IL25239A

IL25239A - Tandem road roller

Info

Publication number: IL25239A
Application number: IL2523966A
Authority: IL
Original assignee: Kaltenegger B
Priority date: 1965-03-20
Filing date: 1966-02-23
Publication date: 1969-12-31
Also published as: ES324397A1; CH464269A; GB1135289A; SE312820B; BE678069A; NL6603553A; NL146559B

Description

'πιιυι in fjinrn m PATENT ATTORNEYS ■ D'DIQS 13Ί 1 U .D.H FII. C/ 24092 PATENTS AND DESIGNS ORDINANCE SPECIFICATION Tandem road roller DUD ! (we) BEHNO KA1TEEEGGER, a German citizen, of Wahnbachtalstrasse 8, Siegburg, Germany- do hereby declare the nature of this invention and in what manner the same is to "be performed, to "be particularly described and ascertained in and by the following statement: - Tandem road roller The invention relates to a tandem road roller having rolls arranged one behind the other in the direction of travel.

Tandem road rollers are known in the most varied designs. In the case of one type of road roller, the latter has a front roll and two rear rolls arranged in spaced relationship, the front roll being pivotally and steerably mounted. With a road roller of this kind, rolling-down of the subsoil can be effected also at the marginal zones, due to the fact that the rear rolls are free from frame elements and the like at the outer end-face sides. However, a roller of this kind is cumbersome, apart from the fact that it has three rolls. In other road rollers having two rolls disposed one behind the other, at least one roll is surrounded onboth sides by the retaining frame. Also with this arrangement, the1 lateral projection of the frame is troublesome during the rolling-down of the marginal zones of the subsoil. It has furthermore been proposed to mount the rear roll unilaterally in a U-shaped frame, with which arrangement the front roll is designed as a pivoting steering roll. */ith this desiga, both the rolls arranged one behind the other are free from frame elements at the same end-face side, so that the marginal zone of the subsoil can be satis actorily dealt with at one side. For working on the marginal zone of the subsoil on the other siie, however, it is and this is time-consuming, and inconvenient. Furthermore, the above-described road roller is excessively expensive and heavy in build. In all known road rollers, the roller width is determined and unchanged by the construction of the road roller per se .

It is the object of the invention to provide a tandem road roller which has no troublesome frame elements at the sides of the rolls, so that the marginal zones of the subsoil can be dealt with unhindered and wherein it is possible to vary the rolling width. In a tandem road roller having rolls arranged on a frame, one behind the other in the direction of trave] the invention is characterised in that each roll is mounted overhung on the frame and in that the roll 8 arranged one behind the other are offset laterally with respect to each other and each roll projects, with its free end, laterally MF¾X the frame. In this manner, a road roller is obtained \ wherein both sidds of the road roller are free from frame elements, without it being necessary to include a third roll. The roller itself is simple in design and simple to operate. It is possible with the roller to roll-down both marginal zones ofthe subsoil close up to the kerb or the like, this being done with only two rolls arranged one behind the other and without any necessity for inconvenient turning. With this arrangement, the rolls disposed one behind the other can be directly driven. The result is a compact and s»dily handled road roller.

The rolls may be rigidly mounted on the frame. roller furthermore makes it possible to mount the rolls in such tna.uier on the frame that they are pivotal and adjustable, independently of each other in the one or the other direction, through a predetermined angle. By this means, the advantage is achieved that varying rolling widths can be adjusted with the same road roller. In the normal position of the rolls, i.e. at right; angles to the frame elements retaining the rolls, a rolling width is obtained which is somewhat greater than the roll length. If the two rolls are pivoted relatively to each other, the rolling width can be reduced to the length of the rolls. If the rolls are, in each case, pivoted outwardly, a rolling wi Ith of up to twice the smallest rolling width can be attained. The rolls are pivoted, in each specific case, through the same angular quantity, so that the rolls always pass into a position in which they are parallel to each other.

Any rolling width between the said extremes can be adjusted with the roller according to the invention. It is furthermore possible to pivot only one roll.

By this means curves can be negotiated. It is possible to adjust any desired turning curve. With advantageous y justment of the pivotal rolls, a relatively small turning circle can be achieved.

The frame is expediently designed in such manner that it has a central beam extending transversely of the direction of travel and arms extending from the ends of the central beam in the opposite direction. The rolls are counted overhung on the frame anas. Both together or independently of each other, for example by means of one motor in each case having gear ng.

Furthermore, each roll can also be provided with a driven unbalanced shaft. Both the transmission shaft for the drive of the unbalances and also the shaft for driving the rolls are advantageously accommodated in the central beam'of the frame. The two driving shafts are expediently arranged one below the other. In a further advantageous embodiment, the drives for the travel of the tandem road roller and for the vibration of the rolls are arranged independently of each other at the side of the frame remote from each roll. For this purpose, the central beam of the frame expediently extends, as a compact element, in the direction of travel of t;ie rolls.

The complete independence of the drives for the travel of the road roller and for the actuation of the unbalanced shafts has a plurality of advantages in the tandem road roller of the type mentioned.

The accommodation of the independent driving devices is improved. Instead of arranging a single, large and heavy driving device above the rolls, the driving devices, which are separate and operate independently of each other, can be accommodated in the free space formed due to the displacement of the rollis, in the form of flanged-on units, so that it is not necessary to provide, externally and about the arrangement, supplementary, troublesome retaining device and carriers or supports. Furthermore, it is possible to use appropriate motors for each mode of driving. The transmission systems are substantially smaller. The both modes of driving. I'he vibration shafts can be driven at high speeds, whereas, a:-.; a whole, substan ially low:r speeds a e conventionally used for the movement of the road roller. The possibili ies for regulation or adjustment are simple^ and infinitely variable adjustment of the transmission system is facilitated.

The invention is discussed hereinbelow with rei'erence to examples of embodiment shown in the drawings, wherein: Figure 1 shows a tandem road roller according to the invention, as a plan view and in diagrammatic orm; Figure shows a further embodiment of the tandem road roller according to the invention of Figure 1, having pivotally arranged rolls, shown as a plan view and In diagrammatic form; Figure 3 shows the road roller of Figur 1, as a lateral elevation; Figures 4- and 5 show cross-sections in respect of the road roller of Figure 3> taken along the line IV-IV and V-V of Figure 3; Figure 6 shows a view corresponding to that of Figure 4-, with independent drive of the rolls; Figures 7 and 8 show a road roller according to Figure 2, as a lateral view and a plan view, in diagrammatic form; Figure is a vertical section through a roll, taken along the line VIII of Figure 6; Figure 10 i_ a cross-section along the line IX-IX relatively to Figure 8; diagrammatic form; Figures 12 to show a further embodiment of the tandem road roller according to the invention, having separate drives, the illustration oeing in plan view and also in cross-sections taken along the lines II-II and III-III of Figure 1.

The tandem road roller according to the invention has two rolls 1 and 2 which are disposed one behind the ouher in the direction of travel and both of which are mounted overhung on the frame 3· The rolls 1 and 2 are so offset relatively to each other that the outer end-face side of the rolls and therewith the road roiler as a whole is free from any troublesome frame element. The frame 3 consists of a central beam (or spar) extending transversely of the travel direction and arms (or limbs) 5 and 6 extending from the ends of the central beam 4, in the opposite direction. The rolls 1 and 2 are pivotally mounted on the frame projections 7 and 3, which are rigidly connected with the frame arms 5 and 6.

In the case of the example of embodiment shown in Figure 2, the rolls 1a and 2a are mounted for adjustment and pivoting about the vertical pivots 9 and 10, on the frame 3a. Due to the pivotability of the rolls, the rolling width of the road roller can be varied within wide limits. When the rolls extend perpendicularly to the arms 5a an& &a» a mean roil width is obtained. When the rolls 1a and 2a are pivoted-in in the direction towards the central beam 4a, the width can be limited to the length of the rolls. The rolls overlap completely in respect ly in each specific case, it is possible to- achieve a width of the path to be rolled which corresponds to twice che length of the roll. By means of an appropriate angular position of the rolls, any intermediate width of the strip to be rolled can be adjusted, in which case the rolls are in each case parallel to each other.

Figures 3 to 5 show the road roller of Figure 1 , with constructional details thereof. Arranged on the central beam 4 of the frame 3, is the driving motor 11 , the fuel tank being designated 12 and the air-suction containers 13 · un the motor is a transmission 14 having the conUrol levers 15 and 16 for forward and reverse travel and for switching-in the vibration shaft, the control levers ί,βίη¾·, if desired, positioned on the same side. Connected with the transmission is the driving V-belt pulley 17 , from which the V-belt 18 extends to the belt pulley 19 which is fast on the shaft 20 mounted in bearings 21 and 22 in the central beam 4. Disposed at each end of the shaft 20 is a gear wheel 23 meshing with che driving wheel 24, via two gear wheels 25 and 26. The gear wheel 24 is connected with the follow shaft 27 carrying the flange-sleeve 23 which is pivotally mounted relatively to the stationary frame projection 7» b means of the bearing 29 , and is fast with the inner transverse wall 3 of the roll 1 . The same driving members for the rolls 1 and 2 are arranged in both frame arms.

Both rolls can be provided with a vibration device, by means of an unbalanced shaft. For this purpose, use is made of a separate drive derived from the belt pulley 31 of the transmission 14. From the said is fast in rotation with the belt pulley 35, by means of the disc 3 . The disc 3 is fitted on a shaft 36 carrying a gear wheel 37 meshing with the gear wheel 38 of the shaft 39· With this arrangement, the shaft 39 is mounted in the lower part of the cen ral oeam 4 and produces the transmission of the Movement initiated at 33, in a manner which is identical in respect of both rolls 1 and 2. From the belt pulley 35 a belt 40 extends to the belt pulley 41 connected by means of the sleeve 42 to the shaft 43, mounted in the hollow shaft 27 by means of the bearings 44 and 45. At the free end of the shaft 43 is the unbalance weight 46.

The driving members are disposed in the removable housing box 47 and are partially mounted in bearings. The roll 8 1 and 2 are so arranged relatively to the driving members, in particular relatively to the flange-sleeve 28, that the rolls can be fit ted-on and changed in a similar manner to what takes place with the wheels of motor vehicles. After releasing the connection between the inner web 30 and the flange 28, the roll can be drawn off from the entire driving device. It is possible to utilise narrow or wide rolls, depending on whether narrow or wide surfaces are to be compacted.

The unbalance weights 46 rotate in the same direction of rotation, so that the downwardly directed centrifugal Cor vibratory) forces are effective alternatingly on the one and on the other roll. The road roller can be steered by means of a pole 48.

Figure 6 shows a tandem vibration roller wherein the rolls are driven independently of each other. 19 or 19a » both of the said pulleys being adapted to be driven from a common motor with transmission or, alternatively, by independent motors and transmissions, n the same direction or in different directions.

Each belt pulley 19 and 19a is connected with an independent shaft 20a or ?0b, each of the said shafts carrying a gear wheel 23a or 23b, the two shafts 20a and 20b being mounted independently of each other in the central beam , by means of the bearings 21 and 21a or 22a and 22b. The further gear wheels 25 mesh with the gear wheels 23a and 23b.

This mode of driving makes it possible to steer the road roller by varying the speed of the two rolls relatively to each other. At the sane tine, it is also possible to produce opposite running of the two rolls 1 and 2, so that it becomes possible to pivot the road roller almost within its own length, In the case of the road roller of the example of7 embodiment shown in Figures 7 to 10, the rolls 1a and 2a are pivotal and adjustable in the frame 3a · The frame consists of the central beam 4-a and the frame arms 5a and 6a. The pivoting of the rolls takes place about the journals 10 mounted in the frame arms 5a or 6a.

Mounted for pivoting about the journals O is a forked axle 5 having fork' elements 50a, the roll being mounted for pivoting about the pivot 50 by means of the bearings 5 and 52. Connected with the fork element 50a is a rigidly secured arm 51 on which the actuating device for pivoting the rolls is able to act. In the case of the example illustrated, what is concerned is a hydraulic - - central beam 4a of the frame, in order that the piston rod may act on the end of the arm 1 · As the adjusting device, use may be made of a mechanically operating device, for example a screw-threaded spindle engaging with a nut :>ivotally arranged on the arm 51 , the screw-threaded spindle also being articulated to the frame. In the case of the example according to Figure 11, the am 5"1 is provided with a toothed segment 55 meshing with a gear whe.l 56 adapted to be driven in appropriate manner and in the opposite'direction of rotation.

The drive is effected through the agency of a motor 11a, via gearing 14a. The drive is taken off by the externally-positioned belt pulley 17a , the belt 18a and the beltpulley 19a , arranged on the shaft 20c.

The shaft 20c is in the central beam 4a of the frame and is mounted in the bearings 21c and 22c.

At the end of the shaft 20c are sprocket wheels 55 from which chains 56 lead to the sprocket wheels 57 » The said sprocket wheels are carried by the shaft 58 mounted in the bearings 59 and 60.

The shaft 58 is followed by a universal-joint shaft 61, 62, the free ends of which are provided with the universal joints 63 and 64 and are able to move somewhat, in known manner, in the axial direction relatively to each other. Connected with the joint 64 is a shaft 65 carrying a gear wheel 66. With the gear wheel 66 mesh intermediate gear wheels 67 engaging in an inner gearing 63 fast with a transverse wall 69 of the roll 1a. The pivots 70 of the planet wheels 67 are mounted in speed of the rolls 1a can be achieved.

The pivoting range of the rolls depends mainly on the spacing between the rolls and the frame arms and also from the central beam of the frame. As a rule, a pivoting angle from the normal position as far as maximum deflection in one direction involving an angle of approximately 20 to 25° will suffice, so that the entire pivoting range of the rolls 40 may attain 0°.

The space available at the end-face sides of the frame arms 5 and 6 or of the rolls is suitable for accommodating the motor and the transmission, by which means a lower centre of gravity is achieved. By this means, the road roller is secured against tilting also during the rolling-down of eloping ground. The tandem road roller having angularly-adjustable rolls is suitable in particular for the rolling and smoothing of dense tar surfacing. There are no limits to the size and operative weight.

In the cuse of the embodiment illustrated in Figures 12 to 14, wherein the driving sources for the travel drive and for the driveof the unbalanced shafts are separate, the motor for the travel drive is designated 71· This motor is provided with a transmission 2 from which separate take-offs extend to the rolls 1 and 2. On the shaft 73» having an interposed clutch 74, is the gear wheel 75 meshing with the gear wheel 76 connected with the driving shaft of the roll 2. A further shaft 77» having an interposed clutch 78, moves the gear wheel 79 driving, via an with the driving shaft for the roll 1. By means of t e clutches 74 and 78, the rolls 1 and 2 can be selectively put into operation, and in this connection it is also possible to leave one roll undriven. By mais of suitable reversing gearing, the direction of travel of the rolls can be varied.

For driving the vibration shafts 82 and 83, use is made of the motor 84- which must, as a general rule, be substantially stronger than the motor 1 for the travel drive. Disposed on the motor shaft 85 is the belt pulley 86, from which a belt 87 , preferably a toothed belt, leads to the belt pulley 88 the shaft 89 of which carries the belt pulley 90 . From the latter a toothJbelt 91 extends to the belt pulley 92 connected with the vibration shaft 83. The motor 84 for the vibration drive can also be provided with an adjustable transmission 4a.

With the frame arms 5 and 6, it is possible to connect carriers or supports 93 and 4- connected by transverse supports 95 and 96 with the retaining device for the driving device for the travel drive or for the vibration shaft.

The supports 93 and 94 can also be lightly supported on the outer end of the rolls 1 and 2.

The driver's seat 95 may be arranged on the central

Claims

1. Tandem road roller having rolle arranged one behind the other in the direction of travel, on a frame, all the rolls being drivable, characterised in that each roll is mounted overhung on the frame and in that the rolls disposed one behind the other are laterally offset relatively to each other and each roll projects, with its free end, laterally beyond the frame,

2. Road roller according to claim 1, characterised

3. in that the frame h ;s a central beam extending transversely of the direction of travel and arms extending perpendicularly from the ends of the central beam, in opposite directions.

4. 3· Road roller according to claim 1 or 2, characterised in that the rolls are rigidly mounted on the anas of the frame* 4· Road roller according to claim 1 or 2, characterised in that the rolls are mounted for pivoting and adjustment on the arms of the frame.

5. · Road roller according to any one of claims 1 to 4, characterised in that each roll is provided with an unhaLance shaft and in that the unbalance weight is mounted overhung.

6. Road roller according to any one of claims 1 to 5# characterised in that the roll has a transverse web and is secured by means of the said trannverse web to a driven part in such manner that it can be outwardly drawn off.

7. · Road roller according to any one of claims 1 to 6, characterised in that there are arranged in the central beam of the frame both the transmission shafts for driving the rolle and also the shaft for driving the unbalance weights, these shafts being arranged one below the other.,

8. Road roller according to claims 1, 2 and 4» characterised 25239/2 about vertical journals on the frame arm, and in that the roll pivo has an arm which is rigidly arranged thereon and on which an actuating device, for example, an hydraulic lifting element or a mechanical pivoting device engages.

9. » Road roller according to claim 8, characterised in that there is arranged in the roll pivot articulated to the journal a universal-joint shaft at the end of which reduction gearing is conn cted with the roll*

10. · Road roller according to claim 9, characterised in that the reduction gearing at the end of the universal-joint shaft is designed as planet gearing*

11. Road roller according to any one of claims 1 to 10 characterised in that the rolls are adapted to be driven in common.

12. Road roller according to any one of claims 1 to 10 characterised in that therolls are adapted to be driven independently of each other and/or at varying speeds or in opposite directions.

13. * Tandem road roller according to claim 1, characterised in that the drives for travel of the tandem road roller and for vibration of the rolls are arranged independently of each other at the side of the frame remote from each roll.

14. Road roller according to claim 13, characterised in that the central beam of the frame is arranged, as a compact element, in the direction of travel of the rolls.

15. Road roller according to claim 13 or 14» characterised in that the connected transmission members are provided on the motor for vibration drive, in the central arm 4 of the frame above the transmission members during travel drive.

16. Road roller according to any one of claims 13 to 15 each of which is equipped with a clutch extend from the transmission for the travel drive to the rolls* 14