CA1251660A - Spacer for transmission shaft - Google Patents
Spacer for transmission shaftInfo
- Publication number
- CA1251660A CA1251660A CA000485935A CA485935A CA1251660A CA 1251660 A CA1251660 A CA 1251660A CA 000485935 A CA000485935 A CA 000485935A CA 485935 A CA485935 A CA 485935A CA 1251660 A CA1251660 A CA 1251660A
- Authority
- CA
- Canada
- Prior art keywords
- spacer
- shaft
- bearings
- body portion
- rotatable
- 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.)
- Expired
Links
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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
- F16H57/022—Adjustment of gear shafts or bearings
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
- F16H2057/02047—Automatic transmissions
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
- F16H2057/02052—Axle units; Transfer casings for four wheel drive
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
- Gears, Cams (AREA)
- Gear Transmission (AREA)
- Structure Of Transmissions (AREA)
Abstract
Title Spacer for Transmission Shaft Abstract of the Invention An improved spacer for a transmission gear shaft facilitates axial locations of pairs of gears or bearings along the shaft. In a preferred form the spacer comprises an open coil member which defines a helicoidal body portion resiliently disposed between a pair of bearings. In addition to axially locating the bearings relative to one another, the helicoidal body portion facilitates the flow of splash and spray oil along the shaft between the bearings. In the same preferred form, the spacer is made of a non-heat treated high carbon spring steel.
Description
$
Title Spacer for Transmission Shaft Back~round of the Invention This invention relates ~o spacer members positioned on transmission gear shafts for axially locating gears and bearings. The majority of standard or manually shifted transmissions are internally lubricated by "splash and spray" oil, whereby rotatiny members within the transmission housing extend into an oil sump at the bottom of the transmission housing and disperse oil over the internals of the transmission. Numerous efforts have been made to achieve satisfactory oil dispersions within the transmission housing; one of the more noteworthy being the use of troughs which receive oil thrown randomly for redirecting same to specific locations within the housing. One particular location of critical importance, for example, is the transmission pocket bearing. Another of such locations is the reverse idler shaft which is typically non-rotatable, but carries a reverse idler gear rotatable thereabout on needle bearings interposed between gear and shaft members.
~rypically, two such sets of needle bearings are utilized to support the rotation of the reverse idler gear. A spacer member is positioned between the sets of needle bearings to first axially locate the bearings, and then to insure proper rotational position of the bearings during operation. Typical spacers are generally tubular in design, and operate only to hold the bearings apart, providing no facilitation of lubrication of the bearingsO
~ ~ y~
Summary of he Invention The transmission gear shaft spacer disclosed herein provides a system whereby a flow of splash and spray oil along the shaft between the bearings is facilitated. In a preferred form, the spacer has squared ends which engage a pair of bearings supporting a rotatable reverse idler gear on a non-rotatable shaft. The spacer defines a helicoidal body of an open coil configuration, the squared ends providing radially uniform support surfaces resiliently disposed between the bearingsO In a preferred form the helicoidal body is of a non-heat treated high carbon steel.
A second embodiment of a transmission gear shaft spacer defines a helicoidal body of a closed coil configuration disposed tightly between a pair of gears radially fixed to a gear shaftO The spacer provides axial positioning of the gears with respect to one another. The ends of the spacer are also squared in the second preferred form.
Brief Description of the Drawings Figure l is a cross sectional view of a transmission which employs two alternate preferred embodiments of the spacer of the present invention.
Figure 2 is an isolated side view, partly in section and in a free standing mode, of one of the preferred émbodiments shown in Figure l.
Figure 3 is a side view, also in a free standing mode, of the other preferred embodiment shown in Figure l.
Detail _ Description of Preferred Embodimen~s Referring initially to Figure l, a sectional view of a transmission lO includes two separate alternate emobidments of s~acers made in accordance with this invention at 20 and 30, respectively. The transmission lO embodies a relatively standard configuration of manually shifted gears, the gears 5 ~.~; &'D
positioned on a mainshaft 8, a countershaft 14 and a non-rotatable reverse idler shaft 12. Each of the two spacers circumferentially encases a portion of a transmission gear shaft. The spacer 20 is of an open coil configuration, and circumferentially encases the reverse idler shat 12, while the closed coil spacer 30 encases the countershaft 14.
The open coil spacer 20 is axially interposed on the reverse idler shaft 12 between a parallel ~et of bearings 16 and 18. In the preferred embodiment, the bearings are needle bearings, although the spacer of the invention described herein is suitable for use with other types or styles of bearings as well. The bearings 16 and 18 support a reverse idler gear 22, for rotation thereo about the reverse idler shaft 12 on the bearings 16 and 18.
Referring now particularly to Figure 2, the open coil spacer 20 defines a helicoidally shaped body portion 24, and has first and second squared ends 26 and 28, respectively. The squared ends 26 and 28 provide for radially uniform resilient support surfaces for contact with opposing inner ends 36 and 38 of respective bearings 16 and 18. In the preferred embodiment, the shaft will have an outside diameter slightly less than the inside diameter of the spacer. To the extent that the spacer is situated between the bearings 16 and 18, it will tend to rotate about the idler shaft 12 by virtue of friction drag forces imposed on the spacer ends 26 and 28 during rotation of the bearing inner ends 36 and 38 about the shaft 12. ThuS the needle bearings 16 and 18 will frictionally cause the spacer 20 to `rotate about the stationary reverse idler shaft 120 The resultant rotational movement of the helicoidal body portion 24 of the spacer 20 will produce an axial oil movement along the shaft 12 to facilitate lubrication of the needle bearings 16 and 18, which are not exposed directly to the splash and spray oil environment wi~hin the transmission 10.
It should be noted that the open coil spacer 20 may be disposed between the bearings 16 and 18 under a slight load thus under a pre-loaded condition. It is suggested that the latter would insure continuous rotational movement of the spacer with the bearings about the non-rotatin~ shaft 12. On the other hand, the spacer will move with the bearings without such pre-load, and even if there is slight axial floating of the spacer between the bearings by virtue of viscous drag forces imposed on the spacer due to surface tension of the oil.
An alternate preferred emboidment of the spacer of the present invention is shown at 30 in Figure 3.
The spacer 30, however, is positioned (see Figure 1) between a pair of gears 32 and 34 located on the countershaft 14. The gears 32 and 34 are keyed radially to the shaft 14, and the spacer insures the axial position of the gears with respect to one another on the shaft~ Similarly to the ends 26 and 28 of the spacer 20, the ends 26' and 28' of the spacer 30 are squared for establishing a radially uniform support surface for contact with each of the gears. In this case, however, the contact is not resilient as there is no need for preloading of the sides of the gears 32 and 34.
It will be appreciated by those skilled in the art that the countershaft 14 is a rotatable shaft, and as a result will rotate the spacer member 30.
The member 30 i5 fully exposed to the splash and spray oil environment within the transmission body.
Those skilled in the art will appreciate the fact that the helicoidal body portion 24' of the spacer 30 will tend to cause oil slung away from the spacer to ~r~ L6~
have a slight axial, as opposed to fully radial, component. As a result, the closed coil spacer 30 may be employed to enhance the oil dispersion within the transmission body by distributing the oil in a more desirable spray pattern~ Again, in a preferred form, the spacer 30 is made of non-heat treated high carbon spring steel.
Although only two preferred embodiments of the spacer of the present invention have been described and shown herein, there are many variations of the invention which will fall within the scope o the following apended claims.
Title Spacer for Transmission Shaft Back~round of the Invention This invention relates ~o spacer members positioned on transmission gear shafts for axially locating gears and bearings. The majority of standard or manually shifted transmissions are internally lubricated by "splash and spray" oil, whereby rotatiny members within the transmission housing extend into an oil sump at the bottom of the transmission housing and disperse oil over the internals of the transmission. Numerous efforts have been made to achieve satisfactory oil dispersions within the transmission housing; one of the more noteworthy being the use of troughs which receive oil thrown randomly for redirecting same to specific locations within the housing. One particular location of critical importance, for example, is the transmission pocket bearing. Another of such locations is the reverse idler shaft which is typically non-rotatable, but carries a reverse idler gear rotatable thereabout on needle bearings interposed between gear and shaft members.
~rypically, two such sets of needle bearings are utilized to support the rotation of the reverse idler gear. A spacer member is positioned between the sets of needle bearings to first axially locate the bearings, and then to insure proper rotational position of the bearings during operation. Typical spacers are generally tubular in design, and operate only to hold the bearings apart, providing no facilitation of lubrication of the bearingsO
~ ~ y~
Summary of he Invention The transmission gear shaft spacer disclosed herein provides a system whereby a flow of splash and spray oil along the shaft between the bearings is facilitated. In a preferred form, the spacer has squared ends which engage a pair of bearings supporting a rotatable reverse idler gear on a non-rotatable shaft. The spacer defines a helicoidal body of an open coil configuration, the squared ends providing radially uniform support surfaces resiliently disposed between the bearingsO In a preferred form the helicoidal body is of a non-heat treated high carbon steel.
A second embodiment of a transmission gear shaft spacer defines a helicoidal body of a closed coil configuration disposed tightly between a pair of gears radially fixed to a gear shaftO The spacer provides axial positioning of the gears with respect to one another. The ends of the spacer are also squared in the second preferred form.
Brief Description of the Drawings Figure l is a cross sectional view of a transmission which employs two alternate preferred embodiments of the spacer of the present invention.
Figure 2 is an isolated side view, partly in section and in a free standing mode, of one of the preferred émbodiments shown in Figure l.
Figure 3 is a side view, also in a free standing mode, of the other preferred embodiment shown in Figure l.
Detail _ Description of Preferred Embodimen~s Referring initially to Figure l, a sectional view of a transmission lO includes two separate alternate emobidments of s~acers made in accordance with this invention at 20 and 30, respectively. The transmission lO embodies a relatively standard configuration of manually shifted gears, the gears 5 ~.~; &'D
positioned on a mainshaft 8, a countershaft 14 and a non-rotatable reverse idler shaft 12. Each of the two spacers circumferentially encases a portion of a transmission gear shaft. The spacer 20 is of an open coil configuration, and circumferentially encases the reverse idler shat 12, while the closed coil spacer 30 encases the countershaft 14.
The open coil spacer 20 is axially interposed on the reverse idler shaft 12 between a parallel ~et of bearings 16 and 18. In the preferred embodiment, the bearings are needle bearings, although the spacer of the invention described herein is suitable for use with other types or styles of bearings as well. The bearings 16 and 18 support a reverse idler gear 22, for rotation thereo about the reverse idler shaft 12 on the bearings 16 and 18.
Referring now particularly to Figure 2, the open coil spacer 20 defines a helicoidally shaped body portion 24, and has first and second squared ends 26 and 28, respectively. The squared ends 26 and 28 provide for radially uniform resilient support surfaces for contact with opposing inner ends 36 and 38 of respective bearings 16 and 18. In the preferred embodiment, the shaft will have an outside diameter slightly less than the inside diameter of the spacer. To the extent that the spacer is situated between the bearings 16 and 18, it will tend to rotate about the idler shaft 12 by virtue of friction drag forces imposed on the spacer ends 26 and 28 during rotation of the bearing inner ends 36 and 38 about the shaft 12. ThuS the needle bearings 16 and 18 will frictionally cause the spacer 20 to `rotate about the stationary reverse idler shaft 120 The resultant rotational movement of the helicoidal body portion 24 of the spacer 20 will produce an axial oil movement along the shaft 12 to facilitate lubrication of the needle bearings 16 and 18, which are not exposed directly to the splash and spray oil environment wi~hin the transmission 10.
It should be noted that the open coil spacer 20 may be disposed between the bearings 16 and 18 under a slight load thus under a pre-loaded condition. It is suggested that the latter would insure continuous rotational movement of the spacer with the bearings about the non-rotatin~ shaft 12. On the other hand, the spacer will move with the bearings without such pre-load, and even if there is slight axial floating of the spacer between the bearings by virtue of viscous drag forces imposed on the spacer due to surface tension of the oil.
An alternate preferred emboidment of the spacer of the present invention is shown at 30 in Figure 3.
The spacer 30, however, is positioned (see Figure 1) between a pair of gears 32 and 34 located on the countershaft 14. The gears 32 and 34 are keyed radially to the shaft 14, and the spacer insures the axial position of the gears with respect to one another on the shaft~ Similarly to the ends 26 and 28 of the spacer 20, the ends 26' and 28' of the spacer 30 are squared for establishing a radially uniform support surface for contact with each of the gears. In this case, however, the contact is not resilient as there is no need for preloading of the sides of the gears 32 and 34.
It will be appreciated by those skilled in the art that the countershaft 14 is a rotatable shaft, and as a result will rotate the spacer member 30.
The member 30 i5 fully exposed to the splash and spray oil environment within the transmission body.
Those skilled in the art will appreciate the fact that the helicoidal body portion 24' of the spacer 30 will tend to cause oil slung away from the spacer to ~r~ L6~
have a slight axial, as opposed to fully radial, component. As a result, the closed coil spacer 30 may be employed to enhance the oil dispersion within the transmission body by distributing the oil in a more desirable spray pattern~ Again, in a preferred form, the spacer 30 is made of non-heat treated high carbon spring steel.
Although only two preferred embodiments of the spacer of the present invention have been described and shown herein, there are many variations of the invention which will fall within the scope o the following apended claims.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A spacer disposed for circumferentially encasing a non-rotatable transmission gear shaft, said spacer comprising a helicoidal body portion defining an open coil, said body portion having ends resiliently disposed between a pair of bearings rotatably supported on said shaft, said bearings supporting a gear rotatable about said non-rotatable shaft, said body portion being radially encased by said gear, said body portion causing a unidirec-tional axial flow of splash and spray oil along said shaft between said rotating bearings thereby defining an axial flow pumping means, said ends of said coil being squared and defining radially uniform resilient support surfaces for contact with opposing ends of said bearings, said shaft having an outside diameter slightly less than the inside diameter of the spacer, whereby as said bearings rotate about said non-rotatable shaft, said spacer rotates about said shaft with said bearings.
2. The spacer of Claim 1 wherein said ends are squared for establishing a radially uniform support surface for contact with each of said bearings.
3. The spacer of Claim 1 wherein said shaft is a non-rotatable reverse idler shaft, and wherein the shaft contains a rotatable gear supported on said non-rotatable shaft radially outwardly of said spacer, whereby said splash and spray oil is urged through the bearings disposed either side of said spacer by said helicoidal body portion of said spacer.
4. The spacer of Claim 3 wherein said gear shaft has an outside diameter less than the inside diameter of the spacer.
5. The spacer of Claim 3 wherein said helicoidal body portion is a non-heat treated, high carbon spring steel.
6. The spacer of Claim 5 wherein said squared ends are disposed for making resilient contact with needle bearings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US62714984A | 1984-07-02 | 1984-07-02 | |
| US627,149 | 1984-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1251660A true CA1251660A (en) | 1989-03-28 |
Family
ID=24513399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000485935A Expired CA1251660A (en) | 1984-07-02 | 1985-06-28 | Spacer for transmission shaft |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS6127338A (en) |
| KR (1) | KR860001302A (en) |
| AU (1) | AU589127B2 (en) |
| BR (1) | BR8503123A (en) |
| CA (1) | CA1251660A (en) |
| DE (1) | DE3523292A1 (en) |
| FR (1) | FR2568960B1 (en) |
| GB (1) | GB2161245B (en) |
| IT (1) | IT1200086B (en) |
| MX (1) | MX163007B (en) |
| NL (1) | NL8501753A (en) |
| SE (1) | SE458556B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030029272A (en) * | 2001-10-05 | 2003-04-14 | 문선모 | Polymer foam Resin improved flammability by treatment of inorganic material. |
| TWI385182B (en) | 2004-03-15 | 2013-02-11 | Jsr Corp | Conjugated diene (co) poly rubber and method for producing the same |
| KR20100015342A (en) | 2007-03-15 | 2010-02-12 | 제이에스알 가부시끼가이샤 | Conjugated diolefin copolymer rubber, method for producing the same, rubber composition and tire |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202109C (en) * | ||||
| GB729455A (en) * | 1951-12-22 | 1955-05-04 | Ulvsunda Verkst Er Aktiebolag | Improvements in bearing devices for high speed spindles |
| US3017230A (en) * | 1957-08-22 | 1962-01-16 | Garrett Corp | Lubrication system |
| US2935889A (en) * | 1957-11-12 | 1960-05-10 | Allis Chalmers Mfg Co | Lubrication of transmission clutch disks |
| GB918875A (en) * | 1960-11-09 | 1963-02-20 | Filton Ltd | Improvements in and relating to a collar for holding an annular bearing or sealing surface rotatively fast with a shaft |
| US3109317A (en) * | 1961-12-01 | 1963-11-05 | Chrysler Corp | Countershaft gearing noise eliminator |
| US3213645A (en) * | 1963-09-03 | 1965-10-26 | Xerox Corp | Torque limiting mechanism |
| FR2045063A5 (en) * | 1969-05-30 | 1971-02-26 | Bayard Gaston | |
| US3602010A (en) * | 1969-06-04 | 1971-08-31 | New Hudson Corp | Shaft coupling means for high temperature rolls and the like |
| IT1028288B (en) * | 1975-01-10 | 1979-01-30 | Nuovo Pignone Spa | BUSHING SYSTEM WITH ZERO CLEARANCE TO SUPPORT SEALING IN A ROTABLE BUT NOT TRANSFERABLE WAY, PINS, SHAFTS AND SIMILAR ARTICULARLY SUITABLE FOR CLEANING ENVIRONMENTS |
| US3986370A (en) * | 1975-04-07 | 1976-10-19 | Empire Oil Tool Company | Apparatus for connecting motors in tandem |
| US4438361A (en) * | 1982-02-24 | 1984-03-20 | Imc Magnetics Corp. | Stepper motor having rotor with limited axial movement |
| JPS59205067A (en) * | 1983-05-04 | 1984-11-20 | Nissan Motor Co Ltd | Device preventing chattering noise of gear in speed change gear |
-
1985
- 1985-06-18 GB GB08515364A patent/GB2161245B/en not_active Expired
- 1985-06-19 NL NL8501753A patent/NL8501753A/en not_active Application Discontinuation
- 1985-06-25 AU AU44133/85A patent/AU589127B2/en not_active Ceased
- 1985-06-27 MX MX205805A patent/MX163007B/en unknown
- 1985-06-28 CA CA000485935A patent/CA1251660A/en not_active Expired
- 1985-06-28 BR BR8503123A patent/BR8503123A/en not_active IP Right Cessation
- 1985-06-28 DE DE19853523292 patent/DE3523292A1/en not_active Withdrawn
- 1985-07-01 FR FR8510019A patent/FR2568960B1/en not_active Expired
- 1985-07-01 KR KR1019850004697A patent/KR860001302A/en not_active Application Discontinuation
- 1985-07-01 SE SE8503246A patent/SE458556B/en not_active IP Right Cessation
- 1985-07-02 IT IT48309/85A patent/IT1200086B/en active
- 1985-07-02 JP JP14409685A patent/JPS6127338A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BR8503123A (en) | 1986-03-18 |
| JPS6127338A (en) | 1986-02-06 |
| SE8503246L (en) | 1986-01-03 |
| SE458556B (en) | 1989-04-10 |
| MX163007B (en) | 1991-07-31 |
| IT8548309A0 (en) | 1985-07-02 |
| KR860001302A (en) | 1986-02-24 |
| IT1200086B (en) | 1989-01-05 |
| NL8501753A (en) | 1986-02-03 |
| FR2568960B1 (en) | 1988-10-28 |
| GB2161245B (en) | 1988-08-03 |
| AU4413385A (en) | 1986-01-09 |
| FR2568960A1 (en) | 1986-02-14 |
| SE8503246D0 (en) | 1985-07-01 |
| DE3523292A1 (en) | 1986-01-09 |
| GB8515364D0 (en) | 1985-07-17 |
| GB2161245A (en) | 1986-01-08 |
| AU589127B2 (en) | 1989-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |