JPH0683447A - Guided power carriage - Google Patents

Abstract

PURPOSE:To provide the guided power carriage which eliminates the need for an extra braking system, generates large torque in a low-speed range and obtains a stable speed, and travels automatically following up an external guide body such as an operator. CONSTITUTION:The power carriage consists of a base 1, wheels 8 which support it through axles 6 so that the base can travel, and a power source (DC electric motor 4) which drives the wheels 6 through an interlocking mechanism 7. This carriage is equipped with a frictional non-step speed change gear 2 which has its speed ratio (rotating speed of output shaft 5/ rotating speed of an input shaft 3) 0 included in a speed change range and coupled with the power source by the input shaft 3 and engaged with the interlocking mechanism 7 by the output shaft 5, a speed sensor (L-shaped lever 22) which detects the speed difference between the base 1 and the external guide body, and an operation mechanism (rod 24 and L-shaped crank 18) which operates the speed change element (speed change ring 10) of the frictional non-step transmission 2 on the basis of the output of the speed sensor and automatically adjusts the speed of the base 1 to the speed of the external guide body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductive power vehicle for towing or transporting which follows an external conductor of an operator or the like.

[0002]

2. Description of the Related Art A power carriage is basically composed of a base, wheels for movably supporting the base via an axle, and a power source for driving the axle via an interlocking mechanism. Known are trucks, handlift trucks, pallet trucks, platform trucks and low speed passenger cars for the disabled and the elderly.

The shifting of the power cart is generally performed by electrical control of a DC electric motor which is a power source. However, in such a direct shifting of the DC electric motor, a large torque is output in a low speed range. Since the speed of the base becomes unstable because it is not possible to easily collapse the load at the time of starting or braking, the capacity of the electric system becomes large because the current used is large, and in addition to the drive system, mechanical brakes etc. There was a problem such as requiring a braking system consisting of

In addition, the non-passenger type of the power carriage is
The operator shifts the power vehicle by using the gear shifting operation member or the like while operating the power cart without riding on it.In such a gear shifting operation, the speed of the base must be constantly adjusted to the speed that the operator fluctuates. There was a problem that it was complicated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the need for a separate braking system, generate a large torque in a low speed range and obtain a stable speed, and to automatically operate an external guide for an operator or the like. The purpose of the present invention is to provide an inductive power cart that can travel in accordance with.

[0006]

SUMMARY OF THE INVENTION An induction power vehicle according to the present invention comprises a base, wheels that movably support the vehicle via an axle, and a power source that drives the axle via an interlocking mechanism. In the power truck, the speed ratio (rotational speed of the output shaft /
The rotational speed of the input shaft) 0 is included in the speed change range, and the speed of the friction continuously variable transmission, which is connected to the power source at the input shaft and engaged with the interlocking mechanism at the output shaft, and the base and the external guide. A speed sensor for detecting a difference; and an operating mechanism for operating the speed change element of the friction continuously variable transmission based on the output of the speed sensor and automatically adjusting the speed of the base to the speed of the external conductor. To do.

The friction continuously variable transmission is disclosed in Japanese Examined Patent Publication No. 57-132.
No. 21, etc. can be preferably used, the wheels may be provided with tracks of a crawler track, and the external conductor is an operator or the like, or an induction vehicle or the like different from the power truck. Good.

The speed sensor comprises a lever tiltably supported by a stationary element including a base via a pivot axis perpendicular to the traveling direction, and is connected to an external guide at its input portion and operated at its output portion. It may be connected to the mechanism. If necessary, a handle or other connecting member for connecting with an external dielectric is provided at the input portion of the lever.

The lever has two output parts, and the tilting of the lever is operably transmitted from each output part to the speed change element of the friction continuously variable transmission through the operation mechanism, and when the vehicle is traveling forward, The lever may be tilted in the front area from the neutral position corresponding to the speed ratio of 0 at the input portion thereof, and may be tilted in the rear area from the neutral position when traveling backward. In this case, the lever in the neutral position is provided with tilting stoppers for restricting forward and backward tilting of the input portion of the lever so as to be operable in conjunction with switching of the rotation direction of the power source. It is preferable that only the tilt stopper of (1) is released and that only the tilt stopper toward the rear is released during backward traveling.

Further, a state sensor is provided on the base for detecting a ready state for use of a working device mounted so as to be usable when the vehicle is stopped or traveling at a low speed, and the speed sensor changes the speed of the friction continuously variable transmission. In the process of reaching the element, a speed increasing stopper that restricts shifting to the high speed range may be operably provided in conjunction with the output of the state sensor.

[0011]

In the above structure, when the speed sensor detects the speed difference between the base and the external guide, the operation mechanism operates based on the output, and the speed change element of the friction continuously variable transmission operates in the deceleration or acceleration direction. At the same time, the speed of the base is automatically adjusted to the speed of the external derivative. The braking of the power bogie is easily performed by decelerating the speed change element up to the speed ratio of 0 without depending on the braking system of another system.

When the speed sensor is composed of the lever, the tilting of the lever caused by the speed difference between the base and the external guide is operably transmitted from its output portion to the speed change element of the friction continuously variable transmission through the operation mechanism. To be done. Further, in the case where the lever has two output portions, it is possible to individually shift gears in the front region and the rear region from the neutral position corresponding to the speed ratio 0 during forward traveling and backward traveling. In this case, when the tilt stoppers are provided, they are operated in conjunction with the switching of the rotation direction of the power source, and the lever is tilted on one side of the front region and the rear region and the neutral position of the gear ratio 0 is set. Excessive tilting beyond the other side is automatically prevented.

Further, in the case where the speed increasing stopper is provided,
It operates when the working device detects the ready state of use of the working device, and is not originally necessary when preparing the working device for use.
Shifting to the high-speed range where unstable driving is likely to occur is automatically restricted. Such a mechanism can be suitably used, for example, in a mobile X-ray imaging vehicle in which an X-ray device is mounted as a working device on a power cart.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of an essential part of an induction power bogie according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of an essential part of an induction power bogie according to a second embodiment of the present invention. 3 and 4 are side views of the T-shaped lever shown in FIG. 2, and FIG.
(B) shows each tilting state at the time of traveling backward. FIG. 4 is a plan view of the tilt stopper shown in FIGS. 2 and 3, and FIG. 5 is a side view of a main portion of an induction type power truck according to a third embodiment of the present invention. In use, (B) shows each state when using the X-ray apparatus.

In the first embodiment shown in FIG. 1, the base 1
A frictionless continuously variable transmission 2 including a speed ratio of 0 in the speed change range is provided at a lower portion thereof, and an input shaft 3 thereof has a DC electric motor 4 as a power source.
And the DC electric motor 4 can be driven by a storage battery (not shown), and the input shaft 3
An axle 6 is rotatably engaged with the output shaft 5 which is coaxial with the output shaft 5 at a right angle to the output shaft 5 via an interlocking mechanism 7 and
The wheels 8 are fixed to the vehicle, and the axes of the input shaft 3 and the output shaft 5 are arranged in the traveling direction with the former as the front.

The friction continuously variable transmission 2 includes a small diameter transmission wheel 9 connected between the input shaft 3 and the output shaft 5 and connected to the input shaft 3.
A non-rotating speed change ring 10 which is a speed change element, a large diameter transmission wheel 12 connected to the output shaft 5 via a pressure adjusting cam 11, and frictionally engaging with the three transmission members under a force balance. A plurality of conical rotors 13 that perform a planetary motion are housed in a case 14, and shifting is performed by moving the shift ring 10 along the conical generatrix of the conical rotor 13 in the axial direction to shift gears. When 10 is frictionally engaged with the outermost peripheral portion of the conical rotor 13, the speed change range becomes 0 and the rotational speed of the output shaft 5 becomes 0. The speed change ring 10 is integrated with a speed change lever 15 slidably contacting the case 14 so as to be movable in the axial direction, and is constantly biased by a compression coil spring 16 in a direction in which the speed ratio becomes zero.

An L-shaped crank 18 is supported on the case 14 via a pivot 17 parallel to the axle 6, and the longitudinal end of the L-shaped crank 18 and the front end of the speed change lever 15 are pivoted via a pin shaft 19. It was worn and there were 20 handrails on the base 1.
And an L-shaped lever 22 as a speed sensor is tiltably provided at an end of the handrail 20 via a pivot 21 parallel to the axle 6, and an L-shaped lever 22 as an input portion is provided.
A handle 23 is provided at the tip of the vertical axis, and an L-shaped lever 22 as a horizontal axis tip and an L-shaped crank 18 as a horizontal axis tip as output parts are pivotally attached via respective ends of a rod 24 and a pin shaft 25. When the L-shaped lever 22 is tilted forward or backward by the handle 23, the transmission ring 10 moves to the rod 24.
And the L-shaped crank 18 and the like, respectively, to move in the acceleration direction and the deceleration direction. The rod 24, the L-shaped crank 18, and the like cooperate with each other to form an operating mechanism in the present invention.

On the other hand, the interlocking mechanism 7 has a slide gear 26 spline-engaged with the output shaft 5 so as to be interlocked with the output shaft 5 and movable in the axial direction, and a clutch operating rod 27 for moving the slide gear 26 in the axial direction. The driven bevel gear 28 provided on the axle 6 meshes with the slide gear 26 and the spur gear portion so as to be disengageably engaged with each other, and the driven bevel gear 28 and the bevel gear portion mesh with each other at a right angle.
4 and the interlocking gear 29 supported on the output shaft 5
Is transmitted to the axle 6 through the slide gear 26, the interlocking gear 29 and the driven bevel gear 28 in sequence, and the slide gear 26 is moved relative to the interlocking gear 29 by operating the clutch operating rod 27 forward or backward. The gears are engaged or disengaged, and the transmission from the output shaft 5 to the axle 6 is blocked or connected.

In the power cart having the above-mentioned structure, for example, when an operator as an external conductor walks in the traveling direction of the base 1 while holding the handle 23 of the L-shaped lever 22, the walking speed of the worker is the base 1. When the speed is higher than the speed of 1, the L-shaped lever 22 is tilted forward by the handle 23, the transmission ring 10 is moved in the speed increasing direction through the operating mechanism, and the base 1 is speeded up. When the walking speed is lower than the speed of the base 1, the L-shaped lever 22 is tilted rearward by the handle 23, the transmission ring 10 is moved in the deceleration direction through the operation mechanism, and the base 1 is decelerated. .

Next, a second embodiment shown in FIG. 2 is one in which each shift operation is possible during forward traveling and backward traveling, and the portions other than the speed sensor and the operating mechanism are the same as those of the first embodiment. Since the structure is basically the same as the example, detailed description is omitted.

In the figure, a T-shaped lever 31 as a speed sensor is tiltably provided at the tip of the handrail 20 on the base 1 via a pivot 21 parallel to the axle 6, and is connected to the front end of the speed change lever 15 in the case 14. Of the T-shaped lever 31 as an input unit, and a wire 34 is provided at both ends of the horizontal axis of the T-shaped lever 31 as an output unit. While being attached, each wire 34 is gathered in one line, passes through the pipe 32, and is connected to the tip of the speed change operating rod 15. When the T-shaped lever 31 is tilted forward or backward in the front region from the neutral position P corresponding to the gear ratio 0 by the handle 33, or is tilted rearward or forward in the rear region from the neutral position P, the gear shift is performed. The ring 10 is moved via the wire 34 in the acceleration direction or the deceleration direction, respectively. The wire 34 and the like constitute the operation mechanism in the present invention.

The T-shaped lever 31 has a neutral position P.
A tilt stopper 35 for restricting tilting forward and backward by the handle 33 is provided in the DC electric motor 4
2, the tilt stoppers 35 are actuated so that the T-shaped lever 31 cannot be tilted forward and backward from the neutral position P, and when the DC electric motor 4 is rotated forward (for forward running). (When switching), as shown in FIG.
Only the front tilt stopper 35 is released so that the T-shaped lever 31 can be tilted forward or backward only from the neutral position P in the front region, and when the DC electric motor 4 is rotated in the reverse direction (when switching to reverse running). As shown in FIG. 3B, only the rearward tilt stopper 35 is released and the T-shaped lever 31 is released.
Can be tilted forward or backward only from the neutral position P in the rear area.

As shown in FIG. 4, each tilt stopper 35 includes a solenoid 36 arranged side by side in the lateral direction of the T-shaped lever 31, and a movable iron core 38 inserted through a compression coil spring 37 therein. And a stop piece 39 having an inclined surface on the outside is attached to the tip of the movable iron core 38. The solenoid 36 of each tilt stopper 35 is interlocked with the forward / reverse switching of the DC electric motor 4, and when the solenoid 36 is not excited, the movable iron core 38 is projected by the repulsive force of the compression coil spring 37 and the tilt stopper 35 is moved. The movable iron core 3 is activated when the solenoid 36 is energized.
8 is in a contracted state against the repulsive force of the compression coil spring 37, and the tilt stopper 35 is released. If the T-shaped lever 31 is in the high speed region in the front region or the rear region from the neutral position P, the DC electric motor 4 stops,
Even when the tilt stopper 35 operates, the T-shaped lever 3
The stop piece 39 is moved backward by pressing 1 toward the low speed region against the inclined surface of the stop piece 39, and the T-shaped lever 31
Can be easily and manually returned to the neutral position P.

Furthermore, the third embodiment shown in FIGS. 5A and 5B relates to a power truck equipped with a working device, and the power truck itself is basically the same as the second embodiment. Since they have the same structure, detailed illustration and description thereof will be omitted.

In the figure, a column 41 is vertically provided on the base 1, and an arm 42 is horizontally engaged with the column 41 so as to be movable in the axial direction and rotatable about the axis. Is provided with an X-ray device 43 as a working device, and the X-ray device 43 is stably held by the arm 42 on the center of the base 1 when not in use as shown in FIG. At the time, as shown in FIG. 5B, the base 1 is rotated forward, and a proximity switch 44 as a state sensor for detecting the presence or absence of the X-ray device 43 is provided at the center of the base 1.

The T-shaped lever 31, which is a speed sensor, is provided with a speed increasing stopper 45 for restricting a shift from the neutral position P to a high speed area in each of the front area and the rear area, and each speed increasing stopper 45 has been described above. It has the same structure as the solenoid magnet shown in FIG. 4, and the output of the proximity switch 44 is input to each speed increasing stopper 45 via the controller 46. When the X-ray device 43 is held on the center of the base 1 during movement or the like, the proximity switch 44 detects the X-ray device 43 and a signal thereof is input to the controller 46 to release the corresponding speed increasing stopper 45. At the same time, the T-shaped lever 31 can shift to a high speed range. In addition, the X-ray device 43
When the vehicle is out of the central position of the base 1 in use, the signal from the proximity switch 44 is not input to the controller 46, the corresponding speed increasing stopper 45 is activated, and the T-shaped lever 31 cannot shift to the high speed range. Therefore, high speed running in an unbalanced and unstable state is prevented.

[0027]

Since the induction type power truck according to the present invention is constructed as described above, a separate braking system is unnecessary, a large torque is generated in a low speed range, and a stable speed can be obtained. It is possible to automatically follow other people's external derivatives.

If the speed sensor is composed of a lever, the speed difference between the base and the external dielectric can be detected with a simple structure. In the case where the lever has two output parts, it is possible to change gears for forward traveling and backward traveling from the neutral position P corresponding to the speed ratio 0 in the front region and the rear region, respectively. In that case, the tilt stopper is used. When equipped, it operates in conjunction with switching of the rotation direction of the power source, and the lever can be tilted only in one of the front region and the rear region sandwiching the neutral position. Further, in the case where the speed increasing stopper is provided, it operates when the state sensor detects the ready state for use of the working device, and the shift to the high speed range is automatically restricted.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an inductive power cart according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of an induction type power truck according to a second embodiment of the present invention.

FIG. 3 is a side view of the lever shown in FIG. 2, in which (A) shows respective tilted states during forward traveling and (B) during backward traveling.

4 is a plan view of the tilt stopper shown in FIGS. 2 and 3. FIG.

FIG. 5 is a side view of a main portion of an induction type power truck according to a third embodiment of the present invention, (A) when the X-ray device is not used, (B).
Shows each state when the X-ray apparatus is used.

[Explanation of symbols]

 1 base 2 friction continuously variable transmission 3 input shaft 4 DC electric motor 5 output shaft 6 axle 7 interlocking mechanism 8 wheels 10 speed change ring 18 L-shaped crank 22 L-shaped lever 24 rod

Claims (4)

[Claims] 1. A power vehicle comprising a base and wheels for movably supporting the vehicle via an axle, and a power source for driving the axle via an interlocking mechanism. A friction continuously variable transmission that is connected to a power source at an input shaft and is engaged with an interlocking mechanism at an output shaft, a speed sensor that detects a speed difference between a base and an external guide, and based on the output of the speed sensor. And an operating mechanism that automatically adjusts the speed of the base to the speed of an external conductor while operating the speed change element of the friction continuously variable transmission. 2. A speed sensor comprises a lever tiltably supported by a stationary element including a base via a pivot perpendicular to the direction of travel, connected at its input to an external dielectric and at its output. The inductive power cart according to claim 1, which is connected to an operating mechanism. 3. The lever has two output parts, and the tilting of the lever is operably transmitted from each output part to the speed change element of the friction continuously variable transmission through the operation mechanism, so that the lever can be moved forward. The lever allows the lever to be tilted in the front region from the neutral position corresponding to the speed ratio 0 at its input portion, and allows the lever to be tilted in the rear region from the neutral position when the vehicle is moving backward. Tilt stoppers for restricting forward and backward tilting of the input section are provided so as to be operable in conjunction with switching of the rotation direction of the power source.When traveling forward, only the forward tilting stopper is released and backward traveling is performed. The inductive power cart according to claim 2, wherein only the rearward tilt stopper is released at this time. 4. A state sensor is provided on the base for detecting a ready state for use of a working device which is mounted so as to be usable when the vehicle is stopped or traveling at a low speed, and the speed sensor changes the speed of the friction continuously variable transmission. 4. The induction type power bogie according to claim 1, 2 or 3, wherein an acceleration stopper that restricts shifting to a high speed range is operably provided in association with an output of the state sensor in the process of reaching the element.