JP2004251382A - Rubber cushion for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber cushion for developing sufficient performance of a motor by increasing a spring constant and torsional and twisting rigidity in the peripheral direction of rotation to reduce the deflection and chattering of a shaft while securing original vibration proofing performance. <P>SOLUTION: The rubber cushion 10 for the motor comprises elastic bodies 5 of rubber elastic materials held between a mounting plate 2 of the motor 1 and a mounting plate 4 on the side of a supporting member 3 and insertion holes 6 for a motor output shaft 1A formed in central portions thereof. Radial rigid plates 7 are arranged between both mounting plates 2, 4 at a plurality of places equally spaced around the central insertion holes 6 in the peripheral direction in the state of being alternately laminated on the elastic bodies 5 in the peripheral direction. The rigid plates 7A located every other one in the peripheral direction are fixed and jointed one mounting plate 2 and the remaining rigid plates 7B are fixed and jointed to the other mounting plate 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is directed to transmitting a vibration generated during rotation driving of a motor built in various OA devices to a device frame, as represented by a stepping motor used for a paper feed of a facsimile or a copying machine or a print head of a printer. The present invention relates to an anti-vibration rubber for a motor, which is used for suppressing noise generation due to solid-state propagation of the vibration.
[0002]
[Prior art]
This type of motor anti-vibration rubber is configured such that a motor mounting plate and a mounting plate on a support member side continuous to an equipment frame are opposed to each other in parallel with each other, and an elastic body made of a rubber-like elastic material is interposed between the mounting plates. The structure of being sandwiched is fundamental, and in a vibration-proof rubber for a motor having such a basic structure, conventionally, a plurality of elastic bodies made of rubber-like elastic material are arranged in the circumferential direction, and all or at least a part of them is arranged. It is known that the elastic constant of the vibration isolating rubber is set to be different from each other in one direction in the circumferential direction and in the direction opposite thereto by being formed of an elastic body inclined in one direction in the circumferential direction ( For example, see Patent Document 1).
Further, cylindrical portions are formed in the mounting plates opposed to each other so as to fit inward and outward in the radial direction, and an elastic body made of a rubber-like elastic material is sandwiched between the inner and outer cylindrical portions to set a large spring constant in a direction perpendicular to the axis. This is also conventionally known (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP-A-2001-95191 {FIGS. 1A and 1B}
[Patent Document 2]
JP-A-7-177701 {FIGS. 1 (a) and 1 (b)}
[0004]
[Problems to be solved by the invention]
In the conventional vibration damping rubber for a motor disclosed in Patent Document 1, since the spring constant of the vibration damping rubber is set to be different from each other in one direction in the circumferential direction and in the opposite direction, for example, in a copying machine, When using a stepping motor as a drive source for reciprocating the scanner unit, it is possible to return to the original position as soon as possible while reducing the spring constant on the outward path where reduction of vibration is strongly desired for accurate reading of the original. It is possible to satisfy both different required spring constants in each reciprocating path, such as increasing the spring constant (rigidity) in the desired return path.
[0005]
Further, the conventional anti-vibration rubber for a motor disclosed in Patent Literature 2 has a structure in which an elastic body made of a rubber-like elastic material has a sufficiently large spring constant in an axial direction to reduce a predetermined anti-vibration performance. The spring constant (rigidity) in the perpendicular direction (shear direction) is increased to reduce the displacement of the motor and to improve the positioning accuracy of the motor.
[0006]
However, the conventional anti-vibration rubbers for motors described above are merely devised to increase the spring constant (rigidity) in a specific direction. No consideration is given to torsional rigidity or twist rigidity. In particular, in the case of a vibration-proof rubber in which an elastic body made of a rubber-like elastic material is sandwiched between mounting plates parallel to each other, the characteristics of the elastic body made of the rubber-like elastic material, that is, the shear rigidity is smaller than the compression rigidity. Due to its extremely small characteristics, the spring constant, torsional rigidity, and torsional rigidity in the circumferential direction, which are closely related to the shear rigidity, are naturally small, and therefore, the torsional and torsional forces strongly applied to the output shaft when the motor rotates at high speed. The output shaft is liable to run out of the shaft, and the vibration is likely to cause the entire vibration-isolating rubber to crack and vibrate as a result of such shaft runout. There was a problem that can not be.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and while increasing the spring constant, torsional rigidity, and torsional rigidity in the rotational circumferential direction while reducing the occurrence of shaft shake and chatter while maintaining the original vibration isolation performance, the motor performance has been reduced. It is an object of the present invention to provide a vibration damping rubber for a motor that can sufficiently exhibit the above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the vibration isolating rubber for a motor according to the present invention has an elastic body made of a rubber-like elastic material interposed between a mounting plate of a motor and a mounting plate on a support member side facing each other in parallel. The mounting plate and the elastic body are provided with a through hole for the motor output shaft at the center of the elastic body. Rigid plates are arranged radially so that the elastic members made of the rubber-like elastic material are alternately laminated in the circumferential direction, and among these plural rigid plates, the rigid plates located every other in the circumferential direction are arranged. It is characterized in that one rigid plate is fixedly joined to the other rigid plate on the other rigid plate side.
[0009]
According to the present invention having the above-described configuration, an elastic body made of a rubber-like elastic material having a small spring constant in the axial direction (compression direction) is used, and the compression rigidity of the entire vibration-isolating rubber is reduced, so that the elastic body at the time of motor rotation The elastic body made of rubber-like elastic material and the radial rigid plate are laminated in the circumferential direction while the natural vibration in the compression direction is absorbed and relaxed by the elastic body made of rubber-like elastic material, and the original vibration-proof performance is sufficiently secured. Due to the laminated rubber structure, it is possible to increase the spring constant, the torsional rigidity, and the torsional rigidity in the rotational circumferential direction of the vibration isolating rubber as a whole regardless of the shear rigidity of the elastic body itself. In addition, the output shaft is fully opposed to the torsional and twisting forces that are strongly applied to the output shaft during high-speed rotation of the motor, thereby significantly reducing the occurrence of shaft vibration of the output shaft and the occurrence of cracks in the vibration-isolating rubber due to such shaft vibration. Then mo It is possible to sufficiently exhibit the performance.
[0010]
In the anti-vibration rubber for a motor having the above configuration, the free end of the non-fixed joint opposite to the end fixedly joined to one of the plurality of radial rigid plates and the other mounting plate is opposed thereto. Even if it is in close contact with the other and one of the mounting plates, a gap is formed between the free end side and the other and one of the mounting plates opposed thereto, and the rubber-like elastic material May be interposed. Among them, in the former case, the elastic body made of rubber-like elastic material is completely divided into a plurality in the circumferential direction due to the presence of the rigid body plate, and the spring constant, the torsional rigidity, and the torsional rigidity in the rotational circumferential direction can be further increased. On the other hand, in the case of the latter, it is possible to increase the spring constant and the torsional rigidity in the rotational circumferential direction and the torsional rigidity while reducing the compression rigidity as compared with the former, and both of these configurations are: It is desirable that the motor be selectively adopted according to the size and performance of the motor.
[0011]
Further, in the motor vibration isolating rubber having the above configuration, the plurality of radial rigid plates are desirably arranged at regular intervals in the circumferential direction, but may be arranged at irregular intervals in the circumferential direction. .
[0012]
Further, in the vibration isolating rubber for a motor having the above-described configuration, the plurality of radial rigid plates are provided in the radial direction of the elastic member made of a rubber-like elastic material in order to increase the rate of increase in the spring constant and the torsional rigidity and the torsional rigidity in the rotational circumferential direction. Although it may be arranged so as to traverse the entire thickness, the ratio of the spring constant in the compression direction, the compression rigidity to the spring constant in the circumferential direction of rotation and the torsional rigidity, the torsional rigidity depends on the size and performance of the motor. It is preferable that the elastic member is arranged only on a part of the radial thickness of the elastic member so that the elastic member can be adjusted to an appropriate value.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a first embodiment of a vibration damping rubber for a motor according to the present invention, FIG. 2 is a cross-sectional view taken along line AOB of FIG. 1, and FIG. 3 is AOC of FIG. FIG. 4 is a cross-sectional view taken along a line. The motor vibration isolating rubber 10 of the first embodiment is made of a sheet metal such as a steel plate having a mounting flange portion 2f capable of tightening and fixing a high-speed rotation motor 1 (see FIG. 4) such as a stepping motor. And a substantially rhombus-shaped mounting plate 4 made of sheet metal such as a steel plate having a mounting flange portion 4f that can be fastened and fixed to a support member 3 (see FIG. 4) which is a constituent member of the device frame. A circular elastic body 5 made of a rubber-like elastic material is integrally sandwiched between the two mounting plates 2 and 4 by vulcanization bonding. A hole 6 through which the motor output shaft 1A is inserted coaxially passes through the center of the body 5. It is formed.
[0014]
In the rubber anti-vibration rubber 10 for a motor having the basic configuration as described above, a plurality of mounting plates around the center insertion hole 6, specifically, eight mounting plates at equal intervals in the circumferential direction at a central angle of 45 °. Between the 2 and 4, the rigid plates 7 each having a rectangular cross section are radially arranged so as to be alternately laminated with the elastic members 5 made of rubber-like elastic material in the circumferential direction. It is arranged so as to cross the entire area of t.
[0015]
Out of the eight rigid plates 7, four rigid plates 7A, which are located every other in the circumferential direction, are fixedly joined to one of the mounting plates 2 at the end sides, and the remaining four rigid plates are provided. An end 7B is fixedly joined to the other mounting plate 4 side at the end side, and faces the non-joined fixed free end side 7a of the four rigid plates 7A fixedly joined to the one mounting plate 2 side. Between the other mounting plate 4 and between the non-bonded and fixed free ends 7b of the four rigid plates 7B fixedly bonded to the other mounting plate 4 side and one of the mounting plates 2 opposed thereto. Are provided with gaps, and thin elastic portions 5a are interposed in these gaps so as to be integrally connected to the elastic body 5 made of rubber-like elastic material.
[0016]
4, the motor output shaft 1A is inserted into the insertion hole 6 by screwing the screw 8 into the flange portion 2f of the one mounting plate 2, as shown in FIG. In this state, the motor 1 is fastened and fixed to the mounting plate 2, while the screw 9 is screwed into the supporting member 3 from the flange portion 4f side of the other mounting plate 4 to tighten and fix the mounting plate 4 to the supporting member 3. Can be The natural vibration in the axial direction (compression direction) during rotation of the motor 1 in such a mounted state is absorbed and reduced by the elastic body 5 made of rubber-like elastic material, and the original vibration-proof performance of the vibration-proof rubber is sufficiently exhibited. The vibration of the support member 3 and the generation of noise due to the solid propagation of the vibration are suppressed.
[0017]
Further, at this time, a laminated rubber structure in which the rubber-like elastic material 5 and the radial rigid plates 7A and 7B fixedly joined to the mounting plates 2 and 4 are alternately laminated in the circumferential direction is adopted. In addition, irrespective of the shear rigidity of the elastic body 5 itself, it is possible to increase the spring constant, torsional rigidity, and torsional rigidity of the vibration isolating rubber 10 as a whole in the rotational circumferential direction. By sufficiently opposing torsional and torsional forces strongly applied to the output shaft 1A during rotation, it is possible to significantly reduce the occurrence of shaft vibration of the output shaft and the occurrence of cracking vibration of the vibration isolating rubber 10 due to such shaft vibration. As shown by (1) in FIG. 10, the motor performance can be sufficiently exhibited, for example, when the torque output sharply rises with a slight angular displacement.
[0018]
In the first embodiment, the rigid plate 7A is fixedly joined to the non-joined free end 7a of the four rigid plates 7A and the other mounting plate 4 facing the same and to the other mounting plate 4 side. A state in which the four rigid plates 7B are integrally connected to the elastic body 5 made of a rubber-like elastic material in a gap formed between the non-joined free end side 7b of the four rigid plates 7B and one of the mounting plates 2 opposed thereto. The thin elastic body portion 5a is interposed, and the thickness of the thin elastic body portion 5a is appropriately adjusted according to the size and performance of the motor 1, so that the compression rigidity is reduced and the original vibration damping performance is improved. , While increasing the spring constant, torsional rigidity, and torsional rigidity in the rotational circumferential direction to improve motor performance by reducing shaft shake and the like, but is not limited thereto. The free ends 7a, 7b of the rigid plates 7A, 7B which are not joined and fixed The elastic body 5 made of a rubber-like elastic material may be completely divided into eight in the circumferential direction by being in close contact with the mounting plates 4 and 2 which face each other. In this case, the spring constant and the torsional rigidity in the rotating circumferential direction, Motor performance can be further improved by increasing the torsional rigidity to increase the effect of preventing shaft shake and the like.
[0019]
FIG. 5 is a front view showing a second embodiment of the vibration isolating rubber for a motor according to the present invention, FIG. 6 is a sectional view taken along the line AOC of FIG. 5, and FIG. FIG. 9 is a cross-sectional view taken along a line. The motor anti-vibration rubber 10 of the second embodiment includes eight mounting plates 2 at equal intervals in the circumferential direction at 45 ° center angles around the central insertion hole 6. , 4 are arranged radially in such a manner that the rigid plates 7 each having a rectangular cross section traverse only a radially outer portion 5B substantially half the radial thickness t of the elastic body 5 made of rubber-like elastic material. Due to the arrangement of the radial rigid plates 7, the elastic body 5 made of rubber-like elastic material is divided into an annular inner elastic body portion 5A around the center insertion hole 6 and eight in the circumferential direction, and each is divided in the circumferential direction. The rigid plate 7 is divided into a partially circular arc-shaped outer elastic body portion 5B which is alternately laminated.
[0020]
Of the eight rigid plates 7, four rigid plates 7A, which are located every other in the circumferential direction, are fixedly joined to one of the mounting plates 4 at the end sides, and the remaining four rigid plates are provided. 7B is a non-joined free end 7a of the four rigid plates 7A fixedly joined to the other mounting plate 4 side at the end side and fixedly joined to the one mounting plate 4 side, and the other mounting plate. A part of the thin elastic part 5b and a part of the inner elastic part 5A connected to the outer elastic part 5B are respectively adhered to the non-joined free ends 7b of the four rigid plates 7B fixedly joined to the two sides, and Small gaps 11 and 12 are formed between the entire area of both sides in the thickness direction of the elastic body 5 made of rubber-like elastic material and the two mounting plates 4 and 2 facing them, and the other configuration is the first embodiment. Therefore, the corresponding portions are denoted by the same reference numerals and description thereof is omitted.
[0021]
In the rubber anti-vibration rubber 10 for the motor according to the second embodiment, minute gaps 11 and 12 are formed between the entire area in the thickness direction of the inner elastic body portion 5A and the two mounting plates 4 and 2 opposed thereto. However, as in the third embodiment shown in FIGS. 8 and 9, the entire surface of the inner elastic body portion 5A is adhered to the mounting plates 2 and 4, and one side of the inner elastic body 5A in the thickness direction. Only the gap 11 may be formed.
[0022]
In each of the above-described rubber anti-vibration rubbers 10 of the second and third embodiments, the compression stiffness is made smaller than that of the rubber anti-vibration rubber 10 of the first embodiment, thereby realizing the original vibration-isolating performance of the rubber anti-vibration rubber. Irrespective of the shear stiffness of the elastic body 5 itself, while increasing the spring constant, torsional stiffness, and torsional stiffness of the vibration isolating rubber 10 as a whole, and increasing the torsional stiffness at the time of high-speed rotation of the motor 1. In this case, it is possible to reduce the occurrence of the shaft vibration of the output shaft 1A and the occurrence of the crack vibration of the entire vibration-isolating rubber 10 due to such shaft vibration. In particular, in the case of the anti-vibration rubber 10 for motors of the second and third embodiments, the linear region of the spring constant in the rotational circumferential direction can be set in a wide range, and as shown in (2) of FIG. By adjusting the rise of the torque output with respect to the angular displacement, the motor performance can always be sufficiently exhibited in the entire rotation range of the motor 1.
[0023]
In the above embodiments, the radial rigid plates 7 are arranged at regular intervals in the circumferential direction. However, the radial rigid plates 7 are arranged at irregular intervals in the circumferential direction. Is also good.
[0024]
In addition, the present invention is effective as a light and small anti-vibration rubber for a stepping motor, but is not limited thereto.
[0025]
【The invention's effect】
As described above, according to the present invention, an elastic body having a laminated structure in which elastic bodies made of a rubber-like elastic material and radial rigid boards are alternately laminated in the circumferential direction is interposed between mounting plates that are parallel to each other. By using an elastic body having a small spring constant in the axial direction (compression direction), the compression rigidity of the whole vibration-isolating rubber is reduced, and the natural vibration in the compression direction when the motor rotates is made of rubber-like elastic material. Enhance the spring constant, torsional rigidity, and torsional rigidity in the circumferential direction of the vibration isolating rubber as a whole, irrespective of the shear rigidity of the elastic body itself, while ensuring the original vibration isolating performance of absorbing and relaxing sufficiently. Therefore, the torsional force and the torsional force that are strongly applied to the output shaft during high-speed rotation of the motor can be sufficiently counteracted to reduce the shaft vibration of the output shaft and the vibration of the entire vibration-isolating rubber caused by such shaft vibration. Significantly low outbreak And there is an effect that it is possible to always sufficiently exhibit the motor performance.
[0026]
In particular, by adopting the configuration as claimed in claim 3 or claim 3 and claim 7, the compression stiffness is reduced and the original vibration isolating performance is improved, but the spring constant and the torsional stiffness in the rotational circumferential direction, the twist It is possible to increase the rigidity, or to adjust the spring constant and torsional rigidity in the circumferential direction of rotation and the ratio between the torsional rigidity and the compressive rigidity to appropriate values according to the size and performance of the motor. Regardless of the size and performance of the motor, the maximum motor performance can always be exhibited.
[Brief description of the drawings]
FIG. 1 is a front view showing a first embodiment of a vibration damping rubber for a motor according to the present invention.
FIG. 2 is a sectional view taken along line AOB of FIG.
FIG. 3 is a sectional view taken along line AOC of FIG. 1;
FIG. 4 is a cross-sectional view showing a state in which the motor is mounted on a support member using the motor vibration isolating rubber of the first embodiment.
FIG. 5 is a front view showing a second embodiment of a vibration damping rubber for a motor according to the present invention.
FIG. 6 is a sectional view taken along the line AOC in FIG. 5;
FIG. 7 is a sectional view taken along the line BOD of FIG. 5;
FIG. 8 is a cross-sectional view of a third embodiment of the vibration-isolating rubber for a motor according to the present invention, taken along a portion corresponding to the line AOC in FIG.
FIG. 9 is a cross-sectional view of the third embodiment, taken along a line corresponding to line BOD in FIG. 5;
FIG. 10 is a graph showing a rise characteristic of a torque output with respect to an angular displacement in the first embodiment and the second and third embodiments according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 motor 1A motor output shafts 2, 4 mounting plate 3 support member 5 elastic body 5a made of rubber-like elastic material 5a thin elastic body portion 6 central insertion holes 7, 7A, 7B radial rigid plates 7a, 7b free end side 10 anti-vibration for motor Rubber

Claims (7)

An elastic body made of rubber-like elastic material is sandwiched between a mounting plate of the motor and a mounting plate on the support member side opposed to each other in parallel with each other. In the vibration isolating rubber for a motor in which the insertion hole of the output shaft is formed,
Rigid plates are radially arranged between the mounting plates at a plurality of locations around the insertion hole so that the rigid plates are alternately stacked in the circumferential direction with the elastic body made of rubber-like elastic material. An anti-vibration rubber for a motor, wherein rigid plates located every other in the circumferential direction are fixedly joined to one mounting plate side, and the remaining rigid plates are fixedly joined to the other mounting plate side. The free end of the non-fixed joint opposite to the end fixedly joined to one and the other attachment plates of the plurality of radial rigid plates is closely contacted with the other and one attachment plate opposed thereto. The anti-vibration rubber for a motor according to claim 1. Between the free end of the non-fixed joint opposite to the end fixedly joined to one and the other attachment plates of the plurality of radial rigid plates and the other and one attachment plate facing the same. 2. The vibration damping rubber for a motor according to claim 1, wherein a gap is formed, and a part of the elastic body made of the rubber-like elastic material is interposed in the gap. The anti-vibration rubber for a motor according to any one of claims 1 to 3, wherein the plurality of radial rigid plates are arranged at regular intervals in a circumferential direction. The rubber vibration insulator according to any one of claims 1 to 3, wherein the plurality of radial rigid plates are arranged at irregular intervals in a circumferential direction. 6. The anti-vibration rubber for a motor according to claim 1, wherein the plurality of radial rigid plates are arranged so as to traverse the entire radial thickness of the elastic body. The rubber vibration insulator according to any one of claims 1 to 5, wherein the plurality of radial rigid plates are disposed only in a part of a radial thickness of the elastic body.

Images