FR2751168A1 - TRANSMISSION SYSTEM FOR A LARGE BALE PRESS FOR AGRICULTURE - Google Patents

Abstract

The invention relates to a transmission system for a large baler. In order to minimize the lateral dimensions of the transmission, the connection between the motor shaft (48) which provides the driving force for driving the feed device (16) and the shaft (12) of said feed device The feed is at least partially achieved by a spur gear transmission or by several spur gears (56) mutually engaged.

Description

Transmission system for a large baler for

  agriculture The invention relates to a transmission system for a large baler, comprising a pressing chamber arranged in the longitudinal direction and open towards the rear, a press piston movable in a reciprocating movement inside said pressing chamber, devices for picking up the product to be harvested on the field, a feeder channel for storing a load of product at

  harvest and transport it to the pressing chamber using a device

  additional feeder, a tying device to tie the pressed bales as well as a transmission system for the training of all

functional elements.

  A large baler of this type is described in the document

  ment DD 299 455. Usually, large balers are

  towed by tractors and driven by an articulated shaft

  abutment connected to the tractor PTO. The driving force is transmitted to the main gearbox and from there is distributed to the different

  working bodies. The supply device that transports the product

  has to be harvested through the feeder channel into the pressure chamber

  sage is driven by a motor shaft which starts from the gearbox

  main and transmits the driving force via an additional bevel gear

  and an articulated tree. The additional bevel gear and the articulated shaft are relatively expensive elements and at least the articulated shaft works in areas of the large baler where there is a lot of dust. Thus the articulated shaft is subject to significant wear and must be subject to special attention during maintenance work. The bevel gears must be mounted laterally and the lateral distances from the points at which the driving forces are transmitted to the mechanics of the feeding device being greater, high bending moments appear in the feeding device, which bending moments , due to lever forces, load the bearings of the feeding device. Based on this situation, the objective of the present invention is to provide an inexpensive solution to the transmission of the driving force to the supply device, which occupies little space laterally and which

  furthermore operates with as little maintenance and wear as possible.

  This objective is achieved according to the invention by the fact that the connection

  between the motor shaft which provides the driving force for the driving device

  born and a driven tree of the feeding device is at least partially

  carried out from the drive point of view by a gear transmission

  straight or by several pinions with straight teeth mutually engaged.

  To simplify, we will only speak in the following of transmission with spur gears. The advantage of the spur gear transmission, in

  as long as the drive link is space-saving - for example-

  full width is only 10 cm - and the driving force can be trans-

  placed with weak bending moments on the driven shaft of the device

  of supply. The spur gears of the spur gear transmission can-

  can be placed in a closed transmission case, filled with oil,

  hence operation with reduced wear and practically maintenance-free

  from the chain of transmission. A spur gear transmission

  can also be manufactured at an advantageous cost.

  According to an arrangement of the invention, the drive shaft is arranged outside the circle of rotation of the arms of the cranks driving the press piston in order to limit as far as possible the distance to "bridge". The driven shaft of the feeding device should be located as close as possible to the motor shaft which provides the driving force for the feeding device in order

  that the drive link between the motor shaft and the driven shaft of the

  Feeding device can be realized with a spur gear transmission. So that the angle of inclination between the articulated shaft connected to the PTO of a tractor the input shaft of the main transmission driven by it is as small as possible, while maintaining a distance as reduced as possible between the drive shaft and the driven shaft of the feeder, the angle between an imaginary straight line connecting the drive shaft to the drive shaft of the crank arms and the straight line connecting the drive shaft and the driven shaft of the feeding device must be at least; preferably said two lines must form an obtuse angle. It is advantageous for this that the driven shaft of the feeding device is

  placed just below the path described by the press piston during

during its course.

  When the feed device is of the rotary type, the driven shaft of the feed device can be arranged substantially centrally

  in the available space, delimited by the upper side of the core channel-

  neur, the lower side of the press piston displacement tunnel and forwards by an imaginary straight line connecting the main transmission and the pickup device located below. The casing of the spur gear transmission can be easily and inexpensively attached to the

  chassis structure of the big bale press by interlocking, by screw-

  wise or by any other means known from the state of the art.

  To interrupt the drive of the supply device, for example in the event of an overload, it is proposed to associate the transmission with

  spur gears a safety clutch actuated either automatically

  either manually by the user who interrupts the connection

  drive with the feeding device. In addition, a hydraulic pump

  that can be linked to the transmission with spur gears in a simple and inexpensive way, the pump being able to be driven by an additional stage of pinions or the drive of the pump being integral in rotation with a shaft end of the one of the spur gears. The elements of the big bale press which from the drive point of view are placed upstream

  of the supply device can be stopped using

  electric, hydraulic or mechanical control in order to allow, in the event of an overload cut, of the feed device, to clear the feeder channel before the pick up device and the cutting device

resume their work.

  You can also use a spur gear transmission to

  fully or partially carry out the training link with a device

  positive cutting or picking up of a big bale press.

  The invention is described below in detail with the aid of exemplary embodiments. The drawings represent: FIG. 1, a large baler in side view,

  figure2a schematic representation of a trans-

  mission. FIG. I shows a large bale press 2 which has a pressing chamber 4 with a piston inside it

  press 6 which moves back and forth. A disposi-

  pickup 8 (or pick-up) is located below the main transmission, which pickup device picks up the product on the spot

  to harvest and brings it using conveyor screws 10 transverse to the center

  tre of the cutting device 12. From there, the product to be harvested is conveyed in

  the feeder channel 14 where it is collected and then ejected by the feeder

  born 16, as a load portion, in the pressing chamber 4 during-

  that the piston 6 discovers the inlet opening of the pressing chamber 4, during its cyclic displacement. The portion of charge introduced into the chamber 4 is pressed by the stroke of the press piston 6 against the product compressed in the bear of the previous cycles, is densified and discharged with the product already densified in the direction of the outlet of 18 from the pressing chamber 4. Following a trigger signal, the tying needle 20

  brings the tying twine through a pivoting movement until it is available

  binding sitive 22, where said string is cut and knotted. The finished ball and

  linked can then slide on the field through exit 18.

  Whether or not there is a tying device 12, whether the feeding device 16 operates in the manner described or in a different manner known from the prior art, for example as a rotary feeder, which '' there are several feeding devices or that the feeding device performs one or more strokes during a piston pressing stroke

  6 doesn't matter. What is important is that the functioning of these organizations

  nes is linked to a transmission system. The working members of the large baler are driven by means of an articulated shaft 26 connected to a power take-off 24 of an agricultural tractor not shown, which articulated shaft is linked to an intermediate flywheel 28 in the main transmission 30. In the main transmission 30, the driving force is distributed to the motor shaft 42 on which the crank arms 44 are mounted fixed in rotation, which crank arms transmit

  the driving force to the press piston 6 by means of connecting rods 46

  plies, and to the motor shaft 48 which is disposed outside the circle of rotation of the crank arms 44. While the tying device 22 is driven by the drive shaft 42 by means of pinions and l articulated shaft 50, the pickup device 8 and the cutting device 12 are

  driven by a common transmission 52 and an articulated shaft 54 com-

  provided from the output shaft 48. The feeding device 16 is driven by a group of mutually engaged straight pinions 56 which is arranged on the side of the large baler 2, the first pinion 56 being linked in

  drive by a shaft not shown and a set of pinions on the shaft 48.

  The angle between the imaginary line connecting the drive shaft 42 and the shaft 48 and the line connecting the shaft 48 to the shaft of the last pinion 56 "" is 120

  approximately in the exemplary embodiment.

  The principle of transmission is shown diagrammatically

  tick in FIG. 2. The driving force introduced by the input shaft 58 into the main transmission 30 is at least partially transmitted to the shaft 48 which supplies the driving force for the feeding device 16. There exists between l driven shaft 92 which sets in motion the feeding device 16 and the driving shaft 48 a distance A which must be "bridged" from the point of

  view of training. This distance is bridged using a transmission-

  spur gear, of which the casing 94 contains several spur gears 56 'to 56 "" mutually engaged. The number of pinions 56 of the transmission can be greater or less depending on the diameter of the pinions and the distance to be bridged. The specific casing 94 can be deleted

  as soon as sufficient protection can be obtained by other means

  fisante against dirt and sufficient lubrication to avoid significant wear of the pinions. The driving force is transmitted

  by the pinion 86 integral in rotation with the shaft 48 with the driven shaft 92 of the device

  positive feed 16, via pinions 56 'to 56 "". One can naturally use according to the needs and the circumstances a more or less large number of pinions of the same diameter or of different diameter

  for the implementation of the invention.

  In the transmission of the driving force from the pinion 56 'to the pinion 56 ", the peculiarity is that the shaft 96 which is integral with the pinion 56" carries the pinion 98 which meshes with the pinion 56'. The pinion 98 transmits the driving force in the casing 100 in which is mounted a safety clutch known per se. As long as no tripping condition is present, the safety clutch transmits the driving force to the shaft 96, which shaft in turn transmits the driving force to the driven shaft 92 via the pinions 56 "to 56 "". On the other hand, in the event of tripping conditions, the safety clutch interrupts the transmission between the

  pinion 98 and the shaft 96 so that the drive of the shaft 92 is inter-

  broken. An interruption of this type is advantageous when there is a risk

  of overloading the supply device or when the drive of the device

  feed 16 should be discontinued for other reasons. Naturally

  other safety clutches can be provided, or even clutches

  Safety ges can be provided at other locations in the transmission chain, in particular on or in the casing 94 of the transmission to

spur gears.

  We can see the screws 102 by means of which the transmission housing

  spur gear 94 is fixed to the chassis structure of the baler. Trees 48 and 92 can be divided for this in the plane of the

  screw 102 by means of interlocking connections 103.

  The present description of the invention is given only to

  as an example. Naturally, variants of the embodiment are possible, without departing from the scope of the invention. Thus the transmission with spur gears can be used to ensure the transmission in places where the space is very reduced and the remaining distance from a driven shaft 92 can be bridged by other drive means, such as for example a transmission chain or articulated shaft transmission. Similarly, the position and the drive of the motor shaft 48 can be modified by a different design of the transmission.

main 30.

Claims (9)

  1. Transmission system for a large baler   carrying a pressing chamber arranged in the longitudinal direction and open towards the rear, a press piston movable in a reciprocating movement inside said pressing chamber, devices for picking up the product to be harvested from the field, a feeder channel for storing a load of product to be harvested and transporting it in the pressing chamber using an additional feeding device, a tying device for binding the finished bales as well as a transmission system for driving all the functional elements, characterized in that the connection between the motor shaft (48) which supplies the driving force for driving the supply device (16) is at least partially achieved by a transmission with spur gears or by several pinions mutually engaging rights.   2. Transmission system according to claim 1, characterized   by the fact that the motor shaft (48) is arranged outside the circle of rotation tion of the crank arms (44).   3. Transmission system according to claim 1 or 2, charac-   terrified by the fact that the angle between an imaginary straight line connecting the motor shaft (48) and the motor shaft (42) of the crank arms (44) and the right   imaginary connecting the motor shaft (48) and the driven shaft of the driving device   née (16), when viewed from the side, is more than about 90.   4. Transmission system according to any one of the claims.   cations 1 to 3, characterized in that a driven shaft (92) of the supply device (16) is arranged just below the path of the piston   press (6) during a work cycle.   5. Transmission system according to any one of the claims.   cations 1 to 4, characterized in that the casing (94) of the transmission to   spur gears is fixed to the chassis structure of the coarse press (2)   its balls by interlocking, by screwing or by other means.   6. Transmission system according to any one of the claims.   cations 1 to 5, characterized in that a safety clutch (100) is   associated with the spur gear transmission (56 '- 56 "").   7. Transmission system according to any one of the claims.   cations 1 to 6, characterized in that a hydraulic pump is linked in   spur gear drive.   8. Transmission system according to any one of the claims.   cations i to 7, characterized in that the drive elements of the large baler which, from the drive point of view, are arranged upstream of the feed device can be put out of service by actuated or triggered means electrically, hydraulically or mechanical or manually.   9. Transmission system according to any one of the claims.   cations i to 8, characterized in that it is provided in addition to or in place of   the right gear transmission (56 '- 56 "") a gear transmission   straight strokes to completely or partially create a drive connection between a drive shaft and a pickup device and / or a cutting device.