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
  • F16C17/00—Sliding-contact bearings for exclusively rotary movement
  • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
• • 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
  • F16C17/00—Sliding-contact bearings for exclusively rotary movement
  • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
  • F16C17/18—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with floating brasses or brushing, rotatable at a reduced speed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
  • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
  • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
  • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
  • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
  • B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
  • B60G15/063—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper characterised by the mounting of the spring on the damper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
  • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
  • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
  • B60G15/067—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper characterised by the mounting on the vehicle body or chassis of the spring and damper unit
  • B60G15/068—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper characterised by the mounting on the vehicle body or chassis of the spring and damper unit specially adapted for MacPherson strut-type suspension
• • 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
  • F16C17/00—Sliding-contact bearings for exclusively rotary movement
  • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
• • 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
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/02—Parts of sliding-contact bearings
  • F16C33/04—Brasses; Bushes; Linings
  • F16C33/20—Sliding surface consisting mainly of plastics
• • 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
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/72—Sealings
  • F16C33/74—Sealings of sliding-contact bearings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2200/00—Indexing codes relating to suspension types
  • B60G2200/10—Independent suspensions
  • B60G2200/14—Independent suspensions with lateral arms
  • B60G2200/142—Independent suspensions with lateral arms with a single lateral arm, e.g. MacPherson type
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
  • B60G2202/30—Spring/Damper and/or actuator Units
  • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
  • B60G2202/312—The spring being a wound spring
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
  • B60G2204/10—Mounting of suspension elements
  • B60G2204/12—Mounting of springs or dampers
  • B60G2204/124—Mounting of coil springs
  • B60G2204/1242—Mounting of coil springs on a damper, e.g. MacPerson strut
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
  • B60G2204/10—Mounting of suspension elements
  • B60G2204/12—Mounting of springs or dampers
  • B60G2204/128—Damper mount on vehicle body or chassis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
  • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
  • B60G2204/418—Bearings, e.g. ball or roller 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2326/00—Articles relating to transporting
  • F16C2326/01—Parts of vehicles in general
  • F16C2326/05—Vehicle suspensions, e.g. bearings, pivots or connecting rods used therein

Definitions

• the invention relates to a ring bearing for use in a MacPherson strut, and more particularly to a ring bearing made of plastic.
• a MacPherson strut assembly has a strut tube 5, and a lower spring seat 4 welded to the strut tube 5.
• a spring 6 is positioned directly on the spring support 4, or may be seated in a rubber dampener which is positioned on the spring seat 4. The latter reduces the road vibration transmitted from the wheels.
• the upper end of the spring 6 is held by the upper spring seat 1 which can also utilize a rubber dampening medium 3.
• a bearing 2 is captured in the upper spring seat 1 and keeps the upper seat 1 concentric to the strut tube 5.
• FIG. 2 An example of a known bearing 2 is described in detail in connection with Fig. 2. It supports the loads which are transferred through the spring 4 in a dual path arrangement and supports the loads from the spring 4 and strut tube 5 in a single path system.
• the bearing 2 (Fig. 2) comprises upper and lower plastic casings 8 and 9.
• the arm extensions 8a, 8b, 8c, 8d, 9a, 9b provide a sealing function and on one side
• the raceways maybe shaped corresponding to the curvature of the balls 10, or may be stamped in approximately a Gothic arch shape, for example. The latter shape provides for axial and radial load-carrying capacity. It also eliminates side movement in the bearing, which eliminates the fouling of the upper and lower plastic casings.
• Another known bearing 2a (Fig. 3) is comprised of an upper hardened steel raceway 12 which is stamped to form an angular contact bearing 2a. A set of balls 10 are held by a lower hardened steel raceway 13 which is covered partially in rubber 14. The rubber 14 provides a sealing function on the inner and outer surfaces. An inner lip 15 of the lower raceway 13 seats into a groove 16 in the upper raceway 12. This locks the bearing 2a together.
• the known designs utilize steel balls in associated steel raceways.
• the raceways and balls are held in place and protected from contamination by upper and lower plastic casings, which lock together by the use of angled lips or extensions which can be on both the outer and inner portions of the upper and lower casings.
• a bearing comprises a plastic chain with elongated sections forming the load-carrying members.
• the links between the sections are reduced in cross-section and allow for limited bending when the load is applied in use.
• the sections are designed to carry a pure axial load which is perpendicular to the bearing top surface.
• the bearing provides a point contact as seen in cross-section.
• the bearing surfaces of the upper and lower casings are preferably mirror images of each other.
• the sections are profiled to permit the carrying of grease to lubricate the sliding surfaces during operation.
• the weight of the bearing is reduced while maintaining the fitting diameters prescribed by the mating components.
• the rolling action of the balls is replaced by a sliding action, which may advantageously be between two dissimilar plastic chemistries.
• the sections are designed to carry the load over a defined angle.
• the bearing operates as an arc-contact bearing. This bearing reduces sideways travel of the casings and possibly squeaking and vibration.
• the sections are designed to carry the load over a defined angle.
• This bearing operates as a combination of a line-contact bearing and an arc-contact bearing.
• a fifth embodiment is designed to carry the load over a defined angle and operates as a four-point contact bearing.
• a sixth embodiment is designed to carry the load over a defined angle and operates as a taper-line-contact bearing.
• the bearing 15 is depicted in Figures 4 and 5. It may have the same strut bearing upper casing 8 (plastic cap) and lower casing 9 (plastic base) as in Figs. 1-2.
• the prior art steel raceways 11a, 1 lb and rolling elements 10 have been replaced by a plastic ring 20.
• the ring 20 is profiled to establish a point contact bearing which is capable of supporting axial load.
• the upper and lower casings 8 and 9 and the plastic ring 20 each have a single radius.
• the radius of the upper and lower casings is R 2 while the radius of the ring 20 is Ri, wherein Ri ⁇ R 2 .
• the ring also may have radial grooves in its top and bottom surfaces as seen for example in Figures 12-14, which would eliminate contact at the central point where the ring 20 meets the upper and lower casings. This would reduce the friction of the assembly.
• the ring also may have recesses in its top and bottom sides again as seen for example in Figures 12-14, which are used to carry lubrication.
• the lubrication reduces friction and aids in the sealing of the bearing for improved lifetime.
• the design is economical due to the elimination of steel raceways and balls.
• the design is economical due to the elimination of steel raceways and balls.
• the radius of the plastic ring and the upper/lower casing i.e. Riand R 2
• the weight of the bearing is reduced while maintaining the fitting diameters prescribed by the mating components.
• the rolling action of the balls is replaced by a sliding action which may be between two dissimilar plastic chemistries.
• the retained lubricant supplies sealing and continued lubrication through the life of the bearing.
• FIG. 6 The second embodiment of a bearing 25 is depicted in Figures 6 and 7, Figure 6 being a partly broken-away perspective view and Figure 7 being a partial cross-section. It has the same strut bearing upper casing (plastic cap) 8 and lower casing (plastic base) 9 as in Figures 4-5.
• the prior art steel raceways and rolling elements have been replaced by a plastic ring 30.
• Said ring 30 is profiled to establish an arc-contact bearing which is capable of supporting radial and axial loads.
• a contact interface of single radius R is formed between the upper and lower casings and the plastic ring 30.
• the ring may have central radial grooves at its top and bottom surfaces as seen for example in Figures 12-14 to eliminate contact where the ring meets the arches of the upper and lower casings. This feature would keep the friction of the assembly low.
• the ring 30 also has recesses 32, 34 on its top and bottom sides which are used to carry lubrication. Said lubrication reduces friction and aids in the sealing of the bearing for improved lifetime.
• Said ring is profiled to establish a four-arc contact bearing which is capable of supporting radial and axial loads.
• Contact between the ring 40 and the upper and lower casings 8 and 9 is provided by both the ring and the casings having a single radius Ri, over an angular range defined by ⁇ contact angle ⁇ ⁇ .
• the ring 40 also has flattened top and bottom surfaces, leaving spaces between the top and bottom of the ring and the upper and lower casings.
• the ring also may have radial grooves in its top and bottom surfaces as seen for example in Figures 12-14. These arrangements eliminate central contact where the ring meets the upper and lower casings, keeping the friction of the assembly low.
• the ring also has recesses on its top and bottom sides, again as seen for example in Figures 12-14, which are used to carry lubrication. Said lubrication reduces friction and aids in the sealing of the bearing for improved lifetime.
• the design is economical achieved due to the elimination of steel raceways and balls.
• the parameters i.e. Ri, R 2 , R 3 , and ⁇
• the weight of the bearing is reduced while maintaining the fitting diameters prescribed by the mating components.
• the rolling action of the balls is replaced by a sliding action, which may be between two dissimilar plastic chemistries.
• the retained lubricant supplies sealing and continued lubrication through the life of the bearing.
• the fourth bearing 45 is depicted in Figures 10 and 11. It has a strut bearing upper casing (plastic cap) 8a and lower casing (plastic base) 9a similar to those in Figures 4-5, with modifications as follows.
• the prior art steel raceways and rolling elements have been replaced by a plastic ring 50.
• Said ring 50 is profiled to establish a line/arc contact bearing which is capable of supporting radial and axial loads.
• the contact is provided by the casings 8a and 9a and the ring 50 having a single radius R, over an angular range defined by ⁇ ⁇ contact angle ⁇ ⁇ .
• the ring also has radial grooves 52, 54 at its top and bottom surfaces to eliminate the possibility of contact in the center regions of the upper and lower casings 8a, 9a. This will keep the friction of the assembly low.
• the upper and lower casings 8a, 9a have respective projections 56, 58 which project into the grooves 52, 54, respectively.
• the ring also has recesses on its top and bottom sides as shown for example in Figures 12-14 which are used to carry lubrication. Said lubrication reduces friction and aids in the sealing of the bearing for improved lifetime.
• the design is economical due to the elimination of steel raceways and balls.
• the parameters i.e. R, and ⁇
• the weight of the bearing is reduced while maintaining the fitting diameters prescribed by the mating components.
• the rolling action of the balls is replaced by a sliding action, which may be between two dissimilar plastic chemistries.
• the retained lubricant supplies sealing and continued lubrication through the life of the bearing.
• a fifth bearing 55 is shown in Figures 12-14. As shown in Figure 12, the bearing itself is shown fitted into a representative upper spring seat la corresponding to the upper spring seat 1 shown in Figure 1. It is retained in the seat la by the use of plastic ears 56 on the lower bearing casing 9b which are snapped under rubber tabs 57 on the vulcanized steel spring seat la.
• Figure 13 the bearing 55 is depicted in cross-section.
• Figure 14 is a partly broken-away perspective view. It has a strut bearing upper casing or plastic cap 8 similar to that in Figures 4-5.
• the lower section or plastic base 9b is similar to that in Figures 4-5, with modifications as described above.
• the prior art steel raceways and rolling elements have been replaced by a plastic ring 60.
• Said ring 60 is profiled to establish a four-point contact bearing at its top and bottom, inner and outer corners which is capable of supporting radial and axial loads.
• the ring also has central grooves 62, 64 formed in its top and bottom surfaces to eliminate contact where the ring 60 meets the upper and lower casings 8, 9b. This reduces the friction of the assembly.
• the ring also has recesses 66, 68 on its top and bottom sides which are used to carry lubrication. Said lubrication reduces friction and aids in the sealing of the bearing for improved lifetime.
• a sixth bearing is depicted in Figures 15 and 16. It has a strut bearing upper casing (plastic cap) 8c and lower casing (plastic base) 9c.
• the prior art steel raceways and rolling elements have been replaced by a plastic ring 70.
• Said ring 70 is generally N-shaped in cross-section and is profiled to establish a multiple-point contact bearing which is capable of supporting axial load.
• the upper, lower casings 8c, 9c and plastic ring 70 have substantially flat interfaces 71, 72, 73, 74 at their upper and lower, inner and outer regions.
• a flat central face 75 is formed on the top surface of the ring 70, forming an angle with the interface 71 and an angle 180° - with the interface 73.
• a flat central face 76 is fomred on the upper surface of the lower casing 9c, forming an angle ⁇ with the interface 74 and an angle 180° - ⁇ with the interface 72.
• the flat surfaces 75, 76 form gaps between the ring 70 and the top and bottom casings 8c, 9c to eliminate contact at the central portions where the ring and the upper and lower casings meet. This will keep the friction of the assembly low.
• Additional recessess 77 are formed in other respective surfaces of the ring 70 which carry lubrication and further reduce friction.
• the ring also has recesses on its top and bottom sides as seen for example in Figure 12-14 which are used to carry lubrication. Said lubrication reduces friction and aids in the sealing of the bearing for improved lifetime.
• the design is economical due to the elimination of steel raceways and balls.
• the design parameters, i.e. a and ⁇ , can be modified to improve axial and radial load capacity, may be greater than ⁇ as shown in Figure 16, or a and ⁇ may have another relationship.
• the weight of the bearing is reduced while maintaining the fitting lines prescribed by the mating components.
• the rolling action of the balls is replaced by a sliding action, which may be between two dissimilar plastic chemistries.
• the retained lubricant supplies sealing and continued lubrication through the life of the bearing.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rolling Contact Bearings (AREA)
• Vehicle Body Suspensions (AREA)
• Prostheses (AREA)
• Fluid-Damping Devices (AREA)
• Sliding-Contact Bearings (AREA)
• Springs (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (2)

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ID=32682309

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (16)

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• 2003
  • 2003-12-18 EP EP03814313A patent/EP1585904B1/en not_active Expired - Lifetime
  • 2003-12-18 WO PCT/US2003/040940 patent/WO2004059181A2/en not_active Ceased
  • 2003-12-18 US US10/539,782 patent/US7422200B2/en not_active Expired - Fee Related
  • 2003-12-18 KR KR1020057011578A patent/KR101045042B1/ko not_active Expired - Fee Related
  • 2003-12-18 JP JP2004563951A patent/JP2006513374A/ja active Pending
  • 2003-12-18 DE DE60334743T patent/DE60334743D1/de not_active Expired - Lifetime
  • 2003-12-18 AU AU2003297470A patent/AU2003297470A1/en not_active Abandoned
  • 2003-12-18 AT AT03814313T patent/ATE486225T1/de not_active IP Right Cessation
  • 2003-12-19 US US10/742,002 patent/US7000909B2/en not_active Expired - Lifetime

Non-Patent Citations (2)

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