JP3339891B2 - Open / close synchronization device for van body truck wings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side plate (wing) of a truck body having a so-called wing-shaped van body having a structure in which a side surface of a carrier body is turned around a pivot provided on a roof side and opened and closed. The present invention relates to an opening / closing device, and more particularly to a device for preventing a wing from being opened / closed in a twisted state due to a speed difference between opening / closing devices provided before and after a loading platform.

[0002]

2. Description of the Related Art As shown in FIG. 6, a wing type van body truck has a structure in which a side plate 1 of a carrier body is pivoted around a pivot 4 provided on a roof side to repel upward and open and close. The part that is opened and closed is called a wing. Conventionally, various mechanisms have been proposed for opening and closing the wing.However, the wing opening and closing device is usually provided in front of and behind the loading platform, and the wing has a long and flexible structure and is supported by both ends to open and close. ing. A drive source is separately provided for each of the wing opening / closing mechanisms provided before and after the loading platform (both sides of the wing), and a structure in which the wing opening / closing mechanisms on both sides are connected by a long wire or shaft and driven by one driving source. There are things. In general, a hydraulic motor, a hydraulic cylinder, an electric motor, or the like is used as a driving source.

[0003]

The structure in which the wing opening and closing devices on the front and rear of the vehicle body are driven by one drive source is synchronously driven by mechanically connecting the wing opening and closing devices on both sides.
When opening and closing the wings, the wing twisting phenomenon does not occur due to the difference in the operating speed of the wing opening and closing devices on both sides.However, since the front and rear wing opening and closing devices must be connected with a long shaft or rope, the device becomes large and assembly of the body In addition, there is a problem that adjustment work for synchronizing the opening and closing devices on both sides is troublesome.

On the other hand, a structure in which the wing opening / closing devices on both sides are driven by respective individual driving sources can make the wing opening / closing device very compact, and the mounting work of the van body on the bogie is easy and short. There is a feature that can be done. In particular, when an electric motor is used as the drive source, the hydraulic piping work is not required, and the mounting of the van body can be extremely easily performed.

However, when the wing opening / closing devices on both sides are driven by individual driving sources as described above, there is a problem that the wings are twisted when the wing is opened / closed due to the speed difference between the driving sources on both sides, as shown in FIG. . This torsion is not actually as great as shown in FIG. 5, so it does not matter much when the wing is opened, but when the wing is closed, the torsion of the wing is maximized when the wing reaches the lower end, and the wing 1 is supported. There arises a problem that the lock mechanism provided between the frame 14 and the tilt 42 is disengaged, and the edge 43 of the wing does not fit in a predetermined place.

Conventionally, as means for solving this problem, when hydraulic pressure is used for the drive source, a method of providing a flow rate regulating valve to synchronize the speeds of the drive sources on both sides has been adopted, and an electric motor is used as the drive source. When used, the operation amount (opening amount of the wing) of the wing opening and closing mechanism on both sides is adjusted so that the wings are opened in a twisted state corresponding to the speed difference between the electric motors on both sides, and the wing is closed. Sometimes adjustments were made to return to the normal state and close due to the speed difference of the electric motor.

However, in such conventional means, when the viscosity of the hydraulic oil changes due to a temperature change, or when the friction load of the wing opening / closing mechanism changes due to initial wear or adhesion of dust, the operation of the drive sources on both sides is performed. When the speed changed, the adjustment work for synchronizing the opening and closing of the wing had to be repeated every time, which was troublesome.

Accordingly, an object of the present invention is to provide a synchronization mechanism for preventing wing twist when opening and closing the wing with a simple structure without requiring any special adjustment work.

[0009]

In the apparatus according to the present invention, a transmission shaft 6 which is close to the pivot 4 of the wing 1 and which is parallel to the pivot 4 is freely rotatably supported on the wing 1 side. The movement is fixed and locked to the wing 1 at one end thereof, and a lever 11 extending in the direction perpendicular to the axis is provided at the other end of the transmission shaft 6. 13 is fixed to the wing 1 and is opposed to the wing 1. When the detection sensor 12 or 13 detects the lever 11, the speed of the drive sources 17F and 17B of the wing opening and closing devices provided on both sides of the wing 1 is changed. It was done.

The simplest structure for changing the speed of the drive sources 17F and 17B on both sides is the drive source 17F and 17B on both sides.
Are provided with deceleration circuits 23F and 23B, respectively.
When one of the two detection sensors 12 and 13 detects the lever 11, one of the drive sources 17F and 17B is switched to the deceleration circuit side, and when the other 13 of the detection sensors 12 and 13 detects the lever 11, the drive source This is a structure in which the other of 17F and 17B is switched to the speed reduction circuit side. As the deceleration circuit, a resistance circuit may be used when the driving source is an electric motor, and a throttle circuit may be used when the driving source is a hydraulic motor or a cylinder. Note that the detection sensors 12, 13 and the driving sources 17F,
It should be noted that the correspondence with 7B is reversed.

Although the transmission shaft 6 may be a thin shaft, a structure in which the transmission shaft 6 is inserted through the pipe 5 fixed to the wing 1 is preferable in order to smoothly rotate the transmission shaft 6 while preventing bending due to its own weight. .

[0012]

[Function] Lever 11 attached to one end of transmission shaft 6
Indicates the rotation angle of the other end of the wing 1. When the wing 1 is twisted, the lever 11 is detected by one of the detection sensors 12 and 13 facing the lever 11. It is known which of the drive sources of the wing opening and closing devices on both sides has a higher speed depending on which sensor detects the lever 11, and if the speed of the leading drive source is controlled to be reduced, the wing 1 twists. The wing 1 opens and closes while being corrected at minute intervals, and the torsion of the wing 1 during opening and closing of the wing can be suppressed to a level that does not hinder practical use. In the wing of an ordinary heavy truck, if the deflection of the lever 11 is detected once, the displacement of the tip of the wing due to the torsion of the wing is reduced by two.
It can be suppressed to 0 to 30 mm.

The drive sources 17F and 17B on both sides are provided with deceleration circuits 23F and 23B, respectively.
13, one of the driving sources is decelerated by the speed reduction circuit 23.
The structure of switching between F and 23B is characterized in that the control circuit is simplified and the driving sources 17F and 17B can be operated at the fastest speed.

[0014]

Next, an embodiment shown in FIGS. 1 to 4 will be described. The wing 1 of the carrier body is formed by a panel 2 and a number of ribs 3.
And is pivoted to the center of the roof (not shown). A pipe 5 is provided near the pivot 4 and in a direction parallel to the pivot 4 so as to pass through the ribs 3. A transmission shaft 6 is movably inserted through the pipe 5. Both ends of the transmission shaft 6 protrude from both ends of the pipe 5, and a bracket 8 is fixed to a rear protruding end 7 </ b> B, and the bracket 8 is fixed to a rib 3 </ b> B at the rear end of the vehicle with a bolt 9. On the other hand, a lever 11 extending outward in a direction along the rib 3F at the front end is fixed to the front protruding end 7F of the vehicle, and limit switches 12 and 13 detect the upper and lower positions sandwiching the end of the lever 11 at the upper and lower sides. It is fixed and attached to the rib 3F with its ends facing each other.

The opening / closing device for the wing 1 is mounted on shoulders of a front supporting frame 14F and a rear supporting frame 14B fixed to a bogie (not shown), and is driven by a motor 17 via a worm speed reducer 16. A rack 19 pivoted at one end to a shoulder of the wing 1 is meshed with a pinion 18 driven to rotate, and the rack 19 is moved up and down by forward and reverse rotation of a motor 17 to open and close the wing 1. The wing opening / closing device 20 is provided at two positions, a front end and a rear end of the wing 1, and each is provided with a separate drive motor 17F,
17B.

The drive circuit for the motor 17F on the front side of the wing and the motor 17B on the rear side of the wing includes a regular circuit having relay contacts 21F and 21B and resistors 22F and 22B as shown in FIG.
B are connected in parallel with the speed reduction circuits 23F and 23B, and when the relay contacts 21F and 21B, which are normally closed contacts, are opened, the resistances 22F and 22B are applied to the motors 17F and 17B.
Are connected in series, and the rotation speeds of the motors 17F and 17B are reduced.

FIG. 4 shows an example of a control circuit for controlling the relay contacts 21F and 21B of the motors 17F and 17B, where u is a wing open signal, d is a wing close signal, and 24 and 25 are the limit switches 12 and 13 contacts, 26 to 29 are AND gates, 31 and 32 are OR gates, 34F and 34B are output transistors, RF and RB are the relay contacts 21 respectively.
F, 21B are opening relay coils.

Next, the operation of the above embodiment will be described.
When the opening of the wing 1 is instructed by a push button operation or the like, the motors 17F and 17B start rotating at the same time, and drive the rack 19 in the upward direction to move the wing 1 upward.
Is swung in the opening direction. When the upper limit switch 12 detects the lever 11 during the wing opening operation, the output of the AND gate 28 causes the OR gate 32 to be output by the AND signal of the wing opening signal u and the closing signal of the contact 24 of the upper limit switch 12. As a result, the output transistor 34B is turned on to excite the relay coil RB to open the relay contact 21B of the rear motor 17B. Then, the speed of the rear motor 17B becomes slow, and the ascending speed of the front side of the wing 1 becomes relatively high. As a result, the torsion of the wing is corrected and the lever 11 is separated from the upper limit switch 12 and the relay coil RB. The excitation is released, the relay contact 21B of the rear motor 17B closes, and the motor 17B returns to the normal speed again. When the rotation speed of the rear motor 17B is high, the wing 1 is opened while repeating such an operation.

Conversely, when the speed of the front motor 17F is higher, the front end of the wing 1 rises first, so that the lower limit switch 13 detects the lever 11. Then, the opening command u and the contact 25 of the lower limit switch 13
, The output of the AND gate 27 passes through the OR gate 31 to turn on the output transistor 34F to excite the relay coil RF. Then, the relay contact 21F of the front motor 17F is opened, and the resistor 22F is connected in series to the motor 17F. Therefore, the rotation speed of the front motor 17F decreases, and the front rising speed of the wing 1 decreases. . When the twist of the wing is corrected by this operation, the lever 11 separates from the lower limit switch 13, whereby the excitation of the relay coil RF is released, the relay contact 21F is closed, and the rotation of the front motor 17F is also normal. Return to rotation. When the front motor 17F tends to be fast, the wing 1 is opened while repeating such an operation.

On the other hand, when the wing 1 is closed, when the lever 11 is detected by the upper limit switch 12 while the wing 1 is being lowered while the closing command d is being output, the closing command d and the upper limit By the AND signal with the closing signal of the contact 24 of the switch 12,
The output of the AND gate 26 passes through the OR gate 31 to turn on the output transistor 34F, and energizes the relay coil RF to open the relay contact 21F of the front motor 17F. Then, since the rotation speed of the front motor 17F decreases and the lowering speed of the front end side of the wing 1 decreases, the lever 11 separates from the upper limit switch 12, and the rotation speed of the front motor 17F returns to the normal speed again.

Conversely, when the lever 11 is detected by the lower limit switch 13 while the wing 1 is being lowered, the lowering command d and the contact 25 of the lower limit switch 13 are detected.
The output of the AND gate 29 passes through the OR gate 32 to turn on the output transistor 34B, and the relay coil RB is excited by the AND signal with the closing signal of the rear motor 17.
The relay contact 21B of B is opened, whereby the lowering speed of the rear end of the wing 1 is reduced and the lowering speed of the rear side of the wing 1 is reduced, whereby the imbalance of the lowering speed is corrected and the lever 11 is limited. When the switch 13 is separated, the relay contact 21B is closed and the rear motor 1 is closed.
7B is returned to the normal state.

In this manner, during the opening and closing operations of the wing 1, the speed difference between the motor 17F on the front end side and the motor 17B on the rear end side of the wing causes the front end angle and the rear end angle of the wing to change. When there is an angle difference, the speed of the drive source on either side is reduced and the wing 1 is opened and closed while correcting the angle difference, that is, the twist of the wing 1, so that the wing 1 is not twisted. It will be opened and closed.

[0023]

According to the apparatus of the present invention described above,
In a wing type van body truck that drives the wing opening and closing devices provided before and after the loading platform with separate drive sources, the lifting speed before and after the wing can be synchronized with a simple structure. There is an effect that it is possible to provide a van body truck that is simple and easy to mount the van body, and that does not require the work of adjusting the twist of the wing when opening and closing the wing.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a wing of an embodiment.

FIG. 2 is a sectional view of a wing opening / closing device.

FIG. 3 is a diagram showing an example of a speed reduction circuit connected to a drive source.

FIG. 4 illustrates an example of a control circuit.

FIG. 5 is a schematic side view of a truck showing a twisted state of a wing.

FIG. 6 is a schematic perspective view of a truck bed having a wing-shaped bamboo body.

[Explanation of symbols]

 1 Wing 4 Axis 5 Pipe 6 Transmission shaft 11 Lever 12 Limit switch 13 Limit switch 14 Support frame 17 (F, B) Electric motor 23 (F, B) Reduction circuit 42 Tilt 43 Edge of wing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05F 15/00-15/20 B60J 7/08

Claims (2)

(57) [Claims] 1. A pivot in proximity to a pivot (4) of a wing (1).
A transmission shaft (6) parallel to (4) is rotatably supported on the wing (1) side, and the rotation of the transmission shaft is fixed and locked to the wing (1) at one end. , Transmission shaft
At the other end of (6), a lever (11) extending in a direction perpendicular to the axis is provided, and two detection sensors (12), (1) are sandwiched by the lever (11).
When the detection sensor (12) or (13) detects the lever (11), the wing opening and closing device provided on both sides of the wing (1) is driven when the detection sensor (12) or (13) detects the lever (11). Source (1
A wing opening / closing synchronization device for van body trucks, characterized by varying the speed of (7F) and (17B). 2. A deceleration circuit (23F), (23B) is provided for each of the drive sources (17F), (17B) on both sides, and one (12) of the two detection sensors (12), (13) is When one of the drive sources (17F) and (17B) is switched to the deceleration circuit side when the lever (11) is detected, and the other (13) of the detection sensors (12) and (13) detects the lever (11). 2. The wing opening / closing synchronization device for a van body truck according to claim 1, wherein the other of the drive sources (17F) and (17B) is switched to the speed reduction circuit side.