CA1093983A - Brake band end connection - Google Patents
Brake band end connectionInfo
- Publication number
- CA1093983A CA1093983A CA320,819A CA320819A CA1093983A CA 1093983 A CA1093983 A CA 1093983A CA 320819 A CA320819 A CA 320819A CA 1093983 A CA1093983 A CA 1093983A
- Authority
- CA
- Canada
- Prior art keywords
- band
- plate portion
- band element
- abutment surface
- tang
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A brake band is provided which is useful par-ticularly in connection with transmissions. The band has welded at each free end thereof a bracket. The brackets are provided with recesses to receive the ac-tuating struts which abut against one end of the re-cesses to cause closing of the band in a drum.
A brake band is provided which is useful par-ticularly in connection with transmissions. The band has welded at each free end thereof a bracket. The brackets are provided with recesses to receive the ac-tuating struts which abut against one end of the re-cesses to cause closing of the band in a drum.
Description
Title: "Brake Band End Connection"
This invention relates to brake bands and refers more particularly to a brake band end connection.
Background of the Invention In the past, brake bands of the type pres~ntlY
contemplated have been in widespread use. One conventional ~rake band design incorporates forged brackets which are butt-welded to the free ends of the band. The brackats have required machining operations. Such bands have been satisfactGry in use. However, they are relativel~ high in cost and there has been a desire to produce a braXe band which is effective in use but of lower cost.
One proposed construction is illustrated in U.S.
pat~nt No. 3,399,749. In this construction, stamped brackets are welded on the outer surfaces adjacent the free ends of the band. A lug is folded upwardly from the material o~ the bracket. This lug forms abutment str~lcture for the actu~ting struts.
Several problems have been encountered with such structures. The upstanding nature o~ the lugs inherently xesults in a bending force being applied to the lugs. This ha~ resulted in failure of lugs during use G~ the band.
Additionally, the resulting lifting ~orce ha~ caus~d, in some cases, separation of the bracket from th~ band a~ th~
weld points. Further, there has been excessive ~oe-in at the ends of the bracket resulting in pr~mhtur~ arinq c~
the frictior, material provided on the working surface of the band.
. . : .:, : ::, , :. : . . .::
~ 3~
In accordance with the present invention a brake band structure is provided incorporating the desirable cost-saving feature of welding brackets to the surface of the free ends of the brake band while at the same time providing a brake band which is as durable and effective in use as previous forged constructions.
The brake band comprises a flexible, arcuate, transversely split friction band element having a pair of free ends normally spaced from one another. Means on the band element are adapted to be engaged by actuating means to contract the band element, said means including a brac~et secured to the radially outer surface of the band element adjacent one of the free ends thereof. The bracket has a plate portion disposed in surface-to-surface contact with the radially outer surface of the band element and has an end adjacent said one free end of the band element.
~ The plate portion has a marginal edge projecting radially ; outwardly from the outer surface of the band element to the outer surface of the plate portion, the marginal edge extending transversely of the band element and facing away from said one free end of the band element to provide an abutment surface for the actuating means. The plate portion has an integral tang bent up from the plate portion at a point between the abutment surface and said end of said . 25 plate portion. The tang has a locator portion extending `" beyond the abutment surface to its free end in a direction away from said end of the plate portion, said locator portion being spaced from the outer surface of the band element a ~ distance equal to or greater than the radial extent of the i~ 30 abutment surface. The locator portion and the outer surface ` of the band element serves to locate the actuating means when . .
:-` in contact with the abutment surface.
:
, ... . .
t~
;:
3~3 Brief Description of ihe Drawings . _ _ Figure 1 is a plan view of a brake band in accordance with one em~Gdiment of the present invention;
Figure 2 is a side elevational view of the band of Figure 1 illustratively mounted on a drum with the actuating struts in place;
Figure 3 is an enlarged view of the upper left hand bracket of Figure 2; and Figure 4 is a plan view of a modified bracket construction.
Detailed Description Referring to Figures 1-3, the brake band 10 com-prises an annular band 12 and free ends 14,16. The band normally flexes outwardly leaving a gap between the free ends. The band 12 may be fabricated from conventional carbon steels. A layer of friction material 18 is ad-hered to the inner surface of the band 12. As will be noted in Figure 2, the band is normally received on a cir-cular drum 20. In operation, when the free ends 14,16 of the band are forced towards each other, by means of struts 22,24, the brake material 18 engages the drum 20 causing the drum to stop rotatin~.
A bracket 26,28 comprises essentially plate portions which are secured to the outer surface or the 25 band 12 adjacent the free ends 14,16 as by welding at 30,32 so that the plate portions lie entirely on the band 12. One of the brackets 26 receives the apply strut 22.
This strut 22 is selectively actuated by means (not shown) :, .
- , , . ........... ...... , . ~ : .... ~ .
~ .. ..
3~
., to cause tightening of the band on the drum. The anchor strut 24 is received on the other bracket 28. The anchor strut 24 is fixedly mounted in structure (not shown).
Each of the brackets is provided with a recess 34, 36. The surface portions 38,40 define abutment surfaces for line contact engagement with the rounded ends 42,4~
of the struts. As will be noted, the surface portions 38, 40 are transverse surfaces of the thickness of the plate portions and are thus upstanding integral abutment surface portions extending directly from the band 12 and transverse thereof. Upstanding locator elements 46,48 are struck from the material of each bracket and thus are physically sep-arate from the abutment surface portions 38,40 and out of alignment therewith. The function of these elements is to guide these struts into contact with surfaces 38,40 and to prevent escape of the struts radially outwardly from the brackets when no force is applied to the struts.
As will be appreciated, particularly as viewed in Figure 3, the end 42 of the strut 22 is in substantially line contact with the discontinuous surface 38. This results in the desired action of the applied force being substantially tangential to the radius of the drum 20.
Further, as will be noted, the strut 22 lies against the outer surface of the band 12 without intervening material comprised of the thickness of the bracket. This results in a reduced turning moment with respect to the drum sux-face and thus reduces toe-in of the ends of the brake band towards the drum surface. Reduced toe-in results in less wear of the friction material. Also, as a consequence of the strut 22 bearing directly against the discontinuous surface 38, there is no bending moment attributable to the bracket 26 which could further aggravate the toe-in prob-lem.
,, : - , ;: . - . .: ,, ~ , :;. : : ~ - :
` 10~39~33 Operation of the bracket 28 and anchor strut is substantially the same as above-described.
Figure 4 illustrates a modified form of the brackets. In Figure 4, the bracket 50 i5 provided with a recess 52 in which the abutting surface 54 is in the center of the recess with the pair of locators 56,-58 being located adjacent thereto. As will be noted, the abutment surface 54 is curved as opposed to the straight surfaces previously described. Such a curved surface 1~ works in a manner comparable to a straight surface, the `~
exact configuration of this surface not appearing to seriously affect operation of the bands.
This invention relates to brake bands and refers more particularly to a brake band end connection.
Background of the Invention In the past, brake bands of the type pres~ntlY
contemplated have been in widespread use. One conventional ~rake band design incorporates forged brackets which are butt-welded to the free ends of the band. The brackats have required machining operations. Such bands have been satisfactGry in use. However, they are relativel~ high in cost and there has been a desire to produce a braXe band which is effective in use but of lower cost.
One proposed construction is illustrated in U.S.
pat~nt No. 3,399,749. In this construction, stamped brackets are welded on the outer surfaces adjacent the free ends of the band. A lug is folded upwardly from the material o~ the bracket. This lug forms abutment str~lcture for the actu~ting struts.
Several problems have been encountered with such structures. The upstanding nature o~ the lugs inherently xesults in a bending force being applied to the lugs. This ha~ resulted in failure of lugs during use G~ the band.
Additionally, the resulting lifting ~orce ha~ caus~d, in some cases, separation of the bracket from th~ band a~ th~
weld points. Further, there has been excessive ~oe-in at the ends of the bracket resulting in pr~mhtur~ arinq c~
the frictior, material provided on the working surface of the band.
. . : .:, : ::, , :. : . . .::
~ 3~
In accordance with the present invention a brake band structure is provided incorporating the desirable cost-saving feature of welding brackets to the surface of the free ends of the brake band while at the same time providing a brake band which is as durable and effective in use as previous forged constructions.
The brake band comprises a flexible, arcuate, transversely split friction band element having a pair of free ends normally spaced from one another. Means on the band element are adapted to be engaged by actuating means to contract the band element, said means including a brac~et secured to the radially outer surface of the band element adjacent one of the free ends thereof. The bracket has a plate portion disposed in surface-to-surface contact with the radially outer surface of the band element and has an end adjacent said one free end of the band element.
~ The plate portion has a marginal edge projecting radially ; outwardly from the outer surface of the band element to the outer surface of the plate portion, the marginal edge extending transversely of the band element and facing away from said one free end of the band element to provide an abutment surface for the actuating means. The plate portion has an integral tang bent up from the plate portion at a point between the abutment surface and said end of said . 25 plate portion. The tang has a locator portion extending `" beyond the abutment surface to its free end in a direction away from said end of the plate portion, said locator portion being spaced from the outer surface of the band element a ~ distance equal to or greater than the radial extent of the i~ 30 abutment surface. The locator portion and the outer surface ` of the band element serves to locate the actuating means when . .
:-` in contact with the abutment surface.
:
, ... . .
t~
;:
3~3 Brief Description of ihe Drawings . _ _ Figure 1 is a plan view of a brake band in accordance with one em~Gdiment of the present invention;
Figure 2 is a side elevational view of the band of Figure 1 illustratively mounted on a drum with the actuating struts in place;
Figure 3 is an enlarged view of the upper left hand bracket of Figure 2; and Figure 4 is a plan view of a modified bracket construction.
Detailed Description Referring to Figures 1-3, the brake band 10 com-prises an annular band 12 and free ends 14,16. The band normally flexes outwardly leaving a gap between the free ends. The band 12 may be fabricated from conventional carbon steels. A layer of friction material 18 is ad-hered to the inner surface of the band 12. As will be noted in Figure 2, the band is normally received on a cir-cular drum 20. In operation, when the free ends 14,16 of the band are forced towards each other, by means of struts 22,24, the brake material 18 engages the drum 20 causing the drum to stop rotatin~.
A bracket 26,28 comprises essentially plate portions which are secured to the outer surface or the 25 band 12 adjacent the free ends 14,16 as by welding at 30,32 so that the plate portions lie entirely on the band 12. One of the brackets 26 receives the apply strut 22.
This strut 22 is selectively actuated by means (not shown) :, .
- , , . ........... ...... , . ~ : .... ~ .
~ .. ..
3~
., to cause tightening of the band on the drum. The anchor strut 24 is received on the other bracket 28. The anchor strut 24 is fixedly mounted in structure (not shown).
Each of the brackets is provided with a recess 34, 36. The surface portions 38,40 define abutment surfaces for line contact engagement with the rounded ends 42,4~
of the struts. As will be noted, the surface portions 38, 40 are transverse surfaces of the thickness of the plate portions and are thus upstanding integral abutment surface portions extending directly from the band 12 and transverse thereof. Upstanding locator elements 46,48 are struck from the material of each bracket and thus are physically sep-arate from the abutment surface portions 38,40 and out of alignment therewith. The function of these elements is to guide these struts into contact with surfaces 38,40 and to prevent escape of the struts radially outwardly from the brackets when no force is applied to the struts.
As will be appreciated, particularly as viewed in Figure 3, the end 42 of the strut 22 is in substantially line contact with the discontinuous surface 38. This results in the desired action of the applied force being substantially tangential to the radius of the drum 20.
Further, as will be noted, the strut 22 lies against the outer surface of the band 12 without intervening material comprised of the thickness of the bracket. This results in a reduced turning moment with respect to the drum sux-face and thus reduces toe-in of the ends of the brake band towards the drum surface. Reduced toe-in results in less wear of the friction material. Also, as a consequence of the strut 22 bearing directly against the discontinuous surface 38, there is no bending moment attributable to the bracket 26 which could further aggravate the toe-in prob-lem.
,, : - , ;: . - . .: ,, ~ , :;. : : ~ - :
` 10~39~33 Operation of the bracket 28 and anchor strut is substantially the same as above-described.
Figure 4 illustrates a modified form of the brackets. In Figure 4, the bracket 50 i5 provided with a recess 52 in which the abutting surface 54 is in the center of the recess with the pair of locators 56,-58 being located adjacent thereto. As will be noted, the abutment surface 54 is curved as opposed to the straight surfaces previously described. Such a curved surface 1~ works in a manner comparable to a straight surface, the `~
exact configuration of this surface not appearing to seriously affect operation of the bands.
Claims (5)
1. A brake band comprising a flexible, arcuate, transversely split friction band element having a pair of free ends normally spaced from one another, means on said band element adapted to be engaged by actuating means to contract said band element, said means including a bracket secured to the radially outer surface of said band element adjacent one of said free ends thereof, said bracket having a plate portion disposed in surface-to-surface contact with said radially outer surface of said band element and having an end adjacent said one free end of said band element, said plate portion having a marginal edge projecting radially outwardly from said outer surface of said band element to the outer surface of said plate portion, said marginal edge extending transversely of said band element and facing away from said one free end of said band element to provide an abutment surface for said actuating means, said plate portion having an integral tang bent up from said plate portion at a point between said abutment surface and said end of said plate portion, said tang having a locator portion extending beyond said abutment surface to its free end in a direction away from said end of said plate portion, said locator portion being spaced from said outer surface of said band element a distance equal to or greater than the radial extent of said abutment surface, said locator portion and said outer surface of said band element serving to locate said actuating means when in contact with said abutment surface.
2. A brake band as defined in Claim l, wherein said abutment surface comprises two laterally spaced sur-vace portions separated by said tang which is disposed centrally therebetween.
3. A brake band as defined in Claim 1, wherein said tang comprises two laterally spaced tang portions separated by said abutment surface which is disposed centrally therebetween.
4. A brake band as defined in Claim 1, including means for limiting transverse movement of said actuating means, comprising a marginal edge of said plate portion disposed at each side of said abutment surface and ex-tending in a direction away from said end of said plate portion.
5. A brake band as defined in Claim 1, wherein said plate portion has a part extending beyond said abut-ment surface in a direction away from said end of said plate portion which part is secured to said band element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA320,819A CA1093983A (en) | 1979-02-05 | 1979-02-05 | Brake band end connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA320,819A CA1093983A (en) | 1979-02-05 | 1979-02-05 | Brake band end connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1093983A true CA1093983A (en) | 1981-01-20 |
Family
ID=4113454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA320,819A Expired CA1093983A (en) | 1979-02-05 | 1979-02-05 | Brake band end connection |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1093983A (en) |
-
1979
- 1979-02-05 CA CA320,819A patent/CA1093983A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |