JP2010065709A - Continuously variable automatic transmission mechanism and self-advancing model vehicle having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuously variable automatic transmission mechanism optimum for the case in which a constitution of a low output power source and a simple mechanism is demanded as in a self-advancing model vehicle. <P>SOLUTION: The continuously variable automatic transmission mechanism has a pulley member formed by a pair of opposed half pulleys 4, 6 on an input shaft 2 for inputting the power of a motor 1 and includes an input-side slide regulating means 60, 7a for regulating at least the half pulley 6 to slide within a predetermined range only in a direction parallel to the axial direction of the input shaft. A half pulley 13 in a pulley member on an output shaft 10 includes an output-side slide regulating means 130, 12a for regulating itself to slide within predetermined ranges in the axial direction and in the rotational direction. The continuously variable automatic transmission mechanism performs such speed-changing actions that when the output shaft is under a low load, a half-pulley spacing on the input side is small and a half-pulley spacing on the output side is large and when the output shaft is under a high load, the half-pulley spacing on the input side is large and the half-pulley spacing on the output side is small. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a continuously variable automatic transmission mechanism that changes speed with an input shaft according to a load on an output shaft, and a self-propelled model vehicle equipped with the mechanism, and more specifically, an input shaft and an output shaft. It relates to the structure of the pulley provided respectively.

2. Description of the Related Art As a transmission mechanism that changes a gear ratio between an input shaft and an output shaft, a continuously variable transmission mechanism that performs a stepless transmission by stretching a belt around a pulley and changing the diameter of the pulley is known.
In particular, various methods have been proposed in a configuration for transmitting large power such as automobiles and industrial machines.

For example, in Patent Document 1, two pulley shafts arranged in parallel at a predetermined interval, a movable sheave arranged on each pulley shaft and capable of sliding on the pulley shaft in the axial direction, A fixed sheave that is arranged on the pulley shaft so as to face each of the movable sheaves and that forms a groove with the movable sheave, and a belt that is wound around each groove in each of the movable sheaves and the fixed sheave that are arranged to face each other. An arrangement comprising the above is disclosed.
According to this disclosure, it has been proposed to provide a plurality of independently controllable actuators capable of determining the axial position of the movable sheave in this configuration.

  As described above, many of the conventional technologies are equipped with a complicated control mechanism in order to achieve an optimum gear ratio, but on the other hand, most automatic transmission mechanisms that can be easily and inexpensively mounted on toys such as radio controlled cars are proposed. It has not been.

Among them, Patent Document 2 is cited as a proposal by the present applicants.
According to this disclosure, when the rotary output shaft is unloaded or lightly loaded, the slide half pulley on the power output shaft positions the pulley state of the variable pulley unit to the maximum value of the minimum width pulley variable range by strong pressurization of the coil spring. The pin provided on the slide pulley protrusion remains in the vicinity of the apex of the speed change cam triangular hole.
The slide half pulley on the rotary output shaft is weaker than the coil spring that pressurizes the slide half pulley on the power output shaft. The pulley is positioned at the minimum value of the maximum width pulley variable range and the pin provided on the slide half pulley projection remains in the high speed rotation state while remaining near the apex of the shifting cam triangular hole.

In this configuration, a coil spring with a large spring constant must be used. As a result, the frictional force between the pulley and the belt becomes excessive, resulting in a large power transmission loss. was there.
The pulley can slide smoothly regardless of the direction of rotation by moving the pin along the side of the triangular hole for shifting cam. On the other hand, it must be pressurized with a strong coil spring so that the interval between the pulleys does not open during high-speed rotation. It was.

JP 2005-308064 JP JP 2005-061606 JP

  The present invention was created in view of the above-described problems of the prior art, and is optimal when the output of the power source is small and the mechanism itself is required to have a simple configuration like a self-propelled model vehicle. An object is to provide a continuously variable automatic transmission mechanism.

The present invention uses the following means in order to solve the above problems.
That is, the invention according to claim 1 uses a pulley body formed by using a region between opposing surfaces of a pair of opposed half pulleys that are coaxially supported as a groove, and an input side pulley body and an output on the input shaft. Provided is a continuously variable automatic transmission mechanism in which one output-side pulley body is disposed on a shaft and a belt is stretched between the input-side pulley body and the output-side pulley body.

The facing surface of at least one half pulley in each pulley body is a tapered surface with a space between the opposing half pulleys toward the center of each axis, and at least one half pulley of the input side pulley body is in the axial direction of the input shaft. An input side sliding restricting means for restricting sliding within a predetermined range only in a parallel direction is provided.
Further, when at least one half pulley of the output side pulley body slides in the axial direction of the output shaft and the interval between the half pulleys becomes small, the half pulley can be rotated within a predetermined range in the rotation direction of the output shaft at the same time. An output-side sliding restricting means for restricting the output is provided.

  Each elastic means for generating a predetermined attractive force between the input and output half pulleys is provided. When the output shaft is under low load, the input half pulley interval is small and the output half pulley interval is large. On the other hand, when the output shaft is heavily loaded, the input half pulley interval is large, and the output side half pulley interval is small.

  According to a second aspect of the present invention, the configuration of the input side sliding restricting means includes an engaging member that is externally fitted to the input shaft and operates integrally with the half pulley, and the axial direction of the input shaft is provided on the engaging member. Is provided with either an engaging groove or an engaging slit that is parallel to the engaging shaft, and an engaging protrusion that engages with the engaging groove or the engaging slit on the input shaft. .

According to a third aspect of the present invention, the configuration of the output side sliding restricting means includes an engaging member that is externally fitted to the output shaft and operates integrally with the half pulley, and the engaging member is provided with the engaging portion. On the other hand, the output shaft is provided with an engaging convex portion that engages with the engaging portion.
The engaging portion has a substantially triangular shape. When the output-side half pulley interval is maximized, the engaging convex portion is positioned at one vertex, and when the half-pulley interval changes to a small value, The engaging projection slides along the side, and is formed so as to reach the other apex of each side when the half pulley interval is minimized.

The above is a configuration in which sliding in the rotational direction is performed on the output shaft side, but the present invention may be slid on the input shaft side.
That is, in the invention according to claim 4, when at least one half pulley of the input side pulley body slides in the axial direction of the input shaft and the interval between the half pulleys becomes large, the rotation of the output shaft is simultaneously reversed. It is the structure which has the input side sliding regulation means which regulates so that a half pulley can rotate within a predetermined range.
The output side pulley body has an output side sliding restricting means for restricting at least one half pulley of the output side pulley body to slide within a predetermined range only in a direction parallel to the axial direction of the output shaft.

  In this configuration, each elastic means for generating a predetermined attractive force between the input and output half pulleys is provided. When the output shaft is under a low load, the input half pulley interval is small and the output half pulley interval is large. On the other hand, when the output shaft is heavily loaded, the input half pulley interval is large, and the output side half pulley interval is small.

  According to a fifth aspect of the present invention, the output-side sliding restricting means includes an engaging member that is externally fitted to the output shaft and operates integrally with the half pulley, and is parallel to the axial direction of the output shaft. Either an engaging groove or an engaging slit is provided, and an engaging convex portion that engages with the engaging groove or the engaging slit is provided on the output shaft.

According to a sixth aspect of the present invention, the input-side sliding restricting means includes an engaging member that is externally fitted to the input shaft and operates integrally with the half pulley, and the engaging member is provided with an engaging portion. The input shaft is provided with an engaging convex portion that engages with the engaging portion.
The engaging portion has a substantially triangular shape, and when the half pulley interval on the input side is minimized, the engaging convex portion is positioned at one apex, and when the half pulley interval changes greatly, the engagement portion is either in accordance with the rotation direction. The engaging convex portion slides along the side of each side, and is formed so as to reach the other vertex of each side when the half pulley interval becomes maximum.

  The present invention can also be provided as a model vehicle equipped with the continuously variable automatic transmission mechanism. The model vehicle is a model vehicle that can be self-propelled by the mounted power means, and includes at least one of power means for generating rotational power, an input shaft connected to the power means, and one or a plurality of wheels. An output shaft that supports the shaft and a continuously variable automatic transmission mechanism that performs a speed change operation between the input shaft and the output shaft are provided.

According to the present invention, in the continuously variable automatic transmission mechanism, the input side pulley body restricts the input side pulley body to slide within a predetermined range only in the direction parallel to the axial direction of the input shaft, and the output side When the pulley body slides in the axial direction of the output shaft and the interval between the half pulleys becomes small, the output side sliding that restricts the rotation direction of the output shaft so that the half pulley can be rotated within a predetermined range. By providing the restricting means, there is no sliding in the rotation axis direction on the input shaft, so that the half pulley interval does not open and malfunctions, and transmission loss can be suppressed.
As a result, the coil spring that regulates the interval between the half pulleys does not need to be pressed strongly, and only needs to be provided to determine the initial position of the half pulley, so friction between the half pulley and the belt can be minimized and transmission loss can be greatly reduced. Can be reduced.

Moreover, in the structure of Claim 2, 5, it is possible to regulate a suitable sliding range with an engagement groove or an engagement slit, and it contributes also to the simplicity of an assembly and cost reduction.
In the configurations of claims 3 and 6, by forming a triangular shape, it is possible to achieve good regulation of the sliding range on each side, and it is possible to cope with any rotation direction, and further, ease of assembly and low It also contributes to cost reduction.

  In the model vehicle in which the configuration of claims 7 and 8 is particularly required to be small and lightweight, and a continuously variable automatic transmission mechanism capable of effectively transmitting small power is required, the present invention satisfies these requirements. This is preferable because the speed change operation can be performed in any traveling direction.

Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. The embodiment is not limited to the following.
(First embodiment)
FIG. 1 is a perspective view of a continuously variable automatic transmission mechanism according to the present invention. A small motor (1) driven by a battery (not shown) is used as a power source, and the rotational power of the motor is input from the input shaft (2).
In addition to the motor, a power source suitable for mounting on a model vehicle such as a small model engine can be used.

The input shaft (2) is pivotally supported by input shaft bearings (3) and (3), and a fixed half pulley (4) is first fitted on the input shaft. The fixed half pulley (4) is fixed to the input shaft (2) by a fixing pin (5).
The shape of the fixed half pulley (4) is as shown in the left side view (a) and front view (b) of FIG. 3, and the cylindrical shaft portion (4a) and the substantially disc-shaped face portion (4b) are integrated. Formed.

  A shaft hole (40) for insertion into the input shaft is provided at the center, and the screw hole (41) of the fixing pin (5) to be tightened with a screw from the outer peripheral surface of the shaft portion (4a) is formed in the shaft hole (40). It is open towards.

The face portion (4b) is a flat plate on the back side, but a tapered portion (42) is formed on the front side, and is inclined so that the thickness of the face portion (4b) becomes thinner toward the outer periphery. . The vicinity of the shaft hole (40) is a flat plate portion (43).
In the present invention, since the front face sides of the face portions are installed facing each other, this surface is called an opposing surface.

  That is, a sliding half pulley (6) whose direction is reversed is fitted on the input shaft (2) following the fixed half pulley (4). The shape of the sliding half pulley (6) may be the same as that of the fixed half pulley (4), and the sliding half pulley (6) is rotatably inserted so that the tapered portion (42) and the flat plate portion (43) face each other.

In the screw hole of the sliding half pulley (6), the engaging pin (60) protrudes toward the outer peripheral side instead of the shaft side as in the fixed half pulley (4) to form a convex portion. In the present embodiment, the shaft member (6b) of the sliding half pulley (6) and the engaging pin (60) attached thereto constitute the engaging member of the present invention.
The engaging member and the face portion of the half pulley are not necessarily integrally molded, and another member may be bonded to rotate integrally.

  A shift cam (7) is fitted on the shaft portion (6b) of the sliding half pulley (6), and an engagement pin (60) is engaged with an engagement slit (7a) provided in the shift cam (7). Are engaged. Since the shifting cam (7) is fixed to the input shaft (2) by the fixing pin (70), the sliding half pulley (6) eventually moves only within the range restricted by the engagement slit (7a). Can do.

Since the engagement slit (7a) is provided with a width parallel to the input shaft and adapted to the outer diameter of the engagement pin (60), the sliding half pulley (6) is slidable in the input shaft direction. In the rotation direction, it only rotates according to the input shaft.
As described above, in this embodiment, the engagement member and the shift cam (7) constitute the input side sliding restricting means.

  In the implementation of the present invention, a slit parallel to the axial direction is provided on the input shaft without using the speed change cam, and the protrusion provided on the shaft side of the sliding half pulley is engaged with the slit. You may regulate so that it may slide only to a direction. At this time, the slit may be extended to at least one end of the input shaft so that the sliding half pulley can be easily inserted, and another member may be provided on the shaft after the insertion to restrict the sliding range.

  A first coil spring (71) for pressing the sliding half pulley (6) toward the fixed half pulley (4) with a first pressure is provided in the speed change cam (7). The coil spring is in contact with the shifting cam (7) with one end fixed, and the other end is in contact with the shaft portion (6b) of the sliding half pulley. When there is no load, the repulsive force of the spring causes the engagement slit (7a) At the end of the sliding half pulley (6), the spring is compressed and contracts to the opposite end of the engagement slit (7a) (the point at which the interval between the half pulleys is maximized) when the load exceeds a predetermined load.

On the other hand, an output shaft (10) is provided at a position parallel to the input shaft (2) and separated by a predetermined distance, and is supported by output shaft bearings (11) and (11).
In the output shaft (10), the output side shifting cam (12), the output side sliding half pulley (13), and the output side fixed half pulley (14) are fitted in the order symmetrical to the input shaft side.

As for the output shaft, the engagement pin (130) provided on the output-side sliding half pulley (13) engages with the engagement window (12a) provided on the output-side speed change cam (12). It is regulated to be slidable only in
Since the other members are the same in configuration, description thereof will be omitted. However, a second coil spring (not shown) is provided in the output side shifting cam (12) so that the output side sliding half pulley (13) is connected to the output side. Press toward the fixed half pulley. The output side fixed half pulley (14) is fixed to the output shaft (10) by a fixing pin (15).

In the present invention, a pulley body is constituted by a pair of a fixed half pulley and a sliding half pulley, and a groove portion of the pulley body is formed on an opposing surface thereof.
A V-belt (8) is stretched between the pulley bodies. The V-belt (8) is a resin belt having a trapezoidal cross section with a short side on the inner peripheral side and a long side on the outer peripheral side.

  Grooves formed in tapered portions (42) and (62) of fixed half pulley (4) and sliding half pulley (6), and tapered portions (132) of output side sliding half pulley (13) and output side fixed half pulley (14) The V-belt (8) is stretched between the grooves formed in (142).

Next, the continuously variable automatic transmission operation will be described with reference to FIGS.
When the external load is not applied to the output shaft (10) or less than the predetermined load, the input pulley body is closest to the output pulley body as shown in FIG. Become. In order to achieve such a normal state, when the shape of the tapered portion or the like is the same on the input side and the output side, the spring constant of the first coil spring is larger than the spring constant of the second coil spring.

In a normal state, the input-side engagement pin (60) is at the left end position of the engagement slit (7a), and the output-side engagement pin (130) is at the left end of the engagement window (12a).
In this state, the effective diameter of the input-side pulley body is maximized by the tapered portion, and the effective diameter of the output-side pulley pair is minimized, resulting in a high-speed side shifting state.

  Here, the engagement window (12a) is an equilateral triangle or an isosceles triangle, and its apex is when the engagement pin (130) is at the left end. Then, two axially symmetric sides are formed toward the output-side sliding half pulley (13), and the bottom side is parallel to the half pulley (13).

  On the other hand, as shown in FIG. 2, when a load is applied to the output shaft (10), the frictional force between the V-belt (8) and the input pulley body increases, and the tension of the V-belt (8) increases. A force in the axial direction acts on the taper portions (42) and (62), and the sliding half pulley (6) slides gradually away from the fixed half pulley (4). At this time, it expands against the first coil spring.

On the other hand, although the V-belt (8) is slightly expanded and contracted by a resin or the like, the amount thereof is very small. Therefore, the output-side half pulley body has each half pulley (13) so that the effective diameter is increased in accordance with the entire length of the V-belt. (14) approaches, and at that time, the friction between the V-belt (8) and the output-side sliding half pulley (13) tends to slide in the direction in which the engagement pin (130) rotates.
This action is appropriately regulated by the engagement window (12a), and the engagement pin (130) slides along the side of the engagement window. As a result, when the interval between the output-side half pulleys is minimized, the sliding is stopped by moving to the other end of the sliding side of the engagement window (12a).

2A and 2B show the position of the engagement pin 130 in each rotational direction, and it can be seen that both slide in the rotational direction of the shaft.
With the above operation, as shown in FIG. 2A or FIG. 2B, the effective diameter of the input pulley body is small and the effective diameter of the output pulley body is large.

(Second embodiment)
The configuration of the first embodiment is a configuration in which an engagement window is provided on the output shaft side, but the present invention may be provided on the input shaft side. This embodiment has the configuration shown in FIGS.
Here, in addition to the configuration of the first embodiment, the output from the motor (1) is first-shifted by the gear unit (22) including the small gear (20) and the large gear (21), and then the large gear (21 ) To the input shaft (2).

  Parts having the same reference numerals are the same as those in the first embodiment, and in the second embodiment, the structures of the shifting cam (7 ') and the output side shifting cam (12') are different. The input side shifting cam (7 ') is provided with an engagement window (7b), and the output side shifting cam (12') is provided with an engagement slit (12b).

In the normal state, as shown in FIG. 4, the engagement pins (60) and (130) are at the left end of the engagement window (7b) and the engagement slit (12b).
The engagement window (7b) of the present embodiment is also an equilateral triangle or an isosceles triangle, and its apex is when the engagement pin (60) is at the left end. Then, two sides symmetrical in the axial direction are formed in the opposite direction to the fixed half pulley (4), and the bottom side is parallel to the half pulley (6).

  In this configuration, since a force opposite to the rotation acts on the sliding half pulley (6) due to the load applied to the output shaft, the sliding is performed in the opposite direction to the rotation direction. For example, the state of FIG. 5 shows a state in which a load is applied when the rotating shaft rotates clockwise as viewed from the right side of the figure.

The present invention realizes a continuously variable automatic transmission mechanism that automatically performs a stepless speed change operation according to the load on the output side, with the simple configuration shown in the first and second embodiments.
Such a continuously variable automatic transmission mechanism is suitable for a small output such as a model vehicle power instead of a large output power transmission. For example, a model motor uses a motor having an output of about 5 W to 100 W, particularly about 5 W to 60 W, and the present invention is a continuously variable automatic transmission mechanism particularly suitable for such a small output power source.

(Third embodiment)
FIG. 6 illustrates a configuration when mounted on a model vehicle.
As shown in the figure, the vehicle body (30) includes four tires (31), and the front wheels are rotatably supported by a driven shaft (32). As is well known, the direction of travel may be steered by swinging left and right.
And a rear wheel (31) is fixed to the both ends of the said output shaft (10), and is made to drive | work.

Although the embodiment of the present invention is as described above, the present invention is characterized in that either the input side or the output side half pulley is slidable only in the axial direction. Not only the combination of half pulleys, but both may be sliding half pulleys.
Also, the half pulleys are pressed toward each other by the elastic force. However, the coil springs are not limited to the arrangement method of the coil springs as in the above embodiment, and the coil springs are arranged between the half pulleys so as to approach them by the tensile force. You may make it act.

It is a perspective view which shows the normal state of the continuously variable automatic transmission mechanism concerning 1st Example of this invention. It is a perspective view which shows the load state of the continuously variable automatic transmission mechanism concerning 1st Example of this invention. It is a figure which shows the shape of the half pulley used in a present Example. It is a top view which shows the normal state of the continuously variable automatic transmission mechanism concerning 2nd Example of this invention. It is a top view which shows the load state of the continuously variable automatic transmission mechanism concerning 2nd Example of this invention. It is explanatory drawing explaining the structure of the self-propelled model vehicle concerning 3rd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Input shaft 3 Bearing bearing 4 Fixed half pulley 5 Fixed pin 6 Sliding half pulley 6a Face part 6b Bearing part 7 Shift cam 7a Engagement slit 10 Input shaft 11 Bearing bearing 12 Shift cam 12a Engagement window 13 Sliding half pulley 14 fixed half pulley 15 fixed pin 60 engaging pin 71 first coil spring 130 engaging pin

Claims (8)

A pulley body formed by using a region between opposing surfaces of a pair of opposed half pulleys supported on the same axis as a groove, one each of an input side pulley body on the input shaft and an output side pulley body on the output shaft A continuously variable automatic transmission mechanism that is arranged by stretching the belt around the input side pulley body and the output side pulley body,
The opposing surface of at least one half pulley in each pulley body is a tapered surface in which the distance from the opposing half pulley toward the center of each axis is narrowed,
An input side sliding restricting means for restricting at least one half pulley of the input side pulley body to slide within a predetermined range only in a direction parallel to the axial direction of the input shaft;
When at least one half pulley of the output side pulley body slides in the axial direction of the output shaft and the interval between the half pulleys becomes small, the half pulley can also rotate within a predetermined range in the rotation direction of the output shaft. Output side sliding restriction means for restricting in such a manner and each elastic means for generating a predetermined attractive force between each of the input-side and output-side half pulleys,
When the output shaft is lightly loaded, the input half pulley interval is small and the output half pulley interval is large. When the output shaft is heavy, the input half pulley interval is large and the output half pulley interval is small. A continuously variable automatic transmission mechanism characterized by performing a speed change action. The input side sliding regulating means is
An engagement member that is fitted on the input shaft and operates integrally with the half pulley is provided, and the engagement member is provided with either an engagement groove or an engagement slit parallel to the axial direction of the input shaft,
The continuously variable transmission mechanism according to claim 1, wherein the input shaft is configured by providing an engagement convex portion that engages with the engagement groove or the engagement slit. The output side sliding regulating means is
A configuration in which an engagement member that is externally fitted to the output shaft and operates integrally with the half pulley is provided, and the engagement member is provided with an engagement portion, while the output shaft is provided with an engagement convex portion that engages with the engagement portion. Because
The engaging portion has a substantially triangular shape, and when the output-side half pulley interval is maximized, the engaging convex portion is positioned at one vertex, and when the half-pulley interval changes to a small one, either 3. The continuously variable automatic transmission mechanism according to claim 1, wherein the engaging convex portion slides along the side and is formed so as to reach the other vertex of each side when the half pulley interval is minimized. A pulley body formed by using a region between opposing surfaces of a pair of opposed half pulleys supported on the same axis as a groove, one each of an input side pulley body on the input shaft and an output side pulley body on the output shaft A continuously variable automatic transmission mechanism that is arranged by stretching the belt around the input side pulley body and the output side pulley body,
The opposing surface of at least one half pulley in each pulley body is a tapered surface in which the distance from the opposing half pulley toward the center of each axis is narrowed,
When at least one half pulley of the input side pulley body slides in the axial direction of the input shaft and the interval between the half pulleys becomes large, the half pulley can be rotated within a predetermined range at the same time in the opposite direction of rotation of the output shaft. An input side sliding restricting means for restricting the output side and an output side slide for restricting at least one half pulley of the output side pulley body to slide within a predetermined range only in a direction parallel to the axial direction of the output shaft. Dynamic regulation means,
Each elastic means for generating a predetermined attractive force between each half pulley on the input side and the output side,
When the output shaft is lightly loaded, the input half pulley interval is small and the output half pulley interval is large. When the output shaft is heavy, the input half pulley interval is large and the output half pulley interval is small. A continuously variable automatic transmission mechanism characterized by performing a speed change action. The output side sliding regulating means is
An engagement member that is fitted on the output shaft and operates integrally with the half pulley is provided, and the engagement member is provided with either an engagement groove or an engagement slit parallel to the axial direction of the output shaft,
The continuously variable automatic transmission mechanism according to claim 4, wherein the output shaft is configured by providing an engagement convex portion that engages with the engagement groove or the engagement slit. The input side sliding regulating means is
A configuration in which an engagement member that is externally fitted to the input shaft and operates integrally with the half pulley is provided, and the engagement member is provided with an engagement portion, while the input shaft is provided with an engagement convex portion that engages with the engagement portion. Because
The engaging portion has a substantially triangular shape, and when the half pulley interval on the input side is minimized, the engaging convex portion is positioned at one apex, and when the half pulley interval changes greatly, either The continuously variable automatic transmission mechanism according to claim 3 or 4, wherein the engaging convex portion slides along the side and is formed so as to reach the other vertex of each side when the half pulley interval is maximized. It is a model vehicle that can run on its own power means,
Power means for generating rotational power;
An input shaft coupled to the power means;
An output shaft that pivotally supports at least one of the one or more wheels;
A continuously variable automatic transmission mechanism that shifts between the input shaft and the output shaft;
The continuously variable automatic transmission mechanism is
A pulley body formed by using a region between opposing surfaces of a pair of opposed half pulleys supported on the same axis as a groove, one each of an input side pulley body on the input shaft and an output side pulley body on the output shaft A continuously variable automatic transmission mechanism that is arranged by stretching the belt around the input side pulley body and the output side pulley body,
The opposing surface of at least one half pulley in each pulley body is a tapered surface in which the distance from the opposing half pulley toward the center of each axis is narrowed,
An input side sliding restricting means for restricting at least one half pulley of the input side pulley body to slide within a predetermined range only in a direction parallel to the axial direction of the input shaft;
When at least one half pulley of the output side pulley body slides in the axial direction of the output shaft and the interval between the half pulleys becomes small, the half pulley can also rotate within a predetermined range in the rotation direction of the output shaft. Output side sliding restriction means for restricting in such a manner and each elastic means for generating a predetermined attractive force between each of the input-side and output-side half pulleys,
When the output shaft is lightly loaded, the input half pulley interval is small and the output half pulley interval is large. When the output shaft is heavy, the input half pulley interval is large and the output half pulley interval is small. A self-propelled model vehicle characterized by a shifting action. It is a model vehicle that can run on its own power means,
Power means for generating rotational power;
An input shaft coupled to the power means;
An output shaft that pivotally supports at least one of the one or more wheels;
A continuously variable automatic transmission mechanism that shifts between the input shaft and the output shaft;
The continuously variable automatic transmission mechanism is
A pulley body formed by using a region between opposing surfaces of a pair of opposed half pulleys supported on the same axis as a groove, one each of an input side pulley body on the input shaft and an output side pulley body on the output shaft A continuously variable automatic transmission mechanism that is arranged by stretching the belt around the input side pulley body and the output side pulley body,
The opposing surface of at least one half pulley in each pulley body is a tapered surface in which the distance from the opposing half pulley toward the center of each axis is narrowed,
When at least one half pulley of the input side pulley body slides in the axial direction of the input shaft and the interval between the half pulleys becomes large, the half pulley can be rotated within a predetermined range at the same time in the opposite direction of rotation of the output shaft. An input side sliding restricting means for restricting the output side and an output side slide for restricting at least one half pulley of the output side pulley body to slide within a predetermined range only in a direction parallel to the axial direction of the output shaft. Dynamic regulation means,
Each elastic means for generating a predetermined attractive force between each half pulley on the input side and the output side,
When the output shaft is lightly loaded, the input half pulley interval is small and the output half pulley interval is large. When the output shaft is heavy, the input half pulley interval is large and the output half pulley interval is small. A self-propelled model vehicle characterized by a shifting action.

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