CA1109810A - Shoe retaining torsional spring for brake assembly - Google Patents
Shoe retaining torsional spring for brake assemblyInfo
- Publication number
- CA1109810A CA1109810A CA327,692A CA327692A CA1109810A CA 1109810 A CA1109810 A CA 1109810A CA 327692 A CA327692 A CA 327692A CA 1109810 A CA1109810 A CA 1109810A
- Authority
- CA
- Canada
- Prior art keywords
- brake shoes
- brake
- anchor pin
- torsional spring
- shoe
- 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
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- Braking Arrangements (AREA)
Abstract
APPLICATION OF: DENNIS A. BORUGIAN
TITLE: SHOE RETAINING TORSIONAL
SPRING FOR BRAKE
ASSEMBLY
ABSTRACT
A brake assembly for a vehicle includes a spider, a pair of brake shoes, an S-cam affixed to one end of the spider for moving the brake shoes in a radial direction, anchor pin means supported on the spider in a position opposite from the S-cam. Each of the brake shoes has one end engaging and pivotable about the anchor pin and an opposite end engaging the S-cam. The brake shoes each include a web, a shoe table and friction pad means supported on the shoe table. Actuation of the S-cam effects pivotal movement of the brake shoes above the anchor pin to brake a vehicle associated therewith. A return spring is provided interconnecting the opposite ends of the brake shoes for biasing the brake shoes toward a nonactuated position and a shoe retaining torsional spring is provided having a first end connected to the shoe table of one of the brake shoes adjacent the one end thereof, a second end connected to the shoe table of the other of the brake shoes adjacent the one end thereof and a substantially annular portion disposed around the anchor pin and interconnecting the first and second end portions.
TITLE: SHOE RETAINING TORSIONAL
SPRING FOR BRAKE
ASSEMBLY
ABSTRACT
A brake assembly for a vehicle includes a spider, a pair of brake shoes, an S-cam affixed to one end of the spider for moving the brake shoes in a radial direction, anchor pin means supported on the spider in a position opposite from the S-cam. Each of the brake shoes has one end engaging and pivotable about the anchor pin and an opposite end engaging the S-cam. The brake shoes each include a web, a shoe table and friction pad means supported on the shoe table. Actuation of the S-cam effects pivotal movement of the brake shoes above the anchor pin to brake a vehicle associated therewith. A return spring is provided interconnecting the opposite ends of the brake shoes for biasing the brake shoes toward a nonactuated position and a shoe retaining torsional spring is provided having a first end connected to the shoe table of one of the brake shoes adjacent the one end thereof, a second end connected to the shoe table of the other of the brake shoes adjacent the one end thereof and a substantially annular portion disposed around the anchor pin and interconnecting the first and second end portions.
Description
SHOE RETAINING TORSIONAL SPRING FOR BRAKE AssEr5BLy Background of the Invention Field of the Invention The present invention relates to a brake assembly for a vehicle and more specifically a brake assembly wherein a torsional shoe retaining spring is utilized.
The torsional shoe retaining spring includes a first end connected to one of the brake shoes and a second end connected to the other of the brake shoes. A substantially annular portion is interposed between the first and second ends and is disposed around the anchor pin.
Background of the Invention Two retaining springs are known in the brake art. In most of the known brakes the shoe retaining springs are coil springs. Such coil springs are both expensive and heavy when compared to the torsional spring of the present invention.
Summary of the Invention The present invention relates to a new and improved brake assembly for a vehicle including a spider member, a pair of brake shoes, actuating means affixed to one end of the spider member, anchor pin means supported on the spider member in a position opposite from the one end of the spider member on which the actuating means is secured, each of the brake shoes having one end engaging and pivotable about the anchor pin means and an opposite end engaging actuating means, each of the brake shoes further including a web, a shoe table and friction pad . ~ ' ~ J~
means supported on the shoe table, actuation of the actuating means effecting pivotable movement of the brake shoes about the anchor pin to brake a vehicle associated therewith, return spring means and a torsional shoe retaining spring having first and second ends connected to the shoe table of one of the brake shoes and a substantially annular portion disposed around the anchor pin means and interconnecting the first and second end portions.
The present invention provides a new and improved brake assembly for a vehicle as set forth in the next preceding paragraph wherein the anchor pin means includes a cylindrical anchor pin having a first end and a second end, the second end of the anchor pin being rigidly secured to the spider member to support the ancnor pin in a cantilevered fashion.
Description of the Drawings FIG. 1 is a plan view of a brake assembly of the present invention illustrating the brake in its unactuated condition.
FIG. 2 is a cross-sectional view taken approximately along lines 2-2 of FIG. 1 more fully illustrating the anchor pin and torsional shoe retaining spring.
FIG. 3 is a fragmentary view of the anchor pin and brake shoes illustrating another embodiment of the torsional shoe retaining spring.
,.~. ^
~ 7 Description of the Preferred Embodiment -Referring to the drawings and more particularly to FIG. 1 a brake assembly 10 for use with a vehicle (not illustrated) is provided. The brake assemb~y 10 is a heavy-duty brake assembly which is preferably utilized with a vehicle, such as a truck. The brake assembly 10 includes a spider member 12 which includes a plurality of openings 1~ disposed therein. The spider member 12 is adapted to be supported on an axle mounting face (not illustrated) preferably of a truck. To this end, a plurality of bolts, not illustrated, can be inserted through the openings 14 disposed in the spider member 12 to secure the brake mechanism 10 to the axle mounting face in a well-known manner. A dust shield 15 may be connected to the spider member 12 to shield the brake mechanism 10 from road generated dust in a well-known manner.
An air chamber mounting bracket assembly 16 is rigidly secured to one end of the spider member 12.
The air chamber mounting bracket assembly 16 includes a tube portion 18. An air chamber, not illustrated, may be mounted in a well-known manner on the bracket assembly 16.
A cam shaft 22 having an S-cam member 24 disposed at one end thereof is supported for rotation about the longitudinal axis of the cam shaft 22 in the tube portion 18 of the air chamber mounting bracket assembly 16.
An anchor pin 30, more fully illustrated in FIG. 2, is receiYed within an opening 32 disposed in the spider member 12 in a location diametrically opposite to the location at '.
.~ , .
' . ,. ' - , ' 81~
,.~, which the S-cam 24 is supported by the spider 12. The anchor pin 30 includes a cylindrical exterior surface 31 and an end portion 34 which is rigidly secured in the opening 32 in the spider member 12 in a cantilevered fashion.
The anchor pin 30 includes an opposite end portion 36 having a ridge 38 formed thereon. The ridge 38 cooperates with brake shoes engaging therewith to prevent sliding movement of the brake shoes parallel to the longitudinal axis of the anchor pin 30.
A reinforcing plate 40 is secured to a flanged portion 42 on the spider member 12. The reinforcing plate 40 includes an opening 44 disposed therein which receives the one end 34 of the anchor pin 30 therein. Suitable means, such as welding, is utilized to rigidly secure the one end 34 of the anchor pin 30 to the reinforcing plate 40. Thus, the anchor pin 30 is supported in a cantilevered fashion by the cooperation of the reinforcing plate 40 and the opening 32 in the spider member 12.
A pair of brake shoes 50, 52 are supported by the spider member 12. Each of the brake shoes 50, 52 includes a pair of webs 56, a shoetable 58 having one side connected to the webs 56, and friction pad members 60 connected to the opposite side of the shoetable 58 in a well-known manner.
The upper end of each of the web members 56, as is illustrated in FIG. 1, includes an opening 62 in which is journalled a roller pin 64. The roller pins 64 cooperate with the S-cam member 24 to effect pivotal movement of the brake shoes 50, 52 as will be described more fully hereinbelow. The lower . ~
;3lQ
, . . .
end of each of the webs 56, as is illustrated in FIG. 1, includes an arcuate anchor pin slot 66 which is adapted to pivotably engage the cylindrical exterior surface of the anchor pin 30.
A return spring means 68 interconnects the upper ends of the brake shoes 50, 52 as is illustrated in FIG. 1, to bias the brake shoes 50, 52 toward their unactuated position.
The return spring means 68 includes a coil spring 70 which has one end connected to a pin 72 disposed on the web 10 56 of the brake shoe 50 and a coil spring 74 which has one end connected to a pin 76 disposed on the web 56 of the brake shoe 52. The coil springs 70 and 74 are interconnected by a link member 78 and bias the brake shoes 50, 52 in a radially inwardly direction against the S-cam 24 toward 15 their unactuated position.
A shoe retaining torsion spring 80 is provided for interconnecting the lower ends of the brake shoes 50, 52 and for biasing the brake shoes to effect continual engagement of the anchor pin slots 66 with the cylindrical surface 31 20 of anchor pin 30. The shoe retaining torsion spring 80 includes an annular portion 82 which extends around the cylindrical surface 31 of the anchor pin 30. The annular portion 82 includes a first end having a hooked portion 81 disposed thereon and a second end having a hooked portion 83 25 disposed thereon. An opening 84 is disposed in the shoetable 58 of the brake shoe 50 and an opening 86 is disposed in the shoetable 58 of the brake shoe 52. The first hooked portion 81 of the torsion spring 80 is hookingly engageable with the opening 84 disposed in the 30 brake shoe 50 and the hooked portion 83 is hookingly engageable with the opening 86 disposed in the shoetable 58 of the brake shoe 52.
.~
~'.' The torsion spring 80 provides a biaslng force via the hooked portions 81 and 83 on the brake shoes 50 and 52 which bias the brake shoes toward the anchor pin 30 to insure that the anchor pin slots 66 of the brake shoes 50, 52 remain in engagement with the cylindrical surface 31 of the anchor pin 30. As is illustrated in FIG. 1, the hooked portions mav extend from behind the back surface 57 of the shoetable 58 through to the front surface 59 of the shoetable on which the friction pads 60 are disposed. Additionally, as is illustrated in FIG. 3, the hooked portions of the torsional spring 80 can extend along the front surface 59 of the shoetables 58 and then extend through the openings 8~, 86 toward the back surface 57 of the shoetable 58. Such a construction for the torsional spring 80 reduces the cost and weight of known shoe retaining springs which generally utilize coil springs which are both heavier and more costly than the torsional spring utilized in the present invention.
Additionally, the construction of the hooked portions 81, 83 of the torsional spring 80 allows the hooked portions to lie relatively flat along the surface 59 of the shoetable 58.
This allows the friction pads 60 to wear substantially without the hooked portions being in contact with the brake shoe upon application of the brakes. Thus, long life of the brake mechanism is provided whereby the brake pads 60 can wear down almost to the shoetables 58 without disturbing the torsion retaining spring.
The ridge 38 on the anchor pin 30 has a diameter which is normally greater than the diameter of the annular portion 82 of the torsional spring 80. Thus, the ridge 38 prevents movement of the torsional spring 80 in a direction parallel to the longitudinal axis of the anchor pin 30 over the ridge portion 38 as is illustrated in FIG. 2. The hooked ends 81, 83 of the torsional spring 80 can be biased toward each other to thereby increase the diameter of the annular portion 82 of the torsional spring 80. The diameter of the annular portion 82 can be increased to a diameter which is greater than that of the ridge 38 of the anchor pin to allow the torsional spring 80 to be removed from the anchor pin 30.
Such a construction enables the torsional spring 80 to be easily placed and removed from the anchor pin 30 by merely compressing the ends 81, 83 toward each other. After the torsional spring 80 is located on the cylindrical surface 31 of the anchor pin 30, the ends 81, 83 can be released and the natural resiliency of the torsional spring will cause the annular portion 82 to assume an inside diameter slightly greater than the diameter of the cylindrical surface 31 of the anchor pin 30. The inside diameter of the annular portion 82 of the torsional spring 80 is slightly larger than the cylindrical surface 31 of the anchor pin 30 to enable the hooked end portions 81, 83 to stretch apart to hookingly engage with the openings in the shoetables S8.
When the end portions 81, 83 are stretched apart the inside diameter of the annular portion 82 will decrease slightly.
The torsional spring 80 may remain on the anchor pin 30 when either of the brake shoes 50, 52 are removed from the brake assembly 10. To remove a brake shoe, one would disconnect the shoe return spring 68. This would allow the brake shoes 50, 52 to pivot in a clam-shell fashion about the anchor pin 30. The torsional retaining spring 80 would be hookingly engaged with each of the shoes 50, 52. Each of the shoes could then be hookingly disengaged from the torsion spring 80 without removing the torsion spring 80 from the anchor pin 30. Such a construction and mounting of the torsion spring 80 allows one of the shoes to be removed without the other shoe falling off.
, . ,,, ~.
When it is desired to actuate brake mechanism 10, the S-cam 24 will be rotated in a counterclockwise direction as viewed in FIG. 1 by actuation of the air chamber, not illustrated, which will effect rotation of the cam shaft 22 in a well-known manner. Counterclockwise rotation of the S-cam 24 will cause the S-cam 24 to engage with the roller pins 64 and effect a pivotal movement in an outward radial direction of the brake shoes 50, 52 about the anchor pin 30.
This will cause the brake pads 60 to engage with a brake drum, not illustrated, in a well-known manner to effect braking of a vehicle associated therewith. When the pressure in the air chamber is released, the return spring means 68 will bias the brake shoes 50, 52 in a radially inwardly direction to rotate the S-cam 24 in a clockwise direction and effect disengagement of the brake pad 60 from the brake drum. During this entire operation the torsional shoe retaining spring 80 will insure that the brake shoes 50, 52 continue to engage the anchor pin 30.
From the foregoing it should be apparent that a new and improved brake assembly for a vehicle has been provided which includes a spider member, a pair of brake shoes, actuating means affixed to one end of the spider member for actuating the brake shoes, anchor pin means supported on the spider member in a position opposite from the one end of the spider member on which the actuating means is secured.
Each of the brake shoes has an anchor pin or one end engaging and pivotable about the anchor pin means and an opposite or S-cam end engaging the actuating means and a web, a shoe table and friction pad means supported on~-the shoetable.
Return spring is provided to interconnect the S-cam ends of the brake shoes for biasing the brake shoes toward a nonactuated position and a shoe retaining torsional spring is provided having a first end connected to the shoetable of one of the brake shoes adjacent the anchor pin end and a second end connected to the shoetable of the other of the brake shoes adjacent the anchor pin end thereof.
substantially annular portion is disposed around the anchor pin means and interconnects the first and second end portions of the torsional spring.
~.
The torsional shoe retaining spring includes a first end connected to one of the brake shoes and a second end connected to the other of the brake shoes. A substantially annular portion is interposed between the first and second ends and is disposed around the anchor pin.
Background of the Invention Two retaining springs are known in the brake art. In most of the known brakes the shoe retaining springs are coil springs. Such coil springs are both expensive and heavy when compared to the torsional spring of the present invention.
Summary of the Invention The present invention relates to a new and improved brake assembly for a vehicle including a spider member, a pair of brake shoes, actuating means affixed to one end of the spider member, anchor pin means supported on the spider member in a position opposite from the one end of the spider member on which the actuating means is secured, each of the brake shoes having one end engaging and pivotable about the anchor pin means and an opposite end engaging actuating means, each of the brake shoes further including a web, a shoe table and friction pad . ~ ' ~ J~
means supported on the shoe table, actuation of the actuating means effecting pivotable movement of the brake shoes about the anchor pin to brake a vehicle associated therewith, return spring means and a torsional shoe retaining spring having first and second ends connected to the shoe table of one of the brake shoes and a substantially annular portion disposed around the anchor pin means and interconnecting the first and second end portions.
The present invention provides a new and improved brake assembly for a vehicle as set forth in the next preceding paragraph wherein the anchor pin means includes a cylindrical anchor pin having a first end and a second end, the second end of the anchor pin being rigidly secured to the spider member to support the ancnor pin in a cantilevered fashion.
Description of the Drawings FIG. 1 is a plan view of a brake assembly of the present invention illustrating the brake in its unactuated condition.
FIG. 2 is a cross-sectional view taken approximately along lines 2-2 of FIG. 1 more fully illustrating the anchor pin and torsional shoe retaining spring.
FIG. 3 is a fragmentary view of the anchor pin and brake shoes illustrating another embodiment of the torsional shoe retaining spring.
,.~. ^
~ 7 Description of the Preferred Embodiment -Referring to the drawings and more particularly to FIG. 1 a brake assembly 10 for use with a vehicle (not illustrated) is provided. The brake assemb~y 10 is a heavy-duty brake assembly which is preferably utilized with a vehicle, such as a truck. The brake assembly 10 includes a spider member 12 which includes a plurality of openings 1~ disposed therein. The spider member 12 is adapted to be supported on an axle mounting face (not illustrated) preferably of a truck. To this end, a plurality of bolts, not illustrated, can be inserted through the openings 14 disposed in the spider member 12 to secure the brake mechanism 10 to the axle mounting face in a well-known manner. A dust shield 15 may be connected to the spider member 12 to shield the brake mechanism 10 from road generated dust in a well-known manner.
An air chamber mounting bracket assembly 16 is rigidly secured to one end of the spider member 12.
The air chamber mounting bracket assembly 16 includes a tube portion 18. An air chamber, not illustrated, may be mounted in a well-known manner on the bracket assembly 16.
A cam shaft 22 having an S-cam member 24 disposed at one end thereof is supported for rotation about the longitudinal axis of the cam shaft 22 in the tube portion 18 of the air chamber mounting bracket assembly 16.
An anchor pin 30, more fully illustrated in FIG. 2, is receiYed within an opening 32 disposed in the spider member 12 in a location diametrically opposite to the location at '.
.~ , .
' . ,. ' - , ' 81~
,.~, which the S-cam 24 is supported by the spider 12. The anchor pin 30 includes a cylindrical exterior surface 31 and an end portion 34 which is rigidly secured in the opening 32 in the spider member 12 in a cantilevered fashion.
The anchor pin 30 includes an opposite end portion 36 having a ridge 38 formed thereon. The ridge 38 cooperates with brake shoes engaging therewith to prevent sliding movement of the brake shoes parallel to the longitudinal axis of the anchor pin 30.
A reinforcing plate 40 is secured to a flanged portion 42 on the spider member 12. The reinforcing plate 40 includes an opening 44 disposed therein which receives the one end 34 of the anchor pin 30 therein. Suitable means, such as welding, is utilized to rigidly secure the one end 34 of the anchor pin 30 to the reinforcing plate 40. Thus, the anchor pin 30 is supported in a cantilevered fashion by the cooperation of the reinforcing plate 40 and the opening 32 in the spider member 12.
A pair of brake shoes 50, 52 are supported by the spider member 12. Each of the brake shoes 50, 52 includes a pair of webs 56, a shoetable 58 having one side connected to the webs 56, and friction pad members 60 connected to the opposite side of the shoetable 58 in a well-known manner.
The upper end of each of the web members 56, as is illustrated in FIG. 1, includes an opening 62 in which is journalled a roller pin 64. The roller pins 64 cooperate with the S-cam member 24 to effect pivotal movement of the brake shoes 50, 52 as will be described more fully hereinbelow. The lower . ~
;3lQ
, . . .
end of each of the webs 56, as is illustrated in FIG. 1, includes an arcuate anchor pin slot 66 which is adapted to pivotably engage the cylindrical exterior surface of the anchor pin 30.
A return spring means 68 interconnects the upper ends of the brake shoes 50, 52 as is illustrated in FIG. 1, to bias the brake shoes 50, 52 toward their unactuated position.
The return spring means 68 includes a coil spring 70 which has one end connected to a pin 72 disposed on the web 10 56 of the brake shoe 50 and a coil spring 74 which has one end connected to a pin 76 disposed on the web 56 of the brake shoe 52. The coil springs 70 and 74 are interconnected by a link member 78 and bias the brake shoes 50, 52 in a radially inwardly direction against the S-cam 24 toward 15 their unactuated position.
A shoe retaining torsion spring 80 is provided for interconnecting the lower ends of the brake shoes 50, 52 and for biasing the brake shoes to effect continual engagement of the anchor pin slots 66 with the cylindrical surface 31 20 of anchor pin 30. The shoe retaining torsion spring 80 includes an annular portion 82 which extends around the cylindrical surface 31 of the anchor pin 30. The annular portion 82 includes a first end having a hooked portion 81 disposed thereon and a second end having a hooked portion 83 25 disposed thereon. An opening 84 is disposed in the shoetable 58 of the brake shoe 50 and an opening 86 is disposed in the shoetable 58 of the brake shoe 52. The first hooked portion 81 of the torsion spring 80 is hookingly engageable with the opening 84 disposed in the 30 brake shoe 50 and the hooked portion 83 is hookingly engageable with the opening 86 disposed in the shoetable 58 of the brake shoe 52.
.~
~'.' The torsion spring 80 provides a biaslng force via the hooked portions 81 and 83 on the brake shoes 50 and 52 which bias the brake shoes toward the anchor pin 30 to insure that the anchor pin slots 66 of the brake shoes 50, 52 remain in engagement with the cylindrical surface 31 of the anchor pin 30. As is illustrated in FIG. 1, the hooked portions mav extend from behind the back surface 57 of the shoetable 58 through to the front surface 59 of the shoetable on which the friction pads 60 are disposed. Additionally, as is illustrated in FIG. 3, the hooked portions of the torsional spring 80 can extend along the front surface 59 of the shoetables 58 and then extend through the openings 8~, 86 toward the back surface 57 of the shoetable 58. Such a construction for the torsional spring 80 reduces the cost and weight of known shoe retaining springs which generally utilize coil springs which are both heavier and more costly than the torsional spring utilized in the present invention.
Additionally, the construction of the hooked portions 81, 83 of the torsional spring 80 allows the hooked portions to lie relatively flat along the surface 59 of the shoetable 58.
This allows the friction pads 60 to wear substantially without the hooked portions being in contact with the brake shoe upon application of the brakes. Thus, long life of the brake mechanism is provided whereby the brake pads 60 can wear down almost to the shoetables 58 without disturbing the torsion retaining spring.
The ridge 38 on the anchor pin 30 has a diameter which is normally greater than the diameter of the annular portion 82 of the torsional spring 80. Thus, the ridge 38 prevents movement of the torsional spring 80 in a direction parallel to the longitudinal axis of the anchor pin 30 over the ridge portion 38 as is illustrated in FIG. 2. The hooked ends 81, 83 of the torsional spring 80 can be biased toward each other to thereby increase the diameter of the annular portion 82 of the torsional spring 80. The diameter of the annular portion 82 can be increased to a diameter which is greater than that of the ridge 38 of the anchor pin to allow the torsional spring 80 to be removed from the anchor pin 30.
Such a construction enables the torsional spring 80 to be easily placed and removed from the anchor pin 30 by merely compressing the ends 81, 83 toward each other. After the torsional spring 80 is located on the cylindrical surface 31 of the anchor pin 30, the ends 81, 83 can be released and the natural resiliency of the torsional spring will cause the annular portion 82 to assume an inside diameter slightly greater than the diameter of the cylindrical surface 31 of the anchor pin 30. The inside diameter of the annular portion 82 of the torsional spring 80 is slightly larger than the cylindrical surface 31 of the anchor pin 30 to enable the hooked end portions 81, 83 to stretch apart to hookingly engage with the openings in the shoetables S8.
When the end portions 81, 83 are stretched apart the inside diameter of the annular portion 82 will decrease slightly.
The torsional spring 80 may remain on the anchor pin 30 when either of the brake shoes 50, 52 are removed from the brake assembly 10. To remove a brake shoe, one would disconnect the shoe return spring 68. This would allow the brake shoes 50, 52 to pivot in a clam-shell fashion about the anchor pin 30. The torsional retaining spring 80 would be hookingly engaged with each of the shoes 50, 52. Each of the shoes could then be hookingly disengaged from the torsion spring 80 without removing the torsion spring 80 from the anchor pin 30. Such a construction and mounting of the torsion spring 80 allows one of the shoes to be removed without the other shoe falling off.
, . ,,, ~.
When it is desired to actuate brake mechanism 10, the S-cam 24 will be rotated in a counterclockwise direction as viewed in FIG. 1 by actuation of the air chamber, not illustrated, which will effect rotation of the cam shaft 22 in a well-known manner. Counterclockwise rotation of the S-cam 24 will cause the S-cam 24 to engage with the roller pins 64 and effect a pivotal movement in an outward radial direction of the brake shoes 50, 52 about the anchor pin 30.
This will cause the brake pads 60 to engage with a brake drum, not illustrated, in a well-known manner to effect braking of a vehicle associated therewith. When the pressure in the air chamber is released, the return spring means 68 will bias the brake shoes 50, 52 in a radially inwardly direction to rotate the S-cam 24 in a clockwise direction and effect disengagement of the brake pad 60 from the brake drum. During this entire operation the torsional shoe retaining spring 80 will insure that the brake shoes 50, 52 continue to engage the anchor pin 30.
From the foregoing it should be apparent that a new and improved brake assembly for a vehicle has been provided which includes a spider member, a pair of brake shoes, actuating means affixed to one end of the spider member for actuating the brake shoes, anchor pin means supported on the spider member in a position opposite from the one end of the spider member on which the actuating means is secured.
Each of the brake shoes has an anchor pin or one end engaging and pivotable about the anchor pin means and an opposite or S-cam end engaging the actuating means and a web, a shoe table and friction pad means supported on~-the shoetable.
Return spring is provided to interconnect the S-cam ends of the brake shoes for biasing the brake shoes toward a nonactuated position and a shoe retaining torsional spring is provided having a first end connected to the shoetable of one of the brake shoes adjacent the anchor pin end and a second end connected to the shoetable of the other of the brake shoes adjacent the anchor pin end thereof.
substantially annular portion is disposed around the anchor pin means and interconnects the first and second end portions of the torsional spring.
~.
Claims (8)
- Claim 1. A brake assembly for a vehicle comprising a spider member, a pair of brake shoes, actuating means affixed to one end of said spider member for moving said brake shoes in a radial outwardly direction to brake a vehicle associated therewith upon actuation of said actuating means, anchor pin means supported on said spider member in a position opposite from said one end of said spider member on which said actuating means is secured, each of said brake shoes having one end engaging and pivotable about said anchor pin means and an opposite end engaging said actuating means, each of said brake shoes including a web, a shoetable having one side connected to said web and an opposite side, and friction pad means supported on said opposite side of said shoetable, actuation of said actuating means effecting pivotal movement of said brake shoes about said anchor pin means to brake a vehicle associated therewith, return spring means interconnecting said opposite ends of said brake shoes for biasing said brake shoes toward a nonactuated position and a shoe retaining torsional spring, said shoe retaining torsional spring having a first end connected to the shoetable of one of said brake shoes adjacent said one end thereof, a second end connected to the shoetable of the other of said brake shoe adjacent said one end thereof, and a substantially annular portion disposed around said anchor pin means and interconnecting said first and second end portions.
- Claim 2. A brake assembly for a vehicle as defined in Claim 1 wherein said anchor pin means includes a cylindrical anchor pin having a first end and a second end, said first end of said anchor pin being rigidly secured to said spider member to support said anchor pin in a cantilevered fashion.
- Claim 3. A brake assembly as defined in Claim 2 wherein said anchor pin includes a cylindrical portion disposed between said first and second ends and having a first diameter, said second end of said anchor pin including an annular ridge thereon having a second diameter greater than said first diameter of said cylindrical portion of said anchor pin, said annular portion of said shoe retaining torsional spring when disposed around said anchor pin having a diameter slightly larger than said first diameter, said annular ridge normally preventing movement of said shoe retaining torsional spring in a direction parallel to the longitudinal axis of said anchor pin over said annular ridge.
- Claim 4. A brake assembly as defined in Claim 3 wherein said annular portion of said shoe retaining torsional spring is adapted to expand the diameter thereof upon movement of said first and second ends of said shoe retaining torsional spring toward each other to enable said annular portion of said shoe retaining torsional spring to pass over said annular ridge when in an expanded condition.
- Claim 5. A brake assembly as defined in Claim 1 wherein each of said shoetables of each of said brake shoes includes an opening therein disposed adjacent said one end of said brake shoes and said first and second ends of said shoe retaining torsional spring have a hooked configuration, one of said first and second ends of said shoe retaining torsional spring being hooked in said opening disposed in each of said shoetables adjacent said one end of said brake shoes.
- Claim 6. A brake assembly as defined in Claim 3 wherein each of said shoetables of each of said brake shoes includes an opening therein disposed adjacent said one end of said brake shoes and said first and second ends of said shoe retaining torsional spring have a hooked configuration, one of said first and second ends of said shoe retaining torsional spring being hooked in said opening disposed in each of said shoetables adjacent said one end of said brake shoes.
- Claim 7. A brake assembly as defined in Claim 6 wherein said first and second ends of said shoe retaining torsional spring extend from said annular portion of said shoe retaining torsional spring adjacent said one side of said shoetable and through said opening in said shoetable from said one side of said shoetable to said opposite side of said shoetable.
- Claim 8. A brake assembly as defined in Claim 6 wherein said first and second ends of said shoe retaining torsional spring extend from said annular portion of said shoe retaining torsional spring adjacent said opposite side of said shoetable and through said openings in said shoe-table from said opposite side of said shoetable to said one side of said shoetable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US91503878A | 1978-06-12 | 1978-06-12 | |
| US915,038 | 1978-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109810A true CA1109810A (en) | 1981-09-29 |
Family
ID=25435112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA327,692A Expired CA1109810A (en) | 1978-06-12 | 1979-05-16 | Shoe retaining torsional spring for brake assembly |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1109810A (en) |
| MX (1) | MX5360E (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4679667A (en) * | 1985-10-28 | 1987-07-14 | Dana Corporation | Anchor pin retainer |
| CN109210108A (en) * | 2018-11-19 | 2019-01-15 | 江苏三志制动器有限公司 | A kind of graceful rear accurate dual openings casting brake of reinforcement |
-
1979
- 1979-05-16 CA CA327,692A patent/CA1109810A/en not_active Expired
- 1979-06-08 MX MX805679U patent/MX5360E/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4679667A (en) * | 1985-10-28 | 1987-07-14 | Dana Corporation | Anchor pin retainer |
| CN109210108A (en) * | 2018-11-19 | 2019-01-15 | 江苏三志制动器有限公司 | A kind of graceful rear accurate dual openings casting brake of reinforcement |
Also Published As
| Publication number | Publication date |
|---|---|
| MX5360E (en) | 1983-06-29 |
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