CA2237108A1 - Brake alert - Google Patents
Brake alert Download PDFInfo
- Publication number
- CA2237108A1 CA2237108A1 CA 2237108 CA2237108A CA2237108A1 CA 2237108 A1 CA2237108 A1 CA 2237108A1 CA 2237108 CA2237108 CA 2237108 CA 2237108 A CA2237108 A CA 2237108A CA 2237108 A1 CA2237108 A1 CA 2237108A1
- Authority
- CA
- Canada
- Prior art keywords
- brake
- commercial vehicle
- cab
- commercial
- air
- 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.)
- Abandoned
Links
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
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
- F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
- F16D66/025—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness sensing the position of parts of the brake system other than the braking members, e.g. limit switches mounted on master cylinders
-
- 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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The air brake assembly on commercial vehicles presently require the truck driver to determine, manually, whether the slack adjusters are out-of-adjustment regardless of whether there is a manual or automatic slack adjuster system in place. There is no cab display that alerts drivers of air braked commercial vehicles when maintenance related brake problems have reduced the retarding capacity of the brake system of the commercial vehicle.
The "Brake Alert" with reduce the subjective nature of the detection system for non-fuctioning air brake assemblies and will provide an early warning system to notify drivers of commercial vehicles that the air brake assemblies of the commercial vehicle may not be functioning within normal limits.
In this invention, a series of or one gauging system will be attached to the pushrod, s-cam shaft, brake lining and/or brake chamber of each air brake assembly on a commercial vehicle. If the push rod extends beyond the maximum allowed distance on application of the service (foundation) brakes then a switch will activate a warning light in the cab of the commercial vehicle. Equally, if the s-cam shaft does not rotate within normal limits when the service (foundation) brake is applied then a switch will activate a warning light in the cab of the commercial vehicle.
Still yet, if the brake application does not generate a minimum temperature rise gradient upon application of the service (foundation) brake then a switch will activate a warning light in the cab of the commercial vehicle. The driver, will, in turn, be notified that a particular brake assembly is not functioning within normal limits and a manual check and/or adjustment is needed immediately. In higher end models, a monitoring system will be attached to the gauging system(s) to record a history of the brake assembly malfunctions, which monitoring system can be accessed by a motor vehicle inspector, the owner of the commercial vehicle and/or the operator of the commercial vehicle.
The "Brake Alert" with reduce the subjective nature of the detection system for non-fuctioning air brake assemblies and will provide an early warning system to notify drivers of commercial vehicles that the air brake assemblies of the commercial vehicle may not be functioning within normal limits.
In this invention, a series of or one gauging system will be attached to the pushrod, s-cam shaft, brake lining and/or brake chamber of each air brake assembly on a commercial vehicle. If the push rod extends beyond the maximum allowed distance on application of the service (foundation) brakes then a switch will activate a warning light in the cab of the commercial vehicle. Equally, if the s-cam shaft does not rotate within normal limits when the service (foundation) brake is applied then a switch will activate a warning light in the cab of the commercial vehicle.
Still yet, if the brake application does not generate a minimum temperature rise gradient upon application of the service (foundation) brake then a switch will activate a warning light in the cab of the commercial vehicle. The driver, will, in turn, be notified that a particular brake assembly is not functioning within normal limits and a manual check and/or adjustment is needed immediately. In higher end models, a monitoring system will be attached to the gauging system(s) to record a history of the brake assembly malfunctions, which monitoring system can be accessed by a motor vehicle inspector, the owner of the commercial vehicle and/or the operator of the commercial vehicle.
Description
Specification Title:
Brake Alert General Character of the Class of Articles:
This invention relates to an advance warning system for air brake assemblies on commercial vehicle Background Art:
The air brake assembly on commercial vehicles presently require the truck driver to determine, manually, whether the slack adjusters are out-of adjustment regardless of whether there is a manual or automatic slack adjuster system in place. There is no cab display that alerts drivers of air braked commercial vehicles when maintenance related brake problems have reduced the retarding capacity of the brake system of the commercial vehicle. This includes out-of-adjustment conditions that develop as lining-to-drum clearance increases and requires that the applied pushrod stroke be further extended within the brake chamber. lJnlike hydraulically-braked passenger vehicles, the brake pedal travel of the air brake commercial vehicles is simply a metering valve and does not vary considerably with brake adjustment nor with the amount of application pressure applied to activate the service (foundation) brake.
The degradation in the brake system performance from maintenance-related and wear-related braking problems on air-braked commercial vehicles can significantly affect the stopping capability of the commercial vehicle resulting in a brake failure and a potentially serious accident. Such events as runaway commercial vehicles on steep grades, the inability of the commercial vehicle to stop to avoid a collision or instability of the commercial vehicle due to wheel lockup (eg. jackknifing) are some of the problems associated with brake failure in canmercial vehicles. For downhill runaway events, the primary cause is defective brake conditions due to mechanical deficiencies or out-o~adjustment brakes.
To help prevent air brake failures, it is imperative that the subjective nature of the brake checks be minimized. The reality is that many drivers of commercial vehicles, despite regulations in place in many jurisdictions, do not perform the roadside or pre-trip inspections to accepted standards. Equally, an inexperience driver, when performing the roadside inspections or pre-trip inspection within industry standards, may still fail to detect the defective brake condition.
Summary of the Inventive Idea:
This invention with reduce the subjective nature of the detection system for non-fuctioning air brake assemblies and will provide an early warning system to notify drivers of commercial vehicles that the air brake assemblies of the commercial vehicle may not be functioning within normal limits.
A combination of one or more gauging system will be attached to each of the air brake assemblies on a commercial vehicle. If the push rod extends beyond the maximum allowed distance on application of the service (foundation) brakes then a switch will activate a warning light in the cab of the commercial vehicle.
Equally, if the s-cam shaft does not rotate within normal limits when the service (foundation) brake is applied then a switch will activate a warning light in the cab of the commercial vehicle. Still yet, if the brake application does not generate a minimum temperature rise gradient upon application of the service (foundation) brake then a switch will activate a warning light in the cab of the commerocial vehicle.
The driver, will, in turn, be notified that a particular brake assembly is not functioning within normal limits and a manual check and/or adjustment is needed immediately. In higher end models, a monitoring system will be attached to the gauging system to record a history of the brake malfunctions, which monitoring system can be accessed by a motor vehicle inspector, the owner of the commercial vehicle and/or the operator of the commercial vehicle.
In a normal brake application, the service (foundation) brake chamber will be filled with air usually between 30-90 p.s.i.. The result is, the diaphragm within the brake chamber will move outward forcing the pushrod rod to move outward. As a result, the slack adjuster is rotated and then, in turn, the s-cam rotates.
lJltimately, the s-cam roller also rotates causing the brake shoe to be applied against the brake drum.
If the brake assembly is not functioning within normal limits then the pushrod will extend beyond the maximum allowed distance and the diaphragm will "bottom out"
within the brake chamber. In turn, the s-cam shaft will not rotate within normal limits and the brake lining will not be applied ~airxat the brake drum with sufficient force to generate adequate brake and, in turn, minimal heat will be generated due to frictional forces. The gauging systems) will register all the above noted symptoms of a non-functioning brake assembly.
Within the cab of the commercial vehicle will be a "light board" with a warning light for each brake assembly. Therefore, the driver will be notified as to which brake assembly is not functipning within normal limits. In higher end models, a monitoring system will be attached to the gauging system to record a history of the brake malfunctions, which monitoring system can be accessed by a motor vehicle inspector, the owner of the commercial vehicle and/or the operator of the commercial vehicle.
Brief Description of the Drawings:
Figure 1 is the side view of the pushrod (1 ) and brake chamber (2) with installation of the Brake Alert. On the pushrod (1 ) is a gauging devise (3) that turns the switching devise (4) when the pushr~od (1 ) extends beyond the maximum allowed distance. In turn, the warning light (5) on the "light board" (6) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Figure 2 is a side view of the s-cam shaft (8) that contains a gauging devise (9) that activates the switching devise ( 10) if the s-cam shaft does not rotate within normal limits upon application of the service brake. In turn, the warning light (5) on the "light board" (fr) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Figure 3 is the side view of the pushrod (1 ) and brake chamber (2) with installation of the Brake Alert. Within the brake chamber (2) is a gauging devise (11 ) that is push inwards upon application of the service brake. If the gauging devise ( 11 ) is retracted too far then a switching devise (12) will be activated. In turn, the warning light (5) on the "light board" (6) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Figure 4 is the side view of a typical brake assembly. A temperature measurement devise (13) will be installed in or around the brake lining to measure brake temperature rise upon application of the service brake. If the brake temperature rise does not reach a minimum level upon application then a switching devise will be activated (14). In turn, the warning light (5) on the "light board" (6) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Best Mode of Making the Invention:
The overall design of the brake assembly should be maintained except that one or more of the gauging mechanisms should be retrofitted within the brake assemblies presently in operation or attached to the brake assemblies presently in production. From the gauging mechanism(s), an electric wire will run from each brake assembly to the commercial vehicle cab where the "light board" will be installed to the dashboard of the commercial vehicle. The electric wire attach to the warning light on the "light board" which corresponds to the particular brake assembly.
Brake Alert General Character of the Class of Articles:
This invention relates to an advance warning system for air brake assemblies on commercial vehicle Background Art:
The air brake assembly on commercial vehicles presently require the truck driver to determine, manually, whether the slack adjusters are out-of adjustment regardless of whether there is a manual or automatic slack adjuster system in place. There is no cab display that alerts drivers of air braked commercial vehicles when maintenance related brake problems have reduced the retarding capacity of the brake system of the commercial vehicle. This includes out-of-adjustment conditions that develop as lining-to-drum clearance increases and requires that the applied pushrod stroke be further extended within the brake chamber. lJnlike hydraulically-braked passenger vehicles, the brake pedal travel of the air brake commercial vehicles is simply a metering valve and does not vary considerably with brake adjustment nor with the amount of application pressure applied to activate the service (foundation) brake.
The degradation in the brake system performance from maintenance-related and wear-related braking problems on air-braked commercial vehicles can significantly affect the stopping capability of the commercial vehicle resulting in a brake failure and a potentially serious accident. Such events as runaway commercial vehicles on steep grades, the inability of the commercial vehicle to stop to avoid a collision or instability of the commercial vehicle due to wheel lockup (eg. jackknifing) are some of the problems associated with brake failure in canmercial vehicles. For downhill runaway events, the primary cause is defective brake conditions due to mechanical deficiencies or out-o~adjustment brakes.
To help prevent air brake failures, it is imperative that the subjective nature of the brake checks be minimized. The reality is that many drivers of commercial vehicles, despite regulations in place in many jurisdictions, do not perform the roadside or pre-trip inspections to accepted standards. Equally, an inexperience driver, when performing the roadside inspections or pre-trip inspection within industry standards, may still fail to detect the defective brake condition.
Summary of the Inventive Idea:
This invention with reduce the subjective nature of the detection system for non-fuctioning air brake assemblies and will provide an early warning system to notify drivers of commercial vehicles that the air brake assemblies of the commercial vehicle may not be functioning within normal limits.
A combination of one or more gauging system will be attached to each of the air brake assemblies on a commercial vehicle. If the push rod extends beyond the maximum allowed distance on application of the service (foundation) brakes then a switch will activate a warning light in the cab of the commercial vehicle.
Equally, if the s-cam shaft does not rotate within normal limits when the service (foundation) brake is applied then a switch will activate a warning light in the cab of the commercial vehicle. Still yet, if the brake application does not generate a minimum temperature rise gradient upon application of the service (foundation) brake then a switch will activate a warning light in the cab of the commerocial vehicle.
The driver, will, in turn, be notified that a particular brake assembly is not functioning within normal limits and a manual check and/or adjustment is needed immediately. In higher end models, a monitoring system will be attached to the gauging system to record a history of the brake malfunctions, which monitoring system can be accessed by a motor vehicle inspector, the owner of the commercial vehicle and/or the operator of the commercial vehicle.
In a normal brake application, the service (foundation) brake chamber will be filled with air usually between 30-90 p.s.i.. The result is, the diaphragm within the brake chamber will move outward forcing the pushrod rod to move outward. As a result, the slack adjuster is rotated and then, in turn, the s-cam rotates.
lJltimately, the s-cam roller also rotates causing the brake shoe to be applied against the brake drum.
If the brake assembly is not functioning within normal limits then the pushrod will extend beyond the maximum allowed distance and the diaphragm will "bottom out"
within the brake chamber. In turn, the s-cam shaft will not rotate within normal limits and the brake lining will not be applied ~airxat the brake drum with sufficient force to generate adequate brake and, in turn, minimal heat will be generated due to frictional forces. The gauging systems) will register all the above noted symptoms of a non-functioning brake assembly.
Within the cab of the commercial vehicle will be a "light board" with a warning light for each brake assembly. Therefore, the driver will be notified as to which brake assembly is not functipning within normal limits. In higher end models, a monitoring system will be attached to the gauging system to record a history of the brake malfunctions, which monitoring system can be accessed by a motor vehicle inspector, the owner of the commercial vehicle and/or the operator of the commercial vehicle.
Brief Description of the Drawings:
Figure 1 is the side view of the pushrod (1 ) and brake chamber (2) with installation of the Brake Alert. On the pushrod (1 ) is a gauging devise (3) that turns the switching devise (4) when the pushr~od (1 ) extends beyond the maximum allowed distance. In turn, the warning light (5) on the "light board" (6) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Figure 2 is a side view of the s-cam shaft (8) that contains a gauging devise (9) that activates the switching devise ( 10) if the s-cam shaft does not rotate within normal limits upon application of the service brake. In turn, the warning light (5) on the "light board" (fr) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Figure 3 is the side view of the pushrod (1 ) and brake chamber (2) with installation of the Brake Alert. Within the brake chamber (2) is a gauging devise (11 ) that is push inwards upon application of the service brake. If the gauging devise ( 11 ) is retracted too far then a switching devise (12) will be activated. In turn, the warning light (5) on the "light board" (6) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Figure 4 is the side view of a typical brake assembly. A temperature measurement devise (13) will be installed in or around the brake lining to measure brake temperature rise upon application of the service brake. If the brake temperature rise does not reach a minimum level upon application then a switching devise will be activated (14). In turn, the warning light (5) on the "light board" (6) that corresponds with the brake assembly will be activated through an electrical wiring system (7).
Best Mode of Making the Invention:
The overall design of the brake assembly should be maintained except that one or more of the gauging mechanisms should be retrofitted within the brake assemblies presently in operation or attached to the brake assemblies presently in production. From the gauging mechanism(s), an electric wire will run from each brake assembly to the commercial vehicle cab where the "light board" will be installed to the dashboard of the commercial vehicle. The electric wire attach to the warning light on the "light board" which corresponds to the particular brake assembly.
Claims
Claims The embodiments of the invention in respect of which an exclusive property or privilege are claimed are as follows:
wherein there exists air brake assemblies on commercial vehicles without advance warning systems in place within the cab of the said vehicles to notify drivers that one or more of the air brake assemblies are not operating within normal limits then this invention provides an advanced warning system within the cab of the said vehicles by way of a cab display to warn drivers in the event that one or more of the brake assemblies on the said vehicles is not operating within normal limits, which operation is measured by one or a series of gauging mechanisms that monitor, upon application of the service (foundation) brake, the temperature rise gradient of the brake lining and/or brake drum, the distance of the stroke of the pushrod and/or the rotation of the s-cam assembly.
wherein there exists air brake assemblies on commercial vehicles without advance warning systems in place within the cab of the said vehicles to notify drivers that one or more of the air brake assemblies are not operating within normal limits then this invention provides an advanced warning system within the cab of the said vehicles by way of a cab display to warn drivers in the event that one or more of the brake assemblies on the said vehicles is not operating within normal limits, which operation is measured by one or a series of gauging mechanisms that monitor, upon application of the service (foundation) brake, the temperature rise gradient of the brake lining and/or brake drum, the distance of the stroke of the pushrod and/or the rotation of the s-cam assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2237108 CA2237108A1 (en) | 1998-06-18 | 1998-06-18 | Brake alert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2237108 CA2237108A1 (en) | 1998-06-18 | 1998-06-18 | Brake alert |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2237108A1 true CA2237108A1 (en) | 1999-12-18 |
Family
ID=29275679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2237108 Abandoned CA2237108A1 (en) | 1998-06-18 | 1998-06-18 | Brake alert |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2237108A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005090821A1 (en) * | 2004-03-24 | 2005-09-29 | Haldex Brake Products Ab | Sensing system for a disc brake |
-
1998
- 1998-06-18 CA CA 2237108 patent/CA2237108A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005090821A1 (en) * | 2004-03-24 | 2005-09-29 | Haldex Brake Products Ab | Sensing system for a disc brake |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |