Transmission mechanism of electric nail gun

Abstract

The utility model discloses a transmission mechanism of an electric nail gun, which comprises a working piston rod of a spring compression mechanism, an air cylinder piston rod of a vacuum air cylinder mechanism, a driving motor of a driving structure and a speed reducer, transmission teeth on the outer circumference of the driving gear are provided with a section of notch to form an incomplete tooth structure; a row of straight tooth grooves are formed in one side face of a piston rod of the air cylinder, the straight tooth grooves are in meshing transmission with the driving gear, and an upper rack is arranged above the piston rod of the air cylinder. Two lower racks are symmetrically arranged at the bottom of the working piston rod, the lower portion of each lower rack is in meshing transmission with a transmission gear, the two transmission gears are movably installed on an assembly rack of a nail gun body through the same transmission shaft, and the lower portion of one transmission gear is in meshing connection with an upper rack of an air cylinder piston rod. According to the design, the structure can be effectively simplified, the production cost is reduced, the assembly efficiency is improved, and the straightness of axial movement of the working piston rod can be improved.

Description

Technical Field

[0001] The utility model relates to an electric nail gun, in particular to a transmission mechanism of the electric nail gun. Background Art

[0002] Patent CN117021034A discloses a high-strength lithium-ion nail gun with a composite energy storage structure. Its energy storage structure organically combines spring compression and cylinder mechanism into one, which can not only multiply the energy storage strength, but also effectively reduce the axial and radial vibration problems at the end of nailing, thereby reducing labor intensity and improving the comfort of nailing operations.

[0003] The above patent also discloses that the driving mechanism mainly includes a driving motor, a reducer and a crank gear, the driving motor is directly connected to the reducer, the reducer is provided with a unidirectional rotating output shaft, the output shaft is provided with transmission teeth, the crank gear is arranged behind the output shaft, and the crank gear is meshed with the transmission teeth; a first pushing protrusion and a second pushing protrusion are circumferentially spaced apart on the upper edge of the top surface of the crank gear, and the height of the first pushing protrusion is lower than that of the second pushing protrusion, the first pushing protrusion corresponds to the position of the first pushing end, and the second pushing protrusion corresponds to the position of the second pushing end. When the crank gear rotates, the first pushing protrusion first abuts against the first pushing end and pushes the first pushing end to drive the vacuum cylinder piston rod to move forward to perform the first stage of energy storage. At the same time, in this process, the forward movement of the vacuum cylinder piston rod is transmitted through the meshing of the transmission gear, so that the working piston rod moves backward to compress the spring to perform the first stage of compression energy storage of the spring; after completing the first stage of energy storage, the second pushing protrusion abuts against the second pushing end and pushes the second pushing end, so that the vacuum cylinder piston rod continues to move forward to perform the second stage of energy storage, and at the same time pushes the working piston rod to move backward again to further compress the spring to perform the second stage of compression energy storage of the spring.

[0004] In the above-mentioned structure, the structural arrangement of the driving mechanism and the transmission mechanism is too complicated, which not only has high manufacturing cost but also troubles in assembly.

[0005] In addition, the above transmission gear directly meshes with the upper rack structure under the working piston rod for transmission, which makes it difficult to ensure the straightness of the axial movement of the working piston rod during operation, thereby causing the spring piston to be subjected to unilateral force, accelerating the wear of the compression cylinder of the spring compression mechanism and affecting the service life of the product. Utility Model Content

[0006] In view of the above problems, the utility model designs a transmission mechanism of an electric nail gun, which can effectively simplify the structure, reduce production costs, improve assembly efficiency, and can greatly improve the straightness of the axial movement of the working piston rod.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A transmission mechanism of an electric nail gun, comprising a working piston rod of a spring compression mechanism, a cylinder piston rod of a vacuum cylinder mechanism, a driving motor of a driving structure and a reducer, characterized in that: a driving gear is provided on the output shaft of the reducer, and a transmission tooth on the outer circumference of the driving gear is provided with a notch to form an incomplete tooth structure; a row of straight tooth grooves is provided on one side surface of the cylinder piston rod, the straight tooth grooves are meshed with the driving gear for transmission, and an upper rack is provided above the cylinder piston rod; two lower racks are symmetrically provided at the bottom of the working piston rod, and the lower part of each lower rack is meshed with a transmission gear for transmission, and the two transmission gears are movably mounted on the assembly frame of the nail gun body through the same transmission shaft, and the lower part of one of the transmission gears is meshed and connected with the upper rack of the cylinder piston rod.

[0009] More specifically, the lower portion of the other transmission gear is meshedly connected with a balance gear on the assembly frame.

[0010] More specifically, the above-mentioned spring compression mechanism includes a compression cylinder, a spring, a spring piston and the working piston rod. The spring and the spring piston are installed in the compression cylinder. The tail end of the spring is supported on the bottom of the compression cylinder, and the front end of the spring is connected to the spring piston. The spring has a pre-compression amount so that the spring piston and the working piston rod always have a tendency to move forward.

[0011] More specifically, the above-mentioned vacuum cylinder mechanism includes a cylinder body, a cylinder piston and the cylinder piston rod. The cylinder piston and the tail end part of the cylinder body form a completely sealed vacuum chamber. In the initial state, the cylinder piston is located at the tail end of the cylinder body, and the front end of the cylinder piston is connected to the cylinder piston rod extending out of the cylinder body.

[0012] More specifically, the widths of the first and last two tooth grooves in the row of straight tooth grooves are more than twice the widths of the other tooth grooves.

[0013] More specifically, the transmission shaft is mounted on the assembly frame through a bearing movable positioning.

[0014] More specifically, the assembly frame is provided with a travel control switch beside the driving gear, and a trigger protrusion is provided on the driving gear. When the trigger protrusion rotates with the driving gear, it can touch the travel control switch and turn off the driving motor.

[0015] The transmission mechanism of the above structure is arranged, when working, the driving motor drives the reducer, the reducer drives the driving gear on the output shaft thereof to rotate, the driving gear drives the cylinder piston rod forward through the meshing transmission with the tooth groove to perform the energy storage operation of the vacuum cylinder mechanism, and at the same time in this process, the forward movement of the cylinder piston rod is transmitted through the meshing transmission of the transmission gear and the upper rack, so that the working piston rod moves backward to compress the spring to store compression energy of the spring compression mechanism, and the above energy storage process continues until the notch part of the driving gear rotates to the cylinder piston rod side, at this time the driving gear is separated from the tooth groove on the cylinder piston rod to release the constraint of the cylinder piston rod, and the cylinder movable rod will move backward and reset under the action of the negative pressure suction force, and at the same time the working piston rod will pop out quickly under the action of the spring reset force to perform the nailing operation.

[0016] Compared with the two-stage compression structure in the existing structure, the above transmission mechanism has been effectively simplified, which can not only effectively reduce the production cost, but also improve the assembly efficiency of the product to a certain extent.

[0017] In addition, the two symmetrically arranged upper racks and transmission gears below the working piston rod are symmetrically meshed to achieve balanced force, ensure the straightness of the axial movement of the working piston rod, and effectively avoid the occurrence of unilateral force on the spring piston, making the spring piston slide more smoothly and more wear-resistant, which can effectively increase the service life of the piston chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 , a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 , a schematic diagram of the three-dimensional structure of the utility model installed in a gun body;

[0020] Figure 3 , a three-dimensional structural diagram of the driving gear of the utility model;

[0021] Figure 4 , a three-dimensional structural diagram of the cylinder piston rod of the utility model;

[0022] Figure 5 , a three-dimensional structural diagram of the working piston rod of the utility model;

[0023] in,

[0024] 1—spring compression mechanism, 11—working piston rod, 12—compression cylinder, 13—spring, 14—spring piston, 111—lower rack;

[0025] 2—vacuum cylinder mechanism, 21—cylinder piston rod, 22—cylinder body, 23—cylinder piston, 211—straight tooth groove, 211a—front and rear tooth grooves, 212—upper rack;

[0026] 3—driving structure, 31—driving motor, 32—reducer, 33—driving gear, 331—notch, 332—transmission tooth;

[0027] 4—transmission gear, 41—transmission shaft;

[0028] 5—assembly frame, 51—balance gear;

[0029] 6—program control switch, 61—trigger protrusion. DETAILED DESCRIPTION

[0030] like Figure 1-5 As shown, a transmission mechanism of an electric nail gun includes a working piston rod 11 of a spring compression mechanism 1, a cylinder piston rod 21 of a vacuum cylinder mechanism 2, a driving motor 31 of a driving structure 3, and a reducer 32.

[0031] The spring compression mechanism 1 and the vacuum cylinder mechanism 2 are linked to each other and combined to form a composite force energy storage structure.

[0032] The spring compression mechanism 1 comprises a compression cylinder 12, a spring 13, a spring piston 14 and the working piston rod 11. The spring 13 and the spring piston 14 are installed in the compression cylinder 12, the tail end of the spring 13 is supported on the bottom of the compression cylinder 12, the front end of the spring 13 is connected with the spring piston 14, and the spring 13 has a pre-compression amount so that the spring piston 14 and the working piston rod 11 always have a tendency to move forward.

[0033] The vacuum cylinder mechanism 2 includes a cylinder body 22, a cylinder piston 23 and the cylinder piston rod 21. The cylinder piston 23 and the tail end of the cylinder body 22 form a completely sealed vacuum chamber. In the initial state, the cylinder piston 21 is located at the tail of the cylinder body 22, and the front end of the cylinder piston 23 is connected to the cylinder piston rod 21 extending out of the cylinder body 22.

[0034] The driving structure 3 includes a driving motor 31 and a reducer 32. A driving gear 33 is disposed on the output shaft of the reducer 32. The transmission teeth on the outer circumference of the driving gear 33 are provided with a notch 331 to form an incomplete tooth structure.

[0035] A row of straight tooth grooves 211 are provided on one side of the cylinder piston rod 21, and the straight tooth grooves 211 are meshed with the driving gear 33 for transmission. When in use, the notch 331 of the driving gear 33 is rotated to the cylinder piston rod 21 side and is separated from the cylinder piston rod, while the transmission teeth 332 of the other part of the driving gear 33 are rotated to the cylinder piston rod 21 side and are meshed with the straight tooth grooves 211. A lower rack 212 is provided above the cylinder piston rod 21.

[0036] Two lower racks 111 are symmetrically arranged at the bottom of the working piston rod 11, and the lower part of each lower rack 111 is meshed with a transmission gear 4 for transmission. The two transmission gears 4 are fixed on the same transmission shaft 41, and the transmission shaft 41 is movably mounted on the assembly frame 5 of the nail gun body through a bearing. The lower part of one of the transmission gears 4 is meshed with the upper rack 212 of the cylinder piston rod 21. Here, in order to obtain a better force balancing effect, the lower part of the other transmission gear 4 is meshed with the balance gear 51 on the assembly frame 5.

[0037] The transmission mechanism of the above structure is configured, when working, the driving motor 31 works and is decelerated by the reducer 32, the reducer 32 drives the driving gear 33 on the output shaft thereof to rotate, and the driving gear 33 drives the cylinder piston rod 21 forward through the meshing transmission with the spur tooth groove 211 to perform the energy storage operation of the vacuum cylinder mechanism 2. At the same time, in this process, the forward movement of the cylinder piston rod 21 is transmitted through the meshing transmission of the transmission gear 4 and the lower rack 111, so that the working piston rod 11 moves backward to compress the spring 13 to perform the compression energy storage of the spring compression mechanism 1.

[0038] The above energy storage process is continued until the notch 331 of the driving gear 33 rotates to the side of the cylinder piston rod 21. At this time, the driving gear 33 is separated from the straight tooth groove 211 on the cylinder piston rod 21, so that the constraint of the cylinder piston rod 21 is released, and the cylinder movable rod 21 will move back and reset under the action of the negative pressure suction force, and at the same time, the working piston rod 11 will quickly pop out under the action of the reset force of the spring 13 to perform the nailing operation. After the nailing is completed, the notch 331 of the driving gear 33 has rotated to the side of the cylinder piston rod 21. At this time, the transmission teeth 332 on the outer circumference of the driving gear 33 will be meshed and connected with the straight tooth groove 211 again to perform another energy storage operation.

[0039] Here, in order to ensure the smooth separation of the straight tooth groove 211 and the notch 331 on the driving gear 33 and the re-engagement of the transmission tooth 332, the width of the first and last tooth grooves 211a in the straight tooth groove 211 is more than twice the width of the tooth grooves in other parts, thereby providing sufficient space for separation and re-engagement to avoid interference.

[0040] In summary, the transmission mechanism of the above structure is effectively simplified compared to the two-stage compression structure in the existing structure, which can not only effectively reduce the production cost, but also improve the assembly efficiency of the product to a certain extent.

[0041] In addition, the two symmetrically arranged lower racks 111 and the transmission gear 4 below the working piston rod 11 are symmetrically meshed to achieve balanced force, ensure the straightness of the axial movement of the working piston rod 11, and effectively avoid the occurrence of unilateral force on the spring piston 14, so that the spring piston 14 slides more smoothly and is more wear-resistant, which can effectively improve the service life of the piston chamber.

[0042] The assembly frame 5 is provided with a stroke control switch 6 next to the driving gear 33, and a trigger protrusion 61 is provided on the driving gear 33. When the trigger protrusion 61 rotates with the driving gear 33, it can touch the stroke control switch 6 to turn off the driving motor 31. At this time, only when the user presses the control wrench of the nail gun again can the driving motor 31 be started again to perform further energy storage and nailing operations. The above structural arrangement and operation method can effectively shorten the nailing cycle of the nail gun and improve the safety of use.

[0043] The above description is only a preferred implementation mode of the utility model, and does not impose any form of limitation on the utility model. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. A transmission mechanism of an electric nail gun, comprising a working piston rod (11) of a spring compression mechanism (1), a cylinder piston rod (21) of a vacuum cylinder mechanism (2), a driving motor (31) of a driving structure (3) and a reducer (32), characterized in that: The output shaft of the reducer (32) is provided with a driving gear (33), and the transmission teeth on the outer circumference of the driving gear (33) are provided with a notch (331) to form an incomplete tooth structure; a row of straight tooth grooves (211) are provided on one side surface of the cylinder piston rod (21), and the straight tooth grooves (211) are meshed with the driving gear (33) for transmission, and an upper rack (212) is provided above the cylinder piston rod (21); two lower racks (111) are symmetrically provided at the bottom of the working piston rod (11), and the lower part of each lower rack (111) is meshed with a transmission gear (4) for transmission, and the two transmission gears (4) are movably mounted on an assembly frame (5) of the nail gun body through the same transmission shaft (41), and the lower part of one of the transmission gears (4) is meshed and connected with the upper rack (212) of the cylinder piston rod (21).

2. The transmission mechanism of an electric nail gun according to claim 1, characterized in that: The lower portion of the other transmission gear (4) is meshedly connected with a balance gear (51) on the assembly frame (5).

3. The transmission mechanism of an electric nail gun according to claim 1, characterized in that: The spring compression mechanism (1) comprises a compression cylinder (12), a spring (13), a spring piston (14) and the working piston rod (11); the spring (13) and the spring piston (14) are installed in the compression cylinder (12); the rear end of the spring (13) is supported on the bottom of the compression cylinder (12); the front end of the spring (13) is abutted against the spring piston (14); the spring (13) has a pre-compression amount so that the spring piston (14) and the working piston rod (11) always have a tendency to move forward.

4. The transmission mechanism of an electric nail gun according to claim 1, characterized in that: The vacuum cylinder mechanism (2) comprises a cylinder body (22), a cylinder piston (23) and the cylinder piston rod (21); the cylinder piston (23) and the rear end portion of the cylinder body (22) form a completely sealed vacuum chamber; in an initial state, the cylinder piston (23) is located at the rear end of the cylinder body (22), and the front end of the cylinder piston (23) is connected to the cylinder piston rod (21) extending out of the cylinder body (22).

5. The transmission mechanism of an electric nail gun according to any one of claims 1 to 4, characterized in that: The widths of the first and last two tooth grooves (211a) in a row of straight tooth grooves (211) are more than twice the widths of the tooth grooves in other parts.

6. The transmission mechanism of an electric nail gun according to any one of claims 1 to 4, characterized in that: The transmission shaft (41) is mounted on the assembly frame (5) through a bearing movable positioning.

7. The transmission mechanism of an electric nail gun according to any one of claims 1 to 4, characterized in that: The assembly frame (5) is provided with a travel control switch (6) beside the driving gear (33), and a trigger protrusion (61) is provided on the driving gear (33). When the trigger protrusion (61) rotates with the driving gear (33), it can touch the travel control switch (6) and turn off the driving motor (31).

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