GB2289508A - A trailer braking system - Google Patents

A trailer braking system Download PDF

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Publication number
GB2289508A
GB2289508A GB9510146A GB9510146A GB2289508A GB 2289508 A GB2289508 A GB 2289508A GB 9510146 A GB9510146 A GB 9510146A GB 9510146 A GB9510146 A GB 9510146A GB 2289508 A GB2289508 A GB 2289508A
Authority
GB
United Kingdom
Prior art keywords
trailer
deceleration
brake system
towing vehicle
hydraulic fluid
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Withdrawn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
GB9510146A
Other versions
GB9510146D0 (en
Inventor
Seamus Golden
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB9510146D0 publication Critical patent/GB9510146D0/en
Publication of GB2289508A publication Critical patent/GB2289508A/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B60T7/203—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 with automatic brake release or reduction in case of reverse travel, e.g. by means of mechanisms mounted on the draw bar
    • 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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/107—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic overrun brakes with fluid means

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

When deceleration of a vehicle towing a trailer is detected, the trailer brakes are operated hydraulically. As illustrated, the deceleration is detected by relative movement between a piston 13 and a cylinder 14 connected between a tow hitch 12 and the trailer chassis. When the towing vehicle and trailer are reversing, the trailer brakes are disabled by a flap being deployed to prevent rearward movement of the piston relative to the cylinder. In a second embodiment deceleration of the towing vehicle is signalled electrically to the trailer with the signal powering a hydraulic actuator. <IMAGE>

Description

Trailer Brake Svstem The present invention relates to a trailer brake system.
According to the present invention there is provided a trailer brake system comprising means for detecting the deceleration of a vehicle towing the trailer, said detecting means triggering actuating means for applying braking force to the trailer.
Preferably, the trailer travels on wheels which include hydraulically powered hub brakes and braking force is applied to the hub brakes.
Preferably, said actuating means includes an hydraulic fluid supply communicating with said hub brakes, said hydraulic fluid being displaced upon deceleration of the trailer to cause the hub brakes to be applied.
Preferably, the trailer comprises a first part connected to the towing vehicle and a second part movably connected to said first part and deceleration of the towing vehicle is detected through movement of the second part with respect to the first part causing displacement of the hydraulic fluid and braking force to be applied to the trailer.
Alternatively, deceleration of the towing vehicle is signalled electrically to the trailer, said signal powering the actuating means.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a first embodiment of a trailer brake system according to the invention; and Figure 2 is a perspective view of a second embodiment of the trailer brake system according to the invention.
Referring now to the drawings wherein similar numerals have been used to indicate like parts, there is shown a trailer brake system generally indicated at 10 according to the invention. A first embodiment of the brake system 10 comprises an hydraulic ram 11 fitted to the rear of a hitch 12 of a trailer. The hitch 12 is fitted to the rear of a vehicle (not shown) which tows the trailer. The ram 11 comprises a piston 13 which is slidably inserted into one end 15 of a sleeve 14. The end 16 of the piston 13 remote from the sleeve 14 is connected to the hitch 12, while the end 17 of the sleeve 14 remote from the piston 13 extends to form the remainder of the chassis (not shown) of the trailer.
When the trailer is being towed by a vehicle, the ram 11 tends to extend with the piston 13 being withdrawn from the sleeve 14, thus increasing the internal volume of the sleeve. When the vehicle towing the trailer decelerates, the sleeve 14 tends to move over the piston 13 and reduce the internal volume of the sleeve.
The sleeve 14 is filled with hydraulic fluid 18, which is supplied through a removable cap 19. A tube 20 communicates with the hydraulic fluid 18 stored in the sleeve 14. Changes in the internal volume of the sleeve 14 cause a corresponding displacement of the hydraulic fluid 18 within the tube 20.
The tube 20 splits into two further tubes 21, each of which is connected to respective hubs 23 of the trailer wheels 22. Compression of the ram 11 when the towing vehicle brakes thus causes the hydraulic fluid 18 to flow into the hubs 23 where it causes brake pads (not shown) to bear against the inside surface of the hub and thus apply braking force to the trailer.
A disadvantage of the first embodiment is that when the towing vehicle reverses, the ram 11 is compressed causing the trailer brakes to be applied unnecessarily.
To obviate this problem, a flap (not shown) capable of being deployed between the piston 13 and the sleeve 14 must be provided. Thus, when the flap is deployed and the towing vehicle subsequently reverses, the piston 13 bears against the flap and does not displace the hydraulic fluid 18 from the sleeve 14 and cause the brakes to be applied.
In a second embodiment of the invention, Figure 2, the brake system 100 includes a piston 13 and a sleeve 14 which are fixed relative to one another. A pair of electrical leads 24 are connected to the brake signal of the towing vehicle. When the brakes are applied in the towing vehicle, power is supplied through the leads 24.
The leads 24 drive an actuator (not shown) located within the sleeve 14 which, when power is supplied, causes the hydraulic fluid 18 to be displaced from the sleeve 14 as before. This obviates the need for a flap to be deployed when the towing vehicle is to be reversed.
It will be seen that, where an electrical reverse signal is available, it is possible for the leads 24 to be employed in the first embodiment to deploy the flap automatically when the towing vehicle begins to reverse.
The invention is not limited to the embodiments described herein which may be modified or varied without departing from the scope of the invention.

Claims (5)

CLAIMS:
1. A trailer brake system comprising means for detecting the deceleration of a vehicle towing the trailer, said detecting means triggering actuating means for applying braking force to the trailer.
2. A trailer brake system as claimed in Claim 1 wherein the trailer travels on wheels which include hydraulically powered hub brakes and braking force is applied to the hub brakes.
3. A trailer brake system as claimed in Claim 2 wherein said actuating means includes an hydraulic fluid supply communicating with said hub brakes, said hydraulic fluid being displaced upon deceleration of the trailer to cause the hub brakes to be applied.
4. A trailer brake system as claimed in Claim 3 wherein the trailer comprises a first part connected to the towing vehicle and a second part movably connected to said first part and deceleration of the towing vehicle is detected through movement of the second part with respect to the first part causing displacement of the hydraulic fluid and braking force to be applied to the trailer.
5. A trailer brake system as claimed in Claim 1, 2 or 3 wherein deceleration of the towing vehicle is signalled electrically to the trailer, said signal powering the actuating means.
GB9510146A 1994-05-20 1995-05-19 A trailer braking system Withdrawn GB2289508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IES940415 IES940415A2 (en) 1994-05-20 1994-05-20 Trailer brake system

Publications (2)

Publication Number Publication Date
GB9510146D0 GB9510146D0 (en) 1995-07-12
GB2289508A true GB2289508A (en) 1995-11-22

Family

ID=11040408

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9510146A Withdrawn GB2289508A (en) 1994-05-20 1995-05-19 A trailer braking system

Country Status (2)

Country Link
GB (1) GB2289508A (en)
IE (1) IES940415A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29613898U1 (en) * 1996-08-10 1997-01-16 Bender Bernhard Dr Med Bicycle trailer with hydraulic overrun brake
WO2000053479A1 (en) 1999-03-11 2000-09-14 Olivier Nachbagauer Brake for towed vehicles
WO2003035442A1 (en) * 2001-10-04 2003-05-01 Mattias Liljeberg An arrangement and a method for activating and deactivating the braking system of a trailer
CN103359089A (en) * 2013-07-29 2013-10-23 中国重汽集团泰安五岳专用汽车有限公司 Braking device applied to full trailer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1352869A (en) * 1970-05-19 1974-05-15 Beka St Aubin Sa Tractor-trailer brake system
GB1364539A (en) * 1970-11-27 1974-08-21 Koper Manpar Ag Overrunning brake installations for trailers
GB1432956A (en) * 1973-02-24 1976-04-22 Rubery Owen & Co Ltd Trailers
GB1454628A (en) * 1973-10-23 1976-11-03 Bendix Corp Surge brake actuator
GB2021504A (en) * 1978-05-30 1979-12-05 Atwood Vacuum Machine Co Trailer hitch and brake actuating assembly
GB2267134A (en) * 1992-05-22 1993-11-24 Paul Goy Trailer vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1352869A (en) * 1970-05-19 1974-05-15 Beka St Aubin Sa Tractor-trailer brake system
GB1364539A (en) * 1970-11-27 1974-08-21 Koper Manpar Ag Overrunning brake installations for trailers
GB1432956A (en) * 1973-02-24 1976-04-22 Rubery Owen & Co Ltd Trailers
GB1454628A (en) * 1973-10-23 1976-11-03 Bendix Corp Surge brake actuator
GB2021504A (en) * 1978-05-30 1979-12-05 Atwood Vacuum Machine Co Trailer hitch and brake actuating assembly
GB2267134A (en) * 1992-05-22 1993-11-24 Paul Goy Trailer vehicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29613898U1 (en) * 1996-08-10 1997-01-16 Bender Bernhard Dr Med Bicycle trailer with hydraulic overrun brake
WO2000053479A1 (en) 1999-03-11 2000-09-14 Olivier Nachbagauer Brake for towed vehicles
WO2003035442A1 (en) * 2001-10-04 2003-05-01 Mattias Liljeberg An arrangement and a method for activating and deactivating the braking system of a trailer
CN103359089A (en) * 2013-07-29 2013-10-23 中国重汽集团泰安五岳专用汽车有限公司 Braking device applied to full trailer
CN103359089B (en) * 2013-07-29 2015-07-08 中国重汽集团泰安五岳专用汽车有限公司 Braking device applied to full trailer

Also Published As

Publication number Publication date
IES66706B2 (en) 1996-01-24
GB9510146D0 (en) 1995-07-12
IES940415A2 (en) 1996-01-24

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)