Small speed reduction gearbox

Abstract

The utility model discloses a small speed reduction gearbox, which belongs to the technical field of mechanical transmission equipment and is characterized in that a driving groove of an input shaft is connected with a transmission belt of a driven groove of a fan driving shaft, power of the input shaft of the gearbox is directly utilized to drive a fan to rotate, an additional motor is not needed, energy consumption and cost are reduced, and on the other hand, start-stop impact of the motor is buffered. Gear system abrasion is reduced; the rotating speed of the cooling fan is synchronous with that of the input shaft, the heat dissipation intensity is automatically adjusted along with the load, and heat dissipation is enhanced when the load rises, the rotating speed of the input shaft rises and the rotating speed of the cooling fan rises; the forced convection air channel, the air inlet and the fan are pressurized, airflow penetrates through the gear set and the top heat dissipation holes to be exhausted, an efficient heat dissipation path is formed, and the problem that a traditional small speed reduction gearbox is poor in heat dissipation is solved.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission equipment technology, and more specifically it relates to a small gearbox for speed reduction. Background Technology

[0002] As industrial technology develops towards miniaturization and precision, the demand for gearboxes in small mechanical equipment is increasing day by day.

[0003] However, existing small gearboxes have many problems. In order to achieve miniaturization, their internal structure is compact, which makes it difficult to dissipate the heat generated by transmission components such as gears during operation. Excessive temperature will accelerate the aging of lubricating oil, reduce the lubrication effect, aggravate gear wear, and affect the service life and transmission accuracy of the gearbox. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a small gearbox that has the advantage of solving the problem of poor heat dissipation in traditional small gearboxes.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A small gearbox for speed reduction includes a first gearbox cover and a second gearbox cover connected to each other, and a transmission gear set and a motor disposed between the first gearbox cover and the second gearbox cover. The transmission gear set includes a worm gear, an input gear, a transition gear, a double gear, and an output gear.

[0007] The worm gear is fixedly sleeved on the motor shaft; the input gear includes a large-diameter input gear, a small-diameter input gear, and an input shaft coaxially and fixedly connected; the transition gear includes a large-diameter transition gear and a small-diameter transition gear coaxially and fixedly connected; the double gear includes a large-diameter double gear and a small-diameter double gear coaxially and fixedly connected; the output gear includes a large-diameter output gear and an output shaft coaxially and fixedly connected; the worm gear meshes with the large-diameter input gear, the small-diameter input gear meshes with the large-diameter transition gear, the small-diameter transition gear meshes with the large-diameter double gear, and the small-diameter double gear meshes with the large-diameter output gear;

[0008] The first gearbox cover has an air inlet, and a mounting cylinder is fixedly connected to the outside of the air inlet. The bottom inner wall of the mounting cylinder has a cross-shaped bracket. A cooling fan is rotatably connected to the side of the cross-shaped bracket facing the air inlet. A fan drive shaft is fixedly connected to the end face of the cooling fan facing the air inlet. The input shaft and the fan drive shaft are respectively provided with an active slot and a driven slot. A transmission belt that is compatible with each other is provided between the active slot and the driven slot. The top of both the first gearbox cover and the second gearbox cover is provided with several heat dissipation holes.

[0009] The advantages of this scheme are at least as follows: The transmission belt connects the active slot of the input shaft to the driven slot of the fan drive shaft, directly utilizing the power of the gearbox input shaft to drive the fan rotation, eliminating the need for an additional motor, thus reducing energy consumption and cost. Furthermore, it buffers the impact of motor start-up and shutdown, reducing wear on the gear system. The cooling fan speed is synchronized with the input shaft, and the cooling intensity automatically adjusts with the load; as the load increases, the input shaft speed increases, the cooling fan speed increases, and cooling is enhanced. The forced convection airflow duct, with air inlet, fan pressurization, airflow passing through the gear set, and exhaust through the top cooling holes, forms an efficient cooling path.

[0010] The present invention is further configured such that: a support bar is provided inside the air inlet, and a support circular hole for supporting the fan drive shaft is provided at the end of the support bar.

[0011] The advantages of this scheme are at least as follows: by setting support bars and support holes, the two ends of the support bars are fixed to the inner wall of the air inlet to form a portal frame structure, which resists the lateral tension of the transmission belt and avoids shaft sway.

[0012] The present invention is further configured such that: a bearing is provided between the supporting circular hole and the fan drive shaft, the inner ring of the bearing sleeve is sleeved on the fan drive shaft, and the outer ring is fixed to the inner wall of the supporting circular hole.

[0013] The advantages of this design are at least as follows: by incorporating bearings, friction and wear can be effectively reduced during rotation. The rolling of the rolling elements between the inner and outer rings significantly reduces the frictional resistance between the fan drive shaft and the supporting bore, thereby improving the fan's operating efficiency and lifespan.

[0014] The present invention is further configured such that: the outer end face of the mounting cylinder is provided with a detachable dust cover, and the dust cover is connected to the mounting cylinder by bolts.

[0015] The advantages of this solution are at least as follows: by setting up a dust cover, dust and dirt can be prevented from entering the gearbox; the dust cover is fixed with bolts, which can be quickly removed and installed.

[0016] The present invention is further configured such that the heat dissipation holes are arranged in an array on the top of the first and second gearbox covers, and the hole spacing is less than 5 mm.

[0017] The advantages of this scheme are at least as follows: the array distribution of heat dissipation holes can form a honeycomb convection channel, allowing hot air to diffuse evenly from the inside of the gearbox to the top, eliminating local high-temperature dead zones; the hole spacing of <5mm naturally forms a physical filter, blocking solid foreign objects with a diameter >3mm, reducing the risk of gear jamming.

[0018] The present invention is further configured such that: the transmission belt is a flexible transmission component, and the active groove and the driven groove are transmission groove structures that match the transmission belt.

[0019] The advantages of this solution are at least as follows: compared to the matching driving and driven groove structures, traditional rigid gear drives require more parts and more complex manufacturing processes. Flexible transmission belts, on the other hand, can achieve power transmission through a simple structure, reducing manufacturing costs and assembly difficulty.

[0020] In summary, this utility model has at least the following advantages:

[0021] 1. By setting support bars and support holes, the two ends of the support bars are fixed to the inner wall of the air inlet to form a portal frame structure, which resists the lateral tension of the transmission belt and avoids shaft sway.

[0022] 2. By incorporating bearings, friction and wear are effectively reduced during rotation. The rolling of the rolling elements between the inner and outer rings significantly reduces the frictional resistance between the fan drive shaft and the supporting bore, thereby improving the fan's operating efficiency and lifespan.

[0023] 3. By setting up a dust cover, dust and dirt can be prevented from entering the inside of the gearbox; the dust cover is fixed with bolts, which can be quickly removed and installed. Attached Figure Description

[0024] Figure 1 This is an exploded view of the first gearbox cover, the second gearbox cover, and the transmission gear set in this utility model.

[0025] Figure 2 This is an overall exploded view of a preferred embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of a preferred embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a preferred embodiment of the present invention from different perspectives;

[0028] Figure 5 This is a schematic diagram of the first tooth box cover of a preferred embodiment of the present invention;

[0029] Figure 6 for Figure 5 An enlarged schematic diagram of part A in the middle.

[0030] Reference numerals: 1. First gearbox cover; 2. Second gearbox cover; 3. Motor; 4. Worm gear; 5. Input gear; 501. Large diameter input gear; 502. Small diameter input gear; 503. Input shaft; 6. Transition gear; 601. Large diameter transition gear; 602. Small diameter transition gear; 7. Double gear; 701. Large diameter double gear; 702. Small diameter double gear; 8. Output gear; 801. Large diameter output gear; 802. Output shaft; 9. Air inlet; 10. Mounting cylinder; 11. Cross-shaped bracket; 12. Cooling fan; 13. Fan drive shaft; 14. Driving slot; 15. Driven slot; 16. Transmission belt; 17. Heat dissipation hole; 18. Support bar; 19. Bearing; 20. Dust cover. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0032] A type of small gearbox, such as Figure 1 As shown, it includes a first gearbox cover 1 and a second gearbox cover 2 that are connected to each other, as well as a transmission gear set and a motor 3 disposed between the first gearbox cover 1 and the second gearbox cover 2. The transmission gear set includes a worm gear 4, an input gear 5, a transition gear 6, a double gear 7 and an output gear 8.

[0033] Worm gear 4 is fixedly sleeved on the rotating shaft of motor 3; input gear 5 includes a large-diameter input gear 501, a small-diameter input gear 502 and an input shaft 503 coaxially fixedly connected; transition gear 6 includes a large-diameter transition gear 601 and a small-diameter transition gear 602 coaxially fixedly connected; double gear 7 includes a large-diameter double gear 701 and a small-diameter double gear 702 coaxially fixedly connected; output gear 8 includes a large-diameter output gear 801 and an output shaft 802 coaxially fixedly connected; worm gear 4 meshes with large-diameter input gear 501, small-diameter input gear 502 meshes with large-diameter transition gear 601, small-diameter transition gear 602 meshes with large-diameter double gear 701, and small-diameter double gear 702 meshes with large-diameter output gear 801;

[0034] An air inlet 9 is provided on the first gearbox cover 1. A mounting cylinder 10 is fixedly connected to the outside of the air inlet 9. A cross-shaped bracket 11 is provided on the bottom inner wall of the mounting cylinder 10. A cooling fan 12 is rotatably connected to the side of the cross-shaped bracket 11 facing the air inlet 9. A fan drive shaft 13 is fixedly connected to the end face of the cooling fan 12 facing the air inlet 9 (see reference). Figure 2 The input shaft 503 and the fan drive shaft 13 are respectively provided with an active slot 14 and a driven slot 15 (see reference). Figure 2 A drive belt 16 (see reference) is provided between the driving groove 14 and the driven groove 15 to be mutually adapted. Figure 2The first gearbox cover 1 and the second gearbox cover 2 are both provided with several heat dissipation holes 17 on their tops. The transmission belt 16 of the driven groove 15 of the fan drive shaft 13 is connected to the active groove 14 of the input shaft 503, so the fan is directly driven by the power of the gearbox input shaft 503, eliminating the need for an additional motor 3, reducing energy consumption and cost. On the other hand, it also buffers the start-stop impact of the motor 3 and reduces wear on the gear system. The speed of the cooling fan 12 is synchronized with the input shaft 503, and the heat dissipation intensity is automatically adjusted according to the load (increased load → increased speed of input shaft 503 → increased speed of cooling fan 12 → enhanced heat dissipation). Forced convection air duct: air inlet 9 → fan pressurization → airflow through the gear set → exhaust through the top heat dissipation holes 17, forming an efficient heat dissipation path.

[0035] like Figure 2 As shown, a support strip 18 is provided inside the air inlet 9 (reference). Figure 5 The support bar 18 has a support hole at its end for supporting the fan drive shaft 13. By setting the support bar 18 and the support hole, the two ends of the support bar 18 are fixed to the inner wall of the air inlet 9, forming a portal frame structure to resist the lateral tension of the transmission belt 16 and prevent the shaft system from wobbling.

[0036] like Figure 5 As shown, the supporting circular hole is connected to the fan drive shaft 13 (reference). Figure 6 Bearing 19 is provided between (reference) Figure 6 The inner ring of bearing 19 is fitted onto the fan drive shaft 13, while the outer ring is fixed to the inner wall of the support hole. By configuring bearing 19, friction and wear can be effectively reduced during rotation. The rolling of rolling elements (such as steel balls or rollers) between the inner and outer rings significantly reduces the frictional resistance between the fan drive shaft 13 and the support hole, thereby improving the fan's operating efficiency and lifespan.

[0037] like Figure 2 As shown, the outer end face of the mounting cylinder 10 is provided with a removable dust cover 20, which is connected to the mounting cylinder 10 by bolts. By providing the dust cover 20, dust and dirt can be prevented from entering the inside of the gearbox; the dust cover 20 is fixed by bolts, allowing for quick removal and installation.

[0038] like Figure 2 As shown, the heat dissipation holes 17 are arranged in an array on the top of the first gearbox cover 1 and the second gearbox cover 2, and the hole spacing is less than 5mm. The array distribution of the heat dissipation holes 17 can form a honeycomb convection channel, allowing the hot airflow to diffuse evenly from the inside of the gearbox to the top, eliminating local high temperature dead zones; the hole spacing of <5mm naturally forms a physical filter, blocking solid foreign objects (such as screws and debris) with a diameter >3mm, reducing the risk of gear jamming.

[0039] The transmission belt 16 is a flexible transmission component, and the driving groove 14 and driven groove 15 are transmission groove structures that match the transmission belt 16. Compared with the flexible transmission belt 16 and its matching driving groove 14 and driven groove 15, traditional rigid gear transmission requires more parts and more complex manufacturing processes. The flexible transmission belt 16 can achieve power transmission with a simple structure, reducing manufacturing costs and assembly difficulty.

[0040] The working process and beneficial effects of this utility model are as follows: The motor 3 built into the gearbox body → the input shaft 503 rotates → drives the transmission belt 16 through the active slot 14 → drives the driven slot 15 to rotate synchronously; the fan drive shaft 13 rotates → the cooling fan 12 runs at high speed. The fan rotation is directly driven by the power of the gearbox input shaft 503, eliminating the need for an additional motor 3, reducing energy consumption and cost, buffering the start-stop impact of the motor 3, and reducing wear on the gear system.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A small gearbox for speed reduction, comprising a first gearbox cover (1) and a second gearbox cover (2) connected to each other, and a transmission gear set and a motor (3) disposed between the first gearbox cover (1) and the second gearbox cover (2), wherein the transmission gear set comprises a worm gear (4), an input gear (5), a transition gear (6), a double gear (7) and an output gear (8); The worm gear (4) is fixedly sleeved on the rotating shaft of the motor (3); the input gear (5) includes a large-diameter input gear (501), a small-diameter input gear (502), and an input shaft (503) that are coaxially fixedly connected; the transition gear (6) includes a large-diameter transition gear (601) and a small-diameter transition gear (602) that are coaxially fixedly connected; the double gear (7) includes a large-diameter double gear (701) and a small-diameter double gear (702) that are coaxially fixedly connected; the output gear (8) includes a large-diameter output gear (801) and an output shaft (802) that are coaxially fixedly connected; the worm gear (4) meshes with the large-diameter input gear (501), the small-diameter input gear (502) meshes with the large-diameter transition gear (601), the small-diameter transition gear (602) meshes with the large-diameter double gear (701), and the small-diameter double gear (702) meshes with the large-diameter output gear (801); Its features are: An air inlet (9) is provided on the first gearbox cover (1). An installation cylinder (10) is fixedly connected to the outside of the air inlet (9). A cross-shaped bracket (11) is provided on the bottom inner wall of the installation cylinder (10). A cooling fan (12) is rotatably connected to the side of the cross-shaped bracket (11) facing the air inlet (9). A fan drive shaft (13) is fixedly connected to the end face of the cooling fan (12) facing the air inlet (9). An active groove (14) and a driven groove (15) are provided on the input shaft (503) and the fan drive shaft (13) respectively. A transmission belt (16) is provided between the active groove (14) and the driven groove (15). Several heat dissipation holes (17) are provided on the top of the first gearbox cover (1) and the second gearbox cover (2).

2. The gearbox for reducing speed according to claim 1, characterized in that: The air inlet (9) is provided with a support bar (18), and the end of the support bar (18) is provided with a support hole for supporting the fan drive shaft (13).

3. A small gearbox for speed reduction according to claim 2, characterized in that: A bearing (19) is provided between the support hole and the fan drive shaft (13). The inner ring of the bearing (19) is fitted onto the fan drive shaft (13), and the outer ring is fixed to the inner wall of the support hole.

4. A small gearbox for speed reduction according to claim 1, characterized in that: The outer end face of the mounting cylinder (10) is provided with a detachable dust cover (20), which is connected to the mounting cylinder (10) by bolts.

5. A small gearbox for speed reduction according to claim 1, characterized in that: The heat dissipation holes (17) are arranged in an array on the top of the first gearbox cover (1) and the second gearbox cover (2), and the hole spacing is less than 5 mm.

6. A small gearbox for speed reduction according to claim 1, characterized in that: The transmission belt (16) is a flexible transmission component, and the active groove (14) and driven groove (15) are transmission groove structures that match the transmission belt (16).

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