CN106015375B - Method for mounting torque limiter and method for assembling torque limiter - Google Patents
Method for mounting torque limiter and method for assembling torque limiter Download PDFInfo
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- CN106015375B CN106015375B CN201610196345.8A CN201610196345A CN106015375B CN 106015375 B CN106015375 B CN 106015375B CN 201610196345 A CN201610196345 A CN 201610196345A CN 106015375 B CN106015375 B CN 106015375B
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- 238000000034 method Methods 0.000 title claims description 23
- 230000002093 peripheral effect Effects 0.000 claims abstract description 20
- 238000003780 insertion Methods 0.000 claims description 31
- 230000037431 insertion Effects 0.000 claims description 31
- 239000004519 grease Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
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Abstract
The present invention provides a torque limiter for easily mounting a coil spring to an outer peripheral surface of an inner wheel without using a special jig for expanding an inner diameter of the coil spring, the torque limiter comprising: a shaft-like inner wheel; a coil spring attached to an outer peripheral surface of the inner ring so as to be in contact with the outer peripheral surface of the inner ring; and a cylindrical outer ring into which the inner ring to which the coil spring is attached is inserted. The inner ring and the outer ring have a common center axis, and the coil spring is engaged with the outer ring so as to be non-rotatable with respect to the outer ring. The inner wheel has: a large diameter portion to which a coil spring is attached; a small diameter portion formed on a tip end side of the large diameter portion; a slope portion formed between the large diameter portion and the small diameter portion. The diameter of the large diameter portion is larger than the inner diameter of the coil spring in a free state, and the diameter of the small diameter portion is smaller than the inner diameter of the coil spring in the free state. The slope portion is set to have a minimum diameter smaller than the inner diameter of the coil spring in a free state and a maximum diameter equal to the diameter of the large diameter portion.
Description
Technical Field
The present invention relates to a torque limiter including an inner ring and an outer ring which are relatively rotatable, and a coil spring interposed therebetween, wherein if a rotational torque of the inner ring and the outer ring which are relatively rotatable is greater than a predetermined value, the outer ring and the inner ring are relatively rotatable against a frictional force of the coil spring.
Background
A paper feeding device for feeding paper sheet by sheet from a paper sheet group stacked in an up-down direction is used in a printer or a copying machine. In such a paper feeding device, there are cases where a plurality of sheets of paper are taken out from a paper group in a stacked state in which the sheets are vertically attracted by a small mutual attraction force such as static electricity, and the sheets are supplied to a main body of a printer or a copier in the stacked state.
Fig. 7 shows a device disclosed in patent document 1 as an example of a paper feeding device using a torque limiter. The sheet feeding device S includes: a drive roller KR which is connected to an appropriate drive source such as a motor and rotates; a driven roller JR which is parallel to the rotation axis of the driving roller KR and rotates in response to the rotation of the driving roller KR; and a sheet tray PT that supports the sheet set. The surfaces of the drive roller KR and the driven roller JR are each covered with a resin material having a relatively high friction coefficient and elasticity, and the drive roller KR and the driven roller JR are closely adhered to each other by an appropriate urging member such as a spring. A torque limiter TL is incorporated in the driven roller JR.
When only one sheet is fed from the stacked sheet set to the sheet feeding device, as shown in fig. 7 (a), one sheet fed by the surface friction force between the sheet positioned on the upper surface of the stacked sheet set and the driving roller KR is fed to the sheet feeding device S and is brought into close contact with the driving roller KR and the driven roller JR. The sheet P is fed in the rotational direction of the drive roller KR by the frictional force between the drive roller KR rotating in the counterclockwise direction and the upper surface of the sheet P, and the driven roller JR is driven to rotate by applying a rotational torque greater than a predetermined value in the clockwise direction by the frictional force transmitted through the sheet P.
On the other hand, when the sheet is fed from the sheet group to the sheet feeding device in a state where the sheets are stacked up and down, as shown in fig. 7 (b), the stacked sheets P1 and P2 are fed to the sheet feeding device S by the frictional force of the driving roller KR in the stacked state, the driving roller KR is in close contact with the upper surface of the upper sheet P1, and the driven roller JR is in close contact with the lower surface of the lower sheet P2. Then, the upper sheet P1 is fed in the rotational direction of the drive roller KR by the frictional force between the drive roller KR rotating counterclockwise and the upper sheet P1. However, the upper sheet P1 and the lower sheet P2 are attracted to each other only by a small attraction force smaller than the above-described friction force, and when the above-described friction force is applied to the upper sheet P1, the upper sheet P1 is peeled off from the lower sheet P2, and a slip occurs between the upper sheet P1 and the lower sheet P2. Therefore, a small rotational torque equal to or less than a predetermined value is applied to the driven roller JR through the lower paper sheet P2. At this time, the rotation JR of the driven roller is locked by the torque limiter TL. After the driven roller JR is locked, the printer or copier reports the state of stacking of the sheets to the user based on the locking, and prompts the user to take out the stacked sheets.
The torque limiter is not limited to the paper feeding device, and may be a member that is separated from the load and protects the motor when an overload is applied to the motor or the like of the driving source. As a torque limiter, for example, a friction type torque limiter described in patent document 2 is known, and this is described with reference to fig. 8. The friction type torque limiter is provided with: a shaft-shaped inner wheel N; a coil spring B attached to an outer circumferential surface of the inner ring N in contact with the outer circumferential surface of the inner ring N and configured to apply a frictional force; and a cylindrical outer ring G into which the inner ring N to which the coil spring B is attached is inserted. The inner wheel N has a cylindrical shape, and the outer diameter thereof is larger than the diameter of the coil spring B in a free state (a state in which the spring is not acted on). An engagement portion K1 extending in the normal direction is formed at the tip end of the coil spring B in the center axis direction, and an engaged portion K2 engaged with the engagement portion K1 is formed on the inner peripheral surface of the outer ring G.
The assembly of such a torque limiter TL is generally performed as follows. First, the coil spring B is coated with a paste lubricant. Next, in a state where the coil spring B is fixed, the inner ring N is inserted into the coil spring B while the inner diameter of the coil spring B is enlarged by using an assembling apparatus provided with a dedicated slope jig, and the coil spring B is positioned at a predetermined position of the inner ring N. In this way, the coil spring B is attached to the outer peripheral surface of the inner ring N in contact with the outer peripheral surface of the inner ring N, and then detached from the attachment device. Then, the inner ring N to which the coil spring B is attached is inserted into the outer ring G so that the engaging portion K1 of the coil spring B is engaged with the engaged portion K2.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2008-274979
Patent document 2: japanese patent laid-open publication No. 2006 and 307934
Disclosure of Invention
Problems to be solved by the invention
As described above, the friction type torque limiter has the following problems because the inner ring N has a cylindrical shape and the outer diameter thereof is larger than the diameter of the coil spring B in the free state.
That is, when the coil spring B is attached to the inner ring N, the coil spring B is first attached to the outer circumferential surface of the inner ring N while the inner diameter of the coil spring B is expanded by using an attachment device provided with a dedicated slope jig in a state where the coil spring B is fixed. That is, when the coil spring B is attached, it is necessary to use an attachment device provided with a special jig, and it is necessary to take a lot of work to install the jig in the attachment device, or to install the coil spring B or the inner ring N in the attachment device. Generally, these operations are performed one by a worker through manual work, which causes an increase in manufacturing cost due to complication of the manufacturing process, a decrease in manufacturing efficiency, and the like.
The present invention addresses the problem of the above-described assembly method for a friction type torque limiter having a coil spring.
Means for solving the problems
The present invention in view of the above problems is as follows. The inner ring to which the coil spring is attached includes a large diameter portion, a small diameter portion formed on a tip end side of the large diameter portion, and a slope portion formed in a middle between the large diameter portion and the small diameter portion, and the slope portion is set such that a minimum diameter thereof is smaller than an inner diameter of the coil spring in a free state and a maximum diameter thereof is equal to a diameter of the large diameter portion.
That is, the present invention is characterized in that,
an "axial inner wheel; a coil spring attached to an outer peripheral surface of the inner ring in contact with the outer peripheral surface of the inner ring; and a cylindrical outer ring into which the inner ring to which the coil spring is attached is inserted,
the inner ring and the outer ring have a common center axis, the coil spring is engaged with the outer ring so as to be non-rotatable with respect to the outer ring,
when a rotational torque about the central axis is applied to relatively rotate the inner wheel and the outer wheel, if the rotational torque is greater than a predetermined value, the frictional force between the coil spring and the inner wheel is overcome to relatively rotate the outer wheel and the inner wheel,
the inner wheel has: a large diameter portion to which the coil spring is attached; a small diameter portion formed on a tip end side of the large diameter portion; and a slope portion formed between the large diameter portion and the small diameter portion,
the diameter of the large diameter portion is larger than the inner diameter of the coil spring in the free state, and the diameter of the small diameter portion is smaller than the inner diameter of the coil spring in the free state, and the slope portion is set to have a minimum diameter smaller than the inner diameter of the coil spring in the free state and a maximum diameter equal to the diameter of the large diameter portion.
ADVANTAGEOUS EFFECTS OF INVENTION
The torque limiter of the present invention comprises: a shaft-like inner wheel; a coil spring attached to an outer peripheral surface of the inner ring so as to be in contact with the outer peripheral surface of the inner ring; and a cylindrical outer ring into which an inner ring to which a coil spring is attached is inserted, the inner ring and the outer ring having a common central axis, the coil spring being engaged with the outer ring so as to be non-rotatable with respect to the outer ring, and the outer ring and the inner ring being relatively rotated against a frictional force between the coil spring and the inner ring when a rotational torque between the inner ring and the outer ring is larger than a predetermined value. These configurations are the same as those of the conventional torque limiter, but the inner ring of the torque limiter according to the present invention includes: a large diameter portion to which a coil spring is attached; a small diameter portion formed on the tip end side of the large diameter portion; and a slope portion formed between the large diameter portion and the small diameter portion, the slope portion being set to have a minimum diameter smaller than an inner diameter of the coil spring in a free state and a maximum diameter equal to a diameter of the large diameter portion.
In the torque limiter according to the present invention configured as described above, when the coil spring is attached to the inner race, the coil spring is fitted to the small diameter portion of the inner race and then the inner race is pressed in the direction of the small diameter portion, whereby the inner diameter of the coil spring is gradually enlarged by the slope portion of the inner race, and the coil spring is attached to the large diameter portion of the inner race. Therefore, when the coil spring is mounted to the inner wheel, the coil spring can be easily mounted to the inner wheel without using a mounting device provided with a special jig for expanding the diameter of the coil spring. Further, the coil spring can be attached to the inner ring not by manual work but by mechanical automation, so that the manufacturing cost can be reduced and the manufacturing efficiency can be increased dramatically.
Drawings
Fig. 1 is a structural diagram showing an embodiment of a torque limiter of the present invention.
Fig. 2 is a fragmentary view of the inner wheel of the torque limiter shown in fig. 1.
Fig. 3 is a fragmentary view of the outer wheel of the torque limiter shown in fig. 1.
Fig. 4 is a fragmentary view of the coil spring of the torque limiter shown in fig. 1.
Fig. 5 is a view illustrating a process of mounting a coil spring to an inner wheel in an assembling process of the torque limiter shown in fig. 1.
Fig. 6 is a view illustrating a process of assembling the inner ring and the outer ring to which the coil spring is attached in the process of assembling the torque limiter shown in fig. 1.
Fig. 7 is a diagram illustrating an operation of the paper feeding device provided with the torque limiter.
Fig. 8 is a diagram showing an example of a conventional friction type torque limiter.
Description of the reference numerals
1: torque limiter
2: inner wheel
21: large diameter part
22: small diameter part
23: slope-shaped part
24: step portion
25: stepped groove portion
3: outer wheel
314: third hollow part (rear hollow part)
315: fourth hollow part (front hollow part)
316: inward protrusion
4: spiral spring
5: spiral spring inserting jig
51: inner wheel inserting hole
6: inner wheel insertion jig
61: outer wheel inserting hole
Detailed Description
Hereinafter, a torque limiter according to the present invention will be described with reference to the drawings. In fig. 1, the overall construction of an embodiment of the torque limiter of the present invention is shown, with its component views shown in fig. 2 to 4. Fig. 5 and 6 are views for explaining a process of assembling the torque limiter according to the present invention.
As shown in fig. 1, the torque limiter of the present embodiment, which is denoted by reference numeral 1, includes an inner ring 2, an outer ring 3, and a coil spring 4. The inner ring 2 is inserted into the outer ring 3 with the coil spring 4 attached to the outer periphery thereof, and the inner ring 2 and the outer ring 3 have a common central axis o.
Referring to fig. 1 and 2, the inner ring 2 is in the shape of a shaft centered on a central axis o, and includes: a large diameter portion 21, a coil spring 4 attached to the large diameter portion 21: a small diameter portion 22 formed on the tip end side of the large diameter portion 21; and a slope portion 23 formed between the large diameter portion 21 and the small diameter portion 22. In the present embodiment, the inner wheel 2 is formed by forging.
The large-diameter portion 21 has a cylindrical shape, and the small-diameter portion 22 also has a cylindrical shape as a whole. The slope portion 23 has a truncated cone shape in which the cross-sectional diameter gradually decreases from the rear end to the front end, and the rear end thereof is continuously connected to the large diameter portion 21. Desirably, the slope portion 23 is not a straight line but a curved line on the upper and lower sides of the vertical cross-sectional shape including the central axis o. The diameter of the large diameter portion 21 is larger than the inner diameter of the coil spring 4 in the free state, and the diameter of the small diameter portion 22 is smaller than the inner diameter of the coil spring in the free state. The minimum diameter of the slope portion 23 is smaller than the inner diameter of the coil spring 4 in the free state, and the maximum diameter thereof is equal to the diameter of the large diameter portion 21.
In the illustrated embodiment, the diameter of the small diameter portion 22 is smaller than the minimum diameter of the slope portion 23, and the slope portion 23 and the small diameter portion 22 are connected by the step portion 24. A stepped groove portion 25 is formed at the tip end of the small diameter portion 22, and the stepped groove portion 25 is fitted into an inward projecting portion formed in the outer ring 3 described later. The stepped groove portion 25 is formed over the entire outer peripheral surface of the small-diameter portion 22. An annular flange 26 is formed at the rear end of the large diameter portion 21, and a connection portion 27 having a cylindrical shape and partially lacking is formed at the rear end.
Referring to fig. 1 and 3, the outer ring 3 is a cylindrical member having a center axis o as its center, and has a rear portion 31 having a large outer diameter and a front portion 32 having a small outer diameter. In the present embodiment, the outer ring 3 is formed by injection molding a thermoplastic resin such as polyacetal.
A first hollow portion 311 is formed inside the rear portion 31. The inner diameter of the first cavity 311 is sized to accommodate the annular flange 26 of the inner race 2. A second hollow portion 312 is formed in front of the first hollow portion 311. The second hollow portion 312 has an inner diameter smaller than that of the first hollow portion 311, and a ridge hollow portion 313 extending in the axial direction of the central axis o is provided above the second hollow portion 312.
A third hollow portion 314 is formed inside the front portion 32 of the outer ring 3, and a fourth hollow portion 315 is formed in front of the third hollow portion 314. The third hollow portion 314 and the fourth hollow portion 315 are cylindrical, and the third hollow portion 314 has an inner diameter equal to the large diameter portion 21 of the inner race 2, and the fourth hollow portion 315 has an inner diameter equal to the small diameter portion 22 of the inner race 2. Therefore, the large diameter portion 21 and the small diameter portion 22 of the inner ring 2 can be fitted into these hollow portions without a gap. An inward protrusion 316 that can be fitted into the stepped groove 25 of the inner ring 2 is formed on the inner circumferential surface of the front end of the fourth hollow 315.
As described with reference to fig. 1 and 4, the metal coil spring 4 is spirally wound around the central axis o, and an engagement portion 41 is formed at a tip end portion thereof, and the engagement portion 41 extends in a direction substantially perpendicular to the central axis o (i.e., in the winding direction) and in a direction away from the central axis o. It is preferable that the coil spring 4 is coated with a lubricant such as grease in advance.
The method of assembling the torque limiter 1 of the present invention will be described below with reference to fig. 1, 5, and 6.
First, the coil spring 4 is attached to the inner ring 2 using the coil spring insertion jig 5. As shown in fig. 5, the coil spring insertion jig 5 has a plurality of inner ring insertion holes 51 into which the small diameter portions 22 of the inner ring 2 can be inserted, and a coil spring installation portion 52 having an inner diameter slightly larger than that of the lower portion is coaxially formed at an upper portion of the inner ring insertion holes 51. When the coil spring 4 is attached to the inner wheel 2, first, the coil spring 4 is set in the coil spring setting portion 52 such that the engagement portion 41 is positioned downward (fig. 5 (a)). Although not shown, when the coil springs 4 are installed, another guide jig (tray) having guide holes penetrating vertically is used at positions corresponding to the inner race insertion holes 51, and slight vibration is applied thereto to align the coil springs 4 in a row and drop them into the coil spring installation portion 52.
The coil spring 4 is coated with a lubricant in advance, and grease diluted with a solvent can be used as the lubricant. The lubricant is in a liquid state, and a required amount of the lubricant can be applied to the plurality of coil springs 4 by one operation by charging the coil springs 4 into a container or the like filled with the lubricant. Therefore, compared with the prior art in which the paste-like lubricant is applied to the coil spring 4 one by hand, the operation efficiency can be greatly improved and excessive application of the lubricant can be prevented, contributing to reduction in material cost.
Next, the inner race 2 is inserted into the inner race insertion hole 51 from above the coil spring 4 with the tip end of the small diameter portion 22 being positioned below. As shown in fig. 5 (b), in this case, another guide jig having a guide hole penetrating vertically at a position corresponding to the inner ring insertion hole 51 is used, and slight vibration is applied thereto to align the inner rings 2 in a row and drop them into the inner ring insertion hole 51. In a state where the inner ring 2 is inserted into the inner ring insertion hole 51 from above the coil spring 4, the coil spring 4 is fitted to the inner ring 2 in a clearance fit state (state with a clearance) at a small diameter portion 22 having a diameter smaller than an inner diameter of the coil spring 4 in a free state.
Then, the inner ring 2 is pressed from above by an appropriate pressing machine such as a press machine (fig. 5 (c)). From a state where the coil spring 4 is fitted in a clearance fit state between the small diameter portion of the inner ring 2 and the inner ring 2, the coil spring 4 is moved to the large diameter portion 21 having a diameter larger than the inner diameter of the coil spring 4 in a free state while being gradually expanded by the slope portion 23 of the inner ring 2 by pressing the inner ring 2 from above, and the coil spring 4 is attached to the outer peripheral surface of the large diameter portion 21 of the inner ring 2 in contact with the outer peripheral surface of the large diameter portion 21 of the inner ring 2.
In the torque limiter 1 of the present invention, the coil spring 4 is provided at the upper portion of the coil spring insertion hole 51, and the inner ring 2 is inserted into the inner ring insertion hole 51 from above the coil spring 4, and then the inner ring 2 is pressed from above, whereby the coil spring 4 can be attached to the outer peripheral surface of the inner ring 2 in contact with the outer peripheral surface of the inner ring 2. When the coil spring 4 is attached to the inner wheel 2, it is not necessary to use a special jig for expanding the diameter of the coil spring 4, and the attaching and detaching operation of the jig in the conventional manual work can be omitted. Therefore, the coil spring 4 can be attached to the outer peripheral surface of the inner ring 2 by mechanical automation so that a plurality of attachments can be performed simultaneously, and the manufacturing efficiency can be increased dramatically.
After the coil spring 4 is mounted to the inner ring 2 in this manner, the outer ring 3 and the inner ring 2 to which the coil spring 4 is mounted are assembled by using the inner ring insertion jig 6. As shown in fig. 6, the inner wheel insertion jig 6 includes a plurality of outer wheel insertion holes 61 into which the outer wheels 3 can be inserted. When the outer ring 3 and the inner ring 2 to which the coil spring 4 is attached are assembled, first, the outer ring 3 is inserted into the outer ring insertion hole 61 with the tip of the front portion 32 of the outer ring 3 as a front end (fig. 6 (a)). Next, the inner ring 2 to which the coil spring 4 is attached is inserted into the outer ring 3 inserted into the outer ring insertion hole 61 with the tip end of the small diameter portion 22 being positioned downward (fig. 6 (b)). At this time, as in the case shown in fig. 5 (b), the inner ring 2 to which the coil spring 4 is attached is dropped by using another guide jig, not shown, in which a guide hole penetrating vertically is formed at a position corresponding to the outer ring insertion hole 61. When the inner ring 2 to which the coil spring 4 is attached is inserted into the outer ring 3, the engaging portion 41 of the coil spring 4 needs to be aligned with the protrusion hollow portion 313 formed in the second hollow portion 312 of the outer ring 3, but in the present embodiment, after the inner ring 2 to which the coil spring 4 is attached is inserted into the outer ring 3, a horizontal vibration is applied to the outer ring insertion hole 61 into which the outer ring 3 is inserted by an appropriate vibrator, and thereby the engaging portion 41 and the protrusion hollow portion 313 are relatively aligned.
After the inner ring 2 to which the coil spring 4 is attached is inserted into the outer ring 3, the inner ring 2 is pressed from above by using an appropriate pressing machine such as a press machine (fig. 6 (c)). Thus, the engagement portion 41 of the coil spring 4 is press-fitted into the rib cavity portion 313, and the inward protrusion 316 of the outer ring 3 is fitted into the stepped groove portion 25 of the inner ring 2, whereby the coil spring 4 is fixed to the outer ring 3, and the inner ring 2 is positioned in the axial direction with respect to the outer ring 3.
The operation of the torque limiter 1 of the present invention assembled as described above will be described with reference to fig. 1.
When a rotational torque (a torque in a direction to relax the tightening force of the coil spring 4) greater than a predetermined value is applied to the shaft around the center axis o that relatively rotates the inner ring 2 and the outer ring 3, the outer ring 3 and the inner ring 2 are relatively rotated against the frictional force between the coil spring 4 and the inner ring 2 due to the tightening force of the coil spring 4. At this time, the third hollow portion 314 has an inner diameter equal to the large diameter portion 21 of the inner race 2, and the fourth hollow portion 315 has an inner diameter equal to the small diameter portion 22 of the inner race 2, so that the rotational axes of the inner race 2 and the outer race 3 can be prevented from being shaken. Further, the stepped groove portion 25 is formed at the end portion of the small diameter portion 21 of the inner ring 2, and the inward protrusion portion 316 capable of fitting into the stepped groove portion 25 is formed on the outer ring 3, whereby the outer ring 3 which rotates is prevented from moving in the axial direction of the center axis o, and the relative rotation between the two is stabilized.
On the other hand, when the rotational torque for relative rotation of the inner ring 2 and the outer ring 3 is set to a predetermined value or less, relative rotation is not generated by the frictional force between the inner ring 2 and the coil spring 4. In addition, when the rotational torque is a torque in which the tightening force of the coil spring 4 is increased, the frictional force is increased, and therefore the inner ring 2 and the outer ring 3 are not relatively rotated.
As described above in detail, the inner race of the torque limiter of the present invention includes: a large diameter portion to which a coil spring is attached; a small diameter portion formed on the tip end side of the large diameter portion; and a slope portion formed between the large diameter portion and the small diameter portion, the slope portion being set to have a minimum diameter smaller than an inner diameter of the coil spring in a free state and a maximum diameter equal to a diameter of the large diameter portion. Therefore, the coil spring can be easily attached to the inner wheel without using a jig for expanding the diameter of the coil spring. In the above-described embodiment, the inner ring is produced by forging, but it is needless to say that it can be produced by sintering, pressing, or the like. In addition, although the method of assembling a plurality of torque limiters at the same time when assembling the torque limiters has been described above, it is clear that the above-described embodiment can be appropriately modified such as being assembled one by one.
Claims (7)
1. A method for mounting a torque limiter, wherein the torque limiter comprises: a shaft-like inner wheel; a coil spring attached to an outer peripheral surface of the inner ring in contact with the outer peripheral surface of the inner ring; and a cylindrical outer ring into which the inner ring to which the coil spring is attached is inserted,
the inner ring and the outer ring have a common center axis, the coil spring is engaged with the outer ring so as to be non-rotatable with respect to the outer ring,
when a rotational torque about the central axis is applied to relatively rotate the inner wheel and the outer wheel, if the rotational torque is greater than a predetermined value, the frictional force between the coil spring and the inner wheel is overcome to relatively rotate the outer wheel and the inner wheel,
the inner wheel has: a large diameter portion to which the coil spring is attached; a small diameter portion formed on a tip end side of the large diameter portion; and a slope portion formed between the large diameter portion and the small diameter portion,
the diameter of the large diameter portion is larger than the inner diameter of the coil spring in the free state, and the diameter of the small diameter portion is smaller than the inner diameter of the coil spring in the free state, and the slope portion is set such that the minimum diameter thereof is smaller than the inner diameter of the coil spring in the free state, and the maximum diameter thereof is equal to the diameter of the large diameter portion,
a method of mounting the torque limiter, in which the coil spring is mounted to the inner wheel, is characterized in that,
the coil spring is provided at an upper portion of a coil spring insertion jig having a plurality of inner ring insertion holes into which small diameter portions of the inner ring can be inserted, the inner ring is inserted into the inner ring insertion holes from above the coil spring, and then the inner ring is pressed from above, and the coil spring is attached to the large diameter portion of the inner ring while the coil spring is gradually expanded in diameter by a tapered portion of the inner ring.
2. The method of installing a torque limiter according to claim 1,
the diameter of the small diameter portion of the inner wheel is smaller than the minimum diameter of the slope portion, and the slope portion and the small diameter portion are connected by a step portion.
3. The method of mounting a torque limiter according to claim 1 or 2,
the outer wheel has: a rear cavity having an inner diameter equal to an outer diameter of the large diameter portion of the inner wheel; and a front hollow portion having an inner diameter equal to the outer diameter of the small-diameter portion of the inner wheel.
4. The method of mounting a torque limiter according to claim 1 or 2,
grease diluted with a solvent is applied to the coil spring.
5. The method of mounting a torque limiter according to claim 1 or 2,
a stepped groove portion is formed at a tip end portion of the small diameter portion of the inner ring, and an inward protrusion portion fitted into the stepped groove portion is formed at the outer ring.
6. A method of assembling a torque limiter, wherein the inner ring and the outer ring to which the coil spring is attached are assembled by the method of assembling a torque limiter according to any one of claims 1 to 5,
the outer ring is inserted into the outer ring insertion hole of an inner ring insertion jig having an outer ring insertion hole into which the outer ring can be inserted, and after the inner ring to which the coil spring is attached is inserted into the outer ring, the inner ring is pressed in the direction of the central axis, so that the inward protrusion of the outer ring is fitted into the stepped groove portion of the inner ring.
7. A method for assembling a torque limiter, wherein the torque limiter comprises: a shaft-like inner wheel; a coil spring attached to an outer peripheral surface of the inner ring in contact with the outer peripheral surface of the inner ring; and a cylindrical outer ring into which the inner ring to which the coil spring is attached is inserted,
the inner ring and the outer ring have a common center axis, the coil spring is engaged with the outer ring so as to be non-rotatable with respect to the outer ring,
when a rotational torque about the central axis is applied to relatively rotate the inner wheel and the outer wheel, if the rotational torque is greater than a predetermined value, the frictional force between the coil spring and the inner wheel is overcome to relatively rotate the outer wheel and the inner wheel,
the inner wheel has: a large diameter portion to which the coil spring is attached; a small diameter portion formed on a tip end side of the large diameter portion; and a slope portion formed between the large diameter portion and the small diameter portion,
the diameter of the large diameter portion is larger than the inner diameter of the coil spring in the free state, and the diameter of the small diameter portion is smaller than the inner diameter of the coil spring in the free state, and the slope portion is set such that the minimum diameter thereof is smaller than the inner diameter of the coil spring in the free state, and the maximum diameter thereof is equal to the diameter of the large diameter portion,
a step groove portion is formed at a tip end portion of the small diameter portion of the inner ring, and an inward protrusion portion fitted into the step groove portion is formed at the outer ring, and the method of assembling the torque limiter is a method of assembling the inner ring and the outer ring to which the coil spring is attached,
the coil spring is provided at an upper portion of a coil spring insertion jig having a plurality of inner ring insertion holes into which small diameter portions of the inner ring can be inserted, the inner ring is inserted into the inner ring insertion holes from above the coil spring, and then the inner ring is pressed from above, and the coil spring is attached to a large diameter portion of the inner ring while gradually expanding the diameter of the coil spring by a tapered portion of the inner ring,
the outer ring is inserted into the outer ring insertion hole of an inner ring insertion jig having a plurality of outer ring insertion holes into which the outer ring can be inserted, and after the inner ring to which the coil spring is attached is inserted into the outer ring, the inner ring is pressed in the direction of the central axis, so that the inward protrusions of the outer ring are fitted into the stepped groove portions of the inner ring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-071235 | 2015-03-31 | ||
| JP2015071235A JP6116608B2 (en) | 2015-03-31 | 2015-03-31 | Torque limiter manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106015375A CN106015375A (en) | 2016-10-12 |
| CN106015375B true CN106015375B (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610196345.8A Active CN106015375B (en) | 2015-03-31 | 2016-03-31 | Method for mounting torque limiter and method for assembling torque limiter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6116608B2 (en) |
| CN (1) | CN106015375B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004091109A (en) * | 2002-08-30 | 2004-03-25 | Canon Inc | Torque limiter and automatic paper feeder |
| JP2007010118A (en) * | 2005-07-04 | 2007-01-18 | Origin Electric Co Ltd | Torque utilized article |
| CN1945040A (en) * | 2005-10-05 | 2007-04-11 | Ntn株式会社 | Torque restrictor |
| CN1970706A (en) * | 2006-12-08 | 2007-05-30 | 鞍山海华油脂化学有限公司 | Open type gear lubricating grease |
| CN102433195A (en) * | 2011-10-24 | 2012-05-02 | 中国石油化工股份有限公司 | Open gear lubricating grease composition |
| JP5475918B1 (en) * | 2013-10-24 | 2014-04-16 | 株式会社東京鋲兼 | Torque hinge or torque limiter |
| CN103967968A (en) * | 2013-01-28 | 2014-08-06 | 欧利生电气株式会社 | Torque limiter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006307934A (en) * | 2005-04-27 | 2006-11-09 | Ntn Corp | Assembling method for torque limiter |
| JP2008215401A (en) * | 2007-02-28 | 2008-09-18 | Ntn Corp | Torque limiter |
-
2015
- 2015-03-31 JP JP2015071235A patent/JP6116608B2/en active Active
-
2016
- 2016-03-31 CN CN201610196345.8A patent/CN106015375B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004091109A (en) * | 2002-08-30 | 2004-03-25 | Canon Inc | Torque limiter and automatic paper feeder |
| JP2007010118A (en) * | 2005-07-04 | 2007-01-18 | Origin Electric Co Ltd | Torque utilized article |
| CN1945040A (en) * | 2005-10-05 | 2007-04-11 | Ntn株式会社 | Torque restrictor |
| CN1970706A (en) * | 2006-12-08 | 2007-05-30 | 鞍山海华油脂化学有限公司 | Open type gear lubricating grease |
| CN102433195A (en) * | 2011-10-24 | 2012-05-02 | 中国石油化工股份有限公司 | Open gear lubricating grease composition |
| CN103967968A (en) * | 2013-01-28 | 2014-08-06 | 欧利生电气株式会社 | Torque limiter |
| JP5475918B1 (en) * | 2013-10-24 | 2014-04-16 | 株式会社東京鋲兼 | Torque hinge or torque limiter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6116608B2 (en) | 2017-04-19 |
| CN106015375A (en) | 2016-10-12 |
| JP2016191414A (en) | 2016-11-10 |
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