JP2000334178A - Steering device model car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steering device for a model car, such as a model four- wheel drive car or model front drive car, which does not make direction changing, meandering, and the like, by itself even if there is ruggedness on a road surface. SOLUTION: This device has a turning rod 63 for steering, a steering angle transmission rod 72 and right and left transmission rods 73 and 74. The steering angle transmission rod 72 turns according to the turning of the turning rod 63 for steering. Respective active sides 90 and 95 of the right and left transmission rods 73 and 74 are connected to positions parted apart a required distance from the center of turning of the steering angle transmission rod 72. Respective passive sides 98 and 99 of the respective transmission rods 73 and 74 are respectively connected to steering anus 76 of respective front wheels 38 and 39. The right and left transmission rods 73 and 74 are relatively moved by turning of the turning rod 63 for steering, by which the steering angles are transmitted to the respective front wheels 38 and 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering system for a model vehicle, and more particularly to a steering system for a model vehicle suitable for use in a four-wheel drive or front wheel drive model vehicle. (Hereafter, "4
"Wheel drive" is called "4WD", "front wheel drive" is called "precursor", "4 wheel drive model car" is called "model 4WD", and "front wheel drive model car" is called "model precursor". )

[0002]

2. Description of the Related Art A model car uses a steering mechanism 24 as shown in FIG. This steering mechanism 2
Reference numeral 4 denotes a small steering motor 1 arranged on the upper surface of a chassis, which is described in Japanese Utility Model Laid-Open No. 5-82494.
3 is driven, its movement is represented by the longitudinal axis 7, the steering member 6,
It is transmitted to the bracket 3 of each front wheel 4 via the tie rod 5 and the like.

However, in the case of a model 4WD or a model precursor, the steering mechanism 24 shown in FIG. 3 cannot be used. This is because when using a 4WD or a precursor, it is necessary to arrange a differential gear between the two front wheels, and the steering member 6 and the like cannot be arranged at this position.

Therefore, it is conceivable to simulate an actual steering device of a four-wheeled motor vehicle. (Hereafter, "the actual 4WD car"
Is called "actual machine". FIG. 4 shows an example. In the case of this steering device, when a handle (not shown) is turned, the turning rod 31 for steering supported by the frame 29 is turned (arrow 3).
2). This rotation 32 results in the movement of one transmission rod 33 in the front-rear direction (arrow 34), and the bracket 36 of the right front wheel 38.
Rotates, and the direction of the right front wheel 38 changes. The bracket 36 of the right front wheel is connected to the bracket of the left front wheel 39 via a connecting rod (not shown) arranged below the front shaft 41, and the left front wheel 39 changes its direction in conjunction with the right front wheel (left The bracket of the front wheel 39 is hidden by the left front wheel 39).

[0005] Incidentally, a connecting rod 42 connects the front shaft and the frame 29. The engine output (not shown) includes a center differential gear 43, a propeller shaft 44,
Through the front shaft differential gear 46, each front wheel 38,
It is conveyed to 39. The illustration of the suspension (suspension device) is omitted.

[0006]

However, when a prototype 4WD 51 as shown in FIG. 5 was prototyped as shown in FIG. 5 by imitating the steering device 47 of the actual machine shown in FIG. 4, a remote controller (remote operation) was used.
It was found that the direction of travel of the model 4WD 51 changed or meandered on an uneven road surface even though no operation was performed. In FIG. 5, the same parts as those shown in FIG. 4 are denoted by the same reference numerals as in FIG. The same applies to other drawings. By the way, there is a limit to downsizing of the gear. For this reason, in the model 4WD 51 of FIG. 5, the front shaft differential gear 52 is relatively larger than that of the actual machine (FIG. 4) (46), and has a size substantially close to the front wheels 38, 39. I have.

The causes of the change in direction, meandering, and the like are considered to be at the following points. First, in the actual machine (FIG. 4), the lengths A1-C1 and B1-D1 of the transmission rod 33 and the connection rod 42 are considerably large. Therefore, the distances A1-B1 and C1-D1 between the transmitting rod 33 and the connecting rod 42 relative thereto are relatively small. The length A of the transmission rod 33 and the connecting rod 42
Since 1-C1, B1-D1 are large, each front wheel 38, 39
Is moved up and down, the change in the vertical angle of the transmission rod 33 and the connection rod 42 due to the unevenness is relatively small as viewed from the fulcrum A1 or B1. Therefore, even if the front wheels 38, 39 move up and down due to unevenness of the road surface, the change in the positional relationship between the fulcrum D1 and the fulcrum C1 is small, which is a factor that does not change the traveling direction or meander. (Some actual machines are provided with a mechanism for further correcting this effect.)

On the other hand, in the model 4WD 51 shown in FIG.
3 and the lengths A2-C2, B2-D2 of the connecting rods 54 are small. For this reason, the distance A2-B2 or C2-D2 between the transmission rod 53 and the connection rod 54 for them.
Is relatively large. Further, the transmission rod 5
3 and the lengths A2-C2, B2-D2 of the connecting rod 54 are small, so that when the front wheels 38, 38 move up and down unevenly, the transmission rod 53 and the connecting rod 54 viewed from the fulcrum A2 or B2 in the vertical direction. The angle change is relatively large. Therefore, when the front wheels 38, 39 move up and down due to unevenness of the road surface, the position of the fulcrum C2 relative to the fulcrum D2 changes relatively largely. In other words, the bracket 56 moves freely without moving the steering wheel.
Is uneven or uneven on the road surface, causing the traveling direction to change or meandering.

An object of the present invention is to provide a model car steering system that does not change direction or meander without permission even when the road surface is uneven in such a model 4WD or model precursor. is there.

[0010]

According to a first aspect of the present invention, there is provided a steering apparatus for a model vehicle, comprising: a steering rotating rod; a rotating member; and two transmission rods. Is rotated according to the rotation of the steering rotation rod, each active side of each transmission rod is connected to a position separated by a required distance from the rotation center of the rotation member, and each passive side of each transmission rod is Are connected to the steering arms of the respective front wheels, and the two transmission rods move relative to each other by transmitting the steering angle to the respective front wheels by the rotation of the steering rotation rods.

Further, in the steering apparatus for a model car according to claim 2,
The steering rotation rod according to the first aspect is swingable in the same direction as the relative movement of the transmission rod according to the first aspect. In the steering apparatus for a model car according to the third aspect, the first aspect or the second aspect is provided.
Are arranged in substantially the same horizontal plane.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on illustrated embodiments. FIG. 1 shows a perspective view of a steering device 61 according to an embodiment of the present invention. FIG. 7A shows a state where the vehicle is positioned on a flat road surface, and FIG. 7B shows a state where the left front wheel 39 is lifted on an uneven road surface. The basic shapes of the model 4WD and the steering device are illustrated in FIGS. 3 to 5, and there are many known examples. Therefore, in FIGS. 1 and 2, the structure of the steering device 61 according to the embodiment of the present invention is
This is shown in a simplified conceptual diagram. Specifically, each rod 73,
Each of the shafts 83 and the like is represented by a single straight line, and a bearing member 78 such as a bearing and a sleeve for rotatably or rotatably supporting them is represented by a tube. A ball joint connecting each transmission rod is represented by a black circle (the reference numeral 62 of this ball joint is given only to a part).

The steering device 61 shown in FIGS.
Is applied to a model 4WD. Originally, a relatively large differential gear similar to the one (52) in FIG. 5 is arranged between two front wheels. The illustration of this is omitted. A display of a connecting rod 42 connecting the frame 29 and the front shaft 41, a suspension, and the like is also omitted. FIG. 2 shows a stationary state of the steering device 61 according to the embodiment of the present invention on a flat road surface. FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a right side view. FIG. 1 is a conceptual diagram, and the illustration of the differential gear 52 and the like is omitted in FIG.
Is the same as

In these figures, reference numeral 63 denotes a turning shaft for steering, which is rotatably supported by a turning shaft support member 64.
A fan-shaped support plate 66 and a support member rotation shaft 67 are attached to the rotation shaft support member 64.
Are supported by a horizontal bearing member 68 arranged in the horizontal direction. Therefore, the steering rotation shaft 63 swings in the front-rear direction about the support member rotation shaft 67. The upper end of the steering rotation shaft 63 is bent into an L-shape to form a rotation shaft arm 69, and the tip is connected to the output arm 71 of the servomotor 70. A steering angle transmission rod 72 is attached to the lower end of the steering rotation shaft 63 so as to extend left and right.

Reference numerals 73 and 74 denote a left transmission rod and a right transmission rod. These rear ends are connected to both ends of the steering angle transmission rod 72 by ball joints 62. Right and left transmission rods 7
The front ends 98, 99 of the front wheels 3, 74 are the left front wheel 39 and the right front wheel
Are connected to the upper arm 76 of each bracket. In FIGS. 1 and 2, the mandrel 79 and the rotating shaft support member 81 supported by the left and right support members 78 are respectively connected to the brackets 8.
2. Reference numeral 83 denotes a rotation shaft of the front wheel.
A differential gear (not shown) is arranged between the two front wheels 38 and 39, and the output shaft is connected to the rotating shaft 83.

The lower arm 77 of each bracket is connected by a connecting rod 84. When turning left or right, the front wheels 38, 3
9 differs in the distance from the rotation center. For this reason, when the front wheels 38 and 39 turn left or right, they are not completely parallel but are located more inwardly when they are located inside. The connecting rod 84 is used to maintain the relationship between the directions of the front wheels 38 and 39 when turning left or right as described above.

The operation of the steering device 61 of the embodiment is as follows. In addition, in order to make a figure easy to see, the code | symbol which newly appears after this is shown to FIG.1 (B). Also,
For the same reason, in FIG. 1B, the reference numerals shown in FIG. 1A are omitted in principle. Thus, this model 4WD (Fig. 1,
It is assumed that a person who operates FIG. 2) rotates a steering wheel arranged on a remote controller (not shown). The movement is transmitted to the servomotor 70 via a wireless transmitter and a wireless receiver (not shown). It is assumed that the servomotor 70 rotates and, for example, the output lever 71 inclines from neutral to forward (solid arrow 86). Accordingly, the tip of the rotating shaft arm 69 rotates forward (solid arrow 87), the left transmission rod 73 moves forward (solid arrow 88), and the right transmission rod 74 moves backward (solid arrow 89). . Thereby, both the left front wheel 39 and the right front wheel 38 face to the left. When the output lever 71 is tilted rearward from neutral, each part moves in the direction of the dashed arrows 91 to 94, and both the left front wheel 39 and the right front wheel 38 face right.

Suppose, for example, that the left front wheel 39 rides on something while the model 4WD (FIGS. 1 and 2) is running (FIG. 1B). In this case, in the steering mechanism simulating the actual machine as illustrated in FIG. 5, the direction of the front wheels changed even though the servomotor 70 did not move. However, the steering device 61
Then, it was actually tested, but no such problem occurred. However, the inventor does not have sufficient equipment and knowledge to accurately analyze the movement of each transmission rod 73 and the like. For this reason, it is not possible to give a precise reason why the change in the direction of the front wheels 38, 39 has been eliminated.

Therefore, to explain within the range considered by the inventor, the steering angle is transmitted by the two relatively movable transmission rods 73 and 74 arranged in substantially the same horizontal plane;
It is considered that the main reason why the influence of such unevenness is eliminated is that the steering rotation shaft 63 can swing back and forth. That is, in FIG. 1B, the two-dot chain lines 96 and 97 indicate the positions of the left and right transmission rods on a flat road surface, and the solid lines 73 and 74 indicate the left front wheels. 39 are these positions when you get on something.

The steering device 61 having such a motion is described.
Compared with a model steering mechanism that simulates a real machine as shown in FIG. 5, for example, the biggest difference is that in the present steering device 61, the two connection points 98 and 99 on the left and right are formed by unevenness on the road surface. In contrast, in the model steering mechanism simulating the actual machine shown in FIG. 5, these connection points C2 and D2 move vertically up and down together, while It has an atmosphere. This difference causes a difference in the movement of the steering device 61 shown in FIGS. 1 and 2 from the one simulating the actual machine illustrated in FIG.
Then, it is estimated that the directions of the front wheels 38 and 39 have not changed.

However, when strictly looking at FIG. 1B, the amount of lifting at the connection points 98 and 99 is not equal to the left and right. At this point, there is a possibility that a slight difference may occur in the directions of the front wheels 38 and 39 due to the difference in the lifting amounts of the left and right connecting rods 73 and 74. However, the direction did not change in actual running. This is due to the subtle difference in the amount of lifting,
This is because the steering rotation shaft 63 swings back and forth, and acts to offset changes in the directions of the front wheels 38 and 39.

Actually, when the turning shaft support member 64 was fixed so that the turning shaft 63 for steering could not swing,
The atmosphere was such that the directions of the front wheels 38 and 39 were slightly changed due to uneven road surfaces (because the rattling of parts was not strictly controlled and the prototype was not manufactured, an accurate causal relationship could not be grasped). Nevertheless, the change in the direction was far less than that of the actual machine as illustrated in FIG. Therefore, the present invention can be implemented even in a form in which the bearing member does not swing. When implemented in this format, the invention of claim 1 is implemented. Further, as shown in FIG. 1 or FIG. 2, when the bearing member is embodied in a swingable manner, the invention according to claim 2 is embodied. Note that the left and right transmission rods 73 and 74 that relatively move may be arranged vertically. Otherwise, if they are arranged in substantially the same horizontal plane as in the embodiment 61 of FIGS.
That is, the described invention has been implemented.

Finally, a modified example will be described. The rear ends 90, 95 of the left and right transmission rods 73, 74 need only be connected at a predetermined distance from the steering rotation shaft 63. Therefore, instead of the steering angle transmission rod 72, a circular or semi-circular plate is attached to the lower end of the steering rotation shaft 63, and the rear ends 90, 95 of the left and right transmission rods 73, 74 are connected to this. You may do it. The structure for swingably supporting the steering rotation shaft 63 is not limited to the structure of the embodiment. For example, two guide rods (not shown) extending in the front-rear direction are arranged along the steering rotary shaft 63 from right and left near the middle of the steering rotary shaft 63, and are formed by these guide rods. The steering rotation shaft 63 may swing back and forth in the gap extending in the front and rear direction.

In order to facilitate understanding, in the following description of reference numerals, after each part name of the embodiment, parentheses indicate which of the constitutions in the claims corresponds. It was described in writing. However, those using the same name are excluded. In addition, the lower end of the steering turning rod corresponds to the “rotation center” described in claim 1, and when the right transmission rod 74 moves forward or backward, the left transmission rod 73 moves in the opposite direction. The rear ends 90, 95 of the left and right transmission rods 73, 74 are referred to as the "active side of the transmission rods", and the front ends 98, 99 of the left and right transmission rods 73, 74 are referred to as "relative movement". This corresponds to the “passive side of the transmission rod” referred to in item 1.

[0025]

As described above, according to the first aspect of the present invention, the turning member, which turns in accordance with the turning of the steering turning rod,
The active sides of the two transmission rods are connected to a position separated by a required distance from the rotation center, and the passive sides of the transmission rods are connected to the steering arms of the front wheels, respectively. The two transmission rods are relatively moved by the rotation to transmit the steering angle to each of the front wheels. Further, in the invention according to claim 2, the steering rotation rod is swingable in the same direction as the relative movement of the transmission rod. Further, in the invention of claim 3, the two transmission rods are arranged substantially in the same horizontal plane. Therefore, in the model 4WD, model precursor, etc., even if each front wheel moves up and down due to unevenness of the road surface, the running direction does not change or meander, unlike the steering device simulating the actual machine, and it is stable. A straight ahead can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a steering device according to an embodiment of the present invention, in which (A) shows a state on a flat road surface, and (B) shows a state in which a left front wheel is lifted on an uneven road surface. . In addition,
In order to show the rotating shaft bearing member 81 and the like, the left front wheel is shown in a transparent state (imaginary line).

FIG. 2 shows a state of the steering device according to the embodiment of the present invention on a flat road surface, where (A) is a plan view, (B) is a front view,
(C) is a right side view (in the direction of arrow CC ′ in FIG. (B)).

FIG. 3 is a bottom view showing an example of a conventional steering mechanism (actual steering wheel 5);
-82494).

FIG. 4 is a perspective view showing an example of an actual steering device of a four-wheel drive automobile.

FIG. 5 is a perspective view showing an example of a steering device of a model four-wheel vehicle simulating an actual steering device of a four-wheel drive vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Bracket 4 ... Front wheel 5 ... Tie rod 6 ... Steering member 7 ... Vertical axis 13 ... Small electric motor for steering 24 ... Steering mechanism 29 ... Frame 31 ... Rotating rod for steering 33 ... Transmission rod 36 ... Bracket for right front wheel 37: Left front wheel bracket 38 ... Right front wheel 39 ... Left front wheel 41 ... Front axle 42 ... Front axle connecting rod 43 ... Center differential gear 44 ... Propeller shaft 46 ... Front axle differential gear 47 ... Steering device 51 of actual machine 51 ... Model 4WD 52 front shaft differential gear 53 transmission rod 54 connecting rod 56 bracket 61 steering device (embodiment of the present invention) 62 ball joint 63 steering rotation shaft 64 rotation shaft support member 66 Fan-shaped support plate 67 ... Support member rotating shaft 68 ... Horizontal bearing member 69 ... Rotating shaft arm 70 ... Servo motor 71 ... Servo motor output arm 72 72 Steering angle transmitting rod (rotating member) 73 Left transmitting rod 74 Right transmitting rod 76 Upper arm (steering arm) 77 Lower arm (steering arm) 78 Bearing member 79 Mandrel 81 Rotating shaft supporting member 82 Bracket 83 Front wheel rotating shaft 84 Connecting rod 90 Left transmission rod rear end (active side of transmission rod) 95 Right transmission rod rear end (active side of transmission rod) 96 Left transmission rod 97 … Right transmission rod 98… Left connection point 99… Right connection point

Claims (3)

[Claims] A steering wheel, a rotation member, and two transmission rods, wherein the rotation member rotates in accordance with the rotation of the steering rotation rod; Each active side is connected to a position separated by a required distance from the rotation center of the rotation member, each passive side of each transmission rod is connected to a steering arm of each front wheel, and the rotation of the steering rotation rod is controlled. A steering device for a model vehicle, wherein the two transmission rods move relative to each other to transmit a steering angle to each of the front wheels. 2. The model vehicle steering apparatus according to claim 1, wherein the steering rotation rod is swingable in the same direction as the relative movement of the transmission rod. 3. The steering apparatus for a model car according to claim 1, wherein the two transmission rods are arranged in substantially the same horizontal plane.