JPH01317841A - Lift device for low floor small sized vehicle - Google Patents

Abstract

PURPOSE:To restrain the voltage drop of a battery and to secure a smooth ascent operation by providing a circuit extinguishing a front lamp while a lifting motor is operated in the floor ascending direction, in the body capable of getting on and off with sitting on a wheel chair and capable of traveling with seating state on the wheel chair. CONSTITUTION:The title vehicle tracts the rod 102 whose rotation is regulated, in case of rotating a feeding thread cylinder 100 via a worm gear, etc. by driving an electric motor 98 of its lift device 80, turning around a supporting shaft 84 a rear arm 82 via a link 104, fixed lever 92, cylindrical body 90 and buffer 86 and displacing a rear wheel 30 between a descent(floor face 56 ascent) position and ascent(floor face 56 descent) position. In this case, a circuit(not shown in a figure) putting off a front lamp is equipped with while the motor 98 is operated in the floor face ascent direction by an up/down switch for rotating the motor 98 positively and reversely. The reduction in the ascent capacity of the motor 98 by the voltage drop of a battery is thus prevented.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an elevating device for a small, low-floor vehicle that allows a disabled person sitting in a wheelchair, an elderly person with weak legs, etc. to easily get on and off the vehicle. be.

(Background of the Invention) The applicant has already proposed a small, low-floor vehicle as a vehicle that allows disabled and elderly people to freely get on and off the vehicle while sitting in a wheelchair (Japanese Patent Application No. 61-151424).
In other words, by moving the left and right rear wheels up and down, the rear edge of the floor surface is raised and lowered, and the rear edge of the floor surface is brought closer to the road surface, allowing the user to easily get on and off the wheelchair.

However, when such a lifting device is operated by an electric motor, the power consumption of the battery increases considerably when it is raised, and the battery voltage drops, especially if appliances that consume large amounts of power, such as headlights, are operated at the same time. may become large, reducing the motor's lifting ability.

(Object of the Invention) The present invention was made in view of the above circumstances, and it is an object of the present invention to limit the power consumption of the battery when the motor is in the ascending operation,
An object of the present invention is to provide a lifting device for a small, low-floor vehicle that prevents a reduction in the lifting ability of a motor due to a voltage drop in a battery.

(Structure of the Invention) According to the present invention, the object is to provide a body having a substantially flat floor surface with an open rear end, and to lower the rear part of the body by raising a pair of left and right rear wheels. A small, low-floor vehicle that allows passengers to get on and off the vehicle is equipped with an electric motor that raises and lowers a pair of left and right rear wheels, and an up/down switch that rotates the motor in the forward and reverse directions. This is achieved by a lifting device for a small, low-floor vehicle, which is characterized by being provided with a circuit that turns off the headlights while the vehicle is moving in the upward direction.

(Example) Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a plan view,
Figure 3 is a plan view showing the internal structure of the frame, etc.
Figure 4.5 is an explanatory diagram of the operation of the elevating device at the top and bottom positions of the car body, Figure 6.7 is a diagram showing the arrangement and operation of the position switch that similarly detects the top and bottom positions of the car body, Figure 8 is a circuit diagram.

In FIG. 3, reference numeral 10 denotes a vehicle body frame having a pipe structure, and has a substantially rectangular shape that is long from front to back. This frame 10 includes a pair of left and right lower tubes 12-a that run in the front-rear direction;
12b, an outer edge tube 14 surrounding the lower portion of the outer periphery, and a pair of upper tubes 16a and 16b located substantially parallel above the lower tube 12, bent into a substantially U-shape and having both ends fixed to the middle of the upper tube 16. A middle tube 18 is fixed to the front end of the upper tube 16, and a suitable cross member connects these.

In this figure, reference numeral 20 denotes a front steering wheel, and a front fork 22 that holds this front wheel 20 is held by a steering shaft cylinder 24 fixed to the frame IO so as to be rotatable left and right. A handle barrel 26 is arranged behind the steering shaft barrel 24, and a handle shaft (not shown) is held in the handle barrel 26. A handlebar 28 shown in FIG. 1.2 is fixed to the upper end of this handle shaft, and a brake lever 29 is attached thereto. This brake lever 29 can be locked in the pulled position, that is, the brake applied position, and when locked, it becomes a parking brake lever. A parking brake switch 216 is attached to this brake lever 29 to detect that it is locked. The lower end of the handlebar shaft is connected to the front fork 22 by an i-link (not shown), and the front wheel 2 is connected to the handlebar 28.
0 rotates in conjunction.

Reference numerals 30a and 30b are a pair of left and right rear wheels, which can be moved up and down by a lifting device 80, which will be described later. 32 is a forced air-cooled engine disposed on the left side of the front wheel 20, and its rotation is transmitted to left and right drive sprockets 38a and 38b via a V-belt continuously variable transmission 34 and a differential gear 36. The rotation of these sprockets 38a and 38b is controlled by the chain 4.
It is transmitted to each rear wheel 30 by 0a and 40b. Exhaust gas from the engine 32 is guided to a muffler 44 located on the right side of the front wheel 20 by an exhaust pipe 42 passing in front of the front wheel 20, and further passes through the lower chain 12b on the right side and is discharged rearward. 4
6 is a fuel tank, 48 is a lubricating oil tank, 50 is a battery, and 52 is an air cleaner attached to the upper surface of the transmission 34.

In FIG. 1.2, 54 is a body integrally molded from synthetic resin, and includes a substantially flat floor surface 56 and this floor surface 5.
It has a front upright wall 58 and left and right upright walls 60a, 60b which are formed in a substantially box shape with a downwardly open cross section and continuously surround the front and right and left sides of the vehicle. The front wheel 20 and the engine 32
etc. are located within the front upright wall 58. The rear part of the floor surface 56 opens rearward from between the left and right standing walls 60a and 60b.

Reference numeral 62 denotes a U-shaped wheel stop that crosses the rear opening of the body 54 from side to side, and both ends thereof are rotatably attached to the frame IO. This car stop 62 is a lifting device 8 which will be described later.
0 and the emergency lever 70, and in the solid line position in Fig. 4, the movement of the wheelchair is restricted as shown in Fig. 1, and in the position shown in Fig. 5, it enters the recess 64 formed in the floor surface 56 to prevent the wheelchair from getting on and off. enable. Further, a protector 66 made of resin is wrapped around the wheel stopper 62 at a position where the wheels of the wheelchair pass through.

Grip bars 68a and 68b are attached to the upper portions of the left and right upright walls 60 of the body 56, and allow the driver to sit on the wheelchair and grip it to get on and off the wheelchair. In Figure 1.2, 70 is an emergency lever protruding from the left standing wall 60a, 72 is a forward/reverse switching lever protruding from the right standing wall 60b, 74 is a headlamp, 76 is a pair of left and right direction indicator lights, and 78 is a tail light. It is.

Next, the elevating device 80 that raises and lowers the floor surface 56 by moving the rear wheels 30 up and down will be explained. Since this device 80 is made symmetrically with the exception of the emergency lever 70, only the left side will be explained. The rear wheel 30 is supported on both sides by an inverted T-shaped rear arm 82.

84 is a support shaft portion of this rear arm 82. The rear end of a cylindrical shock absorber 86, which integrates a hydraulic damper and a coil spring, is pivoted to the top of the rear arm 82. The other end of this shock absorber 86 is pivotally attached to the rotating end of a support lever 88. The support lever 88 is a cylindrical body 9 that is pivotally supported by the frame lO.
0 is integrally fixed. A fixed lever 9 is attached to the cylinder body 90.
2 is fixed, and this fixed lever 92 is swung back and forth by an electric motor 98 as shown in FIG. 4.5.

That is, the motor 98 rotates the feed screw cylinder 100 by an ohmic gear (not shown), and a rod 102 whose rotation is restricted is inserted into the feed screw cylinder 100, and the rear end of this rod 102 engages the link 104. It is connected to a fixing lever 92 via. As a result, the rotation of the motor 98 causes the rod 102 to move back and forth, and by moving the rod 102 back and forth, the fixed lever 92, the cylinder body 90, the support lever 8
8 rotate together to move the rear arm 82 between the rear wheel lowered position (the highest position of the vehicle body) in Figures 4 and 6 and the rear wheel raised position (the lowest position of the vehicle body) in Figure 5.7. It can be rotated. Note that in the uppermost position of the vehicle body in FIG. 4, the support lever 88
comes into contact with a stopper 106 fixed to the upper tube 16 from below.

The wheel stopper 62 is connected to this lifting device 8 by a link 108.
0, it is in a horizontal position at the top of the vehicle body to restrict the movement of the wheelchair (Fig. 4), and is housed in the recess 64 at the bottom position (Fig. 5).

Chain guides 110° 112 are fixed to the rear arm 82, and these chain guides come into contact with the chain 40 to prevent the chain 40 from becoming slack when the rear wheels are in the lowered position (FIG. 5).

In addition, this elevating device 80 is designed so that in an emergency, by pulling the emergency lever 70 backward, only the wheel stopper 62 is lowered (phantom line in Fig. 4), and the wheelchair can be lowered backwards while the floor remains raised. .

Next, the motor and headlight circuit of this lifting device 80 will be explained with reference to FIG. In this figure, 98a and 98b are the left and right electric motors, 200 is a DC power supply, 202 is an up/down switch (hereinafter referred to as a UD switch), 204 is two alternately turned on contacts 204c and 204b, and another normally closed contact 204C. It is a main switch with This main switch 204 also operates and stops the engine 32.

206a and 206b are up relays and down relays having normally closed contacts that open in conjunction with the UD switch 202.

Reference numerals 208a and 208b denote a pair of left and right uppermost position switches 210 for detecting the uppermost position of the vehicle body from the left and right rear wheel positions, that is, the rotational position of the support lever 88 as shown in FIG. 6.7.
A and 210b are a pair of left and right lowest position switches that detect from the rotational position of the support lever 88, which is the lowest position. Each position switch 208, 210 has a normally closed contact that opens in the uppermost and lowermost positions, and these actuate the lift relay 212.
a, 212b and lowering relays 214a, 214b are turned on and off. These relays 212 and 214 are connected in series to motors 98a and 98b, respectively, and the left and right series connection circuits include the up relay 206a and down relay 206b.
are connected in parallel. In the figure, 216 is a parking brake switch that closes when the parking brake is applied, and is connected between the down contact of the UD switch 202 and the excitation coil of the relay 214.

218 is a light bulb for the headlight 74; 220 is a dimer switch for selecting high beam and low beam of this light bulb 218;
222 is a lamp switch.

One end of the light bulb 218 is connected to the motor 98a and the lifting relay 212.
a, and the other end is connected to the power source 200 via a daymer switch 220, a lamp switch 222, and a main switch 204C.

The vehicle body raising operation of this circuit is as follows.

■If you turn on the main switch 204, contact 204a
, b are turned on, and the normally open contact 204c is closed. At this time, if the lamp switch 222 is closed, the current from the light bulb 218 flows through the contact a of the relay 212, and the headlight 74 is turned on. Note that the lamp switch 222
In a vehicle that does not have a headlight 74 and has a system in which the headlight 74 is always turned on, the lamp switch 222 is omitted, and when the main switch 204 is turned on, the headlight is turned on immediately.

■When the UD switch 202 is turned up, the left and right uppermost position switches 208a and 208b are conductive, so current flows from the excitation coils of the relays 212a and 212b through the uppermost position switches 208a and 208b, and the relay 2
The contacts 12a and 212b are electrically connected to the a side.

Since the relay 212 is switched to the a side, the light bulb 218
The ground side of the power supply 200 is opened and has almost the same voltage as the power supply 200. As a result, the current in the light bulb 218 is cut off and the light goes out.

■The left and right motors 98 are connected to the relay 212 from the power supply 200.
a, a contact of 212b, b of relay 214a, 214b
A current flows through the contacts and rotates the floor surface 56 in a direction that raises it.

' ■When the floor surface 56 reaches the highest point, the highest position switch 2
08a and 208b become non-conductive and relays 212a and 21
In order to release the excitation of relay 2b, the contacts of relays 212a and 212b return from the a side to the b side, the current to the motor 98 is cut off, and the motor 98 stops. At this time, if the left side finishes lifting earlier due to the difference in the distributed load on the floor surface, the left motor 98a stops first, and the right motor 98b also stops as soon as the lifting ends. In this embodiment, since the blinking of the light bulb 218 is linked to the relay 212a of the left motor 98a,
When the left motor 98a finishes raising, the light bulb 218 lights up again.

The vehicle body lowering operation is as follows.

■Turn off the main switch 204. (Contact 204b
Continuity) ′ ■Activate the parking brake. (Parking brake switch 216 conducts) ■Set the UD switch 202 to the town side.

■Since the left and right lowest position switches 210a and 210b are conductive, the current flows to the lowering relays 214a and 214b.
From the excitation coil to the left and right lowest position switches 210a, 2
10b, and conducts the contacts of relays 214a and 214b to the a side, respectively.

The relay 214a is connected to the motor 98 from the power supply 200.
, 214b and the B contacts of the relays 212a and 212b, the current flows in the opposite direction to the direction when the floor is raised, lowering the floor.

■When the floor surface reaches the lowest point, the lowest position switch 210 becomes non-conductive and the relay 214 is de-energized, so the contacts of the relay 214 return from the a side to the b side, and the power to the motor 98 is turned off. The power is cut off and the motor stops for 9 days. At this time, if, for example, the left side completes its descent earlier due to the difference in the distributed load on the floor, the left motor 98a will stop first, and the right side will also stop as soon as it has finished its ascent.

Note that the diodes 218a=d in the circuit are connected to the relays 212.
214 for self-holding, and can continue raising and lowering the floor surface without continuously operating the UD switch 202. Furthermore, the relays 206a and 206b are activated by operating the UD switch 202 to the opposite side when it is desired to stop the ascending or descending operation, and are used to temporarily stop the ascending/descending operation.

In this embodiment, the headlight 74 is turned off by the relay 212a of the motor 98a, so a dedicated relay is unnecessary and the number of parts can be reduced. Furthermore, it is not only the headlights 74 that are turned off while the vehicle body is being raised, but also the operation of the taillights 78 and other electrical components may be stopped.

(Effects of the Invention) As described above, the present invention is configured to turn off the headlights when the motor is operated in the direction of raising the vehicle body, so that the battery current decreases while the vehicle body is being raised. Battery voltage drop can be suppressed. Therefore, it is possible to prevent the motor's lifting ability from decreasing.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a plan view,
FIG. 3 is a plan view showing the internal structure of the frame, etc.;
FIG. 5 is an explanatory diagram of the operation of the elevating device at the top and bottom positions of the vehicle body, FIGS. 6 and 7 are diagrams similarly showing the arrangement and operation of the position switch, and FIG. 8 is a control circuit diagram. 56... Floor surface, 74... Headlight, 80... Lifting device, 98... Motor. 202...Up/down switch. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Scope of Claims] A small, low-floor vehicle that includes a body that has a substantially flat floor surface that is open at the rear, and that allows the rear part of the body to be lowered by raising a pair of left and right rear wheels, making it possible to get on and off from the rear of the floor surface. The vehicle is equipped with an electric motor that raises and lowers a pair of left and right rear wheels, and an up/down switch that rotates the motor in forward and reverse directions.
An elevating device for a small, low-floor vehicle, characterized in that a circuit is provided for turning off a headlight while the motor is operated in the direction of raising the floor surface by the up/down switch.