- Email: [email protected]
Constant velocity joint seal
Patents drivehead. The seal a r r a n g e m e n t further i n c l u d e s a centering p a c k i n g for connecting the centralizer sleeve with the polished rod for s i m u l t a n e o u s rotation a b o u t the longitudinal axis. The centering p a c k i n g is sufficiently elastic to a c c o m m o d a t e wobble of the polished rod in the centralizer sleeve while p r e v e n t i n g l e a k a g e of a p u m p e d liquid p r e s e n t in the p r o d u c t i o n t u b i n g a n d the centralizer sleeve d u r i n g operation of the p u m p . The seal a r r a n g e m e n t also includes an a n n u l a r drivehead seal for sealing the a n n u l a r gap to prevent leakage of the p u m p e d liquid from the drivehead. With this a r r a n g e m e n t , polished rod wobble c o m p e n s a t i o n a n d sliding sealing of the d r i v e h e a d a r e carried out a t s e p a r a t e locations in the drivehead which r e s u l t s in a more reliable seal a n d r e d u c e d s t r e s s on the seal m a t e r i a l s . This provides the seal with an extended service period.
Constant v e l o c i t y joint seal Patent number: U S 5 6 3 9 0 9 9 Publication date: 17th J u n e 1997 Inventors: D Booker, R Frazer Assignee: GKN A u t o m o t i v e Conventional seals designed for u s e with a u n i v e r s a l j o i n t a n d a transmission output component often fail to a d d r e s s the i s s u e s of u n w a n t e d axial slip between a universal joint and a transmission o u t p u t c o m p o n e n t . In certain c i r c u m s t a n c e s , a small a m o u n t of axial play or slip exists in the connection of a c o n s t a n t velocity j o i n t a n d a t r a n s f e r case o u t p u t m e m b e r in some four wheel drive applications. It is d e s i r a b l e to provide a p r e d e t e r m i n e d axial load or force between the c o n s t a n t velocity j o i n t a n d the t r a n s f e r case o u t p u t c o m p o n e n t which forces the two c o m p o n e n t s a p a r t , eliminating axial motion. This axial load or force also provides a p r e l o a d on the circuit c o n n e c t i o n on the s t e m of the c o n s t a n t velocity j o i n t for b e t t e r r e t e n t i o n of the c o n s t a n t
14
14
IG
404 ~ 2 ~ , 22
28 2G
12 36 52
2O 18 15
a n d a flange seal portion which e x t e n d s from the o u t e r wall. The flange h a s a n i n n e r c o n t a c t i n g surface to c o n t a c t the c o n s t a n t velocity joint a n d define a protective seal between the c o n s t a n t velocity j o i n t a n d the transmission output component.
Gas seal Oring holder
Figure 2. The seal provides an axial force to reduce the slip b e t w e e n the universal j o i n t and t r a n s m i s s i o n output.
P a t e n t number: U S 5 6 3 9 0 9 7 Publication date: 1 7 t h J u n e 1997 Inventors: J Gardner, M Cunningham Assignee: EG&G Sealol
velocity joint within the transfer case o u t p u t component. The p r o p o s e d seal (Figure 2) comprises a m a i n seal body with a central axis of rotation. The inner wall defines a connecting region with a generally cylindrical portion for connecting the seal to the t r a n s m i s s i o n o u t p u t component. A r a i s e d rib extends out from the first side of the seal. This rib is axially deformable in s u c h a way as to create an axial force along the axis of rotation for r e d u c i n g the axial slip between the c o n s t a n t velocity j o i n t a n d the transmission output component
In a conventional gas seal, an O-ring is p l a c e d b e t w e e n the s t a t i o n a r y seal ring a n d the s t a t i o n a r y seal ring c a r r i e r to provide a s e c o n d a r y d y n a m i c seal. The seal ring is typically m a n u f a c t u r e d from m a t e r i a l s having low t h e r m a l e x p a n s i o n coefficients, s u c h as c a r b o n graphite, silicon carbide, or t u n g s t e n carbide. The ring carrier in s u c h a conventional gas seal is fabricated from metal, s u c h as s t a i n l e s s steel, Inconel 625, or a n o t h e r m e t a l having good corrosion a n d t e m p e r a t u r e resistance, a n d the r e q u i r e d s t r e n g t h . The m e t a l s from which
°
V////A H3
Figure 3. The gas face seal incorporating a c o m p l i a n t O-ring holder.
Sealing Technology No. 45
Constant v e l o c i t y joint seal Patent number: U S 5 6 3 9 0 9 9 Publication date: 17th J u n e 1997 Inventors: D Booker, R Frazer Assignee: GKN A u t o m o t i v e Conventional seals designed for u s e with a u n i v e r s a l j o i n t a n d a transmission output component often fail to a d d r e s s the i s s u e s of u n w a n t e d axial slip between a universal joint and a transmission o u t p u t c o m p o n e n t . In certain c i r c u m s t a n c e s , a small a m o u n t of axial play or slip exists in the connection of a c o n s t a n t velocity j o i n t a n d a t r a n s f e r case o u t p u t m e m b e r in some four wheel drive applications. It is d e s i r a b l e to provide a p r e d e t e r m i n e d axial load or force between the c o n s t a n t velocity j o i n t a n d the t r a n s f e r case o u t p u t c o m p o n e n t which forces the two c o m p o n e n t s a p a r t , eliminating axial motion. This axial load or force also provides a p r e l o a d on the circuit c o n n e c t i o n on the s t e m of the c o n s t a n t velocity j o i n t for b e t t e r r e t e n t i o n of the c o n s t a n t
14
14
IG
404 ~ 2 ~ , 22
28 2G
12 36 52
2O 18 15
a n d a flange seal portion which e x t e n d s from the o u t e r wall. The flange h a s a n i n n e r c o n t a c t i n g surface to c o n t a c t the c o n s t a n t velocity joint a n d define a protective seal between the c o n s t a n t velocity j o i n t a n d the transmission output component.
Gas seal Oring holder
Figure 2. The seal provides an axial force to reduce the slip b e t w e e n the universal j o i n t and t r a n s m i s s i o n output.
P a t e n t number: U S 5 6 3 9 0 9 7 Publication date: 1 7 t h J u n e 1997 Inventors: J Gardner, M Cunningham Assignee: EG&G Sealol
velocity joint within the transfer case o u t p u t component. The p r o p o s e d seal (Figure 2) comprises a m a i n seal body with a central axis of rotation. The inner wall defines a connecting region with a generally cylindrical portion for connecting the seal to the t r a n s m i s s i o n o u t p u t component. A r a i s e d rib extends out from the first side of the seal. This rib is axially deformable in s u c h a way as to create an axial force along the axis of rotation for r e d u c i n g the axial slip between the c o n s t a n t velocity j o i n t a n d the transmission output component
In a conventional gas seal, an O-ring is p l a c e d b e t w e e n the s t a t i o n a r y seal ring a n d the s t a t i o n a r y seal ring c a r r i e r to provide a s e c o n d a r y d y n a m i c seal. The seal ring is typically m a n u f a c t u r e d from m a t e r i a l s having low t h e r m a l e x p a n s i o n coefficients, s u c h as c a r b o n graphite, silicon carbide, or t u n g s t e n carbide. The ring carrier in s u c h a conventional gas seal is fabricated from metal, s u c h as s t a i n l e s s steel, Inconel 625, or a n o t h e r m e t a l having good corrosion a n d t e m p e r a t u r e resistance, a n d the r e q u i r e d s t r e n g t h . The m e t a l s from which
°
V////A H3
Figure 3. The gas face seal incorporating a c o m p l i a n t O-ring holder.
Sealing Technology No. 45