JPH1163126A - Tensile force adjusting device for driving force transmitting belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tensile force adjusting device for a driving force transmitting belt which does not require artificial inspecting/adjusting work by automatically applying tensile force to the belt. SOLUTION: A tensile force adjusting device of a driving force transmitting belt has a belt looseness detecting means 24 to detect looseness of a belt 5 to transmit power to a pump 3 from a motor 1 and a motor stand driving means 20 to drive a motor stand 25 in the direction for applying tensile force to the belt 5 on the basis of a belt looseness detecting signal from this belt looseness detecting means 24, and the motor stand 25 is moved in the direction for applying tensile force to the belt 5 on the basis of the belt looseness detecting signal from the belt looseness detecting means 24, and tensile force of the belt is automatically adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjusting device for adjusting a tension of a belt for transmitting a driving force of a motor to driven equipment, for example, a pump, various machine tools and the like.

[0002]

2. Description of the Related Art FIG. 7 is a schematic configuration diagram of a conventional hydraulic elevator apparatus using a pump as driven equipment. In the figure, 1 is a motor, 2 is a pulley attached to a motor shaft 38, 3 is a pump, 4 is a pulley attached to a pump shaft 39,
Reference numeral 5 denotes a belt suspended between the pulley 2 and the pulley 4, and the rotational force of the motor 1 is transmitted to the pump 3 via the belt 5. 6 is an oil pipeline 9 connecting the pump 3 and the oil tank 7
b, a control valve 9b, an oil suction pipe connecting the pump 3 and the oil tank 7 directly, 9c an oil pipe connecting the control valve 6 and the silling 11, 10 a motor controller, 1
Reference numeral 2 denotes a plunger, and reference numeral 13 denotes a car attached to an end face of the plunger 12 protruding from the cylinder 11. The above motor 1
Is attached to the motor base 14a by bolts 15a,
The pump 3 is fixed to the mounting base 14 by bolts 16, and the motor 1 and the pump 3 are linked via a belt 5 having a predetermined tension, so that the torque of the motor 1 is transmitted to the pump 3 by the belt 5. It is configured.

Next, the operation will be described.

When the motor 1 rotates according to a command from the motor control unit 10, a rotational force is transmitted to the pump 3 via the belt 5. The pump 3 is operated by the transmitted rotational force, sucks the oil 8 in the oil tank 7 from the oil suction pipe 9a, and transfers the oil 8 to the cylinder 11 via the oil pipe 9b-control valve 6-oil pipe 9c. Send to

The sent oil 8 acts on the plunger bottom 12a of the plunger 12 to push the plunger 12 and move the car 13 attached to the plunger 12 in the direction of the arrow. In this case, when the belt 5 is loosened and the rotational force of the motor 1 is not smoothly transmitted to the pump 3, the adjusting bolt 17 is turned while the bolt 15b is loosened, so that the motor base 14a is moved along the upper surface of the mounting base 14. Is moved in the direction of the arrow to eliminate the slack of the belt 5 and adjust the belt tension.

[0006]

However, since the belt 5 has elasticity due to its material and extends due to rotational fatigue and lapse of time, when the belt 5 is extended, the tension of the belt is loosened.
The torque of the motor 1 is not transmitted to the pump 3 stably. Therefore, it is necessary for an operator to periodically check and adjust the belt tension to apply a predetermined tension to the belt.

Therefore, in order to adjust the tension of the belt 5, the bolts 15 attached to the motor base 14 a
b, loosen the adjustment bolt 17 and remove the belt 5
After setting the tension to a predetermined value, the motor base 14a is fixed to the mounting base 14 by tightening the bolt 15b.

In this case, when the bolt 15b is loosened, the pulley 2 on the motor side is pulled toward the pump 3 by the tension of the belt 5, and the pulley center position 36 and the virtual position 37 shown in FIG.
Shifts in the distance of For this reason, it is necessary to adjust the tension of the belt 5 while correcting the shift amount, and there is a problem that the workability is poor, and the operation of adjusting the tension of the belt 5 takes a long time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and automatically imparts tension to a belt, thereby eliminating the need for manual inspection and adjustment work. The aim is to obtain an adjusting device.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a rail which slidably supports a motor base on which a motor is mounted, and which is driven by the motor via a belt together with the rail. A belt for detecting looseness of the belt, which is activated when a belt suspended between a pulley mounted on the motor shaft and a pulley mounted on the driven device shaft loosely comes into contact with a mounting base on which the driven device is mounted. Slack detecting means, and motor stand driving means for driving the motor base in a direction for applying tension to the belt based on a belt slack detection signal from the belt slack detecting means, wherein the belt is slackened, When a belt slack detection signal is output from the belt slack detecting means, the motor base driving means applies tension to the belt by using the motor base based on the belt loose detection signal. It is moved to the direction, in which it is possible to automatically adjust the tension of the belt.

Further, the driven equipment may be a pump that operates by receiving a driving force from a motor and controls the movement of the car of the hydraulic elevator apparatus based on a discharge amount.

[0012] The motor base driving means may include a solenoid valve that operates in response to a control signal from a control unit based on a belt slack detection signal, and an oil source via a hydraulic line opened by the solenoid valve. And a plunger that drives the motor base in a direction that applies tension to the belt with an end face protruding from the cylinder.

[0013] The hydraulic source may be a pump that operates by receiving a driving force from a motor and controls the movement of the car of the hydraulic elevator apparatus by the discharge amount.

A wedge provided on a portion of the motor base sliding along the rail opposite the rail; and a wedge holding spring for urging the wedge in a direction for fixing the motor base against tension of a belt. It is provided with.

[0015] The belt slack detecting means may be a switch which is activated by a contact when the belt is slack.

[0016]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an external perspective view of a motor and a pump mounting portion showing a motor driven hydraulic elevator apparatus having a driving force transmission belt tension adjusting device according to an embodiment of the present invention, and FIG. 2 is an overall configuration. FIG.
1 is a motor, 2 is a pulley attached to a motor shaft 38, 3 is a pump, 4 is a pulley attached to a pump shaft 39, 5 is a belt suspended on the pulleys 2 and 4, 6 is a control valve, 7 is an oil tank, 8 is oil, 9a is an oil suction line, 9b and 9c are oil lines, 10 is a motor control unit, 11 is a cylinder, 12 is a plunger, 13 is a car, and 14 is a mounting stand, which are shown in FIG. Since the configuration is the same as that of the conventional example, the same portions are denoted by the same reference numerals, and redundant description will be omitted. 15c is a bolt for fixing the motor 1 on the sliding motor base 25, 18 is a control unit for inputting a belt tension confirmation signal from a switch 24 as a belt tension confirmation member, and 19 is a motor base driving device 2.
0, a control unit for controlling the motor base drive cylinder, 2
Reference numeral 3 denotes a motor base drive plunger, 24a denotes a roller of a switch 24 for detecting a change in the tension of the belt 5 by contact with the belt 5, and 26 denotes a rail that supports the motor base 25 and guides the belt 5 in the direction of applying tension. , And are attached to the mounting base 14 with bolts 26a. 27 is a wheel attached to the motor base 25, 28 is a wedge provided so as to sandwich the rail 26, and 29 is a wedge holding spring.

The motor base 25 has a structure which can slide on the mounting base 14 with wheels 27 over a rail 26.
The pump 3 is fixed to a mounting base 14 by bolts 16, and a motor base driving device 20 is mounted on the motor 1 side of the pump 3. The plunger 23 of the motor stand drive cylinder 21 is configured to push both ends of the motor stand 25.
When the belt 5 comes into contact with the switch roller 24a, the belt slack detection means 24 outputs a belt slack detection signal to the controller 18. A control signal is sent from the control unit 18 to the control unit 19 and the control unit 10 based on the reception of the belt slack detection signal.

When the control unit 19 receives a control signal from the control unit 18, the control unit 19 operates the motor drive unit 20. Control unit 10
Outputs a rotation command to the motor 1.

FIG. 3 is a plan view of the motor base 25 viewed from above with a part thereof cut away. A recess 25a is formed in the rail-facing surface of the motor base 25, and a wedge 28 and a wedge holding spring 29 are provided in the recess 25a. The wedge 28 is fixed in the direction in which the motor base 25 is always fixed by the wedge holding spring 29. Being pressed. That is, the wedge 28 is the rail 2
6 acts parallel to the rail so as to sandwich the rail.

FIGS. 4 and 5 are cross-sectional views of the motor base drive unit 20. The electromagnet 31 is excited and demagnetized by a control signal from the control unit 19. The oil stopper plunger 30 moves in the motor base drive device 20 in the axial direction by the attraction force of the electromagnet 31 and the spring pressure of the plunger pressing spring 32. The side of the oil stopper plunger 30 opposite to the plunger presser spring 32 is
The oil path 33 can be opened (FIG. 4) and closed (FIG. 5). Oil path 3
Reference numeral 3 denotes an oil passage for sending oil from the oil pipeline 22 to the motor stand drive cylinders 21 on both sides.

Next, the operation will be described.

The belt 5 is extended and the belt confirmation switch 24
When the belt 5 comes into contact with the switch roller 24a, a belt looseness detection signal is output to the control unit 18. Based on this, the control unit 18 sends a control signal to the control unit 10 and the control unit 19. Since the control unit 10 issues a rotation command for the motor 1, the motor 1 rotates.

On the other hand, the control unit 19 controls the motor base driving device 2
In order to issue a drive command to 0, the electromagnet 31 in the motor base drive device 20 is excited and the oil stop plunger 30 is attracted.
At that time, the plunger presser spring 32 is in a contracted state. Then, the oil path 33 is opened, and the oil path on the pump side 34 and the oil path on the motor base drive side 35 are communicated.

The torque of the motor 1 is transmitted to the pump 3 via the belt 5 to operate the pump. The oil 8 in the oil tank 7 is sent to the motor stand drive device 20 through the oil pipe line 22 by the pump pressure of the pump 3 that has been operated. The oil 8 is sent to the motor stand drive cylinder 21 through the oil path 33.

The motor base drive plunger 23 in the motor base drive cylinder 21 uses the supplied hydraulic pressure to
Press both ends of. In this case, the motor base 25 is a wedge 28
When receiving a pressing force stronger than the holding force, the motor base 25 is guided by the rail 26 toward the side opposite to the pump 3 and moves on the mounting base 14 via the wheels 27,
A tension is applied to the belt 5.

By applying tension to the belt 5,
The belt 5 is released from contact with the switch roller 24a, and the belt slack detection signal to the controller 18 is cut off. At the same time, the control signals to the control unit 10 and the control unit 19 are also cut off. Therefore, the motor 1 stops when the signal from the control unit 10 is cut off. Further, in the motor stand driving device 20, the electromagnet 31 is demagnetized by the interruption of the control signal from the control unit 19, and the oil stop plunger 30 is pressed by the spring pressure of the plunger presser spring 32 to close the oil path 33.

As a result, the motor base drive plunger 23
Means that there is no pressure to press the motor base 25,
At the moved position is fixed to the rail 26 by a wedge 28 pressed by a wedge holding spring 29. At this time, the motor base 25 is fixed to the side surface of the rail 26 that is parallel to the left and right, so that the pulley core position 36 and the virtual position 37 shown in FIG. 6 are automatically kept parallel. Therefore, the center of the pulley attached to the motor shaft and the center of the pulley attached to the pump shaft do not shift, and the tension adjustment of the belt is performed with high accuracy.

[0029]

As described above, according to the present invention, belt slack is detected by the belt slack detecting means, and the motor base is moved by the driving device based on the belt detection signal to apply an appropriate tension to the belt. Since the configuration is such that the belt tension is given, it is not necessary to inspect and adjust the belt tension artificially and periodically.

Further, since the motor base is moved by using a driving device which is movable by the oil discharge amount of the elevator control pump, a special power device for adjusting the belt tension is not required.

Further, since the wedge fixing method of fixing the motor base by wedges is employed, the operation of adjusting the belt tension can be performed smoothly.

Further, since the belt looseness detecting means is constituted by a switch which is activated by the contact of the belt, it is possible to accurately detect a change in the tension of the belt with an extremely simple structure.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a motor and pump mounting portion showing a motor driven hydraulic elevator apparatus provided with a driving force transmission belt tension adjusting device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a motor-driven hydraulic elevator apparatus including a driving force transmission belt tension adjusting device according to an embodiment of the present invention.

FIG. 3 is a plan view in which a part of a motor base is cut away.

FIG. 4 is a longitudinal sectional view of the motor stand drive device in a state where an oil path is opened.

FIG. 5 is a vertical cross-sectional view of a state in which an oil path of the motor stand driving device is closed.

FIG. 6 is a plan view of a pulley and a belt portion.

FIG. 7 is a configuration diagram of a conventional hydraulic elevator apparatus for driving a motor.

[Explanation of symbols]

1 motor, 2, 4 pulleys, 3 pumps, 5 belts, 14 mounting bases, 20 motor base driving means, 21 cylinders, 23 plungers, 24 switches (belt looseness detecting means), 25 motor bases, 26 rails, 28 wedges, 29 Presser spring, 31 electromagnet, 38 motor shaft, 39 pump shaft.

Claims (6)

[Claims] 1. A rail for slidably supporting a motor base on which a motor is mounted, a mounting base on which a driven device driven by the motor is mounted via a belt together with the rail, and a mounting base mounted on the motor shaft. Belt slack detecting means for detecting slack of a belt suspended on a pulley and a pulley attached to the driven device shaft; and tensioning the motor base to the belt based on a belt slack detecting signal from the belt slack detecting means. And a motor base driving means for driving the belt in a direction to provide the driving force. 2. The pump according to claim 1, wherein the driven device is a pump that operates by receiving a driving force from a motor and controls the movement of the car of the hydraulic elevator device based on a discharge amount.
A tension adjusting device for a driving force transmitting belt according to the above. 3. The motor base driving means includes: an electromagnetic valve that operates in response to a control signal from a control unit based on a belt looseness detection signal; and an oil source through an oil line opened by the electromagnetic valve. 2. A tension adjusting device for a driving force transmitting belt according to claim 1, further comprising: a cylinder receiving the supply of said power, and a plunger for driving said motor base in a direction for applying tension to said belt with an end face protruding from said cylinder. apparatus. 4. The tension adjusting device for a driving force transmission belt according to claim 3, wherein the hydraulic pressure source is the pump according to claim 2. 5. A wedge provided at a portion of the motor base facing the rail, and a wedge presser spring for urging the wedge in a direction for fixing the motor base against tension of the belt. The tension adjusting device for a driving force transmission belt according to claim 1, wherein: 6. The driving force transmitting belt tension adjusting device according to claim 1, wherein the belt slack detecting means is a switch that is activated by a contact when the belt is slackened.