JPS6215551Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a non-excitation control type disc brake, and particularly to a gap adjustment device between a disc and a pair of pads.

A conventional disc brake is shown in FIGS. 1 to 3. In the figure, a pair of pads 10a and 10b are attached to a movable core 5 and a side plate 6 by countersunk screws 11 on both sides of a disk 1. The side plate 6 is arranged to face the movable iron core 5 with the disk 1 in between, and spacing springs 13 are provided at two upper and lower places between the side plate 6 and the movable iron core 5 to maintain the distance between the side plate 6 and the movable iron core 5. . The side plate 6 is prevented from coming off by a nut fitted to the guide rod. The movable core 5 is disposed facing the fixed core 4, and has a rod-shaped convex portion at its center. The fixed core 4 has a coil 7 molded therein, and a torque spring 8 is mounted and arranged in the center so as to repel the movable core 5. Guide rods 12 are attached above and below the fixed core 4, and the movable core 5 and side plates 6 are fitted together. The fixed core 4 is attached to the base 2 via a pin 3 so as to be movable in the thrust direction. A guide nut 9 is fixed to the central opening of the fixed core 4, and a rod-shaped convex portion of the movable core 5 is fitted into the guide nut 9. The tip of this protrusion is the adjustment bolt 14 attached to the base 2.
It is placed opposite.

Figure 2 shows pads 10a and 10b in the brake state.
is pressed against disk 1. This pad 10
a, 10b are pressed against the disk 1 because the movable iron core 5 is first pressed toward the disk 1 by the torque spring 8. Next, in order to press the side plate 6 toward the disk 1, the fixed core 4 is pushed toward the opposite side of the disk 1 by the reaction force of the torque spring 8, and the guide rod 12 fixed to the fixed core 4 is also pressed against the fixed core 4. To perform a similar movement, the side plate 6 is pressed toward the disk 1 via a nut attached to the tip of the guide rod 12. In this way, the side plate 6 is pressed toward the disk 1,
Since the pads 10a and 10b press against the disk 1 from opposite directions, the brake is activated. That is, disk 1 and pads 10a, 10
Friction occurs between the brake and the brake torque, and brake torque is generated.

Figure 3 shows pads 10a and 1 with the brakes released.
A gap is created between disk 0b and disk 1, and the brake is released.

The brake is released by passing a current through the coil 7 and causing the movable iron core 5 to be attracted to the fixed iron core 4 by the electromagnetic force. During braking, when the fixed iron core 4 is at stroke A on the opposite surface of the movable iron core 5, the gap B between the tip of the bar-shaped convex portion of the movable iron core 5 and the adjustment bolt 12 is adjusted to 1/2 of the stroke A. Therefore, the tip of the rod-shaped convex portion of the movable iron core 5 hits the adjustment bolt 14 after moving by 1/2 of the stroke A. When the movable core 5 hits the adjustment bolt 14, the fixed core 4 is now attracted to the movable core 5, and the fixed core 4 moves to the left. Due to this movement, as shown in FIG. 3, the gap between the disk 1 and the pads 10a, 10b becomes C=C' and A=B=0.

However, in reality, the movement of the fixed core 4 tends to move too far to the left in the diagram due to inertia, and the gap does not become C=C', but C>C', and in the worst case
C'=0, which means that the right side pad 10b comes into contact with the disc 1 and there is a drawback that the brake cannot be completely released.

The object of the present invention is to eliminate the above-mentioned drawbacks, eliminate the unbalance of the gap between the disc and the pad, and further eliminate the contact of the right side pad with the disc, thereby providing a disc brake that allows the brake to be released reliably.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 shows an embodiment of the present invention.

The basic structure is the same as that of the conventional type, and the same parts are denoted by the same reference numerals as in FIGS. 1 to 3, and the explanation thereof will be omitted since it has been described above. Therefore, only the particularly different parts will be explained. In other words, fixed core 4 and base 2
Everything is the same as the conventional type except for the addition of a gap adjustment spring 20 between the two.

As shown in FIG. 4, since the base 2 of the gap adjustment spring 20 is fixed, the force constantly pushes the fixed core 4 to the right. The tip of the section moves by B, hits the adjustment bolt 14, and the fixed core 4 starts moving to the left. When it is completely attracted to the movable core 5, the fixed core 4 is moved by the spring force of the gap adjustment spring 20. By absorbing the inertial force of C=
It acts to always maintain the relationship C′. This means that
The gap adjustment spring 20 acts to bring the tip of the rod-shaped convex portion of the movable iron core 5 into contact with the adjustment bolt 14.

Note that the spring force of the spacing spring 13 and the gap adjustment spring 20 is made the same to balance the torque spring 8.
Eliminates the impact on

Therefore, when the brake is released, a balanced gap between the disc and pad can be maintained at all times.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional disc brake, Fig. 2 is a partially longitudinal side view when braking, Fig. 3 is a side view when the brake is released, and Fig. 4 is an embodiment of the present invention. It is a side view at the time of braking shown. 1...Disc, 2...Base, 3...Pin,
4... Fixed iron core, 5... Movable iron core, 6... Side plate,
7... Coil, 8... Torque spring, 9... Guide nut, 10a, 10b... Pad, 11... Flat head screw, 12... Guide rod, 13... Spacing spring, 1
4...Adjustment bolt, 20...Gap adjustment spring.

Claims (1)

[Scope of utility model registration request] A disk integrally attached to the braked shaft, a pair of pads provided across the disk, and the pair of pads are attached to a movable core and a side plate, respectively, and the movable core faces a fixed core. The fixed iron core has a built-in coil, the fixed iron core is movably attached to a base via a pin, and the fixed iron core is urged in a direction opposite to the disk between the fixed iron core and the base. a gap adjustment spring is provided, a torque spring is provided between the fixed iron core and the movable iron core facing each other, and a rod-shaped convex portion at the center of the movable iron core penetrates the center of the fixed iron core;
The tip of this rod-shaped convex portion is arranged so as to face the adjustment bolt attached to the base with a small gap during braking, and a guide rod is attached to the fixed iron core, and through this guide rod, A disc brake of non-excitation control type, characterized in that the side plate is engaged with the fixed iron core so that a spacing between the side plate and the movable iron core is maintained by a spring.