CA1110297A - Track for cross-country vehicles and machines - Google Patents
Track for cross-country vehicles and machinesInfo
- Publication number
- CA1110297A CA1110297A CA333,368A CA333368A CA1110297A CA 1110297 A CA1110297 A CA 1110297A CA 333368 A CA333368 A CA 333368A CA 1110297 A CA1110297 A CA 1110297A
- Authority
- CA
- Canada
- Prior art keywords
- track
- steel structure
- links
- track plates
- soil
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 229920001971 elastomer Polymers 0.000 claims abstract description 25
- 239000002689 soil Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000000806 elastomer Substances 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 description 8
- 239000000543 intermediate Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- 229920001875 Ebonite Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
- B62D55/26—Ground engaging parts or elements
- B62D55/28—Ground engaging parts or elements detachable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D49/00—Tractors
- B62D49/06—Tractors adapted for multi-purpose use
- B62D49/0621—Tractors adapted for multi-purpose use comprising traction increasing arrangements, e.g. all-wheel traction devices, multiple-axle traction arrangements, auxiliary traction increasing devices
- B62D49/0635—Tractors adapted for multi-purpose use comprising traction increasing arrangements, e.g. all-wheel traction devices, multiple-axle traction arrangements, auxiliary traction increasing devices using additional ground engaging means, e.g. endless tracks
Abstract
ABSTRACT
The invention relates to a track, especially for forestry vehicles and machines, which has high tensile strength and provides strong soil grip, but in spite thereof is gentle to the soil. According to the invention, the track is assembled of sections hingedly connected to each other, each section comprising a track plate (2) and two spaced links (3) com-prised in the traction members of the track, each such track plate (2) comprising a steel structure (12) in the form of a box-shaped construction as a carrier of and support for a pad (5) of elastomer material covering the outwardly facing side of the steel structure, which pad constitutes the soil contact for the respective track plates. Said structure has an intermediate portion (12a), which is narrower than the end portion (12b) so as to form cog gaps (6) for drivingly engaging with bars (9) formed as cogs on the wheels, over which the track is intended to be driven, and the links (3) connected to the track plates are by bolt connection detach-ably connected with the respective track plates (2).
The invention relates to a track, especially for forestry vehicles and machines, which has high tensile strength and provides strong soil grip, but in spite thereof is gentle to the soil. According to the invention, the track is assembled of sections hingedly connected to each other, each section comprising a track plate (2) and two spaced links (3) com-prised in the traction members of the track, each such track plate (2) comprising a steel structure (12) in the form of a box-shaped construction as a carrier of and support for a pad (5) of elastomer material covering the outwardly facing side of the steel structure, which pad constitutes the soil contact for the respective track plates. Said structure has an intermediate portion (12a), which is narrower than the end portion (12b) so as to form cog gaps (6) for drivingly engaging with bars (9) formed as cogs on the wheels, over which the track is intended to be driven, and the links (3) connected to the track plates are by bolt connection detach-ably connected with the respective track plates (2).
Description
1~ 2~7 This invention relates to a vehicle track, more precisely to a track for cross-country vehicles and machines, pref-erably such used in forestry and agriculture. The track is intended to be driven over wheels, preferably rubber wheels, which are provided with transverse bars acting as cogs, and which comprise at least two longitudinal spaced parallel traction members of steel material and transverse track plates interconnecting said traction members and each com-prising a steel structure.
Tracks f~r cross-country vehicles, comprising two spaced parallel longitudinal traction members of steel material and transverse arc-shaped bars also of steel material connect-ing said members are previously known and often used in combination with profiled tires at two-axle bogie construct-ions forestry machines of today normally are equipped with.
By using such steel tracks in combination with the profiled tires of two-axle bogie constructions, one has succe~ded in bringing about the grip required for advancing the machine, esp~cially on hard soil, and also a certain spread of load and force was achieved whereby to some extent the capacity of advancing on weak soil was improved. On the other hand,
Tracks f~r cross-country vehicles, comprising two spaced parallel longitudinal traction members of steel material and transverse arc-shaped bars also of steel material connect-ing said members are previously known and often used in combination with profiled tires at two-axle bogie construct-ions forestry machines of today normally are equipped with.
By using such steel tracks in combination with the profiled tires of two-axle bogie constructions, one has succe~ded in bringing about the grip required for advancing the machine, esp~cially on hard soil, and also a certain spread of load and force was achieved whereby to some extent the capacity of advancing on weak soil was improved. On the other hand,
2~7 however, one has not succedded by using these steel tracks, which are of sparse and aggressive type, to appreciably reduce the heavy soil wear in the form of, for example, grooves remaining in the soil, and the damages generally caused by modern forestry machines on growing trees and, above all, on the root systems of the trees. The soil wear and said damages caused by such steel tracks are very ex-tensive and, therefore, conventional forestry machines which, for example, are used for clear-felling cannot advantageously be utilized in sensitive areas such as younger forest, for example, for thinning work.
There exist, besides such steel tracks, solid rubber tracks with built-in metal reinforcements for use especially on light-weight cross-country vehicles, such as scooters and military track vebicles. The experience made with these tracks are also very positive in respect of advancing capacity on snowless soil as well as in snow. These solid rubber tracks have proved also to be very gentle to the supporting ground and they cause only insignificant soil wear and slight damages on the root system of growing trees. On the basis of this experience, serious experiments have been made to develop metal-reinforced solid rubber tracks for forestry machines, but these experiments have only proved that it is almost impossible to make reinforced solid rubber tracks with sufficient tensile strength. For forestry machines intended to operate in difficult terrain, solid rubber tracks even with built-in steel reinforcements have proved insufficient from a strength point of view, especially at uphill driving or on soil with difficult surface structure, which requires large traction forces. For obtaining these traction forces, a large grip on the soil and tracks with high strength are required. All these requirements, however, are not satisfied by conventional solid rubber tracks or rubber tracks with built-in reinforcements. A further disadvantage of the steel-reinforced rubber tracks is that ~hey cannot be divided, implying that the entire track must be exchanged when a portion thereof is damaged.
Experiments have been and still are being made also to combine steel tracks and solid rubber tracks. However, so far one has not succeeded in coping with the problems, which ; arise from the difference in strain between the tracks.
:
The present invention, therefore, has the object of producing a track especially for forestry machines, which track has substantially the same strength, and above all the same tensile strength as conventional steel tracks, and which is at least as gentle to the support as a solid rubber track, and which simultaneousl~j yields a sufficient grip on the soil and is divisible, so that in the event of damage on a track portion only this portion has to be exchanged.
.
2~t7 - 3a -.
: According to one broad aspect of this invention, a track for cross-country vehicles and machines, preferably for agricul-ture and forestry, intended to be driven over wheels, preferably rubber wheels, which are provided with transverse bars acting as cogs, and comprise at least two longitudinal spaced parallel traction members of steel material and track plates interconnecting said traction members and each comprising a steel structure, characterized in that the steel structure of every track plate consists of a box-shaped construction as a carrier of and support for a pad of elastomer material which covers the outwardly facing side of the steel structure and constitutes the soil : contact of the respective track plates, the intermediate portion of said structure being narrower than the end portions thereof so as to form cog gaps between the track plates for drivingly . engaging with the bars of the wheels, and that the traction members connected to the track plates consist of links hingedly connected between the track plates, and the links of every traction member are connected by bolt connection each with the steel structure of a track plate on that side of one end portion ~ which is remote from the pad.
':~
:'~
:. n~
~ik 111~2~7 The invention is described in greater detail in the following, with reference to the accompanying drawings, in which Fig. 1 is a perspective view of a forestry machine equipped with tracks according to the invention, Fig. 2 is an enlarged view from above of a section of the track according to the invention, Fig. 3 is a lateral view of said section, Fig. 4 is a section substantially along the line IV-IV
in Fig. 2, and Fig. 5 is a section along the line V-V in Fig. 3.
-The track according to the invention is assembled of a pluralityof uniformly designed and hingedly interconnected sections 1.
Every section comprises a track plate 2 and two steel links 3, which are spaced from each other and connected to the track plate surface remote from the soil. Said links 3 are hingedly connected by hinge pins (Figs. 2 and 5) to the links 3 of adjacent sections so as to form an endless track consisting of such sections. The said hingedly connected links 3 can be said to constitute the traction members of the track and, therefore, are dimensioned so that they take up the tensile forces and stresses, to which the track may be subjected when in operation.
., .
:, i a 2~7 The track plates 2 are provided on their side facing to the soil, i.e. on the side opposed to the links 3, with pads 5 of elastomer material, for example rubber, which constitute the contact surfaces of the track with the soil, and which between themselves and the links 3 form cog gaps 6 for co-operation with transverse bars designed as cogs on the wheels, in combination with which the track according to the invention is intended to be applied. The present track, namely, is intended to be driven over wheels, which are provided with bars acting as cogs. For exemplifying this, Fig. 1 shows a forestry machine in the form of a scooter with a two-axle bogie 7 equipped with tracks according to the invention and with wheels 3 adjusted thereto, which are pro-vided with transverse bars 9 designed for drivingly engaging with the cog gaps of the track. The wheels shown in Fig. 1 have a peripheral layer 11 of elastomer material, for example rubber and preferably hard rubber, attached to a steel rim 10, of which material also the bars 9 acting as cogs are designed integral with said layer 11. Any kind of direct metal to metal contact between track and wheel is hereby prevented, and thereby a source not only of noise but also of spark formation is eliminated. Though not shown, the track according to the invention, of course, can also be used in combination with other wheels, which are provided with bars designed for engaging with cog gaps in the track, and thus also with wheels, which are provided with tires having or being designed with such bars.
111~42~7 Every track plate 2 comprises a steel structure 12 as support for the elastomer pad 5, which structure has box-shape, the intermediate portion 12a of which is narrower than the end portions 12b to form said cog gaps 6 between the track plates. The steel structure, more precisely, consists of an upper plate 13 with flanges 14 along its longitudinal edges, and a lower plate 15, which is attached to said flanges,and the ends of which are bent upward and secured direclv on the upper plate 13, as shown in Fig. 4. Along this upward bent portion, the flanges 14 possibly designed integral with the upper plate 13, of course, have a height decreasing to said upward bent portion. The elastomer pad S
is rigidly connected, for example vulcanized, to the lower plate 15 of the steel structure and has such extension in width, that it entirely covers at least the steel structure surface facing to the soil and preferably also its end edges, as indicated at 16 in Fig. 4. These pads, thus, constitute the contact of the track with the soil, and owing to these elastomer and, therefore, elastic pads the contact of the track with the soil is very gentle. Besides, due a.o. to the location of the cog gaps of the track between the traction members abd be~ween the track plates, every pad has a relatively large bearing surface, which provides the necessary soil grip and distributes arising pressure forces. Pressure damages on roots and the like are thereby prevented to a very sub-stantial degree, and the advancing capacity of the machine is increased.
2~7 .~
On both sides of the intermediate portion 12a of the track plate designed for co-operation with the wheels, the links
There exist, besides such steel tracks, solid rubber tracks with built-in metal reinforcements for use especially on light-weight cross-country vehicles, such as scooters and military track vebicles. The experience made with these tracks are also very positive in respect of advancing capacity on snowless soil as well as in snow. These solid rubber tracks have proved also to be very gentle to the supporting ground and they cause only insignificant soil wear and slight damages on the root system of growing trees. On the basis of this experience, serious experiments have been made to develop metal-reinforced solid rubber tracks for forestry machines, but these experiments have only proved that it is almost impossible to make reinforced solid rubber tracks with sufficient tensile strength. For forestry machines intended to operate in difficult terrain, solid rubber tracks even with built-in steel reinforcements have proved insufficient from a strength point of view, especially at uphill driving or on soil with difficult surface structure, which requires large traction forces. For obtaining these traction forces, a large grip on the soil and tracks with high strength are required. All these requirements, however, are not satisfied by conventional solid rubber tracks or rubber tracks with built-in reinforcements. A further disadvantage of the steel-reinforced rubber tracks is that ~hey cannot be divided, implying that the entire track must be exchanged when a portion thereof is damaged.
Experiments have been and still are being made also to combine steel tracks and solid rubber tracks. However, so far one has not succeeded in coping with the problems, which ; arise from the difference in strain between the tracks.
:
The present invention, therefore, has the object of producing a track especially for forestry machines, which track has substantially the same strength, and above all the same tensile strength as conventional steel tracks, and which is at least as gentle to the support as a solid rubber track, and which simultaneousl~j yields a sufficient grip on the soil and is divisible, so that in the event of damage on a track portion only this portion has to be exchanged.
.
2~t7 - 3a -.
: According to one broad aspect of this invention, a track for cross-country vehicles and machines, preferably for agricul-ture and forestry, intended to be driven over wheels, preferably rubber wheels, which are provided with transverse bars acting as cogs, and comprise at least two longitudinal spaced parallel traction members of steel material and track plates interconnecting said traction members and each comprising a steel structure, characterized in that the steel structure of every track plate consists of a box-shaped construction as a carrier of and support for a pad of elastomer material which covers the outwardly facing side of the steel structure and constitutes the soil : contact of the respective track plates, the intermediate portion of said structure being narrower than the end portions thereof so as to form cog gaps between the track plates for drivingly . engaging with the bars of the wheels, and that the traction members connected to the track plates consist of links hingedly connected between the track plates, and the links of every traction member are connected by bolt connection each with the steel structure of a track plate on that side of one end portion ~ which is remote from the pad.
':~
:'~
:. n~
~ik 111~2~7 The invention is described in greater detail in the following, with reference to the accompanying drawings, in which Fig. 1 is a perspective view of a forestry machine equipped with tracks according to the invention, Fig. 2 is an enlarged view from above of a section of the track according to the invention, Fig. 3 is a lateral view of said section, Fig. 4 is a section substantially along the line IV-IV
in Fig. 2, and Fig. 5 is a section along the line V-V in Fig. 3.
-The track according to the invention is assembled of a pluralityof uniformly designed and hingedly interconnected sections 1.
Every section comprises a track plate 2 and two steel links 3, which are spaced from each other and connected to the track plate surface remote from the soil. Said links 3 are hingedly connected by hinge pins (Figs. 2 and 5) to the links 3 of adjacent sections so as to form an endless track consisting of such sections. The said hingedly connected links 3 can be said to constitute the traction members of the track and, therefore, are dimensioned so that they take up the tensile forces and stresses, to which the track may be subjected when in operation.
., .
:, i a 2~7 The track plates 2 are provided on their side facing to the soil, i.e. on the side opposed to the links 3, with pads 5 of elastomer material, for example rubber, which constitute the contact surfaces of the track with the soil, and which between themselves and the links 3 form cog gaps 6 for co-operation with transverse bars designed as cogs on the wheels, in combination with which the track according to the invention is intended to be applied. The present track, namely, is intended to be driven over wheels, which are provided with bars acting as cogs. For exemplifying this, Fig. 1 shows a forestry machine in the form of a scooter with a two-axle bogie 7 equipped with tracks according to the invention and with wheels 3 adjusted thereto, which are pro-vided with transverse bars 9 designed for drivingly engaging with the cog gaps of the track. The wheels shown in Fig. 1 have a peripheral layer 11 of elastomer material, for example rubber and preferably hard rubber, attached to a steel rim 10, of which material also the bars 9 acting as cogs are designed integral with said layer 11. Any kind of direct metal to metal contact between track and wheel is hereby prevented, and thereby a source not only of noise but also of spark formation is eliminated. Though not shown, the track according to the invention, of course, can also be used in combination with other wheels, which are provided with bars designed for engaging with cog gaps in the track, and thus also with wheels, which are provided with tires having or being designed with such bars.
111~42~7 Every track plate 2 comprises a steel structure 12 as support for the elastomer pad 5, which structure has box-shape, the intermediate portion 12a of which is narrower than the end portions 12b to form said cog gaps 6 between the track plates. The steel structure, more precisely, consists of an upper plate 13 with flanges 14 along its longitudinal edges, and a lower plate 15, which is attached to said flanges,and the ends of which are bent upward and secured direclv on the upper plate 13, as shown in Fig. 4. Along this upward bent portion, the flanges 14 possibly designed integral with the upper plate 13, of course, have a height decreasing to said upward bent portion. The elastomer pad S
is rigidly connected, for example vulcanized, to the lower plate 15 of the steel structure and has such extension in width, that it entirely covers at least the steel structure surface facing to the soil and preferably also its end edges, as indicated at 16 in Fig. 4. These pads, thus, constitute the contact of the track with the soil, and owing to these elastomer and, therefore, elastic pads the contact of the track with the soil is very gentle. Besides, due a.o. to the location of the cog gaps of the track between the traction members abd be~ween the track plates, every pad has a relatively large bearing surface, which provides the necessary soil grip and distributes arising pressure forces. Pressure damages on roots and the like are thereby prevented to a very sub-stantial degree, and the advancing capacity of the machine is increased.
2~7 .~
On both sides of the intermediate portion 12a of the track plate designed for co-operation with the wheels, the links
3 of every track section according to the invention are connected to the wide end portions 12b of the track plate by means of a bolt connection comprising a plurality of bolts 17. For these bolts through holes are provided in the upper plate 13 of the steel structure, and threaded holes are pro-vided in a reinforcement piece 18 of metal, which is secured between the uPper and lower plates 13,15 of the steel structure and located below the respective link 3. Said metal piece 18 provides a rigid attachment of the link through the bolts 17.
Owing to the box-shape of the steel structure,also a connect-ion substantially stiff against torsion..between the links 3 of every section is obtained. In order to ~revent the links 3 from turning relative to the steel structure 12, in addition to the protection against turning given by the bolt connect-ions, the links 3 are provided on their side facing toward the structure 12 with bars 19 and grooves 20, which accur-ately fit corresponding grooves and, respectively, bars in the upper plate 13 of the steel structure, as shown in greater detail in Fig. 4.
In the drawings, every link 3 is shown in the form of two halves 3a and, respectively, 3b, which can be said to have substantially open box-shape, comprising a bottom 21 abutting the steel structure, in the lower surface of which bottom said grooves and bars are formed, a rear piece 22 and two opposed side surfaces 23 extending in the longitudinal direction of t~e track. The link half 3a is provided in its p~rtion remote 2~97 from the rear piece 22 with a sleeve 24, the centre of which is located slightly outside the wide end portion of the steel structure and below the lowest point of the upper surface of the intermediate portion 12a, as shown in greater detail in Fig. 5. Through said sleeve the hinge pin 4 of the link extends surrounded by a rubber bushing 25 provided within the sleeve, so that some kind of torsion spring mechanism is obtained. Said hinge pin 4 is rigidly connected, for example by welding, to the link half 3b of the adjacent track section, of which half, like the llnk half 3b of the adjacent track section, the sides 22 are extended to form legs 26. Said legs 26 are located spaced from each other by a distance, which slightly exceeds the length of the sleeve 24 of the link half 3a, so that such a sleeve fits in therebetween, and each having an opening 27, in which the hinge pin is located with its ends and welded on the respective legs 26 about the openings 27. In other words, every hinge pin 4 is rigidly connected to one half of the link and extends rotatably through the other link half of the adjacent link, thereby effecting a very simple but relaiable joint between the different sections 1 of the track. One of the two links of every track section, as shown most clearly in Fig. 2, may be turned through 180 relative to the second link, but this is not per se necessary. In order to strengthen the connection between the two link halves of a link, the rear pieces of the two link halves facing toward each other can be bolted together by a bolt and nut 29, 30.
g In the drawings, the upper plate 13 of the steel structure is shown designed with stiffening beads 32, to the outside of which the links 3 abut with a portion of their bottom 21, and between which the intermediate portion 12a of the steel structure has a flatly concave arc-shape, as shown in Fig. 3.
The wheels carr~Jing the track then must have a corresponding convex arc-shape between their bars. The distance between these bars, thus, ib determined by the width of the inter-mediate portion 12a of the steel structure, while the bar division proper is determined by the distance between the hinge pins 4 of the track.
Due to the detachable connection between the track plates and the links effected by bolt connections, every damaged track plate can be exchanged in a simple manner, and due to the division of the links into two halves, also damaged links can be exchanged. Furthermore, due to the location of the hinge pins 4 below the lowest point of at least the inter-mediate portion 12a of the track plates, the pads can be designed with relativelv great thickness and, thus, are less aggressive, because the pads then permit to be compressed to some extent.
The present invention is not restricted to what is described above and shown in the drawings, but can be altered and modif-ied in many different ways within the scope of the invention idea defined in the claims. The pad surface facing toward the soil, for example, can be designed entirely smooth or with a pattern increasing the grip.
Owing to the box-shape of the steel structure,also a connect-ion substantially stiff against torsion..between the links 3 of every section is obtained. In order to ~revent the links 3 from turning relative to the steel structure 12, in addition to the protection against turning given by the bolt connect-ions, the links 3 are provided on their side facing toward the structure 12 with bars 19 and grooves 20, which accur-ately fit corresponding grooves and, respectively, bars in the upper plate 13 of the steel structure, as shown in greater detail in Fig. 4.
In the drawings, every link 3 is shown in the form of two halves 3a and, respectively, 3b, which can be said to have substantially open box-shape, comprising a bottom 21 abutting the steel structure, in the lower surface of which bottom said grooves and bars are formed, a rear piece 22 and two opposed side surfaces 23 extending in the longitudinal direction of t~e track. The link half 3a is provided in its p~rtion remote 2~97 from the rear piece 22 with a sleeve 24, the centre of which is located slightly outside the wide end portion of the steel structure and below the lowest point of the upper surface of the intermediate portion 12a, as shown in greater detail in Fig. 5. Through said sleeve the hinge pin 4 of the link extends surrounded by a rubber bushing 25 provided within the sleeve, so that some kind of torsion spring mechanism is obtained. Said hinge pin 4 is rigidly connected, for example by welding, to the link half 3b of the adjacent track section, of which half, like the llnk half 3b of the adjacent track section, the sides 22 are extended to form legs 26. Said legs 26 are located spaced from each other by a distance, which slightly exceeds the length of the sleeve 24 of the link half 3a, so that such a sleeve fits in therebetween, and each having an opening 27, in which the hinge pin is located with its ends and welded on the respective legs 26 about the openings 27. In other words, every hinge pin 4 is rigidly connected to one half of the link and extends rotatably through the other link half of the adjacent link, thereby effecting a very simple but relaiable joint between the different sections 1 of the track. One of the two links of every track section, as shown most clearly in Fig. 2, may be turned through 180 relative to the second link, but this is not per se necessary. In order to strengthen the connection between the two link halves of a link, the rear pieces of the two link halves facing toward each other can be bolted together by a bolt and nut 29, 30.
g In the drawings, the upper plate 13 of the steel structure is shown designed with stiffening beads 32, to the outside of which the links 3 abut with a portion of their bottom 21, and between which the intermediate portion 12a of the steel structure has a flatly concave arc-shape, as shown in Fig. 3.
The wheels carr~Jing the track then must have a corresponding convex arc-shape between their bars. The distance between these bars, thus, ib determined by the width of the inter-mediate portion 12a of the steel structure, while the bar division proper is determined by the distance between the hinge pins 4 of the track.
Due to the detachable connection between the track plates and the links effected by bolt connections, every damaged track plate can be exchanged in a simple manner, and due to the division of the links into two halves, also damaged links can be exchanged. Furthermore, due to the location of the hinge pins 4 below the lowest point of at least the inter-mediate portion 12a of the track plates, the pads can be designed with relativelv great thickness and, thus, are less aggressive, because the pads then permit to be compressed to some extent.
The present invention is not restricted to what is described above and shown in the drawings, but can be altered and modif-ied in many different ways within the scope of the invention idea defined in the claims. The pad surface facing toward the soil, for example, can be designed entirely smooth or with a pattern increasing the grip.
Claims (5)
1. A track for cross-country vehicles and machines, pref-erably for agriculture and forestry, intended to be driven over wheels, preferably rubber wheels, which are provided with transverse bars acting as cogs, and comprise at least two longitudinal spaced parallel traction members of steel material and track plates interconnecting said traction members and each comprising a steel structure, characterized in that the steel structure of every track plate consists of a box-shaped construction as a carrier of and support for a pad of elastomer material which covers the outwardly facing side of the steel structure and constitutes the soil contact of the respective track plates, the intermediate portion of said structure being narrower than the end portions thereof so as to form cog gaps between the track plates for drivingly engaging with the bars of the wheels, and that the traction members connected to the track plates consist of links hingedly connected between the track plates, and the links of every traction member are connected by bolt connection each with the steel structure of a track plate on that side of one end portion which is remote from the pad.
2. A track as defined in claim 1, characterized in that every link consists of two portions which are connected to the end portion of the steel structure by said bolt connection and independently of each other detachable from the steel structure of the associated track plate.
3. A track as defined in claim 2, characterized in that one link portion is rigidly connected to a hinge pin constituting the joint between two links, and the second link portion is provided with a sleeve designed for rotatably carrying such a hinge pin rigidly connected to an adjacent link.
4. A track as defined in claim 3, characterized in that the hinge pin in said sleeve is surrounded by a rubber bushing constituting a torsion spring mechanism.
5. A track as defined in claim 4, characterized in that the centre of rotation of the hinge pin between the track plates is located below a lowest point of the steel structure side facing toward the links.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7808903A SE413390B (en) | 1978-08-23 | 1978-08-23 | BAND FOR CLEANING VEHICLES AND MACHINES |
| SE7808903-4 | 1978-08-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1110297A true CA1110297A (en) | 1981-10-06 |
Family
ID=20335644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA333,368A Expired CA1110297A (en) | 1978-08-23 | 1979-08-08 | Track for cross-country vehicles and machines |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1110297A (en) |
| DE (1) | DE2933633A1 (en) |
| FI (1) | FI74915C (en) |
| FR (1) | FR2434075A1 (en) |
| NO (1) | NO153044C (en) |
| SE (1) | SE413390B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11254378B2 (en) | 2017-03-02 | 2022-02-22 | Contitech Transportbandsysteme Gmbh | Running gear chain, in particular bogie chain |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0129493B1 (en) * | 1983-06-20 | 1987-11-04 | André Lamy | Track for a vehicle having pneumatic tyres |
| US6076620A (en) * | 1997-02-21 | 2000-06-20 | Horsch; Michael | Agricultural machine |
| EP1008509B1 (en) * | 1997-09-05 | 2005-11-23 | Komatsu Ltd | Elastic flat tread |
| US6984006B2 (en) | 2000-03-03 | 2006-01-10 | Komatsu Limited | Elastic flat tread |
| CN104986432A (en) * | 2015-05-28 | 2015-10-21 | 毛志明 | Straw support pad and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2548626A (en) * | 1944-03-22 | 1951-04-10 | Kelsey Hayes Wheel Co | Track shoe |
-
1978
- 1978-08-23 SE SE7808903A patent/SE413390B/en not_active IP Right Cessation
-
1979
- 1979-08-08 CA CA333,368A patent/CA1110297A/en not_active Expired
- 1979-08-20 DE DE19792933633 patent/DE2933633A1/en not_active Withdrawn
- 1979-08-22 NO NO792721A patent/NO153044C/en unknown
- 1979-08-22 FI FI792624A patent/FI74915C/en not_active IP Right Cessation
- 1979-08-23 FR FR7921293A patent/FR2434075A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11254378B2 (en) | 2017-03-02 | 2022-02-22 | Contitech Transportbandsysteme Gmbh | Running gear chain, in particular bogie chain |
Also Published As
| Publication number | Publication date |
|---|---|
| SE413390B (en) | 1980-05-27 |
| FI74915C (en) | 1988-04-11 |
| NO153044C (en) | 1986-01-08 |
| FR2434075A1 (en) | 1980-03-21 |
| NO153044B (en) | 1985-09-30 |
| DE2933633A1 (en) | 1980-03-06 |
| FI74915B (en) | 1987-12-31 |
| NO792721L (en) | 1980-02-26 |
| SE7808903L (en) | 1980-02-24 |
| FI792624A (en) | 1980-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |