JP6890535B2 - Centering device and centering coupling - Google Patents

Description

Detailed description of the invention

The present invention provides a centering device for aligning the center line of the shaft with the center line of the ring member when an annular member having an inner diameter larger than the outer diameter of the shaft is fitted to the cylindrical or cylindrical shaft. A centering coupling that uses the device to connect a drive shaft that moves forward and backward in the axial direction and a driven shaft that is arranged coaxially with the drive shaft so that they move integrally in the axial direction. Concerning a coupling suitable for connecting the injection cylinder rod and the plunger rod of the machine.

As shown in FIG. 4, in the die gust casting machine 1, the plunger rod 3 is fitted to the plunger sleeve 2 so as to be movable in the axial direction, and the rod 5 of the injection cylinder 4 is connected to the rear end of the plunger rod 3. , The plunger rod 3 is moved in the axial direction by the injection cylinder 4, and the molten metal in the plunger sleeve 2 is pushed out by the tip plunger tip 3b of the plunger rod 3 during forward movement to perform an injection process on the mold and retreat. The hot water supply process is performed from the hot water supply port 6 into the plunger sleeve 2 by the movement.

In the die gust casting machine 1 as described above, the hot water supply port 6 is located at a position offset to the rear end with respect to the plunger sleeve 2, and when the molten metal is supplied into the plunger sleeve 2 from the hot water supply port 6, a plan is provided. The contact conditions of the molten metal are different in the entire length of the jar sleeve 2, such as a gap at the upper part, and a part of the molten metal under pressure by the plunger tip 3b during the injection process will spill out from the hot water supply port 6. , The molten metal in the plunger sleeve 2 cannot be 100% filled in the mold.

As described above, when the contact conditions of the molten metal in the entire length of the plunger sleeve 2 are different and the molten metal spilled from the hot water supply port 6 partially adheres to the plunger sleeve 2, the heat of the plunger sleeve 2 rises. It changes partially, and the plunger sleeve 2 cannot be expanded uniformly.

Therefore, the plunger sleeve 2 itself is deformed on the rear end side with the fixed end on the mold side as the base point, and the position of the axial center of the plunger tip 3b moving in the plunger sleeve 2 is the reference horizontal. Fluctuations occur with respect to the axial center, and therefore, the plunger lot 3 and the rod 5 of the injection cylinder 4 cannot be directly connected by a rigid structure, so that the change in thermal expansion of the plunger sleeve 2 can be dealt with. The coupling 7 that connects the plunger rod 3 of the die gust casting machine 1 and the rod 5 of the injection cylinder 4 is required to have a structure that allows the axial center of the plunger tip 3a to fluctuate at the coupling portion.

Japanese Patent No. 4697091

By the way, in the conventional coupling 7 as described above, a gap is provided between the inner circumference of the casing 9 and the fitting of the plunger rod 3 and the rod 5 of the injection cylinder 4 and the spacer 8 to plan within the gap range. By making the angle of the jar rod 3 variable, it is possible to allow the axial center of the plunger tip 3a to fluctuate. However, due to this gap, after the plunger rod 3 with respect to the axial center of the lot 5 of the injection cylinder 4. The end position is lowered by the gap, so that the joint portion between the plunger rod 3 and the rod 5 of the injection cylinder 4 is misaligned, and the axial centers of the plunger rod 3 and the rod 5 of the injection cylinder 4 are arranged on a line. You will not be able to.

As described above, if the axial centers of the plunger rod 3 and the rod 5 of the injection cylinder 4 are not located on a line, the loss when the force at the time of pressurizing the molten metal of the injection cylinder 4 is transmitted to the plunger rod 3 is lost. There is a problem that it occurs frequently.

Further, if the joint portion between the plunger rod 3 and the rod 5 of the injection cylinder 4 is misaligned while allowing the fluctuation of the axial center of the plunger tip 3a, the plunger sleeve 2 and the plunger tip 3a are formed during injection molding. There is also a problem that an unreasonable force is applied between the two, and deformation and wear often occur on the mating surfaces of the two.

Therefore, the subject of the invention disclosed in Patent Document 1 is that a coupling state in which no misalignment occurs at the coupling portion between the drive shaft and the driven shaft can be ensured, and the shaft is not completely fixed in close contact with the shaft on the driven shaft side. It can follow changes in the heart, and by arranging the axes of the drive shaft and the driven shaft on a single line, the transmission loss of the advancing and retreating force of the drive shaft with respect to the driven shaft is reduced, and the occurrence of deformation wear on the driven shaft side is reduced. The purpose is to provide a centering coupling that can be used.

Here, first, the centering coupling described in Patent Document 1 will be described with reference to FIG. The same parts as those shown in FIG. 4 are designated by the same reference numerals, and specific description thereof will be omitted.

FIG. 5 shows the structure of the centering coupling 11 that connects the rod (drive shaft) 5 of the injection cylinder of the die gust casting machine and the plunger lot (driven shaft) 3, and the small diameter shaft portion at the tip of the lot 5 of the injection cylinder. A large-diameter portion 5a is provided at the tip of 5b and its tip, and a large-diameter portion 3a is provided at the rear end of the plunger rod 3, and the rod 5 and the plunger rod 3 of the injection cylinder 4 arranged in a coaxial center are axially arranged. It is connected so that it moves integrally with.

The centering coupling 11 is axially fitted to the drive shaft side casing 12 which is externally fitted and fixed to the tip end portion of the rod 5 of the injection cylinder 4 so as to move integrally in the axial direction, and to the rear end portion of the plunger rod 3. After the driven shaft side casing 13 coupled to the drive shaft side casing 12 in a state of being externally fitted so as to be movable, the drive shaft side spacer 14 provided at the tip of the rod 5 of the injection cylinder 4, and the plunger rod 3. A driven shaft side spacer 15 provided at the end, a centering ring 16 arranged so as to fit outside the plunger rod 3 inside the driven shaft side casing 13, and a centering ring 16 always mounted on the drive shaft side casing 12. It is formed by a spring 17 that urges elasticity in the abutting direction.

The drive shaft side spacer 14 is attached in a cap shape so as to be fitted onto the large diameter portion 5a of the rod 5 of the injection cylinder 4, and the driven shaft side spacer 15 has the same diameter as the large diameter portion 3a of the plunger rod 3. The tip surface of the large diameter portion 5a of the rod 5 of the injection cylinder 4, the drive shaft side spacer 14, the driven shaft side spacer 15, and the driven shaft side spacer 15 are arranged between the drive shaft side spacer 14 and the large diameter portion 3a. The rear end surfaces of the large diameter portion 3a of the plunger rod 3 are in close contact with each other.

The front and rear overlapping surfaces of the drive shaft side spacer 14 and the driven shaft side spacer 15 are fitted with a conical convex portion 18 provided on the drive shaft side spacer 14 and a conical concave portion 19 provided on the driven shaft side spacer 15. An uneven fitting surface 20 is formed, and the front and rear contact surfaces of the spacers 14 and 15 and the contact surface between the driven shaft side spacer 15 and the rear end side large diameter portion 3a of the plunger rod 3 are used for shock absorption. Urethane 21 is incorporated.

The fitting surface 20 prevents the occurrence of misalignment of the joint portion between the rod 5 of the injection cylinder 4 and the plunger rod 3 arranged in a coaxial center shape by fitting the convex portion 18 of the cone and the concave portion 19 of the cone. Is.

The fitting surface 20 is formed by directly contacting the front end surface of the rod 5 of the injection cylinder 4 with the rear end surface of the plunger lot 3 and forming the convex portion 18 and the concave portion 19 on the contact surface. The structure may be such that the use of the spacers 14 and 15 is omitted.

The drive shaft side casing 12 has a cylindrical halved structure, and is fitted from both sides over the drive shaft side spacer 14 attached to the small diameter shaft portion 5b of the rod 5 of the injection cylinder 4 and the tip side large diameter portion 5a. Then, while connecting and fixing with a plurality of tightening bolts, the holding bolt 22 at the rear end is screwed in to press the steel ball 23 against the corner of the small diameter shaft portion 5b, so that the rod 5 of the injection cylinder 4 has play. It is fixed in the absence state.

The driven shaft side casing 13 is provided with a through hole 24 for the plunger rod 3 in an end wall 13b provided at one end of a cylindrical portion 13a that is externally fitted and fixed to the drive shaft side casing 12 by screw coupling, and the plunger rod 3 is provided with a through hole 24. The centering ring 16 is housed inside the outer fitting portion.

The inner diameter of the centering ring 16 fits outerly over the large diameter portion 3a on the rear end side of the plunger rod 3 and the spacer 15 on the driven shaft side, and the core is between the outer circumference thereof and the inner circumference of the casing 13 on the driven shaft side. A gap a is secured to allow the extension ring 16 to move in the axial direction and the radial direction, and the front side of the rear end side large diameter portion 3a is in a state where the rear end surface is in contact with the front end surface of the drive shaft side casing 12. It is engaged with the plunger rod 3 so as to move integrally in the forward direction of the plunger rod 3 by engaging with the step portion.

Spring storage holes 25 are provided at regular intervals in the circumferential direction on the tip side of the centering ring 16, and the spring 17 incorporated in the spring storage holes 25 is contracted with the end wall 13b of the driven shaft side casing 13. By doing so, the centering ring 16 is urged to have elasticity in the receding direction in which the rear end surface always abuts on the front end surface of the drive shaft side casing 12, and between the tip end surface and the end wall 13b of the driven shaft side casing 13. , A gap b is secured to allow the centering ring 16 to move forward.

The centering coupling 11 has the above-described configuration, and as shown in FIG. 5, when the plunger rod 3 is extruded by the rod 5 of the injection cylinder 4, the tip surface of the rod 5 of the injection cylinder 4 and both spacers 14 , 15 and the rear end surface of the plunger rod 3 are in close contact with each other, and the rod 5 of the injection cylinder 4 and the plunger rod 3 are joined to each other on the fitting surface 20 due to the fitting of the convex portion 18 and the concave portion 19 so as not to be misaligned. The rod 5 and the plunger rod 3 are arranged on one axis, and the advance / retreat of the rod 5 of the injection cylinder 4 is transmitted to the plunger rod 3.

Further, when the axial center of the plunger tip 3a fluctuates with respect to the axial center of the rod 5 of the injection cylinder 4 due to thermal deformation of the plunger sleeve 2, the plunger rod 3 and the centering ring 16 are within the range of the gaps a and b. By moving with, the fluctuation can be absorbed.

As described above, when the axial center of the plunger tip 3a fluctuates, the plunger rod 3 and the centering ring 16 move within the range of the gaps a and b to absorb the fluctuation, so that the rod 5 of the injection cylinder 4 When the plunger rod 3 is extruded by, the rod 5 of the injection cylinder 4 and the plunger rod 3 are in close contact with the front end surface of the rod 5 of the injection cylinder 4, the spacers 14, 15 and the rear end surface of the plunger rod 3. The arrangement on the line is maintained, the forward force of the rod 5 of the injection cylinder 4 is transmitted to the plunger rod 3 100%, and the centering ring 16 absorbs the fluctuation of the axial center of the plunger tip 3a. It is possible to prevent the jar tip 3a and the plunger sleeve 2 supporting the plunger tip 3a from being worn.

Here, since the heating of the plunger sleeve 2 partially changes and the plunger sleeve 2 cannot expand uniformly, when the rod 5 and the plunger rod 3 of the injection cylinder 4 retract after the filling of the molten metal is completed. When the heat rise of the plunger sleeve 2 has a large partial change, the inside of the spring storage hole 25 in which the front end surface of the rod 5 of the injection cylinder 4 and both spacers 14 and 15 and the rear end surface of the plunger rod 3 are in close contact with each other. When the slip resistance between the plunger sleeve 2 and the plunger tip 3a increases due to a thermal change due to the force of the spring 17 incorporated in the spacer 17, a gap is formed between the spacers 14 and 15.

However, since the amount of insertion of the plunger tip 3a into the plunger sleeve 2 is small in the retreat limit, the force of the spring 17 increases when the slip resistance suddenly decreases, and the impact at the time of close contact between the spacers 14 and 15 is generated. Although it will occur, the shock absorbing urethane 21 provided on the front and rear contact surfaces of both spacers 14 and 15 and the contact surface between the driven shaft side spacer 15 and the rear end side large diameter portion of the plunger rod 3 is described above. It will absorb the impact.

The centering coupling described in the above-mentioned Patent Document 1 also has the following problems.
That is, when the drive shaft side caging 12 is fixed to the rod 5, the center lines of the rod 5 and the drive shaft side caging 12 do not match due to the tolerance at the time of manufacturing parts, and as a result, the quality of the product is adversely affected. Was there.
The present invention has been made in view of the problems of the conventional apparatus, in which a truncated cone-shaped conical wedge is attached to a rod so that the center lines of the rod 5 and the drive shaft side caging 12 are completely aligned with each other. Is.

(1) In the first invention, when an annular member having an inner diameter portion larger than the outer diameter of the shaft is fitted to a cylindrical or cylindrical shaft, the center line of the shaft and the annular member coincide with each other. It is a centering device for making the centering device, in which a through hole is formed inside and a truncated cone-shaped conical wedge is fitted to the shaft, and a conical recess having a shape similar to the conical wedge is formed on the inner surface of the annular member. It is a centering device that is formed and is characterized in that the annular member is fitted to the conical wedge so that the conical recess is in close contact with the conical wedge.
According to the present invention, since the annular member is fitted to the conical wedge so that the conical recess is in close contact with the conical wedge, the axis and the center line of the annular member can be aligned with each other.
(2) It is desirable that the annular member is urged so that the conical recess presses the conical wedge in a direction parallel to the axis.
When the annular member is urged so that the conical recess presses the conical wedge in a direction parallel to the axis, the conical recess presses the conical wedge in the radial direction and the conical wedge is interposed. The shaft and the annular member are strongly adhered to each other, and the center line of the shaft and the annular member can be more accurately aligned with each other.
(3) It is desirable that the conical wedge is divided into a plurality of pieces in the circumferential direction.
When the conical wedge is divided into a plurality of pieces in the circumferential direction, the degree of freedom of the conical wedge is increased.
(4) It is desirable that a gap is formed between the conical wedges when the conical wedge is fitted to the shaft.
If the conical wedge is configured so that a gap is formed between the conical wedges when the conical wedge is fitted to the shaft, even if the dimensional accuracy in the circumferential direction of the conical wedge is not so high, the annular member and the annular member Adhere to the shaft with a degree of freedom.
(5) It is desirable that the conical wedge is formed with a slit from the side having a thin cross section to the side having a thick cross section.
When a slit is formed in the conical wedge from the thin side to the thick side , the degree of freedom of the thin portion is increased, the shaft is tightly adhered, and the center line of the shaft and the annular member are aligned more accurately. Can be made to.

(6) Another invention is a centering cup that connects a drive shaft that moves forward and backward along the axial direction and a driven shaft that is arranged coaxially with the drive shaft so as to move integrally in the axial direction. A ring in which the contact surface between the front end of the drive shaft and the rear end of the driven shaft is formed as an uneven fitting surface for connecting the drive shaft and the driven shaft without misalignment. The drive shaft side casing is externally fitted and fixed to the tip end portion of the drive shaft so as to move integrally with the drive shaft in the axial direction, and the cylindrical driven shaft side casing outerly fitted to the rear end portion of the driven shaft is the drive shaft. It is coupled to the side casing, and the relationship between the driven shaft side casing and the driven shaft is set so that the driven shaft can move in the axial direction with respect to the driven shaft side casing, and the drive shaft has an enlarged diameter portion at the tip. A cylindrical wedge ring having a casing with a large diameter at the front is fitted behind the enlarged diameter portion, and a conical recess is formed inside the conical wedge. The conical surfaces are fitted so as to be in close contact with each other, and the wedge ring is bolted to the drive shaft side casing to secure a gap between the outer circumference of the driven shaft and the inner circumference of the driven shaft side casing. Further, a gap is secured between the driven shaft and the end wall of the driven shaft side casing, and the centering is elastically urged in the direction in which the driven shaft and the driven shaft side casing are separated from each other. It is a coupling.
According to the present invention, since the shaft, the conical wedge, and the drive shaft side casing are in close contact with each other, the center lines of the shaft and the drive shaft side casing can be aligned with each other.
(7) A conical convex portion or concave portion is formed at the rear end of the driven shaft, a conical concave portion or convex portion is formed at the tip of the drive shaft, and the convex portion and the concave portion are fitted to each other to fit the drive shaft. It is desirable that the driven shaft and the driven shaft come into direct contact with each other.
When the convex portion and the concave portion are fitted to each other and the drive shaft and the driven shaft come into direct contact with each other, it becomes easy to align the axis of the drive shaft with the axis of the driven shaft.
(8) It is desirable that a driven shaft side spacer having a conical convex portion formed at the rear end of the driven shaft is mounted, and a conical concave portion is formed at the tip of the driving shaft side casing.
If the structure is such that the driven shaft side spacer is mounted at the rear end of the driven shaft, the driven shaft side spacer can be manufactured separately from the driven shaft, and the manufacturing efficiency is improved.
(9) It is desirable that a driven shaft side spacer having a conical concave portion formed at the rear end of the driven shaft is mounted, and a conical convex portion is formed at the tip of the driving shaft side casing.
If the structure is such that the driven shaft side spacer is mounted at the rear end of the driven shaft, the driven shaft side spacer can be manufactured separately from the driven shaft, and the manufacturing efficiency is improved.
(10) It is desirable that the tip of the convex portion is formed flat so as not to come into contact with the bottom of the concave portion.
When the tip of the convex portion is formed flat, the tip does not contact the bottom of the concave portion, so that the degree of freedom of contact between the convex portion and the concave portion is improved.
(11) It is desirable that the bottom of the concave portion is scooped out so as not to come into contact with the tip of the convex portion.
When the bottom portion of the concave portion is hollowed out, the tip of the convex portion does not come into contact with the bottom portion of the concave portion, so that the degree of freedom of contact between the convex portion and the concave portion is improved.

In the present invention, the conical wedge is fitted to the shaft, and a conical recess having a shape similar to that of the conical wedge is formed on the inner surface of the annular member. The shaft and the central axis of the annular member are completely aligned with each other.

It is a vertical sectional view of one Embodiment of this invention. It is an exploded side view of one Embodiment of this invention. It is a perspective view of the conical wedge and the annular member of one Embodiment of this invention. It is a vertical cross-sectional view which shows the connection state of the rod (drive shaft) and the rod (driven shaft) of an injection cylinder in a die casting machine. It is a vertical sectional view of the conventional centering coupling. It is a vertical sectional view of another embodiment of this invention.

An embodiment of the present invention will be described with reference to FIGS. 1 to 3, but the same parts as those of the conventional apparatus are designated by the same reference numerals, and detailed description of the structure and operation of the parts will be omitted.
Behind the large diameter portion 5a of the rod 5 of the injection cylinder 4, the large diameter portion 27d is slightly larger than the large diameter portion 5a of the rod 5, and the small diameter portion 27c is from the small diameter shaft portion 5b of the rod 5 of the injection cylinder 4. A conical wedge 27 made of a truncated cone-shaped cylinder having a slightly larger diameter is fitted in half.

A gap 27b is formed at the circumferential end of the two conical wedges 27 in a state of being fitted to the rod 5 of the injection cylinder 4. Further, three slits 27a are cut from each of the small diameter side (thin cross section side) to the large diameter side (hot cross section side). When the slit 27a is cut in this way, the small diameter side tends to bend in the radial direction, and the rod 5 of the injection cylinder 4 easily adheres to the rod 5.

Further, on the outside of the conical wedge 27, a wedge ring 26 as an annular member having a cylindrical outer shape in which a conical recess 26a having a shape similar to that of the conical wedge 27 is formed on the inner surface thereof is in close contact with each other. It is fitted like this. The wedge ring 26 is also divided into two parts, but the end faces in the circumferential direction are configured to be in close contact with each other.
A plurality of bolt holes 29 extending in a direction parallel to the axial direction thereof are bored in the tip surface of the drive shaft side caging 12 along the vicinity of the circumference, and the wedge ring 26 is provided with the drive shaft side caging. A screw hole 28 communicating with the bolt hole 29 formed in the 12 is screwed.

Therefore, in order to mount the drive shaft side caging 12 on the rod 5 of the injection cylinder 4, first, the two conical wedges 27 are mounted on the small diameter shaft portion 5b of the rod 5 from the side surface, and then the side surface of the conical wedge 27 is mounted. Then, the drive shaft side caging 12 is fitted to the rod 5 of the injection cylinder 4, and the bolts are screwed into the bolt holes 29 and the screw holes 28 to tighten the wedge rings 26. Good.
Then, the wedge ring 26 in FIG. 1 is pulled in the direction of the conical wedge 27 (to the left), and the rod 5 of the injection cylinder 4 and the drive shaft side caging 12 are in a state where their central axes coincide with each other.
A recess 19 having a conical surface is cut in the central portion of the tip surface of the drive shaft side caging 12.

Further, a driven shaft side spacer 15 is attached to the rear end of the plunger rod 3, and a convex portion having a conical surface matching the concave portion 19 of the drive shaft side caging 12 at the rear end of the driven shaft side spacer 15. 18 is provided.
In order to provide a certain degree of freedom between the concave portion 19 of the drive shaft side caging 12 and the convex portion 18 of the driven shaft side spacer 15, the bottom portion of the concave portion 19 and the tip portion of the convex portion 18 do not come into direct contact with each other. In addition, the tip portion 18a of the convex portion 18 is formed to be slightly flat.
Instead of making the tip portion 18a of the convex portion 18 slightly flat, a gouged portion may be provided at the bottom of the concave portion 19.

Further, in the present embodiment, the driven shaft side spacer 15 is attached to the rear end of the plunger rod 3, but a convex portion similar to the convex portion 18 is formed on the rear end surface of the plunger rod 3. The convex portion and the concave portion 19 of the drive shaft side caging 12 may come into direct contact with each other.
Furthermore, a drive shaft side spacer may be attached to the tip of the drive shaft side caging 12, and a recess may be formed in the drive shaft side spacer.

In the embodiment shown in FIG. 1, a concave portion is cut on the rod 5 side and a convex portion is formed on the plunger rod 3 side, but a convex portion is cut on the rod 5 side and the plunger rod 3 side is formed. A recess may be formed in the.

Next, another embodiment will be described with reference to FIG.
Also in this figure, the same parts as those in FIG. 5 showing the prior art and FIG. 1 showing the embodiment are designated by the same reference numerals and the description thereof will be omitted.
The wedge ring 27 is shorter than that of the embodiment, and only the conical recess 26a is formed inside.

A conical concave portion 19 is formed on the rear end surface of the large diameter portion 3a of the plunger rod 3, and the convex portion 18 of the drive-side spacer 14 is fitted into the concave portion 19. The tip portion 18a of the convex portion is formed to be slightly flat.
Further, the drive shaft side casing 12 and the driven shaft side casing 13 are tightened with bolts (not shown).

1 Die Gust Casting Machine, 2 Plunger Sleeve, 3 Plunger Rod, 4 Injection Cylinder, 5 Injection Cylinder 4 Rod, 6 Hot Water Supply Port, 7 Coupling, 8 Spacer, 9 Casing, 11 Centering Coupling, 12 Drive Shaft Side Casing, 13 driven shaft side casing, 14 drive shaft side spacer, 15 driven shaft side spacer, 16 centering ring, 17 spring, 18 convex part, 19 concave part, 20 fitting surface, 21 urethane, 22 holding bolt, 23 steel ball , 24 through holes, 25 spring storage holes, 26 wedge rings, 27 conical wedges, 28 screw holes, 29 bolt holes, a gap, b gap.

Claims (6)

A centering coupling that connects a drive shaft that moves forward and backward along the axial direction and a driven shaft that is coaxially arranged with the drive shaft so as to move integrally in the axial direction.
The contact surface between the front end of the drive shaft and the rear end of the rear end of the driven shaft is formed as an uneven fitting surface for connecting the drive shaft and the driven shaft without misalignment.
The drive shaft side casing is externally fitted and fixed to the tip of the drive shaft so as to move integrally with the drive shaft in the axial direction.
A tubular driven shaft-side casing that fits outside the rear end of the driven shaft is coupled to the drive shaft-side casing, and the relationship between the driven shaft-side casing and the driven shaft is determined by the driven shaft with respect to the driven shaft-side casing. It is set so that it can be moved in the axial direction.
The drive shaft has a large-diameter portion at the tip, the drive shaft-side casing covers the front of the large-diameter portion of the drive shaft, and the front is behind the large-diameter portion of the drive shaft. A truncated cone-shaped conical wedge is fitted,
A cylindrical wedge ring having a conical recess formed therein is fitted to the conical wedge so that the conical surfaces are in close contact with each other, and the wedge ring penetrates the drive shaft side casing from the front and wedges. The drive shaft and the center line of the drive shaft side casing are aligned with each other by being tightened to the drive shaft side casing by a bolt screwed into the ring and pulled in the axial direction.
A gap is secured between the outer circumference of the driven shaft and the inner circumference of the casing on the driven shaft side, and further, a gap is secured between the driven shaft and the end wall protruding from one end of the casing on the driven shaft side to the inner circumference side. Being done
A centering coupling in which elasticity is urged between the driven shaft and the casing on the driven shaft side in a direction in which they are separated from each other in the axial direction. The conical protrusions or recesses on the rear end of the driven shaft is formed, the concave or convex portion conical at the tip of the drive shaft is formed, the drive shaft and the driven shaft each other fit said protrusion and recess centering coupling according to claim 1, wherein the direct contact. Wherein and rear conical driven shaft side spacer having a convex portion formed in the driven shaft is mounted, according to claim 1 core according out the tip conical recess of the drive shaft side casing are formed Coupling. The driven shaft side spacer conical recess formed at the rear end of the driven shaft is mounted, centered in claim 1, wherein the protrusions conical is formed at the distal end of the drive shaft side casing Coupling. The centering coupling according to any one of claims 2 to 4, wherein the tip of the convex portion is formed flat so as not to come into contact with the bottom of the concave portion. The centering coupling according to any one of claims 2 to 4, wherein the bottom portion of the concave portion is hollowed out so as not to come into contact with the tip end of the convex portion.

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