JPS6227289B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is such that when the electromagnet is deenergized, the brake spring presses the brake disc against the fixed part via the magnetic pressing member, and when the electromagnet is energized, the pressure is released. This invention relates to improvements to electromagnetic brake devices.

In this type of electromagnetic brake device, the pressing member must be made of magnetic material and is generally made of iron, so when it is activated, the fixed iron core of the electromagnet collides with the pressing member, etc., resulting in high operating noise, that is, high noise. There was a serious inconvenience.

For this reason, conventionally, a first pressing member made of a magnetic metal plate is disposed on the side facing the electromagnet, and the first pressing member is
It has been proposed to configure a pressing member by bonding a second pressing member made of synthetic resin having a different natural frequency from the first pressing member to the side opposite to the electromagnet. Since the member is a non-magnetic material and cannot cooperate with the electromagnet to form a magnetic path, the thickness of the pressing member becomes thicker than before by the thickness of the second pressing member. Not only does the size of the
There have been problems such as cracking of the pressing member, that is, the tendency of the pressing member to be damaged.

This invention was made to solve the above-mentioned conventional drawbacks, and one embodiment of the invention will be described below with reference to FIG. In the figure 1
A spline 1a is formed on the opposite end of the motor shaft to be braked. Reference numeral 2 denotes a fixed member consisting of a cylindrical brake box supported by a motor frame (not shown), and has a circular braking surface 2 on which a brake disc (described later) comes into pressure contact with the inner axis-perpendicular surface of the fixed member.
a, and a pair of slits 2b, 2b (only one of which is shown) formed in the axial direction on the inner circumferential surface of the cylindrical portion. 3 is a ball bearing supported by the fixed part 2 and rotatably supports the motor shaft 1; 4 is the motor shaft 1;
A helical gear engages with the spline 1a on the opposite end of the load side, and 5 is a brake disk, the inner circumference of which fits into the teeth on the outer circumference of the helical gear 4 for free axial movement. 5a, and brake linings 5b disposed on both sides of the disc 5a in the axial direction. 6 has a circular braking surface 6a on the surface facing the brake lining 5b, and protrusions 6b, 6b (only one shown) that loosely fit into the slits 2b, 2b on the outer periphery.
Also, there is a ring hole 6 on the opposite side of the brake disc 5.
c, 6d, and the braking surface 6a touches the brake lining 5 when the brake spring, which will be described later, is activated.
The brake disc 5 is brought into contact with one side of the brake lining 5b in the axial direction, and the other side of the brake lining 5b is brought into contact with the braking surface 2.
This is for pressure contact with a. Reference numeral 7 denotes an adjustment ring fitted into the ring hole 6c. When the brake lining 5b is worn down by a predetermined amount and the braking torque decreases, the adjustment ring 7 falls from the ring hole 6c and is fitted into the ring hole 6d, thereby almost reversing the decrease in braking torque. This is to restore the value. Reference numeral 8 denotes a pressing member consisting of a disk-shaped movable iron core disposed so as to sandwich the adjustment ring 7 with the pressure plate 6 and to be freely movable in the axial direction, and is paired with an electromagnet to be described later. 8A, and magnetic metal plates 8B, 8B, which are thinner than the magnetic rubber plate 8A and are fixed to both sides of the magnetic rubber plate 8A. A brake spring 9 is a compression coil spring that constantly urges the pressure plate 6 toward the brake disc 5 through the pressing member 8 and the adjustment ring 7, and is used to press the braking surfaces 2a and 6a against the brake lining 5b during braking. belongs to. 10 is the brake spring 9
The pressing member 8 is sucked and moved toward itself against the spring pressure of the brake lining 5b and the braking surfaces 2a, 6.
A cylindrical fixed iron core 10A that is detachably connected to the fixed member 2 with an electromagnet that releases the pressure contact with the motor shaft 1 and prevents braking torque from acting on the motor shaft 1.
and an electromagnetic coil 10b that is disposed on the inner circumference of the fixed iron core 10A and magnetizes the fixed iron core 10A when energized.

In the structure configured in this way, the electromagnetic coil 10B is in a de-energized state, that is, the electromagnet 10
In the state shown in the figure when the brake spring 9 is not energized,
The spring pressure causes the brake lining 5b, that is, the brake disc 5, to come into pressure contact with the braking surfaces 2a, 6a and prevent rotation, so that a braking torque acts on the motor shaft 1. Further, when the electromagnet 10 is energized, the electromagnet 10 pushes the pressing member 8 against the brake spring 9.
The braking surface 2 of the brake disk 5 is attracted against the spring pressure of
Since the pressure contact with a and 6a is released, the motor shaft 1 is in a non-braking state in which it can freely rotate. Further, the pressing member 8 collides with the fixed core 10A when the electromagnet 10 is energized, and with the adjustment ring 7 when the electromagnet 10 is de-energized, but the pressing member 8 collides with the magnetic rubber plate 8A and the magnetic rubber plate 8A. Since it is composed of magnetic metal plates 8B and 8B that have different natural frequencies and are fixed to both sides of the magnetic rubber plate, the above-mentioned collision noise is reduced as in the conventional case. Moreover, the entire pressing member 8 can cooperate with the electromagnet 10 to form a magnetic path. Furthermore, the overall thickness of the pressing member 8 can be made thinner than when the pressing member 8 is composed of a single magnetic rubber plate.

Note that the pressing member 8 is not limited to that of the above embodiment, and may be of the type shown in FIGS. 2 and 3. The pressing member 8 shown in FIG. Since the number of laminated plates is small, manufacturing is simple.
In addition, the one shown in FIG. 3 has the magnetic rubber 8A laminated and fixed on both sides of the magnetic metal plate 8B, so it has the advantage that the above-mentioned collision sound, that is, noise, can be significantly reduced compared to the conventional one. .

As described above, the present invention provides an electromagnetic brake in which the brake spring presses the brake disc against the fixed part via the magnetic pressing member when the electromagnet is deenergized, and the pressure is released when the electromagnet is energized. In the device, the pressing member is configured by mutually fixing a magnetic metal plate and a magnetic rubber plate having a different natural frequency from the magnetic metal plate, so that the pressing member does not collide with the mating member during operation. Not only can the generated sound, that is, noise, be made smaller than when the pressing member is made of metal, but also the entire pressing member can work together with an electromagnet to form a magnetic path, making it possible to Compared to a pressing member composed of a single magnetic rubber plate with weak mechanical strength, the plate thickness of the pressing member, and thus the overall dimensions, can be made smaller, and,
Compared to the conventional type, there are effects such as significantly reducing damage to the pressing member due to the collision.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of one embodiment of the invention, and FIGS. 2 and 3 are sectional views of pressing members of other embodiments of the invention. In the figure, 1 is a motor shaft (braked body), 2 is a fixed member, 2a is a braking surface, 5 is a brake disc, 5b is a brake lining, 6 is a pressure plate, 6a is a braking surface, 7 is an adjustment ring, and 8 is a braking surface. The pressing members include a magnetic rubber plate 8A, a magnetic metal plate 8B, a brake spring 9, an electromagnet 10, a fixed iron core 10A, and an electromagnetic coil 10B. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A brake spring presses a brake disk against a fixed part via a magnetic pressing member when the electromagnet is deenergized, and the pressing is released when the electromagnet is energized. An electromagnetic brake device characterized in that the pressing member is constructed by fixing a magnetic metal plate and a magnetic rubber plate to each other. 2. The electromagnetic brake device according to claim 1, characterized in that a magnetic metal plate is opposed to an electromagnet. 3. The electromagnetic brake device according to claim 1, wherein magnetic metal plates are fixed to both sides of the magnetic rubber plate to constitute the pressing member. 4. The electromagnetic brake device according to claim 1, wherein the pressing member is constructed by fixing magnetic rubber plates to both sides of a magnetic metal plate. 5 Claim 1, characterized in that the thickness of the magnetic rubber plate is greater than the thickness of the magnetic metal plate.
3. The electromagnetic brake device according to item 3, item 4, or item 4.