GB2209142A

GB2209142A - Vibratory roller

Info

Publication number: GB2209142A
Application number: GB8719986A
Authority: GB
Inventors: Ronald Walter Hochstrasser
Original assignee: Stothert and Pitt Ltd
Current assignee: Stothert and Pitt Ltd
Priority date: 1987-08-25
Filing date: 1987-08-25
Publication date: 1989-05-04
Anticipated expiration: 2007-08-25
Also published as: GB8719986D0; GB2209142B

Abstract

A vibratory roller has a cylindrical roll surface 10 with two internal roll end plates 11 and 12. At one side of the roller is a housing 13 which carries the outer ring 14 of a pair of taper roller bearings 15 and 16. The inner races of these roller bearings support a hub 17 of a first drive plate 18. Drive plate 18 is connected by three solid steel bars 19 to a second drive plate 20. Drive plate 18 is connected through rubber and metal resilient support devices 21, 22 to the first roll end plate 11. Similarly the second drive plate is connected through rubber/metal resilient devices or load mountings 23 to the second roll end plate 12. The drive plates 18 and 20 and the solid steel bars 19 together form a strong and rigid cage by which torque for driving the roller is transmitted simultaneously to both sides of the roller. The vibratory motion is applied to the roller by a conventional eccentric vibratory shaft 30 supported in bearings 31 and 32 attached to the roll end plates 11 and 12, the shaft 30 being driven in conventional manner via a pulley 33 and belt drive. <IMAGE>

Description

VIBRATORY ROLLER This invention relates to a vibratory roller.

Vibratory rollers are known, particularly for use in rolling surfaces such as roads and pavements which are being repaired or constructed. One particular form of such vibratory roller is intended to be used as a pedestrian operated roller, but the invention is applicable to vibratory rollers of all kinds whether pedestrian operated or forming part of road rollers or in other forms.

An object of the invention is to provide a construction of roller in which drive torque may be transmitted to both sides of the roller simultaneously and uniformly.

In accordance with the present invention, a vibratory roller comprises a first driven plate located on one side of the roller and connected cantilever fashion by a plurality of axially arranged spaced bars to a second drive plate on the other side of the roller, the two drive plates and the bars together forming a rigid cage, each drive plate being independently connected to the roller through resilient mounting devices, whereby drive torque is transmitted via the two drive plates and rubber mountings to both sides of the roller simultaneously.

With this arrangement, the drive may be applied at one side only through one of the drive plates, but may be uniformly and evenly applied to the roller thus avoiding problems of instability and tearing of rubber mountings etc.

The cantilevered support cage is very rigid, and avoids flexing. The rubber mounting will only be loaded in shear, not in tension and this will prevent the rubber from tearing.

The combined stress in the rubber mountings resulting from static weight and drive torque is equally matched resulting in better isolation of the vibration from the roll.

The invention is preferably applied to a "clear sided roller" i.e. one in which one side of the roller is completely clear of any drive mechanism or other obstruction, the drive being provided at the other side through the first and second drive plates.

Preferably the vibration is applied to the roller through a centrally-located axial vibrating roll and the support bars forming the cage are preferably spaced around but distanced from the vibrating shaft.

The cage is preferably supported at one side in spaced taper roll bearings.

Drive may be in a conventional form e.g. via a chain drive, driving a pinion, which in turn drives through a ring gear attached to the first drive plate.

The accompanying drawing is a diagrammatic section through a vibratory roller incorporating the present invention.

In the drawing the roller has a cylindrical roll surface 10 with two internal roll end plates 11 and 12.

At one side of the roller is a housing 13 which carries the outer ring 14 of a pair of taper roller bearings 15 and 16.

The inner races of these roller bearings support a hub 17 of a first drive plate 18. Drive plate 18 is connected by three solid steel bars 19 (only two of which are shown, but which are uniformly spaced around the axis of the roller) to a second drive plate 20. Drive plate 18 is connected through rubber and metal resilient support devices 21, 22 to the first roll end plate 11. Similarly the second drive plate is connected through rubber/metal resilient devices or load mountings 23 (only one of which is shown in the Figure) to the second roll end plate 12.

The drive plates 18 and 20 and the solid steel bars 19 together form a strong and rigid cage by which torque for driving the roller is transmitted simultaneously to both sides of the roller.

The torque is supplied through a drive sprocket 24 and the shaft 25 carried in bearings mounted in the housing 13. The shaft 25 has at one end a pinion 26 which meshes with a ring gear 29 attached to the first drive plate 18. Thus rotation of sprocket 24 (by means of a chain drive from a motor (not shown)) will cause torque to be applied to the ring gear 29 and the torque will be transmitted through the drive plate 18 and rods 19 to the second drive plate 20. The torque will in turn be transmitted through the resilient rubber mounting to each of the roll end plates 11 and 12 and thus to the roller 10. The vibratory motion is applied to the roller by a conventional eccentric vibratory shaft 30 supported in bearings 31 and 32 attached to the roll end plates 11 and 12, the shaft 30 being driven in conventional manner via a pulley 33 and belt drive (not shown).

It will be noted that the bars 19 are located well clear of the centrally located eccentric shaft 30.

In use the drive torque of the roll is transmitted equally through the two sets of rubber/steel mountings on each side of the roll thus eliminating any imbalance of torque related stress between the two mounting arrangements, achieving better compaction because of the balanced rubber stress and therefore balanced isolation of the vibration between the roll and the frame.

Claims

CLAIMS:

1. A vibratory roller comprising a first driven plate located on one side of the roller and connected cantilever fashion by a plurality of axially arranged spaced bars to a second drive plate on the other side of the roller, the two drive plates and the bars together forming a rigid.cage, each drive plate being independently connected to the roller through resilient mounting devices, whereby drive torque is transmitted via the two drive plates and rubber mountings to both sides of the roller simultaneously.

2. A vibratory roller according to claim 1 in the form of a "clear sided roller" i.e. one in which one side of the roller is completely clear of any drive mechanism or other obstruction, the drive being provided at the other side through the first and second drive plates.

3. A vibratory roller according to claim 1 or claim 2 and in which the vibration is applied to the roller through a centrally-located axial vibrating roll and the support bars forming the cage are spaced around but distanced from the vibrating shaft.

4. A vibratory roller according to any of claims 1 to 3 and in which the cage is supported at one side in spaced taper roll bearings.

5. A vibratory roller according to any of claims 1 to 4 and in which the drive is in a conventional form i.e.

via a chain drive, driving a pinion, which in turn drives through a ring gear attached to the first drive plate.

6. A vibratory roller substantially as hereinbefore particularly described and as illustrated in the accompanying drawings.