Industrial vehicle with device for releasing the undercarriages without disconnecting the hydraulic system

Abstract

An industrial vehicle includes at least a structure 1 with the chassis 3 and a pair of crawler undercarriages 2 each of which is driven by a hydraulic motor 5 which transmits the motion and the engine torque to a planetary gear unit 6 on which is keyed a drive wheel 4. The hydraulic motor 5 and the reduction gear 6 are not directly connected, but between them is interposed a transmission device 10. During the detachment operation of the crawler undercarriage 2 from the chassis 3, the hydraulic motor 5 is released from the device of transmission 10 and remains attached to the chassis 3, preserving its hydraulic connections, while the planetary gear unit 6 and the transmission device 10 remain fixed to the undercarriage 2.

Claims

1. An industrial vehicle, comprising: at least one structure with a chassis and a pair of crawler undercarriages, each of which is driven by a hydraulic motor which transmits motion and torque to a planetary gearbox on which a drive wheel is keyed; and hooking-release means for releasing the crawler undercarriages from said chassis; wherein the hydraulic motor and the planetary gearbox are interconnected through the interposition of at least one transmission device; wherein said at least one transmission device is coaxial to the hydraulic motor and the planetary gearbox; and wherein following the operations for releasing the crawler undercarriage from the chassis, the hydraulic motor is released from the at least one transmission device and remains integral to the chassis, keeping its hydraulic connections intact while the planetary gearbox and the at least one transmission device remain integral to the crawler undercarriage.

2. The industrial vehicle according to claim 1, wherein the at least one transmission device comprises a shaft, a hub and a hollow sleeve; the shaft and the hub being adapted to transmit motion and driving torque from the hydraulic motor to the gearbox, and wherein the hollow sleeve, which accommodates the shaft and the hub, connect respective flanges of the hydraulic motor and of the gearbox.

3. The industrial vehicle according to claim 2, wherein the hub is hollow and internally bearing a grooved profile with radial toothing and dimensions suitable for matching with a grooved male shaft of the hydraulic motor.

4. The industrial vehicle according to claim 3, wherein the hub internally has a seat for a snap ring which serves as an abutment for the correct positioning of the shaft.

5. The industrial vehicle according to claim 3, wherein being grooved, the hub allows removing the shaft of the hydraulic motor such that said motor remains integral to the chassis and supported thereby.

6. The industrial vehicle according to claim 2, wherein the shaft has a grooved profile with radial toothing at one end and dimensions suitable for mating with a grooved hollow shaft of the gearbox, the shaft having at an other end, a grooved profile with radial toothing and dimensions suitable for mating with the hub.

7. The industrial vehicle according to claim 2, wherein the hollow sleeve bears two flanges at the ends, one with dimensions and drilling suitable for being coupled and bolted to the flange of the hydraulic motor and one with dimensions and drilling suitable for being coupled and bolted to the flange of the gearbox; the distance between the two flanges and thereby the length of the hollow sleeve being defined by the length of the shaft.

8. The industrial vehicle according to claim 2, wherein the hollow sleeve internally bears a seat for housing at least one bearing adapted to support the sleeve and the shaft.

9. An industrial vehicle, comprising: at least one structure with a chassis and a pair of crawler undercarriages, each of which is driven by a hydraulic motor which transmits motion and torque to a planetary gearbox on which a drive wheel is keyed; and hooking-release means for releasing the crawler undercarriages from said chassis, wherein the hydraulic motor and the planetary gearbox are interconnected through the interposition of at least one transmission device, wherein following the operations for releasing the crawler undercarriage from the chassis, the hydraulic motor is released from the at least one transmission device and remains integral to the chassis, keeping its hydraulic connections intact while the planetary gearbox and the at least one transmission device remain integral to the crawler undercarriage, wherein the at least one transmission device comprises a shaft, a hub and a hollow sleeve; the shaft and the hub being adapted to transmit motion and driving torque from the hydraulic motor to the gearbox, wherein the hollow sleeve, which accommodates the shaft and the hub, connect respective flanges of the hydraulic motor and of the gearbox, and wherein the hub is hollow and internally bearing a grooved profile with radial toothing and dimensions suitable for matching with a grooved male shaft of the hydraulic motor.

10. The industrial vehicle according to claim 9, wherein the hub internally has a seat for a snap ring which serves as an abutment for the correct positioning of the shaft.

11. The industrial vehicle according to claim 9, wherein being grooved, the hub allows removing the shaft of the hydraulic motor such that said motor remains integral to the chassis and supported thereby.

12. An industrial vehicle, comprising: at least one structure with a chassis and a pair of crawler undercarriages, each of which is driven by a hydraulic motor which transmits motion and torque to a planetary gearbox on which a drive wheel is keyed; and hooking-release means for releasing the crawler undercarriages from said chassis, wherein the hydraulic motor and the planetary gearbox are interconnected through the interposition of at least one transmission device, wherein following the operations for releasing the crawler undercarriage from the chassis, the hydraulic motor is released from the at least one transmission device and remains integral to the chassis, keeping its hydraulic connections intact while the planetary gearbox and the at least one transmission device remain integral to the crawler undercarriage, wherein the at least one transmission device comprises a shaft, a hub and a hollow sleeve; the shaft and the hub being adapted to transmit motion and driving torque from the hydraulic motor to the gearbox, wherein the hollow sleeve, which accommodates the shaft and the hub, connect respective flanges of the hydraulic motor and of the gearbox, and wherein the shaft has a grooved profile with radial toothing at one end and dimensions suitable for mating with a grooved hollow shaft of the gearbox, the shaft having at another end, a grooved profile with radial toothing and dimensions suitable for mating with the hub.

Description

DRAWINGS

(1) This and other characteristics will emerge more clearly from the following description of some embodiments illustrated, purely by way of non-limiting examples in the accompanying drawing tables.

(2) FIGS. 1 and 2 illustrate two portions of a machine tool, precisely an industrial vehicle with a device for the release of the undercarriages according to the prior art,

(3) FIG. 3: illustrates a section view of the chassis and crawler undercarriage, in correspondence with a driving wheel, according to the invention

(4) FIGS. 4 and 5: illustrate an exploded view of the components that contribute to realize the connection between the hydraulic motor and the gearbox of the hydraulic motor.

DETAIL OF THE INVENTION

(5) With particular reference to the figures, referring number 1 indicates the supporting and movement's lower structure of an industrial vehicle (not shown).

(6) Example of a vehicle's application is the so-called Pipelayers machines, an equipment used in the activity of laying and installation of piping.

(7) The vehicle generally includes: An operator post, A power train, An electrical system, A hydraulic system, Appropriate equipment for pipe laying applications, A lower carriage of advancement,

(8) The object of the present invention is directed in the lower part of said vehicle, namely chassis and undercarriage.

(9) Specifically, said lower part of the vehicle 1 is defined by a structure with a chassis 3 or central unit frame. A pair of crawler undercarriages 2 (also known as tracked undercarriages) are linked to said chassis 3 in order to allow the advancement of the structure and the vehicle in general.

(10) Each of said crawler undercarriages 2 comprises a series of load-bearing rollers that allow to uniformly discharge the weight of the caterpillar tractor on the ground; said supporters rollers guide and support both the track shoes (at the top) and a pair of wheels, precisely a first front idle wheel and a second rear wheel driving 4.

(11) Each of said crawler undercarriages 2 is driven by a hydraulic motor 5 which transmits motion and torque to a planetary gearbox 6 on which a drive wheel 4 is keyed;

(12) Said hydraulic motor 5 is generally of the piston-type and is powered by a hydraulic system installed on the chassis 3.

(13) The vehicle comprises hooking-release means for releasing the undercarriages 2 from said chassis 3.

(14) The hydraulic motor 5 and the reduction gearbox 6 are not directly connected; in detail, the hydraulic motor 5 and the gearbox 6 are interconnected through the interposition of at least one transmission device 10.

(15) Following the operations for releasing the crawler undercarriage 2 from the chassis 3, the hydraulic motor 5 is released from the transmission device 10 and remains integral to the chassis 3, keeping its hydraulic connections intact while the planetary gearbox 6 and the transmission device 10 remain integral to the undercarriage 2.

(16) Said transmission device 10 comprises a shaft 7, a hub 8 and a hollow sleeve 9.

(17) The shaft 7 and the hub 8 are adapted to transmit motion and driving torque from the hydraulic motor 5 to the gearbox 6.

(18) The hollow sleeve 9, which accommodates the shaft 7 and the hub 8, connect the respective flanges of the hydraulic motor 5 and of the gearbox 6.

(19) The hub 8 is hollow and internally bearing a grooved profile with radial toothing and dimensions suitable for matching with a grooved male shaft 13 of the hydraulic motor 5.

(20) Said hub 8 on one side matches the male shaft 13 and on the other side matches the shaft 7.

(21) The shaft 7 has a grooved profile with radial toothing at one end and dimensions suitable for mating with a grooved hollow shaft 14 of the gearbox 6; at the other end, it has a grooved profile with radial toothing and dimensions suitable for mating with the hub 8.

(22) The hub 8 internally has a seat for a snap ring 15 which serves as abutment for the correct positioning of the shaft 7.

(23) By the shaft 7 and hub 8 the torque is transmitted from the hydraulic motor 5 to the gearbox 6. Being the hub 8 grooved, in addition to transmit the torque it allows to easily remove the male shaft 13 of the hydraulic motor 5.

(24) Hydraulic motor 5 and gearbox 6 are connected also by the hollow sleeve 9 which bears two flanges 11, 12 at the ends; the flange 11 has dimensions and drilling suitable for being coupled and bolted to the flange of the hydraulic motor 5; the flange 12 has dimensions and drilling suitable for being coupled and bolted to the flange of the gearbox 6.

(25) The distance between the two flanges and thereby the length of the hollow sleeve 9 is defined by the length of the shaft 7.

(26) The hollow sleeve 9 internally bears a seat for housing at least one bearing 16 adapted to support the sleeve 8 and the shaft 7.

(27) It should be appreciated that the apparatus and methods of the present invention are capable of being incorporated in the form of a variety of embodiments, only a few of which have been illustrated and described above.

(28) For example, according to another aspect of the invention shaft 7 and hub 8 may be welded together or formed integrally instead of being assembled.

(29) So, while an embodiment of the present invention has been described herein, those with skill in this art will recognize changes, modifications, alterations and the like which still shall come within the spirit of the inventive concept, and such are intended to be included within the scope of the invention as expressed in the following claims.

(30) When it becomes necessary to perform the release of the crawler undercarriages 2 from the central chassis 3, for example to facilitate the transportation, the steps are the following: disconnecting the flange of the hydraulic motor 5 from the flange 11 of the hollow sleeve 9 to which it is bolted; pulling the shaft 13 of the hydraulic motor 5 from the hub 8 splined.

(31) In this way, the motor 5 remains attached to the chassis 3 which is equipped with suitable means to support it; since to the chassis 3 is also integral the hydraulic system, it is not necessary disconnections of the circuit that in this way remains closed.

(32) By the term of crawler or tracked undercarriages must be intended both classic-iron tracks and rubber-band tracks, for example the ones used in excavators, and dump truck.