WO2011007460A1

WO2011007460A1 - Radio control car

Info

Publication number: WO2011007460A1
Application number: PCT/JP2009/064233
Authority: WO
Inventors: 信昭荻原
Original assignee: 株式会社シー・シー・ピー
Priority date: 2009-07-14
Filing date: 2009-08-12
Publication date: 2011-01-20
Also published as: JP2011019594A

Abstract

Provided is a radio control car equipped with a chassis to which a plurality of types of body can be attached without forcing a user to destroy the design of a car or to accept increase in cost. A radio control car is characterized by comprising a front axle to which front wheels are coupled, a rear axle to which rear wheels are coupled, a chassis which supports the front axle and rear axle and to which a body is attached, and a means for adjusting the dimension of wheelbase. The radio control car also comprises a drive motor for driving the front wheel, a steering mechanism for steering the front wheel, and a steering motor for driving the steering mechanism, and is characterized in that the drive motor, the steering mechanism and the steering motor are arranged at positions of the chassis closer to the front wheel than the rear wheel.

Description

Radio control car

The present invention relates to a radio-controlled vehicle, and more particularly, to a radio-controlled vehicle including a chassis whose wheelbase can be adjusted.

Unlike conventional vehicles, the drive system of conventional radio-controlled vehicles (hereinafter referred to as radio controlled vehicles) is 2WD (two-wheel drive) of RR (rear engine (motor) / rear drive method) and 4WD (four-wheel drive) of midship type. Driving) (see Patent Document 1) is the mainstream. In these types, a power source such as a motor is arranged on the rear side of the body, that is, on the rear wheel side. In this case, since the servo motor for steering the front wheels is arranged in the vicinity of the front wheels, the drive motor for traveling is arranged on the rear wheel side and the steering motor for steering is distributed on the front wheel side. Become.

Furthermore, there are two types of radio-controlled car bodies: the actual car body scaled down and placed on the chassis, and the body modeled with a fictitious appearance placed on the chassis.

In the body scaled down from the former actual vehicle, the wheelbase that is the distance between the front wheel axle and the rear wheel axle is determined for each vehicle, and it was necessary to develop the body according to the wheelbase. Therefore, since the wheelbase of each car is different, even if a new chassis for a radio controlled vehicle is developed corresponding to a certain body, the body of another car with a different wheelbase must be placed in the chassis. I couldn't. Therefore, when using various radio controlled vehicles, users of radio controlled vehicles should prepare a chassis for each body with a different wheel base, or make sure that different bodies with different wheel bases fit a common chassis. It is necessary to use a modified body.

JP 2007-29139 A

However, in order to prepare multiple types of chassis, an increase in cost is inevitable, and there is a concern that the atmosphere of the actual vehicle will be lost when the body design is changed.

The present invention has been made in view of the above points, and provides a radio-controlled vehicle equipped with a chassis that can be equipped with a plurality of types of bodies without impairing the atmosphere of the actual vehicle or forcing the user to increase costs. The purpose is to do.

In order to solve the above problems, a radio control vehicle according to the present invention supports a front wheel shaft to which a front wheel is connected, a rear wheel shaft to which a rear wheel is connected, the front wheel shaft and the rear wheel shaft, and a body is mounted. It is characterized by comprising a chassis and adjusting means for adjusting the dimensions of the wheel base.

The radio control vehicle of the present invention further includes a drive motor for driving the front wheels, a steering mechanism for steering the front wheels, and a steering motor for driving the steering mechanism, the drive The motor, the steering mechanism, and the steering motor are arranged at a position closer to the front wheel than the rear wheel of the chassis.

In the radio control vehicle according to the present invention, the chassis includes a front chassis on which the front wheel shaft is supported and a rear chassis on which the rear wheel is supported, and the adjusting means is provided on the rear chassis. It is characterized by.

The radio control vehicle according to the present invention is characterized in that the adjusting means is a plurality of grooves provided in the chassis for supporting the rear wheel shaft.

The radio control automobile of the present invention is characterized in that the rear chassis is formed of a hollow member.

The radio control vehicle of the present invention is characterized in that a shaft support portion that supports the rear wheel shaft is formed of a flexible member and is provided in the rear chassis.

The radio-controlled vehicle of the present invention is characterized in that the two rear wheels mounted on the rear wheel shaft can rotate independently of each other with respect to the rear wheel shaft.

The radio control automobile of the present invention is characterized in that the drive motor and the steering motor are arranged in parallel in the width direction of the chassis, with rotation axes parallel to each other.

In the radio control vehicle according to the present invention, the chassis includes a front chassis on which the front wheel shaft is supported and a rear chassis on which the rear wheel is supported, and the adjusting means includes the front chassis and the rear chassis. It is a spacer interposed therebetween.

According to the present invention, it is possible to realize a radio-controlled vehicle in which various bodies having different wheel bases can be mounted on a common chassis without impairing the atmosphere of the actual vehicle by providing the chassis with adjustment means that can change the wheel base. Furthermore, since it is not necessary to prepare a chassis for each body having a different wheelbase, it is possible to suppress an increase in the cost of a radio-controlled vehicle.

It is a perspective view which shows the external appearance of the radio controlled vehicle and transmitter which concern on embodiment of this invention. FIG. 2 is a perspective view of the chassis with a body removed from the radio controlled vehicle shown in FIG. 1, with the chassis cover expanded and the left front wheel removed. FIG. 3 is a partial perspective view showing a drive system of the front chassis shown in FIG. 2, in which a left coupling member and a knuckle are developed. (A) is a perspective view of a correction | amendment rod, (b) is a perspective view which shows the positional relationship of a correction | amendment rod, a tie rod, and a torsion coil spring. It is a perspective view of the back surface of a chassis, Comprising: The battery cover is expand | deployed. FIG. 3 is a perspective view of the rear chassis shown in FIG. 2 as viewed from above. FIG. 3 is a perspective view of the rear chassis shown in FIG. 2 as viewed from below, with the right rear wheel removed.

Hereinafter, a radio control vehicle 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing external appearances of a radio controlled vehicle 1 and a transmitter 3 according to an embodiment of the present invention, and FIG. 2 is a perspective view of a chassis with a body removed from the radio controlled vehicle shown in FIG. The chassis cover is expanded and the left front wheel is removed. FIG. 3 is a partial perspective view showing a drive system of the front chassis shown in FIG. 2, in which a left coupling member and a knuckle are developed. FIG. 4A is a perspective view of the correction rod 61, FIG. 4B is a perspective view showing the positional relationship among the correction rod 61, the tie rod 55, and the torsion coil spring 64, and FIG. FIG. 3 is a perspective view of the back surface of the battery, in which a battery cover is developed. 6 is a perspective view of the rear chassis 7b shown in FIG. 2 as viewed from above, and FIG. 7 is a perspective view of the rear chassis shown in FIG. It has been removed.

As shown in FIG. 1, the radio controlled vehicle 1 includes a body 5 and a chassis 7 (see FIG. 2, etc.) with a bumper 6 for absorbing the impact of a collision attached to the tip. When the user operates a stick-like operation unit (steering stick 3a, speed stick 3b) of the transmitter 3, a control signal is wirelessly transmitted from the transmitter 3. The control signal is received by a receiver 13 (see FIG. 2 and the like) built in the radio controlled vehicle 1, the drive motor 23 and the steering motor 27 are operated, and the radio controlled vehicle 1 travels as intended by the operator. . Note that the transmitter 3 can be a conventional two-way forward / backward and left / right steering system.

The configuration of the chassis 7 of the radio controlled vehicle 1 will be described with reference to FIG. The chassis 7 includes a front chassis 7a and a rear chassis 7b connected to the front chassis 7a. A front wheel 9 (wheel 9a and tire 9b), a front wheel shaft 35, a steering mechanism 11, a receiver 13, a battery 15 (see FIG. 5), and the like are disposed in the front chassis 7a. A rear wheel 17 (wheel 17a and tire 17b), a rear wheel shaft 19 and the like are disposed on the rear chassis 7b.

The configuration of the front chassis 7a will be described in detail. The front chassis 7 is mainly provided with a drive motor 23 for driving the front wheels 9, a steering motor 27 for driving the steering mechanism 11, and a front region 8a to which the chassis cover 14 is screwed, and a receiver. 13 and the battery 15 are disposed and have a central region 8b adjacent to the rear chassis 7b. The chassis cover 14 includes a columnar body support 89, and the body support 89 is provided with a hole 89a through which a snap pin 90 (see FIG. 1) for fastening the body 5 is passed.

As shown in FIG. 3, the rotational axes of the

rotational shafts

23a and 27a of the drive motor 23 and the steering motor 27 are parallel to the longitudinal direction of the chassis 7, and both

rotational shafts

23 and 27a protrude in the same direction.

Motors

23 and 27 are juxtaposed in the width direction of the chassis 7. By arranging the

motors

23 and 27 in this way, the electrical wiring to the

motors

23 and 27 can be simplified. Further, since both

motors

23 and 27 are juxtaposed in the width direction of the chassis 7, the left and right weight balance in the chassis 7 is close to each other, and the straight traveling performance of the radio controlled vehicle 1 can be improved.

A drive motor pinion gear 28 is attached to the rotary shaft 23a of the drive motor 23. The drive motor pinion gear 28 is mounted on a drive intermediate gear shaft 29 that extends substantially perpendicularly to the rotation shaft 23a of the drive motor 23 (short direction of the chassis 7) and is rotatably supported by the front chassis 7a. The drive intermediate gear 31 is meshed with the crown gear 31a. Further, on the side of the crown gear 31a facing the direction in which the gear portion protrudes, a pinion gear 31b that is coaxially integrated with the crown gear 31a and that constitutes the drive intermediate gear 31 is mounted on the drive intermediate gear shaft 29. Yes. The pinion gear 31 b meshes with a spur gear fixed to the front wheel shaft 35, that is, a drive gear 37.

As shown in FIG. 3, hexagonal drive joints 41 are attached to both ends of the front wheel shaft 35. The hexagonal drive joint 41 is formed by engraving six grooves at equiangular intervals on the outer peripheral surface of a substantially ellipsoidal member. Further, the hexagonal drive joint 41 is inserted into the receiving hole 42b provided with a protrusion that engages with the groove, and is attached to the coupling member 42. Therefore, the coupling member 42 has the wheel shaft 42 a, and when the hexagonal drive joint 41 is inserted into the accommodation hole 42 b of the coupling member 42, the rotational force of the hexagonal drive joint 41 is transmitted to the coupling member 42. Is done.

By using the hexagonal drive joint 41, the contact area with the coupling member 42 can be made relatively large, the load accompanying the transmission of the rotational force can be dispersed, and the transmission efficiency can be increased. As a result, durability can be improved as compared with a joint structure in which power is transmitted by a shaft and a cup that are conventionally used on the premise of two-point contact. Accordingly, in order to improve transmission efficiency and durability, the number of grooves of the drive joint to be inscribed is not limited to six, and three (triangle), eight (eight corners), and the like can be appropriately selected.

When the coupling member 42 is fixed to the knuckle 44 having the knuckle arm 44 a, the wheel shaft 42 a protrudes from the knuckle 44. The wheel 9a on which the tire 9b of the front wheel 9 is mounted is fixed to the protruding wheel shaft 42a. The knuckle 44 is provided with a king pin 48 extending in a direction perpendicular to the front wheel shaft 35. In this way, the positional relationship in which the longitudinal axis of the king pin 48 passes through the center of the hexagonal drive shaft 41 can simplify the mechanism for transmitting the rotational force of the front wheel shaft 35 to the front wheel 9, and the rotation Power transmission loss can be suppressed.

The upper and lower portions of the king pin 48 are supported by the through hole 14a of the chassis cover 14 and the through hole 8 of the front chassis 7a, respectively, so that the knuckle 44 can change its direction with respect to the rear wheel shaft 35 with the king pin 48 as a rotation axis. It is. The knuckle arm 44a is substantially L-shaped, extends from the vicinity of the upper portion of the kingpin 48 toward the rear of the chassis 7, and is bent upward in the vertical direction. Therefore, by swinging the knuckle arm 44a around the king pin 48, the angle of the rear wheel 9 with respect to the rear wheel shaft 35 can be changed.

Thus, the rotational force from the rotating shaft 23a of the drive motor 23 is as follows: drive motor pinion gear 28, drive intermediate gear 31 (crown gear 31a, pinion gear 31b), drive gear 37, front wheel shaft 35, coupling member 42 ( It is transmitted to the wheel (9a) of the front wheel 9 via the wheel shaft 42a), and the front wheel 9 (tire 9b) rotates.

As shown in FIG. 3, the rotating shaft 27a of the steering motor 27 is connected to a clutch case gear 39 in which a centrifugal clutch 39a (the interior of the clutch is not shown) and a pinion gear 39b are coaxially integrated. Further, as shown in FIG. 2, the pinion gear 39b constituting the clutch case gear 43 is rotatably fixed to a steering intermediate gear shaft 46 extending substantially perpendicular to the rotation shaft 27a. Mesh with the crown gear 45a. Here, the steering intermediate gear 45 includes a crown gear 45a and a pinion gear 45b that are integrally formed coaxially, and the pinion gear 45b is attached to the steering intermediate shaft 46 on the side facing the direction in which the gear portion of the crown gear 45a protrudes. It is installed.

Further, the pinion gear 45b of the steering intermediate gear 45 is configured to mesh with a spur gear 51a of the steering gear 51 mounted on the steering gear shaft 50 extending in parallel with the steering intermediate shaft 46. Here, the steering gear 51 includes a spur gear 51 a and a pinion gear 51 b that are integrally formed coaxially, and the pinion gear 51 b is configured to mesh with a rack gear 57 that constitutes the steering mechanism 11.

Here, the steering mechanism 11 includes a rack gear 57, a tie rod 55 integrally formed with the rack gear 57 shown in FIGS. 3 and 4 described above, a king pin 48, and a knuckle 44 having a knuckle arm 44a. The above-described knuckle arm 44a of FIG. 3 is engaged with the ring portions 55a provided at both ends of the tie rod 55. When the tie rod 55 moves in the short (width) direction of the chassis 7, the front wheel 9 is tilted so that the radio-controlled vehicle 1 moves left and right.

Thus, by arranging the relatively

heavy motors

23, 27, etc. in the front chassis 7a, the weight distribution on the front wheel 9 side of the chassis 7 can be increased, and the rotation of the front wheels 9 as drive wheels can be effectively performed. It can be transmitted to the ground, and the advanceability of the radio controlled vehicle 1 can be improved. Furthermore, a power transmission mechanism such as a gear for transmitting the steering rotational force can be reduced in size.

As in the present embodiment, by arranging the center of gravity of the radio controlled vehicle 1 closer to the front wheel 9 than the rear wheel 17, the radius of the turn can be reduced by sliding the rear wheel 17 when the radio controlled vehicle 1 is turned. Accordingly, it is possible to realize the radio controlled vehicle 1 that can easily perform a special traveling mode such as drift and spin in addition to the normal grip traveling utilizing the gripping force of the

tires

9b and 17b. In particular, since the driving wheel is the front wheel 9 and the rear wheel 17 slides sideways, it is possible to prevent the vehicle from becoming inoperable even during drift or spinning. Therefore, even if there is an obstacle or the like in a place where the radio controlled vehicle 1 is traveling, or in a narrow space such as a room, the user can sufficiently enjoy traveling because the radius of the radio controlled vehicle 1 is small. .

In the above configuration, when the number of rotations of the rotating shaft 27a of the steering motor 27 exceeds a predetermined value, the centrifugal clutch 39a constituting the clutch case gear 39 is connected, and the rotational force is transmitted to the integral pinion gear 39b, whereby the steering intermediate gear 45 Are transmitted to the crown gear 45a, the integral pinion gear 45b, the spar gear 51a, the integral pinion gear 51b, and the rack gear 57 that constitute the steering gear 51. Facing left and right. As described above, the tie rod 55 is always adjusted by the both

end portions

64a and 64b of the torsion coil spring 64 wound around the spring receiving cap 63 that is rotatably disposed at the upper end portion of the steering gear shaft 50. Since it is biased to the neutral position adjusted by 61d (see y in FIG. 4B), when the operator releases the steering stick 3a of the transmitter 3, the front wheel 9 returns to the neutral position. Show propensity.

Next, the correction mechanism 59 will be described. The correction mechanism 59 corrects the position of the tie rod 55 in order to straighten the front wheel 9 so that the radio controlled vehicle 1 moves straight without being biased left and right when the hand is released from the steering operation unit 3b of the transmitter 3. It is a mechanism to do.

As shown in FIG. 4, the correction mechanism 59 includes a tie rod 55, a correction rod 61, and a torsion coil spring 64. A protruding portion 55 b that protrudes upward in the vertical direction is provided at a substantially central position in the longitudinal direction of the tie rod 55. The correction rod 61 extends downward in the vertical direction from a disc-shaped first connecting member 61a and a position on the back surface of the first connecting member 61a and shifted from the center of the first connecting member 61a to the outer peripheral side. The rod main body 61b, a columnar adjustment knob 61d (see FIG. 5) that is connected to the lower end portion of the rod main body 61b via the second connecting member 61c and is exposed on the back surface of the front chassis 7a, and the first connection. A columnar spring engaging portion 61e extending upward in the vertical direction from a position on the surface of the member 61c that is diametrically opposed from a position where the rod body 61a is coupled, and substantially parallel to the first coupling member 61a. And a columnar support portion 61g connected to the spring engaging portion 61e via the extending disc-like third connecting member 61f.

In a state where the adjustment knob 61d is supported by the through hole 62 of the front chassis 7a and the support portion 61g is supported by the front chassis cover 8, the rotation axis x passing through the central axes of the adjustment knob 61d and the support portion 61g that are concentric with each other. The correction rod 61 can be rotated around. When the adjustment rod 61 is rotated, the spring engaging portion 61e rotates so as to draw a predetermined deformation arc from the rotation axis x.

Further, as described above, the torsion coil spring 64 is attached to the steering gear shaft 50 of the steering gear 51 via the spring receiving cap 63, and both

end portions

64a and 64b extend so as to sandwich the protruding portion 55b of the tie rod 55. And reaches the spring engaging portion 61e of the correction rod 61. The torsion coil spring 63 is mounted in such a state that both

end portions

64a and 64b are urged toward each other (see y in FIG. 4B). Accordingly, when the recess 61h of the adjustment knob 61d (see FIG. 4) is rotated by a predetermined amount by a minus driver or the like to swing the spring engaging portion 61a, the tightening force by the torsion coil spring 64 acts on the protruding portion 55b of the tie rod 55. Therefore, the spring engaging portion 61e swings according to the rotation amount of the adjustment knob 61b, and the tie rod 55 moves to the left or right. In this way, the straightness of the radio controlled vehicle 1 can be corrected by the correction mechanism 59. Further, the tip of the disk-shaped first connecting member 61a constituting the correction rod 61 on the spring engaging portion 61e side has a tip formed in a triangle via a through-hole portion 61a2, as shown in FIG. The protrusion 61a1 is formed, and the tip protrusion 61a1 meshes with any one of the receiving grooves 66 (shown only in FIG. 4B) fixed to the front region 8a of the chassis 7, whereby the adjustment knob 61b. It is possible to give the user a click feeling according to the rotation of the tie rod 55 and to keep the correction rod 61 including the adjustment knob 61b and the tie rod 55 linked via the torsion coil spring 64 in the adjustment position. Further, due to the flexibility generated by the presence of the through-hole portion 61a2 of the disk-shaped first connecting member 61a, the tip protrusion 61a1 can easily move between the grooves of the receiving groove portion 66.

As shown in FIG. 5, a battery holder 65 for holding the battery 15 is disposed on the rear surface of the rear chassis 7b. The radio controlled vehicle 1 of this embodiment operates the receiver 13, the drive motor 23, and the steering motor 27 with the electric power from the battery 15 (four AA batteries). The battery holder 65 is disposed in the central region 8b of the front chassis 7a (that is, approximately the center of the chassis 7), and four batteries 15 are juxtaposed in the width direction.

In order to reduce the size of the front chassis 7a, the battery holder 65 is provided with a step. That is, the bottom surface of the battery holder 65 has two batteries arranged in the middle of the remaining two with respect to the area where the two batteries 15 arranged so as to sandwich the receiver 13 in the width direction of the chassis 7 are placed. The area in which 15 is placed is positioned below the receiver 13 (upper in FIG. 5). After the battery 15 is loaded in the battery holder 65, the battery cover 16 is screwed to the back surface of the front chassis 7a to prevent the battery 15 from falling. Due to the step of the battery holder 65, the mounting area of the battery 15 can be reduced, and the receiver 13 can be disposed between the batteries 15 so that the vehicle body can be downsized.

6 and 7, the rear chassis 7b has a plate-like member 71 that extends in the width direction and is engaged with the two hook members 72 of the front chassis 7a. Further, a positioning projection 70 is provided at substantially the center of the plate-like member 71. The protrusion 70 fits between the two hook members 72 described above, so that when the front chassis 7a and the rear chassis 7b are connected, positioning in the width direction thereof is performed. In order to connect the rear chassis 7b to the front chassis 7a, after the plate-like member 71 is accommodated in the hook 72, the through-holes of the screwing portions 21 provided at both ends of the plate-like member 71 of the rear chassis 7b are inserted. The screw is passed through and screwed into a screw hole (not shown) provided in the front chassis 17a.

Further, the plate-like member 71 extends on substantially the same plane and is connected with an outer frame 73 in a substantially U-shape. The outer frame 73 includes a pair of outer front frames 73a extending substantially in parallel, a pair of outer rear frames 73b bent so as to protrude outward in the width direction of the chassis 7 at an intermediate position in the length direction, and a rear end The frames 73c are connected to each other through a cylindrical joint 75 that opens in the vertical direction. The outer frame 73 is a hollow member having a C-shaped cross section, and is a member that opens upward in the vertical direction.

An inner frame 77 that connects between the cylindrical joints 75 to which both ends of the outer rear frame 73b are connected extends inward in the width direction of the chassis 7 of the outer rear frame 73b.

Further, a shaft support portion 83 extending in the longitudinal direction of the chassis 7 is provided at an equal distance from the two inner frames 77 facing each other in the width direction of the chassis 7. The shaft support portion 83 is a semi-cylindrical member that protrudes downward, and regulates the upward movement of the shaft rear wheel shaft 19 in the vertical direction.

Further, the shaft support portion 83 is connected by a flexible L-shaped beam 79. The L-shaped beam 79 extends from the inner frame 77 in the width direction of the chassis 7, is bent downward in the vertical direction of the chassis 7, and is connected to the shaft support portion 83. Here, since the L-shaped beam 79 has flexibility, it functions as a suspension that absorbs an impact transmitted to the rear wheel shaft 19.

Furthermore, a plate-like first skirt portion 81 extending downward in the vertical direction is connected to the lower surface of the inner frame 77. A part of the second skirt portion 87 is in contact with the lower edge portion of the first skirt portion 81. The upper edge portion of the second skirt portion 87 is provided with a U-shaped groove 87a defined by two parallel long side portions and an arc portion connecting one end portions of the two long side portions. It has been. The downward movement of the rear wheel shaft 19 in the vertical direction is restricted by the arc portion that forms the groove 87a.

The front edge of the second skirt portion 87 is fixed by a side frame 92 that is the same hollow member as the outer frame 73 and the inner frame 77. One end of the side frame 92 is connected to the outer front frame 73 a and the other end is connected to the inner frame 77. The rear edge of the second skirt portion 87 is connected to a rear frame 94 that is a hollow member similar to the side frame 92. Both ends of the rear frame 94 are connected to two cylindrical joints 75 to which the body support 89 is attached, respectively.

In addition, a rib 85 extending perpendicularly to the inner surface of the second skirt portion 87 and extending inward in the width direction of the chassis 7 is formed between the two

adjacent grooves

87a and 87a of the second skirt portion 87. Provided. The rib 85 secures the rigidity of the second skirt portion 87 and functions as a fixing portion for fixing the second skirt portion 87 to the first skirt portion 81. The shaft support portion 83 described above has a length in the longitudinal direction that can support the rear wheel shaft 19 even when the rear wheel shaft 19 is inserted into any groove 87a. Therefore, the shaft support portion 83 performs a suspension function regardless of the position of the groove 87a into which the rear wheel shaft 19 is inserted. The number of grooves 87a and the interval between adjacent grooves 87a can be changed as appropriate.

Thus, by providing a plurality of grooves 87 a in the second skirt portion 87, various bodies with different wheel bases can be mounted on the chassis 7. Therefore, in order to obtain a radio controlled vehicle having a body with a different wheel base, it is possible to realize a highly versatile chassis that does not require a separate chassis suitable for the body.

Note that the movement of the rear wheel shaft 19 in the longitudinal (front-rear) direction of the chassis 7 is restricted by the long side portion constituting the groove 87a. In the present embodiment, the distance between the two long side portions, that is, the width of the groove 87a is dimensioned so that the rear wheel shaft 19 can penetrate. Accordingly, the rear wheel shaft 19 is supported by the shaft support portion 83, the arc portion of the groove 87a, and the linear portion of the groove 87a.

The cylindrical joint 75 to which both end portions of the rear end frame 73c are connected extends in the vertical direction. The cylindrical joint 75 is fitted with a body support 89 provided with a hole 89a through which a snap pin 90 (see FIG. 1) for fastening the body 5 to the tip is passed. Further, a lower portion of the body support 89 located on the right side in FIG. 6 is provided with a connecting portion 99a that supports a cylindrical antenna fixing portion 99, and the antenna 97 (see FIG. 1) can be fixed. ing. Accordingly, by rotating the body support 89 (see z in FIG. 6), the antenna fixing unit 99 is also rotated, and the position of the antenna 97 can be adjusted.

Further, the hub 91a of the wheel 91 to which the rear wheel 17 is attached is fixed to a rotor 19a that is rotatably fitted to both ends of the cylindrical rear wheel shaft 19. Accordingly, since the two rear wheels 17 mounted on the rotor 19a of the rear wheel shaft 19 via the wheel 18 can be independently rotated, the minimum turning radius of the radio controlled vehicle 1 can be reduced.

Furthermore, as in this embodiment, by forming the outer frame 73 and the inner frame 77 from members having a C-shaped cross section, flexibility can be imparted to the structure of the entire rear chassis 7b. As a result, the rear chassis 7b can absorb the impact received while the radio controlled vehicle 1 is traveling. Therefore, the impact can be absorbed by the above-described bending of the shaft support portion 83 itself, the bending of the rib 79 itself, and the bending of the outer frame 73 and the inner frame 77.

Further, by reducing the weight of the rear chassis 7b as in the present embodiment, it is possible to easily slide the rear chassis 7b to the side opposite to the steering direction during steering, and the side slip causes the steering. It is possible to easily point the vehicle body in the direction. Accordingly, a small turning radius is achieved as compared with turning by normal grip traveling, and indoor traveling and traveling under conditions with many obstacles are facilitated.

In this embodiment, the outer frame 73 and the inner frame 77 have a C-shaped cross section, but the present invention is not limited to this shape, and tubular members having various cross-sectional shapes can be selected as long as they are hollow. By adopting the hollow member, it is possible to reduce the weight while ensuring the rigidity of the rear chassis 7b.

Furthermore, although the adjusting means for adjusting the dimensions of the wheel base of the present embodiment is the groove 87a provided in the rear chassis 7b, the present invention is not limited to this configuration. For example, a spacer made of a plate-shaped member having a predetermined thickness, an additional member having an appropriately shaped shape, or a combination thereof interposed between the front chassis 7a and the rear chassis 7b can be used as the adjusting means. The adjusting means may be configured to use the groove 87a and the spacer, or may be configured to be either one.

In addition, although the tire 9b of the front wheel 9 and the tire 17b of the rear wheel 17 in this embodiment are configured to secure grip force using a slick tire having a low hardness, the hardness according to the state of the road surface used by the radio controlled vehicle 1 It goes without saying that tires with a high grip strength can be used. For example, when the radio controlled vehicle 1 is used in a narrow place, a hard tire is used as the tire 17b of the rear wheel 17, so that when the radio controlled vehicle 1 is turned, the rear wheel 17 is further slid to the side opposite to the steering direction. By making it easier, the turning radius can be further reduced as compared with turning by normal gripping.

Further, since the rear chassis 7b is only provided with a mechanism for supporting the rear wheel 17, an additional motor for driving four wheels is arranged on the rear chassis 7b, or a ladder for a ladder car is operated. Mechanisms can be arranged and additional functions can be easily added.

In the present embodiment, the cylindrical joint 75 to which the body support 89 is attached and the cylindrical antenna fixing portion 99 for fixing the antenna 97 are separated from each other. However, the cylindrical joint 75 itself is the antenna fixing portion 99. May be used as In addition, since the plurality of cylindrical joints 75 are provided, the antenna fixing position suitable for the body can be selected even when the body is changed. Further, by replacing the front wheel shaft 35 and the rear wheel shaft 19 and extending the lengths of the front wheel shaft 35 and the rear wheel shaft 19, even when the body is changed, not only the wheel base but also a body with a different vehicle width can be used. It is also possible to adopt.

This invention can be embodied in many forms without departing from its essential characteristics. Therefore, it is needless to say that the above-described embodiments and examples are merely illustrative and do not limit the present invention.

DESCRIPTION OF SYMBOLS 1 Radio control vehicle 3 Transmitter 5 Body 6 Bumper 7 Chassis

7a Front chassis

7b Rear chassis 8a Front area 8b Center area 9 Front wheel 9a Wheel 9b Tire 11 Steering mechanism 13 Receiver 14 Chassis cover 15 Battery 17 Rear wheel 17a Wheel 17b Tire 19 Rear wheel shaft 23 Drive motor 23a (drive motor) rotary shaft 27 Steering motor 27a (steering motor) rotary shaft 28 Drive motor pinion gear 29 Drive intermediate gear shaft 31 Drive intermediate gear 31a Crown gear 31b Pinion gear 35 Front wheel shaft 37 Drive gear 39 Clutch case gear 39a Centrifugal clutch 39b Pinion gear 41 Hexagon drive joint 42 Coupling member 43 Clutch case gear 4 Knuckle 44a Knuckle arm 45 Steering intermediate gear

45a Crown gear

45b Pinion gear 46 Steering intermediate gear shaft 48 King pin 50 Steering gear shaft 51 Steering gear

51a Spur gear

51b Pinion gear 55 Tie rod

55a Ring portion

55b Protruding portion 57 Rack gear 59 Correction mechanism 61 Correction rod 61d Adjustment knob 61e Spring engaging portion 63 Spring receiving cap 64 Torsion coil spring 64a, b Both ends 65 Battery holder 71 Plate member 73 Outer frame 75 Cylindrical joint 81 First skirt portion 83 Shaft support portion 85 Rib 87 Second Skirt portion 87a Groove 89 Body support 90 Snap pin 97 Antenna 99 Antenna fixing portion

Claims

A front wheel shaft to which the front wheels are connected;
A rear wheel shaft to which the rear wheel is connected;
A chassis that supports the front wheel axle and the rear wheel axle and is fitted with a body;
A radio control vehicle comprising: adjusting means for adjusting a dimension of the wheel base.
And a drive motor for driving the front wheel, a steering mechanism for steering the front wheel, and a steering motor for driving the steering mechanism. The drive motor, the steering mechanism, and the steering The radio control vehicle according to claim 1, wherein the motor is disposed at a position closer to the front wheel than the rear wheel of the chassis.
The said chassis is comprised from the front chassis in which the said front-wheel axis | shaft is supported, and the rear chassis in which the said rear wheel is supported, The said adjustment means is provided in the said rear chassis. The radio control vehicle according to claim 2.
The radio control vehicle according to claim 1 or 2, wherein the adjusting means is a plurality of grooves provided in the chassis for supporting the rear wheel shaft.
The radio control vehicle according to any one of claims 2 to 4, wherein the rear chassis is formed of a hollow member.
The shaft support portion that supports the rear wheel shaft is configured by a member having flexibility, and is provided in the rear chassis. Radio control car.
The radio control according to any one of claims 1 to 6, wherein the two rear wheels mounted on the rear wheel shaft are rotatable independently of each other with respect to the rear wheel shaft. Car.
The radio control vehicle according to claim 6 or 7, wherein the drive motor and the steering motor have rotational axes parallel to each other and juxtaposed in the width direction of the chassis.
The chassis includes a front chassis on which the front wheel shaft is supported and a rear chassis on which the rear wheel is supported, and the adjusting means is a spacer interposed between the front chassis and the rear chassis. The radio control vehicle according to claim 1, wherein the radio control vehicle is a vehicle.