EP2432971A1 - Synchronising system of at least two hydraulic motors - Google Patents

Synchronising system of at least two hydraulic motors

Info

Publication number
EP2432971A1
EP2432971A1 EP10727974A EP10727974A EP2432971A1 EP 2432971 A1 EP2432971 A1 EP 2432971A1 EP 10727974 A EP10727974 A EP 10727974A EP 10727974 A EP10727974 A EP 10727974A EP 2432971 A1 EP2432971 A1 EP 2432971A1
Authority
EP
European Patent Office
Prior art keywords
motor
feeding circuit
hydraulic
hydraulic feeding
detection means
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.)
Withdrawn
Application number
EP10727974A
Other languages
German (de)
French (fr)
Inventor
Elio Arnulfo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolfo SpA
Original Assignee
Rolfo SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolfo SpA filed Critical Rolfo SpA
Publication of EP2432971A1 publication Critical patent/EP2432971A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
    • F01C20/02—Control of, monitoring of, or safety arrangements for, machines or engines specially adapted for several machines or engines connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators

Definitions

  • the present invention refers to a system for synchronising the operation of at least two hydraulic motors, in particular for trucks for0 transporting motor vehicles e trailers.
  • one of the normally used systems for lifting the upper flatbeds is composed of two sliding guides, one for each vehicle side, in which the flatbed support can linearly move on a5 vertical axis.
  • Such support can be moved by a kinematism of the "worm screw - nut screw” type.
  • the two right and left "worm screw - nut screw” kinematisms must synchronously0 move, otherwise the flatbed can get slanted on one side, generating a load anomaly, in addition to an aesthetic defect.
  • object of the present invention is solving the above prior art problems, by providing a system for synchronising the operation of at least two hydraulic motors, in particular for trucks for transporting motor vehicles and trailers, which lacks the mechanical interconnection means between the two screws necessary for synchronising the motors in prior art systems .
  • Another object of the present invention is providing a system for synchronising the operation of at least two hydraulic motors, in particular for trucks for transporting motor vehicles and trailers, that is less encumbrant, less expensive, lighter and more reliable than prior art synchronising systems.
  • FIG. 1 shows a block diagram of a preferred embodiment of the system for synchronising the operation of at least two hydraulic motors according to the present invention
  • FIG. 2 shows the block diagram of the system of FIG. 1 in a first synchronising mode thereof; and - FIG. 3 shows the block diagram of the system of FIG. 1 in a second synchronising mode thereof.
  • the synchronising system 1 comprises at least one first and one second motor, respectively Ml and M2, each one of which preferably directly keyed-in onto a respective worm screw of the system for lifting the flatbed of a truck for transporting motor vehicles or a trailer, in such a way as to remove any mechanical interconnecting component: advantageously, both motors Ml and M2 are mutually equal, of an orbital type and, in order to guarantee a certain degree of synchronism, are arranged in series along an hydraulic feeding circuit L by which they are actuated: with reference, in particular, to FIG.
  • the synchronising system 1 comprises at least first detection means Rl of a rotation speed of the first motor Ml and at least second detection means R2 of a rotation speed of the second motor M2, such detection means Rl, R2 cooperating with control and managing means C, preferably made as at least one electronic unit, to detect possible differences in rotation speed between the first motor Ml and the second motor M2 :
  • the hydraulic feeding circuit L further comprises at least one first by-passing line Bl of the first motor Ml, connected to the hydraulic feeding circuit L upstream of such first motor Ml by interposing first switching means between such first by-passing line Bl and such hydraulic feeding circuit L, and at least one second by-passing line B2 of the second motor M2, connected to the hydraulic feeding circuit L upstream of such second motor M2 by interposing second switching means between- such second by-passing line B2 and such hydraulic feeding circuit L, the first and second switching means, each one of which is preferably made as at least one solenoid valve, respectively El, E2,
  • the first detection means Rl are composed of at least one first phonic wheel Fl, operatively connected to the first motor Ml and rotated by this latter one during its operation, and of a respective first proximity sensor Sl communicating with such control and managing means C.
  • the second detection means R2 are composed of at least one second phonic wheel F2, operatively connected to the second motor M2 and rotated by this latter one during its operation, and of a respective second proximity sensor S2 communicating with such control and managing means C.
  • the detection means Rl, R2, and in particular the two proximity sensors Sl and S2 then detect the movement of the motors Ml and M2 sending a digital signal to the control and managing means C, which process such signals, in particular by "counting" the teeth of the two phonic wheels Fl, F2.
  • control and managing means C When the control and managing means C detect a difference between the two counts, and consequently a difference in rotation speed between the first motor Ml and the second motor M2 that therefore are not synchronised, they actuate the first or second switching means, and in particular the solenoid valve El or E2, related to the motor Ml or M2 that is faster, deviating the flow of the hydraulic feeding fluid from the hydraulic feeding circuit L to the respective bypassing, line Bl or B2.
  • control and managing means C detect, through the comparison of signals detected by the detection means Rl, R2, that the first motor Ml rotates faster than the second motor M2, the control and managing means C actuate the first switching means, and in particular the first solenoid valve El deviating the flow of the hydraulic feeding fluid from the hydraulic feeding circuit L to the first by-passing line Bl: in this way, the hydraulic feeding fluid by-passes the first motor Ml that slows down till it stops, while the second motor M2 normally continues operating.
  • control and managing means C detect, by comparing the signals detected by the detection means Rl, R2, that the rotation speed of the first motor Ml is again equal to that of the second motor M2, namely when the count of the teeth of the phonic wheels Fl, F2 by the proximity sensors Sl, S2 is "realigned", the control and managing means C again actuate the first switching means, and in particular the first solenoid valve El, deviating the flow of the hydraulic feeding fluid from the first by-passing line Bl to the hydraulic feeding circuit L, again feeding the first motor Ml and taking back the system 1 according to the present invention to its normal operating condition as shown in FIG. 1.
  • control and managing means C detect, by comparing the signals detected by the detection means Rl, R2, that the second motor M2 rotates faster than the first motor Ml, the control and managing means C actuate the second switching means, and in particular the second solenoid valve E2, deviating the flow of the hydraulic feeding fluid from the hydraulic feeding circuit L to the second by-passing line B2 : in this way, the hydraulic feeding fluid by-passes the second motor M2 that slows down till it stops, while the first motor Ml normally continues operating.
  • control and managing means C detect, by comparing the signals detected by the detection means Rl, R2, that the rotation speed of the second motor M2 is again equal to that of the first motor Ml, namely when the count of teeth of the phonic wheels Fl, F2 by the proximity sensors Sl, S2 is "realigned", the control and managing means C again actuate the second switching means, and in particular the second solenoid valve E2, deviating the flow of the hydraulic feeding fluid from the second by-passing line B2 to the hydraulic feeding circuit L, again feeding the second motor M2 and taking back the system 1 according to the present invention to its normal operating condition shown in FIG. 1.
  • the fact that the motors Ml, M2 are fed in series by the hydraulic feeding circuit L guarantees a certain degree of operating synchrony, even if the synchronising system 1 according to the present invention should fail.

Abstract

A synchronising system (1) is described, in particular for trucks for transporting motor vehicles and trailers, comprising at least one first and one second hydraulic motors (M1, M2) arranged in series along an hydraulic feeding circuit (L) by which they are actuated, at least first detection means (R1) of a rotation speed of the first motor (Ml) and at least second detection means (R2) of a rotation speed of the second motor (M2), the detection means (R1, R2) cooperating with the control and managing means (C), to detect differences in rotation speed between the first motor (M1) and the second motor (M2), such hydraulic feeding circuit (L) comprising at least one first by-passing line (B1) of the first motor (M1) connected with the hydraulic feeding circuit (L) upstream of the first motor (Ml) by interposing first switching means between the first by-passing line (B1) and the hydraulic feeding circuit (L), and at least one second by-passing line (B2) of the second motor (M2) connected to the hydraulic feeding circuit (L) upstream of the second motor (M2) by interposing second switching means between the second by-passing line (B2) and the hydraulic feeding circuit (L), the first and second switching means being actuated by the control and managing means (C).

Description

SYNCHRONISING SYSTEM OF AT LEAST TWO HYDRAULIC MOTORS
The present invention refers to a system for synchronising the operation of at least two hydraulic motors, in particular for trucks for0 transporting motor vehicles e trailers.
On known trailers, one of the normally used systems for lifting the upper flatbeds is composed of two sliding guides, one for each vehicle side, in which the flatbed support can linearly move on a5 vertical axis. Such support can be moved by a kinematism of the "worm screw - nut screw" type. In order to keep the flatbed horizontal, in a transverse plane, the two right and left "worm screw - nut screw" kinematisms must synchronously0 move, otherwise the flatbed can get slanted on one side, generating a load anomaly, in addition to an aesthetic defect. Such synchronism is normally guaranteed by the fact that the motion is provided by a single orbital motor, divided and kept5 synchronous by a mechanical interconnection between the two screws, performed through angular transmissions, joints, shafts and sleeves. These devices create an encumbrance that could be exploited to lower the vehicle load, at the same time imposing a high construction cost, a design constraint for housing the various components, a non-neglectable weight and important maintenance operations.
Therefore, object of the present invention is solving the above prior art problems, by providing a system for synchronising the operation of at least two hydraulic motors, in particular for trucks for transporting motor vehicles and trailers, which lacks the mechanical interconnection means between the two screws necessary for synchronising the motors in prior art systems .
Another object of the present invention is providing a system for synchronising the operation of at least two hydraulic motors, in particular for trucks for transporting motor vehicles and trailers, that is less encumbrant, less expensive, lighter and more reliable than prior art synchronising systems. The above and other objects and advantages of the invention, as will result from the following description, are obtained with a system for synchronising the operation of at least two hydraulic motors as described in Claim 1. Preferred embodiments and non-trivial variations of the present invention are the subject matter of the dependent claims .
It- will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) can be made to what is described, without departing from the scope of the invention, as claimed in the dependent claims.
The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example, with reference to the enclosed drawings, in which:
FIG. 1 shows a block diagram of a preferred embodiment of the system for synchronising the operation of at least two hydraulic motors according to the present invention;
FIG. 2 shows the block diagram of the system of FIG. 1 in a first synchronising mode thereof; and - FIG. 3 shows the block diagram of the system of FIG. 1 in a second synchronising mode thereof.
With reference to the Figures, it is possible to note that the synchronising system 1 comprises at least one first and one second motor, respectively Ml and M2, each one of which preferably directly keyed-in onto a respective worm screw of the system for lifting the flatbed of a truck for transporting motor vehicles or a trailer, in such a way as to remove any mechanical interconnecting component: advantageously, both motors Ml and M2 are mutually equal, of an orbital type and, in order to guarantee a certain degree of synchronism, are arranged in series along an hydraulic feeding circuit L by which they are actuated: with reference, in particular, to FIG. 1, it is p.ossible to note that under normal operation of the system 1 according to the present invention, the hydraulic feeding fluid, through the hydraulic feeding circuit L, crosses firstly the first motor Ml and from there it is sent to the second motor M2 before returning to its fluid tank (not shown) . In this way, since the two orbital motors Ml and M2 are identical and volumetric with the same displacement, the fluid flow-rate that crosses them is substantially the same, and they will rotate approximately at the same rotation speed: the differences between the rotation speeds will be mainly caused by hydraulic leakages, by the imperfect asymmetry of the system and its components, and by the not perfectly balanced load. In order to compensate these errors, the synchronising system 1 according to the present invention comprises at least first detection means Rl of a rotation speed of the first motor Ml and at least second detection means R2 of a rotation speed of the second motor M2, such detection means Rl, R2 cooperating with control and managing means C, preferably made as at least one electronic unit, to detect possible differences in rotation speed between the first motor Ml and the second motor M2 : the hydraulic feeding circuit L further comprises at least one first by-passing line Bl of the first motor Ml, connected to the hydraulic feeding circuit L upstream of such first motor Ml by interposing first switching means between such first by-passing line Bl and such hydraulic feeding circuit L, and at least one second by-passing line B2 of the second motor M2, connected to the hydraulic feeding circuit L upstream of such second motor M2 by interposing second switching means between- such second by-passing line B2 and such hydraulic feeding circuit L, the first and second switching means, each one of which is preferably made as at least one solenoid valve, respectively El, E2, being actuated by such control and managing means C.
Preferably, the first detection means Rl are composed of at least one first phonic wheel Fl, operatively connected to the first motor Ml and rotated by this latter one during its operation, and of a respective first proximity sensor Sl communicating with such control and managing means C. In parallel, the second detection means R2 are composed of at least one second phonic wheel F2, operatively connected to the second motor M2 and rotated by this latter one during its operation, and of a respective second proximity sensor S2 communicating with such control and managing means C. In the preferred embodiment of the system 1 according to the present invention shown in the Figures, the detection means Rl, R2, and in particular the two proximity sensors Sl and S2, then detect the movement of the motors Ml and M2 sending a digital signal to the control and managing means C, which process such signals, in particular by "counting" the teeth of the two phonic wheels Fl, F2. When the control and managing means C detect a difference between the two counts, and consequently a difference in rotation speed between the first motor Ml and the second motor M2 that therefore are not synchronised, they actuate the first or second switching means, and in particular the solenoid valve El or E2, related to the motor Ml or M2 that is faster, deviating the flow of the hydraulic feeding fluid from the hydraulic feeding circuit L to the respective bypassing, line Bl or B2.
In particular, with reference to FIG. 2, it is possible to note that if the control and managing means C detect, through the comparison of signals detected by the detection means Rl, R2, that the first motor Ml rotates faster than the second motor M2, the control and managing means C actuate the first switching means, and in particular the first solenoid valve El deviating the flow of the hydraulic feeding fluid from the hydraulic feeding circuit L to the first by-passing line Bl: in this way, the hydraulic feeding fluid by-passes the first motor Ml that slows down till it stops, while the second motor M2 normally continues operating. When the control and managing means C detect, by comparing the signals detected by the detection means Rl, R2, that the rotation speed of the first motor Ml is again equal to that of the second motor M2, namely when the count of the teeth of the phonic wheels Fl, F2 by the proximity sensors Sl, S2 is "realigned", the control and managing means C again actuate the first switching means, and in particular the first solenoid valve El, deviating the flow of the hydraulic feeding fluid from the first by-passing line Bl to the hydraulic feeding circuit L, again feeding the first motor Ml and taking back the system 1 according to the present invention to its normal operating condition as shown in FIG. 1.
In parallel, with reference to FIG. 3, it is possible to note that if the control and managing means C detect, by comparing the signals detected by the detection means Rl, R2, that the second motor M2 rotates faster than the first motor Ml, the control and managing means C actuate the second switching means, and in particular the second solenoid valve E2, deviating the flow of the hydraulic feeding fluid from the hydraulic feeding circuit L to the second by-passing line B2 : in this way, the hydraulic feeding fluid by-passes the second motor M2 that slows down till it stops, while the first motor Ml normally continues operating. When the control and managing means C detect, by comparing the signals detected by the detection means Rl, R2, that the rotation speed of the second motor M2 is again equal to that of the first motor Ml, namely when the count of teeth of the phonic wheels Fl, F2 by the proximity sensors Sl, S2 is "realigned", the control and managing means C again actuate the second switching means, and in particular the second solenoid valve E2, deviating the flow of the hydraulic feeding fluid from the second by-passing line B2 to the hydraulic feeding circuit L, again feeding the second motor M2 and taking back the system 1 according to the present invention to its normal operating condition shown in FIG. 1. In any case, advantageously, the fact that the motors Ml, M2 are fed in series by the hydraulic feeding circuit L guarantees a certain degree of operating synchrony, even if the synchronising system 1 according to the present invention should fail.

Claims

1. Synchronizing system (1), particularly for trailers, characterised in that it comprises at least one first hydraulic motor (Ml) and one second hydraulic motor (M2) arranged in series along one hydraulic feeding circuit (L) by which they are operated, at least first detection means (Rl) of a rotation speed of said first motor (Ml) and at least second detection means (R2) of a rotation speed of said second motor (M2), said detection means (Rl, R2) cooperating with control and management means (C) to detect any difference of rotation speed between said first motor (Ml) and said second motor (M2), said hydraulic feeding circuit (L) comprising at least one first by-passing line (Bl) of said first motor (Ml) connected to said hydraulic feeding circuit (L) upstream of said first motor (Ml) by interposing first switching means between said first by-passing line (Bl) and said hydraulic feeding circuit (L) , and at least one second by-passing line (B2) of said second motor
(M2) connected to said hydraulic feeding circuit
(L) upstream of said second motor (M2) by interposing second switching means between said second by-passing line (B2) and said hydraulic feeding circuit (L) , said first and second switching means being operated by said control and management means (C) .
2. Synchronizing system (1) according to claim 1, characterised in that, when said detection means (Rl, R2) detect a difference in rotation speed between said first motor (Ml) and said second motor (M2), said control and management means (C) operate said first or second switching means relative to the faster of said motors (Ml) or (M2) deviating a flow of hydraulic feeding fluid from said hydraulic feeding circuit (L) to a respective by-passing line (Bl) or (B2).
3. Synchronizing system (1) according to claim 1, characterised in that each of said motors (Ml, M2) is directly connected to a respective worm screw of a lifting system of a platform of said vehicle.
4. Synchronizing system (1) according to claim 1, characterised in that said motors (Ml, M2) are mutually equal and of an orbital-type.
5. Synchronizing system (1) according to claim 1, characterised in that said first switching means are at least one first solenoid valve (El) and said second switching means are at least one second solenoid valve (E2) .
6. Synchronizing system (1) according to claim 1, characterised in that said first detection means (Rl) are composed of at least one first phonic wheel (Fl) operatively connected to said first motor (Ml) and rotated by this latter one during its operation, and of a respective first proximity sensor (Sl) communicating with said control and management means (C) .
7. Synchronizing system (1) according to claim 1, characterised in that said second detection means (R2) are composed of at least one second phonic wheel (F2) operatively connected to said second motor (M2) and rotated by this latter during its operation, and of a respective second proximity sensor (S2) communicating with said control and management means (C) .
EP10727974A 2009-05-22 2010-04-27 Synchronising system of at least two hydraulic motors Withdrawn EP2432971A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2009A000391A IT1394796B1 (en) 2009-05-22 2009-05-22 SYNCHRONIZATION SYSTEM FOR AT LEAST TWO HYDRAULIC MOTORS.
PCT/IT2010/000186 WO2010134110A1 (en) 2009-05-22 2010-04-27 Synchronising system of at least two hydraulic motors

Publications (1)

Publication Number Publication Date
EP2432971A1 true EP2432971A1 (en) 2012-03-28

Family

ID=41464772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10727974A Withdrawn EP2432971A1 (en) 2009-05-22 2010-04-27 Synchronising system of at least two hydraulic motors

Country Status (3)

Country Link
EP (1) EP2432971A1 (en)
IT (1) IT1394796B1 (en)
WO (1) WO2010134110A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10087958B2 (en) * 2012-04-19 2018-10-02 Cascade Corporation Fluid power control system for mobile load handling equipment
EP3167701B1 (en) * 2015-11-10 2021-03-10 Macdon Industries Ltd. Sickle knife drive

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Publication number Priority date Publication date Assignee Title
JP2000265770A (en) * 1999-03-12 2000-09-26 Kinki Ishiko Kk Drive mechanism for construction machine
US7575402B2 (en) * 2006-07-06 2009-08-18 Toyota Motor Credit Corporation Vehicle transporter with screw actuators
US7658059B2 (en) * 2007-06-04 2010-02-09 Crary Industries, Inc. Synchronous drive for split sickle bars on harvester header

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010134110A1 *

Also Published As

Publication number Publication date
IT1394796B1 (en) 2012-07-13
ITTO20090391A1 (en) 2009-08-21
WO2010134110A1 (en) 2010-11-25

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