Electric airsoft gun

Abstract

To suppress return of a piston caused by backlash between gears in an electric airsoft gun.SOLUTION: An electric airsoft gun comprises a cylinder, a piston, a spring, a rack gear attached to the piston, an electric motor, a power transmission mechanism, and a housing. The power transmission mechanism includes a pinion gear, a first double-stage gear, a second double-stage gear, a third double-stage gear, and a reverse rotation prevention unit that prevents reverse rotation of the second double-stage gear. The reverse rotation prevention unit includes a one-way clutch that fits with the rotation shaft of the second double-stage gear, a retaining portion that holds the one-way clutch, a pin that fits with a recess located radially outward of the second double-stage gear on the housing, and an arm member that connects the retaining portion and the pin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This specification discloses technology related to electric airsoft guns. [Background technology]

[0002] Electric airsoft guns are known as a type of toy gun (see, for example, Patent Document 1). In an electric airsoft gun, a piston, which is pressed forward by a spring inside a cylinder, is moved backward using the rotational power of an electric motor, and then the piston is released, causing compressed air to be generated inside the cylinder, which fires a spherical bullet. In such an electric airsoft gun, the rotational power of the electric motor is transmitted to the piston via a power transmission mechanism made up of multiple gears.

[0003] Patent Document 2 describes providing a reverse rotation prevention latch on one of the gears in the power transmission mechanism to prevent malfunctions caused by reverse rotation of various gears in the power transmission mechanism. Patent Document 2 also describes providing a one-way clutch on the output shaft of the electric motor to prevent malfunctions caused by such reverse rotation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-234191 [Patent Document 2] Patent No. 6620956 Summary of the Invention [Problem to be solved by the invention]

[0005] When a reverse latch is installed on the gear of the power transmission mechanism in an electric airsoft gun, there is a problem in that the piston returns forward by the amount of backlash (gap) between the gears between the reverse latch and the piston. When the piston returns forward, the pressure of the compressed air when the piston is released decreases by that amount, resulting in a decrease in the bullet's flight distance and instability. In addition, when a reverse latch is installed on the gear of the power transmission mechanism, there is a problem in that the operating noise of the reverse latch is generated, which interferes with play.

[0006] Furthermore, when a one-way clutch is provided on the output shaft of the electric motor in an electric airsoft gun, there is a problem in that the piston returns forward by an amount corresponding to backlash in the gear interposed between the output shaft and the piston. [Means for solving the problem]

[0007] The technology disclosed in this specification can be realized in the following forms.

[0008] One embodiment disclosed herein is an electric airsoft gun that fires a spherical bullet using compressed air. The electric airsoft gun includes a barrel through which the bullet passes, a cylinder connected to the barrel so as to supply the compressed air to the barrel, a piston configured to reciprocate inside the cylinder between a front side of the cylinder facing the barrel and a rear side of the cylinder opposite the barrel, a spring that presses the piston toward the front side, a rack gear attached to the piston in the direction in which the piston reciprocates, an electric motor that outputs rotational power to move the piston toward the rear side, a power transmission mechanism that transmits the rotational power output from the electric motor to the rack gear, and a housing that houses at least the power transmission mechanism. The power transmission mechanism includes: a pinion gear provided on the output shaft of the electric motor; a first double-stage gear having a bevel gear that meshes with the pinion gear and a first spur gear having fewer teeth than the bevel gear; a second double-stage gear having a second spur gear that meshes with the first spur gear and a third spur gear having fewer teeth than the second spur gear; a fourth spur gear that meshes with the third spur gear and a fifth spur gear having teeth that mesh with the rack gear over part of its circumference, the third double-stage gear being configured to move and hold the piston toward the rear side and release the piston toward the front side; and a reverse rotation prevention unit that prevents reverse rotation of the second double-stage gear. The reverse rotation prevention unit includes a one-way clutch that engages with the rotating shaft of the second double gear and allows rotation of the rotating shaft in a forward rotation direction that moves the piston rearward and prevents rotation of the rotating shaft in a direction opposite to the forward rotation direction; a holding part that holds the one-way clutch; a pin that engages with a recess located radially outward of the second double gear in the housing; and an arm member that connects the holding part and the pin. With this type of electric airsoft gun, a one-way clutch can be provided on the rotating shaft of the second double gear, which makes it possible to suppress return of the piston due to backlash between gears, compared to when a one-way clutch is provided on the electric motor before the rotational power is reduced by the power transmission mechanism.Furthermore, with this type of electric airsoft gun, the one-way clutch provided on the rotating shaft of the second two-stage gear prevents reverse rotation of the power transmission mechanism, thereby reducing operating noise compared to when a reverse rotation prevention latch is provided on the gear.

[0009] The technology disclosed in this specification can be realized in various forms other than electric airsoft guns, such as parts for electric airsoft guns and manufacturing methods. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing the configuration of an electric airsoft gun. [Figure 2] FIG. 4 is an explanatory diagram showing a detailed configuration of a reverse rotation prevention unit. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 is an explanatory diagram showing the configuration of an electric airsoft gun 10. The electric airsoft gun 10 is a toy gun that fires spherical bullets BB using compressed air. The electric airsoft gun 10 includes a housing 100, a supply unit 110, a trigger 120, a barrel 210, a cylinder 220, a piston 230, a spring 240, an electric motor 300, and a power transmission mechanism 500.

[0012] The housing 100 of the electric airsoft gun 10 houses various components of the electric airsoft gun 10. The housing 100 houses at least the power transmission mechanism 500. In addition to the power transmission mechanism 500, the housing 100 also houses a supply unit 110, a barrel 210, a cylinder 220, a piston 230, a spring 240, and an electric motor 300. The housing 100 is formed with recesses, protrusions, grooves, holes, and the like for fixing various components.

[0013] The supply unit 110 of the electric airsoft gun 10 supplies a new bullet BB to the barrel 210 every time a bullet BB is fired from the barrel 210.

[0014] The trigger 120 of the electric airsoft gun 10 is a switch that accepts an operation input from the finger of the user of the electric airsoft gun 10. In this embodiment, when the trigger 120 is pulled halfway through its movable range, the electric airsoft gun 10 moves the piston 230 in the cylinder 220 rearward, thereby entering a firing standby state in which it waits to fire a bullet BB. Thereafter, when the trigger 120 is pulled to the maximum movable range, the electric airsoft gun 10 releases the piston 230 in the cylinder 220 forward, thereby firing a bullet BB with compressed air generated in the cylinder 220.

[0015] The barrel 210 of the electric airsoft gun 10 is a cylindrical member that extends from the cylinder 220 to the front side of the electric airsoft gun 10. A bullet BB supplied to the barrel 210 by the supply unit 110 passes through the barrel 210 by the compressed air generated by the cylinder 220, and then flies forward of the electric airsoft gun 10.

[0016] The cylinder 220 of the electric airsoft gun 10 is a cylindrical member that extends from the barrel 210 to the rear side of the electric airsoft gun 10. The cylinder 220 is connected to the barrel 210 so as to be able to supply compressed air to the barrel 210.

[0017] The piston 230 of the electric airsoft gun 10 is configured to be able to reciprocate inside the cylinder 220 between the front side of the cylinder 220 on the barrel 210 side and the rear side of the cylinder 220 on the opposite side from the barrel 210. A rack gear 235 is provided on the outside of the piston 230 along the direction in which the piston 230 reciprocates.

[0018] The spring 240 of the electric airsoft gun 10 presses the piston 230 forward. The spring 240 is housed inside the cylinder 220 together with the piston 230. In this embodiment, the spring 240 is a coil spring.

[0019] The electric motor 300 of the electric airsoft gun 10 outputs rotational power that moves the piston 230 rearward. The electric motor 300 is actuated based on an operation input to the trigger 120. The electric motor 300 has an output shaft 305 that outputs the rotational power.

[0020] The power transmission mechanism 500 of the electric airsoft gun 10 transmits the rotational power output from the electric motor 300 to the rack gear 235 of the piston 230. The power transmission mechanism 500 includes a pinion gear 505, a first double gear 510, a second double gear 520, a third double gear 530, and a reverse rotation prevention unit 600.

[0021] The pinion gear 505 of the power transmission mechanism 500 is a gear provided on the output shaft 305 of the electric motor 300. In this embodiment, the pinion gear 505 is a bevel gear provided on the tip of the output shaft 305.

[0022] The first double gear 510 of the power transmission mechanism 500 has a rotating shaft 511, a bevel gear 512, and a first spur gear 514. The rotating shaft 511, the bevel gear 512, and the first spur gear 514 are integrally formed in the first double gear 510. The rotating shaft 511 is a rotating shaft common to the bevel gear 512 and the first spur gear 514. The rotating shaft 511 is rotatably held in the housing 100. The bevel gear 512 is a gear that meshes with the pinion gear 505. The first spur gear 514 is a gear with fewer teeth than the bevel gear 512. In this embodiment, the bevel gear 512 has 40 teeth, and the first spur gear 514 has 10 teeth.

[0023] The second double gear 520 of the power transmission mechanism 500 has a rotating shaft 521, a second spur gear 522, and a third spur gear 524. The second double gear 520 has the rotating shaft 521, the second spur gear 522, and the third spur gear 524 integrally formed therewith. The rotating shaft 521 is a rotating shaft common to the second spur gear 522 and the third spur gear 524. The rotating shaft 521 is rotatably held by the housing 100 and the reverse prevention unit 600. The second spur gear 522 is a gear that meshes with the first spur gear 514 of the first double gear 510. The third spur gear 524 is a gear with fewer teeth than the second spur gear 522. In this embodiment, the second spur gear 522 has 40 teeth, and the third spur gear 524 has 20 teeth.

[0024] The third double gear 530 of the power transmission mechanism 500 has a rotating shaft 531, a fourth spur gear 532, and a fifth spur gear 534. The rotating shaft 531, the fourth spur gear 532, and the fifth spur gear 534 are integrally formed with the third double gear 530. The rotating shaft 531 is a rotating shaft common to the second spur gear 522 and the third spur gear 524. The fourth spur gear 532 is a gear that meshes with the third spur gear 524 of the second double gear 520. The fifth spur gear 534 is a gear having teeth formed over a portion of its circumference that mesh with the rack gear 235 of the piston 230. As a result, the third double gear 530 is configured to move and hold the piston 230 rearward and to release the piston 230 forward. In this embodiment, the fourth spur gear 532 has 32 teeth, and the fifth spur gear 534 has 16 teeth over one half of the circumference and 0 teeth over the remaining half of the circumference.

[0025] 2 is an explanatory diagram showing the detailed configuration of the reverse rotation prevention unit 600. The reverse rotation prevention unit 600 is a component that prevents reverse rotation of the second double gear 520. The reverse rotation prevention unit 600 includes a one-way clutch 610, a holding portion 620, a pin 630, and an arm member 640.

[0026] One-way clutch 610 of reverse rotation prevention unit 600 is a cylindrical member that transmits rotational power in only one direction. One-way clutch 610 has a through hole 612 and a clutch mechanism 614. Through hole 612 fits onto rotating shaft 521 of second double gear 520. Clutch mechanism 614, which can rotate in only one direction, is provided on the inner circumferential surface of through hole 612. One-way clutch 610 allows rotating shaft 521 to rotate in the forward rotation direction that moves piston 230 rearward, and prevents rotating shaft 521 from rotating in the direction opposite to the forward rotation direction.

[0027] Retaining portion 620 of reverse prevention unit 600 is a portion that retains one-way clutch 610. Retaining portion 620 retains one-way clutch 610 by fitting onto the outside of one-way clutch 610. Retaining portion 620 has cutout 622, which is a mark left by cutting away a portion of retaining portion 620 to prevent interference with third double gear 530. Retaining portion 620 has cutout 624, which is a mark left by cutting away a portion of retaining portion 620 to prevent interference with first double gear 510.

[0028] The pin 630 of the reverse rotation prevention unit 600 is a cylindrical member that fits into a recess 102 located radially outside the second two-stage gear 520 in the housing 100. In this embodiment, the recess 102 is a recess designed for attaching an anti-reverse latch (not shown), and is used to attach the reverse rotation prevention unit 600 instead of the anti-reverse latch.

[0029] Arm member 640 of reverse rotation prevention unit 600 is a rod-shaped member that connects between holding portion 620 and pin 630. Arm member 640 has a notch 644 formed therein, which is the mark left by cutting away a part of arm member 640 in order to prevent interference with first double gear 510.

[0030] According to the electric airsoft gun 10 of the embodiment described above, the one-way clutch 610 can be provided on the rotation shaft 521 of the second double gear 520, which makes it possible to suppress return of the piston 230 caused by backlash between gears, compared to when a one-way clutch (not shown) is provided on the electric motor 300 before the rotation power is reduced in the power transmission mechanism 500. Furthermore, according to the electric airsoft gun 10 of this form, the one-way clutch 610 provided on the rotation shaft 521 of the second double gear 520 can prevent reverse rotation of the power transmission mechanism 500, so operating noise can be reduced compared to when a reverse rotation prevention latch (not shown) is provided on the second double gear 520.

[0031] The technology disclosed in this specification is not limited to the above-described embodiments, examples, and modifications, and can be realized in various configurations without departing from the spirit thereof. For example, among the technical features of the above-described embodiments, examples, and modifications, those corresponding to the technical features of each form described in the Summary of the Invention section can be appropriately replaced and combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, technical features not described as essential in this specification can be appropriately deleted. [Explanation of symbols]

[0032] 10. Electric Airsoft Guns 100 cabinets 102 recess 110 Supply Unit 120 Trigger 210 barrel 220 cylinders 230 piston 235 Rack Gear 240 Spring 300 electric motor 305 output shaft 500 Power Transmission Mechanism 505 pinion gear 510 First double gear 511 Rotation axis 512 bevel gear 514 First Spur Gear 520 Second Double Gear 521 Rotation axis 522 Second Spur Gear 524 Third Spur Gear 530 Third Double Gear 531 Rotation axis 532 4th spur gear 534 5th Spur Gear 600 Reverse prevention unit 610 One-way clutch 612 Through hole 614 Clutch mechanism 620 Holding part 622 Notch 624 Notch 630 pins 640 Arm member 644 Notch

Claims

[Claim 1] An electric airsoft gun that fires spherical bullets using compressed air, a barrel through which the bullet passes; a cylinder connected to the barrel so as to be able to supply the compressed air; a piston configured to be able to reciprocate inside the cylinder between a front side of the cylinder on the barrel side and a rear side of the cylinder on the opposite side from the barrel; a spring that presses the piston toward the front side; a rack gear provided on the piston along a direction in which the piston reciprocates; an electric motor that outputs rotational power that moves the piston toward the rear side; a power transmission mechanism that transmits the rotational power output from the electric motor to the rack gear; a housing that accommodates at least the power transmission mechanism; Equipped with The power transmission mechanism includes: a pinion gear provided on an output shaft of the electric motor; a first double gear including a bevel gear that meshes with the pinion gear and a first spur gear that has fewer teeth than the bevel gear; a second double gear including a second spur gear meshing with the first spur gear and a third spur gear having fewer teeth than the second spur gear; a third double-stage gear including a fourth spur gear that meshes with the third spur gear and a fifth spur gear having teeth that mesh with the rack gear formed over a portion of its circumference, the third double-stage gear being configured to move and hold the piston toward the rear side and to be able to release the piston toward the front side; a reverse rotation prevention unit that prevents reverse rotation of the second double gear; Including, The reverse rotation prevention unit is a one-way clutch that engages with a rotation shaft of the second two-stage gear, allows rotation of the rotation shaft in a forward rotation direction that moves the piston toward the rear side, and prevents rotation of the rotation shaft in a direction opposite to the forward rotation direction; a holding portion that holds the one-way clutch; a pin that fits into a recess that is located on the housing radially outward of the second double gear; an arm member connecting the holding portion and the pin; Including electric airsoft guns.

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