JPH0616090A - Driving device of auxiliary step for getting on and off - Google Patents

Abstract

PURPOSE:To provide a driving device of an auxiliary step for getting on and off which is projected at an adequate position at the lower side of a step so as to facilitate passengers such as old persons in the getting on and off time, and stops the projecting operation automatically when the auxiliary driving device contacts to an obstacle, a human body, and the like in the projecting operation, and furthermore, does not be locked in the projecting condition even though a trouble is generated in the wiring and the like. CONSTITUTION:An auxiliary step provided at the lower side of a step of the getting on and off position is held by a link mechanism which is deformed flexibly, to allow to project and contract freely, the link mechanism is connected to an output arm, and when an external force against the driving force from a motor operates to the output arm, the external force is transmitted to a ring gear 40 by the autorotation of a planetary gear 38 whose revolution is stopped by a driving force from a sun gear, and an eccentric cam 45 is rotated through a pinion. As a result, an operation plate 50 is displaced to the projecting direction against a spring 55, and a switch to turn on and off the operation of the motor is turned off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a drive device for an auxiliary step provided at a step of an entrance / exit of a high-floor vehicle such as a bus.

[0002]

2. Description of the Related Art In a vehicle such as a large bus or a minibus having a high vehicle height, which is provided at a high step of the entrance / exit, in order to make it easier and safer for the elderly, children, and persons with physical disabilities to get on and off. It is necessary to provide an auxiliary step at a position one step lower than the step. In addition, it is necessary to consider that this auxiliary step projects downwards so that an old person or the like can easily get on his / her legs when getting on / off the vehicle, and that it does not hinder the traveling by retracting when not getting on / off the vehicle.

From such a point, an auxiliary step as shown in FIG. 6 has been developed. In this auxiliary step, four arms 102 are pivotally supported on the lower surface of the step 101, and a plate-shaped auxiliary step piece 103 is pivotally supported on the tip of each arm 102. Further, the auxiliary step piece 103 is configured so that it can be moved back and forth between a projecting position shown by a solid line and a retracted position shown by a dotted line by a motor and a worm wheel (not shown). When an aged person or the like gets on and off, the switch provided in the driver's seat is turned on so that the auxiliary step piece 103 is projected to facilitate the getting on and off, and at the end of getting on and off, the switch is turned off to put the auxiliary step piece on the underside of the vehicle body. Evacuate to.

However, since the driving step causes the auxiliary step to project to the side of the vehicle body, when the projecting step collides with an obstacle such as a curb or a person's leg and damages the obstacle or the person's leg, or is assisted by an overload. This causes problems such as damage to the drive mechanism of the step. Particularly, in the case of a route bus, the frequency of use of the auxiliary step is high, and therefore the risk of the damage accident is high and the drive mechanism is easily deteriorated with time.

Conventionally, when the drive mechanism is stopped due to a wiring failure or the like, the auxiliary step is in a protruding state,
Since the auxiliary step was locked in the protruding state, the driving had to be stopped to prevent danger.

[0006]

It is an object of the present invention to provide an auxiliary step provided at a step of an entrance / exit of a high-floor vehicle so as to project to an appropriate place below the step at the time of getting on / off to be used by a passenger such as an old man and the like, and an obstacle during the projecting operation of the auxiliary step. The object of the present invention is to provide a drive device for an auxiliary step for getting on and off, which automatically stops the protruding operation when it comes into contact with a human body, etc., and does not lock the auxiliary step in the protruding state even if a failure occurs in wiring or the like. There is.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a vehicle having an auxiliary step on the lower surface of the step of an entrance / exit, which can be inserted and protruded toward the side of the vehicle body.
The link mechanism is fixed to the lower surface of the vehicle body and is supported by a link mechanism that expands and contracts so that the link mechanism can be inserted into and out of the vehicle. The link mechanism is connected to an output arm of the drive mechanism. The planetary gear mechanism is transmitted through a planetary gear mechanism provided in the casing of the mechanism, and the planetary gear mechanism is rotatably supported by an output shaft integrally formed with the output arm, and a plurality of planetary gears, and an inner peripheral side of each planetary gear. A sun gear that is positioned and constantly meshes with these, and that transmits the driving force from the motor to the planetary gears,
The planetary gear is provided with a ring gear which has an inner peripheral portion and a gear portion which is located on the outer peripheral side and always meshes with the planetary gear and also has a gear portion on the outer peripheral surface. While rotatably supporting the eccentric cam, the eccentric cam is fixed to the shaft of the pinion gear, and the operation plate movable between the protruding position and the retracted position is engaged with the outer peripheral surface of the eccentric cam. The actuating plate is constantly pressed against the outer peripheral surface of the eccentric cam by a spring, and when the actuating plate is pressed against the outer peripheral surface of the eccentric cam by the spring force, the pinion gear locks the ring gear. Is transmitted to the output arm by the revolution of the planetary gear, and when an external force against the driving force from the motor acts on the output arm, , The driving force from the sun gear is transmitted to the ring gear by the rotation of the planetary gear that has stopped revolving, and by rotating the eccentric cam via the pinion, the operating plate is displaced in the protruding direction against the spring, It is characterized in that a switch for turning on and off the operation of the motor is turned off.

Further, a switching lever is arranged between the spring and the operating plate to cut off a pressing force from the spring on the operating plate to switch to a manual operation.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the preferred embodiments shown in the accompanying drawings. Figures 1 (a) and (b)
Is a front sectional view showing the overall structure of one embodiment of the present invention ((b)
2 is a plan view, and FIG. 3 is a front view showing a stored state of the auxiliary step. The auxiliary step 1 is held in a horizontal posture by a link mechanism 4 that is fixed to a vehicle body lower surface 2 of a vehicle such as a bus and expands and contracts. The link mechanism 4 is connected to an output arm 7 of a drive mechanism 6 via a connecting rod 5. Has been done.

The link mechanism 4 is a pair of fixed bases 10 that are fixed to the lower surface 2 of the vehicle body so as to be opposed to each other at a predetermined interval.
And a pair of fixed-side shafts 1 that are spanned between the fixed bases 10.
1a, 11b and four link pieces 12, 13 whose upper ends are pivotally supported by axial ends of the fixed-side shafts 11a, 11b.
And the pivot shafts 15 and 1 at the lower ends of the link pieces 12 and 13, respectively.
6, an auxiliary step base portion 1a which is pivotally connected to each other and is integrated with the auxiliary step 1, and an inner fixed side shaft 11b.
And a short first diagonal link 18 that is pivotally supported at one end and extends diagonally (outwardly and diagonally downward), and one end is fastened to the other end of the first diagonal link 18 by a pin 20. A second diagonal link 19 that is pivotally attached and has a free end at the other end. A reinforcing plate 22 having an L-shaped cross section is fixed from the outer side surface to the bottom surface of the outer link piece 12,
The reinforcing plate 22 prevents the link mechanism 4 from swinging back and forth.

The pin 20 pivotally supports the tip of the connecting rod 5, and when it projects in the projecting direction indicated by the arrow in FIG. 1 (a), the two diagonal links 18, 19 are substantially straight as shown. The pin 20 is pushed outward (to the left in the drawing) so that the shape becomes like. At this time, the free end portion 19a of the second diagonal link 19 abuts the bottom corner portion of the reinforcing plate 22 so that the link mechanism 4 can maintain the projecting posture of FIG. 1 (a).

Reference numeral 25 in FIG. 2 denotes an air damper, which is constantly urged in the direction of the arrow in order to store the entire link mechanism 4 in the retracted posture shown in FIG.

The connecting rod 5 reciprocates in the projecting direction and the retracting direction when the output arm 7 connected to the output shaft 30 of the drive mechanism rotates in the forward and reverse directions, and when projecting, the linking mechanism 4 as shown in FIG. In the projecting posture, the auxiliary step 1 is projected to the side of the vehicle body, and when retracted, the link mechanism 4 is contracted by the cooperation with the air damper 25 as shown in FIG.

FIG. 4 is a plan sectional view showing the structure of the driving mechanism 6, and FIGS. 5 (a) and 5 (b) are a front vertical sectional view and a right side view. The output shaft 30 that integrally supports the base end portion of the output arm 7 has a disk-shaped support plate 32 at the upper end thereof, and the center shaft 33 is coaxially and integrally formed with the output shaft 30 from the center of the support plate 32. It is protruding. The output shaft 30 and the center shaft 33, which are coaxially arranged and rotate relative to each other, are rotatably supported by a casing 35. A sun gear 33a is formed on the outer circumference of the center shaft 33, and an input gear 33b is integrated on the center shaft 33 which is displaced from the sun gear 33a. The worm gear 34, which is a gear, is meshed. The motor is integrally fixed to the casing 35.

The driving torque from the worm gear 34, which is the output shaft of the motor, is input to the input gear 33b, the center shaft 33,
It is transmitted to the output arm 7 via the planetary gear 38 and the output shaft 30 which will be described later, and operates the link mechanism 4. The output shaft 30 also rotates in the forward direction by driving the motor in the forward direction, and the connecting rod 5 is moved in the projecting direction via the output arm 7 to project the auxiliary step 1 to the side of the vehicle body as shown in FIG. Let When the motor rotates in the reverse direction, torque in the reverse direction is output to the output shaft 30 by the same route, so that the output arm 7 moves in the retracting direction to retract the auxiliary step 1 as shown in FIG.

The shaft 3 is provided on the support plate 32 at intervals of 120.
Three shafts 7 are provided to project, and each shaft 37 rotatably supports the shaft center of a planetary gear 38. Each planetary gear 38 is constantly meshed with the sun gear 33a. The outer diameter side of each planetary gear 38 is constantly meshed with the inner peripheral gear portion 40a of a ring-shaped ring gear 40 having inner and outer gear portions 40a and 40b, respectively.

Incidentally, the sun gear 33a and the planetary gear 3
8, the ring gear 40 and the like constitute a planetary gear mechanism.
Reference numeral 42 is a pinion gear that meshes with the outer peripheral gear portion 40b of the ring gear 40, and the shaft 4 protruding from the shaft center portion thereof.
2a is rotatably supported by a casing 35. One end of the shaft 42a projects to the front of the casing, and an eccentric cam 45 is integrated with the projecting end. As shown in FIG. 5A, the outer peripheral edge of the eccentric cam 45 is in contact with the edge of the adjacent actuating plate 50.

The operating plate 50 has an elongated hole 52 supported by a screw 51 screwed to the surface of the casing 35.
2 is configured to be movable back and forth in the length direction, and is urged in the retracting direction by a spring 55. Eccentric cam 45
When the edge portion 45a that is closest to the shaft 42a is in contact with the actuating plate 50, the actuating plate 50 is urged by the spring 55.
Since the limit switch (not shown) is turned on in the retracted position shown in (a), the driving force from the motor is transmitted to the output arm 7 via the driven gear 33b, the center shaft 33, and the output shaft 30. Limit switch is operating plate 50
The switch piece is fixed to the end face 50a of the end face 50a so that when the operating plate 50 protrudes in the protruding direction, the end face 5
0a pushes the switch piece in the same direction to turn off the limit switch body.

Explaining this in detail, the cam 55 is caused by the spring 55.
5 is held in the positions shown in FIGS. 4 and 5, the cam 45
Since the pinion gear 42 integrated with is not rotated together with the cam 45, the ring gear 40 meshing with the pinion gear 42 is locked. When the ring gear 40 is not rotating, the ring gear 4
Each planetary gear 38 that meshes with the 0 inner peripheral gear portion 40a
Can orbit the sun gear 33a about the center shaft 33 while rotating about each shaft 37. Therefore, when the drive torque from the motor is input from the worm gear 34 and the output shaft 30 rotates due to the revolution of the planetary gear 30, the link mechanism 4 is operated via the output arm 7.

When the motor rotates in the forward direction in the state where the ring gear 40 is locked and the auxiliary step 1 hits an obstacle in the process of projecting in the projecting direction, the driving torque from the motor may be countered. Since the external torque enters the output shaft 30, the rotation of the output shaft 30 and the planetary gear 38 stop revolving. Even if the planetary gear 38 stops revolving, the drive torque from the motor is still in the center gear 3.
3 is transmitted to the planetary gear 38 via the sun gear 33a of No. 3, the planetary gear 38 continues to rotate, and the planetary gear 38 rotates the ring gear 40.

When the ring gear 40 rotates, the pinion gear 42 meshing with the ring gear 40 rotates, and the eccentric cam 45 integrated with the pinion gear 42 rotates a predetermined angle from the posture shown in FIG. 5 (a), so that the edge farthest from the shaft 42a is rotated. Part 45b or the edge 4
The edge near 5b abuts the operating plate 50, moves the operating plate 50 in the protruding direction against the spring 55, turns off the limit switch, and stops the motor.

Therefore, for example, when the auxiliary step 1 collides with an obstacle such as a curb or a leg of a person in the process of the auxiliary step 1 projecting due to the normal rotation of the motor, the torque in the normal rotation direction of the motor is output through the output arm 7. Since a reverse torque is applied in the direction of reducing the force, the cam 45 operates the operating plate 50 to turn off the limit switch to stop the motor and prevent damage to the auxiliary step due to obstacles and damage to the human body due to the auxiliary step. be able to.

Reference numeral 60 in FIGS. 4 and 5 is a lever for switching to manual operation.
0 is rotatably supported on the base end of the shaft member 61 holding the spring 55, and the end face 50 of the operating plate 50 is rotated by the spring 55.
It is always pressed against a. A disk-shaped cam member 62 is integrated with one surface of the lever facing the operation plate 50, and a cam surface 62a is formed on the cam member 62 and is engaged with a cam follower 63 (fixed) protruding from the casing of the drive mechanism. Put together. As shown in FIG. 5 (a), the cam follower 63
The spring 55 is in an expanded state and urges the operating plate 50 in the retracted direction when the lever 60 has fallen into the recess of the cam surface 62a. Since the cam followers 63 relatively move along the lever 60, the lever 60 as a whole moves in the protruding direction against the spring 55. In this way, the cam member 62 moves the operating plate 50.
Away from the spring 55 through the actuating plate 50 until then.
The eccentric cam 4 held in the posture shown in Fig. 5 (a) by
5 (pinion gear 42) is in a free state and the ring gear 40 is also in a free state, so that the output arm 7 can be manually operated. Simultaneously with the shift to the manual operation, the air damper 25 operates to retract the auxiliary step to the lower surface of the vehicle body.

The above-described embodiment is merely an example, and all configurations that achieve the functions and effects of the present invention are included in the scope of the present invention. Therefore, for example, the location of the eccentric cam,
The location of the limit switch can be changed in various ways.

[0025]

As described above, according to the present invention, the auxiliary step provided at the step of the entrance / exit of a high-floor vehicle is projected to a proper place below the step at the time of getting on / off to be used by passengers such as an elderly person and assisted. When contacting an obstacle, human body, etc. during the protruding operation of the step, the protruding operation is automatically stopped,
Further, even when a failure occurs in the wiring or the like, it is possible to prevent the auxiliary step from locking in the protruding state.

[Brief description of drawings]

1A and 1B are a front cross-sectional view (A-A cross-sectional view of (b)) and a side view showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1 (a).

FIG. 3 is a front view showing a stored state of an auxiliary step.

FIG. 4 is a plan sectional view showing a configuration of a drive mechanism 6.

5A and 5B are a front vertical sectional view and a right side view.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 auxiliary step, 1a step base, 2 vehicle body bottom surface, 4 link mechanism, 5 connecting rod, 6 drive mechanism, 7 output arm, 10 fixed base, 11a, 11b fixed side shaft,
12, 13 Link piece, 15, 16 Pivot shaft, 18 First diagonal link, 19 Second diagonal link, 20 Pin, 22 Reinforcing plate, 25 Air damper, 30 Output shaft,
32 support plate, 33 center shaft, 33a sun gear,
33b input gear, 34 worm gear, 35 casing, 37 shaft, 38 planetary gear, 40 ring gear, 45 eccentric cam, 50 working plate, 51 screw, 52
Slotted hole, 55 spring, 60 switching lever

Claims (2)

[Claims] 1. A vehicle having an auxiliary step on a lower surface of a step of an entrance / exit, which is capable of protruding toward the side of a vehicle body, wherein the auxiliary step is supported by a link mechanism which is fixed to the lower surface of the vehicle body and expands and contracts so as to be able to protrude. The link mechanism is connected to the output arm of the drive mechanism, and the output arm of the drive mechanism transmits the driving force from the motor through the planetary gear mechanism provided in the casing of the drive mechanism, The planetary gear mechanism is located on the inner peripheral side of each planetary gear and is constantly meshed with a plurality of planetary gears rotatably supported by an output shaft integrally formed with the output arm, and the driving force from the motor is transmitted to the planetary gears. To the sun gear, and a gear part located on the outer peripheral side of the planetary gear and constantly meshing with these, on the inner periphery and also a gear part on the outer periphery. And a ring gear, wherein the casing rotatably supports a pinion gear that constantly meshes with a gear portion on the outer periphery of the ring gear, and an eccentric cam is fixed to the shaft of the pinion gear, with respect to an outer peripheral surface of the eccentric cam. Engages an actuating plate movable between the projecting position and the retracted position and constantly presses the actuating plate against the outer peripheral surface of the eccentric cam by means of a spring. When the pinion gear locks the ring gear, the driving force from the sun gear is transmitted to the output arm by the revolution of the planetary gear, and an external force against the driving force from the motor is applied to the output arm. Drive force is transmitted from the sun gear to the ring gear by the rotation of the planetary gear that has stopped revolving, By rotating the eccentric cam via the union, the actuating plate is displaced in the projecting direction against the spring, and the switch for turning the motor on and off is turned off. Drive. 2. The boarding / alighting assistance device according to claim 1, further comprising a switching lever arranged between the spring and the operating plate to cut off a pressing force from the spring on the operating plate to switch to a manual operation. Step drive.