EP0000212A1 - Rotary shear pin coupling - Google Patents
Rotary shear pin coupling Download PDFInfo
- Publication number
- EP0000212A1 EP0000212A1 EP78200020A EP78200020A EP0000212A1 EP 0000212 A1 EP0000212 A1 EP 0000212A1 EP 78200020 A EP78200020 A EP 78200020A EP 78200020 A EP78200020 A EP 78200020A EP 0000212 A1 EP0000212 A1 EP 0000212A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupling
- shear pin
- shear
- pin
- coupling member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- 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
- F16D9/00—Couplings with safety member for disconnecting, e.g. breaking or melting member
- F16D9/06—Couplings with safety member for disconnecting, e.g. breaking or melting member by breaking due to shear stress
- F16D9/10—Couplings with safety member for disconnecting, e.g. breaking or melting member by breaking due to shear stress having a part movable after disconnection so as to provide reconnection, e.g. advanceable shear pins
Definitions
- the coupling is capable of traansmitting a high torque and provides protection from overload for a long- time, without needing to renew shear pins after each overloed.
- the shear pin coupling 1 comprises a first coupling member 2, which is mounted on a driving shaft 3, which may, for example, be the power take-off shaft of a tractor.
- the shear pin coupling also comprises a second coupling member 4, which has, on the side facing away from the first coupling member 2, fork prongs 6 of a universal coupling.
- This coupling may, for example, be one of a set of universal couplings of an auxiliary shuft (not shown), as is convem- tionally, employed between a power take-off shaft of a tractor and an input or driven shaft of an agricultural implement.
- the first coupling member 2 comprises a circular flange 6 (see Figure 3) and is provided on the side facing away from the coupling member 4 with a cylindrical boss 7.
- the boss 7 has at least one radial bore accommodating a ball 8, which is urged radially inwardly by a set screw 9 having a comical end into a groove 11 in the driving shaft 3. In this way the coupling is axially firmly connected with the driving shaft 3.
- the driving shaft 3 is provided with splines 12 which co-operate with corresponding splines in the first coupling member 2 to couple the driving shaft 3 and the first coupling member 2 for rotation together.
- the flange 6 On the side facing the second coupling member 4 the flange 6 has one or more (in this embodiment, twelve) guide slots 13 extending; radially from near the shaft to the periphery of the flunge 6.
- Each slot 13 is substantiall rectangular in tangential cross-section.
- the coupling member 2 also comprises a comparatively thin, circular disc 14, which has, near the shaft 3, a hub 15.
- the hub 15 fits coaxially with- sure pin 38 each have a rectangular cross-section to match that of the slot 13.
- the pins 36 in the slot 13 preferably extend axially with respect to the rotary axis 3A.
- Each slot 13 may contain about 3 to 6 pins; in this embodiment, they each contain 4 pins.
- the shear pin coupling described above operates as follows. During operation the shear pin coupling is provided between the output shaft of a power source and the shaft of mechanism to be driven.
- the shear pin coupling may be employed in many different situations, but in this embodiment it is arranged in the end portion of an auxiliary shaft ha- ving two universal couplings, in which, as stated above, the first coupling member 2 is connected with the power take-off shaft 3 of a tractor (not shown).
- the two coupling members 2 and 4 are interconnected for rotation together by a shear pin 36A.
- this shear pin 36A which is disposed in the first coupling member 2 about the rear sidewall of the opening 18, as viewed in the direction of rotation A, this side wall ensuring by its concave shape a satisfactory transfer of forces from the sidewall to the adjacent part of the shear pin 36A.
- This part of the shear pin is retained against radially outward movement by the part 32 of the cover plate 30.
- the part of the shear pin 36A which is located in the second coupling member 4 lies in the opening 29 and is in contact with the leading sidewall of the opening 29, as viewed in the direction of rotation A, this sidewall comprising the side of the cutting plate 27, the surface of this side also matching the cylindrical surface of the shear pin.
- the length of the shear pin 36A is located in the opening 18 and the other two thirds are located in the opening 29.
- the openings 18 and 19 have, as viewed in a tangential direction, a larger dimension than the diameter of the shear pins 36 and 36A. This excess is preferably about 405.
- the part of the shear pin located in the opening 29 is not covered by the cover plate 30.
- the length of the openings 18 and 29 is only slightly larger than the axial length of the shear pins 36 and 36A respectively.
- the cutting plate produces a sharply defined fracture and prevents damage of the rim 25, whilst damage of the ring 17 can be avoided by lading it from hardened material.
- the coupling; mon- bor 4 will colle to a standstill, whilst the broken-off part of the shear pin 36A located in the opening 29 can emerge unhindered in a radial direction, The part of the shear pin remaining in the opening 18 will continue rotating with the first coupling member 2, which rotation results in relative rotation between the two coupling members 2 and 4.
- the critical speed at which the spring is capable of displacing a new shear pin into a new connecting position is preferably chosen so that this speed is below the minimum speed of the power take-off shaft corresponding to idling of the driving engine.
- this critical speed at which the connection is re-established. may be about 150 revolutions per minute.
- the movement of a shear pin into a new connecting position is limited in a radial direction by the part 32 of the cover plate 30 forming a stop. After the coupling is re-established, the shear pin coupling is again capable of transferring the driving power. In this way the construction according to the invention pre- vides protection from overload for a long time without nead- be filled by removing the cover plate-30.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
- Agricultural Machines (AREA)
- Transmission Devices (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
Description
-
- In this way the coupling is capable of traansmitting a high torque and provides protection from overload for a long- time, without needing to renew shear pins after each overloed.
- For a better understanding of the present invention and to show how it may be carried into effect, reference will no be made, by way of example only, to the accompanying drawings in which:
- Figure 1 is an elevational view of a shear pin coupling
- Figure 2 is a sectional view taken on the line II-II in Figure 1;
- Figure 3 is a sectional view taken on the lines III-III in Figure 2;
- Figure 4 is a sectional view taken on the lines IV-IV in Figure 2;
- Figure 5 is an elevational view taken in the direction of the arrow V in Figure 2;
- Figure 6 is an exploded elevational view showing some component parts of the coupling of Figure 1 to 5; and
- Figure 7 is an elevational view of a component part of the coupling in the direction of the arrow VII in Figure 6.
- As shown in Figure 1, the
shear pin coupling 1 comprises afirst coupling member 2, which is mounted on adriving shaft 3, which may, for example, be the power take-off shaft of a tractor. The shear pin coupling also comprises asecond coupling member 4, which has, on the side facing away from thefirst coupling member 2,fork prongs 6 of a universal coupling. This coupling may, for example, be one of a set of universal couplings of an auxiliary shuft (not shown), as is convem- tionally, employed between a power take-off shaft of a tractor and an input or driven shaft of an agricultural implement. Thefirst coupling member 2 comprises a circular flange 6 (see Figure 3) and is provided on the side facing away from thecoupling member 4 with acylindrical boss 7. Theboss 7 has at least one radial bore accommodating a ball 8, which is urged radially inwardly by a set screw 9 having a comical end into agroove 11 in the drivingshaft 3. In this way the coupling is axially firmly connected with thedriving shaft 3. The drivingshaft 3 is provided withsplines 12 which co-operate with corresponding splines in thefirst coupling member 2 to couple thedriving shaft 3 and thefirst coupling member 2 for rotation together. On the side facing thesecond coupling member 4 theflange 6 has one or more (in this embodiment, twelve)guide slots 13 extending; radially from near the shaft to the periphery of theflunge 6. Eachslot 13 is substantiall rectangular in tangential cross-section. Thecoupling member 2 also comprises a comparatively thin,circular disc 14, which has, near theshaft 3, ahub 15. Thehub 15 fits coaxially with-sure pin 38 each have a rectangular cross-section to match that of theslot 13. Thepins 36 in theslot 13 preferably extend axially with respect to therotary axis 3A. Eachslot 13 may contain about 3 to 6 pins; in this embodiment, they each contain 4 pins. - The shear pin coupling described above operates as follows. During operation the shear pin coupling is provided between the output shaft of a power source and the shaft of mechanism to be driven. The shear pin coupling may be employed in many different situations, but in this embodiment it is arranged in the end portion of an auxiliary shaft ha- ving two universal couplings, in which, as stated above, the
first coupling member 2 is connected with the power take-off shaft 3 of a tractor (not shown). The twocoupling members shear pin 36A. The part of thisshear pin 36A which is disposed in thefirst coupling member 2 about the rear sidewall of theopening 18, as viewed in the direction of rotation A, this side wall ensuring by its concave shape a satisfactory transfer of forces from the sidewall to the adjacent part of theshear pin 36A. This part of the shear pin is retained against radially outward movement by thepart 32 of thecover plate 30. The part of theshear pin 36A which is located in thesecond coupling member 4 lies in the opening 29 and is in contact with the leading sidewall of theopening 29, as viewed in the direction of rotation A, this sidewall comprising the side of thecutting plate 27, the surface of this side also matching the cylindrical surface of the shear pin. Preferably about one third of the length of theshear pin 36A is located in the opening 18 and the other two thirds are located in the opening 29. Theopenings shear pins cover plate 30. As viewed in an axial direction, the length of theopenings shear pins shear pin 36 the cutting plate produces a sharply defined fracture and prevents damage of therim 25, whilst damage of thering 17 can be avoided by lading it from hardened material. After fracture of theshear pin 36A the coupling; mon-bor 4 will colle to a standstill, whilst the broken-off part of theshear pin 36A located in the opening 29 can emerge unhindered in a radial direction, The part of the shear pin remaining in the opening 18 will continue rotating with thefirst coupling member 2, which rotation results in relative rotation between the twocoupling members cover plate 30 so that the shear pin part can be ejected from the opening 18. This ejection is facilitated by the centrifugal force exerted on the shear pin. J oreover, since therin 25 and themain portion 20 are a small distance apart from one another, any uneven fracture between the two parts of the broken-down shear pin should not result in jamming. Therecess 22 located behind theopening 18, as viewed in the direction of rotation A, further facilitates the escape of the shear pin part. After the broken parts of the shear pin have been removed from theopenings shear pin 36 can move out of one of theslots 13 into a position for connecting the two coupling members. However, with the conventional speed of the power take-off shaft, which is about 540 rev/min. it is not possible for the next shear pin to be urged in a radial outward direction. This is because the tangential dimension of theopening 29 is intentionally chosen so that the sum of the force of the spring 35 and the centrifugal force exerted on the row of shear pins is not sufficient, at the normal operating speed of the power take-off shaft, to give the shear pin, having a known mass, an acceleration, sufficient to bridge the distance between the original position and the connecting position during the instant when theopening 29 is in register with theopening 10. It is important for the spring force to diminish proportionally to the reduced total mass of the row of shear pine as the shear pins are used up. The critical speed at which the spring is capable of displacing a new shear pin into a new connecting position is preferably chosen so that this speed is below the minimum speed of the power take-off shaft corresponding to idling of the driving engine. With a Diesel engine for example, this critical speed at which the connection is re-established. may be about 150 revolutions per minute. The movement of a shear pin into a new connecting position is limited in a radial direction by thepart 32 of thecover plate 30 forming a stop. After the coupling is re-established, the shear pin coupling is again capable of transferring the driving power. In this way the construction according to the invention pre- vides protection from overload for a long time without nead-be filled by removing the cover plate-30. By turning therim 25 with respect to themain portion 20 the opening 29 can be brought into register with all of theopenings 18 in suc=. cession, so that the shear pins can be inserted into theslots 13. After all the slots have been filled and thecover plate 30 is refitted, theshear pin coupling 1 is again ready for use. -
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7706801 | 1977-06-21 | ||
NL7706801A NL7706801A (en) | 1977-06-21 | 1977-06-21 | BREAKPOINT CLUTCH. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000212A1 true EP0000212A1 (en) | 1979-01-10 |
EP0000212B1 EP0000212B1 (en) | 1981-02-25 |
Family
ID=19828756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19780200020 Expired EP0000212B1 (en) | 1977-06-21 | 1978-06-01 | Rotary shear pin coupling |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0000212B1 (en) |
DE (1) | DE2826334A1 (en) |
FR (1) | FR2395427A1 (en) |
NL (1) | NL7706801A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2060814A1 (en) * | 2006-09-06 | 2009-05-20 | Sanden Corporation | Power transmission device |
EP3828431A1 (en) * | 2019-11-26 | 2021-06-02 | Christian Maier GmbH & Co. KG Maschinenfabrik | Rotary feed-through |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1090975B (en) * | 1957-02-25 | 1960-10-13 | Gelenkwellenbau Gmbh | Safety clutch, especially for power take-offs on motor vehicles |
US3049898A (en) * | 1961-03-15 | 1962-08-21 | Copolymer Rubber & Chem Corp | Apparatus for transmitting rotary motion |
DE1140770B (en) * | 1961-10-09 | 1962-12-06 | Bodenbearbeitungsgeraete Veb | Overload protection with shear pin for agricultural machinery and equipment, especially plows |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL154389B (en) * | 1967-09-20 | 1977-09-15 | Lely Nv C Van Der | MIDDLE SHAFT WITH OVERLOAD CLUTCH. |
NL7701013A (en) * | 1977-02-01 | 1978-08-03 | Lely Nv C Van Der | OVERLOAD PROTECTION DEVICE. |
NL7701012A (en) * | 1977-02-01 | 1978-08-03 | Lely Nv C Van Der | DRIVE SHAFT. |
NL182503C (en) * | 1976-11-01 | 1988-03-16 | Lely Nv C Van Der | AUTOMATIC BREAKER COUPLING. |
NL7704935A (en) * | 1977-05-05 | 1978-11-07 | Lely Nv C Van Der | FLYWHEEL. |
-
1977
- 1977-06-21 NL NL7706801A patent/NL7706801A/en not_active Application Discontinuation
-
1978
- 1978-06-01 EP EP19780200020 patent/EP0000212B1/en not_active Expired
- 1978-06-14 FR FR7817731A patent/FR2395427A1/en active Pending
- 1978-06-16 DE DE19782826334 patent/DE2826334A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1090975B (en) * | 1957-02-25 | 1960-10-13 | Gelenkwellenbau Gmbh | Safety clutch, especially for power take-offs on motor vehicles |
US3049898A (en) * | 1961-03-15 | 1962-08-21 | Copolymer Rubber & Chem Corp | Apparatus for transmitting rotary motion |
DE1140770B (en) * | 1961-10-09 | 1962-12-06 | Bodenbearbeitungsgeraete Veb | Overload protection with shear pin for agricultural machinery and equipment, especially plows |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2060814A1 (en) * | 2006-09-06 | 2009-05-20 | Sanden Corporation | Power transmission device |
EP2060814A4 (en) * | 2006-09-06 | 2009-08-26 | Sanden Corp | Power transmission device |
EP2302244A1 (en) * | 2006-09-06 | 2011-03-30 | Sanden Corporation | Power transmission device |
EP3828431A1 (en) * | 2019-11-26 | 2021-06-02 | Christian Maier GmbH & Co. KG Maschinenfabrik | Rotary feed-through |
Also Published As
Publication number | Publication date |
---|---|
NL7706801A (en) | 1978-12-27 |
EP0000212B1 (en) | 1981-02-25 |
DE2826334A1 (en) | 1979-01-11 |
FR2395427A1 (en) | 1979-01-19 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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