FR2645481A1 - Hydraulic braking device for agricultural trailers - Google Patents

Hydraulic braking device for agricultural trailers Download PDF

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Publication number
FR2645481A1
FR2645481A1 FR8904662A FR8904662A FR2645481A1 FR 2645481 A1 FR2645481 A1 FR 2645481A1 FR 8904662 A FR8904662 A FR 8904662A FR 8904662 A FR8904662 A FR 8904662A FR 2645481 A1 FR2645481 A1 FR 2645481A1
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France
Prior art keywords
spring
accumulator
braking
circuit
hydraulic
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Granted
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FR8904662A
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French (fr)
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FR2645481B1 (en
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DEHAUMONT PATRICK
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DEHAUMONT PATRICK
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Priority to FR8904662A priority Critical patent/FR2645481B1/en
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Publication of FR2645481B1 publication Critical patent/FR2645481B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/22—Brakes applied by springs or weights and released hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/20—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger specially for trailers, e.g. in case of uncoupling of or overrunning by trailer

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Braking Arrangements (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

The invention relates to a hydraulic braking device allowing mechanical braking in the event of the hitch breaking, for parking, or in the event of failure in the braking circuit of the tractor. It consists of a hydraulic circuit 1 connected to two circuits 17 and 14 which each supply one of the chambers of the brake cylinders (expanders) 8, 9, 10 and 11. The control levers for the brakes 13 are kept braked in the rest position by springs 12. An accumulator 5, mounted on the line 17, makes it possible, under normal operation, to balance the force of the springs, and thus unclamp the brakes. A non-return valve 3, held by a spring 4, determines the pumped-up pressure of the accumulator 5. A valve (tap) 16 makes it possible to discharge the accumulator 5 and thus to release the action of the springs 12. This device applies particularly to agricultural trailers with several braked axles.

Description

DESCRIPTION
La présente invention concerne un dispositif de freinage hydraulique de remorque agricole à plusieurs essieux permettant un freinage mécanique des essieux en cas de rupture d'attelage, de parcage et de défaillance du circuit hydraulique du tracteur.DESCRIPTION
The present invention relates to a hydraulic braking device for an agricultural trailer with several axles allowing mechanical braking of the axles in the event of coupling breakage, parking and failure of the tractor's hydraulic circuit.

Les dispositifs de freinage hydraulique des remorques agricoles connus assurent le freinage en cas de rupture d'attelage et de parcage par la pression hydraulique emmagasinée dans un accumulateur hydropneumatique et restituée sur les vérins de frein par l'ouverture d'une vanne commandée soit par le conducteur, soit par un système automatique (ex : traction sur le flexible de liaison tracteur remorque). The hydraulic braking devices of known agricultural trailers provide braking in the event of a coupling breakage and parking by the hydraulic pressure stored in a hydropneumatic accumulator and restored on the brake cylinders by the opening of a valve controlled either by the driver, either by an automatic system (ex: traction on the tractor trailer connection hose).

D'autres dispositifs agissent par le serrage mécanique des freins, commandés par tringlerie câble, mais ils n'agissent que sur un seul essieu et n'effectuent qu'un serrage relativement faible. Other devices act by the mechanical application of the brakes, controlled by cable linkages, but they act on only one axle and only perform a relatively weak application.

Le dispositif selon l'invention permet d'obtenir un freinage mécanique efficace sur l'ensemble des roues freinées d'une remorque, en cas de rupture d'attelage, de parcage, et n'autorise-pas de déblocage des freins lors d'une défaillance du circuit hydraulique du tracteur. The device according to the invention makes it possible to obtain effective mechanical braking on all of the braked wheels of a trailer, in the event of a coupling break, of parking, and does not allow the brakes to be released during failure of the tractor hydraulic system.

Le dispositif selon l'invention se caractérise par l'action combinée d'un ressort et d'un vérin à double action sur chaque roue freinée, le ressort effectuant au repos le freinage de la roue. The device according to the invention is characterized by the combined action of a spring and a double-acting cylinder on each braked wheel, the spring braking the wheel at rest.

La ligne hydraulique du freinage provenant du tracteur, qui est par construction une ligne flexible, se divise en deux conduites pour alimenter chaque chambre du vérin. The hydraulic braking line from the tractor, which is by construction a flexible line, is divided into two lines to supply each chamber of the cylinder.

Sur la conduite alimentant la chambre du vérin dont le déplacement s'oppose à l'action du ressort, se trouvent un clapet anti-retour, laissant le passage libre vers le vérin, et un accumulateur hydropneumatique situé entre le clapet anti-retour et le vérin. Un robinet d'arrêt permet, par son ouverture, de mettre en communication les deux conduites. On the line supplying the cylinder chamber, the movement of which opposes the action of the spring, there is a non-return valve, allowing free passage to the cylinder, and a hydropneumatic accumulator located between the non-return valve and the cylinder. A stopcock allows, by its opening, to put the two pipes in communication.

La deuxième conduite alimente la chambre du vérin tra vaillant dans le même sens que l'action du ressort, c'est-àdire l'action d'effectuer le freinage. The second pipe feeds the chamber of the cylinder working in the same direction as the action of the spring, that is to say the action of effecting the braking.

Lors de l'attelage de la remorque, une action du freinage du tracteur provoquera d'une part lue gonflage de l'accumulateur, et d'autre part, le maintien du frein serré. When coupling the trailer, an action of the tractor braking will on the one hand cause the accumulator to inflate, and on the other hand, keep the brake applied.

Lors du relâchement de l'action sur le frein du tracteur, le clapet anti-retour se fermera et l'énergie hydraulique emmagasinée dans l'accumulateur viendra compenser l'effort du ressort et ainsi desserrer le frein de la roue. When the action on the tractor brake is released, the non-return valve will close and the hydraulic energy stored in the accumulator will compensate for the spring force and thus release the wheel brake.

Si le circuit hydraulique de freinage du tracteur ne délivre pas sa pression nominale (150 bars), le gonflage de l'accumulateur sera insuffisant pour compenser l'effort du ressort, la roue restera donc freinée. Le déplacement de la remorque n'est donc possible que si le circuit de freinage du tracteur fonctionne normalement. If the tractor's hydraulic braking circuit does not deliver its nominal pressure (150 bar), the inflation of the accumulator will be insufficient to compensate for the spring force, the wheel will therefore remain braked. Trailer movement is therefore only possible if the tractor brake system is operating normally.

En fonctionnement normal, les forces exercées par le ressort et la pression emmagasinée par l'accumulateur s'annulant, la pression de freinage modérée par le conducteur permet un freinage normal. In normal operation, the forces exerted by the spring and the pressure stored by the accumulator being canceled, the braking pressure moderated by the driver allows normal braking.

Lors d'une rupture d'attelage, une cordelette reliant le tracteur au robinet d'arrêt ouvrira le robinet, provoquant ainsi la décharge de l'accumulateur dans l'ensemble du circuit, ou sur la route si le flexible de liaison remorque-tracteur a été arraché lors de la rupture, permettant ainsi aux ressorts de freiner les roues. In the event of a coupling breakage, a cord connecting the tractor to the stop valve will open the valve, thus causing the discharge of the accumulator throughout the circuit, or on the road if the trailer-tractor connection hose was torn off when it broke, allowing the springs to brake the wheels.

Lors du parcage de la remorque, l'ouverture du robinet permettra la décharge de l'accumulateur, dans le tracteur, libérant ainsi l'action des ressorts. When parking the trailer, opening the tap will allow the accumulator to discharge in the tractor, thereby releasing the action of the springs.

Selon une variante, le vérin peut se trouver directement dans le tambour et agir sur les mâchoires, permettant ainsi de réduire l'encombrement de l'ensemble du système. Alternatively, the cylinder can be located directly in the drum and act on the jaws, thereby reducing the size of the entire system.

La figure 1 représente le dispositif selon l'invention. Figure 1 shows the device according to the invention.

La figure 2 représente une variante de ce dispositif. Figure 2 shows a variant of this device.

Le dispositif représenté sur la figure 1 se compose d'un flexible (1) de liaison du tracteur à la remorque qui se divise en (2) en deux circuits distincts. The device shown in Figure 1 consists of a hose (1) connecting the tractor to the trailer which is divided into (2) in two separate circuits.

Le clapet anti-retour (3) permet le passage vers l'accumulateur hydropneumatique (5) lorsque la pression at teint la valeur du ressort (4), puis la ligne (17) se dirige vers les chambres (7) des vérins 8, 9, 10 et 11 par l'intermédiaire d'un conduit effectué dans la tige (6) des vérins. The non-return valve (3) allows passage to the hydropneumatic accumulator (5) when the pressure has reached the value of the spring (4), then the line (17) goes towards the chambers (7) of the jacks 8, 9, 10 and 11 via a conduit made in the rod (6) of the jacks.

Un ressort (12), identique sur tous les vérins, maintient les leviers de commande des freins en position serrés au repos.A spring (12), identical on all the cylinders, keeps the brake control levers in the tight position at rest.

La deuxième ligne (14) alimente la chambre (15) des vérins. Le robinet d'arrêt (16) permet de mettre en communication les lignes (17) et (14) pour la décharge de l'accumulateur (5). Cette ouverture du robinet (16) peut être commandée depuis le tracteur par la cordelette (18). The second line (14) supplies the chamber (15) of the jacks. The stop valve (16) makes it possible to put the lines (17) and (14) in communication for discharging the accumulator (5). This opening of the tap (16) can be controlled from the tractor by the cord (18).

Suivant une forme de réalisation préférentielle, les vérins 8, 9, 10 et 11 ont un diamètre de la chambre (15) de 25 mm, et un diamètre de la tige de la chambre (7) de 14 mm. According to a preferred embodiment, the cylinders 8, 9, 10 and 11 have a diameter of the chamber (15) of 25 mm, and a diameter of the rod of the chamber (7) of 14 mm.

Ces vérins ont une course de 50 mm. Les ressorts (12), montés autour des vérins, travaillent en compression, d'un diamètre du fil de 8 mm, exercent une force de 375 kg par vérin lorsque les vérins sont en position rentrés ou freins desserrés, et 225 kg lorsque les vérins sont complètement sortis ou freins serrés.These cylinders have a stroke of 50 mm. The springs (12), mounted around the cylinders, work in compression, with a wire diameter of 8 mm, exert a force of 375 kg per cylinder when the cylinders are in the retracted or released brakes position, and 225 kg when the cylinders are fully extended or the brakes are applied.

Cette force de ressort est équilibrée par une pression de 117 bars produite par l'accumulateur dont le volume est fonction du nombre de vérins. This spring force is balanced by a pressure of 117 bars produced by the accumulator, the volume of which depends on the number of cylinders.

Suivant une variante de l'invention, le vérin (19) se trouve à l'intérieur du tambour et actionne directement les mâchoires. Les chambres (20) et (21) sont connectées à la ligne (17) et à l'accumulateur (5). Les rondelles ressort (22) tendent à maintenir le vérin sorti et à appliquer les mâchoires sur le tambour. According to a variant of the invention, the jack (19) is located inside the drum and directly actuates the jaws. The chambers (20) and (21) are connected to the line (17) and to the accumulator (5). The spring washers (22) tend to keep the cylinder extended and to apply the jaws to the drum.

Le dispositif selon l'invention est particulierement destiné au freinage des remorques agricoles comportant plusieurs essieux équipés de frein.  The device according to the invention is particularly intended for braking agricultural trailers comprising several axles fitted with brakes.

Claims (6)

REVENDICATIONS 1) Dispositif de freinage hydraulique pour remorque agricole a plusieurs essieux freinés, caractérisé par l'action combinée d'un ressort (12) avec un vérin (8, 9, 10 ou 11) par roue freinée, et par l'alimentation hydraulique des vérins en deux circuits (14) et (17) dont le deuxième est équipé d'un clapet anti-retour (3) et d'un accumulateur hydropneumatique (5). Un robinet (16) permet par son ouverture de mettre en liaison le circuit (14) et le circuit (17). 1) Hydraulic braking device for agricultural trailer with several braked axles, characterized by the combined action of a spring (12) with a jack (8, 9, 10 or 11) by braked wheel, and by the hydraulic supply of cylinders in two circuits (14) and (17), the second of which is fitted with a non-return valve (3) and a hydropneumatic accumulator (5). A tap (16) allows, by its opening, to connect the circuit (14) and the circuit (17). 2) Dispositif selon la revendication 1 caractérisé en ce que chaque frein est maintenu serré, en position repos, en cas de rupture d'attelage ou de défaillance du circuit hydraulique tracteur ou remorque par un ressort (12). 2) Device according to claim 1 characterized in that each brake is kept applied, in the rest position, in the event of a coupling breakage or failure of the tractor or trailer hydraulic circuit by a spring (12). 3) Dispositif selon la revendication 1 caractérisé par un vérin (8, 9, 10 ou 11) à double effet sur chaque roue freinée. 3) Device according to claim 1 characterized by a jack (8, 9, 10 or 11) with double effect on each braked wheel. 4) Dispositif selon les revendications 1 et 2 caractérise en ce qu'un accumulateur hydropneumatique (5) permet un fonctionnement normal, après son remplissage au travers du clapet (3), d'annuler lteffet du ressort (12) et de desserrer le frein pour permettre un freinage modérable. 4) Device according to claims 1 and 2 characterized in that a hydropneumatic accumulator (5) allows normal operation, after filling through the valve (3), cancel the effect of the spring (12) and release the brake to allow moderate braking. 5) Dispositif selon la revendication 1 caractérisé par le robinet (16) permettant par son ouverture de libérer l'action du ressort (12) par la décharge de l'accumulateur hydropneumatique (5) dans les deux circuits (14) et (17), ou sur la route en cas de rupture du circuit. 5) Device according to claim 1 characterized by the valve (16) allowing by its opening to release the action of the spring (12) by the discharge of the hydropneumatic accumulator (5) in the two circuits (14) and (17) , or on the road if the circuit breaks. 6) Dispositif selon les revendications 1, 2, 3, 4 et 5 caractérisé en ce que le volume restreint des vérins (8, 9, 10 et 11) et de leur ressort (12) permet de les inclure dans les tambours.  6) Device according to claims 1, 2, 3, 4 and 5 characterized in that the restricted volume of the jacks (8, 9, 10 and 11) and their spring (12) allows them to be included in the drums.
FR8904662A 1989-04-10 1989-04-10 HYDRAULIC BRAKING DEVICE FOR AGRICULTURAL TRAILERS Expired - Fee Related FR2645481B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8904662A FR2645481B1 (en) 1989-04-10 1989-04-10 HYDRAULIC BRAKING DEVICE FOR AGRICULTURAL TRAILERS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8904662A FR2645481B1 (en) 1989-04-10 1989-04-10 HYDRAULIC BRAKING DEVICE FOR AGRICULTURAL TRAILERS

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FR2645481A1 true FR2645481A1 (en) 1990-10-12
FR2645481B1 FR2645481B1 (en) 1994-12-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698930A1 (en) * 1992-12-04 1994-06-10 Gregoire Besson Ets Hydraulically operated brake control for tractor or tracked vehicles - includes two concentrically disposed jacks whose bodies define variable volume pressure chamber between them, with body of internal jack forming piston of external jack
FR2704611A1 (en) * 1993-04-30 1994-11-04 Mermillod Grossemain Serge Emergency brake for snow scooter
GB2556357A (en) * 2017-06-22 2018-05-30 European Forest Machinery Ltd Apparatus and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128451A1 (en) * 1971-03-01 1972-10-20 Teagle William
FR2384661A1 (en) * 1977-03-21 1978-10-20 Sab Industri Ab HYDRAULIC BRAKING CIRCUIT OF A VEHICLE
EP0018227A1 (en) * 1979-04-19 1980-10-29 Wabco Automotive U.K. Limited Tractor/trailer braking systems with spring brake emergency braking and parking

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128451A1 (en) * 1971-03-01 1972-10-20 Teagle William
FR2384661A1 (en) * 1977-03-21 1978-10-20 Sab Industri Ab HYDRAULIC BRAKING CIRCUIT OF A VEHICLE
EP0018227A1 (en) * 1979-04-19 1980-10-29 Wabco Automotive U.K. Limited Tractor/trailer braking systems with spring brake emergency braking and parking

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698930A1 (en) * 1992-12-04 1994-06-10 Gregoire Besson Ets Hydraulically operated brake control for tractor or tracked vehicles - includes two concentrically disposed jacks whose bodies define variable volume pressure chamber between them, with body of internal jack forming piston of external jack
FR2704611A1 (en) * 1993-04-30 1994-11-04 Mermillod Grossemain Serge Emergency brake for snow scooter
GB2556357A (en) * 2017-06-22 2018-05-30 European Forest Machinery Ltd Apparatus and method
GB2556357B (en) * 2017-06-22 2018-11-28 European Forest Machinery Ltd Brake Actuator for a Trailer

Also Published As

Publication number Publication date
FR2645481B1 (en) 1994-12-09

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