JPH02303972A - Steering device for vehicle - Google Patents

Abstract

PURPOSE:To facilitate manual steering, automatic steering and selection of these steerings, respectively, by applying a DD motor to a steering motor while always connecting an output shaft of this motor and a handle shaft respectively to a steering shaft. CONSTITUTION:A steering motor 30, consisting of a DD motor, is set up in the upper coaxially with a steering shaft 4 supported to a head pipe 3 of a vehicle, for instance, golf cart. The steering motor 30 is fixed by a bolt 32 to a bracket 31 of a car body frame 2, while an output shaft 33 of the motor is integrally molded with a boss 23 of he steering shaft 4. Further the steering shaft 4 and a handle shaft 17 are connected to each other through a link 26 or the like. Following rotation of the handle shaft 17, the steering shaft 4 and the output shaft 33 of the steering motor 30 are interlockingly rotated respectively. Now because the steering motor 30, being a DD motor, eliminates the necessity for a reduction gear, the output shaft 33 of the motor can be rotated by small torque.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a steering device for a vehicle such as a golf cart, and more particularly to one that can be operated by either manual steering or automatic steering.

(Conventional technology) At golf courses, leisure parks, parks, exhibition halls, etc.
Many vehicles are used these days. For convenience of operation, some of these vehicles can be operated by either manual steering or automatic steering, and in this case, they are usually provided with a steering shaft connected to the steering wheels. A handle shaft and an output shaft of a steering motor are respectively connected to this steering shaft.

According to the above configuration, when trying to perform manual steering, all one has to do is operate the steering wheel and rotate the steering wheel shaft (on the other hand, when trying to perform automatic steering, it is enough to automatically control the ζ motor, As a result, the wheels are steered via the steering shaft linked to the handle shaft and the output shaft of the motor.

Further, in the above-mentioned configuration, there is one in which the motor is a thrust motor, and this motor is connected to the steering shaft via a speed reducer.

By the way, in this configuration, when the steering wheel is rotated to perform manual steering, not only the above-mentioned steering shaft is interlocked, but also the output shaft of the motor is interlocked via the reduction gear. Machines generally require a large amount of force when trying to transmit an external force from their output side to their input end. Therefore, as described above, when attempting to rotate the handle shaft during manual steering, there is a disadvantage that the rotation operation becomes extremely heavy.

For this reason, in the case of the above configuration, conventionally, a switching mechanism was provided to connect only one of the handle and the output shaft of the haystack to the steering shaft, and when the handle shaft was rotated, In addition, there is a device in which the output shaft of the motor is not interlocked so that the handle shaft can be easily rotated (for example, Japanese Patent Application Laid-Open No. 63-1631
Publication No. 1).

(Problems to be Solved by the Invention) However, since the above-mentioned switching mechanism has a complicated configuration, there is a problem in that if the switching mechanism is provided in duplicate, the configuration of this hill becomes complicated.

In addition, if such a switching mechanism is provided, when trying to select between manual steering and automatic steering, the operation for this switching mechanism will increase, which will make the selection process more complicated. There is a possibility that this may occur.

(Objective of the Invention) The present invention has been made in view of the above-mentioned circumstances, and it enables selection of either manual steering or automatic steering with a simple configuration, and also provides a method for making this selection. The purpose is to make work easier.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the motor is a DD motor, and the handle shaft and the output shaft of the motor are always connected to the steering shaft. .

(for production) The effects of the above configuration are as follows.

When attempting manual steering, operate the handle 20 and adjust the steering wheel shaft! 7; the front wheels (wheels) 6 may be steered via the steering shaft 4 interlocked with this; on the other hand,
When performing automatic steering, if the steering motor 30 is operated according to a predetermined program, the front wheels (wheels) 6
is steered.

By the way, since the steering shaft 4 is always connected to the handle shaft 17 and the output shaft 33 of the steering motor 30,
During the manual steering described above, it is necessary to also rotate the output shaft 33 of the steering m motor 30.

In this case, the steering motor 30 is a DD motor,
This DD motor is a brushless servo motor used for high-precision control, and because it uses rare earth magnets, it can generate high torque even with a low voltage (12V or 24V) power source such as a car battery. It is something.

That is, when voltage is applied to this DD motor and it is operated,
The output shaft 33 can rotate through a small angle with high torque without the need for a speed reducer.

Therefore, even if the output shaft 33 of the steering motor 30 is rotated together with the rotation of the handle shaft 17 during the manual steering, the rotation of the output shaft 33 can be made lighter since the output shaft 33 is not mediated by a speed reducer. In other words, manual steering can be performed easily.

On the other hand, when performing automatic steering, it is necessary to rotate the handle shaft 17 along with the rotation of the output shaft 33 of the steering motor 30, contrary to the above, but the rotation of the handle shaft 17 can be made light. Therefore, this automatic steering can also be carried out easily.

From the above, the handle shaft 17 and the steering motor 30
Even if the output shaft 33 of the steering shaft 33 is always connected to the steering shaft 4, there is no problem (manual steering and automatic steering can be carried out easily). In order to connect only one of the 30 output shafts 33 to the steering shaft 4, the conventionally provided switching mechanism is unnecessary. - (Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

(First example) 1 to 3 show a first embodiment.

In the figure, l is a golf cart, which is an example of a vehicle.

The body frame 2 of this golf cart 1 has a circular vibrator as a frame structure, and has a head vibrator 3 at the center in the width direction of the front part 1. A steering shaft 4 is rotatably supported on the head vibe 3 so as to be rotatable about the axis of the steering shaft 4, and a front wheel 6, which is a steering wheel, is supported at the lower end of the steering shaft 4.

A pair of left and right rear wheels 7.7 are supported at the rear of the L vehicle arrangement frame 2, and the left and right rear wheels 7.7 are connected to each other by a differential gear 8. Further, a traveling drive motor 1O is attached to the same column frame 2, and the differential device 8 is interlocked and connected to this traveling drive motor 10 via a gear reduction device 11 and a chain transmission means 12. Therefore, when the running drive motor IO is operated, the power is transmitted to the differential gear 8 via the reduction gear 11 and the like, where it is distributed to the left and right and transmitted to each rear wheel 7, and is then transmitted to the rear wheels 7. The golf cart l is driven by the following.

A support frame 14 is provided to protrude upward from the rear of the vehicle body frame 2, and the upper part of the support frame 14 extends forward, and this extension serves as a support stand 15.

17 is a handle shaft, and the lower end of this handle shaft 17 is +7
The handlebar shaft 17 is rotatably supported around its axis by a lower bearing 18 provided at the front of the F body frame 2, while the upper end side of the handle shaft 17 is provided at the front and rear midway of the L support base 15. It is supported by an F section bearing 19 so as to be rotatable about its axis. A handle 20 of a bar set is attached to one end of the handle shaft 17.

A step 22 for the driver to move east is formed at the rear end of the heavy frame 2, and the handle 20 corresponds to the driver on this step 22.

A boss 23 is fixed to one end of the steering shaft 4, and a pair of left and right projecting pieces 24, 24 are protruded from the boss 23. On the other hand, a pair of left and right protrusions 25, 25 are also protruded from the lower part of the handle shaft 17. And -G protrusion 24
．． A pair of left and right turnbuckle links 2 between 25
6.26 is interposed, and the end of each link 26 is connected to the corresponding protrusion 24.25 by a ball joint 27.

Coaxially with the steering shaft 4, above the steering shaft 4 is a DD.
A steering motor 30, which is a motor, is provided, and the steering motor 30 is screwed onto a bracket 31 projecting from the front of the vehicle body frame 2 with a bolt 32.

The output shaft 33 of this steering motor 30 and the boss 23 are formed into a three-dimensional structure.

That is, the handle shaft 17, the steering motor 30, and the output shaft 33 are always connected to the L2 steering shaft 4.

34 is a battery that supplies power to each of the motors 10 and 30.

When the handle shaft 17 is rotated by operating the handle 20, the left and right links 26.
The steering shaft 4 is interlocked with 1=1 via 26, so that the front wheels 6 are steered.

In this case, the output shaft 33 of the steering motor 30 will also be linked to the rotation of the handle shaft 17, but since the steering motor 30 is a DD motor and does not require a speed reducer, the output shaft 33 can be rotated with small torque. Therefore, manual steering using the handle 20 can be performed easily.

On the other hand, when the steering motor 30 is operated, the front wheels 6 are steered by the steering shaft 4 which is interlocked with the steering motor 30.

In addition, -F golf cart l is a conbuque box 3
6, a control box 37, and a laser projector and light receivers 38 and 39. And each of the above laser projections,
When the laser beam emitted from the light receiver 38.39 is reflected by a reflection device provided in advance on the travel course and returns to the same laser projection and light receiver 38.39, the resulting laser projection and light receiver 38.39 The computer box 36 and control box 37 are
The steering motor 30 is operated via the steering wheel, that is, automatic steering is performed.

Furthermore, as shown in "-", when performing automatic steering, it is necessary to also rotate the handle shaft 17 which is linked to the rotation of the output shaft 33 of the steering motor 30, but the rotation of this handle shaft 17 is slight. Therefore, this automatic steering can also be carried out easily.

According to the above embodiment, the handle shaft 17 and the handle 20 are not easily influenced by the steering shaft 4 and the steering motor 30 due to their arrangement, so the handle shaft 17 and the handle 20 are installed at desired positions and Any desired operability can be obtained.

Also, for the same reason as above, we have decided to use the handle shaft 17 for existing golf carts that are only capable of automatic steering.
If you want to install it, it will also be easy to do so.

(Second example) FIG. 4 shows a second embodiment.

According to this, a handle shaft 17 is provided coaxially with the steering shaft 4, and the handle shaft 17 is directly connected to the upper end of the steering shaft 4. Then, the output shaft 33 of the steering motor 30
left and right projecting pieces 24 and 24 projecting from the left and right projecting pieces 24, 24, and left and right projecting pieces 25 projecting from either the steering shaft 4 or the handle shaft 17;
．． 25 are connected by a pair of left and right links 26 and 26.

When the handlebar shaft 17 is rotated by operating the handlebar 20, the front wheels 6 are steered by the steering shaft 4 which is interlocked with the handlebar shaft 17. On the other hand, when the steering motor 30 is operated, the steering shaft 4 is linked to its output shaft 33 via the left and right links 26, 26 in a l:l ratio, so that the front wheels 6 are steered.

Other structures and functions are similar to those of the first embodiment.

According to the above embodiment, the steering motor 30 is arranged as follows.
Second, since it is not easily affected by the handlebar shaft 17 and handlebar 20, it is easy to install the steering motor 30 in a desired position, such as to prevent rocks thrown up by the front wheels 6 from colliding with the steering motor 30. It becomes possible. Furthermore, if the steering motor 30 is to be attached to an existing golf cart l that is capable of only one manual steering for the same reason as above, the attachment can be easily done.

(Third example) FIGS. 5 and 6 show a third embodiment.

According to No. 2, the handle shaft 17 and the output shaft 33 of the steering motor 30 are located coaxially with the steering shaft 4, and these are connected to each other.

Therefore, by rotating the handle shaft 17 or operating the steering motor 30, the steering shaft 4 is interlocked with this, and the front wheels 6 are steered.

Note that, as shown by the imaginary line in FIG. 6, the handle shaft 17 and the output shaft 33 may be integrally molded.

Other structures and functions are similar to those of the first embodiment.

(Effects of the Invention) According to the present invention, the motor is a DD motor, and the handle shaft and the output shaft of the motor are always connected to the steering shaft, so that the following effects can be obtained.

That is, according to the above configuration, during manual steering, it is necessary to also rotate the output shaft of the steering motor, but when the DD motor is operated, the output shaft rotates at a small angle, eliminating the need for a reduction gear. can be rotated with high torque.

Therefore, even if the output shaft of the steering motor is rotated together with the rotation of the handle shaft during the manual steering, the rotation of the output shaft can be made lighter since the output shaft is not mediated by the speed reducer. In other words, manual steering can be performed easily.

On the other hand, when performing automatic steering, contrary to the above, it is necessary to rotate the steering wheel shaft via the steering shaft together with the output shaft of the steering motor, but the rotation of this steering wheel shaft can be done easily. , this automatic steering can also be carried out easily.

From the above, even if the steering wheel shaft and the output shaft of the steering motor are always connected to the steering shaft, manual steering and automatic steering can be performed without any problem. Since only one of the output shafts of the steering motor is connected to the steering shaft, there is no need for the conventional switching mechanism, and there is no need to provide the steering motor with a speed reducer. Selection of either automatic steering can be made with a simple configuration.

Furthermore, as mentioned above, since the steering wheel shaft and the output shaft of the steering motor are always connected to the steering shaft, the selection between manual steering and automatic steering is determined by operating the handle provided on the steering wheel shaft and steering It is sufficient to simply select one of the motor operations, and there is no need to perform a switching operation on the switching mechanism as described above. Therefore, the task of selecting between dynamic steering and automatic steering can be performed extremely easily.

(Margin below)

[Brief explanation of the drawing]

The figure shows an embodiment of the invention. Figures 1 to 3 show the first embodiment. Figure 1 is an overall side view, Figure 2 is an enlarged partial partial view of Figure 1, and Figure 3 is the second embodiment.
A partial partial view taken along the line II-III in the figure, FIG. 4 shows the second embodiment, and a view corresponding to a part of FIG. 1, and FIGS. 5 and 6 show the third embodiment. , FIG. 5 is a diagram corresponding to a part of FIG. 1, and FIG. 6 is a partially enlarged cross-sectional view of FIG. 5. l... Golf cart (light rain), 2... body frame, 3
・・Head vibration, 4.・Steering shaft, 6.・Front wheel (wheel)
, 17... Handle shaft, 20... Handle, 30... Steering motor, 3:3... Output shaft. Figure 4

Claims (1)

[Claims] 1. In a vehicle steering system, a steering shaft is provided which is connected to a steering wheel, and a handle shaft and an output shaft of a steering motor are respectively connected to the steering shaft, wherein the motor is a DD motor, and the steering shaft and the steering shaft are connected to each other. A vehicle steering device in which the output shaft of a motor is always connected to a steering shaft.