GB2278900A - Hydraulic trailer brake - Google Patents

Hydraulic trailer brake Download PDF

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Publication number
GB2278900A
GB2278900A GB9311695A GB9311695A GB2278900A GB 2278900 A GB2278900 A GB 2278900A GB 9311695 A GB9311695 A GB 9311695A GB 9311695 A GB9311695 A GB 9311695A GB 2278900 A GB2278900 A GB 2278900A
Authority
GB
United Kingdom
Prior art keywords
brake
trailer
hydraulic
pad
disc
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.)
Granted
Application number
GB9311695A
Other versions
GB2278900B (en
GB9311695D0 (en
Inventor
Gordon Holmes
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
Priority to GB9311695A priority Critical patent/GB2278900B/en
Publication of GB9311695D0 publication Critical patent/GB9311695D0/en
Publication of GB2278900A publication Critical patent/GB2278900A/en
Application granted granted Critical
Publication of GB2278900B publication Critical patent/GB2278900B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/08—Self-amplifying or de-amplifying mechanisms
    • F16D2127/10—Self-amplifying or de-amplifying mechanisms having wedging elements

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)

Abstract

Upon trailer (or caravan) over-run, relative movement of the two parts 25, 26 of a hydraulically damped coupling will pivot arm 28 and operate the master-cylinder of the trailer's hydraulic brake circuit and force brake pads 13, 14 into engagement with the brake disc 18 with wedges 15, 16 creating a servo-effect. When the trailer is being reversed,the wedges 15, 16 will permit a reduction in the braking force between the pads and the disc, even if a maximum pressure is being delivered by the master-cylinder. A rod or cable (30, Figure 4) operated parking brake is actuated by lever 24 or by a brakeaway cable (29). <IMAGE>

Description

DESCRIPTTON HYDRAULIC TRAILER BRAZE The present invention is an overrun inertia-type Auto Reverse Hydraulic Brake for towed vehicles, i.e. trailers and caravans.
Fundamental considerations of road safety require that, when a road going 'vehicle such as a trailer is towed behind another vehicle, the towed trailer should itself have a braking system; otherside there is a danger of the towed vehicle overrunninN the towing vehicle when brakes are applied on the latter, thereby resulting in serious loss of control and possible jack-knifing.
While such combinations of towing and towed vehicles may take various forms, for example, a car towing a trailer or caravan, for simplicity in the following description the towing vehicle will be referred to as 'the prime mover' and the towed vehicle as 'the trailer'.
Disregarding the pneumatic braking system fitted to heavy commercial vehicles and trailers, the present braking system of trailers falls into the simple mechanical cable/rod brakes, wholly independent of the prime braking system. The overrun inertia-type brake which reacts t forward pressure of the trailer upon the prime mover to operate them, due to the fact that the inertia-type brake at present operates cableirod or a combination of both, braking efficiency is not as effective as would be preferred. For this reason an alternative trailer braking system has been developed, in which a hydraulic circuit would replace the cableirod system.
It is believed that no such hydraulic overrun inertia-type auto-reverse braking system is available. It is an object of the present invention to provide such a system.
The hydraulic overrun inertia-type braking system according to the present invention comprises a hydraulically damped overrun coupling, a brake master cylinder which can dispense hydraulic pressure to one or more hydraulic braking circuits of a trailer. A brake-pad configuration so designed as to alleviate friction between brake-pad and brake-disc during a reverse manoeuvre, thereby allowing a reverse manoeuvre to take place without the necessity for the driver to leave the prime mover. As soon as forward motion is resumed the braking system will return to a fully operational state automatically. A hydraulic brake wheel caliper designed so as to accommodate the mechanical parking brake components.
A specific embodiment of this invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1. shows a view in section of the hydraulic brake master cylinder Figure 2. shows a view from the front of te brake master cylinder.
Figure 3. shows an aerial view of the rear section of a hydresulic-,lly damped coupling.
Figure 4. shows a side view of the rear section of a hydraulic damped coupling.
Figure 5. shows a view of the brake-pads, disc and brake caliper.
Figure 6. shows a brake-pad caliper carrier.
Figure 7. shows an aerial view in section of the brake disc, caliper and disc-pad carrier, & disc-pads.
Figure 8 shows a view in section of the disc, disc-pad, disc-pad and caliper carrier.
Referring to the drawings: the brake master cylinder i. would be correctly positioned and secured to the rear section of the hydraulically damped coupling body 26. by, for example, nuts and bolts or similar means. The brake-arm 28. would also be correctly positioned and appropriately secured to the hydraulically damped coupling body 26. so that should the coupling piston 25. move rearwards (for example due to the prime mover's brakes being applied) it would come into contact with brake-arm 28. due to the fulcrum positioning of brake-arm 28.
Rearward movement of coupling piston 25. would cause a forward movement of pushrod 6. This movement in turn would create a hydraulic pressure within the trailer's braking circuit.
The brake caliper 11. would be secured to the brake caliper carrier 17. by nuts and bolts. Provision would be made within the brake caliper carrier 17. so as to allow a pre-set amount of movement or brake caliper 11. This movement would compensate and ensure even pressure being applied to both disc-pads.
Durin a reverse manoeuvre rearward movement of coupling piston 25. will activate brake-arm 26. thereby inducing the brake master cylinder 1. to displace brake fluid within the trailer's braking circuit. This additional brake fluid will activate brake caliper piston 9. in such a way as to apply the trailer's brakes. In order to reduce the braking effect of this action the sliding brake-pad 14. . would move both rearward and outward,that is, away from the disc so as to sit in a reverse mode position within the brake pad and caliper carrier 17. thereby reducing the force that can be applied by the brake-pads to the brake-disc when forward motion is resumed sliding brake-pad 14. will return automatically to its correct position.
The trailer's parking brake is by mechanical means. Parking brake cable 21. would be secured to the parking brake lever 24. in a safe manner. Provision would be made for adjustment to parking brake cable 21.
KEY TO DRAWINGS HYDRAULIC TRAILER BRAKE 1. BRAKE MASTER CYLINDER.
2. BRAKE FLUID.
3. OUTLET CHECK VALVE.
4. PISTON SEAL.
5. PISTON.
6. PUSHROD 7. RESERVOIR FILL CrAP.
8. RUBBER DUST COVER.
9. CALIPER PISTON.
10. GUIDE PIN BOLT.
11. CALIPER.
12. GUIDE PIN BOLT RUBBER BOOT.
13. BRAKE-PAD.
14. SLIDING BRAKE-PAD.
15. BRAKE-PAD SLIDING WEDGE.
16. CALIPER WEDGE.
17. BRAKE-PAD AND CALIPER CARRIER.
18. DISC.
19. BRAKE CIRCUIT.
20. RETAINING SPRING FOR DISC-PAD 14.
21. PARKING BRAKE CABLE.
22. CALIPER AND DISC-PAD CARRIER SECURING BOLTS.
23. DISC BACK PLATE.
-- RKING t ?: 26. COUPLING BODY.
27. INSPECTION COVER MASTER CYLINDER.
29. BRAKE ARM.
29. BRAKEAWAY CABLE.
30. PARKING BRAKE-ROD/CABLE.

Claims (1)

  1. CLAIM HYDRAULIC TRAILER BRAKE The present invention is a Hydraulic Trailer Brake, designed for trailers which are permitted to use an overrun inertia-type auto-reverse braking system.
    The hydraulic brake master cylinder would be capable of building up hydraulic pressure and relaying the said pressure to one or more of the trailer's braking circuits.
    The hydraulic brake caliper piston would be capable of moving the brake-pad beyond the minimum requirements.
    The brake-pad configuration would enable the trailer to be reversed without permitting a force beyond the permitted levels to be applied to the brake-disc.
    The brake-pad design would, after a reverse manoeuvre, enable the brake-pads to return automatically to their position for forward motion.
    The brake-pad design would enable trailer travelling in a forward direction to exceed the minimum requirements with reward to braking efficiency.
    The caliper and brake-pad design would accommodate the necessary components required for a mechanical parkins brake.
GB9311695A 1993-06-07 1993-06-07 Over-run, auto-reverse hydraulic braking system on a trailer Expired - Lifetime GB2278900B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9311695A GB2278900B (en) 1993-06-07 1993-06-07 Over-run, auto-reverse hydraulic braking system on a trailer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9311695A GB2278900B (en) 1993-06-07 1993-06-07 Over-run, auto-reverse hydraulic braking system on a trailer

Publications (3)

Publication Number Publication Date
GB9311695D0 GB9311695D0 (en) 1993-07-21
GB2278900A true GB2278900A (en) 1994-12-14
GB2278900B GB2278900B (en) 1996-11-20

Family

ID=10736749

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9311695A Expired - Lifetime GB2278900B (en) 1993-06-07 1993-06-07 Over-run, auto-reverse hydraulic braking system on a trailer

Country Status (1)

Country Link
GB (1) GB2278900B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326449A (en) * 1997-04-05 1998-12-23 Peter Frederick Willmer Over-run trailer brakes
EP0952059A1 (en) * 1996-12-13 1999-10-27 Gordon Holmes Park brake mechanism for trailer overrun brake
WO2003006287A1 (en) * 2001-07-13 2003-01-23 Gordon Holmes Over-run auto-reverse hydraulic braking system on a trailer
WO2009056485A1 (en) * 2007-10-29 2009-05-07 Robert Bosch Gmbh Self-reinforcing disc brake

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB837144A (en) * 1957-10-23 1960-06-09 Howarth Padgett Henry Improvements in or relating to brakes for trailer vehicles
GB1445508A (en) * 1973-08-01 1976-08-11 Dba Sa Trailer disc brake and friction pad therefor
US4153143A (en) * 1978-01-12 1979-05-08 Dico Company, Inc. Trailer brake actuating assembly
GB2057077A (en) * 1979-08-10 1981-03-25 Rat Tuotteet Oy Braking means for a trailer
US4842340A (en) * 1987-04-30 1989-06-27 Alfred Teves Gmbh Brake for a vehicle trailer
WO1993018947A1 (en) * 1992-03-24 1993-09-30 Null Robert L Trailer brake system with release apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB837144A (en) * 1957-10-23 1960-06-09 Howarth Padgett Henry Improvements in or relating to brakes for trailer vehicles
GB1445508A (en) * 1973-08-01 1976-08-11 Dba Sa Trailer disc brake and friction pad therefor
US4153143A (en) * 1978-01-12 1979-05-08 Dico Company, Inc. Trailer brake actuating assembly
GB2057077A (en) * 1979-08-10 1981-03-25 Rat Tuotteet Oy Braking means for a trailer
US4842340A (en) * 1987-04-30 1989-06-27 Alfred Teves Gmbh Brake for a vehicle trailer
WO1993018947A1 (en) * 1992-03-24 1993-09-30 Null Robert L Trailer brake system with release apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0952059A1 (en) * 1996-12-13 1999-10-27 Gordon Holmes Park brake mechanism for trailer overrun brake
GB2326449A (en) * 1997-04-05 1998-12-23 Peter Frederick Willmer Over-run trailer brakes
WO2003006287A1 (en) * 2001-07-13 2003-01-23 Gordon Holmes Over-run auto-reverse hydraulic braking system on a trailer
WO2009056485A1 (en) * 2007-10-29 2009-05-07 Robert Bosch Gmbh Self-reinforcing disc brake

Also Published As

Publication number Publication date
GB2278900B (en) 1996-11-20
GB9311695D0 (en) 1993-07-21

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20130606

732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20131010 AND 20131016