JPH0154509B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a drive mechanism for a locking footboard of a parking device that enables unattended management and eliminates illegal parking. The parking device is locked by rotating a gear clockwise or counterclockwise using a vehicle sensor and an electric motor. That is, by rotating counterclockwise, the pin provided on the gear is disengaged from the crank, and the tread plate connected to the crank is erected, and the tread plate is locked by the engaging member, while by rotating clockwise, the pin and crank are engaged. At the same time as locking, the lock is released and the footboard is moved to fall down. However, in conventional systems, the locking member locks only at a specific position, so depending on the vehicle's height above the ground, it may not be possible to lock the treadle, leading to illegal parking. There are concerns. In addition, if there is an overload, there is no mechanism to absorb it, so mechanisms such as locking members are often damaged.For this reason, consideration must be given to providing weak points in some parts of the mechanism so that certain parts are always damaged. It was necessary. The present invention has been tried in view of the above points, and has a power transmission mechanism from an electric motor to a treadle that is elastically biased in the upright direction. By interposing a power transmission section consisting of a machining spring whose diameter changes, and by providing a cylindrical fixing member that is pressed in the radial direction by the machining spring as the diameter of the machining spring decreases, a stepless locking mechanism and overload absorption are achieved. The present invention provides a lock tread plate drive mechanism for a parking device equipped with a mechanism. An embodiment of the present invention will be described below based on the drawings. A speed reduction mechanism 2 is connected to a DC motor capable of forward and reverse rotation or an AC motor 1 configured to be capable of forward and reverse rotation, and a bevel gear 3 is connected to this speed reduction mechanism 2. The bevel gear 3 meshes with the bevel gear 6 of a spur gear 4 and a bevel gear 6 which are interconnected via a joint spring 5 in the form of a machining spring. As shown in FIG. 3, the joint spring 5 is inserted in a twisted state into the cylindrical hollow parts of the spur gear 4 and the bevel gear 6, and is formed in axial notches 4a and 6, respectively.
The end part fits into a. Further, the joint spring 5 is arranged so that the diameter of the coil becomes smaller as the electric motor 1 rotates in the direction of raising the footboard, which will be described later, so that it functions as a spring joint.
Furthermore, a cam (not shown) is formed on the bevel gear 6 as a rotation angle detection means, and the cam detects both the end of the raising operation of the treadle and the end of the lowering operation, and stops the electric motor 1. let The spur gear 4 has a built-in one-way clutch that idles when the treadle is upright and does not idle when the treadle moves down, and is selectively controlled by the electromagnetic brake 7 only when the treadle is in the direction of falling down. It meshes with the spur gear 8 which is braked and held. A spur gear 8 is a spur gear 1 that is rotatably attached to a fixed shaft 9 that is a cylindrical fixed member.
It meshes with 0. Convex portions 11 and 12 are formed on the spur gear 10, and a fixed shaft 9 is formed on the convex portion 12.
One end of the maki spring 13 wound around is locked,
The other end of the maki spring 13 is attached to a convex portion 15 of a rotating flange 14 that is rotatably attached to the tapered portion of the fixed shaft 9.
is locked. The spring 13 is twisted and its diameter changes due to the phase difference between the spur gear 10 and the rotary flange 14 when the treadle is raised or when an external force is applied to the treadle in the direction of lodging. A pin 16 is fixed to the rotating flange 14, which engages when the difference in rotation angle relative to the convex portion 11 formed on the spur gear 10 reaches a predetermined value, and thereafter transmits 100% of the rotational force of the spur gear 10. Furthermore, one end of the link 17 is rotatably attached. The other end of the link 17 is rotatably attached to a crank 20 which is connected to a shaft 19 fixed to the footboard 18. Tread 1
A treadle spring 21 is wound around the shaft 19 of the treadle 8, and the end of this treadle spring 21 is engaged with a pin 22 fixed to a fixed part and a pin 23 fixed to a crank 20, thereby raising the treadle 18. elastically biased in the direction. Note that 24 is a housing of the device, and 25 is a bolt for fixing the fixed shaft 9 to the housing 24. Next, the effect will be explained. (i) First, the lodging operation of the footboard 18 will be explained. The electromagnetic brake 7 is demagnetized by a lodging operation command signal (not shown), the spur gear 8 becomes free to rotate, and the electric motor 1 rotates in the rotation direction b. The rotational force of the electric motor 1 is transmitted to the bevel gears 3 and 6 to twist the joint spring 5 and at the same time expand its diameter.
It comes into contact with the inner circumferential wall of the cylindrical hollow part of the bevel gear 6, is restrained, and is pressed. Therefore, the joint spring 5 transmits almost 100% of the rotational force from the bevel gear 6 to the spur gear 4. When the spur gear 4 rotates, the spur gear 10 rotates in the c rotation direction via the spur gear 8,
The locking spring 13 is loosened, the frictional force between the locking spring 13 and the fixed shaft 9 is reduced, and the braking and holding of the rotating flange 14 due to the frictional force is released. When the spur gear 10 further rotates, the protrusion 11 formed on the spur gear 10 engages with the pin 16, and the rotating flange 14 rotates integrally with the spur gear 10, resisting the erecting elastic force of the treadle spring 21. The footboard 18 is moved downward via the crank 20 and the shaft 19. Then, when the footboard 18 is almost completely lowered and laid down, a stop signal is sent to the electric motor 1 via a cam (not shown) due to the rotation of the bevel gear 6 almost at the same time as the falling down, and the electric motor 1 is stopped and the prescribed operation is completed. . (ii) Next, the raising operation of the footboard 18 will be explained. When a vehicle sensor (not shown) detects a vehicle,
The electric motor 1 rotates in the rotation direction a. The rotational force of the electric motor 1 is transmitted to the joint spring 5 via the bevel gears 3 and 6, twisting the joint spring 5 and reducing its diameter at the same time. Therefore, a gap is created between the joint spring 5 and the inner circumferential walls of the spur gear 4 and bevel gear 6, and the joint spring 5 transmits rotational force to the spur gear 4 as an elastic joint. Then, the spur gear 10 rotates in the d rotation direction, and the protrusion 11 and pin 1
6 is released, the rotating flange 14 becomes free to rotate, and the tread plate 18 rises due to the erecting elastic force of the tread plate spring 21. When the treadle 18 hits the bottom of the vehicle, the rotating flange 14 stops rotating, and the rotation of the electric motor 1 tightens the machining spring 13, increasing the pressing force on the fixed shaft 9, which acts between the machining spring 13 and the fixed shaft 9. The frictional force increases. Due to this increase in frictional force, the spur gear 4,
Since the load acting on 8, 10, etc. increases,
The joint spring 5 is further twisted by the electric motor 1, and the frictional force between the machining spring 13 and the fixed shaft 9 is increased. Thereafter, the electric motor 1 is stopped by a cam that moves integrally with the bevel gear 6, and the electromagnetic brake 7 is activated to brake and hold the spur gear 8. At this time, if the torque acting on the spur gear 10 due to the restoring torque of the joint spring 5 is T, and the contact angle between the spring 13 and the fixed shaft 9 is θ, the maximum allowable load torque T' that allows the treadle 18 to maintain its holding state is T'=
It is expressed as Te〓〓. Here μ is Makibane 13
is the friction coefficient between the fixed shaft 9 and the fixed shaft 9. For example, Table 1 shows the results when the friction coefficient μ=0.1 and θ=2πN (N is the number of turns of the spring 13 around the fixed shaft 9).

[Table] In this way, by adjusting the number of turns N of the spring 13 around the fixed shaft 9 and the restoring torque of the joint spring 5 according to the value of the friction coefficient μ, it is possible to obtain an arbitrary holding force for holding the footboard 18. can. Therefore, if the holding force is set below the allowable torque of the component, even if an overload exceeding the allowable torque is applied to the footboard 18, the spring 13 will slide on the fixed shaft 9 and rotation of the rotating flange 14 will be allowed. Because
Damage to components can be prevented. Furthermore, even if the restoring torque of the joint spring 5 is small, the spur gear 8 is braked and held by the electromagnetic brake 7, so that the footboard 18 can be stably held and fixed. Also, after the tread plate 18 hits the bottom of the car, the tread plate 1
8, the footboard 18 can be held and fixed at a height above the ground corresponding to the height of the vehicle bottom, even if the height of the vehicle bottom is arbitrary (stepless lock). On the other hand, even if a tire or the like is located on the tread plate 18 and the upward movement of the tread plate 18 is hindered,
Since the electric motor 1 is stopped by the cam just by twisting the joint spring 5 more than the amount of twisting during normal operation, it is possible to prevent the electric motor 1 from falling into an overload state and damage can be prevented. Furthermore, when the footboard 18 is lowered, the spring 13 is loosened and the frictional force acting between it and the fixed shaft 9 becomes almost zero, so that there is no loss of driving torque of the electric motor 1 due to the stepless lock configuration. The output of the electric motor 1 is effectively used, and the enlargement of the electric motor 1 is prevented. Further, the joint spring 5, the machining spring 13, etc. can suppress torque fluctuations that occur when starting the electric motor 1, and fatigue of various parts such as the gear and the electric motor 1 can be reduced. As explained above, according to the present invention, in the power transmission path between the electric motor and the footboard elastically biased in the upright direction, the diameter is twisted due to the phase difference between the rotating bodies facing each other. Since we have adopted a configuration in which a maki spring whose diameter changes is interposed and a cylindrical fixing member to which the maki spring comes into contact with pressure in the radial direction as the diameter of the maki spring is reduced, there is no possibility that an overload will be applied to the treadle or when the electric motor is started. This has the advantage of reducing the stress level generated in each part and suppressing fatigue or impact fracture in each part. In addition, since the structure is such that the treadle is held and fixed by the frictional force between the fixing member and the maki spring when standing up, it has a stepless locking structure and the treadle can be adjusted to any desired car bottom height. It can be held and fixed at a suitable height above the ground, which also has the advantage of preventing unauthorized escape.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of a locking tread drive mechanism for a parking device according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of one of the same constituent parts, and Fig. 3 is a longitudinal cross-section of a joint spring. It is a diagram. 1...Electric motor, 4, 8, 10...Spur gear, 5...
...Joint spring, 7...Electromagnetic brake, 9...
Fixed shaft, 13...Maki spring, 14...Rotating flange, 17...Link, 18...Treadboard, 19...
Shaft, 20...crank, 21...treadle spring.

Claims (1)

[Scope of Claims] 1. In a locking treadle drive mechanism for parking equipment in which a treadle can be freely raised or lowered by the operation of an electric motor, the treadle is elastically biased in a direction of standing up, and power from the electric motor is applied to the treadle. In the power transmission mechanism, a power transmission section consisting of rotating bodies facing each other and a maki spring whose diameter is twisted due to the phase difference between them is interposed, and as the maki spring diameter is reduced, the radius is A lock tread drive mechanism for a parking device, characterized in that a cylindrical fixing member that is pressed in a direction is provided. 2. The power transmission mechanism includes a power transmission mechanism section between the electric motor and a power transmission section provided with a maki spring,
A locking foot plate drive mechanism for a parking device according to claim 1, wherein a joint spring consisting of a second round spring whose diameter changes by being twisted is interposed in series. 3. The power transmission mechanism includes a plurality of power transmission rotating bodies, and any one of these rotating bodies is equipped with a brake mechanism that applies a braking force in a rotational direction corresponding to the treadle-folding side movement. A lock tread drive mechanism for a parking device according to claim 1 or 2.