deceleration device

Abstract

The utility model relates to a kind of speed reducer, including shell, worm wheel, sun gear, planetary gear, fixed core wheel and output shaft, the worm wheel is hollow ring, and the outer wall of worm wheel is provided with the outer tooth for connecting power source, the inner wall of worm wheel is provided with inner tooth;The planetary gear is placed on positioning shaft, the planetary gear rotates with positioning shaft as rotating center, the planetary gear and inner tooth engage;The sun gear is rotatably arranged in the cavity of shell, and sun gear and planetary gear engage;The output shaft is connected with sun gear, and the worm wheel is driven output shaft rotation by planetary gear, sun gear. Simplified planetary reduction mechanism of single set of planetary gear cooperation sun gear is adopted, not only reduce the number of planetary gear, but also can greatly compress radial and axial dimension under the condition of keeping equivalent reduction ratio, help the miniaturization design of overall equipment.

Description

Technical Field

[0001] This utility model relates to a speed reduction device. Background Technology

[0002] Speed ​​reduction devices are widely used in various transmission mechanisms, especially in small drive devices such as nail guns, screwdrivers, and power tools, where they convert high-speed, low-torque power output into low-speed, high-torque output. Existing speed reduction devices mostly employ planetary gear structures to achieve multi-stage reduction, but their design still has certain shortcomings.

[0003] In traditional speed reduction mechanisms, multiple planetary gears are typically arranged around the sun gear to achieve balanced force transmission. However, due to the large number of planetary gears and the high requirements for machining accuracy and meshing clearance, even a slight misalignment of a planetary gear during assembly or use can easily lead to jamming of the entire mechanism or accelerated wear, and in severe cases, even speed reducer failure. Furthermore, to accommodate multiple planetary gears and maintain a proper meshing relationship, existing structures often result in increased housing dimensions, which is detrimental to the miniaturization and lightweight design of speed reduction devices. Utility Model Content

[0004] The purpose of this invention is to provide a small-sized deceleration device that will not deviate or jam.

[0005] The purpose of this utility model is achieved as follows: A speed reduction device includes a housing, a worm gear, a sun gear, a planetary gear, a stator gear, and an output shaft. The worm gear is a hollow ring, with external teeth on its outer wall for connecting to a power source and internal teeth on its inner wall. The worm gear is rotatably mounted inside the housing cavity; The housing is provided with a positioning shaft at intervals in the inner cavity corresponding to the worm gear. The diameter of the centering wheel is larger than the diameter of the planetary gear. The centering wheel is sleeved on the positioning shaft, and the outer wall of the centering wheel is close to the inner wall of the worm gear and located below the internal teeth. The planetary gear is mounted on the positioning shaft and rotates around the positioning shaft as the rotation center. The planetary gear meshes with the internal teeth. The sun gear is rotatably mounted inside the housing cavity, and the sun gear meshes with the planetary gears. The output shaft is connected to the sun gear, and the worm gear drives the output shaft to rotate through the planetary gears and the sun gear.

[0006] The simplified planetary reduction mechanism, which uses a single set of planetary gears in conjunction with a sun gear, not only reduces the number of planetary gears but also significantly reduces the radial and axial dimensions while maintaining the same reduction ratio, thus contributing to the miniaturization of the overall equipment design.

[0007] The centering wheel has a larger diameter than the planetary gear and is closely attached to the inner wall of the worm gear, thereby achieving radial constraint on the planetary gear. This ensures that the planetary gear does not shift during operation and maintains a constant meshing clearance, effectively avoiding jamming caused by reduced tooth backlash.

[0008] The multi-stage meshing and synchronous operation of the worm gear, planetary gear, and sun gear ensures that the input torque is smoothly transmitted to the output shaft after reasonable distribution, enabling the output of stable high torque and improving transmission efficiency and load-bearing capacity.

[0009] The objective of this utility model can also be achieved by the following technical measures: Furthermore, the housing includes a first receiving cavity and a second receiving cavity for accommodating the worm gear, the first receiving cavity and the second receiving cavity being connected; The worm gear is rotatably disposed in the first accommodating cavity, and part of the external teeth of the worm gear enter the second accommodating cavity; The bottom wall of the first accommodating cavity is provided with the positioning shaft at intervals corresponding to the inner cavity of the worm gear.

[0010] Some of the external teeth of the worm gear extend into the second accommodating cavity and mesh with the worm. No additional transmission intermediate parts are required, which realizes the compact combination of the two-stage transmission mechanism in the cavity. This effectively shortens the axial length of the reduction device and helps to make the whole machine miniaturized.

[0011] The beneficial effects of this utility model are as follows: This invention employs a simplified planetary reduction mechanism with a single set of planetary gears and a sun gear. This not only reduces the number of planetary gears but also significantly compresses the radial and axial dimensions while maintaining the same reduction ratio, thus contributing to the miniaturization of the overall equipment.

[0012] In this invention, the diameter of the centering wheel is larger than that of the planetary gear and is closely attached to the inner wall of the worm gear, thereby achieving radial constraint on the planetary gear and ensuring that the planetary gear does not deviate during operation and maintains a constant meshing clearance, thus effectively avoiding jamming failure caused by reduced tooth backlash.

[0013] In this invention, some of the external teeth of the worm gear extend into the second accommodating cavity and mesh with the worm, eliminating the need for additional transmission intermediate parts. This achieves a compact combination of the two-stage transmission mechanism within the cavity, effectively shortening the axial length of the reduction device and contributing to the miniaturization of the entire machine. Attached Figure Description

[0014] Figure 1 This is a diagram of a nail gun.

[0015] Figure 2 This is a top view of a nail gun.

[0016] Figure 3This is a schematic diagram of a nail gun (the push rod extends forward, the clamping component is in the clamping state, and the second spring is compressed).

[0017] Figure 4 This is a 3D view of a nail gun (the push rod extends forward, the clamping component is in the clamping state, and the second spring is compressed).

[0018] Figure 5 This is a schematic diagram of a nail gun (the push rod retracts backward, the clamping component opens, and the second spring returns to its original position).

[0019] Figure 6 This is a 3D view of a nail gun (the push rod extends forward, the clamping component is in the clamping state, and the second spring is compressed).

[0020] Figure 7 This is a schematic diagram of the swing arm (the second spring is compressed).

[0021] Figure 8 This is a schematic diagram of the swing arm (with the second spring resetting).

[0022] Figure 9 A perspective view (excluding the housing) showing the connection of the drive unit, worm gear, and reduction gear.

[0023] Figure 10 A schematic diagram showing the connection of the drive unit, worm gear, and reduction gear (excluding the housing).

[0024] Figure 11 This is a cross-sectional view of the speed reduction device.

[0025] Figure 12 This is an exploded view of the drive unit, worm gear, and reduction gear.

[0026] Figure 13 for Figure 3 AA sectional view.

[0027] Figure 14 This is a schematic diagram illustrating how the rotation of the adjusting screw causes the lower and upper clutches to disengage.

[0028] Figure 15 This is a schematic diagram showing the separation of the upper and lower clutches.

[0029] Figure 16 A schematic diagram showing the connection between the lower and upper clutches, which is used to adjust the rotation of the screw and the reset of the first spring.

[0030] Figure 17 This is a schematic diagram showing the connection between the upper and lower clutches.

[0031] Figure 18 This is a diagram of a nail gun (with part of the gun body removed).

[0032] Figure 19 This is a schematic diagram showing the connection between the slider and the slide rail.

[0033] Figure 20 This is a schematic diagram showing the connection between the push rod, guide block, slider, and slide rail. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments: Implementation examples, in conjunction with Figures 1 to 20 As shown, a nail gun includes a gun body 1, a drive device, a deceleration device 3, a clutch device 4, a swing arm 5, a push rod 6, and a clamping component 7. The clamping component 7 is located at the front of the gun body 1, and the drive device is located at the rear of the gun body 1. The push rod 6 is slidably disposed inside the gun body 1. The front end of the push rod 6 is connected to the clamping component 7. The push rod 6 is provided with a guide block 8, and the guide block 8 has a guide groove 81. The deceleration device 3 is located on one side of the gun body 1, the swing arm 5 is located on the other side of the gun body 1, and the output end of the drive device is connected to the input end of the deceleration device 3. The clutch device 4 includes an upper clutch 41, a lower clutch and a controller 43. The lower clutch is connected to the output end of the deceleration device 3. The upper clutch 41 is connected to one end of the swing arm 5. The other end of the swing arm 5 is provided with a sliding part 51, which extends into the guide groove 81. The controller 43 is mounted on the gun body 1, and the controller 43 controls the connection or disengagement of the upper clutch 41 and the lower clutch; When the upper clutch 41 and the lower clutch are connected, the drive device reduces the speed through the reduction device 3 and then drives the swing arm 5 to rotate through the clutch device 4, causing the sliding part 51 to slide in the guide groove 81 and push the push rod 6 to slide back and forth, so that the push rod 6 drives the clamping part 7 to open or close. Furthermore, the driving device includes a motor 2 and a worm gear 21. The motor 2 is arranged at the rear of the gun body 1 in an inclined manner. The output end of the motor 2 is connected to the worm gear 21, and the worm gear 21 meshes with the input end of the reduction device 3.

[0035] Furthermore, the tail end of the motor 2 is inclined upward toward the gun body 1, and the worm gear 21 is inclined downward toward the gun body 1.

[0036] Furthermore, the reduction device 3 includes a housing 31, a worm gear 32, a sun gear 33, a planetary gear 34, a centering wheel 35, and an output shaft 36. The worm gear 32 is a hollow ring body, with external teeth 321 on the outer wall and internal teeth 322 on the inner wall. The worm gear 32 is rotatably disposed in the inner cavity of the housing 31, and the external teeth 321 mesh with the worm 21; The housing 31 is mounted on the gun body 1. The housing 31 is provided with a positioning shaft 37 at intervals corresponding to the inner cavity of the worm gear 32. The diameter of the core wheel 35 is larger than the diameter of the planetary gear 34. The core wheel 35 is sleeved on the positioning shaft 37. The outer wall of the core wheel 35 is in close contact with the inner wall of the worm gear 32 and is located outside the internal teeth 322. The planetary gear 34 is sleeved on the positioning shaft 37, and the planetary gear 34 rotates about the positioning shaft 37 as the rotation center. The planetary gear 34 meshes with the internal teeth 322. The sun gear 33 is rotatably disposed in the inner cavity of the housing 31. The sun gear 33 meshes with the planetary gear 34. The output shaft 36 is connected to the sun gear 33. The worm gear 32 drives the output shaft 36 to rotate through the planetary gear 34 and the sun gear 33.

[0037] Furthermore, the housing 31 includes a first accommodating cavity 311 and a second accommodating cavity 312, which are connected. The worm 21 is rotatably disposed in the second accommodating cavity 312, and the worm wheel 32 is rotatably disposed in the first accommodating cavity 311. Part of the external teeth 321 of the worm wheel 32 enter the second accommodating cavity 312 and mesh with the worm 21. The bottom wall of the first accommodating cavity 311 is provided with the positioning shaft 37 at intervals corresponding to the inner cavity of the worm gear 32.

[0038] Furthermore, the controller 43 includes a movable plate 431, an adjusting bolt 432, a pressure block 433 and a first spring 434, the lower clutch is a splined lower clutch 42, the output shaft 36 is a splined shaft, and the splined shaft extends through the gun body 1 toward the upper clutch 41; The splined sleeve lower clutch 42 is provided with a slot 421. The splined sleeve lower clutch 42 is sleeved on the splined shaft. The first spring 434 is sleeved on the splined shaft. One end of the first spring 434 abuts against the splined shaft, and the other end of the first spring 434 abuts against the splined sleeve lower clutch 42. The first spring 434 constitutes the reset mechanism of the splined sleeve lower clutch 42. The movable plate 431 has a first through hole 4311. The movable plate 431 is movably mounted on the gun body 1. The end of the movable plate 431 is inserted into the slot 421 of the splined clutch 42. The adjusting bolt 432 passes through the first through hole 4311 and connects to the gun body 1. The pressure block 433 is sleeved on the adjusting bolt 432. One end of the pressure block 433 abuts against the head of the adjusting bolt 432, and the other end of the pressure block 433 abuts against the movable plate 431. The adjustment bolt 432 rotates and drives the pressure block 433 to move, thereby driving the lower clutch 42 of the spline sleeve to move, so that the lower clutch 42 of the spline sleeve and the upper clutch 41 are connected or separated.

[0039] Furthermore, the swing arm 5 also includes an arm body 52, a second spring 53, and a sliding block 54. The arm body 52 has a sliding groove 521. The second spring 53 and the sliding block 54 are placed in the sliding groove 521. One end of the second spring 53 abuts against the inner wall of the sliding groove 521, and the other end of the second spring 53 abuts against the sliding block 54. The second spring 53 constitutes the reset mechanism of the sliding block 54. The lower end of the sliding block 54 extends outward to form the sliding part 51. The output end of the clutch device 4 is connected to the arm body 52.

[0040] Furthermore, one side of the arm body 52 has a connection port 522 for connecting the output shaft, and the other side of the arm body 52 has the sliding groove 521.

[0041] Furthermore, it also includes a cover 523 and a bolt 524. The cover 523 is disposed on the surface of the arm body 52 to cover the sliding groove 521, and the bolt 524 passes through the cover 523 to lock the arm body 52.

[0042] Furthermore, the guide groove 81 is a vertical guide groove, and the direction of the guide groove 81 is perpendicular to the moving direction of the push rod 6.

[0043] Furthermore, it also includes a guide device 9, which includes a slide rail 91 and a slider 92. The slide rail 91 is disposed on the gun body 1, and the slider 92 sits on the slide rail 91 in a sliding manner. The slider 92 is connected to the guide block 8.

[0044] Furthermore, it also includes a tension wheel assembly 10. The clamping component 7 includes a first clamping member 71 and a second clamping member 72. The first clamping member 71 and the second clamping member 72 are respectively hinged to the gun body 1. The front part of the first clamping member 71 and the front part of the second clamping member 72 form a nail clamping opening 73. A nail pushing channel 74 is formed between the rear part of the first clamping member 71 and the rear part of the second clamping member 72. The nail pushing channel 74 and the nail clamping opening 73 are connected. The tension wheel assembly 10 is placed in the nail pushing channel 74 and connected to the push rod 6.

[0045] Furthermore, it also includes an automatic nail feeding device 20. The gun body 1 has a nail inlet at the position corresponding to the nail pushing channel 74. The automatic nail feeding device 20 is installed on the gun body 1, and the nail feeding outlet of the automatic nail feeding device 20 is connected to the nail inlet.

[0046] Nail gun working principle When the motor 2 drives the worm 21 to rotate, the worm 21 meshes with the worm wheel 32 in the reduction gear 3, and is further reduced in speed by the planetary gear 34 and the sun gear 33, and is connected to the swing arm 5 through the upper clutch 41 and the lower clutch. When the swing arm 5 rotates, the sliding block 54 at its lower end slides up and down in the vertical guide groove of the guide block 8. This vertical motion is converted into a horizontal thrust by the guide block 8, which pushes the push rod 6 back and forth, thereby driving the clamping component 7 at the front end to open and close, clamping or releasing the C-shaped nail bundle. At the moment of clamping open, the automatic nail feeding device 20 pushes the next nail into the channel to complete continuous nailing.

[0047] The reason for the small size of the nail gun The motor 2 is installed at an angle at the rear of the gun body 1. The worm 21 directly meshes with the worm wheel 32, eliminating the horizontal and axial occupancy of traditional horizontal or multi-stage spur and helical gears. The reduction device 3 adopts a set of planetary and sun gears 33, and the worm 21 and worm wheel 32 are respectively placed in the double-connected cavity of the housing 31. This optimizes the three-dimensional spatial layout and compresses the radial and axial dimensions, realizing the miniaturization design of the nail gun.

[0048] The anti-jamming principle of the deceleration device 3 The diameter of the centering wheel 35 is larger than that of the planetary gear 34. The centering wheel 35 is in close contact with the inner wall of the worm gear 32 to achieve radial constraint on the planetary gear 34. The planetary gear 34 maintains a preset clearance with the internal gear and the sun gear 33, allowing thermal expansion and vibration to shift without changing the meshing clearance, thus avoiding jamming due to eccentricity or thermal expansion causing the tooth clearance to become smaller.

[0049] The reason why the nail gun is easy to repair via clutch device 4 Users can disengage or engage the clutch device 4 without additional tools by rotating the adjusting bolt 432 on the outside of the gun body 1. Once disengaged, the swing arm 5 and push rod 6 can be quickly removed for inspection or replacement without disassembling the reduction gear 3 or motor 2, greatly shortening maintenance time and making operation simpler and more intuitive.

[0050] The principle of preventing motor 2 from stalling When the push rod 6 encounters resistance while moving forward, the sliding block 54 compresses the second spring 53, and the swing arm 5 continues to rotate instead of rigidly driving the push rod 6, thereby eliminating the overload torque and preventing the motor 2 from experiencing instantaneous overcurrent or overheating due to stall, thus achieving mechanical overload protection for the motor 2.

[0051] The principle of horizontal linear motion of the push rod 6. The guide block 8 on the push rod 6 is connected to the slider 92. The slider 92 slides along the length of the slide rail 91, thereby ensuring that the push rod 6 moves only in a predetermined horizontal direction, eliminating lateral sway and jamming, and improving the accuracy and stability of linear motion.

Claims

1. A speed reduction device, characterized in that: It includes a housing, a worm gear, a sun gear, planetary gears, a centering wheel, and an output shaft. The worm gear is a hollow ring body, with external teeth on the outer wall for connecting to a power source and internal teeth on the inner wall. The worm gear is rotatably mounted inside the housing cavity; The housing is provided with a positioning shaft at intervals in the inner cavity corresponding to the worm gear. The diameter of the centering wheel is larger than the diameter of the planetary gear. The centering wheel is sleeved on the positioning shaft, and the outer wall of the centering wheel is close to the inner wall of the worm gear and located below the internal teeth. The planetary gear is mounted on the positioning shaft and rotates around the positioning shaft as the rotation center. The planetary gear meshes with the internal teeth. The sun gear is rotatably mounted inside the housing cavity, and the sun gear meshes with the planetary gears. The output shaft is connected to the sun gear, and the worm gear drives the output shaft to rotate through the planetary gears and the sun gear.

2. The speed reduction device according to claim 1, characterized in that: The housing includes a first receiving cavity and a second receiving cavity for accommodating the worm gear, the first receiving cavity and the second receiving cavity being connected; The worm gear is rotatably disposed in the first accommodating cavity, and part of the external teeth of the worm gear enter the second accommodating cavity; The bottom wall of the first accommodating cavity is provided with the positioning shaft at intervals corresponding to the inner cavity of the worm gear.

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