Speed reducer and nail gun

Abstract

The utility model provides a speed reducer and a nail gun, the speed reducer comprises a cylindrical shell, a reduction gear set, an input shaft, an output shaft, a limiting disc with a gear hole, a direction stopping pin and a direction stopping driving piece, and the one-way rotation of the output shaft can be realized through the matching of the direction stopping pin and the gear hole. The limiting disc is in a cover shape and is arranged at one end of the shell, namely, the limiting disc is also used as an end cover of the speed reducer, so that the whole structure of the speed reducer is simpler. Particularly, the stop pin is arranged in a containing groove in the output shaft and moves in the containing groove, namely, the stop pin is arranged on the inner ring of the limiting disc, the space outside the limiting disc in the radial direction does not need to be occupied, the space inside the output shaft is utilized by movement of the stop pin, and therefore the hole diameter of the gear hole can be set to be small, and the gear can be prevented from being damaged. In addition, the distance between the output shaft and the limiting disc can be set to be very small, so that the overall size of the reverse rotation limiting structure in the speed reducer is greatly reduced, and the reverse rotation limiting structure can be used in the nail gun with the portable requirement and the handheld operation requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of nail guns, and in particular relates to a speed reducer and a nail gun. Background Art

[0002] A nail gun is a fastening tool commonly used in the fields of construction, furniture assembly, etc. One type of nail gun uses one or more springs as energy storage components, and a piston and a firing pin are arranged at one end of the spring, so that the spring provides kinetic energy for firing the nail, and a motor is used to drive the cam to rotate, so that the protrusion on the cam pushes the piston to move toward the spring direction to compress the spring and store energy. In such a nail gun, when the energy storage is completed, the spring is fully compressed and the piston is located at the predetermined highest energy storage position. However, at this time, the piston is still in contact with the protrusion on the cam. Under the action of the spring, the piston applies a force to the protrusion on the cam in the direction of nailing. Therefore, if the reverse rotation of the cam is not restricted, when the energy storage is about to be completed and when the energy storage is completed, the cam will be pushed to rotate in the reverse direction due to the large spring force, which will bring many problems, including insufficient energy storage and affecting the nailing force, possible misfiring and causing safety problems, and possible damage to the motor. Therefore, it is necessary to set a mechanism to limit or prevent the reverse rotation of the cam.

[0003] At present, the above-mentioned nail guns usually use one-way bearings to prevent the cam from rotating in the opposite direction, but the cost of one-way bearings is relatively high, which makes the nail guns of the above-mentioned structure not cost-effective compared with nail guns of other structures. Although there are other reverse limiting mechanisms in the prior art, such as the commonly used ratchet mechanism, it is difficult to apply them to nail guns. Taking the ratchet mechanism as an example, it usually includes a disc, a ratchet installed in the middle of the disc and connected to the rotating shaft, and a pawl installed on one side of the ratchet and cooperating with the teeth on the outer periphery of the ratchet. Since the pawl is arranged outside the ratchet in the radial direction and the pawl also needs space to rotate, the overall size of the ratchet mechanism is relatively large. As a tool with the requirements of portability and handheld operation, the nail gun has relatively strict restrictions on the overall size, weight, size of each part, and weight balance of each part, and it is impossible to install a ratchet mechanism of larger size in the gun body.

[0004] Therefore, in order to make the nail gun of the above structure have cost advantages and maintain its portable handheld characteristics, a reverse rotation limiting mechanism that can effectively achieve reverse rotation limiting and has a smaller size is needed. Utility Model Content

[0005] The utility model is designed to solve the above problems, and aims to provide a reducer and a corresponding nail gun whose size is significantly smaller than that of a ratchet mechanism and can effectively realize the reverse limiting function. The utility model adopts the following technical solutions:

[0006] The utility model provides a speed reducer, which is arranged in a nail gun with a rotating component and a rotating driver. The speed reducer has the following technical features, and comprises: a shell, which is in a cylindrical shape; an input shaft, which is connected to the rotating driver and rotates under the drive of the rotating driver; a limiting disk, which is in a cover shape, which is arranged on one end of the shell, and has a gear hole in the middle; an output shaft, which passes through the gear hole and is coaxially arranged with the gear hole, and has a receiving groove extending along its radial direction, and the receiving groove corresponds to the axial position of the gear hole; a stop pin, which is arranged in the receiving groove and can move along the extending direction thereof, one end of which is an outer end portion located outside the receiving groove, and is used to cooperate with the gear hole to realize the unidirectional rotation of the output shaft; a stop driving member, which is arranged in the receiving groove; and a reduction gear set, which is arranged in the shell, and is used to cooperate with the input shaft and the output shaft to realize the reduced speed output.

[0007] The reducer provided by the utility model may also have such technical features, wherein the inner periphery of the outer shell has an inner gear ring, the outer shell and the reduction gear set constitute a multi-stage planetary gear set, the multi-stage planetary gear set includes multi-stage gears, and the output shaft has: a mounting disk portion, which is disc-shaped and has multiple output shaft mounting holes, and is connected to the last stage gear in the multi-stage gears through a connecting piece; and a rotating shaft column portion, which is coaxially arranged with the mounting disk portion, and the accommodating groove is arranged in the middle of the rotating shaft column portion.

[0008] The reducer provided by the utility model may also have such technical features, which also includes: a bearing, which is cylindrical, mounted on the shaft column and located between the limiting disk and the mounting disk, wherein one end of the outer shell is annular, one axial end of the bearing is embedded in the limiting disk, and the other axial end is embedded in one end of the outer shell.

[0009] The reducer provided by the utility model may also have such technical features, wherein the outer periphery of the gear hole has a plurality of limit teeth, and a limit groove is formed between two adjacent limit teeth, and the limit groove has a first side surface and a second side surface parallel to the axial direction of the gear hole, and the outer end portion of the stop pin has: a stop mating surface, which is parallel to the radial direction of the output shaft, and is used to abut against the first side surface when the output shaft is subjected to a reverse driving force to prevent the output shaft from rotating in the opposite direction; and a rotating mating surface, which is inclined relative to the radial direction of the output shaft, and is used to abut against the second side surface when the output shaft is subjected to a forward driving force, so as to press the stop pin toward the accommodating groove, so that the output shaft can rotate in the forward direction.

[0010] The reducer provided by the utility model may also have such technical features, wherein the first side surface is parallel to the radial direction, the inclination angle of the second side surface relative to the corresponding first side surface is 30° to 45°, and the inclination angle of the rotating mating surface relative to the radial direction is 30° to 80°.

[0011] The reducer provided by the utility model may also have such a technical feature, wherein the first side surface and the second side surface are both inclined relative to the radial direction, and relative to the first radial direction of the output shaft passing through the intersection of the first side surface and the second side surface, the first side surface and the second side surface are respectively inclined to both sides, the inclination angle of the first side surface relative to the first radial direction is 5°~20°, the inclination angle of the second side surface relative to the first radial direction is 30°~45°, and the inclination angle of the rotating mating surface relative to the radial direction is 30°~80°.

[0012] The reducer provided by the utility model may also have such technical features, wherein the first side surface and the second side surface are both inclined relative to the radial direction, and relative to the first radial direction of the output shaft passing through the intersection of the first side surface and the second side surface, the first side surface and the second side surface are inclined to the same side, the inclination angle of the first side surface relative to the first radial direction is 5° to 20°, the inclination angle of the second side surface relative to the first radial direction is 30° to 45°, and the inclination angle of the rotating mating surface relative to the radial direction is 30° to 80°.

[0013] The reducer provided by the utility model may also have such a technical feature, wherein the first side surface and the second side surface are both parallel to the radial direction, and the inclination angle of the rotating mating surface relative to the radial direction is 30° to 80°.

[0014] The reducer provided by the utility model may also have such a technical feature, wherein the stop pin is columnar, and its side surface includes a cylindrical surface and a plane, the cylindrical surface is the stop mating surface, and the cross-sectional shape of the accommodating groove matches the stop pin.

[0015] The reducer provided by the utility model may also have such technical features, wherein the stop pin includes: a metal part, made of wear-resistant metal material, in a columnar shape, one end of which has a plane inclined relative to its axial direction, and one side surface of the metal part is the stop mating surface; and a noise reduction layer, made of wear-resistant and impact-resistant modified material, arranged on the plane of the metal part, and the outer surface of the noise reduction layer is the rotating mating surface.

[0016] The reducer provided by the utility model may also have such a technical feature, wherein the stop driving member is an elastic member, one end of which abuts against the side wall of the accommodating groove, and the other end abuts against the stop pin, and the elastic member is any one of a spring, a metal sheet strip with one or more bending portions, a columnar rubber part, and a columnar rubber-plastic part.

[0017] The utility model provides a nail gun, which has the following technical features: an elastic component, used for providing kinetic energy for nail shooting; a rotating component, used for compressing the elastic component and storing energy by rotating; a rotating driver, used for driving the rotating component to rotate; and the above-mentioned reducer, used for reducing speed and increasing torque on the output of the rotating driver, and making the rotating component rotate in one direction.

[0018] Function and effect of utility model

[0019] According to the reducer and nail gun provided by the utility model, the reducer includes a cylindrical housing, a reduction gear set, an input shaft and an output shaft, so that the reduction gear set can cooperate with the input shaft and the output shaft to achieve deceleration and torque-increasing output; further, the reducer also includes a limiting disk with a gear hole, a stop pin arranged in a receiving groove on the output shaft, and a stop driving member, so that the output shaft can also be rotated in one direction by cooperating with the stop pin and the gear hole. Among them, the limiting disk is in the shape of a cover and is arranged on one end of the housing, that is, it is used to achieve reverse restriction and is also used as a reducer end cover, making the overall structure of the reducer more streamlined. In particular, the stop pin is arranged in the receiving groove on the output shaft and moves in the groove, that is, the stop pin is arranged on the inner ring of the limiting disk, and does not need to occupy the radially outer space of the limiting disk, and the movement of the stop pin utilizes the space inside the output shaft, so the aperture of the gear hole can be set smaller, and the spacing between the output shaft and the limiting disk can also be set very small, so compared with the traditional ratchet assembly, the overall size of the reverse limiting structure in the reducer of the utility model is greatly reduced, the size of the reducer of the utility model is close to the size of the existing reducer, and it can also effectively realize the function of unidirectional rotation, and can be well applied to nail guns with portable needs and handheld operation needs. In addition, the reverse limiting structure is relatively simple, the components are easy to process, and the cost is lower than that of the existing one-way bearings, which is conducive to making the nail gun have further cost advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a side view of the structure of the nail gun in the first embodiment of the utility model;

[0021] Figure 2 It is a three-dimensional diagram of the driving unit in the first embodiment of the utility model;

[0022] Figure 3 It is a three-dimensional diagram of the pushing member in the first embodiment of the utility model;

[0023] Figure 4 It is a three-dimensional diagram of the pushing member in the first embodiment of the utility model at different angles;

[0024] Figure 5 This is a structural diagram of the cooperation between the pushing component and the energy storage firing unit in the first embodiment of the utility model;

[0025] Figure 6 It is a three-dimensional diagram of the reducer in the first embodiment of the utility model;

[0026] Figure 7 This is a structural exploded view of the reducer in the first embodiment of the utility model;

[0027] Figure 8 is a cross-sectional view of the reducer in the first embodiment of the utility model;

[0028] Fig. 9 It is a three-dimensional diagram of the output shaft of the reducer in the first embodiment of the utility model;

[0029] Fig.10 It is a cross-sectional view of the output shaft of the reducer in the first embodiment of the utility model;

[0030] Fig.11 It is a three-dimensional diagram of the limiting disk in the first embodiment of the utility model;

[0031] Fig.12 It is a three-dimensional diagram of different angles of the limiting disk in the first embodiment of the utility model;

[0032] Fig.13 It is an orthographic projection diagram of the limiting disk in the first embodiment of the utility model;

[0033] Fig.14 yes Fig.13 An enlarged view of the portion within the middle frame A;

[0034] Fig.15 It is a three-dimensional diagram of the stop pin in the first embodiment of the utility model;

[0035] Fig.16 It is a side view of the stop pin in the first embodiment of the utility model;

[0036] Fig.17 It is a cross-sectional view of the stop pin in the first embodiment of the utility model;

[0037] Fig.18 It is a cross-sectional view of the reverse limiting mechanism in the first embodiment of the present utility model in the use state;

[0038] Fig.19 It is a three-dimensional diagram of the stop pin in the second embodiment of the utility model;

[0039] Fig. 20 It is an orthographic projection diagram of the stop pin in the second embodiment of the utility model;

[0040] Fig.21 It is a three-dimensional diagram of the stop pin in the third embodiment of the utility model;

[0041] Fig. 22 It is an orthographic projection diagram of the reverse limiting mechanism in the third embodiment of the present utility model in the use state;

[0042] Fig.23 It is an orthographic projection diagram of the limiting disk in the first modification of the utility model;

[0043] Fig.24 It is an orthographic projection diagram of the limiting disk in the second modification of the utility model;

[0044] Fig.25 It is an orthographic projection diagram of the limiting disk in the third modification of the utility model;

[0045] Fig.26 It is a three-dimensional diagram of the stop driving member in the fourth modification of the utility model.

[0046] Reference numerals:

[0047] Nail gun 1000; drive unit 100A; reducer 100; reverse limiting mechanism 10; reducer output shaft 11; shaft mounting plate 111; shaft mounting hole 1111; circular shallow groove 1112; centering groove 1113; shaft column 112; receiving groove 1121; first spring limiting groove 1122; driving surface 1123; shaft end 113; first annular groove 114; second annular groove 115; limiting plate 12; main body cover 121; gear hole 1211; limiting tooth 1212; limiting groove 1213; first side surface 1213a; second side surface 1213b; arc bottom surface 1213c; clearance gap 1214; mounting block 122; outer end surface 122a; limiting plate mounting hole 1221; stop pin 13; stop pin body 131; first plane 131a; second plane 131b; first arc surface 131c; second arc surface 131d; second spring limiting groove 1311; matching portion 132; third plane 132a; fourth plane 132b; third arc surface 132c; fourth arc surface 132d; outer end surface 132e; Noise reduction layer 133; outer surface 133a; cylindrical surface 13a; plane 13b; stop driving member 14; bending portion 141; bearing 15; reducer housing 20; housing upper end portion 21; housing main body 22; housing limit surface 221; inner gear ring 222; reducer input shaft 30; reduction gear set 40; first-stage gear 41; first-stage toothed disc 42; second-stage gear 43; second-stage toothed disc 44; third-stage gear 45; connecting pin 46; energy storage firing unit 200; guide limit rod 210; energy storage spring 220; piston 2 30; first push portion 231; second push portion 232; firing pin 240; gun nozzle unit 300; nail magazine unit 400; nail gun housing 500; upper body portion 510; lower body portion 520; handle portion 530; columnar portion 540; rotating component 600; first push member 610; second push member 620; pushing component 630; disc portion 631; component mounting groove 6311; shaft matching hole 6312; arm portion 632; protrusion 633; ​​motor assembly 700; motor 710; motor end cover 720. DETAILED DESCRIPTION

[0048] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the reducer and nail gun of the present invention are specifically described below in conjunction with embodiments and drawings.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] <Example 1>

[0051] Figure 1 It is a side view of part of the structure of the nail gun in this embodiment. In order to show the internal structure of the nail gun, part of the shell structure is omitted in the figure.

[0052] like Figure 1 As shown, the nail gun 1000 includes a nail gun housing 500, a driving unit 100A, an energy storage firing unit 200, a gun nozzle unit 300, and a nail magazine unit 400. The driving unit 100 is used to drive the energy storage firing unit 200 to store energy, and then the energy storage firing unit 200 fires the nails at the gun nozzle unit 300 by releasing the stored energy. The nail magazine unit 400 is used to continuously supply nails to the gun nozzle unit 300.

[0053] Except for the driving unit 100A, the other units may adopt the structure in the prior art, for example, the corresponding structure disclosed in CN117733794A, so they are not described in detail. Only the structural parts related to the driving unit 100 are described below.

[0054] The energy storage firing unit 200 includes a guide limit rod 210, one or more energy storage springs 220, a piston 230, and a firing pin 240. The energy storage spring 220 is sleeved on the guide limit rod 210, one end of which abuts against the annular limit plate portion of the guide limit rod 210 at one end of the gun tail, and the other end of the energy storage spring 220 abuts against the piston 230. The piston 230 has a sleeve hole in the middle, through which it is sleeved on the guide limit rod 210 and can move along the axial direction thereof.

[0055] The nail gun housing 500 is generally in the shape of a square ring, and the gun nozzle unit 300 and the nail magazine unit 400 are installed on one side of the nail gun housing 500. The housing 500 includes an upper main body portion 510, a lower main body portion 520, and a handle portion 530 and a columnar portion 540 connected therebetween. Corresponding cavities are formed in these four portions, and the four cavities are connected in sequence as shown in the figure. The upper main body portion 510 is used to accommodate the energy storage firing unit 200, the lower main body portion 520 is used to accommodate the power switch and circuit board, etc., the handle portion 530 is mainly used for the user to hold and is provided with a trigger, etc., and the columnar portion 540 is used to accommodate the drive unit 100. It can be seen that the cavity space inside the columnar portion 540 is very limited, especially the inner diameter is small.

[0056] Figure 2 is a three-dimensional diagram of the driving unit in this embodiment.

[0057] like Figure 2 As shown, the driving unit 100A includes a reducer 100 , a rotating component 600 , and a motor assembly 700 .

[0058] The rotating component 600 includes a pushing member 630 , a first pushing member 610 , and a second pushing member 620 .

[0059] Figure 3 is a three-dimensional diagram of the pushing member in this embodiment, Figure 4 It is a stereoscopic view of the pushing component at different angles in this embodiment.

[0060] like Figure 3 and Figure 4 As shown, the pushing member 630 is a special-shaped disc-shaped member, which includes a disc portion 631 and two arm portions 632 formed in one piece. The disc portion 631 is disc-shaped (flat cylindrical), and the middle portion has a circular member installation groove 6311 and a rotating shaft matching hole 6312 located at the bottom of the member installation groove 6311 and passing through. The inner wall of the rotating shaft matching hole 6312 has two relative planes and two relative arc surfaces, which are used to match the rotating shaft of the corresponding structure. The two arm portions 632 extend from the side of the disc portion 631 along the radial direction of the disc portion 631, and the angle between the extension directions of the two arm portions 632 is an obtuse angle, and each arm portion 632 is roughly in the shape of a rounded trapezoidal plate. Each arm portion 632 is provided with a mounting hole, and the first pusher 610 and the second pusher 620 are respectively mounted on the two arm portions 632 through corresponding pins. The first pushing member 610 and the second pushing member 620 are both cylindrical members, and their axial directions are perpendicular to the surface direction of the pushing component 630 , wherein the axial height of the second pushing member 620 is greater than that of the first pushing member 610 .

[0061] In addition, the notch of the component mounting groove 6311 is located on one surface of the disc portion 631, and a shallow disc-shaped protrusion 633 is formed in the middle of the other surface of the disc portion 631, so that the disc portion 631 at the shaft mating hole 6312 has sufficient thickness, that is, the shaft mating hole 6312 has sufficient axial length.

[0062] In an alternative solution, the pushing member 630 may also be in the shape of a disk or a blunt-angled V-shaped plate.

[0063] Figure 5 It is a structural diagram of the cooperation between the pushing component and the energy storage firing unit in this embodiment.

[0064] like Figure 5 As shown, the pushing member 630 is arranged on one side of the piston 230 (the lower side in the figure), and the piston 230 has a main body and a first push portion 231 and a second push portion 232 extending from the main body toward one side of the pushing member 21. The second push portion 232 is in the shape of a hollow plate, extending from one side of the main body of the piston 230 toward the direction of the gun nozzle, and its surface direction is roughly parallel to the surface direction of the pushing member 630. The first push portion 231 is in the shape of a plate, extending from one side of the main body of the piston 230 roughly perpendicular to the surface direction of the second push portion 232, and its extension length is relatively short.

[0065] The first pusher 610 is used to cooperate with the first push portion 231. When the rotating component 600 rotates in a predetermined direction, the first pusher 610 moves to contact with the first push portion 231 and pushes the first push portion 231, so that the piston 230 moves toward the direction of the energy storage spring 220, thereby performing the first stage of compression energy storage. In addition, the height of the first pusher 610 is less than the extension length of the first push portion 231, so it will not contact the second push portion 232 when pushing the first push portion 231. Subsequently, as the rotating component 600 continues to rotate, the first pusher 610 is disengaged from the first push portion 231, and the second pusher 620 is in contact with the second push portion 232 and pushes the second push portion 232, so that the piston 230 further moves toward the direction of the energy storage spring 220, thereby performing the second stage of compression energy storage.

[0066] Figure 1The state shown in the figure is that the two-stage compression energy storage is completed. The piston 230 is located at the predetermined highest energy storage position. It can be seen that the second push portion 232 of the piston 230 is still in contact with the second push member 620. Under the action of the energy storage spring 220, the piston 230 applies a driving force along the nail-out direction to the second push member 620. At this time, the connecting line direction of the second push member 620 and the rotation center of the pushing member 630 is often inconsistent with the nail-out direction, and may be inclined relative to the nail-out direction. Even if the above connecting line direction is consistent with the nail-out direction, since the second push member 620 is cylindrical and the force-bearing surface is very small, this state is also an unstable state under the force state. Therefore, the driving force will try to drive the rotating component 600 to rotate in the opposite direction, causing the piston 230 to move toward the direction of the gun mouth (i.e., the energy storage is not in place) and even cause the nail to be fired by mistake, so it is necessary to limit the reverse rotation of the rotating component 600. In this embodiment, the purpose is achieved by the reducer 100.

[0067] Figure 6 is a three-dimensional diagram of the reducer in this embodiment, Figure 7 is a structural exploded view of the reducer in this embodiment, Figure 8 It is a cross-sectional view of the reducer in this embodiment.

[0068] like Figures 6 to 8 As shown, the reducer 100 includes a reverse rotation limiting mechanism 10 , a reducer housing 20 , a reducer input shaft 30 , and a reduction gear set 40 .

[0069] The reverse rotation limiting mechanism 10 includes a reducer output shaft 11 , a limiting plate 12 (reducer end cover), a stop pin 13 , a stop driving member 14 and a bearing 15 .

[0070] Fig. 9 is a stereoscopic diagram of the output shaft of the reducer in this embodiment, Fig.10 It is a cross-sectional view of the output shaft of the reducer in this embodiment.

[0071] like Fig. 9 and Fig.10 As shown, the reducer output shaft 11 includes a shaft mounting disc portion 111 , a shaft column portion 112 and a shaft end portion 113 that are integrally formed and coaxially arranged.

[0072] The rotating shaft mounting plate portion 111 is in the shape of a disk as a whole, and a plurality of through rotating shaft mounting holes 1111 (four in this embodiment) are evenly distributed along the circumference of the edge portion of the rotating shaft mounting plate portion 111, which are used to mount the output shaft 11 of the reducer on the rotating drive mechanism through fasteners, and the rotating drive mechanism can be, for example, a motor. A circular shallow groove 1112 and a centering groove 1113 are formed in the middle of one surface of the rotating shaft mounting plate portion 111 (the surface not connected to the rotating shaft column portion 112). The centering groove 1113 is arranged in the middle of the groove bottom of the circular shallow groove 1112, and the groove bottom of the centering groove 1113 is conical, and the cone is coaxial with the output shaft 11 of the reducer.

[0073] The shaft column 112 is generally cylindrical in shape, extending from the middle of the other surface of the shaft mounting plate 111 perpendicular to the surface direction of the shaft mounting plate 111, and is coaxially arranged with the shaft mounting plate 111. A receiving groove 1121 for receiving the stop pin 13 is provided in the middle of the shaft column 112 in the axial direction. The extending direction of the receiving groove 1121 is the radial direction of the shaft column 112, and its extending length is approximately 3 / 4 of the diameter of the shaft column 112. The notch of the receiving groove 1121 is located on the side of the shaft column 112, that is, a waist groove; the cross section of the receiving groove 1121 in its extending direction is a rounded rectangular shape, and the length direction of the cross section is perpendicular to the axial direction of the shaft column 112, and the length is less than half of the diameter of the shaft column 112. The bottom of the receiving groove 1121 has a first spring limiting groove 1122, which is a shallow circular groove, and its diameter is smaller than the length and width of the receiving groove 1121. In addition, the side surface of the rotating shaft column 112 close to the rotating shaft end 113 also has two shallow notches, and two driving surfaces 1123 are formed on the side surface of the end, and the two driving surfaces 1123 are both plane and parallel to each other, and are located on both sides of the rotating shaft column 112 in the radial direction. The length direction of the driving surface 1123 is the axial direction of the rotating shaft column 112, and the length of the driving surface 1123 is less than half the length of the rotating shaft column 112.

[0074] The shaft end 113 is generally cylindrical in shape and has a diameter smaller than that of the shaft column 112. Its axial length is also much smaller than that of the shaft column 112. The edge of the outer end of the shaft end 113 is chamfered. The shaft end 113 and the upper end of the shaft column 112 (i.e., the end with the driving surface 1123) are used to cooperate with the installation of the rotating component.

[0075] In addition, a first annular groove 114 is formed between the shaft column 112 and the shaft mounting plate 111, and the circumferential cross section of the first annular groove 114 is approximately trapezoidal. A second annular groove 115 is formed between the shaft column 112 and the shaft end 113, and the circumferential cross section of the second annular groove 115 is also approximately trapezoidal.

[0076] Fig.11is a three-dimensional diagram of the limiting disk in this embodiment, Fig.12 : is a stereogram of the limiting disk at different angles in this embodiment, Fig.13 It is an orthographic projection diagram of the limiting disk in this embodiment.

[0077] like Figures 11 to 13 As shown, the limiting plate 12 includes a main body cover portion 121 and a plurality of mounting block portions 122 which are integrally formed.

[0078] The main body cover 121 is generally in the shape of a circular cover, and has a through gear hole 1211 in the middle of its top surface. The minimum diameter of the gear hole 1211 is larger than the outer diameter of the shaft column 112. The edge of the gear hole 1211 has a plurality of limiting teeth 1212 arranged in sequence along a circumference, and a limiting groove 1213 is formed between two adjacent limiting teeth 1212, which are used to cooperate with the stop pin 13 to achieve unidirectional rotation. The shape and size of each limiting tooth 1212 are the same and match the shape and size of the outer end of the stop pin 13, and the pitch between two adjacent limiting teeth 1212 is also the same. In this embodiment, a total of eighteen limiting teeth 1212 and corresponding eighteen limiting grooves 1213 are provided.

[0079] Fig.14 yes Fig.13 An enlarged view of the portion within frame A.

[0080] like Fig.14 As shown, in this embodiment, each limiting tooth 1212 is a helical tooth, and all the limiting teeth 1212 are inclined along the same circumferential direction, which is the working rotation direction of the reducer output shaft 11 when in use.

[0081] Seen from the axial direction of the limiting disk 12, the cross-sectional shape of the limiting teeth 1212 is roughly a trapezoid with rounded corners, and the short side of the trapezoid faces the center of the limiting disk 12. Seen from the axial direction of the limiting disk 12, the cross-sectional shape of each limiting groove 1213 is roughly a triangle with rounded corners, and the limiting groove 1213 has a first side surface 1213a and a second side surface 1213b and an arc bottom surface 1213c connected between the two side surfaces, and the two side surfaces are parallel to the axial direction of the limiting disk 12, wherein the plane where the first side surface 1213a is located passes through the central axis 12A of the limiting disk 12, and the angle between the second side surface 1213b and the first side surface 1213a is an acute angle, and the angle of the angle is 30° to 45°. In this embodiment, the angle of the angle is about 45°.

[0082] It can be understood that the first side surface 1213a and the second side surface 1213b are also two side surfaces (tooth surfaces) of the limiting tooth 1212. The outer end surface of the limiting tooth 1212 (ie, the end surface facing the central axis of the limiting disk 12) is substantially perpendicular to the radial direction of the limiting disk 12.

[0083] The mounting block 122 further extends outward from the side of the main body cover 121, and its extension direction is the radial direction of the main body cover 121. The mounting block 122 is roughly in the shape of a rectangular block with rounded corners, and each mounting block 122 is provided with a through limiting disk mounting hole 1221, and the through direction of the limiting disk mounting hole 1221 is the axial direction of the limiting disk 12. The connection position between the mounting block 122 and the side of the main body cover 121 is in an arc shape. In addition, in this embodiment, the outer end face 122a of the mounting block 122 is perpendicular to the axial direction of the limiting disk 12, and the outer end face 122a has a smaller curvature. The upper edge of the main body cover 121 also has a plurality of clearance notches 1214, which are respectively located beside each mounting block 122, and the clearance notches 1214 are arc-shaped notches, so that the limiting disk mounting hole 1221 can be set closer to the main body cover 121.

[0084] Fig.15 : is a three-dimensional diagram of the stop pin in this embodiment, Fig.16 is a side view of the stop pin in this embodiment, Fig.17 It is a cross-sectional view of the stop pin in this embodiment.

[0085] like Figures 15 to 17 As shown, the stop pin 13 includes a stop pin body portion 131 and a matching portion 132 that are integrally formed.

[0086] The main body 131 of the stop pin is in a columnar shape, and its axial cross section has two parallel sides and two arc-shaped sides protruding outwards, so the four side surfaces of the main body 131 of the stop pin are respectively a first plane 131a, a second plane 131b, a first arc surface 131c and a second arc surface 131d, and these four side surfaces are parallel to the axial direction of the stop pin 13. Among them, the distance between the first plane 131a and the second plane 131b (i.e., the thickness of the stop pin 13) is substantially the same as the height of the receiving groove 1121; the maximum distance between the first arc surface 131c and the second arc surface 131d is slightly smaller than the width of the receiving groove 1121.

[0087] A second spring limiting groove 1311 is formed at one axial end of the stop pin body 131 . The second spring limiting groove 1311 is a circular groove with a conical bottom. The diameter of the second spring limiting groove 1311 is substantially the same as that of the first spring limiting groove 1122 .

[0088] The matching portion 132 extends from the other axial end of the stop pin body 131 along the axial direction of the stop pin body 131. The matching portion 132 is generally wedge-shaped, and its four side surfaces are respectively a third plane 132a, a fourth plane 132b, a third arc surface 132c, and a fourth arc surface 132d, which are respectively coplanar with the above four side surfaces of the stop pin body 131. In addition, the matching portion 132 also has an outer end surface 132e, which is a plane and also has two parallel sides and two arc-shaped sides protruding outward. The outer end surface 132e is inclined axially with respect to the stop pin body 131, and the inclination angle relative to the axial direction is 30° to 80°, that is, when in use, the outer end surface 132 is inclined at a radial angle of 30° to 80° relative to the rotating shaft, and is inclined at a circumferential tangent of the gear hole 1211 at a angle of 10° to 60°; in this embodiment, the outer end surface 132 is inclined at an axial angle of 60° relative to the stop pin body 131.

[0089] The outer end surface 132e of the matching portion 132 is used to cooperate with the limiting groove 1213 to realize the free rotation of the reducer output shaft 11 along the above-mentioned working rotation direction D1; the third arc surface 132c is used to cooperate with the limiting groove 1213 to prevent the reverse rotation along the working rotation direction D1. In this embodiment, the outer end surface 132e is a rotational matching surface, and the third arc surface 132c is a stop matching surface.

[0090] The stop pin 13 is a metal part, and the metal material itself has wear resistance, or the metal part has wear resistance through a heat treatment process, so that the stop pin 13 is not easy to be obviously worn during long-term use, thereby improving the stability of the reverse limiting mechanism 10 during operation. In this embodiment, the stop pin 13 is an iron part, and the heat treatment process makes it wear-resistant. In an alternative solution, the stop pin 13 can also be made of a polymer wear-resistant and impact-resistant modified material, which has certain wear resistance and can also make the noise during the operation of the reverse limiting mechanism 10 smaller.

[0091] The stop driving member 14 is used to drive the stop pin 13 to move toward the outside of the receiving groove 1121 along its length direction, so as to press the matching portion 132 of the stop pin 13 into one of the limiting grooves 1213. In this embodiment, the stop driving member 14 is a spring.

[0092] The overall shape of the bearing 15 is an oblate cylindrical shape, and a through bearing hole is provided in the middle thereof. The specific structure of the bearing 15 is prior art and will not be described in detail. In this embodiment, the diameter of the bearing hole matches the outer diameter of the cylindrical portion of the shaft column 112, and the overall outer diameter of the bearing 15 is close to or consistent with the outer diameter of the shaft mounting plate portion 111. The depth of the main body cover portion 121 of the limiting plate 12 is approximately half of the axial height of the bearing 15.

[0093] like Figure 7 As shown, the reducer housing 20 includes a housing upper end portion 21 and a housing main body 22 which are integrally formed.

[0094] The upper end portion 21 of the outer shell is in the shape of an annular plate and has a plurality of mounting holes, which respectively correspond to the plurality of limiting disk mounting holes 1211 of the limiting disk 12. The outer diameter of the upper end portion 21 of the outer shell corresponds to the outer diameter of the limiting disk 12, and the inner diameter of the upper end portion 21 of the outer shell is slightly smaller than the diameter of the main body cover 121. Therefore, the limiting disk 12 can be fixed to the upper end portion 21 of the outer shell by fasteners and used as a reducer end cover at the same time.

[0095] The outer shell body 22 is cylindrical, and its outer periphery has four relatively large outer shell limiting surfaces 221 (planes) and an arc surface between two adjacent outer shell limiting surfaces 221. The cross-sectional shape along its length direction is close to a rounded octagon. The inner periphery of the outer shell body 22 has an inner gear ring 222.

[0096] A grid-shaped reinforcing rib structure is provided on the inner surface of the nail gun housing, wherein in the cylindrical portion 540, a rectangular embedding groove matching the outer peripheral shape of the reducer housing 20 is formed between the reinforcing rib structures, so that the reducer housing 20 can be embedded therein without axial rotation during use.

[0097] The reducer input shaft 30 is used to connect with the motor and rotate under the drive of the motor. The lower end of the reducer input shaft 30 has an engaging groove matching the motor output shaft and can be engaged on the motor output shaft. The upper end of the reducer input shaft 30 is a gear structure.

[0098] The reduction gear set 40 is used to cooperate with the reducer input shaft 30 and the reducer output shaft 11 to achieve deceleration and torque increase, that is, compared with the reducer input shaft 30, the speed of the reducer output shaft 11 is reduced and the torque is increased. The reduction gear set 40 includes a plurality of first-stage gears 41, a first-stage toothed disc 42, a plurality of second-stage gears 43, a second-stage toothed disc 44, and a plurality of third-stage gears 45. The upper end of the reducer input shaft 30 is located in the middle of the plurality of first-stage gears 41 and meshes with all the first-stage gears 41, the plurality of second-stage gears 43 are respectively meshed with the gear structure protrusions in the middle of the first-stage toothed disc 42 located in the middle thereof, the plurality of third-stage gears 45 are respectively meshed with the gear structure protrusions in the middle of the second-stage toothed disc 44 located in the middle thereof, and the three-stage gears are respectively meshed with the inner gear ring 222 of the reducer housing 20 of the outer ring thereof. By setting the size of the three-stage gears, the rotation speed of the plurality of third-stage gears 45 is less than the rotation speed of the reducer input shaft 30.

[0099] The shaft mounting plate portion 111 of the reducer output shaft 11 is pin-connected to one or more third-stage gears 45 via one or more cylindrical connecting pins 46 , thereby driving the reducer output shaft 11 to rotate via the third-stage gears 45 .

[0100] The specific structures of the inner gear ring of the reducer housing 20, the reducer input shaft 30 and the reduction gear set 40 are the same as the corresponding component structures in the three-stage planetary gear reducer in the prior art, so they are not described in detail.

[0101] After assembly, the shaft column 112 of the reducer output shaft 11 passes through the gear hole 1211 in the middle of the limiting plate 12. The reducer output shaft 11 and the limiting plate 12 are coaxially arranged, and in the radial direction of both, the receiving groove 1121 is basically aligned with the gear hole 1211 (i.e., from Figure 3 The two are located at the same height in the figure). The main body 131 of the stop pin 13 is embedded in the receiving groove 1121, and there is a certain gap between the two sides and four corners of the main body 131 of the stop pin in the width direction and the inner wall of the receiving groove 1121. The matching part 132 of the stop pin 13 is located outside the receiving groove 1121, and the inclination direction of the rotating matching surface 132e of the matching part 132 is consistent with the inclination direction of the limiting tooth 1212 and the limiting groove 1213. The stop pin 13 can move along its length direction (that is, the radial direction of the reducer output shaft 11 and the limiting disk 12). The stop drive member 14 (spring) is arranged in the receiving groove 1121, one end of which is embedded in the first spring limiting groove 1122 of the reducer output shaft 11 and abuts against the bottom of the groove, and the other end is embedded in the second spring limiting groove 1311 of the stop pin 13 and abuts against the bottom of the groove.

[0102] The bearing 15 is mounted on the shaft column 112 of the reducer output shaft 11, and the upper end of the bearing 15 is roughly embedded in the main body cover 121 of the limiting disk 12, the upper surface of the bearing 15 is in contact with the top inner surface of the main body cover 121, and the lower end of the bearing 15 is roughly embedded in the upper end portion 21 of the reducer housing 20.

[0103] The motor assembly 700 includes a motor 710 (rotational driver) and a motor end cover 720 .

[0104] In this embodiment, the motor 710 is a brushless motor, and the axial cross section of its output shaft is D-shaped, that is, the side of the motor output shaft has a plane. As mentioned above, the lower end of the reducer input shaft 30 has a matching groove. The motor end cover 720 is roughly disc-shaped, and has a plurality of first fixing holes for fixing with the reducer housing 20 and a plurality of second fixing holes for fixing with the upper end of the motor 710, so that the upper end of the motor 710 can be fixed with the reducer housing 20. As mentioned above, the reducer housing 20 is stuck in the rectangular groove on the inner surface of the nail gun housing, so that the motor 710 can be limited by such fixation to prevent it from axial rotation during use.

[0105] The motor 710 and the motor end cover 720 may specifically adopt structures in the prior art, for example, the corresponding structures disclosed in CN116000876A, and thus will not be described in detail.

[0106] Fig.18 It is a cross-sectional view of the reverse limiting mechanism in the present embodiment when it is in use.

[0107] like Fig.18 As shown, when the motor 710 is not working, under the action of the stop drive 14 (spring), the stop pin 13 is pushed out toward the outside of the accommodating groove 1121 along its length direction (that is, the radial direction of the reducer output shaft 11 and the limiting disk 12), and the matching portion 132 of the stop pin 13 is pressed toward one of the limiting grooves 1213, and the wedge-shaped outer end of the matching portion 132 is embedded in the limiting groove 1213, and its stop matching surface 132c faces the first side surface 1213a (a straight surface parallel to the radial direction), and the rotating matching surface 132e faces the second side surface 1213b (an inclined surface inclined relative to the radial direction).

[0108] When the output shaft 11 of the reducer is electrically given a positive driving force to rotate along the working rotation direction D1, the output shaft 11 of the reducer drives the stop pin 13 to rotate along the D1 direction under the action of the force, and the rotational mating surface 132e of the stop pin 13 contacts the second side surface 1213b, that is, two inclined surfaces inclined relative to the radial direction contact each other, and the component force along the radial direction of the positive driving force on the two inclined surface contact parts overcomes the spring force to push the stop pin 13 into the receiving groove 1121, so that the output shaft 11 of the reducer can rotate along the D1 direction. The spring force of the stop driving member 14 (spring) is designed according to the factors such as the inclination angle of the rotational mating surface 132e, the inclination angle of the second side surface 1213b, the length of the stop pin 13, the magnitude of the positive driving force, etc., so that when the positive driving force is applied, the component force along the radial direction is greater than the spring force. Therefore, when the output shaft of the motor 710 rotates along the predetermined working direction D1, it drives the reducer input shaft 30 to rotate synchronously, and then drives the reducer output shaft 11 to rotate at a reduced speed through the reduction gear set 40. At this time, the reverse limiting mechanism 10 will not hinder the rotation.

[0109] When a reverse driving force is applied to the output shaft 11 of the reducer to rotate in the opposite direction to the working rotation direction D1, the output shaft 11 of the reducer attempts to drive the stop pin 13 to rotate in the opposite direction to the direction D1 under the action of the force, and the stop mating surface 132c of the stop pin 13 contacts the first side surface 1213a, that is, two surfaces parallel to the radial direction contact, so the reverse driving force will not generate a component force in the radial direction on the contact part of the two surfaces, so the stop pin 13 will not be pushed into the receiving groove 1121, and the stop mating surface 132c abuts against the first side surface 1213a, so that the output shaft 11 of the reducer cannot rotate in the reverse direction. Therefore, when the output shaft of the motor 710 attempts to rotate in the reverse direction of the predetermined working direction D1, a corresponding force is applied to the input shaft 30 of the reducer, and the force is transmitted to the output shaft 11 of the reducer through the reduction gear set 40. The force cannot overcome the spring force of the stop driving member 14, and the output shaft 11 of the reducer will not rotate in the reverse direction.

[0110] Functions and Effects of Embodiment 1

[0111] According to the reducer and nail gun provided in this embodiment, the reducer includes a cylindrical housing, a reduction gear set, an input shaft and an output shaft, so that the reduction gear set can cooperate with the input shaft and the output shaft to achieve deceleration and torque-increasing output; further, the reducer also includes a limiting disk with a gear hole, a stop pin set in a receiving groove on the output shaft, and a stop driving member, so that the output shaft can also be rotated in one direction by cooperating with the stop pin and the gear hole. Among them, the limiting disk is in the shape of a cover and is set on one end of the housing, that is, it is used to achieve reverse restriction while also serving as a reducer end cover, making the overall structure of the reducer more streamlined. In particular, the stop pin is arranged in the receiving groove on the output shaft and moves in the groove, that is, the stop pin is arranged on the inner ring of the limiting disk, and does not need to occupy the radially outer space of the limiting disk, and the movement of the stop pin utilizes the space inside the output shaft, so the aperture of the gear hole can be set smaller, and the spacing between the output shaft and the limiting disk can also be set very small, so compared with the traditional ratchet assembly, the overall size of the reverse limiting structure in the reducer of the utility model is greatly reduced, the size of the reducer of the utility model is close to the size of the existing reducer, and it can also effectively realize the function of unidirectional rotation, and can be well applied to nail guns with portable needs and handheld operation needs. In addition, the reverse limiting structure is relatively simple, the components are easy to process, and the cost is lower than that of the existing one-way bearings, which is conducive to making the nail gun have further cost advantages.

[0112] In the embodiment, the gear hole has a plurality of limiting teeth, and the limiting teeth have a first side surface and a second side surface, the first side surface is parallel to the radial direction, and the second side surface is inclined relative to the radial direction. Therefore, when the output shaft of the reducer is subjected to a positive driving force, the two inclined surfaces of the second side surface and the rotating mating surface of the stop pin cooperate to generate a radial component force toward the accommodating groove on the stop pin, and the stop pin can be pressed into the accommodating groove, so that the output shaft of the reducer can rotate forward basically without hindrance; and when the output shaft of the reducer is subjected to a reverse driving force, the two straight surfaces of the first side surface and the stop mating surface of the stop pin cooperate to generate basically no component force in the radial direction, thereby effectively preventing the output shaft of the reducer from rotating in the reverse direction.

[0113] Furthermore, the side surface of the stop pin has two planes, and the shape of the accommodating groove is adapted thereto, so that it can play a guiding role when the stop pin moves, thereby preventing the stop pin from rotating in its axial direction when moving, and maintaining the stability of the reverse limiting mechanism when working.

[0114] Furthermore, in the embodiment, the check pin is an iron part and has undergone a heat treatment process, so it has good wear resistance. During long-term use, its wedge-shaped outer end is not easily subject to wear, which can reduce the frequency of disassembly and maintenance of the reducer and replacement of the check pin components.

[0115] Furthermore, the output shaft of the reducer has a shaft mounting disc portion and a shaft column portion, so the shaft mounting disc portion can be conveniently arranged above the third-stage gear in the reduction gear group, and the shaft mounting disc portion can be connected to the third-stage gear in the reduction gear group through corresponding pins. In this way, not only the rotation of the output shaft of the reducer is more stable, but also there is no need to process a gear structure for cooperating with the third-stage gear at one end of the output shaft of the reducer, and the processing and manufacturing of the output shaft of the reducer is more convenient.

[0116] Furthermore, a bearing is installed between the limiting disk and the shaft mounting disk portion of the reducer output shaft, and the upper end of the bearing is embedded in the cover-shaped limiting disk, and the lower end of the bearing is embedded in the upper end of the annular reducer housing, which is beneficial to improving the coaxiality between the reducer housing and the limiting disk and the reducer output shaft, thereby further improving the stability of the reducer output shaft during rotation.

[0117] <Example 2>

[0118] This embodiment provides a speed reducer and a nail gun. In this embodiment, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0119] Compared with the first embodiment, the difference lies in that the structure of the stop pin 13 of this embodiment is different, and accordingly, the structure of the receiving groove 1121 on the reducer output shaft 11 is also different.

[0120] In the first embodiment, the cross-sectional shape of the stop pin 13 is axially symmetrical, so there is a possibility of reverse installation, causing the outer end surface 132e (rotational mating surface) to be tilted in the opposite direction to the predetermined direction, and the reverse limiting mechanism 10 cannot work normally. This embodiment is intended to further solve the above problem.

[0121] Fig.19 : is a three-dimensional diagram of the stop pin in this embodiment, Fig. 20 It is an orthographic projection diagram of the stop pin in this embodiment.

[0122] like Fig.19 and Fig. 20As shown, the stop pin 13 of this embodiment is in the shape of a cylinder with a missing part. For the convenience of description, the axial and radial directions of the corresponding complete cylinder are taken as the axial and radial directions of the stop pin 13. The cross section of the stop pin 13 in the axial direction is D-shaped, and its side surface includes a cylindrical surface 13a and a limiting surface 13b. The limiting surface 13b is a plane perpendicular to the radial direction of the stop pin 13. One end of the stop pin 13 in the axial direction has a plane inclined relative to its axial direction, which is the outer end surface 13c. The outer end surface 13c has an inclination angle of 30° to 80° relative to the axial direction of the stop pin 13, and is 60° in this embodiment. That is, when it is matched with the gear hole 1211, the inclination angle of the outer end surface 13 relative to the circumferential tangent of the gear hole 1211 is 10° to 60°, and is 30° in this embodiment.

[0123] Correspondingly, the cross-sectional shape of the receiving groove 1121 along its extending direction matches the cross-sectional shape of the stop pin 13 , that is, the cross-sectional shape of the receiving groove 1211 is also D-shaped.

[0124] In this embodiment, other structures are the same as those in the first embodiment, and thus will not be described again.

[0125] Example 2 Function and Effect

[0126] According to the reducer and nail gun provided by this embodiment, on the basis of the functions and effects of the first embodiment, since the side surface of the stop pin includes an incomplete cylindrical surface and a plane, it no longer has axial symmetry. Therefore, not only can the problem of axial rotation of the stop pin during operation be prevented by the plane, but also a fool-proof mechanism is provided by the structure with only a single plane, which can avoid the problem of installing the stop pin upside down, thereby making the assembly and maintenance of the reducer more convenient.

[0127] <Example 3>

[0128] This embodiment provides a speed reducer and a nail gun. In this embodiment, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0129] Compared with the second embodiment, the difference is that the structure of the stop pin 13 of this embodiment is different.

[0130] In the second embodiment, the material of the stop pin 13 is a wear-resistant metal material, or a modified polymer material that is wear-resistant and impact-resistant. However, the wear-resistant metal material will cause relatively large noise during operation due to its high hardness; although the above-mentioned modified material has certain wear resistance, its wear resistance is lower than that of metal, and it is relatively more susceptible to wear, and the stop pin 13 needs to be replaced more frequently. This embodiment aims to further solve the above problems and improve user experience.

[0131] Fig.21It is a three-dimensional view of the stop pin in this embodiment.

[0132] like Fig.21 As shown, the stop pin 13 of this embodiment also includes a noise reduction layer 133. The noise reduction layer 133 is a thin sheet-like piece with a certain thickness and is arranged on the outer end surface 132e. The noise reduction layer 133 is made of the above-mentioned polymer wear-resistant and impact-resistant modified material and is formed on the outer end surface 132e through injection molding or wrapping technology. It can cover substantially the entire outer end surface 132e, or cover most of the area in the middle of the outer end surface 132e.

[0133] In this embodiment, the outer surface 133a of the noise reduction layer 133 is a rotational mating surface.

[0134] The stop pin body portion 131 and the matching portion 132 of the stop pin 13 are made of wear-resistant metal material in one piece, that is, a metal part.

[0135] Fig. 22 It is an orthographic projection diagram of the reverse limiting mechanism in use in this embodiment.

[0136] like Fig. 22 As shown, when a positive driving force is applied to the reducer output shaft 11 in the direction D1, the outer surface 133a (rotational mating surface) of the noise reduction layer 133 of the stop pin 13 contacts the second side surface 1213b (inclined surface), thereby reducing noise during operation.

[0137] When a reverse driving force is applied to the reducer output shaft 11 to rotate in the opposite direction to the D1 direction, the third arc surface 132c (stop mating surface) of the reducer output shaft 11 contacts the first side surface 1213a (straight surface), that is, the metal part abuts against the limiting tooth 121.

[0138] In this embodiment, other structures are the same as those in the second embodiment, so they will not be described again.

[0139] In addition to the stop pin 13 structure shown in Example 2 and Example 3, the stop pin 13 may also adopt other structures. For example, the stop pin may also be in the shape of a square column or a special-shaped column, such as a cylindrical shape with a boss. The receiving groove has a groove corresponding to the boss, which can also guide the stop pin and prevent it from axial rotation.

[0140] In addition, the noise reduction layer 133 of this embodiment can also be provided on the basis of the structure of the stop pin 13 of the first embodiment.

[0141] Functions and Effects of Embodiment 3

[0142] According to the reducer and nail gun provided in this embodiment, on the basis of the functions and effects of the first embodiment, since the stop pin adopts the form of a combination of a main metal part and a modified material layer, the modified material layer at the outer end can make the noise during operation smaller, and the main metal part can achieve good wear resistance, so that the reducer has better stability during long-term use, and can also reduce the frequency of disassembly, maintenance and replacement of parts of the reducer and nail gun, so that the user experience is better.

[0143] <Modification 1>

[0144] This variation provides a speed reducer and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0145] Compared with the first embodiment, the difference lies in that in the reverse rotation limiting mechanism 10 of this variation, the structure of the gear hole 1211 of the limiting plate 12 is different.

[0146] Fig.23 It is an orthographic projection diagram of the limiting disk in this variation.

[0147] like Fig.23 As shown, in the gear hole 1211 of the limiting disk 12 of this modified example, the first side surface 1213a and the second side surface 1213b are both inclined relative to the radial direction of the limiting disk 12, and the inclination directions of the two are different. In this modified example, based on the radial direction of the bottom center line of a limiting groove 1213, the inclination angle of the first side surface 1213a of the limiting groove 1213 is 5° to 20°, and the inclination angle of the second side surface 1213b is 30° to 45°, that is, the inclination angle of the first side surface 1213a is smaller than the inclination angle of the second side surface 1213b.

[0148] The spring force of the anti-reciprocating drive member (spring) 14 is designed and adjusted according to the inclination angles of the first side surface 1213a and the second side surface 1213b, so that when a positive driving force is given to the reducer output shaft 11 to rotate along the D1 direction, the radial component of the positive driving force is sufficient to overcome the spring force; and when a reverse driving force is given to the reducer output shaft 11 in the opposite direction of the D1 direction, the radial component of the reverse driving force is much smaller than the spring force, thereby being able to achieve the same effect as in Example 1.

[0149] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0150] In addition, in this variation, the stop pin 13 structure of the second or third embodiment may also be adopted.

[0151] <Modification 2>

[0152] This variation provides a speed reducer and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0153] Compared with the first embodiment, the difference lies in that in the reverse rotation limiting mechanism 10 of this variation, the structure of the gear hole 1211 of the limiting plate 12 is different.

[0154] Fig.24 It is an orthographic projection diagram of the limiting disk in this variation.

[0155] like Fig.24 As shown, in the gear hole 1211 of the limiting disk 12 of this modified example, the cross-section of the limiting groove 1213 in the axial direction of the limiting disk 12 is roughly trapezoidal, and the bottom surface 1213c is roughly a plane parallel to the radial direction of the limiting disk 12. The first side surface 1213a and the second side surface 1213b are both inclined relative to the radial direction of the limiting disk 12, and the inclination directions of the two are the same. In this modified example, based on the radial direction of the boundary line between the bottom surface 1213c and the second side surface 1213b of a limiting groove 1213, the inclination angle of the first side surface 1213a of the limiting groove 1213 is 5° to 20°, and the inclination angle of the second side surface 1213b is 30° to 45°, that is, the inclination angle of the first side surface 1213a is smaller than the inclination angle of the second side surface 1213b.

[0156] When the positive driving force is applied, the situation is the same as that in the second embodiment and will not be described in detail.

[0157] When a reverse driving force is applied, the stop mating surface 132c parallel to the radial direction contacts the second side surface 1213b. Depending on the contact situation, no force component will be generated or a force component will be generated radially outward, so the stop pin 13 will not be pushed into the receiving groove 1121.

[0158] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0159] In addition, in this variation, the stop pin 13 structure of the second or third embodiment may also be adopted.

[0160] <Variation 3>

[0161] This variation provides a speed reducer and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0162] Compared with the first embodiment, the difference lies in that in the reverse rotation limiting mechanism 10 of this variation, the structure of the gear hole 1211 of the limiting plate 12 is different.

[0163] Fig.25 It is an orthographic projection diagram of the limiting disk in this variation.

[0164] like Fig.25 As shown, in the gear hole 1211 of the limiting disk 12 of this modified example, the limiting groove 1213 is an isosceles trapezoidal groove, and the first side surface 1213a and the second side surface 1213b are both parallel to the radial direction of the limiting disk 12 and perpendicular to the circumferential direction of the gear hole 1211, that is, they are both straight surfaces.

[0165] When a positive driving force is applied to the output shaft 11 of the reducer to rotate in the direction D1, since the rotating mating surface 132e of the stop pin 13 is an inclined surface, the rotating mating surface 132e contacts the first side surface 1213a, and a component force radially toward the receiving groove 1121 is still generated. The spring of the stop driving member 14 (spring) is designed and adjusted according to the angle of the first side surface 1213a, the inclination angle of the rotating mating surface 132e, etc. of this modified example, so that the component force is greater than the spring force, thereby being able to push the stop pin 13 toward the receiving groove 1121.

[0166] When a reverse driving force is applied to the output shaft 11 of the reducer in the direction opposite to the direction D1, the situation is the same as that in the first embodiment and will not be described in detail.

[0167] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0168] In addition, in this variation, the stop pin 13 structure of the second or third embodiment may also be adopted.

[0169] <Variation 4>

[0170] This variation provides a speed reducer and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0171] Compared with the first embodiment, the difference is that in the reverse rotation limiting mechanism 10 of this variation, the structure of the anti-directional driving member 14 is different.

[0172] Fig.26 It is a three-dimensional view of the stop driving member in this modified example.

[0173] like Fig.26 As shown, in this modified example, the stop driving member 14 is a bent metal sheet strip having one or more bent portions 141. In this embodiment, the stop driving member 14 has one bent portion 141, and is V-shaped as a whole. The stop driving member 14 is also arranged in the receiving groove 1121, one end of which abuts against the bottom of the receiving groove 1121, and the other end abuts against one end of the stop pin 13 located in the receiving groove 1121. The bottom of the receiving groove 1121 and the end surface of the end of the stop pin 13 can also be modified according to the structure of the stop driving member 14, so that the stop driving member 14 can be installed therein more stably.

[0174] When the stop pin 13 is subjected to a force radially toward the accommodating groove 1121, the stop driving member 14 deforms (i.e., the angle of the V-shape becomes smaller) to cause the stop pin 13 to move toward the accommodating groove 1121; when the stop pin 13 is no longer subjected to the above force, the stop driving member 14 provides a force to push the stop pin 13 out by deforming and resetting.

[0175] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0176] In addition, in this variation, the stop pin 13 structure of the second or third embodiment may also be adopted, or the limiting disk 12 structure of any one of the variations one to three may also be adopted.

[0177] <Variant Example 5>

[0178] This variation provides a speed reducer and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0179] Compared with the first embodiment, the difference is that in the reverse rotation limiting mechanism 10 of this variation, the structure of the anti-rotation driving member is different.

[0180] In this modified example, the stop driving member is an elastic body in the shape of a square column or a cylinder, and can be a rubber or rubber-plastic part. The stop driving member is also arranged in the receiving groove 1121, one end of which abuts against the bottom of the receiving groove 1121, and the other end abuts against one end of the stop pin 13 located in the receiving groove 1121. When the stop pin 13 is subjected to a force radially toward the receiving groove 1121, the stop driving member moves the stop pin 13 toward the receiving groove 1121 through deformation and extrusion; when the stop pin 13 is no longer subjected to the above force, the stop driving member provides a force to push the stop pin 13 out through deformation and reset.

[0181] In an alternative solution, the stop driving member may also have a cross-sectional shape that matches the cross-sectional shape of the receiving groove 1121 .

[0182] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0183] In addition, in this variation, the stop pin 13 structure of the second or third embodiment may also be adopted, or the limiting disk 12 structure of any one of the variations one to three may also be adopted.

[0184] The above embodiments are only used to illustrate the specific implementation of the utility model, and the utility model is not limited to the description scope of the above embodiments. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A speed reducer, arranged in a nail gun having a rotating component and a rotating drive, characterized in that: include: Shell, cylindrical; An input shaft connected to the rotary driver and driven to rotate; A limiting plate, in the shape of a cover, is disposed on one end of the housing and has a gear hole in the middle thereof; an output shaft, passing through the gear hole and being coaxially arranged with the gear hole, having a receiving groove extending in its radial direction, wherein the receiving groove corresponds to the axial position of the gear hole; A stop pin, disposed in the receiving groove and movable along the extending direction thereof, one end of which is an outer end portion located outside the receiving groove and is used to cooperate with the gear hole to realize unidirectional rotation of the output shaft; A non-directional driving member, disposed in the receiving groove; as well as The reduction gear set is arranged in the housing and is used to cooperate with the input shaft and the output shaft to achieve reduced output.

2. The reducer according to claim 1, characterized in that: in, The inner periphery of the housing has an inner gear ring, the housing and the reduction gear set constitute a multi-stage planetary gear set, and the multi-stage planetary gear set includes multi-stage gears. The output shaft has: The mounting disc part is in the shape of a disc and has a plurality of output shaft mounting holes, and is connected to the last gear of the multi-stage gear through a connecting piece; and The shaft column portion is coaxially arranged with the mounting plate portion, and the receiving groove is arranged in the middle of the shaft column portion.

3. The reducer according to claim 2, characterized in that: Also includes: The bearing is cylindrical and is mounted on the shaft column and between the limiting plate and the mounting plate. Wherein, one end of the shell is in a circular ring shape. One axial end of the bearing is embedded in the limiting disk, and the other axial end is embedded in one end of the housing.

4. The reducer according to claim 1, Features: in, The outer periphery of the gear hole is provided with a plurality of limiting teeth, and a limiting groove is formed between two adjacent limiting teeth, and the limiting groove has a first side surface and a second side surface parallel to the axial direction of the gear hole. The outer end portion of the stop pin has: a stop mating surface, parallel to the radial direction of the output shaft, and used to abut against the first side surface when the output shaft is subjected to a reverse driving force, so as to prevent the output shaft from rotating in the reverse direction; as well as The rotating mating surface is inclined relative to the radial direction of the output shaft, and is used to abut against the second side surface when the output shaft is subjected to a positive driving force, pressing the stop pin toward the accommodating groove, so that the output shaft can rotate in the positive direction.

5. The reducer according to claim 4, characterized in that: in, The first side surface is parallel to the radial direction, The inclination angle of the second side surface relative to the corresponding first side surface is 30° to 45°, The inclination angle of the rotating fitting surface relative to the radial direction is 30° to 80°.

6. The reducer according to claim 4, characterized in that: in, The first side surface and the second side surface are both inclined relative to the radial direction, With respect to a first radial direction of the output shaft passing through a boundary between the first side surface and the second side surface, the first side surface and the second side surface are inclined toward two sides respectively. The inclination angle of the first side surface relative to the first radial direction is 5° to 20°, The inclination angle of the second side surface relative to the first radial direction is 30° to 45°, The inclination angle of the rotating fitting surface relative to the radial direction is 30° to 80°.

7. The reducer according to claim 4, characterized in that: in, The first side surface and the second side surface are both inclined relative to the radial direction, With respect to a first radial direction of the output shaft passing through a boundary between the first side surface and the second side surface, the first side surface and the second side surface are inclined toward the same side. The inclination angle of the first side surface relative to the first radial direction is 5° to 20°, The inclination angle of the second side surface relative to the first radial direction is 30° to 45°, The inclination angle of the rotating fitting surface relative to the radial direction is 30° to 80°.

8. The reducer according to claim 2, characterized in that: in, The stop pin is columnar, and its side surface includes a cylindrical surface and a flat surface, and the cylindrical surface is a stop mating surface. The cross-sectional shape of the accommodating groove matches the stop pin.

9. The reducer according to claim 2, Features: Wherein, the stop pin comprises: The metal piece is made of a wear-resistant metal material and is in a columnar shape, one end of which has a plane inclined relative to its axial direction, and one side surface of the metal piece is a forward mating surface; and The noise reduction layer is made of a wear-resistant and impact-resistant modified material and is arranged on the plane of the metal part. The outer surface of the noise reduction layer is a rotating fitting surface.

10. A nail gun, characterized in that: include: An elastic component, used to provide kinetic energy for nail shooting; A rotating component, used for compressing the elastic component to store energy by rotating; A rotary driver, used for driving the rotary component to rotate; as well as A reducer is used to reduce the speed and increase the torque of the output of the rotary driver and make the rotary component rotate in one direction. Wherein, the reducer is the reducer according to any one of claims 1-9.

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