JPH089589A - Motor provided with brake - Google Patents

Abstract

PURPOSE:To prevent the collision sound between spline projections which occur at torque ripple by the gap between the spline projections. CONSTITUTION:This motor provided with a brake is equipped with a magnet device 14 which forms a magnetic flux phi between a brake plate 5 and a fixed magnetic body such as a bracket 3, etc., and magnetic attraction in opposite direction from the direction of revolution is made to work on the brake plate 5. Moreover, the spline projection is provided with a slit, and the tip is opened with a wedge pin so as to bring adjacent spline projections into contact with each other and unit the hub 4 and the brake plate 5. Moreover, it will do to couple the hub 4 and the brake plate 5 with each other by a tension spring or a plate spring, and weld the space to one side to make it retain the hub and the brake plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake motor equipped with a non-excitation electromagnetic brake.

[0002]

2. Description of the Related Art As shown in FIG. 7, a motor with a brake has a brake plate 5 on an anti-load side of a rotary shaft 1 via an engaging device 6 which can slide in the axial direction like a key or a spline.
Is attached. An electromagnetic device 8 supported by a support plate 9 mounted via studs on the outside of the brake plate 5.
As shown in the upper half of FIG. 7, the armature 10 of the electromagnetic device 8 is pressed against the brake plate 5 side by the brake spring 11, so that the brake plate 5 is liner 12.
The rotating shaft 1 is braked by pressing it against the braking surface 7 of the bracket 3 via 13.

When releasing the brake, the armature 10 is attracted by exciting the coil of the electromagnetic device 8 as shown in the lower half of FIG. 7, and the brake plate 5 is separated from the braking surface 7 so that the brake plate 5 is released. To be able to rotate together with the rotary shaft 1. In addition, the engagement device 6 by the spline is shown in FIG.
As shown in FIG. 5, the axial spline projections 41 provided on the hub 4 fixed to the rotary shaft 1 and the same number of spline projections 51 formed in the fitting holes of the brake plate 5 are fitted together.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the engaging device 6
When the spline projections 41 and 51 are fitted to each other, a gap g is formed in the fitting portion as shown in FIG. 8 due to the working accuracy of the spline projections.
On the front side in the rotation direction, the spline protrusion 51 of the brake plate is pushed to rotate the brake plate. Therefore, a large gap is formed on the rear surface of the spline protrusion 41 of the hub 4.

Therefore, when there is a gap in the front surface of the spline projection 41, when the vehicle is suddenly accelerated, the front surface of the spline 41 collides with the spline 51 of the brake plate 5,
When decelerating, the front surface of the spline protrusion 51 collides with the spline protrusion 41 of the hub 4 due to the inertia of the brake plate 5. However, the rotation of the motor includes a high-frequency component n on the sine wave due to switching noise as in the current waveform shown in FIG. 9, which causes a non-uniform rotation N due to the cogging torque in the torque characteristic of the motor, resulting in an abrupt change. By acceleration and deceleration, the collisions of the spline protrusions are repeated to generate noise (collision noise of the spline protrusions). An object of the present invention is to eliminate the generation of noise due to the collision between the hub and the brake plate that occurs during the operation.

[0006]

For this reason, the engaging portion between the spline protrusion of the hub and the spline protrusion of the brake plate attached to the rotary shaft is constantly pressed and held to the extent that the brake plate can slide in its operating direction. A magnetic device is provided on one or both of the brake plate made of a magnetic material and the fixed part made of a magnetic material facing the brake plate to form a magnetic path between the brake plate and the fixed part. , A suction force is applied to the brake plate in a direction opposite to the rotation direction.

Further, at least one of the spline projections provided on one of the hub and the brake plate is provided with a radial slit opening at the tip of the projection, and a wedge pin is press-fitted into this slit to expand the opening of the slit. The spline projections provided with the slits are opened, and both side surfaces of the spline projections are tightly engaged with the other adjacent spline projections to such an extent that the brake plate can slide in the operating direction.

Further, a tension spring or a leaf spring stretched between the hub and the brake plate is provided so that the brake plate can slide in the operating direction between the spline protrusions of the hub and the brake plate by the spring force of the spring. The spline protrusions can be pressed against each other.

[0009]

Therefore, even if the rotation unevenness occurs during operation, since the brake plate and the fixed portion are held in pressure contact with each other, there is no collision due to the gap and no collision noise is generated. That is, a magnetic device forms a magnetic path between the brake plate and the fixed portion, and the magnetic attraction force acts in a direction to prevent the brake plate from rotating, so that the hub and the brake plate are pressed against each other, and the spline protrusion The provided slits and wedge pins spread the projections to keep them in close contact with the adjacent spline projections, or the spring force of the spring keeps the brake plate and hub in contact with each other, so the spline between the hub and brake plate is maintained. The projections are always kept in an integrated state even during operation, and even if uneven rotation occurs, the spline projections do not collide with each other due to the gap between the hub and the brake plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 is a rotating shaft, 2 is an outer frame, 3 is a bracket on the side opposite to the load made of a magnetic material, 4 is a hub fixed to the rotating shaft 1 outside the bracket 3, and 5 is supported by the hub 4 via an engaging device 6. Brake plate, 7 is bracket 3
Braking surface, 8 is an electromagnetic device provided on a support plate 9 attached to the bracket 3 via studs, 10 is its armature, 11 is a brake spring for pressing the brake plate 5 via the armature 10, and 12 and 13 are liners. Is. The engagement device 6 has spline projections 41 and 51 axially provided in plurality (eight in the illustrated embodiment) provided on the outer circumference of the hub 4 and the fitting hole of the brake plate 5, respectively. g is a fitting gap. Reference numeral 14 is a magnet device attached to the side surface of the brake plate 5, for example, a permanent magnet, which is opposed to the bracket 3 made of a magnetic material via a gap.

When the electromagnetic device 8 is in the non-excited state, the armature 10 is pressed against the brake plate 5 by the brake spring 11 via the liner 12, and the brake plate 5 is lined by the liner 1.
At 3, the rotary shaft 1 is braked by being pressed against the braking surface 7. When the electromagnetic device 8 is excited when the motor is started, the armature 10 is attracted against the brake spring 11, the brake plate 5 is separated from the braking surface 7, the braking of the rotary shaft 1 is released, and the rotary shaft 1 is braked. 2 is rotated together with the plate 5 in the direction of the arrow in FIG. 2, but a magnetic flux φ is formed between the brake plate 5 and the bracket 3 by the magnet device 14 attached to the side surface of the brake plate 5, for example, a permanent magnet, and the brake plate 5 rotates. Generate a magnetic attraction force in the direction of blocking the rotation of the brake plate 5 in accordance with the magnetic flux φ, and the spline protrusion 51 of the brake plate 5
Is compressed and held on the front surface of the spline protrusion 41 of the hub 4 as shown in FIG.

Therefore, even if the rotation of the rotary shaft 1 is uneven, the magnetic attraction force prevents the brake plate 5 from rotating due to inertia, and prevents the collision with the hub 4. Further, since the spline projection 51 of the brake plate is always in contact with the front surface of the spline projection 41 of the hub 4, and there is no gap between the spline projection 41 and the spline projection 51 even when accelerated, they do not collide with each other. No sound is generated.

The mounting position of the permanent magnets constituting the magnet device 14 is not limited to the bracket side of the brake plate 5 as in the above-mentioned embodiment, but a fixed portion surrounding the outer periphery of the brake plate, for example, a cover made of a magnetic material. If there is such a problem, it can be attached to the outer circumference of the brake plate, or may be attached to the surface on the armature side. Also, the brake plate 5
If is a magnetic substance, the magnet device 14 can be provided in the fixed portion, and in this case, an electromagnet can be used for the magnet device. If the brake plate 5 is directly attracted to the electromagnetic device 8 without the armature 10, the electromagnetic device 8
And the magnet device 14 can be used together.

The brake plate 5 is, as shown in FIG.
A spring bearing 15 is provided on the braking surface side of the hub 4, and a weak return spring 16 is provided between the spring bearing 15 and the brake plate so as to separate the brake plate 5 from the braking surface when releasing the brake. The stopper 17 is provided on the 8 side so that the brake plate 5 can be moved by the attraction force of the electromagnetic device.
It is advisable to hold it so that it does not come into contact with.

FIG. 4 shows an essential part of the second embodiment, in which the spline projection 4 of the hub 4 attached to the rotary shaft 1 is shown.
1. The spline projection 51 of the brake plate 5 that engages with the spline 1 has a radial slit 1 that opens at the tip of the spline projection 51.
8 is provided, the wedge pin 19 is inserted into the slit 18 to expand the slit, and the tip end portions of the spline protrusions 51 are opened to both sides. Part of both sides of the opened spline protrusion 51 is a spline protrusion of the adjacent hub 4. 41 is pressed by elasticity by a slit to eliminate the gap g in this portion and integrate them. The wedge pin 19 is adjusted so that the pressure contact portion of the spline protrusion can slide in the operating direction when the brake plate 5 is operated by the electromagnetic device 8 or the brake spring 11.

The slit 18 and the wedge pin 19 are
It is not necessary to provide it on all the spline protrusions 51, but it is sufficient to provide it on at least one.
It is preferable to provide four to four. Also, the slit 18
The wedge pin 19 may be provided on the spline protrusion 41 of the hub 4, but since the brake plate 5 has a smaller thickness than the hub 4, it is desirable to provide it on the spline protrusion 51 of the brake plate.

FIG. 5 shows a third embodiment, in which the spring receiving pins 21 and 22 are attached to the side surfaces of the hub 4 and the bracket 5, respectively, and an appropriate angle from the radial direction (close to the right angle to the radial direction of the spline projection). Tension spring 23 tilted at
Is stretched to connect the hub 4 and the brake plate 5. Note that the tension spring 23 should be pulled in the same direction by 2-4.
It is preferable to install two (two in the figure), and the brake plates 5 are fixed to the spring receiving pins 21 and 22 so that the spring does not come off even if the brake plate 5 slides in the axial direction by the operation. Therefore, the hub 4
The gap g between the spline protrusions 41 and 51 of the brake plate 5 and the brake plate 5 is constantly pressed and held in a biased manner in the pulling direction of the tension spring 23 to prevent a collision during operation and prevent a collision noise from being generated.

FIG. 6 shows a leaf spring 2 instead of the tension spring 23.
In the fourth embodiment in which No. 4 is provided, the hub 4 attached to the rotary shaft 1 is provided with the spring mounting pin 25, the brake plate 5 is provided with the spring receiving pin 26, and one end is fixed to the spring mounting pin 24. The other end of the plate spring 24 is stretched so as to press the spring receiving pin 26 of the brake plate 5. It should be noted that the spring receiving pin 26 is moved by the movement of the brake plate 5 so that the plate spring 2
It is desirable to provide a plurality of leaf springs so that the spring force is in the same direction, and four leaf springs are provided in the figure. Therefore, the spring force of the leaf spring 24 acts in the same manner as in the case of FIG. 5 to prevent the collision noise.

[0019]

As described above, the present invention is provided with the magnet device which forms the magnetic flux between the brake plate and the fixed portion to apply the attraction force in the direction opposite to the rotating direction to the brake plate,
The suction force acting on the brake plate during operation presses the spline protrusions of the engagement device to eliminate the gap, and by adding a simple device, the spline protrusion can be prevented from colliding even if uneven rotation occurs, and the collision noise It is effective in preventing noise caused by the noise. By using a permanent magnet as the magnet device, there is an advantage that the processing is easy and the structure is simple.

Further, at least one of the spline projections provided on the hub and the brake plate is provided with a radial slit which opens at the tip of the spline projection, and a wedge pin is inserted into this slit so that a part of the spline projections are adjacent to each other. It is possible to prevent the collision noise from being generated by bringing the protrusion into contact with the protrusion or by making the gap small so as not to generate the collision noise.

Further, when a tension spring or a leaf spring is stretched between the hub and the brake plate and the spline protrusion of the hub and the spline protrusion of the brake plate are pressed against each other by the spring force, when uneven rotation occurs, Also holds the hub and brake plate in an integrated pressure contact state to prevent collision,
Even when the torque due to the uneven rotation is larger than the spring force of the spring, the effect of limiting the movement of the hub or the brake plate to soften the collision and preventing the generation of the collision noise can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention, in which an upper half portion shows a braking state and a lower half portion shows a released state.

2 is a cross-sectional view of the engagement device taken along the line AA of FIG.

FIG. 3 is a side view showing another structure of a hub holding a brake plate.

FIG. 4 is a side sectional view of an essential part showing a second embodiment.

FIG. 5 is a side view of an essential part showing a third embodiment.

FIG. 6 is a side view of an essential part showing a fourth embodiment.

FIG. 7 is a side sectional view showing a conventional example, in which an upper half portion shows a braking state and a lower half portion shows a state where the braking is released.

8 is a sectional view of the engagement device in FIG.

FIG. 9 is a characteristic curve diagram showing an example of a current waveform and torque during operation of the motor.

[Explanation of symbols]

1 Rotating Shaft 2 Outer Frame 3 Bracket 4 Hub 5 Brake Plate 6 Engaging Device 7 Braking Surface 8 Electromagnetic Device 10 Armature 11 Brake Spring 14 Magnet Device 18 Slit 19 Wedge Pin 21, 22 Spring Bearing Pin 23 Tension Spring 24 Leaf Spring 25 Spring Mounting pin 26 Spring receiving pin 41, 51 Spline protrusion

Claims (4)

[Claims] 1. A hub mounted on the counter-load side of a rotating shaft,
A non-excitation electromagnetic brake motor including a brake plate that engages with the hub by a spline projection, a brake spring that presses the brake plate against a braking surface, and an electromagnetic device that attracts the brake plate to release braking. A motor with a brake, characterized in that a magnetic device is provided between the plate and a fixed portion to form a magnetic flux so as to exert an attractive force in a direction opposite to a rotating direction on the brake plate. 2. The motor with a brake according to claim 1, wherein the magnet device is a permanent magnet mounted on a brake plate so as to face the magnetic body of the fixed portion. 3. A hub mounted on the anti-load side of the rotating shaft,
A non-excitation electromagnetic brake motor comprising: a brake plate that engages with the hub by a spline projection; a brake spring that presses the brake plate against a braking surface; and an electromagnetic device that attracts the brake plate to release braking, At least one of the spline projections provided on the brake plate and the brake plate is provided with a radial slit that opens at the tip of the spline projection and a wedge pin that expands this slit. A motor with a brake, characterized in that the spline protrusions of (1) are brought into contact with the adjacent spline protrusions to such an extent that the brake plate can slide in the operating direction. 4. A hub mounted on the counter-load side of the rotating shaft,
A non-excitation electromagnetic brake motor comprising: a brake plate that engages with the hub by a spline projection; a brake spring that presses the brake plate against a braking surface; and an electromagnetic device that attracts the brake plate to release braking, A tensioned spring is provided between the brake plate and the brake plate, and the spline projection of the hub and the spline projection of the brake plate are pressed against each other by the spring force of the spring so that the brake plate can slide in the operating direction. Motor with brake.