• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a shoe drum brake a mechanical actuator for separating adjacent shoe ends includes a lever pivotally connected to a shoe and adapted to act on the other shoe through a strut which is chordal with respect to the axis of the brake. In the off position of brake the lever is held in a first retracted position spaced from a fully retracted position by a back stop. The back stop is adapted to be manipulated externally of the brake to permit the lever to move into the fully retracted position under the influence of pull-off springs whereby the braking clearances are increased.
    公开号:SU735188A3
    申请号:SU701411737
    申请日:1970-02-26
    公开日:1980-05-15
    发明作者:Морис Квиней Кеннет
    申请人:Гирлинг Лимитед (Фирма)；
    IPC主号:
    专利说明:

    I
    The invention relates to the field of mechanical engineering, in particular to drum brakes with internal brake pads.
    Known brakes contain a brake disc on which podgruzhennye pads with friction linings are rotatably mounted. The pads are actuated by the hydraulic cylinder in the case of conventional braking, and in the case of emergency braking they are activated by a pivot arm hinged on one of the pads, which interacts with a spacer installed between the pads, and is controlled by a flexible cable, passing through a hole in the brake disc.
    The purpose of the invention is to facilitate the dismantling of the brake when replacing worn friction linings.
    The goal is achieved by the fact that an additional hole is made in the proposed brake disc, in which a stop is mounted, for example in the form of a cylindrical bushing, which interacts with a pivoting lever.
    FIG. 1 shows a drum brake with inner pads, vertical projection; in fig. 2 is a partial section A-A in FIG. one; in fig. 3 - emphasis, longitudinal section, cut; in fig. 4 - the same, modified form; in fig. 5 - emphasis, made in the form of a telescopic device; in fig. 6 - telescopic device in an intermediate position; in fig. 7 - the same, in the final compressed position; in fig. 8 - telescopic device of a modified design.
    The drum brake with inner pads contains a pair of arcuate pads 1 and 2 carrying friction linings 3 for coupling with a rotary drum (not shown).
    The pads 1, 2 are mounted on a stationary brake disc 4 and, for normal operating braking, are provided for extending their adjacent ends with a double-sided hydraulic cylinder 5 mounted on a brake disc 4 between the two ends of the pads. With their opposite ends, the pads 1 and 2 are hinged on the fixed support 6 attached to the brake disc, which perceives the torque on the pads when braking. In the rest position, the pads are retained {; i) outside the coupling with the drum, the tension springs 7 and 8 are attached to the fins of the pads. For emergency braking or braking at the parking, the brake is mechanically actuated by a mechanical drive. The mechanical drive contains a lever 9 pivotally connected at one end to the edge of the trailed rear pad adjacent to the hydraulic cylinder I via the axis 10 of the hinge. The free end of the lever 9 is connected to the cable 11, which enters the brake through the hole 12 in the brake disc, and at an intermediate point of its length, the lever 9 acts on one end of the strut l3, the other end of which is in contact with the edge of the block 2. To choose the brakes clearances and wear compensation of the friction linings 3, the useful length of the spacer 13 is adjusted by an automatic adjustment device 14. The opposite ends of the spacer 13 have bifurcated sections 15 in contact with the edge of the lever 9 and with the base of the groove 16 in the edge of the blocks and 2 respectively. The lever 9 is held out of the full retraction position by the stop 17 which enters the brake through the hole 18 in the brake disc 4. The inner end of the stop 17 contacts the nearby outer end surface of the support 19, which is made in one piece with the lever 9 and is located at a right angle to the plane leverage. A thickening 20 at the free end of the flexible cable 11 abuts against the surface. The stop 17 may have a modified structure. The stop is a cylindrical sleeve 21 of a stepped diameter, covered at the inner end of a smaller diameter, and at the inner end of a smaller diameter diameter it is closed by a flat end wall 22 perpendicular to the main axis of the sleeve 21. The sleeve 21 is one piece of unchanged length, made from synthetic plastic that can deform. The sleeve 21 has an outwardly protruding annular rib 23 guided through the opening 18 of the brake disc 4. The edge of the opening 18 of the brake disc 4 is clamped between the edge 23 and the shoulder 24 located at some distance from the edge 23 in the direction from the end wall 22 in the place of a step change in diameter sleeve 21 walls. At some distance outward from shoulder 24 and from brake disc 4, if the device is inserted into the brake, in the cylindrical wall of sleeve 21 are provided two diametrically opposed. 25 holes. - When the sleeve 21 is inserted into the brake, the outer end of the flat wall is
    735188 In contact with the support 19, keeping the lever in the first retracted position, some distance from the full retraction position, against the action of the hard springs 7 and 8. This position of the lever 9 determines the braking gaps between the brake linings 3 and the drum in the off position position of the brake, thanks to the swivel 10 Between the lever 9 and the rear block 1 and the strut 13, through which the lever 9 acts on the block 2. When you need to remove the brake drum to replace or check the brake pads 1 and 2, the sleeve 21 is pulled out of the brake The leg drive 4, inserting a rod into the hole 25 in the sleeve wall. In this case, the lever 9 is released, allowing the coal movement around the axis 10 under the action of the tension springs 7 and 8 in the direction of the drum to the full retraction position, thanks to which the brake gaps between the friction linings 3 and the drum increase. In the modified stop (Fig. 4), the end wall 22 is formed by a scratched section 26, occupying about half of its area and inclined relative to the main axis of the sleeve 21, and the remaining section 27 of this wall. Usually, to install the lever 9 into the first position of the withdrawal, the remaining portion of the end wall 22, which is perpendicular to the main axis of the sleeve, enters into contact with the lever. When the sleeve 21 rotates in the brake disk around the main longitudinal axis, the bevelled section 26 comes into contact with the support 19 of the lever 9. As a result, the lever 9 performs an angular movement to the drum to the full retraction position, thereby increasing the gaps between the pads 3 and the drum. The stop shown in FIG. 5-7, is. is a telescopic plug-in device. This device contains a cylindrical sleeve 28, into which a conical nasal thickening 29 is inserted, formed at one end of the core 30, at the other end of which an enlarged head 31 with a diameter larger than the inner diameter of the sleeve, but smaller than its outer diameter and hole 18 is provided. in the brake disc 4. The sleeve. 28 and the piston 30 are made of synthetic plastic, preferably by a molding method. The nasal bulge 29 is separated from the annular rib 32 located in the intermediate part of the piston 30 by a jumper 33 of reduced diameter, which is the working landing area of the piston in the hole formed by the inner annular rib 34, which is made in one piece with the inner surface of the sleeve 28. After using the elasticity of the material of the sleeve 28 and the piston 30, the nasal thickening pushes the vent formed by the edge 34 to permanently connect the piston 30 and the sleeve 28 together with the possibility of a relative axial slide movement in a limited range, determined by the contact of the head 31 with the adjacent end of the sleeve 28 and the contact of the nasal thickening 29 with the edge 34. The end of the sleeve 28, which serves as a stop for the head 31, has a part1 35, whose diameter is reduced and serves as an outer annular groove 36. When the sleeve-28 and the piston 30 are joined together, the stop is placed in the hole 18 of the brake disc, pushing the head 31 through the hole and using a suitable flat tool 37 to push the nearby end of the sleeve 28 through. version until a position is reached in which the edge of the opening 18 of the brake disc 4 takes place in the annular groove 36 (FIG. 7). To increase the useful length of the device inside the brake, the piston. 30 is pushed inwards with respect to the sleeve 28 and with respect to the brake until the nasal thickening 29 comes into contact with the rib 34 (FIG. 5). Thereafter, manually by means of the adjusting device 14 is introduced into contact the support 19 on the lever 9 with the head 31, and then continue the adjustment further, moving the piston 30 in the opposite direction to the outside. This is continued until the required adjustment position is reached, which determines the first position of the chuck 9, in which the head 31 rests on the adjacent inner end of the sleeve 28 and is subjected to a predetermined load from the compression springs 7 and 8, t. E. Required adjusted position ry. The chug 9 in the first retracted position is reached as soon as the piston 30 is not able to extend along the axis from the sleeve inward direction. The piston 30 has a second jumper 38 located on the side of the rib 32 distant from the jumper 31, and the rib 32 is the working seat of the piston in the bore opening 28. Thus, the piston 30 all the time has a direction in the sleeve 28, at least two points located with a certain gap along the axis, thereby preventing the tendency of the piston 30 to tilt or move in the transverse direction relative to the} BUT to either rotate the bushings 28, or to engage in this hole. To replace or check the brake pads, the telescopic support is released from the brake disc and the sleeve 28 and the piston 30 are pulled out through the hole 18 with a pair of pliers or other similar tools. As a result, the lever 9 under the action of the tension springs 7 and 8 makes an angular movement Outward to the full retraction position, whereby the gaps between the pads 1 and 2 and the drum automatically increase. The modified telescopic support shown in FIG. 8, includes a sleeve 39 having a cylindrical through hole .40 of constant diameter, in which an inwardly directed radial rib 41 is provided. The piston 42, which has a length significantly greater than the length of the sleeve 39, contains a cylindrical section intended for operation in the hole 40 and equipped with an enlarged head 43 at one end. At the opposite inner end, the section 44 ends with an inclined step 45 leading to a cylindrical section 46 having a diameter slightly smaller than the internal diameter of the rib 41. At one end of the cylindrical portion 46, there is a nasal thickening 47, the maximum diameter of which is slightly larger than the internal diameter of the rib 41, and between the step 45 and the thickening 47 is a radial edge 48, the maximum diameter of which is equal to the maximum diameter of the nasal thickening 47. The material for the sleeve 39 and the piston 42 serves plastic, and they are predominantly molded. In order to assemble the abutment, the nasal thickening 47 of the piston 42 is inserted into one end of the aperture 40 of the sleeve 39 and the nasal thickening 47 and the edge 48 are pushed using the elasticity of the material of the sleeve 39 and the piston 42 through the edge 41, connecting the piston 42 and the sleeve 39 with the possibility of relative axial sliding movement limited by the contact of the head 43 with the nearby end of the sleeve 39 and the contact between the ribs 48 and 41. The end of the sleeve 39, which serves as a stop for the head 43, has a section 49 with a bevel or with a reduced diameter front groove 50. The diameter of the head 43 is approximately equal to the diameter of the free end of the section 49, which is smaller than the diameter of the hole 18 in the brake disc 4. When the sleeve 39 and the piston 42 are connected together, the stop is installed in the hole of the brake disc 4, pushing the head 43 through the hole 18 to as long as the edge of the opening 18 of the brake disc 4 does not take place in the groove 50. To increase the effective length of the device inside the brake, the piston 42 is pushed inwards relative to the sleeve and the brake until a ridge 48 on the piston 42 comes into contact with the rib rum 41 on the sleeve.
    After that, by means of the adjusting device 14, the support 19 on the lever 9 with the head 43 is brought into contact and this adjustment is continued until the head comes into contact with the inner end of the sleeve, determining the required adjusted position of the lever 9 in the first retracted position.
    .. The O-ring or wetting ring 51 O5 rolls in the cylindrical section 46 of the piston 42 and abuts its opposite ends to the edge 48 and to the adjacent outer end of the sleeve 39. The seal or ring 51 prevents debris or other inbred bodies from the sleeve 39 with its outer end and can bend when moving the surface 42 axially relative to the sleeve 39.
    In all cases, the holes 12 and 18 are located in the brake disc symmetrically, so you can easily swap
    a cable 11 and a defined plug-in device forming an abutment for a drum brake located on the side opposite to the brake.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    A drum brake containing a brake disc on which spring loaded pads with friction linings are pivotally mounted, controlled by a hydraulic mechanism during normal braking or pivotally attached to one of the pads with a pivoting lever with emergency braking, characterized in that, in order to facilitate the dismantling of the brake replacing wear-out friction linings; an additional hole is made in the brake disc, in which an emphasis is mounted, for example, in the form of a cylindrical bushing, which interacts with turning points lever.
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    类似技术:
    公开号 | 公开日 | 专利标题
    US7380644B2|2008-06-03|Disc sliding mechanism
    AU2008213155B2|2011-10-27|A rail vehicle brake slack adjuster
    SU735188A3|1980-05-15|Drum brake
    US5350043A|1994-09-27|Automatic slack adjuster
    US3085663A|1963-04-16|Automatic adjusting device for disc brakes
    US4611691A|1986-09-16|Hydraulic actuator assemblies for vehicle brakes
    EP0070106A1|1983-01-19|Disc brakes
    US2948356A|1960-08-09|Disc brakes and automatic adjusting devices therefor
    US2619198A|1952-11-25|Wear compensating device for vehicle brakes
    US4050548A|1977-09-27|Automatic adjusters for hydraulically operated disc brakes
    US4076105A|1978-02-28|Lever strap for a drum brake
    US6397983B1|2002-06-04|Automatic adjustment for disc brake pad
    US4537293A|1985-08-27|Hydraulic cylinder assemblies
    US3822003A|1974-07-02|Automatic brake adjustment mechanism
    US3871493A|1975-03-18|Shoe drum brakes
    US2873006A|1959-02-10|Brake adjustment mechanism
    US5038898A|1991-08-13|Drum brake
    US2222858A|1940-11-26|Brake
    US2801712A|1957-08-06|Brake deflection compensator
    US3970173A|1976-07-20|Device in a fluid pressure actuated brake unit for enabling the outgoing push rod to be brought back from the outside
    EP0093574A1|1983-11-09|Improvements in disc brakes for vehicles
    US2790515A|1957-04-30|Brake having deflection compensation means therein
    US2904137A|1959-09-15|Self-adjusting wheel brake
    US2414037A|1947-01-07|Automatic brake wear take-up means
    US2347366A|1944-04-25|Internal shoe drum brake
    同族专利:
    公开号 | 公开日
    FR2033147A5|1970-11-27|
    US3666058A|1972-05-30|
    ES377023A1|1972-05-16|
    DE2009328B2|1972-07-27|
    DE2009328A1|1970-12-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU2634854C2|2013-08-16|2017-11-07|Бендикс Спайсер Фаундейшн Брейк Ллк|Brake spider for drum brake and brum brake|US2292017A|1940-09-26|1942-08-04|Thermo Brakes Corp|Brake adjuster|
    US2374536A|1941-11-01|1945-04-24|Bendix Aviat Corp|Brake|
    FR1429791A|1965-04-06|1966-02-25|Girling Ltd|Drum and pad brake improvements|JPS5256185U|1975-10-20|1977-04-22|
    FR2478243B1|1980-03-14|1984-10-19|Dba|
    FR2524591B1|1982-03-30|1984-05-25|Dba|
    US4753325A|1987-10-05|1988-06-28|Babcock Industries Inc.|Parking brake assembly including automatic latching device associated with brake lever and cable, and method of connecting cable thereof|
    JPH0714664Y2|1989-05-16|1995-04-10|曙ブレーキ工業株式会社|Drum brake|
    US5092428A|1989-07-21|1992-03-03|Tokico Ltd.|Drum brake|
    JPH10299801A|1997-04-22|1998-11-13|Nisshinbo Ind Inc|Drum brake device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB5126769A|GB1247245A|1969-03-01|1969-03-01|Improvements in back stops for internal shoe drum brakes and to internal shoe drum brakes incorporating such back stops|
    GB1103269|1969-03-01|
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