JP2000291699A - Emergency stop brake device and forklift using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency stop brake device capable of being automatically operated in the abnormality of an electric system. SOLUTION: This device comprises a disc brake 20 for applying the braking to a motor, a spring 64 for applying the energization force for bringing this disc brake 20 into an operating state, and the rotary solenoids 51, 52 for applying the driving force for bringing the disc brake 20 into an opened state. In a normal condition, the rotary solenoids 51, 52 are driven to open the disc brake 20 against the energization force by the spring 64, and the rotary solenoids 51, 52 are switched off in the generation of the abnormality in an electric system for operating the disc brake 20 by the energization force of the spring 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop brake device, and more particularly to an emergency stop brake device for automatically operating a disk brake to stop a rotating body when a failure occurs in an electric system. . The present invention also relates to a forklift equipped with such an emergency stop brake device.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a schematic configuration of a reach type forklift. In the figure, 1 is a fork for holding luggage, 2 is a mast for raising and lowering the fork 1, 3 is a handle for operating the traveling direction of the vehicle body 100, 4
Is a lever for raising and lowering the fork 1 and tilting forward and backward, 5 is a body frame of a vehicle body 100 on which a traveling motor 15 and a brake device 16 for braking the motor 15 are mounted, and 6 is a body frame. Front wheel of body 100, 7
Is a rear wheel of the vehicle body 100, 8 is a driver's seat, 9 is a head guard for protecting the driver from falling objects, 10 is a seat provided in the driver's seat 8, and 11 is an operation lever for parking brake.

In the above-described forklift, a brake device 16 is operated by an operation of an operator (driver). For example, when the operator manually operates the operation lever 11 for the parking brake, the operation force is transmitted to the brake device 16 via a wire, the brake device 16 is actuated, and the motor 15 is braked. When a foot brake pedal (not shown) is operated with a foot, the operation force is transmitted to the brake device 16 via a hydraulic system, and the brake device 16 is operated to operate the motor 1.
5, the vehicle body 100 stops.

[0004]

In the case where the forklift is a forklift having an all-electric power steering system, when an abnormality occurs in the electric system of the vehicle body 100, power is supplied from a battery for safety. It is necessary to cut off the vehicle body 100 automatically. However, in the conventional device, since the brake device 16 is operated only by the operation of the operator, the brake device 16 cannot be operated unless the operator operates a lever, a pedal, or the like. For this reason, it was not possible to automatically stop the forklift by operating the brake device 16 in an emergency.

An object of the present invention is to provide an emergency stop brake device capable of automatically operating a brake device when an abnormality occurs in an electric system. It is an issue. It is another object of the present invention to provide a forklift capable of automatically stopping when an abnormality occurs in an electric system.

[0006]

In order to solve the above-mentioned problems, an emergency stop brake device according to the present invention includes a disc brake for applying a brake to a rotating body such as a motor, and an operating state of the disc brake. And a driving means such as a rotary solenoid for applying a driving force for releasing the disc brake. In a normal state, the drive means is driven to release the disc brake against the urging force of the urging means. In an emergency, the drive means is stopped and the disc is released by the urging force of the urging means. The brakes are activated.

Here, the disc brake is composed of a disc attached to the rotating shaft of a rotating body and a caliper that clamps the disc to apply a brake. The opening / closing mechanism of the caliper is used as a transmission mechanism and a link mechanism. In addition to the connection with the driving means through the transmission mechanism, a configuration in which the urging means is connected with the transmission mechanism can be adopted. As the disc brake, one having both functions of a foot brake and a parking brake can be used.

According to the present invention, when an abnormality occurs in the electric system, the driving means stops and there is no driving force for releasing the disk brake. Therefore, the disk brake is automatically activated by the urging force of the urging means. Activated.
Further, by using a disc brake having both functions of a foot brake and a parking brake, the existing disc brake can be used as it is for an emergency brake device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the emergency brake stop device according to the present invention, FIG. 2 is a side view taken along the line AA in FIG. 1, and FIGS. 3 and 4 are side views taken along the line BB in FIG. Note that the overall configuration of the reach type forklift using the emergency brake stop device is the same as that of FIG. 7, and therefore the description thereof is omitted, and the following description will be made with reference to the reference numerals in FIG.

In FIGS. 1 and 2, reference numeral 15 denotes a traveling motor shown in FIG. 7, and reference numeral 20 denotes a disc brake for applying a brake to the motor 15. The disc brake 20 includes a disc 21 and a caliper 22. The disc 21 is attached to a rotating shaft 24 of a motor 15 which is a rotating body.
It rotates with 4. Caliper 22
Are provided with an upper caliper 22a and a lower caliper 22b, and holding members 27 and 28 for holding the disc 21 from above and below at the respective leading ends, and when the brake is operated, these holding members 27 and 28 are provided. , 28 is disk 2
1, the rotation of the disk 21 is braked by the frictional force, and the motor 15 is stopped.

An intermediate portion of the caliper 22 is supported by a shaft 26, and the upper caliper 22 is
The holding members 27 and 28 come into contact with or separate from the disk 21 by rotating the a and the lower caliper 22b (see FIGS. 5 and 6 described later). A shaft 33 is provided at a rear end of the upper caliper 22a, and a shaft 34 is provided at a rear end of the lower caliper 22b. A spring 35, which is an elastic member, is provided between the shafts 33 and 34. Is suspended.

The shaft 33 supports one end of a lever 31, and the other end of the lever 31 is engaged with the shaft 30. An intermediate portion of an L-shaped lever 32 is supported on the shaft 34, and one end of the lever 32 is engaged with the shaft 30, and a shaft 36 is provided on the other end. These lever 31, lever 32, shaft 30, shaft 3
3, the shaft 34 and the shaft 36 constitute an opening / closing mechanism 29 composed of a toggle mechanism.

Numeral 38 designates a joint formed in a rectangular shape, and this joint 38 has an elongated hole 37 as shown in FIG.
The shaft 36 described above is inserted through the elongated hole 37. The tip of a parking brake wire 42 is engaged with the shaft 36 (not shown in FIG. 2), and the shaft 36 moves in the elongated hole 37 in conjunction with the operation of the parking brake. . In FIG. 2, reference numeral 39 denotes a bolt for fixing the caliper 22 to the motor 15, reference numeral 40 denotes a spacer, and reference numeral 41 denotes a hydraulic cylinder for a foot brake described later. In FIG. 1, reference numeral 43 denotes a hydraulic tube for a foot brake.

Next, in FIGS. 1 and 3, reference numerals 51 and 52 denote rotary solenoids attached to a plate 75, which constitute one embodiment of the driving means in the present invention. FIG. 3 shows the rotary solenoids 51 and 5.
2 shows a state when it is not operating. The rotary solenoid 51 has an arm 54 connected to a pin 7
6 and a rotary solenoid 5
2 has an arm 56 attached to its rotating shaft 55 by a pin 77. Then, the two arms 54, 5
6 are connected by a link mechanism 57,
6 is further connected to a transmission mechanism 63 by a link mechanism 58.

As shown in FIG. 3, a link rod 66 attached to the arm 54 with a rod end 65 and a link rod 68 attached to the arm 56 with a rod end 69, as shown in FIG. It is configured. Further, the link mechanism 58 is configured such that a link rod 71 attached to the arm 56 by a rod end 70 and a link rod 73 attached to the lever 60 of the transmission mechanism section 63 by a rod end 74 by a turnbuckle 72. ing.

The transmission mechanism 63 is provided with the lever 60 described above.
And a lever 6 connected to the lever 60 by a shaft 59.
2 and a shaft 6 connecting this lever 62 to the joint 38.
And link mechanisms 57, 58 driven by the rotary solenoids 51, 52.
Is transmitted to the caliper 22.

A spring 64 is an elastic member.
It constitutes one embodiment of the urging means in the present invention. The upper end of the spring 64 is connected to the shaft 6 of the transmission mechanism 63.
1 and a lower end portion is locked by a hook 80 fixed to a mounting piece 79 of a mounting bracket 78,
The shaft 61 is given a downward biasing force in FIG. 3 by the spring 64.

Next, the operation of the emergency stop brake device configured as described above will be described. The emergency stop brake device described above is mounted on the forklift of FIG. 7 and is used as the brake device 16 in FIG. During normal operation of the forklift, power is supplied to the rotary solenoids 51 and 52 from the battery, and these solenoids 51 and 52 are in an operating state. FIG. 4 shows this state. In FIG. 4, the solenoid 51
The rotation of the rotating shaft 53 in the counterclockwise direction is performed by the above operation, and accordingly, the arm 54 is displaced to the left. Also,
By the operation of the solenoid 52, the rotation shaft 55 also rotates counterclockwise, and the arm 56 is displaced to the left.

The arm 54 and the arm 56 are connected to the link mechanism 5
7, the link mechanism 58 is pulled leftward in FIG. 4 by the displacement of the arms 54 and 56. For this reason, the lever 60 connected to the link mechanism 58
Receives the turning force in the counterclockwise direction about the shaft 59 and, together with this, the lever 6 connected to the lever 60.
2 also receives a turning force in the counterclockwise direction about the shaft 59. As a result, the shaft 61 connecting the lever 62 and the joint 38 moves upward against the downward urging force of the spring 64, and the joint 38 also moves upward integrally with the shaft 61. .

In this state, the shaft 36 is located at the upper end of the elongated hole 37 of the joint 38 in FIG. 2, and the force of the joint 38 does not act on the shaft 36. On the other hand, a biasing force of a spring 35 is acting on the shafts 33 and 34, and the upper caliper 2 is
A clockwise rotation around the shaft 26 acts on 2a, and a counterclockwise rotation around the shaft 26 acts on the lower caliper 22b by the upward biasing force received by the shaft 34. As a result, the tip of the caliper 22 is opened as shown in FIG. 5 to separate the clamping members 27 and 28 from the disk 21 (FIG. 5 is a schematic diagram and is exaggerated). Accordingly, the disc brake 20 does not operate in the normal state, and the motor 15 is not braked, so that the running of the forklift is not hindered.

On the other hand, in an emergency, that is, when an abnormality occurs in the electric system of the vehicle body, the power supply from the battery is cut off as described above, and the solenoids 51 and 52 are turned off. FIG. 3 shows this state. When the solenoids 51 and 52 are turned off, there is no force against the downward biasing force of the spring 64, and the shaft 61 is pulled by the spring 64 and moves downward from the position of FIG. 4 to the position of FIG. Therefore, the lever 60 and the lever 62 connected to the shaft 61 rotate clockwise about the shaft 59, and move the link mechanism 58 rightward from the position in FIG. 4 to the position in FIG. Movement of the link mechanism 58 to the right also displaces the arms 54 and 56 from the position in FIG. 4 to the position in FIG.

In this state, the joint 38 connected to the shaft 61 also moves downward together with the shaft 61.
In FIG. 2, the shaft 36 is pushed down by the upper end of the long hole 37 of the joint 38 and descends downward. When the shaft 36 is lowered,
Since the lever 32 rotates clockwise about the shaft 34, the shaft 33, 34 is displaced in the vertical direction against the pulling force of the spring 35 by the force of the shaft 30 displacing rightward. That is, the shaft 33 is displaced upward via the lever 31, and the shaft 34 is displaced downward via the lever 32. Therefore, the upper caliper 22a is
, And the lower caliper 22 b receives a clockwise rotation about the shaft 26. As a result, the tip of the caliper 22 closes as shown in FIG. 6, and the holding members 27 and 28 hold the disk 21 to apply braking to the rotation of the motor 15 (see FIG. 6).
Is a schematic diagram and is exaggerated).

In this way, when an emergency occurs in the electric system of the forklift, the rotary solenoid 5
1 and 52 are turned off so that the disc brake 2
0 operates and the motor 15 is braked, so that the forklift having the all-electric power steering system can be automatically stopped.

When the operating lever 11 is operated by the operator, the parking brake wire 42 causes the shaft 36 to rotate.
Is pulled downward in FIG. 2, and the shaft 36 moves downward along the elongated hole 37 of the joint 38. In this case, the joint 38 does not move. When the shaft 36 is lowered, the lever 32 rotates clockwise about the shaft 34 in the same manner as in the above-described emergency, and the shafts 33 and 34 are vertically moved against the pulling force of the spring 35. Because it is displaced, caliper 22
6 is closed as shown in FIG. 6 to operate the brake.

When an operator operates a foot pedal (not shown) with a foot, a hydraulic cylinder 41 (FIG. 2) operates via a hydraulic tube 43 for foot brake (FIG. 1). 30 is pushed rightward. Therefore, based on the same principle as described above, the shafts 33 and 34 are vertically displaced against the tensile force of the spring 35, and the tip of the caliper 22 is closed as shown in FIG.

As described above, in the present embodiment, the disc brake 20 is a disc brake for a foot brake and a parking brake originally provided in a forklift, and also serves as an emergency stop brake. Then, the transmission mechanism 63 is connected to the existing brake opening / closing mechanism 29, and the rotary solenoids 51 and 52 and the link mechanisms 57 and 58 are connected.
Is added, so that it can be easily realized without changing the structure of the disc brake itself.
Also, by not modifying the existing brake, the performance and operational feeling of the foot brake and the parking brake are not impaired.

Further, in the present embodiment, 2
Two rotary solenoids 51, 5 arranged side by side
2 and the use of the link mechanisms 57 and 58, the driving force can be ensured, the structure can be simplified and the whole can be made compact, and the attachment to the existing brake becomes easy. Further, by adjusting the spring force of the spring 64, the pinching force of the caliper 22 can be varied, and an appropriate braking force can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, but may adopt various other forms. For example, in the above embodiment, two rotary solenoids are provided as drive means, but one rotary solenoid may be provided. Further, it is also possible to use a linear solenoid instead of the rotary solenoid. Further, various types of disc brakes other than those described above can be used. Further, the emergency stop brake device according to the present invention can be applied to vehicles other than forklifts.

[0029]

According to the emergency stop brake device of the present invention, when an abnormality occurs in the electric system, the operation of the driving means is stopped and the disc brake is operated by the urging force of the urging means. In an emergency, the brake can be automatically applied to apply braking to the rotating body.
In addition, by using a disc brake having both functions of a foot brake and a parking brake, an emergency stop brake can be configured by simply adding a driving unit and an urging unit to an existing disc brake.

According to the forklift of the present invention,
By mounting the emergency stop brake device described above and a traveling motor that is braked by the emergency stop brake device, the motor is automatically braked when an abnormality occurs in the electric system. A forklift with a steering system can be stopped automatically.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an emergency brake stop device according to the present invention.

FIG. 2 is an AA side view of FIG. 1;

FIG. 3 is a BB plan view of FIG. 1 in a brake operating state.

FIG. 4 is a BB plan view of FIG. 1 in a brake released state.

FIG. 5 is a schematic diagram (brake released state) for explaining the operation of the brake.

FIG. 6 is a schematic diagram (brake operation state) illustrating the operation of the brake.

FIG. 7 is a perspective view showing a schematic configuration of a reach type forklift.

[Explanation of symbols]

 15 Motor 20 Disc Brake 21 Disc 22 Caliper 24 Rotary Shaft 29 Opening / Closing Mechanism 51 Rotary Solenoid (Drive Means) 52 Rotary Solenoid (Drive Means) 57 Link Mechanism 58 Link Mechanism 63 Transmission Mechanism 64 Spring (biasing Means)

Claims (5)

[Claims] 1. A disc brake for applying a brake to a rotating body, an urging means for applying an urging force for bringing the disc brake into an operating state, and a driving force for bringing the disc brake into an open state. A driving means, in a normal state, driving the driving means to release the disc brake against the urging force of the urging means, and in an emergency, stopping the driving means to stop the disc brake. An emergency stop brake device, wherein the disc brake is actuated by an urging force of an urging means. 2. A disc brake comprising: a disc mounted on a rotating shaft of a rotating body; and a caliper for sandwiching the disc to apply a brake. The opening / closing mechanism of the caliper is connected via a transmission mechanism and a link mechanism. The emergency stop brake device according to claim 1, wherein the urging means is connected to the driving mechanism, and the urging means is connected to the transmission mechanism. 3. The emergency stop brake device according to claim 2, wherein the urging means is a spring, and the driving means is a rotary solenoid. 4. The emergency stop brake device according to claim 1, wherein the disc brake has both functions of a foot brake and a parking brake. 5. A forklift equipped with the emergency stop brake device according to claim 1, and a traveling motor to be braked by the emergency stop brake device.