JP3717338B2 - Rotating electric machine fixing structure and anti-vibration coupling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for fixing a rotating electric machine such as a motor, and more particularly to a structure for fixing a rotating electric machine using a vibration isolating connector for absorbing vibration generated from the rotating electric machine.
[0002]
[Prior art]
In FIG. 3 of Japanese Utility Model Laid-Open No. 3-74167, design registration No. 843519, design registration No. 864952, design registration No. 848433, etc., an elastic body is provided between the first and second mounting flange plates. The structure of a conventional anti-vibration connector with the position of is shown. In the conventional anti-vibration connector, the first and second mounting flange plates each project at the center portion with an annular facing portion having a large through-hole through which the rotation shaft passes, and to the outside of the facing portion, and the mounting hole And a plurality of mounting portions. The first mounting flange plate is fixed by inserting a screw into a mounting hole provided in the mounting portion with respect to the rotating electrical machine such as a motor, and the second mounting flange plate is a device for mounting the rotating electrical machine. It is fixed to the frame or case using screws.
[0003]
[Problems to be solved by the invention]
Such an anti-vibration coupler is often shipped in a state where the mounting hole provided in the first mounting flange plate is mounted on the rotating electrical machine in accordance with the screw hole formed on the end bracket or the like of the rotating electrical machine. . However, in the conventional structure, it takes time to align the mounting hole provided in the first mounting flange plate and the screw hole on the rotating electric machine side, and the positioning work of the vibration isolating connector relative to the rotating electric machine is troublesome. There was a problem that took time to work.
[0004]
The objective of this invention is providing the fixing structure of the rotary electric machine with which positioning of the vibration isolator coupling tool with respect to a rotary electric machine is easy.
[0005]
Another object of the present invention is to provide an anti-vibration connector suitable for achieving the above object.
[0006]
[Means for Solving the Problems]
In the rotating electrical machine fixing structure of the present invention, the first mounting flange plate attached to the end of the rotating electrical machine on the side from which the rotating shaft projects, and the second mounting for mounting to the fixed part for fixing the rotating electrical machine. An anti-vibration connector comprising a flange plate and an annular elastic body disposed between the first and second mounting flange plates in a state of being joined to both is used. The first and second mounting flange plates constituting the anti-vibration coupler have an annular facing portion provided with a through-hole through which the rotation shaft penetrates in the center portion, and projecting outside the facing portion and mounting holes respectively. The first and second mountings are provided so that the plurality of mounting portions of the first mounting flange plate and the plurality of mounting portions of the second mounting flange plate do not face each other. The opposing portions of the flange plate for use are opposed to each other with an elastic body interposed therebetween. In this invention, a rotary electric machine is fixed to a to-be-fixed part using this anti-vibration coupling tool. Therefore, in the present invention, the end portion of the rotating electrical machine is integrally formed with a boss portion that is formed concentrically with the rotating shaft and protrudes to the side from which the rotating shaft protrudes. A plurality of protrusions protruding toward the center of the through hole and in contact with the outer peripheral surface of the boss portion are spaced apart in the circumferential direction of the rotating shaft at the opposing portion of the first mounting flange plate of the vibration isolating connector. It is integrally formed in the state.
[0007]
When the size of the through hole formed in the first mounting flange plate is made larger than the outer shape of the boss portion, the first mounting flange plate of the vibration isolating coupler is attached to the end portion of the rotating electrical machine. It takes time and labor to position the mounting flange plate. Therefore, the inventor tried to determine the shape of the through hole so that the inner peripheral surface of the through hole is almost entirely in contact with the boss portion, and to position the vibration-proof connector by fitting the through hole and the boss portion. I tried. However, in this structure, unless the vibration isolator is attached with the plate surface of the first mounting flange plate and the end surface from which the end of the rotating electrical machine protrudes being substantially parallel, the inner surface of the through hole is the boss. There was a problem that the first mounting flange plate could not be smoothly mounted due to being caught on the outer surface of the part. Further, it was found that the vibration proof performance is somewhat deteriorated because vibration is transmitted from the contact portion between the inner surface of the through hole and the outer surface of the boss portion.
[0008]
On the other hand, as in the present invention, the first mounting flange plate protrudes toward the center of the through hole and has a plurality of protrusions contacting the outer peripheral surface of the boss portion spaced apart in the circumferential direction of the rotating shaft. If it forms integrally in the opposing part of this, positioning of the 1st flange plate for attachment can be simplified by the contact with the outer peripheral surface of a some projection part and a boss | hub part. It is also conceivable to form a plurality of protrusions on the outer periphery of the boss without forming protrusions on the first mounting flange plate. However, if the first mounting flange plate is provided with a plurality of projections, it is easier to process and higher processing accuracy can be obtained, so that the manufacturing cost can be reduced and the mounting accuracy can be increased.
[0009]
Further, according to the structure of the present invention, when the through hole of the first mounting flange plate is fitted to the boss portion, a plurality of spaces formed between the plurality of protrusions become escape portions, Even if the first mounting flange plate is mounted in a state where the plate surface of the first mounting flange plate is slightly inclined with respect to the end surface from which the boss portion protrudes, the through hole can be smoothly fitted into the boss portion. Can do. In addition, since the contact area between the plurality of protrusions and the outer peripheral surface of the boss portion is small, the amount of vibration transmitted through the contact portion is also small, and the vibration-proof performance is not substantially reduced.
[0010]
As for the shape of the boss part provided in the rotating electrical machine, the outer peripheral surface thereof preferably has a cylindrical surface or a truncated conical surface shape. In particular, when the boss portion has a truncated cone shape in which the diameter dimension decreases as it goes toward the tip, it is easy to mount the vibration-proof connector. The upper limit of the number of protrusions is naturally determined by the diameter of the through hole or the diameter of the inscribed circle of the plurality of protrusions. Incidentally, when the diameter dimension of the inscribed circle of the plurality of protrusions is 22 mm, it is preferable to provide a minimum of three protrusions and a maximum of eight protrusions at equal intervals in the circumferential direction.
[0011]
The shape of the plurality of protrusions is such that the contact area with the outer peripheral surface of the boss part is not so large, and does not become a major obstacle when fitting the boss part into the through hole of the first mounting flange plate Any shape can be used. More specifically, it is preferable to determine the contour shape of the protrusion viewed from the axial direction of the rotation shaft so that the contact between the protrusion and the boss is close to a point contact. In particular, when the contour shape of the protrusion is substantially arcuate, the contact area and contact resistance between the protrusion and the outer peripheral surface of the boss portion are reduced, and the first mounting flange plate can be easily attached.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1A to 1F are a left side view, a front view, a rear view, a right side view, a plan view, and a bottom view of an example of an anti-vibration connector used in the fixing structure of a rotating electric machine according to the present invention. 2 (A) to 2 (E) are cross-sectional views taken along line AA in FIG. 1 (B), cross-sectional views taken along line BB in FIG. 1 (B), and cross-sectional views taken along line CC in FIG. 1 (B). It is the DD sectional view taken on the line of FIG. 1 (B), and the EE sectional view taken on the line of FIG. 1 (B). 3 shows a state in which a rotating electric machine such as a stepping motor is mounted on the bracket using the vibration isolating coupler shown in FIG. 1, and FIG. 4 shows the stepping on the fixed portion using the vibration isolating coupler shown in FIG. It is a general | schematic fragmentary sectional view for demonstrating the state which fixed rotating electrical machines, such as a motor.
[0013]
In FIG. 4, the stepping motor 1 is attached to the bracket 9 of the driven device via the anti-vibration coupler 2. As shown in FIGS. 1 and 2, the vibration isolating connector 2 is composed of a pair of mounting flange plates 3 and 5 and a synthetic member disposed between the opposing portions 3 a and 5 a of the pair of mounting flange plates 3 and 5. And an elastic body 7 made of a rubber material. As shown in FIG. 4, the first mounting flange plate 3 is attached to the end of the rotating electric machine 1 on the side from which the rotating shaft 1 c projects or the flange 1 a, and the second mounting flange plate 5 is attached to the rotating electric machine 1. It is attached to the bracket 9 of the fixed part to be fixed. As shown in FIG. 4, a boss portion 1 b that is concentrically formed with the rotating shaft 1 c and protrudes to the side from which the rotating shaft 1 c protrudes is integrally formed at the end portion of the rotating electrical machine 1. The boss 1b has a shape in which the outer peripheral surface is a truncated conical surface. In other words, the boss 1b has a truncated cone-shaped outer shape whose diameter dimension decreases toward the tip.
[0014]
The pair of mounting flange plates 3 and 5 are steel metal plates. The pair of mounting flange plates 3 and 5 are formed with through holes 3b and 5b, respectively, in the center. Four protruding portions 4 projecting toward the central portion of the through hole 3b and coming into contact with the outer peripheral surface of the boss portion 1b of the rotating electrical machine 1 shown in FIG. Are integrally formed with an interval (90 ° interval) equal to the circumferential direction of the rotating shaft 1 c of the rotating electrical machine 1. The outline shape of the four protrusions 4 has a substantially arc shape. The shape of the projecting portions 4 is such that the contact area with the outer peripheral surface of the boss portion 1b is not so large, and when the boss portion 1b is fitted into the through hole 3b of the first mounting flange plate 3. Any shape may be used as long as it does not cause a major obstacle. As in this example, when the semicircular protrusions 4 are used, the contact between the protrusions 4 and the boss 1b is close to a point contact. And the contact area and contact resistance between the projection part 4 ... and the outer peripheral surface of the boss | hub part 1b are small.
[0015]
Further, four mounting portions 3c, 5c,... Are integrally provided on the pair of mounting flange plates 3, 5 at predetermined intervals in the circumferential direction. .., 5c... Are formed with screw mounting holes 3d. The attachment portions 3c of the flange plate 3 protrude radially outward from the facing portion 3a. The mounting portion 5c of the flange plate 5 also protrudes radially outward from the facing portion 5a, has a shape with a head at the tip of the neck, and the head extends slightly to both sides in the circumferential direction. It has a flat shape.
[0016]
In the flange plates 3 and 5, the mounting portion 3c of the flange plate 3 and the facing portion 5a of the flange plate 5 do not completely face each other, and the mounting holes 3d for screwing, 5d, and the mounting portion 5c, 3c ... is arranged so as not to oppose. With such an arrangement, the elastic body 7 formed using the two mating dies is provided so that the opposing surfaces of the opposing portions 3a and 5a of the mounting flange plates 3 and 5 (the opposing portions 3a and 5a are mutually connected). Is formed so that there is no portion that is not bonded to the elastic body 7 on the surface to which the elastic body 7 is bonded. That is, the area of the joint surface where the elastic body 7 joins the facing surfaces of the facing portions 3a and 5a of the flange plates 3 and 5 does not become smaller than the facing surfaces of the facing portions 3a and 5a of the flange plate, The flange plates 3 and 5 have substantially the same or larger area as the opposed surfaces of the opposed portions 3a and 5a. The opposing surfaces of the opposing portions 3a and 5a of the flange plates 3 and 5 may be subjected to a blasting process or a retaining protrusion to enhance the adhesive force with the elastic body 7. In this example, the elastic body 7 is also located between the protrusion 4 and the flange plate 5. The elastic body 7 is also formed in the portion surrounding the through hole 5b of the flange plate 5 in relation to the mold and not facing the flange plate 3, and this portion is exposed in the through hole 3b of the flange plate 3. Yes. Since the elastic body can be deformed, the exposed portion of the elastic body 7 does not become an obstacle when the boss portion 1b and the through hole 3b are fitted.
[0017]
The elastic body 7 is formed of a rubber elastic material synthesized by adding a vulcanizing agent to nitrile rubber (NBR). As such a rubber elastic material, butadiene rubber, chloroprene rubber, butyl rubber, ethylene / propylene rubber, silicone rubber, fluorine rubber and the like can be used. The elastic body 7 is formed by kneading, and further formed between the opposing surfaces of the opposing portions 3a and 5a of the pair of mounting flange plates 3 and 5 through an adhesive by heating.
[0018]
As shown in FIG. 3 or 4, the anti-vibration coupler 2 having such a structure is disposed between the bracket 9 of the driven device and the end of the rotating electrical machine 1, that is, the flange 1 a. A rotating shaft 1 c of the rotating electrical machine extends through the through holes 3 b and 5 b of the vibration isolation connector 2 and extends into the bracket 9. The flange plate 3 of the anti-vibration connector 2 is attached to the flange 1a of the rotating electrical machine 1 using four screws 8. Further, the flange plate 5 of the vibration proof connector 2 is attached to the wall portion of the bracket 9 using four screws 6. In this structure, the vibration isolator 2 absorbs vibration generated from the rotating electrical machine 1 such as a stepping motor, and therefore the vibration of the rotating electrical machine is difficult to be transmitted to the bracket 9.
[0019]
The attachment portions 3c ..., 5c ... are not limited to the above arrangement, and any arrangement may be employed as long as they do not face each other.
[0020]
In particular, in the above embodiment, as shown in FIG. 2B, the outer peripheral surface 7a of the rubber elastic body 7 and the outer peripheral surfaces 3f and 5g corresponding to the facing portions 3a and 5a of the flange plates 3 and 5 are formed. It is formed so as to be substantially flush. As a result, the anti-vibration connector 2 is formed so that there is no portion where the elastic body is not joined to the facing portions 3a, 5a of the flange plates 3, 5. Therefore, the ratio of the size of the rubber elastic body to the size of the flange plate can be increased. As a result, it is possible to obtain an anti-vibration connector having higher vibration absorption performance than the conventional anti-vibration connector.
[0021]
FIGS. 5A to 5F are a left side view, a front view, a rear view, a right side view, a plan view, and a bottom view of another example of the vibration isolating coupler used in the fixing structure of the rotating electrical machine of the present invention. 6A to 6C are a cross-sectional view taken along line AA in FIG. 5B, a cross-sectional view taken along line BB in FIG. 5B, and a cross-sectional view taken along line CC in FIG. 5B. FIG. FIG. 7 is a view showing a state in which a rotating electrical machine such as a stepping motor is mounted on the bracket using the anti-vibration coupler of FIG. In FIGS. 5 to 7, the same members as those shown in FIGS. 1 to 4 are denoted by the same reference numerals as those shown in FIGS. 1 to 4, and a detailed description thereof is omitted. To do. In this anti-vibration connector 12, the first and second mounting flange plates 13 and 15 both have two mounting portions 13c,. As shown in FIGS. 5B and 5C, the two attachment portions 13c... 15c are formed with an interval of 180 degrees, and the two flange plates 13 and 15 are formed. The mounting portion 13c and the mounting portion 15c are arranged in a positional relationship where the angle is about 90 degrees. The method for forming the elastic body 17 is the same as the method for forming the elastic body 7. Also in this example, the four protruding portions 14... Projecting toward the center portion of the through hole 13 b and contacting the outer peripheral surface of the boss portion of the rotating electrical machine 1 are formed on the facing portion 13 b of the first mounting flange plate 13. These are integrally formed with an interval (90 ° interval) equal to the circumferential direction of one rotating shaft. The four protrusions 14 have a substantially semicircular shape, and the contour shape thereof has a substantially arc shape.
[0022]
In the above example, the outer shape of the boss portion 1b of the rotating electrical machine 1 has a truncated cone shape, but the boss portion may be cylindrical. In the above two examples, the number of the protrusions is four. The number may be three or more, and the protrusions are preferably arranged at equal intervals.
[0023]
【The invention's effect】
As in the present invention, a plurality of protrusions that protrude toward the center of the through hole and come into contact with the outer peripheral surface of the boss portion are opposed to the first mounting flange plate in a state spaced apart in the circumferential direction of the rotating shaft. When formed integrally, there is an advantage that the positioning of the first mounting flange plate can be simplified by contact between the plurality of protrusions and the outer peripheral surface of the boss.
[0024]
Further, when a plurality of protrusions are provided on the first mounting flange plate, processing is easy and processing accuracy is easily obtained, so that there is an advantage that the manufacturing cost can be reduced and the mounting accuracy can be increased. Furthermore, according to the structure of the present invention, when the through hole of the first mounting flange plate is fitted to the boss portion, the plate of the first mounting flange plate against the end surface from which the boss portion of the rotating electrical machine protrudes. Even if the first mounting flange plate is attached with the surface slightly inclined, there is an advantage that the through hole can be smoothly fitted to the boss portion. In addition, since the contact area between the plurality of protrusions and the outer peripheral surface of the boss part becomes small, the amount of vibration transmitted through the contact part is also small, and the vibration-proof performance is not substantially reduced. Is obtained.
[Brief description of the drawings]
1A to 1F are a left side view, a front view, a rear view, a right side view, a plan view, and a bottom view of an example of an anti-vibration connector used in a fixing structure for a rotating electrical machine according to the present invention. is there.
2A to 2E are cross-sectional views taken along the line AA in FIG. 1B, the cross-sectional view taken along the line BB in FIG. 1B, and the cross-sectional view taken along the line CC in FIG. FIG. 2 is a cross-sectional view taken along line D-D in FIG. 1B and a cross-sectional view taken along line E-E in FIG.
3 is a reference diagram showing a state in which a rotating electrical machine such as a stepping motor is mounted on a bracket using the vibration-proof connector of FIG. 1. FIG.
4 is a schematic partial cross-sectional view for explaining a state in which a rotary electric machine such as a stepping motor is fixed to a fixed portion using the vibration isolating coupler of FIG. 1;
FIGS. 5A to 5F are a left side view, a front view, a rear view, a right side view, a plan view, and a bottom view of another example of an anti-vibration coupler used in the fixing structure for a rotating electric machine according to the present invention. FIG.
6A to 6C are cross-sectional views taken along the line AA in FIG. 5B, the cross-sectional view taken along the line BB in FIG. 5B, and the cross-sectional view taken along the line CC in FIG. FIG.
7 is a view showing a state in which a rotating electrical machine such as a stepping motor is mounted on a bracket using the anti-vibration coupler of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating electric machine 2,12 Anti-vibration coupling tool 3,5,13,15 Mounting flange board 3a, 5a, 13a, 15a Opposing part 3b, 5b, 13b, 15b Through-hole 3c, 5c, 13c, 15c Mounting part 3d, 5d, 13d, 15d Mounting holes 4, 14 Protrusions 7, 17 Rubber elastic body

Claims (8)

A first mounting flange plate attached to the end of the rotating electrical machine on which the rotating shaft projects;
A second mounting flange plate attached to a fixed part for fixing the rotating electrical machine;
An annular elastic body disposed between the first and second mounting flange plates and bonded to both;
The first and second mounting flange plates each have a ring-shaped opposing portion provided with a through-hole through which the rotating shaft passes in the center, and a plurality of mountings protruding outside the opposing portion and provided with mounting holes, respectively. And the first and second mounting flanges such that the plurality of mounting portions of the first mounting flange plate and the plurality of mounting portions of the second mounting flange plate do not face each other. A rotating electric machine fixing structure for fixing the rotating electric machine to the fixed part using a vibration isolating connector in which the opposing portions of the plates are opposed to each other with the elastic body in between;
The end portion of the rotating electrical machine is integrally formed with a boss portion that is formed concentrically with the rotating shaft and protrudes to the side from which the rotating shaft protrudes,
A plurality of protrusions projecting toward the center portion of the through hole and in contact with the outer peripheral surface of the boss portion are formed on the facing portion of the first mounting flange plate of the vibration isolation connector. A rotating electric machine fixing structure, wherein the rotating electric machine is integrally formed with an interval in a direction. The outer peripheral surface of the boss portion has a truncated cone surface shape whose diameter decreases toward the cylindrical surface or the tip,
The rotating electric machine fixing structure according to claim 1, wherein the three or more protrusions are provided at equal intervals in the circumferential direction. 3. The rotating electrical machine according to claim 2, wherein a contour shape of the protruding portion viewed from an axial direction of the rotating shaft is determined so that contact between the protruding portion and the boss portion is close to point contact. Fixed structure. The rotating electric machine fixing structure according to claim 3, wherein the contour shape is a substantially arc shape. A first flange plate for mounting that is attached to the end of the motor in which a boss portion is provided integrally with the rotating shaft at the end on the side from which the rotating shaft protrudes;
A second mounting flange plate attached to a fixed portion for fixing the motor;
An annular elastic body disposed between the first and second mounting flange plates and bonded to both;
The first and second mounting flange plates each have a ring-shaped opposing portion provided with a through-hole through which the rotating shaft passes in the center, and a plurality of mountings protruding outside the opposing portion and provided with mounting holes, respectively. And the first and second mounting flanges such that the plurality of mounting portions of the first mounting flange plate and the plurality of mounting portions of the second mounting flange plate do not face each other. Each of the opposing portions of the plate is an anti-vibration connector in which the elastic body is interposed therebetween,
A plurality of protrusions projecting toward the center portion of the through hole and in contact with the outer peripheral surface of the boss portion are formed on the facing portion of the first mounting flange plate of the vibration isolation connector. An anti-vibration connector characterized in that the anti-vibration connector is integrally formed with an interval in the direction. The anti-vibration connector according to claim 5, wherein the three or more protrusions are provided at equal intervals in the circumferential direction. The anti-vibration connection according to claim 6, wherein a contour shape of the projecting portion viewed from the axial direction of the rotating shaft is determined so that the contact between the projecting portion and the boss portion is close to a point contact. Ingredients. The anti-vibration connector according to claim 7, wherein the contour shape is substantially an arc shape.

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