Automatically regulated brake drive

专利摘要:
The invention relates to mechanical engineering and can be used in motor vehicle brake actuators with automatic adjustment. The goal is to increase the reliability of operation and the compactness of the structure by ensuring stable relative positioning of the body, piston and doggie. For this, the brake actuator with automatic adjustment of the drum brake contains pistons (P) 4 moving through a wedge and rollers; Claim 4 can be moved by means of nuts and screws separately from the pads. The drive with automatic adjustment has a screw, a nut, an associated gear wheel (GC) 13 and a pawl 14. The pawl l4 is installed to interact with the piston via an axis 15. The free end of the pawl 14 has a curved part 16 with a shape corresponding to the shape of the teeth of the GC 13. The first spring 19 presses the part 16 to the teeth of the AC 13 and is located under the head 17 of the axis 15, having a protrusion for limiting the axial movement of the nut and the cam with the head 17. The head 17 is placed with the possibility of movement in the longitudinal groove 22 of the body i 2 and with the end tact with its walls. The second spring 25 presses the curvilinear part 16 to the stop in the form of a rod 24 or to the housing 2. When the drive is turned off, the axis 15, moving downwards together with the piston, causes part 16 to turn counterclockwise. ZK 13 rotates by a certain number of teeth. The nut rotates, causing the screw to slide out to lengthen. 5 3.P.f-ly, 17 Il. (O CO S
公开号:SU1438625A3
申请号:SU843746301
申请日:1984-05-30
公开日:1988-11-15
发明作者:Карре Жан-Жак；Прессако Пьер
申请人:Сосьете Аноним Д.Б.А. (Фирма)；
IPC主号:

专利说明:

. te

s
,four /
This invention relates to mechanical engineering and can be used in vehicle brake actuators.
The aim of the invention is to increase the reliability and compactness of the structure by ensuring stable relative positioning of the body, piston and dog.
FIG. Figure 1 shows the brake actuator used to adjust the brake drum, a partial section; in fig. 2 is a view A of FIG. one.; | In FIG. 3 is a section bb of fig 2; FIG. 4 is view B of FIG. 2; in fig. 5 - brake drive option; in fig. 6 is a view of FIG. five; in fig. 7 is a section d-d in fig. 6; FIG. 8 is a view E of FIG. 6; in fig. 9 is a view A of FIG. 1, option; in fig. 10- section Ж-Ж in FIG. 9; FIG. 11 is a view; and FIG. 9; in fig. 12 is a view A of FIG. 1, option; in fig. 13 is a section K-K in FIG. 12; in fig. 14 is a view L in FIG. 12; in fig. 15 is a view A of FIG. 1, option; in fig. 16 is a sectional view in FIG. 15; in fig. 17 is a view of H in FIG.
The brake actuator with automatic adjustment of the drum brake shoe (Fig. 1) has brake pads (not shown) mounted for movement from wedge 1. Drive housing 2 has openings 3 in which control pistons 4 are installed, which can move in opposite directions using a wedge. 1 and the rollers 5 acting on the inclined bottoms 6 of the pistons 4 when the wedge 1 moves in the direction of the scientific research institute arrow 7 (Fig. 1). The pistons 4 can be moved with the help of nuts 8 and screws 9 separately from drum brake shoes (not shown). Typically, the end face 10 of the screw 9 has a locking assembly 11, which prevents the screw 9 from rotating relative to the pad (not shown) during operation of the brake, with the result that the screw 9 is able to be screwed in and unscrewed by rotating it manually. In the same way, at the end of the hole 3, a protective cover 12 is installed, located between, housing 2 and screw 9, to protect the internal volume of the drive.
In addition, the brake actuator contains a device for automatic adjustment (Fig. 1-4), having a screw
ten
15
20
25
-

 ,
thirty
35
45
50
55
and a nut 8, a gear wheel 13 connected to the nut 8, and a pawl 14 mounted to interact axially with the control piston 4 via an axis 15 pivotally connected to one of the ends of the pawl 14. The axis 15 is rigidly fixed to the piston four.
The other free end of the pawl 14 has a curvilinear part (cam) 16 having the shape of the teeth of the wheel 13. The portion 16 is pressed elastically to the tooth of the wheel 13 by means of the first spring 19 located under the head 17 of the axis 15 and acting radially on the pawl 1 4.
According to FIG. 3, the axis 15 has a cam 18, allowing the dog to move relative to the cam 18 against the action of the spring 19. In addition, the axis 15 has a protrusion 20, which penetrates into the slot 21 in the form of an annular groove in the nut 8, in order to limit the axial movement of the nut 8 relative to the piston 4 The head 17 of the axis 15 is installed in the longitudinal groove 22 of the housing 2, the diameter of the head 17 is such that the piston 4 and the axis 15 are completely mounted on a circle relative to the housing 2 and can move axially relative to each other along the groove 22 "
The dog 14 has an inclined section 23 located on the side face of the dog 1.4 to resiliently interacting with the forming stationary connection to the body 2 by the rod 24 by means of a second spring 25 which is wound around the nut 8. One end of the second spring 25 is attached to the piston 4, and the other presses the dog 14 to the rod 24. Inclined section 23 in its continuation to the free second end of the dog 14 forms a curvilinear part 16.
The gear wheel 13 is connected to the nut 8 by means of a spring 26, which provides a slight relative rotation between the gear wheel 13 and the nut 8. This makes it possible to prevent damage to the curved part 16 or the teeth of the wheel 13 if the force caused when moving the nut 8 is too much .
According to FIG. 5-8, the brake actuator is hydraulically adjustable and has a chamber 27 connected to a pressure source (not shown). In kame
with
The two springs 28 and 29 move separately. The second spring 30 is recessed in the longitudinal groove 31 so that the curved part 32 of the pawl 33 is pressed to the left (FIG. 6) by the inclined section 34 to the fixed part 35 of the body 36. The spring 30 is held by the head 37 of the axis 38 The direction of the teeth of the dog 33 is opposite to the direction of the teeth of the dog 14.
The brake actuator (figs. 9-11) holds the pawl 39 abutting the rod 40 with the help of the second spring 41 spanning the nut 42. The spring 4 has a crimped end 43 acting as the first spring and pressing the curvilinear part 44 of the pawl 39 radially to the wheel tooth 45 with two sloping surfaces (Fig. 11). A nut 46 (FIG. 10) rests in the bottom of the piston 47 through a sleeve 48 which facilitates the rotation of the nut 46 relative to the piston 47. The nut 46 mates with the screw 49.
The brake actuator (figs. 12-14) contains a pawl 50 interacting on the side of its curvilinear part 51 of the free end with a gear ring 52, which interacts with the teeth of the gear wheel 53, while their teeth are located one opposite the other around the entire circumference and are pressed to the other by means of the first spring 54, located between the piston 55 and the ring 52. One end 56 of the spring 54 is curved and presses the inclined section 57 elastically to the fixed part 58. The spring 54 is also subject to torsional twisting. The clearance adjustment is also carried out by the nut 59.
According to the embodiment of FIG. 15-17, the brake actuator includes a pawl 60 with an inclined section 61 expanding with respect to its free end with a curved part 62. The nut 63 is installed with possibility of engagement with the gear wheel 64 by means of a spring 65. In the drive, the rod 66 is integrated with the housing 67, which prevents the piston 68 from being removed by the head 69 of the axis 70. The rod 66 is made in the form of a screw screwed into the housing 67. In all the described versions, the dogs 14, 33, 39, 30 and 60 are partially in the guides P1) pl, solo grooves 22,
ten
15
25
1 with 2o

thirty
35
40
45
50
55
31, 71, 72, 73 made in the housing 2, 36, 74, 75, 67. Consequently, they are adequately protected, and by performing them in the form of flat plates, reliable operation is ensured.
Brake actuator (Fig. 1-4) works as follows.
When the drive is activated, pressure is applied to the wedge 1 in the direction of arrow 7 (Fig. 1). At this point, a wedge 1 passes between two rollers 5, which on one side rolls over wedge 1, and on the other hand - on the bottom 6 of the pistons 4. Due to their inclination, the pistons 4 move away, p; mon from the other, and run the blocks, (not shown).
Moving the piston 4, for example, to the left (Fig. 1) actuates the device for automatic adjustment. Moving the axis 15 upward (Fig. 2) causes the dog 14 and the gear wheel 13 to move upwards. The dog 14 then rotates clockwise. If axial movement of the axle 4 is sufficient, the part 16 of the pawl 14 passes along the tooth of the wheel 13 and the spring 19 allows the part 16 to remain pressed to the flange of the tooth of the wheel 13 and then jump to another tooth.
When the drive is disconnected, the wedge 1 passes in the opposite direction relative to the arrow 7, parts 4 approach each other under the action of the return spring 1 for the shoes (not shown). This movement of the piston 4 down (figure 2) and the axis 15 causes the rotation of part 16 of the pawl 14 counterclockwise. At this time, the gear wheel 13 is rotated by a certain number of teeth, driving the nut 8, which causes the screw 9 to move, to lengthen.
If the axial stroke of the pistons 4 is not enough to inform the dog 14 of the movement required to pass the tooth, the dog 14 will return to its original position without adjustment. If the axial force on the screw 9 is such that the friction between it and the nut 8 does not allow it to turn, the gear wheel 13 will rotate relative to the housing 2 and relative to the nut 8 also by the same angular value of one tooth, which corresponds to the elastic deformation
26, which causes the nut 8 to pivot when excessive force is applied to the screw 9. The head 17 of the axle 15 guides the piston 4 and the pawl 14, thus determining the relative position of the inclined section 23 and the rod 24. Radial movement of the part 16 is necessary in order to step over the tooth of the wheel 13, which is determined by the shape of the cam 18 (FIG. 3),
The automatic adjustment device can be easily removed without disassembling together with the piston 4 by means of its simple movement, only raised to the protective edge 12.
When the brake actuator of FIG. 5-8, after an increase in pressure in chamber 27, pistons 28 and 29 are extended, moving separately from one another. In doing so, the axis 38 (Fig. 6) moves upwards, the curved portion 32 of the pawl 33 rotates counterclockwise and jumps one tooth.
The brake actuator of FIG. 9-11 works in a similar way, except that, due to the same spring 41, the part 44 of the dog 39 rests radially on the gear wheel 45 and at the same time the dog 39 is rotated by a certain number of teeth of the wheel 45 if the rotational force of the nut 42 is relative. the screw 49 exceeds a certain value depending on the angle of inclination of the teeth of the wheel 45 and the radial force acting on the folded end 43 of the spring 41. This eliminates the need to insert the spring 26 according to the basic version of the drive of FIG. one.
The brake actuator of FIG. 12-14 works in a similar way, except that for jumping onto one tooth, the pawl 50 rotates the gear ring 52, which under the action of the spring 54 can move at an angle relative to the gear wheel 53, i.e. the dog 50 works in conjunction with the toothed ring 52. When the brake is released, the inclined portion 57 actuates the toothed ring 51 and the wheel 53, which causes the nut 59 to rotate, which provides an adjustment to the brake. .
The operation of the brake actuator of FIG. 15-17 differs from the previous versions in that the automatic control device is activated as soon as the brake is actuated due to the widening inclined section 61. Two cases may arise: either the torque of the nut 63 is small and it is driven by the gear wheel 64 or the rotational force of the nut 63 is too large and the spring 65 provides relative movement between the nut 63 and the gear wheel 64. Adjustment occurs when the rotational force of the nut 63 becomes less than the force of the spring 6 5, When the brake is released, the
In the event that the nut 63 is rotated and the axial stroke of the piston 68 is sufficient, the curvilinear part 62 of the pawl 60 jumps over the tooth and a new adjustment is possible as soon as
the brake will be braked.
The fifth version of the brake drive provides a greater control force than the previous one.
for adjustment.

权利要求:
Claims (6)
[1]
1. A self-adjusting brake actuator containing a nut and a screw, a gear connected to the nut and mounted with the control piston in the axial direction of the pawl, one of
the ends of which are pivotally connected
axis, and the free end is pivotally mounted and cooperating by means of a first spring with a gear wheel, characterized in that, in order to increase reliability and compactness of the structure by ensuring relative fixation in the circumferential direction of the housing, piston and doggie, the doggie is spring-loaded to the housing and is made with an inclined section in contact with the housing, the axis is mounted on the piston, and its free end is made in the form of a cam with a head,
movable in a longitudinal groove made in the housing and in contact with its walls.
[2]
2 ,. The drive according to claim 1, characterized in that the end of the axis opposite to the head is located in an annular groove made in the nut,
[3]
3. The actuator according to claim 1, characterized in that the first spring is located in the groove and is mounted on an axis with the springing pawl in the radial direction.
[4]
4. Drive on PP. 1 - 3, about t l and due to the fact that it is equipped with a second spring, made in the form of a flat spring of curvilinear shape, installed at one end on the axis
in the prestressed state between the head of the axis and the piston, and the other end interacting with the intermediate section of the dog in the direction of the contact of its inclined section with the stop.
[5]
5. The actuator according to claim 1, characterized in that the first spring is installed with contact with the end of the piston in a prestressed
state in the circumferential and radial directions and made with a curved end in contact with the free end of the pawl in the radial direction toward the gear and in the direction of the contact of its inclined section with the stop.
[6]
6. Drive Popp. 1-5, differing in the fact that it is provided with a stop rigidly connected with the housing and the gear ring, which is connected elastically and coaxially with the gear wheel 1, the first spring is made in the form of a twist and compression winch spring, one end of which is connected to the control a piston, and the other end is installed with axially contact with the toothed ring and is made with curved section, which is in contact in circumferential and radial directions with the free end of the pawl, and the pawl is installed with contact with the toothed ring.
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US3049192A|1959-07-13|1962-08-14|Kelsey Hayes Co|Automatic brake adjuster|

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GB1069135A|1964-11-12|1967-05-17|Automotive Prod Co Ltd|Improvements in and relating to automatic adjusting devices for disc brakes|

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GB1092686A|1965-03-15|1967-11-29|Heinz Teves|Improvements in or relating to hydraulic brakes|

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FR1447464A|1965-06-21|1966-07-29|Bendix Corp|Automatic adjustment device for drum brake|

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DE2350851B2|1973-10-10|1980-04-24|Basf Ag, 6700 Ludwigshafen|Process for the preparation of aliphatic phosphoric acid monoesters|

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JPS5618132A|1979-07-19|1981-02-20|Akebono Brake Ind Co Ltd|Adjusting device for braking clearance of drum brake|US4623047A|1985-11-15|1986-11-18|Eaton Corporation|Automatic brake adjustment assembly|

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US4878567A|1987-12-22|1989-11-07|Hayes Industrial Brake, Inc.|Brake/locking differential|

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FR2668565B1|1990-10-30|1992-12-24|Bendix Europ Services Tech|AUTOMATICALLY ADJUSTABLE BRAKE MOTOR.|

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JP4000949B2|2002-08-08|2007-10-31|株式会社アドヴィックス|Wedge-operated brake device|

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JP2004125162A|2002-08-08|2004-04-22|Advics:Kk|Wedge operation type disc brake device|

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CN102425629B|2011-10-26|2016-04-20|芜湖众发汽车制动系统有限公司|A kind of hub clearance self-regulation type rear brake cylinder assembly|

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DE102014013868B4|2014-09-24|2019-02-28|Knott Gmbh|Actuation device for an internal shoe brake with automatic adjustment device|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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FR8308975A|FR2547004B1|1983-05-31|1983-05-31|AUTOMATICALLY ADJUSTABLE BRAKE MOTOR|

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