives the fan 6 to rotate. When the cooling airflow flows out of the gearbox 31 from the air outlet 312 of the housing, only a small portion will flow to the outer surface of the motor 4, thereby concentrating the cooling airflow into the interior of the motor 4 to concentrate the cooling of the motor stator and rotor, and improving the cooling effect of the motor 4.

[0050] It should be noted that, in an optional embodiment of this utility model, the end of the second stop 8 away from the inner wall 15 can also be connected to the outer surface of the motor 4. In this way, on the one hand, the second stop 8 can directly guide the flow direction of the cooling airflow flowing out of the gearbox 31 from the air outlet 312 of the housing so that the cooling airflow can only flow into the interior of the motor 4, thereby improving the cooling effect; on the other hand, the second stop 8 can support and limit the motor 4 in the radial direction, thereby improving the structural stability of the motor 4 installation.

[0051] Furthermore, the second stop 8 is positioned above the air outlet 312 of the gearbox 31, and the distance between the second stop 8 and the air outlet 312 in the axial direction of the motor 4 is no greater than one-third of the axial length of the motor 4, where the axial length of the motor 4 is the distance between the upper and lower end faces of the motor 4. Thus, in this embodiment, by positioning the second stop 8 above and close to the air outlet 312 of the gearbox 31, the cooling airflow exiting the gearbox 31 from the air outlet 312 flows more rapidly into the interior of the motor 4, further improving the heat dissipation effect.

[0052] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternative solutions to the pruning machine of this utility model can be found without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. A pruning machine, comprising: The housing includes the housing air inlet and the housing air outlet; The motor is installed inside the housing; A fan, driven by the motor, generates a cooling airflow that enters the housing through the housing inlet and exits the housing through the housing outlet. A transmission device is installed inside the housing and connected to the motor. The transmission device includes a gearbox and a reduction gear set installed inside the gearbox. The gearbox is characterized in that: the gearbox includes a gearbox air inlet and a gearbox air outlet, the cooling airflow enters the gearbox through the gearbox air inlet and flows through the reduction gear set, and then leaves the gearbox through the gearbox air outlet.

2. The pruning machine according to claim 1, characterized in that: The gearbox also includes an upper end face and a lower end face that are disposed opposite to each other in the axial direction of the motor. The air inlet of the gearbox is disposed on the lower end face, and the air outlet of the gearbox is disposed on the upper end face.

3. The pruning machine according to claim 2, characterized in that: The reduction gear set includes planetary gears and an internal gear ring meshing with the planetary gears. The gearbox also includes a support portion that carries the internal gear ring, and the support portion at least partially surrounds the internal gear ring in the circumferential direction.

4. The pruning machine according to claim 3, characterized in that: The support portion is disposed on the lower end face of the gearbox, and in the radial direction of the motor, the air inlet of the gearbox is disposed on the outside of the support portion.

5. The pruning machine according to claim 1, characterized in that: In the axial direction of the motor, the motor is positioned above the transmission device, and the cooling airflow flows sequentially through the transmission device and the motor.

6. The pruning machine according to claim 5, characterized in that: At least part of the housing air inlet is located below the box air inlet.

7. The pruning machine according to claim 1, characterized in that: The pruning machine also includes a first stop extending from the inner wall of the housing toward the gearbox, wherein the distance between the end of the first stop away from the inner wall and the outer surface of the gearbox is no greater than 2 mm.

8. The pruning machine according to claim 7, characterized in that: The first stop is positioned above the air inlet of the housing, and the distance between the first stop and the air inlet of the housing in the axial direction of the motor is no greater than half the axial length of the gearbox.

9. The pruning machine according to claim 1, characterized in that: The pruning machine also includes a second stop extending from the inner wall of the housing toward the motor, wherein the distance between the end of the second stop away from the inner wall and the outer surface of the motor is no more than 2 mm.

10. The pruning machine according to claim 9, characterized in that: The second stop is disposed above the air outlet of the housing, and in the axial direction of the motor, the distance between the second stop and the air outlet of the housing is not greater than one-third of the axial length of the motor.

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