IES940415A2 - Trailer brake system - Google Patents
Trailer brake systemInfo
- Publication number
- IES940415A2 IES940415A2 IES940415A IES940415A2 IE S940415 A2 IES940415 A2 IE S940415A2 IE S940415 A IES940415 A IE S940415A IE S940415 A2 IES940415 A2 IE S940415A2
- Authority
- IE
- Ireland
- Prior art keywords
- trailer
- brake system
- deceleration
- towing vehicle
- hydraulic fluid
- Prior art date
Links
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
A trailer brake system conprises means for detecting the deceleration of a vehicle towing the trailer. The detecting means triggers actuating means for applying braking force to the trailer. In a first embodiment the trailer comprises a first part connected to the towing vehicle and a second part movably connected to the first part and deceleration of the towing vehicle is detected through movement of the second part with respect to the first part. In a second embodiment deceleration of the towing vehicle is signalled electrically to the trailer with the signal powering the actuating means. <FIG. 1>.
Description
Trailer Brake System
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.
OPEN TO PUP' ' ^PECTION
SECTION and RULE 23
JNL No /77S
4 0 4 1 5 ’’
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 tf 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)
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.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IES940415 IES940415A2 (en) | 1994-05-20 | 1994-05-20 | Trailer brake system |
GB9510146A GB2289508A (en) | 1994-05-20 | 1995-05-19 | A trailer braking system |
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 |
---|---|
IES66706B2 IES66706B2 (en) | 1996-01-24 |
IES940415A2 true IES940415A2 (en) | 1996-01-24 |
Family
ID=11040408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IES940415 IES940415A2 (en) | 1994-05-20 | 1994-05-20 | Trailer brake system |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2289508A (en) |
IE (1) | IES940415A2 (en) |
Families Citing this family (4)
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 |
EP1077854A1 (en) | 1999-03-11 | 2001-02-28 | Olivier Nachbagauer | Brake for towed vehicles |
SE523069C2 (en) * | 2001-10-04 | 2004-03-23 | Mattias Liljeberg | Device for activating and deactivating the braking system for a 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 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3779612A (en) * | 1970-05-19 | 1973-12-18 | Beka St Aubin Sa | Trailer brake control 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 |
US3880263A (en) * | 1973-10-23 | 1975-04-29 | Bendix Corp | Surge brake actuator |
US4223766A (en) * | 1978-05-30 | 1980-09-23 | Atwood Vacuum Machine Company | Trailer hitch and brake actuating assembly |
GB2267134B (en) * | 1992-05-22 | 1995-10-25 | Paul Goy | Trailer vehicle |
-
1994
- 1994-05-20 IE IES940415 patent/IES940415A2/en not_active IP Right Cessation
-
1995
- 1995-05-19 GB GB9510146A patent/GB2289508A/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
GB2289508A (en) | 1995-11-22 |
IES66706B2 (en) | 1996-01-24 |
GB9510146D0 (en) | 1995-07-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Patent lapsed |