CA1271432A - Vehicle braking system - Google Patents
Vehicle braking systemInfo
- Publication number
- CA1271432A CA1271432A CA000497830A CA497830A CA1271432A CA 1271432 A CA1271432 A CA 1271432A CA 000497830 A CA000497830 A CA 000497830A CA 497830 A CA497830 A CA 497830A CA 1271432 A CA1271432 A CA 1271432A
- Authority
- CA
- Canada
- Prior art keywords
- brake
- pad
- braking
- washer
- moveable
- 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.)
- Expired
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
- F16D53/00—Brakes with braking members co-operating with both the periphery and the inner surface of a drum, wheel-rim, or the like
-
- 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
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/54—Slack adjusters mechanical self-acting in one direction for adjusting excessive play by means of direct linear adjustment
-
- 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
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
- F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improved ring braking surface for vehicle and structure for mounting the same significantly increases performance and reliability. The braking surface has a host of cleaning holes passing therethrough, which allow dirt to clear from the brake. The mounting arrangement allows differential thermal expansion of the braking ring and the hub for engaging a rim of a wheel whereby problems associated with thermal stress are reduced. This mounting arrangement allows air to move freely, circulate over the braking surface and remove heat. A superior brake pad retraction mechanism allows a generally consistent non-operating brake pad separation due to a predetermined pad separation determined by cooperation of a lock washer slidable in one direction and lockable in the other in combination with a spacer washer which allows a predetermined movement of the lock washer urged in this direction by a spring.
An improved ring braking surface for vehicle and structure for mounting the same significantly increases performance and reliability. The braking surface has a host of cleaning holes passing therethrough, which allow dirt to clear from the brake. The mounting arrangement allows differential thermal expansion of the braking ring and the hub for engaging a rim of a wheel whereby problems associated with thermal stress are reduced. This mounting arrangement allows air to move freely, circulate over the braking surface and remove heat. A superior brake pad retraction mechanism allows a generally consistent non-operating brake pad separation due to a predetermined pad separation determined by cooperation of a lock washer slidable in one direction and lockable in the other in combination with a spacer washer which allows a predetermined movement of the lock washer urged in this direction by a spring.
Description
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aACKGROUND OF THE INVENTION
1 The present invention relates to so-called "ring"
brakes that have an axially extending cyllndrical drum ox riny presenting braking surfaces on either side of the rin0.
Sometimes, -these brakes are re~erred to as internal/external shoe drum brakes, althouyh -the drum is preferably a cylinder.
The prior art shows various forms of ring brakes, such as that disclosed in United States Patent 4238007, United States Patent 4,236,610, United States Patent 3,933,237 and United States Patent 3,974,~95 as but some examples.
A number of problems occur in ring brakes with respect to mounting of the ring on a wheel member, the compensation for unequal heat exposure throughout the braking system, the capability of the brake to eliminate the entry of or improve the exit of dirt that comes in contact with the braking surfaces and the operation of the brake pads to achieve a positive separation to avoid drag. These problems are not restricted to ring brakes, however, they do present substantial problems for brakes of this type.
There is a need in some applications for a highly efficient brake which essentially can be determined from the total swept braking surface, the effective braking surface over the swept area and the distance of the braking surface from -the wheel axial. Ring brakes present some advantages in that the - .
.
lX7~
1 braking sur~ace is at a ~ixed rad;ial spacing ~rom -the wheel axlal, whereas a disc brake this radial spacing is varyiny.
Drum bral<es have a fixed radial spaciny a:Lthough the braking surface is quite limited.
One particular application for e~ficient brakes, is in skock cars, where the cars are continually accelerating and decelerating and are exposed to very demanding requirernents.
The brakes presently used in these stock cars are often completely ineffective at the end o~ a race and heat build-up within the brakes can even cause cracking of the components due - to thermal stresses.
There remains a need to provide a brake which has improved control characteristics, to avoid situations such as wheel lockup, improved effectiveness with respect to the amount braking available and improvements in the life expectancy of the brakes.
SUMMARY OF THE INVENTION
According to the present invention, in a brake for -the wheel of a vehicle a ring braking mernber is mounted to rotate with the wheel of the vehicle about the wheel axis. The braking member extends generally parallel to the wheel axis and presents a surface either side of the braking member for inneraction with a braking pad. The ring brake member includes ~2~
a plurality of cleaning holes from one braking surface to the other with the holes being spaced about the circumference and across the width of the braking member to at least substantially overlap in a manner that an effective gap is provided across the braking surfaces when the ring brake is rotated about the axis 1 revolution resùlting from the combined effect of the holes. These holes assure dirt or grit which come in contact with the inner surface of the ring brake, will find their way out of the ring to the environment through one ln of the holes. This removal of dirt or the fact that dirt cannot collect within the ring member significantly improves the life of the ring member.
According to an aspect of the invention, the ring brake is mounted to a wheel mount member in a manner to accommodate different thermal expansion of different components ; in the braking system. The ring braking member is secured at a number of positions at a point spaced from the wheel axis to strut members which are joined to radially extending arms of a wheel mount member. These struts deflect under the forces caused by thermal expansion of the ring braking member, thus allowing movement of the ring braking member relative to the wheel mount.
According to yet a further aspect of the invention, a unique brake pad retract mechanism is provided, where the : . ' ' ~7~3~
1 distance of separation of the pads is essentially predetermined, and will not vary with brake pad wear. The structure includes a particular combination where one washer slideable on a pin with -the movement of the washer on the pin being determined by the extent of brake wear. This washer is only slideable in one direction and cooperates with a spacer member. The washer upon release of the brake mechanism can move into contact with the spacer through a predetermined distance, and at that point the brake pads are fully retracted. Thus with brake wear, the washer slides on the pin to a point that will result in the same brake pad separation upon release of the brake pads.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are shown in the drawings wherein;
Figure 1 is a perspective view of the brake for the wheel of a vehicle;
Figure 2 is a partial elevation showing securement of the ring braking member to the wheel mount member;
Figure 3 is a partial exploded perspective view of the ring brake and caliper associated therewith;
Figure 4 is a perspective exploded view of the ring brake without the caliper;
1 Flgure 5 is a partial perspective view showing one form of securlng of the ring brake to a strut;
Figures 6 and -/ show ~urther details of the securernent shown in Figure 5;
Figure 8 shows a partial perspective view of the ring braking member including central cooling conduits;
Figure 9 is a section taken along line A-A shown in Figure 8;
Figure 10 is a perspective view of the braking caliper showing the cooperation of the various components;
Figure 11 is a vertical section through the braking system;
Figure 12 and 13 are sectional views through the brake caliper showing a clear position in Figure 12 and a braking position in Figure 13;
Figure 14 is a side view of the brake caliper showing the return mechanism; and Figures 15 and 16 show the return mechanism in further detail.
DETAILED DESCRIPTION
The brake, generally shown as 2 uses a ring brake member 4 having opposed braking surfaces 4a and 4b. This braking member is concentrically mounted about the wheel axis 6 .
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1 and lncludes a number of cleaning holes indicated as 8 which preferably at least partially overlap w.ith an adjacent c1earliny hole, such that the entixe braking surfaces 4a and 4b include an effective gap there across when they are rotated thruugh one revolution about the wheel axis 6. These holes allow dirt and grit to clear out of the ring and thus substantially increases the life of the brake pads. It is preferred to leave the brake open to air circulation to achieve additional cooling. The holes render the open brake form more practicle.
1 The ring braking member 4 is secured to the circular flange 10 preferably by welding with the flange 10 including securing tabs 12 generally perpendicular to the flange. A
securing hole 13 is provided in the securing tabs 12 and cooperates with securing hole 20 provided in the individual struts 18. These struts 18 are positioned to join the ends of radially extending arms 16 of the wheel mounting member 14.
The wheel mounting member 14 is adapted to releasably secure the rim of a tire to the opposite side of the brake member 4.
The wheel mounting member 14 includes a splined wheel axial sleeve 22 which provides a support surface for the bearing surface 72 of the caliper mount 70.
The ring brake mernber 4 is secured by the cooperation of the tabs 12 and the struts 14 to the bolts 27 passing through the holes 20 and 13. Details of the securing of the . ~ :
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l tabs to the struts can be appreciated from a review of Figures 5, 6 and 7. To assist in positioning of the circular flange lO
during assembly or repair, aligning guides 24 have been provided on the arms 16 of the wheel mount 14 which approximately position the braking surface 14 with respect to the wheel axis 6.
A brake caliper 30 includes a support member 32, a fixed brake pad 34 and a moveable brake pad 36. This caliper is releasably held within the caliper mount 70 by the cooperation o-f the sleeve bracket 74, the bar 76 the spring 78 and pins 80. These components coopera-te to releasably receive the brake caliper 30 by compression of the spring 78 to provide sufficient space for insertion of the caliper. This provides a somewhat self adjusting mounting of the caliper 30 and also simplifies replacement of the caliper should it be required.
The brake caliper 30 includes a support member 32 having a central bore therethrough for receiving the piston 38, the sealing cup 40, the coil spring 42 and the hydraulic pressure inlet 59, as generally shown in Figures lO and 12.
The piston 38 acts against the rear face of the moveable brake pad 36 and provides a continuous bias urging the pad towards the fixed pad 34. Member 54 acts as a stop for piston 38. A
return mechanism 44 is provided which includes return spring 46, and pin 48 which is received within the moveab~e brake pad 36. This return mechanism 44 can be further : ' ~ . '- ' ' 3L27~3~
1 appreciated from a review of Figures 14, 15 and 16 where it can be seen that pin 4~ also carries a lock washer 52 slideable in one direction on the pin and lockable in the other direction. In this case, the washer is slidable on pin 48 once it bottoms out on face 53, to allow movement of the brake pad 36 towards the fixed pad 34 and locks in the direction opposite to arrow 51. A spacer member 50 is provided which cooperates with the lock washer 52 to provide a predetermined distance of retraction of the moveable pad 36 generally indicated as "X" in the drawings. This "X" is essentially predetermined and remains the same even with brake pad wear. The washer 52 is moveable within the spacer 50 and will bottom out against the spacer 50 as shown in Figure 15 when the hydraulic pressure is released from the inlet 54.
Full actuation of the brake forces the moveable pad 36 outwardly from the support member 32 and the washer 52 will bottom out against face 53 of the support member 32 at a distance "X" spaced from the interior portion of the spacer 50 as shown in Figure 16. Upon release of the hydraulic pressure, the washer 52 is locked on the pin 40 which is urged by spring 42 to pull the pacl in the direction indicated by arrow 51, until such time as the washer 52 bottoms out against the spacer 50. The spacer 50 is maintained in engagement with the face 53 due to the spring 42 acting upon the rear surface thereof.
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1 Therefore, the predetermlned movement oF the washer 52 within the spacer 50 accurately determines the spaciny between the moveable pad and the fixed pad regardless of wear of the pads.
Returning to Figure 3, it can be seen that the caliper mount 7û includes arms 82 which are part of the vehicle suspension or steering system.
Turning to Figures 5, 6 and 7 a speciFic cooperation oF the strut 18, the tab 12 is shown, where the collapsible filler 26 is sized to initially pass through holes 13 and 20 and upon tightening oF the bolt 27 and nut 28, the Filler 26 deforms to Fill the hole and to provide a tight fit. This allows a very simple arrangement for mounting of the circular flange 10 to the strut arms 18, and does not require the precision machining and placement oF the various holes ~0 and 13. It can be appreciated that some tolerance variation can exist and the filler 26 will merely accommodate these variations.
In a braking system, thermal expansion oF the components can be a problem and complicating mounting arrangements. Thermal expansion is accommodated in the present system as generally shown in Figure 2, where the struts 18 can deFlect outwardly as generally shown by the arrow 19 to .' ~ ' ' ', '' ' 1 accommodate the thermal expansion of the braking surf'ace.
Therefore, the circular flange 10 is in effect moveable over arms 16 which will have dif~erent thermal exposure and/or characteristics. The difference in -these thermal exposure and characteristics is accommodated by the struts 18 and the securement ot` the flange intermediate the arms 16.
The suppor-t member 32 of the brake caliper 30 is shown as a single casting, however, it can also be made as two pieces whereby the bore 43 in the outer part of the caliper could be avoided. In this case, the piston 38, the seal 40 and spring 42 would be received in bore 45 prior to assembly of the two pieces. Furthermore, brakepad 34 could be made part of the second piece.
The positive retract mechanism to achieve a ~airly wide brake pad separation, preferrable in the order of about .015 inches, the open brake with cleaning holes, allows the use of so~ter brake pads and improved sensitivity. The hydraulic system including the cup washer and piston provide better "feel" and allows additional control to effect braking and ; 20 reduce wheel lock. This device although suitable for many land vehicles is particularly suitable ~or stock cars where brake wear, wheel lock up and heat dissipation and compensation are most troublesome.
.. . . .
' ' ' ~7~
1 ~he riny braking member 4 and the flanye 10 have been shown as separate members welded together which is particularly applicable if the ring braking member is of stainless skeel.
In some circumstances it may be desirable to cast the ring braking member 4 and the flange 10 as an integral casting which is subsequently machined. In this case, a ductile iron is preferred. The tabs 12 can also be part of the casting.
Al-though various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
,:
." ` .
'' .
aACKGROUND OF THE INVENTION
1 The present invention relates to so-called "ring"
brakes that have an axially extending cyllndrical drum ox riny presenting braking surfaces on either side of the rin0.
Sometimes, -these brakes are re~erred to as internal/external shoe drum brakes, althouyh -the drum is preferably a cylinder.
The prior art shows various forms of ring brakes, such as that disclosed in United States Patent 4238007, United States Patent 4,236,610, United States Patent 3,933,237 and United States Patent 3,974,~95 as but some examples.
A number of problems occur in ring brakes with respect to mounting of the ring on a wheel member, the compensation for unequal heat exposure throughout the braking system, the capability of the brake to eliminate the entry of or improve the exit of dirt that comes in contact with the braking surfaces and the operation of the brake pads to achieve a positive separation to avoid drag. These problems are not restricted to ring brakes, however, they do present substantial problems for brakes of this type.
There is a need in some applications for a highly efficient brake which essentially can be determined from the total swept braking surface, the effective braking surface over the swept area and the distance of the braking surface from -the wheel axial. Ring brakes present some advantages in that the - .
.
lX7~
1 braking sur~ace is at a ~ixed rad;ial spacing ~rom -the wheel axlal, whereas a disc brake this radial spacing is varyiny.
Drum bral<es have a fixed radial spaciny a:Lthough the braking surface is quite limited.
One particular application for e~ficient brakes, is in skock cars, where the cars are continually accelerating and decelerating and are exposed to very demanding requirernents.
The brakes presently used in these stock cars are often completely ineffective at the end o~ a race and heat build-up within the brakes can even cause cracking of the components due - to thermal stresses.
There remains a need to provide a brake which has improved control characteristics, to avoid situations such as wheel lockup, improved effectiveness with respect to the amount braking available and improvements in the life expectancy of the brakes.
SUMMARY OF THE INVENTION
According to the present invention, in a brake for -the wheel of a vehicle a ring braking mernber is mounted to rotate with the wheel of the vehicle about the wheel axis. The braking member extends generally parallel to the wheel axis and presents a surface either side of the braking member for inneraction with a braking pad. The ring brake member includes ~2~
a plurality of cleaning holes from one braking surface to the other with the holes being spaced about the circumference and across the width of the braking member to at least substantially overlap in a manner that an effective gap is provided across the braking surfaces when the ring brake is rotated about the axis 1 revolution resùlting from the combined effect of the holes. These holes assure dirt or grit which come in contact with the inner surface of the ring brake, will find their way out of the ring to the environment through one ln of the holes. This removal of dirt or the fact that dirt cannot collect within the ring member significantly improves the life of the ring member.
According to an aspect of the invention, the ring brake is mounted to a wheel mount member in a manner to accommodate different thermal expansion of different components ; in the braking system. The ring braking member is secured at a number of positions at a point spaced from the wheel axis to strut members which are joined to radially extending arms of a wheel mount member. These struts deflect under the forces caused by thermal expansion of the ring braking member, thus allowing movement of the ring braking member relative to the wheel mount.
According to yet a further aspect of the invention, a unique brake pad retract mechanism is provided, where the : . ' ' ~7~3~
1 distance of separation of the pads is essentially predetermined, and will not vary with brake pad wear. The structure includes a particular combination where one washer slideable on a pin with -the movement of the washer on the pin being determined by the extent of brake wear. This washer is only slideable in one direction and cooperates with a spacer member. The washer upon release of the brake mechanism can move into contact with the spacer through a predetermined distance, and at that point the brake pads are fully retracted. Thus with brake wear, the washer slides on the pin to a point that will result in the same brake pad separation upon release of the brake pads.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are shown in the drawings wherein;
Figure 1 is a perspective view of the brake for the wheel of a vehicle;
Figure 2 is a partial elevation showing securement of the ring braking member to the wheel mount member;
Figure 3 is a partial exploded perspective view of the ring brake and caliper associated therewith;
Figure 4 is a perspective exploded view of the ring brake without the caliper;
1 Flgure 5 is a partial perspective view showing one form of securlng of the ring brake to a strut;
Figures 6 and -/ show ~urther details of the securernent shown in Figure 5;
Figure 8 shows a partial perspective view of the ring braking member including central cooling conduits;
Figure 9 is a section taken along line A-A shown in Figure 8;
Figure 10 is a perspective view of the braking caliper showing the cooperation of the various components;
Figure 11 is a vertical section through the braking system;
Figure 12 and 13 are sectional views through the brake caliper showing a clear position in Figure 12 and a braking position in Figure 13;
Figure 14 is a side view of the brake caliper showing the return mechanism; and Figures 15 and 16 show the return mechanism in further detail.
DETAILED DESCRIPTION
The brake, generally shown as 2 uses a ring brake member 4 having opposed braking surfaces 4a and 4b. This braking member is concentrically mounted about the wheel axis 6 .
~ ;~7~
~L
1 and lncludes a number of cleaning holes indicated as 8 which preferably at least partially overlap w.ith an adjacent c1earliny hole, such that the entixe braking surfaces 4a and 4b include an effective gap there across when they are rotated thruugh one revolution about the wheel axis 6. These holes allow dirt and grit to clear out of the ring and thus substantially increases the life of the brake pads. It is preferred to leave the brake open to air circulation to achieve additional cooling. The holes render the open brake form more practicle.
1 The ring braking member 4 is secured to the circular flange 10 preferably by welding with the flange 10 including securing tabs 12 generally perpendicular to the flange. A
securing hole 13 is provided in the securing tabs 12 and cooperates with securing hole 20 provided in the individual struts 18. These struts 18 are positioned to join the ends of radially extending arms 16 of the wheel mounting member 14.
The wheel mounting member 14 is adapted to releasably secure the rim of a tire to the opposite side of the brake member 4.
The wheel mounting member 14 includes a splined wheel axial sleeve 22 which provides a support surface for the bearing surface 72 of the caliper mount 70.
The ring brake mernber 4 is secured by the cooperation of the tabs 12 and the struts 14 to the bolts 27 passing through the holes 20 and 13. Details of the securing of the . ~ :
~.' , ' ' ' :
~ ~ 7~
l tabs to the struts can be appreciated from a review of Figures 5, 6 and 7. To assist in positioning of the circular flange lO
during assembly or repair, aligning guides 24 have been provided on the arms 16 of the wheel mount 14 which approximately position the braking surface 14 with respect to the wheel axis 6.
A brake caliper 30 includes a support member 32, a fixed brake pad 34 and a moveable brake pad 36. This caliper is releasably held within the caliper mount 70 by the cooperation o-f the sleeve bracket 74, the bar 76 the spring 78 and pins 80. These components coopera-te to releasably receive the brake caliper 30 by compression of the spring 78 to provide sufficient space for insertion of the caliper. This provides a somewhat self adjusting mounting of the caliper 30 and also simplifies replacement of the caliper should it be required.
The brake caliper 30 includes a support member 32 having a central bore therethrough for receiving the piston 38, the sealing cup 40, the coil spring 42 and the hydraulic pressure inlet 59, as generally shown in Figures lO and 12.
The piston 38 acts against the rear face of the moveable brake pad 36 and provides a continuous bias urging the pad towards the fixed pad 34. Member 54 acts as a stop for piston 38. A
return mechanism 44 is provided which includes return spring 46, and pin 48 which is received within the moveab~e brake pad 36. This return mechanism 44 can be further : ' ~ . '- ' ' 3L27~3~
1 appreciated from a review of Figures 14, 15 and 16 where it can be seen that pin 4~ also carries a lock washer 52 slideable in one direction on the pin and lockable in the other direction. In this case, the washer is slidable on pin 48 once it bottoms out on face 53, to allow movement of the brake pad 36 towards the fixed pad 34 and locks in the direction opposite to arrow 51. A spacer member 50 is provided which cooperates with the lock washer 52 to provide a predetermined distance of retraction of the moveable pad 36 generally indicated as "X" in the drawings. This "X" is essentially predetermined and remains the same even with brake pad wear. The washer 52 is moveable within the spacer 50 and will bottom out against the spacer 50 as shown in Figure 15 when the hydraulic pressure is released from the inlet 54.
Full actuation of the brake forces the moveable pad 36 outwardly from the support member 32 and the washer 52 will bottom out against face 53 of the support member 32 at a distance "X" spaced from the interior portion of the spacer 50 as shown in Figure 16. Upon release of the hydraulic pressure, the washer 52 is locked on the pin 40 which is urged by spring 42 to pull the pacl in the direction indicated by arrow 51, until such time as the washer 52 bottoms out against the spacer 50. The spacer 50 is maintained in engagement with the face 53 due to the spring 42 acting upon the rear surface thereof.
., - . ' :
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.
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1 Therefore, the predetermlned movement oF the washer 52 within the spacer 50 accurately determines the spaciny between the moveable pad and the fixed pad regardless of wear of the pads.
Returning to Figure 3, it can be seen that the caliper mount 7û includes arms 82 which are part of the vehicle suspension or steering system.
Turning to Figures 5, 6 and 7 a speciFic cooperation oF the strut 18, the tab 12 is shown, where the collapsible filler 26 is sized to initially pass through holes 13 and 20 and upon tightening oF the bolt 27 and nut 28, the Filler 26 deforms to Fill the hole and to provide a tight fit. This allows a very simple arrangement for mounting of the circular flange 10 to the strut arms 18, and does not require the precision machining and placement oF the various holes ~0 and 13. It can be appreciated that some tolerance variation can exist and the filler 26 will merely accommodate these variations.
In a braking system, thermal expansion oF the components can be a problem and complicating mounting arrangements. Thermal expansion is accommodated in the present system as generally shown in Figure 2, where the struts 18 can deFlect outwardly as generally shown by the arrow 19 to .' ~ ' ' ', '' ' 1 accommodate the thermal expansion of the braking surf'ace.
Therefore, the circular flange 10 is in effect moveable over arms 16 which will have dif~erent thermal exposure and/or characteristics. The difference in -these thermal exposure and characteristics is accommodated by the struts 18 and the securement ot` the flange intermediate the arms 16.
The suppor-t member 32 of the brake caliper 30 is shown as a single casting, however, it can also be made as two pieces whereby the bore 43 in the outer part of the caliper could be avoided. In this case, the piston 38, the seal 40 and spring 42 would be received in bore 45 prior to assembly of the two pieces. Furthermore, brakepad 34 could be made part of the second piece.
The positive retract mechanism to achieve a ~airly wide brake pad separation, preferrable in the order of about .015 inches, the open brake with cleaning holes, allows the use of so~ter brake pads and improved sensitivity. The hydraulic system including the cup washer and piston provide better "feel" and allows additional control to effect braking and ; 20 reduce wheel lock. This device although suitable for many land vehicles is particularly suitable ~or stock cars where brake wear, wheel lock up and heat dissipation and compensation are most troublesome.
.. . . .
' ' ' ~7~
1 ~he riny braking member 4 and the flanye 10 have been shown as separate members welded together which is particularly applicable if the ring braking member is of stainless skeel.
In some circumstances it may be desirable to cast the ring braking member 4 and the flange 10 as an integral casting which is subsequently machined. In this case, a ductile iron is preferred. The tabs 12 can also be part of the casting.
Al-though various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
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Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a brake for the wheel of a vehicle the combination of a ring braking member and opposed braking pads, said ring braking member being mounted to rotate with the wheel of such vehicle about the wheel axis, said braking member extending generally parallel to said wheel axis and presenting a surface either side of said braking member for interaction with said opposed braking pads, said ring brake member including a plurality of cleaning holes from one brake surface to the other, said holes being spaced about the circumference and across the width of said braking member to at least substantially overlap in a manner that is an effective gap across said braking surfaces when rotated about the axis one revolution resulting from the combined effect of said holes.
2. In a brake as claimed in Claim 1, wherein said holes at least substantially overlap with at least one adjacent hole.
3. In a brake as claimed in Claim 2, including a circular flange secured to said braking surfaces at one edge thereof, said flange including mounting tabs extending at an angle therefrom for securing said flange and said braking surfaces to a wheel mount member.
4. In a brake as claimed in Claim 3, wherein said wheel mount member includes generally equally spaced radially extending arms and strut means intermediate and secured to the ends of said arms which cooperate with said tabs and secure said flange, said struts deflecting as required to accommodate thermal expansion or contraction of said flange and braking member.
5. In a brake as claimed in Claim 4, wherein at least 5 radially extending arms are present and a clear space is provided intermediate said arms and said flange for providing a passageway for ambient air to the interior surface of said braking member.
6. In a brake as claimed in Claim 5, wherein said armed wheel mount includes a splined central sleeve for cooperating with a splined axle shaft.
7. In a brake as claimed in Claim 5, wherein said flange is welded to said braking surfaces and said tabs extend generally perpendicular to said flange, said tabs being mechanically secured to said struts generally centrally of the length of said struts.
8. In a brake as claimed in Claim 7, wherein said braking surfaces are of a low grade stainless steel.
9. In a brake as claimed in Claim 3, wherein said holes are of a diameter about 3/8 of an inch and are spaced at least about 2 1/2 inches circumfirentially.
10. In a brake as claimed in Claim 1, wherein said opposed pads are part of a brake caliper, said brake caliper having a structural member supporting one of said opposed pads which is fixed with the other opposed pad being movable, a hydraulically actuated piston means received in said structural member for moving said moveable pad towards said fixed pad, means for exerting a bias on said moveable pad urging movement thereof towards said fixed pad, and spring means associated with said moveable pad for urging said moveable pad to a release position, said spring means including an arrangement urging said moveable pad to a predetermined release position relative to said fixed pad, said predetermined release position resulting from the cooperation of a spacer member and a locking washer each secured on a pin member, said washer allowing sliding movement in one direction of said pin and locking in the other direction and moveable within said spacer a predetermined amount equal to the desired clear space between released brake pads, and spring means acting on said spacer member urging said moveable pad to a release position said spacer member contacting said support member in a release position of said pad under the influence of said spring means and said washer bottoming out within said spacer member.
11. In a brake as claimed in Claim 10, wherein said spacer member is a belleville washer and said locking member is a multi-toothed locking washer, said washers being carried by a pin one end of which engages said moveable pad, said pin passing through a portion of said structural member and including a spring return engaging said belleville washer and the other end of said pin urging said belleville washer against said structural member and urging said pin to move until said locking washer bottoms out in said belleville washer.
12. In a brake as claimed in Claim 1, wherein one of said opposed pads is a generally fixed pad for engaging one side of a braking surface and the other opposed pad is a moveable pad for engaging the opposite side of the braking surface, each of said pads being supported by a support member, said moveable pad including hydraulic means for actuating said brake and release means for urging said pad to a release position;
and wherein said release means includes pin means for engaging said moveable pad and passing through a portion of said support member, spring means intermediate the end of said pin and said support member for biasing said moveable pad to a release position and compressing in response to movement of said pad under the influence of said hydraulic means, a locking member slidable in one direction on said pin caused by movement of said moveable pad, and a spacer member intermediate said spring and said washer, said washer being moveable within said spacer, said washer bottomming out on said support member during actuation of the brake and bottoming out within said spacer during release of said brake, such that movement of said moveable pad after release of said hydraulic means corresponds to the movement of said washer within said spacer thereby automatically adjusting for brake pad wear.
and wherein said release means includes pin means for engaging said moveable pad and passing through a portion of said support member, spring means intermediate the end of said pin and said support member for biasing said moveable pad to a release position and compressing in response to movement of said pad under the influence of said hydraulic means, a locking member slidable in one direction on said pin caused by movement of said moveable pad, and a spacer member intermediate said spring and said washer, said washer being moveable within said spacer, said washer bottomming out on said support member during actuation of the brake and bottoming out within said spacer during release of said brake, such that movement of said moveable pad after release of said hydraulic means corresponds to the movement of said washer within said spacer thereby automatically adjusting for brake pad wear.
13. In a brake as claimed in Claim 3, wherein said ring braking member, and said flange use an integral casting.
14. In a brake as claimed in Claim 13, wherein said tabs are part of said integral casting.
15. In a brake as claimed in Claim 13, wherein said casting is of a ductile iron.
16. In a brake as claimed in claim 14, wherein said casting is of a ductile iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000497830A CA1271432A (en) | 1985-12-17 | 1985-12-17 | Vehicle braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000497830A CA1271432A (en) | 1985-12-17 | 1985-12-17 | Vehicle braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1271432A true CA1271432A (en) | 1990-07-10 |
Family
ID=4132107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000497830A Expired CA1271432A (en) | 1985-12-17 | 1985-12-17 | Vehicle braking system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1271432A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993019307A1 (en) * | 1992-03-17 | 1993-09-30 | Eric Siegrist | Shielded vehicle brake |
| WO1995012765A2 (en) * | 1989-01-17 | 1995-05-11 | Eric Siegrist | Ring brake cooled by air flow |
| WO2004031605A2 (en) * | 2002-10-04 | 2004-04-15 | Eric Siegrist | Brake assembly and brake pad |
-
1985
- 1985-12-17 CA CA000497830A patent/CA1271432A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5293967A (en) * | 1989-01-17 | 1994-03-15 | Eric Siegrist | Shielded vehicle brake |
| WO1995012765A2 (en) * | 1989-01-17 | 1995-05-11 | Eric Siegrist | Ring brake cooled by air flow |
| WO1995012765A3 (en) * | 1989-01-17 | 1995-05-26 | Eric Siegrist | Ring brake cooled by air flow |
| WO1993019307A1 (en) * | 1992-03-17 | 1993-09-30 | Eric Siegrist | Shielded vehicle brake |
| WO2004031605A2 (en) * | 2002-10-04 | 2004-04-15 | Eric Siegrist | Brake assembly and brake pad |
| WO2004031605A3 (en) * | 2002-10-04 | 2004-06-17 | Eric Siegrist | Brake assembly and brake pad |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |