JPH0538262Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a damper that can prevent resonance phenomena occurring in stepping motors and the like.

(Prior art) A stepping motor that can rotate by a predetermined angle each time an input pulse is applied and can obtain a rotational angular velocity proportional to the input pulse frequency can perform highly accurate positioning by simply switching the current. Its greatest advantage is that it can be used in a variety of machines, including printers, plotters, XY tables, robots, and conveyance systems.

By the way, in this type of stepping motor, when the number of input pulses is gradually increased, a so-called resonance phenomenon occurs in which the vibration of the rotor, that is, the motor shaft becomes large at some frequencies in the movable range.

Conventionally, in order to suppress the above-mentioned resonance, a damper that can apply viscosity or frictional resistance to the motor shaft has been used.

A conventional damper will be explained below with reference to FIG. In the figure, 101 is a double-shaft stepping motor, and 102 is a stepping motor 10.
This is a damper attached to one end of the motor shaft 103 of No. 1.

The damper 102 includes a boss 104 fixed to a motor shaft 103 using a screw, a magnet 105 disposed on the outer circumferential surface of the boss 104, and a magnetic fluid disposed to cover the outer surface of the magnet 105. 106
and an inertial body 107 placed on the outer periphery of the magnet 105 via a magnetic fluid 106, and by adding resistance by the magnetic fluid 106 to the rotational movement of the motor shaft 103, a damping effect can be obtained. It's becoming like that.

(Problem that the invention aims to solve) However, in the above-mentioned conventional damper 102, the inertia and resistance values are determined by its specifications such as dimensions and weight, and therefore in actual use, it is often the case that post-processing such as cutting is performed on the inertial body 107 in order to change these values to meet the needs of the user, which has the disadvantage of being unable to meet the various needs of users.

Furthermore, in order to prevent the inertial body 107 from shifting in the axial direction, the inertial body 107 requires complicated processing and assembly, and the unit cost of each part is high and the assembly work is difficult. Therefore, there was a drawback that the damper 102 could not be manufactured at low cost.

The present invention was developed in view of the above circumstances, and its purpose is to provide a damper that can adjust inertia and resistance values, prevent displacement of the inertial body, is easy to assemble, and is inexpensive. It is about providing.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a boss that has a recess perpendicular to the axial direction on the outer peripheral surface and that can be externally fitted onto the motor shaft, and a plurality of annular inertia It is constructed by laminating plates concentrically, and consists of an inertial body placed on the outer periphery of the recess of the boss through an annular gap, and a viscous resistance body filled in the gap between the boss and the inertial body. At least one of the inertia plates constituting the body is formed by dividing it into a plurality of pieces, and on the inner periphery of the divided piece,
A damper is constructed by providing an engaging portion that is loosely fitted into the recess in a laminated state and can overlap the inner wall of the recess in the axial direction via the viscous resistor.

(Function) In the damper according to the present invention, since the inertia body is constructed by laminating a plurality of annular inertia plates concentrically,
By increasing or decreasing the number of laminated inertia plates other than the inertia plate with the engaging portion, the inertia and resistance value of the damper can be arbitrarily and easily adjusted.

In addition, since the engaging portion provided on the inner circumference of at least one inertia plate is loosely fitted into the recess of the boss via the viscous resistor, even if an external force, etc. in the axial direction is applied to the inertia plate, By engaging the engaging portion with the recess via the viscous resistor, displacement of the engaging portion can be prevented.

Furthermore, since the inertia plate provided with the engaging portion is divided into multiple pieces, the engaging portion can be easily set in the recess by combining the divided pieces from the outside of the boss. A series of assembly operations can be easily carried out by simply fitting the inertia plates onto the bosses, stacking them, and filling them with the viscous resistor.

(Embodiment) Figures 1a to 1c show an embodiment of the present invention, in which Figure 1a is a front view of the damper, and Figure 1b is a front view of the damper.
1A is a sectional view taken along the line A-A in FIG. 1A, and FIG. 1C is an exploded perspective view of the damper.

The damper 1 illustrated in the figure includes a boss 10, an inertial body 20, and a viscous resistance body 30 interposed between the two.
It is composed of.

The boss 10 has a cylindrical shape with an inner diameter that can be fitted onto the motor shaft, and a screw insertion hole 11 penetrating toward the center of the shaft is formed at one end of the outer circumferential surface. An annular recess 12 perpendicular to the axial direction is formed at the other end. The width of the recess 12 in the axial direction is larger than the thickness of the engaging portion 22 of the inertia plate 21c, which will be described later.

This boss 10 can be easily and inexpensively obtained by cutting the surface of a metal cylindrical material to form a recess corresponding to the recess 12 and then forming a screw hole corresponding to the screw insertion hole 11. Furthermore, after fitting onto the motor shaft, it can be attached to the motor shaft by fastening a screw into the screw insertion hole 11.

The inertia body 20 is constructed by laminating a total of five annular inertia plates 21a to 21e concentrically together using an adhesive. 4 excluding the central inertia plate 21c
The inner diameter of each of the inertia plates 21a, 21b, 21d, and 21e is larger than the outer diameter of the boss 10. In addition, the central inertia plate 21c is symmetrical with two
The inner circumferential portions of the divided pieces each have an inner diameter smaller than the outer diameter of the boss 10, and the boss 10 is separated when stacked.
A fan-shaped engaging portion 22 (the portion shown by the imaginary line in the drawing) is loosely fitted into the recess 12 of No. 0 and overlaps the inner wall of the recess 12 in the axial direction via the viscous resistor 30.

Each of the inertia plates 21a to 21e constituting the inertia body 20 is made of a material such as resin or metal, and is manufactured by molding, pressing, laser processing, or the like.

The viscous resistor 30 is made of a viscous material such as a silicone gel material, and is arranged to fill an annular gap formed between the inertial body 20 and the vicinity of the recess 12 of the boss 10. It is closely related to each of the 20. In other words, viscous resistance is applied to the boss 10 and the inertial body 20 by the viscous resistance body 30 against mutual movement between the two.

Here, a method for assembling the damper 1 will be explained. First, each divided piece of the inertia plate 21c is attached to the boss 10.
The engaging portion 22 is loosely fitted into the recess 12, and the two divided pieces are joined together using an adhesive. Next, other inertia plates 2 are attached from both sides of this inertia plate 21c.
1a, 21b, 21d, and 21e are fitted onto the boss 10, and these are laminated concentrically using an adhesive. Next, the viscous resistance body 30 is filled and arranged in the annular gap formed between the inertial body 20 and the boss 10.

The damper 1 of this embodiment is used by attaching the boss 10 to the motor shaft of a stepping motor.

When the motor is operated, the boss 10 rotates together with the motor shaft, while the inertial body 20 rotates via the viscous resistor 30. Therefore, viscous resistance is applied to the motor shaft by the viscous resistor 30, and as a result, A damping effect is obtained and resonance is suppressed.

In addition, since the inertia body 20 is constructed by laminating a total of five annular inertia plates 21a to 21e concentrically, the damper can be It is possible to arbitrarily and easily adjust the inertia and resistance value of 1, and it is possible to accurately follow the demands of consumers.

Further, the engaging portion 22 provided on the inner circumference of the central inertia plate 21c is connected to the boss 10 via the viscous resistor 30.
Since the inner wall of the recess 12 overlaps with the inner wall of the recess 12 in the axial direction, even when an external force in the axial direction is applied to the inertial body 20, the engagement between the engaging portion 22 and the recess 12 via the viscous resistor 30 is prevented. As a result, it is possible to reliably prevent its positional displacement and falling off, and to exhibit a stable damping effect.

Furthermore, an inertia plate 21 provided with an engaging portion 22
Since c is divided into two parts, the engaging part 22 can be easily set in the recess 12 by combining both divided pieces from the outside of the boss 10, and then the other inertia plates 21a, 21b, 21d , 21e are fitted onto the boss 10, stacked, and filled with the viscous resistor 30, making it easy to perform a series of assembly operations.

Furthermore, in addition to easy assembly work and no complicated processing required to form the engaging portion 22,
Since parts such as the boss 10 and the inertia plate are inexpensive,
The damper 1 can be manufactured at a lower cost than conventional dampers.

3a to 3c show other embodiments of the present invention, in which FIG. 3a is a front view of the damper, FIG. 3b is a sectional view taken along line B-B in FIG. 3a, and FIG. Figure 3c is an exploded perspective view of the damper.

This embodiment differs from the embodiment shown in FIG. 1 in that all the inertia plates 41a to 41e constituting the inertia body 40 are symmetrically divided into two parts.

In the damper of this embodiment, the divided inertia plate 41
After laminating a to 41e using adhesive,
Since the damper 1 can be assembled by sandwiching the boss 10 and joining the two using adhesive, there is an advantage that the assembly work can be simpler than that of the embodiment shown in FIG. Other actions and effects are the same.

4 and 5 show other embodiments of the engagement structure, respectively.

In the embodiment shown in FIG. 4, the inertia body 50 is composed of a total of six inertia plates 51a to 51f, and the two inertia plates 51c and 51d located in the center are symmetrically divided into two parts. The engagement portions 52 are provided on each inner peripheral portion, and the axial width of the recess 62 of the boss 60 is 2.
This embodiment differs from the embodiment shown in FIG. 1 in that the thickness is greater than that of the two inertia plates 51c and 51d, but the same functions and effects can be achieved.

On the other hand, the embodiment shown in FIG.
This embodiment differs from the embodiment shown in FIG. 1 in that two recesses 82 having an arcuate cross section orthogonal to the axial direction are symmetrically provided on the outer circumferential surface of 0, but the same functions and effects can be achieved.

In each of the above embodiments, an engaging portion is formed on the inner circumference of each divided piece of the inertia plate, but the engaging portion can be used if it is formed on one of the divided pieces. Moreover, the shape is not limited to that shown in the embodiment, and for example, a rectangular protruding piece may be substituted, and the shape of the recess into which the engaging portion is loosely fitted may also be such that the inertial body is not limited to that shown in the embodiment. Various modifications are possible as long as it can engage with the engaging portion when moved in the axial direction.

Furthermore, it goes without saying that the laminated position of the divided inertia plates is not limited to the center of the inertia body, but may also be at the ends, and the inertia plates may be asymmetrically formed or divided into three or more pieces. .

Furthermore, the viscous resistor is not limited to silicone, and other viscous materials such as synthetic rubber may be used.

Furthermore, if the adhesiveness of the viscous resistor is low and there is a risk of slipping in the rotational direction between the inertial body and the viscous resistor or between the boss and the viscous resistor, an adhesive may be used between them. Alternatively, as shown in FIG.
and a viscous resistor 3 on the inner wall surface of the recess 12 of the boss 10.
Mutual slipping may be prevented by providing a plurality of axial through holes 90 or recesses (not shown) in the circumferential direction into which zeros enter.

Furthermore, the means for laminating the inertia plates is not limited to bonding using an adhesive, but may also be fastening with bolts and nuts, various welding by spot or electron beam, diffusion bonding, etc.

(Effect of the invention) As explained above, according to the invention, since the inertia body is constructed by laminating a plurality of annular inertia plates concentrically, other than the inertia plate with the engaging portion By increasing or decreasing the number of laminated inertia plates, the inertia and resistance value of the damper can be arbitrarily and easily adjusted, and the demands of the user can be accurately followed.

In addition, since the engaging portion provided on the inner circumference of at least one inertia plate overlaps the inner wall of the recess of the boss in the axial direction via the viscous resistor, an external force in the axial direction is applied to the inertia plate. Even when the damping member is stuck, the engagement between the engaging portion and the recess through the viscous resistor reliably prevents its positional shift and falling off, and a stable damping effect can be achieved.

Furthermore, since the inertia plate provided with the engaging portion is divided into multiple pieces, the engaging portion can be easily set in the recess by combining the divided pieces from the outside of the boss, and then the other parts can be assembled. A series of assembly operations can be easily carried out by simply fitting the inertia plates onto the bosses, stacking them, and filling them with the viscous resistor.

Furthermore, the assembly work is easy and no complicated machining is required to form the above-mentioned engaging portions, and parts such as bosses and inertia plates are inexpensive, making the damper cheaper than conventional dampers. Can be manufactured.

[Brief explanation of the drawing]

Figures 1a to 1c show an embodiment of the present invention, where Figure 1a is a front view of the damper and Figure 1b is a front view of the damper.
is a sectional view taken along the line A-A in Fig. 1a, Fig. 1c is an exploded perspective view of the damper, Fig. 2 is a sectional view of a conventional damper, and Figs. Fig. 3a is a front view of the damper, Fig. 3b is a sectional view taken along the line B-B of Fig. 3a, Fig. 3c is an exploded perspective view of the damper, and Fig. 4 shows another embodiment. 5 is a front view showing another embodiment of the engagement structure, and FIG. 6 is an enlarged sectional view of essential parts showing the slip prevention structure. In the figure, 1... Damper, 10, 60, 80... Boss, 12, 62, 82... Recess, 20, 40, 5
0,70...Inertial body, 21a to 21e, 41a
41e to 51a to 51f, 71... inertia plate, 22, 42, 52, 72... engaging portion, 30...
...Viscous resistor.

Claims (1)

[Scope of Claim for Utility Model Registration] A boss having a recess perpendicular to the axial direction on the outer peripheral surface and capable of being externally fitted onto the motor shaft, and a plurality of annular inertia plates concentrically laminated, and It consists of an inertial body disposed on the outer periphery of the recess of the boss through an annular gap, and a viscous resistance body disposed filling the gap between the boss and the inertial body, and at least one of the inertial plates constituting the inertial body is connected to a plurality of inertia plates. It is formed by being divided into pieces, and an engaging part is provided on the inner peripheral part of the divided piece, which is loosely fitted into the recess in a laminated state and can overlap the inner wall of the recess in the axial direction via a viscous resistor. Characteristic damper.