JP3063758U - Transmission of model car - Google Patents

Abstract

(57) [Summary] [Problem] A model capable of shifting from forward to reverse without damaging a gear train or a link without installing a dedicated power source or battery for reverse propulsion. Provide a vehicle transmission device. A model vehicle is provided with power required for forward and backward movements by a small internal combustion engine (22). The transmission device 38 includes a forward / backward torque converter that is shifted under the control of the servo drive shuttle 66. The forward / backward torque transducer includes a shiftable clutch bell 50 and centrifugal closing clutches 52, 60 coupled to the shuttle. Due to the action of the spring-loaded pawl 82 included in the centrifugal closing clutch, the gear change from neutral to reverse or from neutral to forward is performed by the engine 22.
Is performed only when the engine is idling or at a speed less than idling.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a transmission device for a model car (model racing car), and more particularly to a transmission device for a wirelessly controlled model car powered by a small glow plug internal combustion engine.

[0002]

[Prior art]

 Radio controlled model racing cars are used in organizations that make various rules, especially in general hobbies licensed by Radio-Operated Auto Racing Inc. The ones used in the competition include model cars, model airplanes, and model boats. Races using model cars are usually competed on the stages of a race course that forms a closed circuit, making as many laps as possible within the allotted time, and the one with the most laps is the competition Has been the winner. Races sometimes take place outdoors where there are poor road conditions, in which case the pilot must drive the model car carefully avoiding collisions with obstacles. In the event of a collision with an obstacle, the pilot must retreat the model car promptly to avoid the obstacle and allow the race to continue.

[0003] The model car is controlled by a low-output digitally coded radio frequency command signal in items such as steering, direction, forward and backward. Such a command signal is transmitted from a manually operated remote control transmitter. Each model is equipped with a servo mechanism and a radio receiver, and tunes to the same frequency as the transmitter, and the model car turns, accelerates, decelerates, or reverses according to the operator's instructions. Execute.

[0004] The known wirelessly controlled model vehicle is equipped with a portable battery and a DC motor for cranking the internal combustion engine at the time of starting, and also has power for propulsion backward. ing. An internal combustion engine that cannot be inverted only provides power for the model car to move forward. For this reason, when the model vehicle is to be propelled backward, the forward gear is first disconnected, the engine is idled or idled by servo control, and the reverse propulsion can be performed only by the power transmission link and the reverse gear using the DC motor as a power source. Has become.

[0005] The sequence of gearshifts, in which the engine is disconnected and the motor is engaged, is time consuming and undesirably delayed before the model car undergoes a complete reversing movement. In particular, when reversing during high-speed running, gears or transmission links may be damaged. In addition, when shifting in the opposite direction, the operator cannot perform steering control for a while, and the model car is locked in a certain direction until it is switched to the motor drive in the reverse direction. It will be.

[0006]

[Problems to be solved by the invention]

 Therefore, there is a need to provide some simple, quick and reliable means of converting the forward drive torque of a prime mover, for example, a non-reversible torque such as an internal combustion engine or an inertial flywheel motor, into a reverse torque.

[0007] According to such means, a battery or a DC motor for reverse propulsion is not required. Furthermore, if such a means is adapted to a transmission device of a wirelessly controlled model car, the gear train and the link in the transmission will not be damaged, and a smooth shift from forward to reverse is more desirable. Further, it would be more desirable to have a transmission device for a radio-controlled model car that can give the operator an opportunity to practice reversal control when the output torque of the prime mover is shifted from forward to reverse.

Therefore, the present invention can shift without a dedicated power source or battery for propulsion backward without mounting on the vehicle, and can smoothly shift from forward to reverse without damaging gear trains and links. It is an object of the present invention to provide a model car transmission device that can give an operator an opportunity to practice reversal control when output torque is shifted from forward to reverse.

[0009]

[Outline of the invention]

 The above object is achieved by the present invention.

[0010] The wirelessly controlled model vehicle according to the present invention is provided with power required for forward and backward movements by a small internal combustion engine. The transmission includes a forward / reverse torque converter that is shifted under the control of a servo drive shuttle. The forward / reverse torque transducer includes a shiftable clutch bell and a centrifugal closing clutch coupled to the shuttle, and a gear change from neutral to reverse or from neutral to forward requires that the prime mover (internal combustion engine) be idle or below idle. This can only be done when rotating at speed. Since the gear change is not performed when the engine is running at a speed higher than the idling speed, it is possible to avoid vibration loads when the drive is connected and damage to the transmission device and its parts.

According to an embodiment of the present invention, the centrifugal force closing clutch includes a single spring-loaded pawl, and the pawl is brought into contact with the clutch housing so that when the engine is rotating at a predetermined idling speed or higher. To prevent clutch connection. When the engine is running at or below idling speed, the pawl is retracted to a position where it does not interfere with the action of the bias compression spring. When the rotation of the engine accelerates and exceeds the idling speed, the inertial force due to the centripetal acceleration overcomes the bias force of the compression spring, and the pawl extends radially outward and makes interference contact with the clutch housing. That is, the extension movement of the shuttle and the mechanical connection between the clutch bell and the clutch are avoided by the interference contact of the pawl extended by the inertia force with the clutch housing when the engine is rotating at a speed higher than the idling speed. You. When the engine speed drops below idling speed, the bias spring moves the pawl from the closed position of the shift to a position where it does not interfere, allowing the shuttle to extend and the clutch to be connected automatically. State.

According to another embodiment of the present invention, the centrifugal closing clutch includes a pair of spring-loaded pivot shoes. When the engine is idling, these shoes are held in the retracted position (non-interference position) by the torsional force of the spring. When the engine accelerates and exceeds the idling speed, the inertial force generated by the centripetal acceleration overcomes the retracting force of each spring, and the shoe extends radially outward, causing interference with the clutch housing. Make contact. This prevents shift movement of the clutch bell in the axial direction, thereby avoiding engagement of the clutch.

According to the above two embodiments, the clutch is connected to the forward gear or the reverse gear, or the neutral or neutral position, in relation to the relative positions of the clutch bell and the stop device using inertia such as a shoe / claw. It is determined whether the position is sealed. If the clutch bell is not stationary beyond the shoe or pawl and the engine is running at or above idling, radial extension of the shoe / pawl will cause the shuttle and clutch bell to shift axially. Seal. As a result, when the engine is running at speeds above idle, forward to reverse or reverse to forward gear changes are not allowed.

[0014]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a model racing car 10 (model car) is provided with front steered wheels 12 and 14 and rear drive wheels 16 and 18 on a chassis 20. The model vehicle 10 uses a small-sized combustion-type internal combustion engine 22 as a power source. The internal combustion engine 22 is a fractional horsepower engine using a glow plug and having a displacement of 0.12 cc.

Referring to FIGS. 2 and 3, rear drive wheels 16, 18 are connected to axle portions 24A, 24B of a mechanically rotatable drive axle 24. The drive axle 24 is configured to be rotatable clockwise or counterclockwise in order to propel the model car in the forward or backward direction.

The engine 22 has an output capable of increasing the speed of the model car to 35 mph. The output torque generated by the engine 22 is output from the output shaft 26. As shown in FIG. 2, the mounted DC motor 28 is connected to the shaft 26 via a pinion gear 30, an idler gear 32 and a spur gear 34 to start the engine 22. In such a configuration, the engine 22 includes a glow plug connector 36, which is connected to an external DC power supply, together with the DC motor 28, for cranking or starting the engine 22. Have been. After the engine is started, the external power supply is cut off, and the model car 10 is thereafter supplied with power only by the internal combustion engine 22. Since the operation of the internal combustion engine 22 is not reversible, the model vehicle 10 does not need to carry a portable battery pack that supplies power to the DC motor 28. As a result, the model car is driven forward and backward only by the internal combustion engine 22 after the start.

The rotational output from the internal combustion engine 22 is transmitted to a rotatable drive axle 24 via a transmission assembly 38. Referring to FIGS. 2 and 3, the rotational output torque generated in internal combustion engine 22 is transmitted to transmission assembly 38 via pinion gear 40 driving spur gear 42. The spur gear 42 is connected to a torque transmission shaft 44 that rotates about a vertical axis A. The rotational torque transmitted to the torque transmission shaft 44 via the spur gear 42 is transmitted to the drive axle 24 via the forward drive gear 46 or the reverse drive gear 48. Whether the rotational torque is transmitted via the forward drive gear 46 or the rotational torque is transmitted via the reverse drive gear 48 is selectively determined according to the position of the clutch bell 50.

The forward drive gear 46 and the reverse drive gear 48 are firmly connected to opposite ends of the torque transmission shaft 44. Thus, as described above, the rotational output of the internal combustion engine 22 can be transmitted simultaneously via either the forward drive gear 46 or the reverse drive gear 48 determined according to the position of the clutch bell 50.

Referring to FIG. 2, the rotational output torque generated by internal combustion engine 22 is selectively converted to forward drive torque by one-way forward clutch 52 and forward crown gear 54 connected to forward clutch 52. Is converted. The crown gear 54 and the one-way forward clutch 52 are free to rotate with respect to the drive axle 24 except when the clutch bell 50 is engaged with the forward clutch 52. As shown in FIG. 4, when the forward gear is engaged, a shaft insert collar 56 (see FIG. 10) mounted on the clutch bell 50 is used for each sliding of the pivotal clutch. Engages with the child 58 (see FIG. 7B). Thus, the crown gear 54, the forward clutch 52, and the clutch bell 50 are mechanically connected to the rotary drive axle 24 in the forward drive state. A pair of stoppers 50G are formed on the side walls of the concave spaces 50A, 50B of the clutches 52, 60 in the holding state.

When the model car 10 is driven forward, the clockwise output torque of the engine 22 is transmitted through the torque transmission shaft 44 by the idler gear 64 meshing with the forward drive pinion 46 and the forward crown gear 54. 24. With this arrangement, clockwise rotation of the torque transmission shaft 44 is converted to counterclockwise rotation of the drive axle 24 and the driven wheels 16, 18, thereby causing forward (F) rotation of the drive wheels.

The rotational output torque generated by the internal combustion engine 22 is selectively converted to reverse drive torque by the one-way reverse clutch 60 and the crown gear 62 connected to the reverse clutch 60. In the case of the reverse propulsion operation, the clockwise output torque of the engine 22 is transmitted to the drive axle 24 via the torque transmission shaft 44 by the direct connection of the reverse drive pinion 48 and the reverse crown gear 62. One-way reverse clutch 60 and crown gear 62 are free to rotate relative to drive axle 24 except when clutch bell 50 is engaged with reverse clutch 60.

As shown in FIG. 6, when the reverse gear is engaged, the shaft insert collar 56 (see FIG. 9) mounted on the clutch bell 50 is connected to each of the sliders 58 (see FIG. 7B) of the pivotal clutch. See). As a result, the reversing crown gear 62, the reverse clutch 60, and the clutch bell 50 are releasably connected to the rotary drive axle 24, and the reverse drive coupling state is established. The output torque of the engine 22 is reversed by the drive pinion 48 meshed with the reverse crown gear 62. With such an arrangement, the counterclockwise rotation of the torque transmission shaft 44 is converted into a clockwise rotation of the drive axle 24 and the driven wheels 16, 18, thereby causing the drive wheels to retreat (R). .

Referring to FIGS. 2, 4, 5 and 6, the clutch bell 50 can slide along the drive axle 24 to reach the forward drive position (FIG. 4) where it is one-way. It is coupled to the forward clutch 52 and transmits clockwise torque to the drive axle 24 (forward direction). It can also slide to reach the reverse drive position (FIG. 6), where it can be engaged with the one-way reverse clutch 60 to transmit counterclockwise torque to the drive axle 24 (reverse direction). The clutch bell 50 is shifted along the drive axle 24 by a shuttle 66 operated by a servo mechanism. The shuttle 66 slides back and forth along a guide rail 68 and is attached to the clutch bell 50 by a shift arm 70.

The shuttle 66 is driven by a servo 72 operated by a battery. The servo 72 has a rotary actuator arm 74. The shuttle 66 and the rotary actuator arm 74 are connected by a link arm 76. Actuator arm 74 shifts shuttle 66 and clutch bell 50 between an advanced position, a neutral position, and a retracted position. The shift operation is performed in response to a radio frequency instruction signal received and digitally encoded by the high frequency multi-channel receiver 78. The receiver 78 decodes the radio command signal and outputs an analog control signal (forward, neutral, reverse) to the servo 72 via the multi-conductor cable 80.

In such an embodiment, the forward clutch 52 and the reverse clutch 60 are provided with pawls 82 and 84, respectively, which are biased by springs, and only when the internal combustion engine 22 is rotating at an idling speed or at or below the idling speed. Allows a gear change from neutral to reverse, or from neutral to forward. By avoiding gear change when the engine is rotating at a speed higher than the idling speed in such a configuration, a shock load is generated at the time of connection, and the transmission assembly 38 and its constituent gears are damaged. Can be prevented.

2, 7 and 8, when the engine is running at or below idling speed, the pawl 82 is moved to a position where it does not interfere by the force of the bias compression spring 85. It is retracted. When the engine speed rpm increases and becomes equal to or higher than the idling speed, the force generated by the centripetal acceleration overcomes the bias force of the compression spring 85, and the claw 82 rotates around the pivot pin 86, and moves radially outward. (Extends to the position shown by the dotted line) and makes interference contact with the housing surface 50F of the clutch bell 50. In other words, the shifting extension of the shuttle 66 and the mechanical connection between the clutch bell 50 and the forward clutch 52 are performed when the engine is rotating at an idling speed or higher. ) Is avoided by interfering with the plurality of stoppers 50G formed on the clutch housing surface 50F. When the engine speed falls below the idling speed, the centripetal force disappears, and the bias spring 85 urges the pawl 82 from the blocking position (the position indicated by the dotted line) to the non-interference position (FIG. 7 (A)).

In the other embodiment shown in FIGS. 11 to 16, each centrifugal closing clutch includes a pair of pivoted pivot shoes 88, 90.

The contents of the present invention are not limited to the above-described embodiment, and those skilled in the art can make appropriate modifications without departing from the spirit of the present invention.

[0030]

[Effect of the invention]

 As described above, according to the present invention, it is possible to shift without a dedicated power source or battery for propelling the vehicle backward, and smoothly move from forward to reverse without damaging the gear train and the link. It is possible to provide a transmission device for a model car that can shift, and when the output torque is shifted from forward to reverse, gives the operator an opportunity to practice reversal control.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a model vehicle that is wirelessly controlled using a small internal combustion engine as a power source.

FIG. 2 is an electro-mechanical configuration block diagram schematically showing configurations of a servo mechanism and a gear train assembly.

FIG. 3 is a perspective view showing a forward / reverse transmission device according to an embodiment of the present invention;

FIG. 4 is a plan view showing a state where the clutch bell is coupled in a forward direction.

FIG. 5 is a plan view showing a state where the clutch bell is placed at a neutral position.

FIG. 6 is a plan view showing a state in which the clutch bell is coupled in a backward direction.

7A is a front view showing a part of a one-way clutch having a rotatable spring-loaded claw, and FIG. 7B shows an example of a pivot of the one-way clutch shown in FIG. It is a partial sectional view.

FIG. 8 is a right side view showing a form of a one-way clutch and a claw with a spring.

FIG. 9 is a sectional view showing the clutch bell shown in FIG. 2;

FIG. 10 is a right side view of the clutch bell shown in FIG. 9;

FIG. 11 is a perspective view showing a transmission device including a rotatable one-way clutch using a closing shoe with a spring according to another embodiment of the present invention.

FIG. 12 is a plan view showing a state where the clutch bell is shifted and connected in the retreating direction.

FIG. 13 is a plan view showing a state where the clutch bell is shifted to a neutral idle position.

FIG. 14 is a plan view showing a state where the clutch bell is shifted and connected in the forward direction.

FIG. 15 is a front view showing a centrifugal force closing clutch showing the closing shoe with spring;

FIG. 16 is a right side view showing the centrifugal force closing clutch in a partial cross section.

[Description of Signs] 10 ... Model car, 12, 14 ... Front steering wheel 16, 18 ... Rear drive wheel, 22 ... Internal combustion engine 24 ... Drive axle, 26 ... Output shaft 28 ... DC motor, 38 ... Transmission assembly 44 ... Torque transmission shaft, 46: forward drive gear 48: reverse drive gear, 50: clutch bell 50A, 50B: concave space, 50G: stopper 52: one-way clutch (second one-way clutch) 54: forward crown gear (first 58: Slider of pivot clutch 60: One-way reverse clutch (first one-way clutch) 62: Reverse crown gear (first crown gear) 64: Idler gear, 66: Shuttle 70: Shaft arm, 72 ... Servo 76 ... Link arm, 82 ... Claw 85 ... Bias spring, 86 ... Pivot pin 8,90 ... pivot shoes

Claims (5)

[Utility model registration claims] 1. A chassis (20), a drive axle (24) mounted on the chassis (20) and rotating clockwise and counterclockwise; and the drive axle (24). A single internal combustion engine (12, 14, 16, 18) coupled to opposite ends of the vehicle and having first and second drive wheels (12, 14, 16, 18) for propelling the vehicle in a forward or reverse direction, and a rotating output shaft (26); 22) and a set of transmission assemblies (38) connected to the rotating output shaft (26) and transmitting engine torque to the drive axle (24). A first one-way clutch (60) mounted on the drive axle (24) and transmitting torque only in a clockwise direction; and coupled to the first clutch (60). A first crown gear (62), a second one-way clutch (52) attached to the drive axle (24) and transmitting torque only in a counterclockwise direction, and coupled to the second clutch (52). A second crown gear (54), interposed between the first and second clutches (52, 60), coupled to the drive axle (24) so as to be able to transmit torque, and the drive axle ( 24) and can be slid to a forward drive position, in which the first clutch (60) is coupled to transmit torque to the drive axle (24) in a clockwise direction while the reverse drive is being performed. One clutch bell (50) coupled to the second clutch (52) and transmitting torque counterclockwise to the drive axle (24) at the reverse drive position.
One torque transmission shaft (44) mounted on the chassis (20) and rotating about its axial direction; coupled to the torque transmission shaft (44), and the first crown gear (62); A first pinion gear connected to convert torque, a second pinion gear connected to the torque transmission shaft (44), and an idler connected to the second pinion gear and the second crown gear so as to be capable of driving and driving. A gear and a servo device (72) coupled to the clutch bell (50) for sliding the clutch bell (50) along the drive axle (24) between the forward drive position and the reverse drive position; The engine (22) is movably coupled to the first and second clutches (52, 60), and is operating at or above a predetermined idle speed. Come to, and extends radially model vehicle transmission device which comprises a an inertial closure device into the sealed position preventing reversal of the gear. 2. The first one-way clutch and the second one-way clutch each include a spring-loaded claw (82, 8).
4), wherein the clutch bell has a concave space (50).
A, 50B) are formed so as to be freely connectable to the respective clutches, and one or more stoppers (50G) to be connected to the spring-loaded pawls are provided on the side wall of each concave space holding each clutch. 3. The transmission of a model car according to claim 1, wherein 3. Each of the spring-equipped pawls provided on each of the clutches has one end extending outwardly with respect to the stopper of the crankbell when the engine is rotating at an idling speed or higher. , One pawl rotating about a pivot pin, and an adjustable bias spring set for moving said pawl out of the closed position when the engine is running at a speed less than idling speed. The transmission of a model car according to claim 2, characterized in that: 4. The first one-way clutch and the second one-way clutch each include a pair of spring-loaded pivot shoes connected to the clutch bell. The transmission of a model car according to claim 1, including a plurality of concave spaces so that the spaces can be combined. 5. The method according to claim 1, wherein each of the first one-way clutch and the second one-way clutch includes a one-way bearing so as to be able to be coupled to one torque transmitting coupler. The transmission device of the model car described in the above.