US3580147A

US3580147A - Vibratory road roller

Info

Publication number: US3580147A
Application number: US751429A
Authority: US
Inventors: Benno Kaltenegger
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-08-25
Filing date: 1968-08-09
Publication date: 1971-05-25
Anticipated expiration: 1988-05-25
Also published as: DE1634432C3; DE1634432B2; CH492080A; NL6811126A; BG23758A3; AT297777B; ES356291A1; AT305343B; SE332835B; IL30535A; GB1224782A; BE719884A; DK128459B; DE1634432A1; IL30535A0; FR1583588A; JPS517921B1

Abstract

This provides a vibratory road roller having at least two driven roller drums lying one behind the other in the direction of travel. The drums are carried by a rigid frame. The drums which are placed one behind the other are of different weights. In one embodiment of the invention the roller drums are also of different lengths. At least one of the roller drums has a vibration shaft which carries eccentric weights.

Description

United States Patent l 13,580,147

[72] inventor Benno'Kaltenegger [56] References Cited Kurhaustrasse 73-79, 5202 Bend Sieg, UNITED STATES P ATENTS 2,587,343 2/1952 Lind 94/5OX 1 PP 751,429 2,873,656 2/1959 Andersson 94/50 1 1968 2,878,731 3/1959 Kressin 94/50 [451 P Z 1971 3,048,089 8/l962 Kaltenegger 94/50 1 Pmmy Aug-25,1967 3,309,972 3/1967 Peters 94/50 [33] Germany [31 1 K63208 Primary Examiner-Jacob L. Nackenoff Attorney-Lowry, Rmehart and Markva ABSTRACT: This provides a vibratory road roller having at [54] g least two driven roller drums lying one behind the other in the wmg direction of travel. The drums are carried by a rigid frame. [52] U.S. 94/50 The drums which are placed one behind the other are of dif- [51] Int. E0lc 19/24 ferent weights. In one embodiment of the invention the roller [50] Ficldof Search 94/48, 49, drums are also of different lengths. At least one of the roller drums has a vibration shaft which carries eccentric weights.

PATENTEU MAY 2 5197! SHEET '1 BF 3 INVENTOR BEA/No Macrame-6G ER PATENTEU mes m: 3580 1 47 SHEET 3 or 3 A m nm m 2 I FI6.5

lb I

I i 5a /m 4 qr 26 36 INVENTOR BEN/v0 AM TE/VEGGER VIBRATORY ROAD ROLLER BACKGROUND OF THE INVENTION Vibratory road rollers wherein each roller drum is provided .driven by one motor. In addition, both of the roller drums are of the same weight. Therefore, the motor power for generating vibrations is uniformly distributed to both drums. In this way, each drum can be supplied with a maximum of about 50 percent of the available motor power. Such a vibratory road roller of the prior art produces a double number of strokes arising from the vibrations caused by the eccentric weights on each of the roller drums. However, only half the motor power is available for each stroke. That is, the predetermined available motor performance sets a practical limit of about 50 percent to the effect of the strokes of each drum of the roller.

SUMMARY OF THE INVENTION An object of the invention is to provide a vibratory road roller of the type mentioned hereinabove wherein the motor power available for vibratory work for a roller drum can be more economically utilized;

Another object of this invention is to provide a vibratory 7 road roller having driven roller drums lying one behind the other in a rigid frame wherein one roller drum is considerably heavier than the other.

Another objectof the invention is to provide a vibratory road roller having roller drums lying one behind the other in a shaft produce twice as much force without the need for greater motor power than has been utilized in the past.

A still further object of this invention is to provide a relatively heavy stroke using 100 percent of the motor power instead of two relatively weak strokes distributed between two drums which use about 50 percent of the total motorpower. In this way, a considerably more intensive vibratory effect of the road roller on the ground is achieved. The vibratory drum produces a strong vibratory stroke which is worth more than two relatively weak strokes.

In one embodiment of this invention, a vibratory shaft is provided for both roller drums. In this case, therefore, if it is necessary to use a smaller inertia force, only the vibratory shaft of the lighter roller drum need be driven. Less motor power may be taken up under these conditions.

The heavier roller drum in the road roller of this invention may be from about 30 percent to about 50 percent heavier than the other roller drum. However, the heavier roller drum may be more than 50 percent heavier than the other roller drum. In the latter instance, the heavier roller drum may weigh at least 50 percent of the overall weight of the road roller.

In another embodiment of the invention, the eccentric weights of the vibratory shaft of the heavier drum are greater in weight than those of the lighter drum. The ratio of the eccentric weights on one shaft to those on the other may correspond to about the ratio of the weights of the tires of the roller drums with respect to each other.

The invention contemplates the use of a clutch by which the motor can be selectively connected to drive the vibratory shaft of one or either of the drums. It is further contemplated that a reverse gear be provided to allow reverse travel for the road roller. The heavier drum is advantageously the front drum of the road roller.

The roller drums may be of different lengths with the heavier drum having a greater length than the lighter drum. One embodiment of the invention provides a structure wherein both drums ride with their side faces flush on the drive side of the road roller. The rigid frame is shaped on the other side to accommodate the different lengths of the roller drums and thereby provide a complete unit. With this structure, the road roller units can be coupled together so that a multiple-ganged roller unit can be provided. When'such a ganged roller unit is used, the middle strip of road in the direction of road roller travel does not remain uncompressed.

BRIEF DESCRIPTION OF DRAWINGS other objects of this invention will appear in the following description and appended claims, reference being made to the accompanying, drawings forming a part of the specification wherein like reference characters designate corresponding strokes on the ground caused by the vibration of the eccentric parts in the several views.

In the accompanying drawings, wherein illustrative embodiments of the invention are disclosed,

FIG. 1 shows a side view on the line H of FIG. 3 of a vibratory road roller made in accordance with this invention,

FIG. 2 is a side view corresponding to FIG. 1 includingthe drive for the vibratory shaft,

FIG. 3 is a sectional viewon the line III-III of FIG. 1,

FIG. 4 is a side view of'anothervibratory road roller made in accordance with this invention wherein the vibratory shafts of the roller drums may be selectively driven,

FIG. 5 is a plan view of a further embodiment of a vibratory roller of this invention wherein all superstructural parts have been omitted, and

FIG. 6 is a side view of the embodiment of FIG. 5 wherein the roller drums are ganged.

DESCRIPTION OF SPECIFIC EMBODIMENT A vibratory road roller generally designated 1 has two roller drums 2 and 3lying one behind the other in the direction of travel. The

roller drums

2 and 3 are set in a rigid frame having an upper cover plate 6 which joins two sides '4 and 5. The roller drum 2 has trunnions'8 mounted in bearings 7 at each side of the roller. The roller drum 3 is provided on each side with the axle parts 9 mounted in bearings 10 on the

sides

4 and 5. The road roller 1 is advantageously self-propelling. The roller 1 is driven through a gear means which includes gear wheels ll, 12, 13 and 14.

The

roller drums

2 and 3 have different weights. The drum 2 has a relatively light tire 2a, and the drum 3. has a relatively heavy tire 3a. The roller drum 3 may be from about 30 percent to 50 percent heavier than the drum 2. However, the weight of drum 3 may be made more than 50 percent heavier than that of drum 2. In this latter instance, the heavier drum 3 advantageously amounts to at least 50 percent of the overall weight of the road roller 1. The heavy drum 3 has a vibration shaft 15 on which eccentric weights 16 are mounted. The shaft 15 is rotatably mounted in bearings 17 in the axle parts 9. A pulley wheel 18 is mounted on an end 15a of the shaft 15.

A motor 19 is mounted on the

frame

4, 5 and 6 above the drum 2. The motor 19 can simultaneously drive the road roller 1 and the vibration shaft 15. The motor 19 is connected by a belt drive 20 to a gearbox 21 mounted in the middle of the road roller 1. The power from the motor 19 is'divided in the gearbox 21 between the road-drive gear means ll, -l2, l3 and 14 and the vibration shaft 15. A smaller part of the power goes to the road-drive gear means l1, 12, 13 and 14. A reversing gear (not shown) within the gearbox 21 is provided for'the reverse travel of the road roller 1. The larger portion of the power goes to the vibration shaft 15 by way of the pulley wheel 22. A toothed belt 23 connects the pulley wheel 22 to the belt pulley 18 for driving the vibration shaft 15. A pulley wheel 24 is inserted to apply tension to the toothed belt 23. The gear drive means 1,1, 12, 13 and 14 is located in a housing 25. The gear drive means l1, l2, l3 and 14 is located in a housing 25. The drive means 18, 22, 23 and 24 are located in the housing 26. The road roller 1 can be equipped with an insertable drawbar 27 for steering the road roller. The weight and size of the eccentric weights 16 are arranged to suit the tire 3a of the drum 3 in a manner known in theprior art. A gear shift lever. 28 allows selection of neutral, reverse or forward gears. A motor may be provided to independently drive the road roller 1 and the vibration shaft 15.

The road roller 1 is made sufficiently narrow to form a ground-compressing implement for consolidation work in a ditch. The motor 19 and gearbox 21 are therefore advantageously mounted one behind the other in the direction of travel since the motor 19 is capable of being mounted above the rear drum 2. As shown in FIGS. 1, 2 and 3, only the front drum 3 which has the heavier weight and therefore heavy inertia forces is equipped with a vibration shaft 15. The rear drum 2 is lighter and used to support the roller 1. The lighter drum 2 does not have a vibration shaft in this embodiment.

The lighter rear drum 2 is provided with a vibration shaft 29 carrying eccentric weights 30 as shown in the embodiment of FIG. 4. The weights 30 are correspondingly lighter than the weights 16 which are mounted on the shaft 15. That is, both

drums

2 and 3 are provided with eccentric weights. The vibration shaft 29 has-a laterally projecting pulley wheel 31 driven by a toothedbelt 32 from a pulley wheel 33. The pulley wheel 33 is independent of a pulley wheel (not shown) which drives the vibration shaft through toothed belt 23. A clutch may be provided for the pulley wheels which control the movement of the

pulley belts

32 and 23. In this way either the shaft 29 or the shaft 15, respectively, may be selectively driven by the motor 34. A road roller having the construction as shown in FIG. 4 enables the use of two possible types of vibration. The drum 3 having the heavier vibrator strokes may take up the full power of the motor 34 for the vibratory drive. If a lesser vibratory power is needed, only the rear vibratory shaft 29 is driven. The rear vibratory shaft 29 can theoretically deliver about one-half the inertia force of the vibratory shaft 15. This distribution of the delivery of inertia force is made in accordance with the weight ratios used in the eccentric weights and 16 and total weights of the

drums

2 and 3.

The motor 34 can be mounted side by side with the gear box when the road roller of this embodiment has a sufficient width. The gearbox 35 has a branch for the road drive with a corresponding clutch for neutral, forward and reverse gears. A ganged road roller shown in FIGS. 5 and 6 consists of units generally designated 1a and lb including

roller drums

2a, 3a and 2b, 3b, respectively. The

drums

3a, 3b are longer than the

drums

2a, 2b. In addition, the

drums

3a, 3b have thicker and heavier tires than the

drums

2a, 2b. The outer ends of the

drums

2a, 3a and 2b, 3b are in alignment with the frame side 4a on the drive side. The difference in length of the drums as shown necessitates the use of a stepped frame 5a. The stepped frame 5a follows the configuration of the offset

drums

2a, 3a and 2b, 3b. The transverse crosspieces 36 connect the roller sides and 5a. The

heavy drums

3a and 3b are mounted diagonally to one another in the ganged structure including units la and 1b as. are the

drums

2a and 2b. The

roller drums

2a, 3a, and 2b, 3b are offset to avoid leaving any uncompressed middle strip on the ground. The coupling of the units laand lbis effected by the use of elastic coupling units 37. In this example, the coupling units 37 are buffers composed of rubber. The coupling members 37 are mounted outside the area of movement of the

roller drums

2a, 3a and 2b, 3b. in this way, the units la and lb may be fixedly attached in a very close relationship. The coupling of each of the units In and lb with a motor and gearbox comes within the scope of this invention. Likewise, another embodiment may alternately provide for the units to be used together forming a road roller with only one motor and gearbox.

The specific weight of the relatively heavy tire 3a can be 1 from 500 kg. to 1,200 kg. depending on the desired size. The

roller will be about 1 to lOO.

While the road roller has been shown and described in detail, it is obvious that this invention is not to be considered as being limited to the exact form disclosed, and that changes in detail and construction may be made therein within the scopeof what is claimed, without departing from the spirit of this invention.

Having thus set forth and disclosed the nature of this invention, what I claim is:

l. A vibratory road roller comprising:

a. axle shafts mounted in a rigid frame structure;

b. said shafts being laterally displaced one behind the other in the direction of travel;

0. two roller drums mounted on said shafts;

d. one of said drums being considerably heavier than the other drums;

e. vibration-producing means including eccentric weights mounted on each of the shafts carrying the roller drums; the eccentric weights on the shaft carrying the heavier roller being heavier than the eccentric weights on the shaft carrying the lighter roller drums; and

. A vibratory road roller comprising: axle shafts mounted in a rigid frame structure;

in the direction of travel;

roller drums having substantially equal diameters mounted on said shafts;

d. one of said roller drums being considerably heavier than another of said drums;

e. vibration-producing means attached to at least the shaft of the heavier of said roller drums; and

f. motor means to supply power to each of the roller drums.

3. A vibratory road roller as defined in claim 2 wherein:

said vibration-producing means include eccentric weights mounted on at least one of the shafts.

4. A vibratory road roller as defined in claim 3 wherein:

there are two roller drums; and

said eccentric weights are mounted on the shaft carrying the heavier roller drum. Y

5. A vibratory road roller as defined in claim 3 wherein:

there are two roller drums; and I said heavier roller drum is longer than said lighter roller drum.

6. A vibratory road roller as defined in claim 2 wherein:

there are two roller drums; and

said heavier roller drum is about 30 percent to 50 percent heavier than the lighter roller drum.

7. A vibratory road roller as defined in claim 2 wherein:

there are two roller drums; and

said heavier roller drum is over 50 percent heavier than the lighter roller drum.

8. A vibratory road roller as defined in claim 2 wherein:

there are two roller drums; and

said heavier roller drum has a weight of at least 50 percent of the overall weight of the road roller.

9. A vibratory road roller comprising:

a. means mounting two axle shafts laterally displaced one behind the other in the direction of travel in a frame structure;

b. a roller drum having a tire mounted on each shaft;

c. one of said roller drum tires being considerably heavier than the other roller drum tire;

vibration-producing means attached to at least the shaft of the heavier roller drums;

e. said vibration-producing means including at least one eccentric weight mounted on each of the axle shafts;

f. the eccentric weight on the shaft carrying the heavier roller drum tire being heavier than the eccentric weight on the shaft carrying the lighter roller drum tire; and

g. the ratio of the weight of the heavier eccentric weight to the weight of the lighter eccentric weight corresponds to the ratio of the heavier roller drum tire weight to the lighter roller drum tire weight.

. motor means to supply power to each of the roller drums.

. said shafts being laterally displaced one behind the other 10. A vibratory road roller as defined in claim 9 further including: I

a clutch means to connect said motor means to drive either of the shafts carrying the eccentric weights.

1]. A vibratory road roller as defined in claim 9 wherein:

said motor means is located above the lighter roller drum.

12. A vibratory road roller as defined in claim 9 further including:

a gearbox means for housing gear means which connect the motor means to said roller drums; and said motor means and said gearbox means being located adjacent to each other in the middle of the road roller. 13. A vibratory road roller comprising: a. means mounting two axle shafts laterally displaced one behind the other in the direction of travel in a frame.

structure;

b. roller drums being mounted on said shafts;

0. one of said roller drums being considerably heavier than another roller drum;

d. the heavier drum being longer than the lighter drum;

c. said drums having end faces which are aligned on the drive side of the road roller;

f. said frame structure having a stepped configuration on the other side to follow the offset ends of the longer and shorter drums; v

g. vibration-producing means attached to at least the shaft of the heavier roller drum; and

h. motor means to supply power to each of the roller drums.

14. A vibratory road roller comprising: a. a frame structure including two frame units having two roller drums mounted on axle shafts laterally displaced one behind the other in the direction of travel within each frame unit and means connecting said frame units;

b. one of said rollers on said laterally displaced shafts being considerably heavier than the other roller drum in each said frame unit; 4

c. said heavier roller drum being longer than said lighter roller drum within each said frame unit;

d. said roller drums having end faces which are aligned on the drive side of the road roller;

e. each said frame unit having a stepped configuration on the other side to follow the offset sides of the longer and shorter roller drums within each unit;

f. vibration-producing means attached to at least one of the shafts;and

g. motor means to supply power to one roller drum.

15. A vibratory road roller as defined in claim 14 wherein:

said longer roller drums are diagonally disposed within said road roller frame structure; and

said shorter roller drums are diagonally disposed within said road roller frame structure.

l6. A vibratory road roller asidefined in claim 14 wherein:

said frame unit connecting means include elastic coupling members spaced respectively to the front and rear of the front and rear roller drums.

Claims

1. A vibratory road roller comprising: a. axle shafts mounted in a rigid frame structure; b. said shafts being laterally displaced one behind the other in the direction of travel; c. two roller drums mounted on said shafts; d. one of said drums being considerably heavier than the other drums; e. vibration-producing means including eccentric weights mounted on each of the shafts carrying the roller drums; f. the eccentric weights on the shaft carrying the heavier roller being heavier than the eccentric weights on the shaft carrying the lighter roller drums; and g. motor means to supply power to each of the roller drums.

2. A vibratory road roller comprising: a. axle shafts mounted in a rigid frame structure; b. said shafts being laterally displaced one behind the other in the direction of travel; c. roller drums having substantially equal diameters mounted on said shafts; d. one of said roller drums being considerably heavier than another of said drums; e. vibration-producing means attached to at least the shaft of the heavier of said roller drums; and f. motor means to supply power to each of the roller drums.

3. A vibratory road roller as defined in claim 2 wherein: said vibration-producing means include eccentric weights mounted on at least one of the shafts.

4. A vibratory road roller as defined in claim 3 wherein: there are two roller drums; and said eccentric weights are mounted on the shaft carrying the heavier roller drum.

5. A vibratory road roller as defined in claim 3 wherein: there are two roller drums; and said heavier roller drum is longer than said lighter roller drum.

6. A vibratory road roller as defined in claim 2 wherein: there are two roller drums; and said heavier roller drum is about 30 percent to 50 percent heavier than the lighter roller drum.

7. A vibratory road roller as defined in claim 2 wherein: there are two roller drums; and said heavier roller drum is over 50 percent heavier than the lighter roller drum.

8. A vibratory road roller as defined in claim 2 wherein: there are two roller drums; and said heavier roller drum has a weight of at least 50 percent of the overall weight of the road roller.

9. A vibratory road roller comprising: a. means mounting two axle shafts laterally displaced one behind the other in the direction of travel in a frame structure; b. a roller drum having a tire mounted on each shaft; c. one of said roller drum tires being considerably heavier than the other roller drum tire; d. vibration-producing means attached to at least the shaft of the heavier roller drums; e. said vibration-producing means including at least one eccentric weight mounted on each of the axle shafts; f. the eccentric weight on the shaft carrying the heavier roller drum tire being heavier than the eccentric weight on the shaft carrying the lighter roller drum tire; and g. the ratio of the weight of the heavier eccentric weight to the weight of the lighter eccentric weight corresponds to the ratio of the heavier roller drum tire weight to the lighter roller drum tire weight.

10. A vibratory road roller as defined in claim 9 further including: a clutch means to connect said motor means to drive either of the shafts carrying the eccentric weights.

11. A vibratory road roller as defined in claim 9 wherein: said motor means is located above the lighter roller drum.

12. A vibratory road roller as defined in claim 9 further including: a gearbox means for housing gear means which connect the motor means to said roller drums; and said motor means and said gearbox means being located adjacent to each other in the middle of the road roller.

13. A vibratory road roller comprising: a. means mounting two axle shafts laterally displaced one behind the other in the direction of travel in a frame structure; b. roller drums being mounted on said shafts; c. one of said roller drums being considerably heavier than another roller drum; d. the heavier drum being longer than the lighter drum; e. said drums having end faces which are aligned on the drive side of the road roller; f. said frame structure having a stepped configuration on the other side to follow the offset ends of the longer and shorter drums; g. vibration-producing means attached to at least the shaft of the heavier roller drum; and h. motor means to supply power to each of the roller drums.

14. A vibratory road roller comprising: a. a frame structure including two frame units having two roller drums mounted on axle shafts laterally displaced one behind the other in the direction of travel within each frame unit and means connecting said frame units; b. one of said rollers on said laterally displaced shafts being considerably heavier than the other roller drum in each said frame unit; c. said heavier roller drum being longer than said lighter roller drum within each said frame unit; d. said roller drums having end faces which are aligned on the drive side of the road roller; e. each said frame unit having a stepped configuration on the other side to follow the offset sides of the longer and shorter roller drums within each unit; f. vibration-producing means attached to at least one of the shafts; and g. motor means to supply power to one roller drum.

15. A vibratory road roller as defined in claim 14 wherein: said longer roller drums are diagonally disposed within said road roller frame structure; and said shorter roller drums are diagonally disposed within said road roller frame structure.

16. A vibratory road roller as defined In claim 14 wherein: said frame unit connecting means include elastic coupling members spaced respectively to the front and rear of the front and rear roller drums.