WO1982001904A1 - Dispositif a auto-alignement pour l'arbre a montage excentrique d'un compacteur vibrant - Google Patents

Dispositif a auto-alignement pour l'arbre a montage excentrique d'un compacteur vibrant Download PDF

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Publication number
WO1982001904A1
WO1982001904A1 PCT/US1980/001632 US8001632W WO8201904A1 WO 1982001904 A1 WO1982001904 A1 WO 1982001904A1 US 8001632 W US8001632 W US 8001632W WO 8201904 A1 WO8201904 A1 WO 8201904A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
bearing assemblies
drum
sleeve
vibratory compactor
Prior art date
Application number
PCT/US1980/001632
Other languages
English (en)
Inventor
John J Bloom
Original Assignee
John J Bloom
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by John J Bloom filed Critical John J Bloom
Priority to PCT/US1980/001632 priority Critical patent/WO1982001904A1/fr
Publication of WO1982001904A1 publication Critical patent/WO1982001904A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
    • E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll

Definitions

  • This invention relates generally to an arrangement for supporting an eccentric mounting shaft within a compactor drum by a pair of axially spaced bearing assemblies and more particularly to means for locating the bearing assemblies on the shaft to place the rotational axes of the drum and shaft in co ⁇ incident relationship relative to each other.
  • Vibratory compactors are commonly employed for compacting freshly laid asphalt paving, soils, and similar materials.
  • the compactor comprises a drum resiliently and rotatably mounted in a frame assembly wherein an eccentric mounting shaft is located and rotates relative to the drum and which vibrates the drum to provide the desired compaction of the material being worked.
  • the shaft is rotatably mounted in the drum by a pair of longitudinally spaced bearing assemblies which must exhibit high load-carrying capacities during operation of the compactor.
  • the bearing assemblies normally comprise spherical or tapered roller bearings which require precise preloading to insure maximum system rigidity. Continued use of the compactor oftentimes requires readjustment of the preloading to continuously insure such system rigidity. In addition, the outer races or rings of the bearing assemblies must be precisely
  • OMPI aligned longitudinally by a line-boring operation to insure that the rotational axes of the shaft and drum are co-incident to avoid the imposition of adverse loads on the bearing assemblies.
  • line-boring is expensive and does not always insure such precise alignment.
  • the present invention is directed to overcoming one or more of the problems as set forth above.
  • a vibratory compactor comprises a drum rotatable about its longitudinal axis, an eccentric mounting shaft rotatable about its longitudinal axis, and a pair of bearing assemblies mounting the shaft for rotation in the drum.
  • the improvement in the compactor comprises self-aligning means for mounting each of the bearing assemblies on the shaft for permitting limited relative movement between the shaft and the bearing assemblies to place the longitudinal axes of the drum and the shaft in co-incident relationship relative to each other.
  • this invention provides that the bearing assemblies may exhibit a high load-carrying to size ratio in contrast to conventional bearing assemblies of this type.
  • the self-aligning feature of this invention also eliminates the need for periodic readjustment of the preloading of the bearing assemblies and maintains them in a stress-relieved condition of operation.
  • Figure 1 is a longitudinal and partially sectioned view through a vibratory compactor employing a self-aligning mounting arrangement embodying the present invention
  • Figure 2 is an enlarged sectional view more clearly illustrating the mounting arrangement for mounting an eccentric shaft in a drum of the vibratory compactor
  • Figure 3 is a sectional view illustrating a modified self-aligning mounting arrangement; and Figure 4 is a view taken in the direction of arrows IV-IV in Figure 3.
  • Figs. 1 and 2 illustrate a portion of a vibratory compactor 10 comprising a drum 11 rotatable about a longitudinal axis A thereof.
  • One end of the drum is rotatably mounted on a mounting bracket assembly 12, secured to a frame structure 13 of a vehicle, by a pair of tapered roller bearing assemblies 14.
  • the opposite end of the drum is connected to an electric or hydraulic drive motor 15 having a drive flange 16 suitably secured to the drum through an annular plate 17 and a plurality of circumferentially spaced elastomeric cushioning pads 18.
  • Similar pads 19 may also connect bracket assembly 12 to frame structure 13 to substantially isolate the vibratory motion of the drum from motor 15 and frame structure 13.
  • FIG. 1 illustrates the selective driving of drum 11 by motor 15, it should be understood that the drum could be non-driven. In the latter construction, the motor and attendant structures would be eliminated and replaced by supporting structures similar to mounting bracket assembly 12 and bearing assemblies 14 for rotational support of the drum on the frame structure of the vehicle. In either case, an eccentric mounting shaft 20 is rotatably mounted in drum 11 and has an eccentric weight 21 secured thereon to operate in a conventional manner. In particular, as shown in Fig. 2, shaft 20 is selectively driven by an electric or hydraulic motor 22 to generate vibrations which are transmitted to the outer surfaces of the drum for compaction purposes.
  • inner races 24 of bearing assemblies 23 would be press-fitted or otherwise suitably secured directly onto shaft 20 whereby the bearing assemblies would be directly subjected to loading in response to the vibratory motion of shaft 20.
  • bores 25, defined in carriers 26 for outer races 27 of the bearing assemblies would require precise machining to make them concentric in respect to the rotational axes of drum 11 and shaft 20.
  • this invention provides a self-aligning means 28 for each bearing assembly 23 for permitting limited relative movement between shaft 20 and the bearing assemblies to place longitudinal axis A of drum 11 and the longitudinal or rotational axis A' of shaft 20 in co-incident relationship relative to each other.
  • the bearing assemblies will not require preloading.
  • self-aligning means 28 will aid in preventing bearing assemblies 23 from being subjected to undue loading which could adversely affect the service lives thereof.
  • self-aligning means 28 comprises a tubular sleeve 29 having an outer cylindrical surface 30 press-fitted or otherwise suitably inserted within internal bores 31 defined in inner races 24 of bearing assembly 23.
  • An annular flange 32, integrally formed on carrier 26, a ring 33 attached to the opposite side of the carrier, and a snap ring 34 attached on the periphery of sleeve 29 may be utilized to retain bearing assembly 23 in its pre-set axial position.
  • the desired pre-load is "built-into" bearing assembly 23 prior to its installation in compactor 10.
  • Self-aligning means 28 further includes a spline connection 35 for connecting shaft 20 in sleeve 29. As shown in Fig.
  • spline connection 35 comprises a plurality of radially disposed and longitudinally extending teeth 36 formed internally of sleeve 29 and a plurality of accommodating slots 37 formed on the periphery of shaft 20.
  • Radial clearances C-. may be defined between the ends of teeth 36 and the bottoms of slots 37 to provide the desired limited relative movement between shaft 20 and sleeve 29.
  • a clearance C 2 may be defined axially between adjacent ends of teeth 36 and grooves 37 to permit limited longitudinal movement therebetween. The size of such clearances will, of course, depend on the particular design under consideration and should be sufficient to permit a longitudinal axis A* of shaft 20 to be placed in co-incident relationship relative to longitudinal axis A of drum 11.
  • an output shaft 38 of motor 22 may be connected to shaft 20 by a flexible coupling 39, an intermediate splined shaft 40, and a connecting plate 41 secured between shafts 20 and 40.
  • bearing assembly 23 may be of the ball bearing or cylindrical roller-type, the bearing assembly preferably comprises a set of the illustrated tapered-roller bearings. Bearings of this type are particularly useful to counteract the heavy radial and thrust loads imposed thereon during operation of vibratory compactory 10. As is well-known to those skilled in the art, a bearing of this type is designed so that all elements on the rolling surface and the raceways intersect at a common point on its axis to thus provide true rolling. As mentioned above, maximum system rigidity can be insured by preadjusting the bearings assemblies under predetermined preloads.
  • Fig. 3 illustrates a modified self—aligning means 28* and attendant structures wherein identical numerals depict corresponding constructions, but wherein numerals depiciting modified constructions are accompanied by a prime symbol (' ) .
  • illustrated self-aligning means 28* would be substituted in lieu of the self-aligning means 28 in Fig. 1, on both ends of shaft 20.
  • Self-aligning means 28' comprises a sleeve 29' press-fitted or otherwise suitably mounted within inner races 24 of bearing assembly 23 and a longitudinally extending groove 42 formed internally on the sleeve.
  • An eccentric mounting shaft 20' is mounted in sleeve 29' by a ball and socket connection 35'.
  • connection includes a semi-spherical shaft portion 36' mounted in a semi-spherical seat 37', formed in an annular member 43 disposed in the sleeve.
  • Shaft 20' is keyed to sleeve 29* by a plate
  • a tongue 46 is formed on plate 44 to engage groove 42 whereby shaft 20', sleeve 29', and bearing races 24 will rotate together.
  • a snap ring 47 is attached in sleeve 29* and is disposed longitudinally between member 43 and plate 44 to limit relative axial movements between the sleeve and shaft.
  • a slight radial clearance C is defined radially between tongue 46 and surface portions defining groove 42, as well as between plate 44 and sleeve 29* proper, to cooperate with ball and socket connection 35' for permitting limited relative movement between shaf 20 * and outer races 27 of bearing assembly 23 to place the longitudinal axes of drum 11 and the shaft in co- incident relationship relative to each other for purposes explained above.
  • shaft 20 * may be attached to drive motor 22 in substantially the same manner as described above.
  • a similar ball and socket connection 35* would be employed to attach the shaft to the other bearing assembly.
  • Motor drive shaft 40 could be attached to the opposite end of the shaft 20' by a similar plate 41.
  • Compactor 10 of Fig. 1 is particularly useful for the compaction of freshly laid asphalt paving, soil, and similar materials.
  • drum 11 is shown to be selectively driven by a motor 15, it should be understood that the drum could be non-driven in the manner described above.
  • motor 22 will be selectively driven to rotate eccentric mounting shaft 20 to impart vibratory energy to drum

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)

Abstract

Le tambour d'un compacteur vibrant est monte normalement en rotation de maniere elastique sur un chassis et possede un arbre excentrique monte a l'aide d'une paire d'assemblages de paliers longitudinaux. Les cages exterieures des assemblages de paliers doivent etre montees de maniere precise dans des alesages definis dans des organes porteurs fixes sur le tambour et les alesages doivent etre en alignement precis pour assurer la relation coincidente des axes de rotation du tambour et de l'arbre. Outre le probleme du mauvais alignement et les couts de fabrication, les assemblages de paliers doivent etre precharges l'un vers l'autre et le rapport entre la char8e et la dimension des assemblages de paliers est normalement relativement faible. Les problemes de l'art anterieur susmentionnes sont elimines par un dispositif a auto-alignement (28) de cette invention qui fonctionnent pour monter une paire d'assemblages de paliers espaces longitudinalement (23) sur un arbre a montage excentrique (20) pour permettre un mouvement relatif limite entre l'arbre (20) et un tambour (11) pour placer les axes longitudinaux (A, A') du tambour (11) et de l'arbre (20) en relation coincidente l'un par rapport a l'autre.
PCT/US1980/001632 1980-12-05 1980-12-05 Dispositif a auto-alignement pour l'arbre a montage excentrique d'un compacteur vibrant WO1982001904A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1980/001632 WO1982001904A1 (fr) 1980-12-05 1980-12-05 Dispositif a auto-alignement pour l'arbre a montage excentrique d'un compacteur vibrant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOUS80/01632801205 1980-12-05
PCT/US1980/001632 WO1982001904A1 (fr) 1980-12-05 1980-12-05 Dispositif a auto-alignement pour l'arbre a montage excentrique d'un compacteur vibrant

Publications (1)

Publication Number Publication Date
WO1982001904A1 true WO1982001904A1 (fr) 1982-06-10

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778822A (en) * 1927-04-29 1930-10-21 Timken Roller Bearing Co Shaft bearing
US2612788A (en) * 1951-01-22 1952-10-07 American Pulley Co Combined shaft journal and drive unit
US3187591A (en) * 1961-06-12 1965-06-08 Louis W Johnson Vibrating apparatus
US3411420A (en) * 1967-06-08 1968-11-19 Tampo Mfg Company Vibratory earth roller
US3427940A (en) * 1966-09-15 1969-02-18 Westinghouse Air Brake Co Tow-type two-wheeled vibratory trench roller apparatus
US3437019A (en) * 1967-05-31 1969-04-08 Hyster Co Vibratory compactor
US3590702A (en) * 1969-04-23 1971-07-06 Peppino Sechi Vibratory roller
US3635134A (en) * 1969-12-03 1972-01-18 Hubert E Thomas Vibratory rollers
US3957319A (en) * 1975-01-29 1976-05-18 Reliance Electric Company Pillow block and bearing assembly
US3981550A (en) * 1975-01-20 1976-09-21 Borg-Warner Corporation Bearing improvement
US4195947A (en) * 1977-03-09 1980-04-01 Lambertz Hans Reinhard Bearing arrangement for roller bodies in compacting rollers

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778822A (en) * 1927-04-29 1930-10-21 Timken Roller Bearing Co Shaft bearing
US2612788A (en) * 1951-01-22 1952-10-07 American Pulley Co Combined shaft journal and drive unit
US3187591A (en) * 1961-06-12 1965-06-08 Louis W Johnson Vibrating apparatus
US3427940A (en) * 1966-09-15 1969-02-18 Westinghouse Air Brake Co Tow-type two-wheeled vibratory trench roller apparatus
US3437019A (en) * 1967-05-31 1969-04-08 Hyster Co Vibratory compactor
US3411420A (en) * 1967-06-08 1968-11-19 Tampo Mfg Company Vibratory earth roller
US3590702A (en) * 1969-04-23 1971-07-06 Peppino Sechi Vibratory roller
US3635134A (en) * 1969-12-03 1972-01-18 Hubert E Thomas Vibratory rollers
US3981550A (en) * 1975-01-20 1976-09-21 Borg-Warner Corporation Bearing improvement
US3957319A (en) * 1975-01-29 1976-05-18 Reliance Electric Company Pillow block and bearing assembly
US4195947A (en) * 1977-03-09 1980-04-01 Lambertz Hans Reinhard Bearing arrangement for roller bodies in compacting rollers

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