JP7485319B1 - Electric airsoft gun - Google Patents

Abstract

[Problem] To suppress return of a piston caused by backlash between gears in an electric airsoft gun. [Solution] An electric airsoft gun includes a cylinder, a piston, a spring, a rack gear provided on 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 holding part that holds the one-way clutch, a pin that fits with a recess located on the radial outside of the second double-stage gear in the housing, and an arm member that connects between the holding part and the pin. [Selected Figure] Figure 1

Description

This specification discloses technology related to electric airsoft guns.

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

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.

JP 2006-234191 A Japanese Patent No. 6620956

In an electric airsoft gun, when a reverse lock latch is provided on the gear of the power transmission mechanism, there is a problem that the piston moves forward by the amount of backlash (gap) between the gears between the reverse lock latch and the piston . In addition , when a reverse lock latch is provided on the gear of the power transmission mechanism, there is a problem that the operating noise of the reverse lock latch is generated, which interferes with play.

In addition, 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 moves back forward by an amount equal to the backlash of the gear between the output shaft and the piston.

The technology disclosed in this specification can be realized in the following forms:

One embodiment disclosed in this specification is an electric airsoft gun that fires a spherical bullet by compressed air. This electric airsoft gun includes a barrel through which the bullet passes; a cylinder connected to the barrel so as to be able to supply the compressed air to the barrel; a piston configured to be able to reciprocate inside the cylinder between the front side of the cylinder on the side of the barrel and the rear side of the cylinder on the opposite side to the barrel; a spring that presses the piston toward the front side; a rack gear that is provided on the piston along the direction in which the piston reciprocates; an electric motor that outputs a rotational force that moves the piston toward the rear side; a power transmission mechanism that transmits the rotational force 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 an 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 a portion 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 fits with the rotating shaft of the second two-stage gear, allows the rotating shaft to rotate in a forward direction that moves the piston to the rear side, and prevents the rotating shaft from rotating in a direction opposite to the forward rotation direction; a holding part that holds the one-way clutch; a pin that fits with a recess located radially outside the second two-stage gear in the housing; and an arm member that connects the holding part and the pin. According to this form of electric airsoft gun, a one-way clutch can be provided on the rotating shaft of the second two-stage gear, so that the return of the piston due to backlash between the gears can be suppressed compared to when a one-way clutch is provided on the electric motor before the rotational power is reduced by the power transmission mechanism. In addition, according to this form of electric airsoft gun, the one-way clutch provided on the rotating shaft of the second two-stage gear can prevent reverse rotation of the power transmission mechanism, so that the operating noise can be reduced compared to when a reverse rotation prevention latch is provided on the gear.

The technology disclosed in this specification can be realized in various forms other than electric airsoft guns. For example, the technology disclosed in this specification can be realized in the form of parts and manufacturing methods for electric airsoft guns.

FIG. 1 is an explanatory diagram showing the configuration of an electric airsoft gun. FIG. 4 is an explanatory diagram showing a detailed configuration of a reverse rotation prevention unit.

Figure 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 comprises 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.

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 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, etc. for fixing various components.

The resupply unit 110 of the electric airsoft gun 10 resupplies a new bullet BB to the barrel 210 each time a bullet BB is fired from the barrel 210.

The trigger 120 of the electric airsoft gun 10 is a switch that accepts 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 backward and enters a firing standby state in which it waits to fire a bullet BB. When the trigger 120 is then pulled to its maximum movable range, the electric airsoft gun 10 releases the piston 230 in the cylinder 220 forward, and fires a bullet BB with compressed air generated in the cylinder 220.

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. The 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.

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.

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 side of the barrel 210 and the rear side of the cylinder 220 on the opposite side of the barrel 210. A rack gear 235 is provided on the outside of the piston 230 in the direction in which the piston 230 reciprocates.

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.

The electric motor 300 of the electric airsoft gun 10 outputs rotational power that moves the piston 230 rearward. The electric motor 300 operates based on an operational input to the trigger 120. The electric motor 300 has an output shaft 305 that outputs the rotational power.

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 two-stage gear 510, a second two-stage gear 520, a third two-stage gear 530, and a reverse rotation prevention unit 600.

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.

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 first double gear 510 has the rotating shaft 511, the bevel gear 512, and the first spur gear 514 integrally formed therewith. 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 number of teeth of the bevel gear 512 is 40, and the number of teeth of the first spur gear 514 is 10.

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 rotation prevention unit 600. The second spur gear 522 is a gear that meshes with the first spur gear 514 in 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 number of teeth of the second spur gear 522 is 40, and the number of teeth of the third spur gear 524 is 20.

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 third double gear 530 has the rotating shaft 531, the fourth spur gear 532, and the fifth spur gear 534 integrally formed therewith. 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 in the second double gear 520. The fifth spur gear 534 is a gear with teeth formed on a part of the circumference that meshes 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 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.

Figure 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 two-stage 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.

The one-way clutch 610 of the reverse rotation prevention unit 600 is a cylindrical member that transmits rotational power in only one direction. The one-way clutch 610 has a through hole 612 and a clutch mechanism 614. The through hole 612 fits onto the rotating shaft 521 of the second two-stage gear 520. The inner peripheral surface of the through hole 612 is provided with a clutch mechanism 614 that can rotate in only one direction. The one-way clutch 610 allows the rotating shaft 521 to rotate in the forward rotation direction that moves the piston 230 rearward, and prevents the rotating shaft 521 from rotating in the opposite direction to the forward rotation direction.

The holding portion 620 of the reverse rotation prevention unit 600 is a portion that holds the one-way clutch 610. The holding portion 620 holds the one-way clutch 610 by fitting onto the outside of the one-way clutch 610. The holding portion 620 has a notch 622 that is a trace of a portion of the holding portion 620 being cut away to prevent interference with the third two-stage gear 530. The holding portion 620 has a notch 624 that is a trace of a portion of the holding portion 620 being cut away to prevent interference with the first two-stage gear 510.

The pin 630 of the reverse rotation prevention unit 600 is a cylindrical member that fits into the 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 mounting a reverse rotation prevention latch (not shown), and is used to mount the reverse rotation prevention unit 600 instead of the reverse rotation prevention latch.

The arm member 640 of the reverse rotation prevention unit 600 is a rod-shaped member that connects the holding portion 620 and the pin 630. The arm member 640 has a notch 644 formed therein, which is the mark left by cutting out a part of the arm member 640 to prevent interference with the first two-stage gear 510.

According to the embodiment of the electric airsoft gun 10 described above, the one-way clutch 610 can be provided on the rotating shaft 521 of the second two-stage gear 520, so that the return of the piston 230 caused by backlash between the gears can be suppressed compared to the case where a one-way clutch (not shown) is provided on the electric motor 300 before the rotational power is decelerated by the power transmission mechanism 500. In addition, according to this form of electric airsoft gun 10, the one-way clutch 610 provided on the rotating shaft 521 of the second two-stage gear 520 can prevent reverse rotation of the power transmission mechanism 500, so that the operating noise can be reduced compared to the case where a reverse rotation prevention latch (not shown) is provided on the second two-stage gear 520.

The technology disclosed in this specification is not limited to the above-mentioned embodiments, examples, and modifications, and can be realized in various configurations without departing from the spirit of the invention. For example, among the technical features in the above-mentioned embodiments, examples, and modifications, those that correspond to the technical features in each form described in the Summary of the Invention column can be replaced and combined as appropriate to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, technical features that are not described in this specification as essential can be deleted as appropriate.

10 Electric airsoft gun 100 Housing 102 Recess 110 Supply unit 120 Trigger 210 Gun barrel 220 Cylinder 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 Rotating shaft 512 Bevel gear 514 First spur gear 520 Second double gear 521 Rotating shaft 522 Second spur gear 524 Third spur gear 530 Third double gear 531 Rotating shaft 532 Fourth spur gear 534 Fifth spur gear 600 Reverse prevention unit 610 One-way clutch 612 Through hole 614 Clutch mechanism 620 Holding portion 622 Notch 624 Notch 630 Pin 640 Arm member 644 Notch

Claims (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 capable of supplying the compressed air;
A piston that is configured to be able to reciprocate inside the cylinder between a front side of the cylinder on the side of the gun barrel and a rear side of the cylinder on the opposite side of the gun 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 for moving 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 an output shaft of the electric motor;
a first double gear including a bevel gear meshing with the pinion gear and a first spur gear having a smaller number of 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 a smaller number of teeth than the second spur gear;
a third double gear including a fourth spur gear meshing with the third spur gear and a fifth spur gear having teeth meshing with the rack gear over a portion of its circumference, the third double gear being configured to move and hold the piston toward the rear side and to release the piston toward the front side;
a reverse rotation prevention unit that prevents reverse rotation of the second double gear;
The reverse rotation prevention unit includes:
a one-way clutch that engages with a rotation shaft of the second two-stage gear and allows the rotation of the rotation shaft in a forward rotation direction that moves the piston toward the rear side and prevents the 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;
and an arm member connecting the holding portion and the pin.

Images