JP2000280884A - Wire tension adjusting method for parking brake and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce man-hours required by the adjustment of wire tension for a parking brake. SOLUTION: In the parallel portions of loose brake wires 63 and 64, presciribed tension is given to the brake wires 63 and 63 by energizing them in the direction that a space between them is widened using a brake wire energizing jig 30 set up in a space between the brake wires 63 and 64. Next, when a wire tension adjustment mechanism 50 is so adjusted as to let tension be increased, the brake wires 63 and 64 are gradually tightened. In this case, a space is so devised as to be narrowed while being energized in the widening direction by constant force so as to let tension given to the brake wires 63 and 64 first be maintained. And when both the brake wires 63 and 64 are set up at a prescribed space, adjustment by the wire tension adjustment mechanism 50 is turned out to be over.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for adjusting a wire tension of a parking brake.

[0002]

2. Description of the Related Art As shown in FIG. 5A, in a parking brake mechanism of a vehicle, for example, in a center lever type, a center lever 60, a brake cable 61, a wire tension adjusting mechanism 50, brake wires 63 and 64, a parking wire are provided. The center lever 60 comprises brakes 65, 66 and the like.
Is pulled by a predetermined amount, the brake cable 61 is pulled, and the two brake wires 63, 64 connected via the wire tension adjusting mechanism 50 are pulled, whereby the parking brakes 65, 66 of the left and right rear wheels are pulled. , And the vehicle can be stopped, that is, kept in a parked state.

Here, the brake cable 61 and the two brake wires 63 and 64 are connected via a wire tension adjusting mechanism 50 as shown in a dashed-dotted circle in FIG. FIG. 5B is an enlarged view of the configuration outline. That is, the end of the brake cable 61 is connected to the adjust bolt 54 having a long shaft length, and the brake wires 63 and 64 are locked to the equalizer 52, respectively. The adjust bolt 54 to which the brake cable 61 is connected penetrates substantially the center of the equalizer 52 from a direction opposite to the brake wires 63 and 64, and an adjustment nut 56 is screwed to an end thereof.

The brake wires 63 and 64 are inserted into the outer casings 63a and 64a, and one ends of the brake wires 63 and 64 are spaced apart from each other by a predetermined distance in the vehicle width direction.
2 and the other end is connected to parking brakes 65 and 66. One ends of the outer casings 63a, 64a are fixed to the vehicle body near the parking brakes 65, 66, and the other ends are spaced apart from the equalizer 52 by a predetermined distance behind the vehicle. Is fixed to the vehicle body at the same interval as the other end of the vehicle. Therefore, the outer casings 63a, 64
Between the other end of “a” and the equalizer 52, the brake wires 63 and 64 are located in parallel with each other. Further, the equalizer 52 is swingable with respect to the brake cable 61, and keeps the tension of the brake wires 63 and 64 even.

As described above, the brake cable 61 and the brake wires 63 and 6 are interposed with the wire tension adjusting mechanism 50 interposed therebetween.
4 prevents the adjustment bolt 56 screwed to the end of the adjustment bolt 54 from being pulled out of the equalizer 52 even if the brake cable 61 is pulled by the center lever 60. The position of the equalizer 52 on the adjusting bolt 54 is determined by the screwing position of the adjusting nut 56.

That is, the positional relationship between the equalizer 52 and the brake cable 61 and the connection distance between the brake cable 61 and the brake wires 63 and 64 are set according to the screwing position of the adjusting nut 56. By adjusting (L61 shown in FIG. 5B), brake wires 63, 64 stretched between the brake cable 61 and the parking brakes 65, 66 are provided.
, A predetermined tension can be set. Therefore, the screwing amount of the adjustment nut 56,
In other words, the tension of the brake wires 63 and 64 can be adjusted by managing the protrusion L61 of the adjustment bolt 54.

More specifically, as shown in FIG. 5B, a nut runner 7 capable of automatically screwing an adjustment nut 56 is provided.
By setting the depth L62 of the zero box portion 72 to coincide with the predetermined screwing amount L61 of the adjusting nut 56, the nut runner 70 stops automatically when the adjusting nut 56 is screwed to L61. Controlled. Thereby, the tension of the brake wires 63 and 64 is set to a constant amount.

[0008]

However, as described above, the protrusion L of the adjusting bolt 54 shown in FIG.
It is known that when trying to control the tension of the brake wires 63 and 64 using 61, an error of several mm in the wire length of the brake wires 63 and 64 appears directly as an error in the tension of the brake wires 63 and 64. .
Therefore, the brake wire 63,
Therefore, the tension of the T.64 must be adjusted, which leads to a problem of increasing the number of adjustment steps.

This problem can be considered to be solved by strictly defining the wire lengths of the brake wires 63 and 64. However, if the accuracy of the lengths of the brake wires 63 and 64 is improved, a new man-hour is required. Leads to an increase in Further, in practice, even if only the wire length is specified, the brake wires 63 and 64 themselves can be stretched by a predetermined tension. Therefore, such a strict definition of the wire length cannot solve the problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method and an apparatus for adjusting the wire tension of a parking brake, which can reduce the man-hour for adjusting the wire tension of the parking brake. Is to do.

[0011]

According to a first aspect of the present invention, there is provided a method for adjusting a wire tension of a parking brake, wherein the first brake wire is connected to one of the left and right parking brakes. And at least a portion of a second brake wire connected to the other parking brake is positioned parallel to each other, and both brake wires are connected to a brake operating unit via one wire tension adjusting mechanism, and the parking brake operating unit A wire tension adjusting method for a parking brake in which both brake wires are equally pulled by an operation so that the parking brakes of the left and right wheels are simultaneously operated, wherein the first brake wire and the second brake wire in a loose state are provided. Adjusting the wire tension adjusting mechanism while urging the parallel portions of the brake wires with a constant force in a direction in which the distance between them extends. By gradually tensioned both brake wires, parallel portions of the both brake wire it is technically characterized in that to end the adjustment of the wire tension adjusting mechanism upon reaching a predetermined distance.

According to another aspect of the present invention, the above object is achieved.
In the parking brake wire tension adjusting device, at least a portion of a first brake wire connected to one parking brake and at least a portion of a second brake wire connected to the other parking brake among the parking brakes of the left and right wheels are parallel to each other. And both brake wires are connected to the brake operation unit via one wire tension adjustment mechanism,
A wire tension adjusting method for a parking brake in which both brake wires are evenly pulled by operation of the parking brake operating unit, and the parking brakes of the left and right wheels are simultaneously operated, wherein the wire tension adjusting mechanism is adjusted. A possible power tool, biasing means for biasing the parallel portions of the two brake wires with a constant force in a direction in which the distance between them increases, and detecting that the parallel portions of the two brake wires have a predetermined distance. And a control unit for stopping the operation of the power tool based on a detection signal from the detection unit.

Further, in the wire tension adjusting device for a parking brake according to a third aspect of the present invention, in the second aspect, the urging means is provided on the extendable main body and the main body, and the urging means is provided with the expansion and contraction of the main body. A first brake wire locking portion and a second brake wire locking portion having an increased / decreased distance from each other, an expansion / contraction force applying portion for applying an expansion / contraction force to the main body, and a control portion for controlling the expansion / contraction force. This is a technical feature.

According to the first aspect of the present invention, the parallel portions of the first brake wire and the second brake wire in the slack state are urged with a predetermined force in a direction in which the distance between the first and second brake wires expands, so that the two brake wires have a predetermined force. Apply tension. Next, when the wire tension adjusting mechanism is adjusted to increase the tension, both brake wires are gradually tightened. At this time, the distance between the two brake wires is reduced while urging the brake wires with a constant force in the expanding direction so as to maintain the initially applied tension. The adjustment of the wire tension adjusting mechanism is terminated when both brake wires have a predetermined interval. In other words, the tension between the two brake wires is adjusted so as to be at a predetermined interval when urged by a predetermined force in a direction in which the interval is expanded. Dimensional variation has no effect.

According to the second aspect of the present invention, the parallel portions of the first brake wire and the second brake wire, which have been loosened by the urging means, are first urged by a predetermined force in a direction in which the distance between the first and second brake wires increases. A predetermined tension is applied to the wire.
Next, when the wire tension adjusting mechanism is adjusted to increase the tension by the power tool, both brake wires are gradually tightened. At this time, the distance between the two brake wires is reduced while keeping the urging force of the urging means constant so that the two brake wires maintain the initially applied tension. Then, when the predetermined distance between the two brake wires is reached, this is detected by the detecting means, and the operation of the power tool is stopped. In other words, the tension of the two brake wires is adjusted so as to be at a predetermined interval when urged by a predetermined force in the direction in which the interval is expanded. Variation has no effect.

According to the third aspect of the present invention, when the wire tension adjusting mechanism is adjusted to increase the tension by the power tool,
By reducing the main body of the urging means while maintaining a constant elongation, the distance between the two brake wires is reduced while maintaining the initially applied tension.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method and an apparatus for adjusting a wire tension of a parking brake according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG. First, the configuration of a wire tension adjusting device (hereinafter referred to as a “tension adjusting device”) 20 for a parking brake according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2, the tension adjusting device 20 mainly includes a control panel 21, an electromagnetic valve 22, a primary air supply source 23, an air tank 24, a precision regulator 25, a wire urging jig 30,
It is composed of a nut runner 70.

The control panel 21 includes an input / output device (not shown), an arithmetic device, a storage device, an auxiliary storage device, and the like, and performs predetermined input / output processing and arithmetic processing based on a control flow (see FIG. 4) described later. And so on. Specifically, arithmetic control and the like are performed in accordance with predetermined control conditions, and an open / close valve signal is output to the electromagnetic valve 22 or a position detection signal is input from the wire urging jig 30.

The solenoid valve 22 includes a 4-port 2-position solenoid switching valve (hereinafter, referred to as a "4-port solenoid valve") 22a and a 2-port 2-position solenoid switching valve (hereinafter, referred to as a "2-port solenoid valve").
22b, and is configured as a double system that operates simultaneously. These electromagnetic switching valves 22 constituting the electromagnetic valve 22
Since the control panels 21 a and 22 b control the on-off valves by the control panel 21, predetermined signal lines capable of exchanging on-off valve signals are provided between the solenoid valve 22 and the control panel 21. The four-port solenoid valve 22a is used for controlling the air pressure supplied to the wire urging jig 30 from a primary air supply source 23 described later, and is used for the two-port solenoid valve 2a.
2b is also from the primary air supply source 23 to the nut runner 7
Used to control the air pressure supplied to zero.

The primary air supply source 23 is configured to be able to supply a predetermined pressure air, so that the pressure air sent from the primary air supply source 23 is supplied to the electromagnetic valve 2.
It is supplied to the wire urging jig 30 and the nut runner 70 via the second and the like. That is, the pressurized air supplied from the primary air supply source 23 to the wire urging jig 30 is sent through the air tank 24, the precision regulator 25, and the four-port solenoid valve 22 a of the solenoid valve 22.
The pressurized air supplied to the nut runner 70 from 3 is sent through a two-port solenoid valve 22 b of the solenoid valve 22.

Here, the reason why the air tank 24 and the precision regulator 25 are provided in the middle of the path where the compressed air is supplied to the wire urging jig 30 is as follows. That is, the air tank 24 is located upstream of the pressure air of the precision regulator 25.
Is provided, even if the supply pressure of the primary air supply source 23 fluctuates, the pressure fluctuation is absorbed by the air tank 24 having a buffering function, and stable pressure air is supplied to the precision regulator 25. Further, by providing a precision regulator 25 on the upstream side of the compressed air of the solenoid valve 22, a factor of pressure fluctuation due to switching of the four-port solenoid valve 22a or the like is absorbed, and a constant pressure air is supplied to the wire urging jig 30.
Because it can be supplied to The configuration of the wire urging jig 30 will be described in detail after an outline of the configuration of the nut runner 70 is described.

As described above with reference to FIG. 5, the nut runner 70 has a function of automatically screwing the adjustment nut 56 shown in FIG. 1 by air pressure. In other words, the pressurized air is supplied to the box portion 73 rotatably attached to the tip by a manual valve that opens by grasping the lever portion of the nut runner 70 in a state where the predetermined pressurized air is supplied, The adjustment nut 56 is rotated in the tightening direction of the adjustment nut 56, and the adjustment nut 56 housed in the box portion 73 is automatically screwed into the adjustment bolt 54. Note that the depth of the box portion 73 is set to have a margin enough to exceed the planned screwing amount of the adjusting nut 56. Therefore, the adjustment bolt 54
The adjustment nut 56 can be screwed into the adjustment bolt 54 without any problem even if the allowance of the protrusion is excessively longer than expected.

Next, the configuration of the wire urging jig 30 will be described in detail with reference to FIG. FIG. 1 shows a wire urging jig 30.
Is schematically shown between the parallel portions of the brake wires 63 and 64. As shown in FIG. 1, the wire urging jig 30 is configured by attaching four rod-shaped posts to a general-purpose pneumatic cylinder.
1, a main body composed of a piston rod 32, a movable end 33, a guide rod 34, input / output ports 35a and 35b,
It is composed of posts 37a, 37b, 38a, 38b. The wire urging jig 30 is provided with a reed switch 36.

A piston (not shown) attached to a piston rod 32 is slidably provided inside the air cylinder 31. Both chambers separated by the piston as a wall have air with the outside. The input / output ports 35a and 35b which enable the distribution of the data are communicated with each other.
As a result, the internal pressure balance in both rooms fluctuates depending on the magnitude relationship between the air pressure supplied to the input / output port 35a and the air pressure supplied to the input / output port 35b. By controlling the internal pressure balance, the piston slides. The movement of the piston rod 32 can be controlled together with the movement. That is, the four-port solenoid valve 2 of the solenoid valve 22 described above.
By controlling 2a, it is possible to switch between the supply of the pressurized air supplied from the primary air supply source 23 to the air cylinder 31 and the discharge of the pressurized air released from the air cylinder 31 to the external space. And the movement of the piston rod 32 can be controlled.

The movable end 33 is attached to the tip of the piston rod 32, and further has two guide rods 34 positioned in parallel so as to sandwich the piston rod 32 from both sides in the radial direction. This guide rod 34
Is for preventing rotation of the movable end 33 due to movement of the piston rod 32 and the like.
37b and the posts 38a and 38b are placed so as to face each other.

The reed switch 36 is constituted by a pair of a magnet part 36a and a switch part 36b.
When the switch unit 36b that moves together is adjacent, the switch is turned on. That is, the magnet portion 36a is fixed at a predetermined position in advance, and when the switch portion 36b approaching with the movement of the piston rod 32 is adjacent within a predetermined range, the switch contact is turned off (off state) to conducting (on state). ) To transmit the position detection signal of the wire urging jig 30 to the control panel 21 described above. The predetermined position of the magnet portion 36a corresponds to the position of the piston rod 32 when the brake wires 63, 64 locked to the posts 37a, 37b and the posts 38a, 38b described below reach the set target tension. The required number of samples were collected in advance and determined in advance.

Posts 37a, 37b, 38a, 38b
Is a drum-shaped rod having both ends formed with a large diameter, and the brake wires 63 and 64 abutting from the radial direction are connected to the post 37.
a, 37b, 38a, and 38b are formed in a shape that is easily moved to the center in the axial direction. Thus, once the brake wires 63, 64 are locked to the posts 37a, 37b, 38a, 38b as described later, the posts 37a, 37
b, 38a, 38b. Further, two posts 37a, 37b, 38a, and 38b are provided on the upper surface of the end of the air cylinder portion 31 on the movable end portion 33 side (post 37).
a, 37b), and two (posts 38a, 38b) on the upper surface of the movable end 33 are fixed in an upright state so as to face each other at the four corners of the rectangular shape. Thereby, the air cylinder unit 3 is moved with the movement of the piston rod 32.
When the movable end 33 moves in the separation direction of the first post 1, the post 3 moves away from the posts 37 a and 37 b which are in opposition to each other.
8a and 38b move, and the distance between them increases.

Also, as described above, the air cylinder 31
The posts 37a and 37b are provided, and the movable end 33 is also provided with two posts.
Since the book posts 38a and 38b are provided, the wire brake wire 63 (or the brake wire) that is hung between the posts 37a and 37b (or the posts 38a and 38b) in the length direction of the brake wires 63 and 64 is provided. 64), the distance between the parallel portions of the two brake wires 63, 64 after expansion by the wire urging jig 30 can be reduced by the length. Furthermore, since the four corners of the rectangular shape are fixed in an upright state so as to face each other, the reaction force due to the tension of the brake wires 63 and 64 is equally applied to the posts 37a and 37b and the posts 38a and 38b. Prevents the wire biasing jig 30 from rotating due to unbalance of the reaction force applied to the post, compared to a single post or to a case where the post is not located at each of the four corners of the rectangle. can do. Therefore,
The wire urging jig 30 can be used even in a place where there is no room to sufficiently expand the space between the brake wires 63 and 64, and furthermore, it is possible to prevent the workability due to the rotation of the wire urging jig 30 from being impaired. be able to.

In this embodiment, two posts 37a and 37b (or posts 38a and 38b) are provided on each side.
Is provided, and the brake wires 63 and 64 are hung in the length direction. For example, one large-diameter post having a diameter equal to the length obtained by adding these diameters to the interval between the posts 37a and 37b, and the air You may provide in the cylinder part 31. Since the post has a large diameter, the same effect as that in which the brake wires 63 and 64 are hung between the two posts can be obtained, and the same effect as described above can be obtained.

Next, the operation of the tension adjusting device 20 will be described with reference to FIGS.
A description will be given based on FIG. First, the brake wire 63,
Before the wire urging jig 30 is positioned between the parallel portions 64, the adjusting nut 56 of the wire tension adjusting mechanism 50 is sufficiently loosened so that the brake wires 63 and 64 are slackened. This is because both brake wires 63, 64
This is because it is difficult to set the wire urging jig 30 between the brake wires 63 and 64 when the wire is tensioned.

After the wire urging jig 30 is set between the parallel portions of the brake wires 63 and 64 and a start instruction is given to the control panel 21, the control of the tension adjusting device 20 is sequentially performed according to the control flow shown in FIG. Will be As shown in FIG. 4, first, in step 101, an initial setting is performed by a series of initialization processing of the input / output device and the storage device constituting the control panel 21. That is, a valve closing signal is transmitted to the solenoid valve 22,
Also, the work area of the storage device is cleared and the wire urging jig 3
Initialize the position detection signal from 0 and the like. This gives 4
Since both the port solenoid valve 22a and the two-port solenoid valve 22b shift to the off state, pressurized air is supplied from the primary air supply source 23 to the input / output port 35a of the wire urging jig 30, and pressure is supplied from the input / output port 35b. The air is discharged, and the nut runner 7 is supplied from the primary air supply source 23.
The supply of pressurized air to zero is cut off. Therefore, the piston rod 32 is retracted, the wire urging jig 30 is contracted, and the nut runner 70 is in a non-rotatable state.

Next, at step 103, a process of extending the wire urging jig 30 by projecting the piston rod 32 is performed. In other words, since the valve opening signal is transmitted from the control panel 21 to the solenoid valve 22 to shift from the off state to the on state, the primary air supply source 23 is controlled by the four-port solenoid valve 22a.
Is supplied to the input / output port 35b of the wire urging jig 30, and the compressed air is discharged from the input / output port 35a. Thereby, the wire urging jig 30 is extended. At this time, since the pressurized air is supplied from the primary air supply source 23 to the wire urging jig 30 via the precision regulator 25, the piston rod 32 and the movable end 33 provided at the end thereof are fixed. It is urged in the extension direction by force.

In step 105 following step 103, a process for starting the nut runner 70 is performed.
Since the electromagnetic valve 22 shifts from the off state to the on state by the processing of the previous step 103, the two-port electromagnetic valve 22b supplies compressed air from the primary air supply source 23 to the nut runner 70 almost simultaneously with the four-port electromagnetic valve 22a. .
As a result, the nut runner 70 is in a rotatable state. Therefore, when the operator grips the lever portion of the nut runner 70, the pressurized air is supplied to the box portion 73 at the tip, and the adjustment nut 56 can be tightened. . Therefore, as shown in FIG. 1, by operating the nut runner 70 in the direction of the dashed-dotted arrow and fitting the box portion 73 to the adjustment nut 56, the screwing of the adjustment nut 56 is automatically performed.

Here, the nut runner 70 is set by the operator.
When the tightening of the adjustment nut 56 proceeds by the operation of, the adjustment nut 56 moves on the adjustment bolt 54 in the direction of the brake cable 61, and is pushed by the adjustment nut 56, so that the equalizer 52 also moves in the direction of the brake cable 61. Then, the brake wire 6 that has been loosened until then
The tension T1 is urged because the tension of the equalizer 52 and the tension of the equalizer 52 in the direction of the brake cable 61 are increased. Therefore, the post 37a, 37b and the post 38a, 38 are driven by the reaction force T3 at which the brake wire 63 and the brake wire 64 are balanced with the extension force F of the wire urging jig 30.
b is urged in the direction in which the brake wires 63 and 64 are closed (see FIG. 3A).

That is, as shown in FIG. 3A, the brake wire 6 when the wire urging jig 30 is extended to the maximum.
The interval between 3 and 64 is W1, and the screwing amount of the adjusting nut 56 at this time, that is, the allowance of the adjusting bolt 54 is L1, and the interval between the magnet portion 36a and the switch portion 36b of the reed switch 36 is d1 ≠ 0. It is. The wire urging jig 30 is connected to the brake wires 63, 6 as described above.
Regardless of the tension of No. 4, it is extended by a constant force F. Further, the magnet portion 36a of the reed switch 36 is adjusted to a predetermined position given in advance as described above.

Referring back to FIG. 4, in the following step 107, a process is performed to determine whether or not the wire urging jig 30 has contracted to a predetermined position. That is, depending on the presence or absence of the position detection signal from the reed switch 36, the brake wire 63,
It is determined whether or not the piston rod 32 has contracted to a predetermined position by the reaction force acting in the closing direction of 64.
Here, as described above, since the distance between the magnet portion 36a adjusted to the predetermined position and the switch portion 36b of the reed switch 36 is distant by d1 ≠ 0, the determination in step 107 is No. Therefore, the processing shifts to step 103 described above, and the same processing as described above is performed.

Then, the nut runner 70 by the operator
When the tightening of the adjustment nut 56 is further advanced by the operation described above, the adjustment nut 56 further moves in the direction of the brake cable 61, so that the equalizer 52 pushed by the adjustment nut 56 also moves in the direction of the brake cable 61. Then, the posts 37a and 37b and the posts 38a and 38
b because the brake wires 63 and 64 that have been in contact with the b increase in tension with the further movement of the equalizer 52 (the tension T
2) The reaction force T3 is increased by the increased tension (T2-T1) of the brake wires 63 and 64 (reaction force T4), and the wire urging jig 30 is contracted (see FIG. 3B). The contraction of the wire urging jig 30 causes the brake wire 63,
The tension at 64 is reduced to the initially applied tension T1, and the reaction force is also reduced to T3.

At this time, the interval between the brake wires 63 and 64 is W2 (<W1).
4 is L2 (> L1), and the distance between the magnet portion 36a and the switch portion 36b of the reed switch 36 is d2 (<d1).
≠ 0. Therefore, as shown in FIG.
Even if the process proceeds to step 107, the distance between the magnet portion 36a and the switch portion 36b of the reed switch 36 is d2
Since it is separated by $ 0, this determination is No. Therefore, the processing shifts to step 103 described above, and the same processing as described above is performed again. The piston rod 32 is extended by a constant force F regardless of the tension of the brake wires 63 and 64.

Further, the nut runner 70 by an operator
When the adjustment nut 56 is further tightened by the operation described above, the adjustment nut 56 moves further in the direction of the brake cable 61, so that the equalizer 52 pushed by the adjustment nut 56 also integrates the movement amount in the direction of the brake cable 61. Then, the posts 37a and 37b and the post 3
Brake wires 63, 64 abutting on 8a, 38b
Increases in tension with the further movement of the equalizer 52 (tension T2), so that the increased brake wires 63, 6
The wire urging jig 30 is contracted by the tension of 4 (T2 -T1) (see FIG. 3C). This wire urging jig 30
As a result, the tension of the brake wires 63 and 64 decreases to the initially applied tension T1 and the reaction force also decreases to T3. The distance between the brake wires 63 and 64 at this time is W
3 (<W2 <W1), the allowance of the adjustment bolt 54 is L3 (>L2> L1), and the distance between the magnet portion 36a and the switch portion 36b of the reed switch 36 is d3 (<d2 <
d1) = 0 (or almost zero). Therefore, as shown in FIG. 4, when the processing of the control panel 21 proceeds to step 107, the interval between the magnet portion 36a and the switch portion 36b of the reed switch 36 is d3 = 0 (or almost zero) and is adjacent. Therefore, this determination is Yes. Therefore, the processing shifts to the next step 109. Here, the wire urging jig 30 is extended by a constant force F regardless of the tension of the brake wires 63 and 64.

In step 109, the nut runner 70
Is stopped. That is, the previous step 10
7, it was determined that the switch portion 36b was adjacent to the magnet portion 36a of the reed switch 36 fixed in advance, and the posts 37a and 37b and the post 38 were determined.
This means that the brake wires 63, 64 locked to the a, 38b have reached the set target interval. Therefore, a valve closing signal is transmitted from the control panel 21 to the electromagnetic valve 22 to shift from the ON state to the OFF state, and the supply of the pressurized air from the primary air supply source 23 to the nut runner 70 is cut off by the two-port electromagnetic valve 22b. . Thereby, the nut runner 70
Is no longer supplied with pressurized air.
Since the rotation of the nut 3 is disabled, even if the operator grips the lever of the nut runner 70, the pressurized air is not supplied to the box 73 and the tightening of the adjustment nut 56 is stopped.

In the following step 111, a process of contracting the wire urging jig 30 is performed. In other words, the solenoid valve 22 shifts from the on state to the off state by the processing of the previous step 109, so that the electromagnetic valve 22 is switched almost simultaneously with the two-port solenoid valve 22b.
Pressurized air is supplied from the primary air supply source 23 to the input / output port 35a of the wire urging jig 30 by the port electromagnetic valve 22a, and compressed air is discharged from the input / output port 35b. As a result, the wire urging jig 30 is contracted, and the wire urging jig 30 can be opened from the parallel portion of the brake wires 63 and 64 that has reached the set target interval.

In the tension adjusting device 20 described above, 4
Although the one in which the port solenoid valve 22a and the two-port solenoid valve 22b are constituted by one solenoid valve 22 has been exemplified, both may be constituted by being separated into separate four-port solenoid valves and two-port solenoid valves, respectively. .

As described above, according to the present embodiment, the brake wire urging jig 30 set between the brake wires 63 and 64 at the parallel portion of the slackened brake wires 63 and 64 provides the same. A predetermined tension is applied to the brake wires 63 and 64 by urging the brake wires 63 and 64 with a predetermined force F in a direction in which the interval is expanded. Next, when the wire tension adjusting mechanism 50 is adjusted to increase the tension, the brake wires 63 and 64 are gradually tightened. At this time, the gap is reduced while urging the brake wires 63 and 64 in the expansion direction with a constant force F so as to maintain the initially applied tension. Then, when the two brake wires 63 and 64 reach the predetermined interval W3, the wire tension adjusting mechanism 30
The adjustment of is ended. That is, the brake wires 63, 64
Since the tension is adjusted so as to become a predetermined distance W3 when the predetermined force F is applied in a direction in which the distance is expanded, the dimension of the component such as the length of the brake wires 63 and 64 is adjusted. Variation has no effect.

In this embodiment, the air cylinder 3
1 is provided with two posts 37a and 37b,
Since the two posts 38a and 38b are also provided, the posts 37a and 37b (or the posts 38a and 38b) are provided.
b) The length of the brake wire 63 (or the brake wire 64) hung in the length direction of the brake wire 63, 64 during the extension of both brake wires 63, 64 by the wire urging jig 30 Can be reduced, and since the four corners of the rectangular shape are fixed in an upright state so as to face each other, tension is evenly applied to the posts 37a, 37b and the posts 38a, 38b. As compared with the case where only one post is used, the wire urging jig 30 itself can be prevented from rotating due to imbalance of the tension applied to the post. Therefore, the wire urging jig 30 can be used even in a place where there is no room to sufficiently expand the distance between the brake wires 63 and 64, and the workability due to the rotation of the wire urging jig 30 is not impaired. There is an effect that the man-hours for adjusting the parking brakes 65 and 66 can be reduced.

[0045]

According to the first aspect of the present invention, first, the parallel portions of the loosened first brake wire and the second brake wire are urged by a predetermined force in a direction in which the distance between the first and second brake wires is expanded, so that the two brake wires are applied to both the wires. A predetermined tension is applied. Next, when the wire tension adjusting mechanism is adjusted to increase the tension, both brake wires are gradually tightened. At this time, the distance between the two brake wires is reduced while urging the brake wires with a constant force in the expanding direction so as to maintain the initially applied tension. The adjustment of the wire tension adjusting mechanism is terminated when both brake wires have a predetermined interval. In other words, the tension between the two brake wires is adjusted so as to be at a predetermined interval when urged by a predetermined force in a direction in which the interval is expanded. Dimensional variation has no effect. Therefore, there is an effect that the man-hour for adjusting the wire tension of the parking brake can be reduced.

According to the second aspect of the present invention, the parallel portions of the first brake wire and the second brake wire, which are loosened by the biasing means, are first urged by a predetermined force in a direction in which the distance between the first and second brake wires increases. A predetermined tension is applied to the wire.
Next, when the wire tension adjusting mechanism is adjusted to increase the tension by the power tool, both brake wires are gradually tightened. At this time, the distance between the two brake wires is reduced while keeping the urging force of the urging means constant so that the two brake wires maintain the initially applied tension. Then, when the predetermined distance between the two brake wires is reached, this is detected by the detecting means, and the operation of the power tool is stopped. In other words, the tension of the two brake wires is adjusted so as to be at a predetermined interval when urged by a predetermined force in the direction in which the interval is expanded. Variation has no effect. Therefore,
There is an effect that the man-hour for adjusting the wire tension of the parking brake can be reduced.

According to the third aspect of the present invention, when the wire tension adjusting mechanism is adjusted to increase the tension by the power tool,
By reducing the main body of the urging means while maintaining a constant elongation, the distance between the two brake wires is reduced while maintaining the initially applied tension. As a result, the tension of the two brake wires is adjusted so that the predetermined interval is obtained when the gap is urged in a direction in which the interval is expanded. Has no effect. Therefore, there is an effect that the man-hour for adjusting the wire tension of the parking brake can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a state in which a wire urging jig of a tension adjusting device according to an embodiment of the present invention is positioned between parallel portions of a brake wire.

FIG. 2 is a schematic configuration diagram illustrating a system configuration of a tension adjusting device according to the present embodiment.

FIGS. 3A and 3B are schematic views showing the operation of a wire urging jig of the tension adjusting device according to the embodiment; FIG. 3A shows a state at the start of adjustment; FIG. 3 (C) shows the state in which the adjustment has been completed.

FIG. 4 is a flowchart illustrating an outline of control of the tension adjusting device according to the present embodiment.

5 (A) is a schematic diagram showing an operation mechanism of a center lever type parking brake, and FIG. 5 (B) is a diagram showing a wire tension adjusting mechanism shown in a dashed line circle of FIG. 5 (A). FIG. 10 is a schematic explanatory view showing a state of adjustment by a conventional adjustment method.

[Explanation of symbols]

Reference Signs List 20 tension adjusting device 21 control panel (control means, control section) 22 solenoid valve (biasing means, expansion / contraction section) 23 primary air supply source (biasing section, expansion / contraction section) 24 air tank (biasing section, expansion / contraction section) Force applying part) 25 Precision regulator (urging means, stretching force applying part) 30 Wire urging jig (urging means) 37a, b post (urging means, first brake wire locking part) 38a, b post ( Urging means, second brake wire locking portion 50 wire tension adjusting mechanism 52 equalizer 54 adjust bolt 56 adjusting nut 60 center lever (brake operating portion) 63 brake wire (first brake wire) 64 brake wire (second brake wire) ) 70 Nut runner (power tool)

Claims (3)

[Claims] At least a part of a first brake wire connected to one parking brake and at least a portion of a second brake wire connected to the other parking brake of the left and right parking brakes are positioned parallel to each other,
The two brake wires are connected to the brake operating unit via one wire tension adjusting mechanism, and the operation of the parking brake operating unit causes the two brake wires to be pulled evenly so that the parking brakes of the left and right wheels operate simultaneously. A wire tension adjusting method for a parking brake, comprising: applying a constant force to a parallel portion of a loosened state of the first brake wire and the second brake wire in a direction in which a distance between the wires is extended; The wire tension of the parking brake is characterized by gradually adjusting the tension of the brake wires by adjusting the tension adjusting mechanism, and terminating the adjustment of the wire tension adjusting mechanism when the parallel portions of the both brake wires are at a predetermined interval. Adjustment method. 2. At least a part of a first brake wire connected to one parking brake and at least a part of a second brake wire connected to the other parking brake of both left and right parking brakes are positioned in parallel with each other,
The two brake wires are connected to the brake operating unit via one wire tension adjusting mechanism, and the operation of the parking brake operating unit causes the two brake wires to be pulled evenly so that the parking brakes of the left and right wheels operate simultaneously. A wire tension adjusting method for a parking brake, comprising: a power tool capable of adjusting the wire tension adjusting mechanism; and a biasing force for biasing a parallel portion of the two brake wires with a constant force in a direction in which a distance between the brake wires increases. Means, detecting means for detecting that a parallel portion of the two brake wires has reached a predetermined interval, and control means for stopping the operation of the power tool based on a detection signal from the detecting means. Characteristic wire tension adjusting device for parking brake. 3. The urging means includes: an extendable main body; a first brake wire engaging portion and a second brake wire provided on the main body, and the distance between the main body and the main body is expanded and contracted as the main body expands and contracts. 3. The wire tension adjusting device for a parking brake according to claim 2, further comprising: a locking portion; a stretching force applying portion that imparts a stretching force to the main body portion; and a control portion that controls the stretching force.