JPH04244759A - Motor with brake - Google Patents

Abstract

PURPOSE:To improve response at the time of starting and braking a motor with a brake. CONSTITUTION:A rotor 2 is secured to a slide rotary shaft 3. A frictional brake 6 is provided. The shaft 3 and the rotor 2 axially move upon energization of a stator 1. A clutch mechanism 11 is interposed between the rotor 2 and the brake 6. When the stator 1 is energized, the mechanism 11 is disengaged, and even if the rotor 2 is rotated, the brake 6 is not rotated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with a brake.

0002

2. Description of the Related Art Conventionally, a motor with a brake as shown in FIG. 4 has been used to drive electric blinds and the like.

That is, when the friction brake 35 is in operation, the rotor 3
The rotor 32, which has its axial center position 33 unevenly located on the brake 35 side and is supported movably along the axis 37 by the resilient member 36, is moved toward the right in the figure (i.e., When the stator 31 is energized, its magnetic force causes the direction indicated by the arrow A to be
The rotor 32 is moved in this direction against the resilient member 36, and the brake 35 is immediately released and activated.

In particular, the brake 35 includes a brake plate 39 fixed to a slide rotating shaft 38 fixed to the rotor 32;
A fixed brake shoe 40 on the casing side, and when the brake 35 is released---during rotation---the brake plate 39 is attached to the slide rotation shaft 3.
Rotates in unison with 8.

[0005]

The conventional motor with a brake having the structure shown in FIG. 4 has the following drawbacks.

[0006] Since the brake plate 39 necessarily rotates together with the rotor 32, the moment of inertia of the rotating part is large and the starting response and braking response are poor. (2) Low responsiveness is particularly noticeable when forward/reverse switching or ON/OFF switching is performed frequently. ■ The dynamic balance of the brake plate 39 must also be taken into account when manufacturing. That is, it becomes difficult to maintain dynamic balance of the rotating part. ■ It is difficult to increase the size of the brake plate 39 in order to improve the brake characteristics --- braking force ---. In other words, if the brake plate 39 is made larger, the above-mentioned response becomes worse.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a clutch mechanism that can be freely connected and disconnected between the friction brake section and the rotor.

[0008]

[Operation] If the clutch mechanism is disconnected when the rotor is rotating, the friction brake section will not rotate.

When braking the rotor, the clutch mechanism is connected, and the braking force of the friction brake section is transmitted to the rotor.
Acts as a brake.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on the illustrated embodiments.

In FIGS. 1 and 2 (FIGS. 1 and 2 only show the main parts of the motor), 1 is a stator,
A rotor 2 is provided inside thereof, and this rotor 2 is fixed to a slide rotation shaft 3. The stator 1 is attached to a casing 7, and constitutes a part of the casing 7 in the embodiment.

The shaft 3 is rotatably supported by the casing 7 via bearings 4 and 5, for example, so as to be able to reciprocate in the axial direction by a predetermined stroke.

Reference numeral 6 denotes a friction brake section, and the brake section 6 includes a fixed shoe 8 fixed to the casing 7 side and a movable shoe 10 on the brake plate 9 side.

Specifically, the brake plate 9 is composed of an annular member fitted around the shaft 3 so as to be rotatable and slidable in the axial direction. ) is equipped with a movable shoe 10. The fixed shoe 8 and the movable shoe 10 have an annular plate shape.

[0015] Thus, a clutch mechanism 11 which can be freely connected and disconnected is interposed between the friction brake section 6 and the rotor 2.

That is, this clutch mechanism 11 includes a first clutch disc portion 15 that is integral with the brake disc 9 by forming a large number of concave and convex teeth 12 on the inner annular surface of the brake disc 9, and further includes: Concave and convex teeth 14 that can mesh with these concave and convex teeth 12...
A second clutch disk 16 having an annular outer end thereof is fixed to the shaft 3 by, for example, a key member.

Of course, the second clutch disc 16 may be constructed integrally with the shaft 3.

A first springing member 17 such as a relatively weak coil spring is interposed between the first clutch disk 15 and the second clutch disk 16, and is always springing in the direction in which the two are separated. It is strong.

Reference numeral 18 denotes a coil spring or the like having a spring constant sufficiently larger than that of the first elastic member 17 and constantly elastically biasing the rotor 2 in the right direction in the figure, that is, in the direction closer to the fixed shoe 8. It is a two-shot member.

Specifically, the spring receiving member 19 near the bearing 4 is interposed between the left end surface of the rotor 2, and the rotor 2, the shaft 3, and the second clutch disc 16 are connected to each other as shown in the figure. Right direction─
──The clutch mechanism 11 is resiliently biased in the direction in which the concave and convex teeth 12 and 14 are in a clutch connected state in which they are mutually engaged.

In the clutch connected state shown in FIG. 1 --- motor stopped/braked state --- the axial center position 21 (magnetic center) of the rotor 2 is lower than the axial center position 20 (magnetic center) of the stator 1. are largely unevenly distributed on the brake part 6 side.

From this state, when the motor switch is turned on and the stator 1 is energized, the rotor 2 is attracted to the stator 1, so the rotor 2 moves along with the shaft 3 and the second clutch disc 16 in the direction of arrow A. Slide───axial movement─
--Then, the axial center positions 20 and 21 approach each other. Along with this, as shown in FIGS. 1 and 2, the engagement between the concave and convex teeth 12 of the first clutch disc part 15 and the concave and convex teeth 14 of the second clutch disc part 16 is released, and the rotor rotates as shown by arrow M. 2, the shaft 3, and the second clutch disc 16 rotate.

At this time, the first resilient member 17 is relatively weak.
The (other) first clutch disc 15 and the brake disc 9 integrated therewith are elastically biased in the direction away from the second clutch disc 16 to ensure that they are separated from the second clutch disc 16 and brought together. It serves to prevent rotation.

Conversely, when the motor is turned off to stop, the magnetic attraction between the rotor 2 and the stator 1 disappears, and the elastic force of the second elastic member 18 immediately returns the motor to the rotating state shown in FIG. The braking state is switched from to the braking state shown in FIG. At this time, since the biasing force of the second resilient member 18 is larger than that of the first resilient member 17, the first resilient member 17 contracts and the uneven teeth 12 of the first clutch disc 15 and the second clutch disc 16 The concavo-convex teeth 14 are engaged with each other.

Next, FIG. 3 shows a specific example in which the configurations of FIGS. 1 and 2 described above are specifically applied.

FIG. 3 shows an elongated motor with a brake suitable for electric blinds, electric curtains, etc.

Approximately the left half of the figure is the drive section 22, and approximately the right half is the deceleration mechanism section 23, and the output shaft 24 connected to the final gear of the deceleration mechanism section 23 has both ends thereof. 24a, 24a are inserted through the casing 7 so as to protrude from both ends of the casing 7.

FIG. 3 shows a case in which the aforementioned slide rotation shaft 3 is a hollow shaft fitted externally to the output shaft 24 so as to be rotatable and slidable.

In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 described above indicate the same structure, so the explanation will be omitted.

It should be noted that other types and structures may be used as the clutch mechanism 11 which can be freely connected and disconnected, and a structure in which the brake plate 9 and the components of the clutch mechanism 11 are separated and connected by a connecting member is also possible. It is also preferable to do so.

[0031]

According to the present invention, with the above-described structure, the moment of inertia of the rotating part centered on the rotor 2 can be reduced, and the responsiveness during frequent forward/reverse switching and ON/OFF switching can be significantly improved. For example, the rise from startup to normal rotation becomes faster, and the braking time becomes shorter.

Furthermore, since the friction brake section 6 is connected only when stopping (braking), the brake section 6 is connected when the rotor is rotating.
There is no need to consider dynamic imbalance of the brake plate 9, etc. Furthermore, since there is no need to consider the unbalance of the brake section 6, it is possible to increase the size of the brake section 6 (so that the braking force is large).

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a rotating state.

FIG. 3 is a sectional view showing a specific application example.

FIG. 4 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

2 Rotor 6 Friction brake part 9 Brake plate 11 Clutch mechanism

Claims (1)

[Claims] 1. A motor with a brake, characterized in that a clutch mechanism that can be freely connected and disconnected is interposed between a friction brake part and a rotor.