JP3985612B2 - Forced release method and forced release mechanism for braking OFF position in eddy current type speed reducer and eddy current type speed reducer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forcibly releasing a brake OFF position in an ON-OFF switching device of an eddy current type speed reducer attached to a large vehicle such as a bus or a truck as a braking auxiliary device, and a forced releasing mechanism for carrying out this method. In addition, the present invention relates to an eddy current type speed reducer provided with this forced release mechanism.
[0002]
[Prior art]
In recent years, the bus has been designed to reduce the braking stop distance as well as to reduce the braking stop distance as well as to reduce the number of times the foot brake is used during long downhill slopes and to prevent abnormal lining wear and fade. In recent years, eddy current type speed reducers that have been installed on large vehicles such as trucks and trucks in addition to the foot brake as the main brake and the exhaust brake as the auxiliary brake are permanent magnets that do not require energization during braking. There are a lot more things to use.
[0003]
Examples of the permanent magnet type eddy current type speed reducer include the following methods.
(1) For example, as shown in FIG. 5, on the inner peripheral surface side of the drum-like rotor 2 attached to the rotating shaft 1, the nonmagnetic support members 3 are arranged with a predetermined interval in the circumferential direction. A ferromagnetic support ring in which a group of permanent magnets 5 in which N poles and S poles are alternately arranged in the circumferential direction at the same interval as the switch plate 4 is attached to the outer peripheral surface thereof via a group of ferromagnetic switch plates 4. A shaft slide system in which the support ring 6 is provided so that the inside of the case 8 can be moved back and forth by the actuator 7 from the position where the permanent magnet 5 group completely faces the switch plate 4 group to the position where the permanent magnet 5 group is completely separated.
[0004]
(2) For example, as shown in FIG. 6, a support ring 6 disposed on the inner peripheral surface of the rotor 2 so as to face the rotor ring 4 overlaps with the switch plate 4 and the permanent magnet 5 attached to the outer peripheral surface of the support ring 6. And a position where one permanent magnet 5 straddles the adjacent switch plate 4 and a position where the permanent magnet 5 overlaps half by half so as to be able to be selected.
[0005]
(3) For example, as shown in FIG. 7, two support rings having permanent magnet groups in which N poles and S poles are alternately arranged at predetermined intervals along the circumferential direction are arranged in parallel on the outer circumferential surface, The support ring is fixed (hereinafter referred to as “fixed support ring 6a”), and the other support ring is configured to be rotatable by a predetermined angle (hereinafter referred to as “movable support ring 6b”). The position of the permanent magnet 5a of the fixed support ring 6a adjacent to the permanent magnet 5b of the movable support ring 6b and the permanent magnet 5a of the adjacent movable support ring 6b and the permanent magnet 5a of the fixed support ring 6a by the pivoting movement are the same. A double-row swivel system that allows the user to select the position where the poles are different.
[0006]
In such a permanent magnet type eddy current reduction device, the advance / retreat mechanism and the rotation mechanism of the support ring 6 or the rotation mechanism of the movable support ring 6b can be directly used in the axial slide system, In the single-row and double-row swivel methods, there are various types such as those connected to actuators such as hydraulic cylinders, air cylinders, and electric motors via yoke links 9 protruding from the side surfaces of the support ring 6 and the movable support ring 6b. In trucks, buses, and the like that have a compressed air source, an air cylinder drive advance / retract mechanism and a rotating mechanism using the compressed air are often used.
[0007]
[Problems to be solved by the invention]
By the way, since the force required for the above-described driving requires a force larger than the magnetic attractive force generated by the magnetic circuit composed of the rotor and the stator, an air tank and an air supply device of an amount corresponding to the force are provided. However, when the rotational speed of the rotor 2 and the required operating pressure have a relationship as shown in FIG. 8, for example, a functional defect of the air system occurs in the braking ON (operation ON) state, and the single row swivel type (solid line) In both of the double-row swivel types (broken lines), when the supply air pressure to the cylinder is reduced to 19.8 N / cm ² , the brake ON state cannot be released by the air cylinder in the region where the rotational speed is 0 to 600 rpm.
[0008]
When such a trouble occurs, the eddy current type reduction gear is inspected and replaced after stopping the vehicle. Therefore, it is required to recover to a state in which business travel is not hindered by a short-term emergency treatment. In addition, the eddy current speed reducer is effective during traveling in the state of braking ON, which causes troubles in traveling and magnetic force leaks to the outside, which causes safety problems.
[0009]
The present invention has been made in view of the above-described conventional problems, and a method for forcibly releasing from the braking ON position to the braking OFF position at the time of inspection and replacement of the eddy current reduction device after the vehicle stops, and It is an object of the present invention to provide a forced release mechanism that implements this method, and an eddy current type speed reducer equipped with this forced release mechanism.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the method for forcibly releasing the brake OFF position in the eddy current type speed reducer according to the present invention is such that the piston or rod of the actuator at the position where the permanent magnet is in the brake ON state is replaced with the piston at this position. Alternatively, the permanent magnet is forced into a braking OFF state by forcibly moving the screw shaft from the side facing the rod by reciprocating. And by doing in this way, at the time of inspection and exchange of the eddy current type reduction gear after the stop of the vehicle when trouble that the braking ON state cannot be canceled occurs, the cancellation from the braking ON to the braking OFF can be forcibly performed. It becomes like this.
[0011]
In the present invention, the “side facing the piston or rod” means a place or position having a fulcrum that can apply a force in a direction parallel to the moving direction of the piston or rod. In the screw of the present invention, the fulcrum, the action point, and the force point are on the same axis parallel to the moving direction, so that the forced release can be performed safely with a simple structure. “Screw advancement / retraction” means that the screw itself advances or retracts in the direction of the rotation axis of the screw rotation axis when the screw rotates due to the spiral of the screw. By the way, when it says screwing, it means only forward.
[0012]
In the method of the present invention described above, the piston or rod of the actuator is screwed from the side facing the piston or rod in the brake-on state from the position where the permanent magnet is in the brake-off state to the position where the brake is off. This can be implemented by a forcible release mechanism to the braking OFF position in the eddy current type speed reducer according to the present invention provided with a moving means for moving the shaft by screwing back and forth .
[0013]
In the eddy current type speed reducer according to the present invention having the forcible release mechanism according to the present invention, the eddy current type speed reducer in which the trouble that the brake ON state cannot be released occurs is braked off with a short-time emergency measure. As a permanent measure, it is possible to restore the state where there is no support in traveling, and to continue the business operation until the replacement, that is, until the replacement, and at the time of replacement Since there is almost no external leakage of the magnetic force at, it can be safely exchanged.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The forced release method to the braking OFF position in the eddy current type reduction gear according to the present invention is a method for forcibly moving the permanent magnet constituting the eddy current type reduction gear from the braking ON position to the braking OFF position, The permanent magnet is braked off by forcibly moving the piston or rod of the actuator, which is the drive source at the position where the permanent magnet is in the braking ON state, by screwing back and forth of the screw shaft from the side facing the piston or rod at this position. It is a state and a sushi.
[0015]
According to the forced release method to the braking OFF position in the eddy current reduction device according to the present invention, at the time of inspection and replacement of the eddy current reduction device after stopping the vehicle when a trouble that the braking ON state cannot be released occurs, The permanent magnet can be forcibly released from the braking-on position to the braking-off position simply by reciprocating the screw shaft.
[0016]
In addition, the forced release mechanism to the braking OFF position in the eddy current reduction device according to the present invention is added to the ON-OFF switching device of the eddy current reduction device, and brakes the permanent magnet constituting the eddy current reduction device. A mechanism for forcibly moving the actuator from the ON position to the brake OFF position, wherein the piston or rod of the actuator as a drive source is moved from the position where the permanent magnet is in the brake ON state to the position where the brake is OFF. It is provided with moving means for moving the screw shaft by screwing back and forth from the side facing the piston or rod at the position.
[0017]
At that time, when a screw insert is interposed in the threaded portion of the screw shaft, the threaded portion of the screw shaft can be easily worked. In consideration of the force acting on the threaded portion at the time of release, the screw shaft screwed at a position facing the piston end or rod end of the casing attached to the piston or rod on the withdrawal side. the engaging portion, it is desirable to form a thicker than other portions. Here, “screwing” refers to a state in which a male screw and a female screw are in contact with each other and meshed with each other.
[0018]
【Example】
Hereinafter, the forced release mechanism to the brake OFF position in the eddy current type speed reducer according to the present invention will be described based on the embodiment shown in FIGS. 1 to 3, and the present invention using the forced release mechanism according to the present invention will be described. The compulsory release method and the eddy current reduction device according to the present invention including the forced release mechanism according to the present invention are described.
FIG. 1 is a diagram for explaining a first embodiment of a mechanism for forcibly releasing braking to a braking OFF position in an eddy current type speed reducer according to the present invention, FIG. 2 is a diagram for explaining a second embodiment, and FIG. It is a figure explaining an Example.
[0019]
First, an example of an ON-OFF switching device in a double-row swirl type eddy current reduction device to which the present invention is applied will be described with reference to FIG.
FIG. 4 shows a structure in which compressed air is not supplied to one of the two double-acting cylinders when releasing the brake, and an air release port is provided in the cylinder to reduce the consumption of compressed air when releasing the brake. One of the two air cylinders 10b provided on the circumference of the support is a double-acting type, and the other air cylinder 10a is substantially a single-acting type air cylinder. .
[0020]
A U-shaped link support metal 11 is attached to the tip of each rod 10c, and each link support metal 11 holds a roller 12 held by the yoke link 9 so as to be freely rotatable. is doing.
[0021]
Further, when compressed air is supplied to the piston side pressure receiving chambers 10aa and 10ba from the ports 10ab and 10bb provided on the piston side pressure receiving chambers 10aa and 10ba side of the air cylinders 10a and 10b to advance the piston 10d, the yoke link 9, the movable support ring 6 b is rotated to a position where the polarities of the two permanent magnets 5 a and 5 b on the fixed side and the rotating side facing one switch plate 4 are the same.
[0022]
In this state, a magnetic circuit is formed between the permanent magnets 5a and 5b adjacent in the circumferential direction, including the adjacent switch plate 4 and the inner peripheral surface of the cylindrical portion of the rotor 2, and is in a so-called braking ON state. An eddy current phenomenon occurs on the inner peripheral surface of the cylindrical portion, which generates a braking torque, and the vehicle is decelerated in accordance with the braking torque.
[0023]
When switching from the brake-on state to the brake-off state, the compressed air from the piston-side pressure receiving chambers 10aa and 10ba is removed from the ports 10ab and 10bb, and provided on the rod-side pressure receiving chamber 10bc side of the double-acting air cylinder 10b. When compressed air is supplied from the port 10bd to the rod-side pressure receiving chamber 10bc of the double-acting air cylinder 10b, the piston 10d moves backward, and the movable support ring 6b is connected to one switch plate 4 via the yoke link 9. The two permanent magnets 5a and 5b on the rotation side rotate to positions where the polarities are opposite to each other.
[0024]
In FIG. 4, 10ac is a rod side pressure receiving chamber of the single acting air cylinder 10a, and 10ad is a port provided on the rod side pressure receiving chamber 10ac side of the single acting air cylinder 10a.
[0025]
In this state, a magnetic circuit is formed between one switch plate 4 and the two permanent magnets 5a and 5b facing the switch plate 4, and the magnetic flux generated from the permanent magnets 5a and 5b does not act on the inner peripheral surface of the cylindrical portion of the rotor 2. Therefore, no eddy current flows and no braking torque is generated, so that a so-called braking OFF state is established.
[0026]
In the eddy current type speed reducer provided with the ON-OFF switching device as described above, for example, a functional defect of the air system occurs due to braking ON (operation ON), and the operating pressure decreases, and braking is performed by the air cylinders 10a and 10b. If the ON state cannot be released, the eddy current speed reducer will be effective during traveling, and the stator and rotor will be adsorbed and damaged when the eddy current speed reducer is inspected or replaced after the vehicle is stopped. In addition to this, there is a safety problem due to leakage of the magnetic force to the outside until the replacement.
[0027]
Therefore, in the present invention, for example, as shown in FIG. 1, the rod 10c of the air cylinder 10a (10b) is moved from the position where the permanent magnet (5b) is in a braking ON state indicated by an imaginary line in FIG. The moving means for forcibly moving to the position where the brake is in the OFF state indicated by the solid line is configured to be attachable to the side facing the rod 10c in the position where the brake is in the ON state.
[0028]
In the first embodiment shown in FIG. 1, as the moving means, a casing 21 is attached to the side of the rod 10c of the air cylinder 10a (10b), and the screw shaft 22 is located at a position facing the end of the rod 10c in the casing 21. Is shown in FIG.
[0029]
That is, in the first embodiment shown in FIG. 1, the screw shaft 22 screwed into the casing 21 is screwed to move the rod 10c at the position where the permanent magnet (5b) is in the braking ON state to the braking OFF state. It moves to the position that becomes.
[0030]
Accordingly, the screw shaft 22 has a strength sufficient to move the rod 10c by overcoming the magnetic attractive force at the time of braking ON (the thickness of the shaft portion) and the permanent magnet (5b) from the position of braking ON to braking OFF. Needless to say, it has a shaft length L that can be moved to the position, and the screw pitch is also an optimum value depending on the relationship between the magnetic attraction force and the force required to screw the screw shaft 22. To decide.
[0031]
In the first embodiment shown in FIG. 1, the shaft portion length L is such that at least the wall thickness L1 at the threaded portion of the casing 21, the inner surface of the casing 21 at the threaded portion, and the permanent magnet (5b) are at the braking ON position. The distance L2 between the tips of the link support hardware 11 attached to the end of the rod 10c and the retraction amount L3 of the rod 10c necessary to move the permanent magnet (5b) from the brake ON position to the brake OFF position ( This retraction amount L3 is moved by adsorption by the adjacent permanent magnet (5a) when the permanent magnet (5b) is moved to the vicinity of the brake OFF position in the double-row turning method, and therefore the braking ON position of the permanent magnet (5b). And a length shorter than the distance L4 between the positions of the rod 10c corresponding to the brake OFF position).
[0032]
By the way, in the case of the first embodiment shown in FIG. 1, the screw insert 23 is interposed in the screwed portion of the screw shaft 22 in the casing 21, and the screw insert 23 is screwed with the screw shaft 22. The casing 21 does not need to be threaded, and the casing 21 is made easy to work with. Note that reference numeral 24 in FIG. 1 denotes a seal cap that is screwed into the screw insert 23 at a time other than when the brake is forcibly released.
[0033]
Further, in the case of the first embodiment shown in FIG. 1, the screwing portion of the screw shaft 22 in the casing 21 receives the force when the rod 10 c is forcibly moved. It is shown that it can withstand the force at the time of forced movement by making its thickness thicker than other parts.
[0034]
The forced release mechanism to the braking OFF position in the eddy current type speed reducer according to the present invention is configured as described above, and the permanent magnet 5b that cannot be released from the braking ON state due to some trouble by using the forced release mechanism of the present invention, When forcibly moving from the brake ON position to the brake OFF position, after removing the seal cap 24 screwed into the screw insert 23 of the screwed portion of the casing 21 and screwing the screw shaft 22 into the screw insert 23, By rotating the screw shaft 22, the rod 10c at a position where the permanent magnet 5b is in the braking ON state is forcibly retracted to a position where the permanent magnet 5b is in the braking OFF state. This is the forcible release method to the braking OFF position in the eddy current type reduction gear according to the present invention.
[0035]
Further, in the eddy current type speed reducer according to the present invention provided with the above-described forced release mechanism of the present invention, when a trouble that the braking ON state cannot be canceled occurs, recovery to a state where there is no hindrance to business travel, This method of the present invention can be carried out in a short time and safely.
[0036]
In the embodiment shown in FIG. 1, the one provided in the ON-OFF switching device of the double row swirl type eddy current reduction device is shown, but it is needless to say that it can also be applied to the single row swivel type. . Further, as shown in FIG. 2, the forcible release mechanism according to the present invention having the same configuration as that of FIG. 1 can be applied to the shaft slide system.
[0037]
In the above embodiments, the rods 10c of the air cylinders 10a and 10b are forcibly moved by pushing them to the retracted side, and the permanent magnets are brought into the braking OFF state. As shown, a screw shaft 22 that is screwed into the moving means, for example, the piston 10d, is inserted from the opposite side of the rod 10c of the cylinder constituting the air cylinders 10a and 10b. The piston 10d can be forcibly moved by moving it in the pulling direction, and the permanent magnet can be brought into a braking OFF state.
[0038]
Furthermore, in the above embodiment, the eddy current type speed reduction device provided with the drum type rotor has been described as an example. However, the present invention is not limited to this, for example, the eddy current type speed reduction device provided with the disk type rotor. Needless to say, the present invention can also be applied to a reduction gear. In addition, the moving means for forcibly moving the piston or rod of the actuator that is the drive source is the simplest in structure with the screw type in this example, so it is reliable and safe, and even in unforeseen circumstances It is the best in that it can be forcibly released.
[0039]
【The invention's effect】
As described above, according to the present invention, when a trouble that the brake-on state cannot be released occurs, the permanent magnet is braked by a simple operation with a rotor that is difficult to remove in the state of the brake-on state. It is now possible to forcibly release from the ON position to the braking OFF position, eliminating problems during traveling and the problem of safety deterioration due to magnetic leakage, and ensuring that there are no problems with business travel by short-term emergency measures. It can be recovered. In addition, according to the present invention, it is possible to prevent the rotor from being magnetized and causing noise when the brake is turned off, and dust from being attached.
[Brief description of the drawings]
1A and 1B are diagrams for explaining a first embodiment of a mechanism for forcibly releasing braking to a brake OFF position in an eddy current type speed reducer according to the present invention, wherein FIG. 1A is a front view, and FIG. 1B is attached to a rod side of a cylinder; It is a top view of a casing part.
FIG. 2 is a front view for explaining a second embodiment of a mechanism for forcibly releasing braking to a brake OFF position in the eddy current type speed reducer according to the present invention.
FIG. 3 is a front view for explaining a third embodiment of a mechanism for forcibly releasing braking to a brake OFF position in the eddy current type speed reducer according to the present invention.
FIG. 4 is a diagram for explaining an example of an ON-OFF switching device of an eddy current type speed reducer.
FIG. 5 is an explanatory diagram of the structure of a shaft slide type eddy current reduction device.
FIG. 6 is an explanatory view of the structure of a single-row swirl type eddy current type speed reducer.
FIG. 7 is an explanatory diagram of the structure of a double-row swirl type eddy current type speed reducer.
FIG. 8 is a diagram showing an example of a relationship between a rotor rotational speed and a required operating pressure in an eddy current type reduction gear of a single row turning type and a double row turning type.
[Explanation of symbols]
5,5b Permanent magnets 10a, 10b Air cylinder 10c Rod 10d Piston 21 Casing 22 Screw shaft 23 Screw insert

Claims (5)

A method of forcibly moving a permanent magnet constituting an eddy current type deceleration device from a braking ON position to a braking OFF position,
The permanent magnet is braked off by forcibly moving the piston or rod of the actuator, which is the drive source at the position where the permanent magnet is in the braking ON state, by screwing back and forth of the screw shaft from the side facing the piston or rod at this position. A forced release method to a braking OFF position in an eddy current type speed reducer characterized by being in a state. A mechanism that is added to the ON-OFF switching device of the eddy current type reduction device and forcibly moves the permanent magnet constituting the eddy current type reduction device from the braking ON position to the braking OFF position,
The piston or rod of the actuator, which is the drive source, is screwed on the screw shaft from the side facing the piston or rod in the brake-on state from the position where the permanent magnet is in the brake-off state to the position where the brake is off. A forcible release mechanism to a braking OFF position in an eddy current type speed reducer comprising a moving means for moving by advancing and retreating . The forced release mechanism to the braking OFF position in the eddy current type speed reducer according to claim 2, wherein a screw insert is interposed in a threaded portion of the screw shaft. That the threaded portion of the piston end or the screw shaft screwed into position rod end facing the casing mounted on the outlet retraction side of the piston or rod and no thicker than other portions The forced release mechanism to the braking OFF position in the eddy current type speed reducer according to claim 2 or 3 . An eddy current type speed reducer comprising the forcible release mechanism to the braking OFF position according to any one of claims 2 to 4 .

Images