CN111503191A - Piston gap adjusting device and aviation brake device piston - Google Patents
Piston gap adjusting device and aviation brake device piston Download PDFInfo
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- CN111503191A CN111503191A CN202010321660.5A CN202010321660A CN111503191A CN 111503191 A CN111503191 A CN 111503191A CN 202010321660 A CN202010321660 A CN 202010321660A CN 111503191 A CN111503191 A CN 111503191A
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- piston
- assembly
- wedge
- pull rod
- sleeve
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/42—Arrangement or adaptation of brakes
- B64C25/44—Actuating mechanisms
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- 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
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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- 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
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
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- 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
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The embodiment of the invention discloses a piston gap adjusting device and an aviation brake device piston. The wedge block assembly in the piston clearance adjusting device comprises at least three wedge blocks; the sleeve comprises a sleeve body and a sleeve base outside the first end surface of the sleeve body; one end of the pull rod penetrates through the sleeve body, and the wedge block assembly, the thrust seat, the disc spring assembly and the compression screw plug are uniformly distributed in the sleeve body; the wedge block assembly is abutted against the inner wall of the second end face of the sleeve, and the plurality of wedge blocks are uniformly arranged outside the pull rod in a surrounding mode along the circumferential direction of the pull rod; the thrust seat is partially nested outside the wedge block assembly, the disc spring assembly is nested outside the pull rod, and one end surface of the disc spring assembly abuts against the end surface of the thrust seat; one end of the compression screw plug is provided with a concave hole which is used for being nested at one end of the pull rod and abutting against the other end face of the disc spring component. The embodiment of the invention eliminates the influence of the machining precision of the existing automatic clearance adjusting mechanism on the performance of the piston, realizes the clearance adjusting device of the piston, can be repeatedly utilized, reduces the manufacturing cost of parts, and improves the qualification rate and the stability of the pull-out force.
Description
Technical Field
The application relates to but is not limited to the technical field of aviation machinery, and particularly relates to a piston gap adjusting device for an aviation brake wheel and an aviation brake device piston.
Background
In order to improve the stability of the braking performance and the braking sensitivity, the modern aircraft wheel adopts an automatic clearance adjusting mechanism. The functions are as follows: after the aircraft is braked by landing for many times, the distance between the piston and the pressing disc is increased due to the abrasion of the brake disc, and the automatic gap adjusting mechanism can automatically adjust the gap between the piston and the pressing disc to meet the specified requirement.
The automatic gap adjusting mechanism commonly used at home and abroad at present is divided into two types according to the pulling-out force: a spring sleeve type automatic clearance adjusting mechanism (shown in figure 1) and an expansion pipe type automatic clearance adjusting mechanism (shown in figure 3). The pulling-out force of the spring sleeve type automatic clearance adjusting mechanism comes from the radial interference fit between the pull rod and the spring sleeve, and the pulling-out force is greatly influenced by the self rigidity of the spring sleeve, the environmental temperature, the manufacturing error, the lubricating medium, the surface processing quality and the like; because the spring housing part processing route is long, the precision requirement is high, the wrapping force is unstable under the influence of temperature, pulling-out speed and the like, and the problems of low finished product yield, large pulling-out force attenuation and the like exist. The pulling-out force of the expansion pipe type automatic gap adjusting mechanism is derived from the plastic deformation of the expansion pipe, and is greatly influenced by the plastic deformation performance of materials, the manufacturing error of a ball head, a lubricating medium and the surface processing quality; due to the poor batch stability of materials for manufacturing the expansion pipes in China and the defect of one-time use of the expansion pipes, the popularization and the application of the structure are restricted.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a piston gap adjusting device and an aviation brake device piston, so that the influence of the machining precision of the conventional automatic gap adjusting mechanism on the performance of the piston is eliminated, the piston gap adjusting device can be repeatedly used, the manufacturing cost of parts is reduced, and the qualification rate and the stability of pull-out force are improved.
An embodiment of the present invention provides a piston gap adjusting apparatus, including: the device comprises a sleeve, a wedge block assembly, a pull rod, a thrust seat, a disc spring assembly and a compression screw plug, wherein the wedge block assembly comprises at least three wedge blocks;
the sleeve comprises a sleeve body and a sleeve base vertically arranged on the outer side of the first end face of the sleeve body, a second through hole is formed in the second end face, far away from the sleeve base, of the sleeve body, and a first through hole is formed in the sleeve base; one end of the pull rod penetrates through the second through hole of the sleeve body, and the wedge block assembly, the thrust seat, the disc spring assembly and the compression screw plug are uniformly distributed in the sleeve body;
the wedge block assembly abuts against the inner wall of the second end face, and the plurality of wedge blocks are uniformly arranged in a surrounding mode along the circumferential direction of the pull rod and attached to the outer portion of the pull rod; the thrust seat is of a circular ring structure, and the thrust seat part is nested outside the wedge block assembly; the disc spring assembly is nested outside the pull rod, and one end face of the disc spring assembly abuts against the end face of the thrust seat; and one end of the compression screw plug is provided with a concave hole for being nested at one end of the pull rod embedded sleeve and abutting against the other end surface of the disc spring assembly.
Optionally, in the piston gap adjusting device as described above, the wedge assembly includes three wedges, each wedge is arranged at an angle of 115 degrees along the axial direction of the pull rod, and a gap is formed between adjacent wedges.
Optionally, in the piston lash adjuster as described above, the wedge has a right trapezoid shape in cross section along the axial direction of the tie rod, and the acute angle of the right trapezoid is between 80 degrees and 88 degrees.
Optionally, in the piston gap adjusting device as described above, the taper of the inner annular surface of the thrust seat is the same as the taper of the wedge block assembly, and the width of the inner annular surface of the thrust seat nested with the wedge block assembly is two thirds of the width of the thrust seat;
the thrust block is configured to compress the wedge assembly such that the wedge assembly exerts radial pressure on the tie rod.
Optionally, in the piston lash adjuster as described above, a coefficient of friction of the thrust block with the wedge assembly is less than a friction threshold.
Optionally, in the piston lash adjuster as described above, the disc spring assembly is formed by stacking n disc springs in the axial direction of the pull rod, where n is an even number.
Optionally, in the piston gap adjusting device as described above, an inner surface of the first end surface of the sleeve body is provided with an internal thread, and the other end of the compression plug screw is provided with an external thread matching the internal thread;
the compression screw plug is configured to compress the disc spring assembly and provide pre-pressure for the thrust seat.
The embodiment of the invention also provides a piston of an aviation brake device, which comprises: the piston rod comprises a cylinder seat assembly, a piston bushing embedded in the cylinder seat assembly, and a piston embedded in the piston bushing, wherein the piston gap adjusting device is arranged in the piston, a return spring is embedded outside the piston gap adjusting device, and a screw cap is embedded in one end, close to the pull rod handle, of the piston.
According to the piston gap adjusting device and the aviation brake device piston provided by the embodiment of the invention, the precompression force of the disc spring assembly is controlled by adjusting the screwing-in depth of the compression screw plug, so that the thrust block compresses the wedge block assembly; the wedge block assembly is matched with the taper angle of the thrust seat, and the pre-compression force is converted and amplified into radial pressure of the wedge block assembly on the pull rod, so that the pull rod is compressed; when the pull rod slides relative to the wedge block assembly axially, friction force is generated between the pull rod and the wedge block assembly, and the friction force is pulling-out force of the wedge block type piston gap adjusting device in the embodiment of the invention. In addition, the embodiment of the invention adopts the pressing force of the disc spring assembly to generate the pulling-out force, and along with the abrasion amount of the brake disc, the pre-compression amount of the pressing screw plug can be adjusted to adjust the pre-compression force of the spring, so that the pulling-out force of the piston clearance adjusting device is controlled; therefore, the influence of the manufacturing errors of the wedge block assembly, the thrust seat and the spring on the pulling-out force is eliminated, and the rejection rate of parts is greatly reduced. Moreover, the piston gap adjusting device provided by the embodiment of the invention can be repeatedly used, so that the manufacturing cost of parts is obviously reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a spring-sleeve type automatic gap adjusting mechanism in the prior art;
FIG. 2 is a schematic diagram of the spring sleeve type automatic gap adjusting mechanism shown in FIG. 1;
FIG. 3 is a schematic structural diagram of an expanding tube type automatic gap adjusting mechanism in the prior art;
fig. 4 is a schematic structural diagram of a piston gap adjuster according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a wedge assembly of the piston lash adjuster provided in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an aircraft brake piston according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
It has been described in the above background that the currently commonly used automatic gap adjustment mechanisms are classified into two types according to the pull-off force: spring sleeve type automatic gap adjusting mechanism and expansion pipe type automatic gap adjusting mechanism.
Fig. 1 is a schematic structural diagram of a spring sleeve type automatic clearance adjustment mechanism in the prior art, and fig. 2 is a schematic diagram of the spring sleeve type automatic clearance adjustment mechanism shown in fig. 1. The spring sleeve type automatic gap adjusting mechanism shown in fig. 1 may include: the brake disc comprises a cylinder seat assembly 1, a lining 2, a pull rod 3, a return spring 4, a screw cap 5, a sleeve 6, a spring sleeve 7, a support sleeve 8, a piston 9 and a brake disc assembly 10. Fig. 1 shows the initial brake releasing state, fig. 2 shows the brake releasing state when the brake disc is worn, and the working principle of the spring sleeve type automatic clearance adjusting mechanism is as follows: referring to fig. 1 and 2, the "delta" value of the brake disc wear increases the piston stroke after a number of brakes. When the screw cap 5 moves to the value of "b", the screw cap will touch the end surface K of the sleeve 6, and because the thrust of the piston 9 is far greater than the pulling-out force generated by the friction of the interference fit between the spring sleeve 7 and the pull rod 3, the screw cap 5 will push the sleeve 6 to move forward to the value of "delta", and the normal braking after abrasion is ensured. When the brake is released, the piston 9 returns to the value of 'b' because the pulling-out force of the spring sleeve 7 and the pull rod 3 is greater than the pressure of the return spring 4, and the whole piston 9 moves forwards by the value of 'delta'; therefore, the piston 9 moves to a value of 'b' when braking every time, and the purposes of controlling the stroke of the piston 9 and improving the braking sensitivity are achieved.
Fig. 3 is a schematic structural diagram of an expanding tube type automatic gap adjusting mechanism in the prior art. The expanding tube type automatic gap adjusting mechanism shown in fig. 3 may include: the cylinder block assembly comprises a cylinder block assembly 1, a lining 2, a force transmission plate 3, a piston 4, a pull rod 5, an expansion pipe 6, a ball head 7, a nut 8 and a return spring 9. The pulling-out force of the expansion pipe type automatic gap adjusting mechanism is the force which causes the expansion pipe 6 to generate plastic deformation when the bulb 7 moves along the axial direction of the expansion pipe 6 and causes the expansion pipe 6 to generate plastic deformation.
Aiming at the spring sleeve type automatic clearance adjusting mechanism, the problems of low finished product yield, large pull-out force attenuation and the like exist because the processing route of the spring sleeve part is long, the precision requirement is high, and the wrapping force is unstable under the influence of temperature, pull-out speed and the like. Aiming at the expansion pipe type automatic gap adjusting mechanism, the expansion pipe type expansion pipe has the defects of one-time use and restriction on the popularization and application of the structure due to poor batch stability of materials for manufacturing the expansion pipe in China.
In view of the problems of the automatic clearance adjusting mechanisms, the embodiment of the invention provides the wedge type piston clearance adjusting mechanism which can eliminate the influence of machining precision, can be repeatedly used, reduces the manufacturing cost of parts and improves the qualification rate and the stability of the pull-out force.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 4 is a schematic structural diagram of a piston lash adjuster according to an embodiment of the present invention. The piston gap adjusting device provided by the embodiment can comprise: the wedge assembly comprises a sleeve 1, a wedge assembly 3, a pull rod 4, a thrust seat 5, a disc spring assembly 2 and a compression screw plug 6, wherein the wedge assembly 3 comprises at least three wedges.
As shown in fig. 4, the piston gap adjusting device, in an embodiment of the present invention, the sleeve 1 may include a sleeve body and a sleeve base vertically disposed outside a first end surface of the sleeve body, a second end surface of the sleeve body, which is far away from the sleeve base, is provided with a second through hole, and the sleeve base is provided with a first through hole; one end of the pull rod 4 penetrates through a second through hole of the sleeve body, and the wedge block component 3, the thrust seat 5, the disc spring component 2 and the compression screw plug 6 are uniformly distributed in the sleeve body.
In the piston clearance adjusting device provided by the embodiment of the invention, the wedge block assembly 3 is abutted against the inner wall of the second end surface of the sleeve 1, and a plurality of wedge blocks are uniformly arranged around the circumference of the pull rod 4 and are attached to the outer part of the pull rod 4; the thrust seat 5 in the embodiment of the invention is of a circular ring structure, part of the thrust seat 5 is nested outside the wedge block component 3, the disc spring component 2 is nested outside the pull rod 4, and one end face of the disc spring component 2 abuts against the end face of the thrust seat 5; one end of the compression screw plug 6 is provided with a concave hole for being nested at one end of the pull rod 4 embedded in the sleeve 1 and abutting against the other end surface of the disc spring component 2.
In practical applications, the pull rod 4 in the embodiment of the present invention may be a rod structure, for example, a structure formed by laminating a cylindrical section and a plate-shaped portion. The plate-like portion is called a head portion, and has a thickness of, for example, 5 mm; the diameter of the cylindrical section is called as the diameter of the pull rod, and can be set to be 4-6 mm. The connecting area of the cylindrical section and the plate-shaped part is provided with circular arc transition.
Alternatively, the sleeve 1 in the embodiment of the present invention may be a rotating body formed by nesting a large ring and a small ring with a cylinder in sequence. The small ring is arranged at one end of the cylinder for inserting the pull rod 4, the outer diameter of the small ring is the same as the inner diameter of the cylinder, the inner diameter of the small ring is slightly larger than the diameter of the pull rod, and the thickness of the small ring can be 3 mm; the large ring is arranged at the other end of the cylinder, the inner diameter of the large ring is the same as the outer diameter of the cylinder, the outer diameter of the large ring is larger than the outer diameter of the cylinder, and the thickness of the large ring can be 3 mm. The outer diameter of the cylinder is 1-2 mm smaller than the inner diameter of the return spring, and the wall thickness is 1.5 mm. In practical application, the inner surface of the cylinder close to one side of the large circular ring is provided with internal threads with the specification of M12-M15.
Optionally, the disc spring assembly 2 in the embodiment of the present invention is formed by stacking n disc springs in the axial direction of the pull rod 4, where n is an even number. That is, the disc spring assembly 2 is formed by combining single disc spring pieces, and the disc spring pieces can be selected from standard parts, or can be selected from self-made parts by calculation due to the size limitation of the sleeve 1. In one implementation mode, the disc spring combination mode is formed by stacking single disc springs in the same direction, the number of disc springs in each group is n (n is calculated and rounded through the rigidity of the disc spring group), each wedge type piston gap adjusting device can select i groups of disc spring groups according to the size of the sleeve 1 and the requirement of the spring compression amount, i preferably takes even number pairs, and the disc springs are assembled in a positive and negative mode and the small ends of the disc springs are prevented from being used as supporting surfaces as far as possible.
Optionally, fig. 5 is a schematic structural diagram of a wedge assembly in the piston clearance adjusting device according to the embodiment of the present invention. The wedge block assembly 3 in the embodiment of the invention can comprise three wedge blocks distributed along the circumference of the pull rod, the inner cylindrical surface of each wedge block is attached to the cylindrical surface of the pull rod, the axial surrounding angle of each wedge block along the pull rod 4 is 115 degrees, namely each wedge block is a revolving body which rotates by 115 degrees around the axis of the pull rod 4, and a gap is formed between every two adjacent wedge blocks; the wedge has a right-angled trapezoid cross section, and the acute trapezoid angle of the right-angled trapezoid is, for example, 88 to 80 °. Fig. 5 is a sectional view taken along a-a in fig. 4, and fig. 4 shows a structure for detaching the thrust bearing 5.
Alternatively, the taper of the inner annular surface of the thrust block 5 in embodiments of the invention is the same as the taper of the wedge assembly 3 and the width of the nest with the wedge assembly (i.e. the width of contact) may be two thirds of the width of the thrust block 5. The thrust block 5 in the embodiment of the present invention is configured to compress the wedge block assembly 3, so that the wedge block assembly 3 generates radial pressure on the pull rod 4, and the material of the thrust block 5 is selected to consider the friction coefficient with the wedge block as small as possible, so that the friction coefficient between the thrust block 5 and the wedge block assembly 3 is smaller than the friction threshold.
Optionally, in the embodiment of the present invention, an internal thread is disposed on an inner surface of the first end surface of the sleeve body, and an external thread matching the internal thread is disposed on the other end of the compression plug 6; accordingly, the compression screw 6 is configured to compress the disc spring assembly 2 and provide a pre-pressure to the thrust seat 5.
In practical application, the basic shape of the compression screw plug 6 can be a cylinder with external threads; the bottom of the pull rod is provided with a counter bore with an inner hexagonal shape or four corners, the depth of the counter bore is 3-5 mm, and the middle of the pull rod is provided with a through hole with the diameter slightly larger than that of the pull rod; the thread diameter of which is the same as the thread diameter of the sleeve 1. The compression screw plug 6 is used for compressing the disc spring assembly 2 and providing pre-pressure for the thrust seat 5.
According to the piston gap adjusting device provided by the embodiment of the invention, the device can be regarded as a wedge type automatic gap adjusting mechanism according to a pulling-out force generating method, and the precompression force of a disc spring assembly is controlled by adjusting the screwing-in depth of a compression screw plug, so that a thrust seat compresses the wedge assembly; the wedge block assembly is matched with the taper angle of the thrust seat, and the pre-compression force is converted and amplified into radial pressure of the wedge block assembly on the pull rod, so that the pull rod is compressed; when the pull rod slides relative to the wedge block assembly axially, friction force is generated between the pull rod and the wedge block assembly, and the friction force is pulling-out force of the wedge block type piston gap adjusting device in the embodiment of the invention. In addition, the embodiment of the invention adopts the pressing force of the disc spring assembly to generate the pulling-out force, and along with the abrasion amount of the brake disc, the pre-compression amount of the pressing screw plug can be adjusted to adjust the pre-compression force of the spring, so that the pulling-out force of the piston clearance adjusting device is controlled; therefore, the influence of the manufacturing errors of the wedge block assembly, the thrust seat and the spring on the pulling-out force is eliminated, and the rejection rate of parts is greatly reduced. Moreover, the piston gap adjusting device provided by the embodiment of the invention can be repeatedly used, so that the manufacturing cost of parts is obviously reduced.
Based on the piston clearance adjusting device provided by the above embodiment of the present invention, an embodiment of the present invention further provides an aviation brake device piston, and fig. 6 is a schematic structural diagram of the aviation brake device piston provided by the embodiment of the present invention, where the piston may include: the piston rod comprises a cylinder seat assembly (not shown in figure 3), a piston bush 7 nested inside the cylinder seat assembly, and a piston 8 nested inside the piston bush 7, wherein the inside of the piston 8 is provided with a piston gap adjusting device in any one embodiment, the outside of the piston gap adjusting device is nested with a return spring 9, and the end, close to the pull rod handle, of the piston 8 is nested with a screw cap 10.
The following describes in detail the implementation of the piston lash adjuster provided in the embodiment of the present invention with a specific embodiment.
Taking a piston of a braking device of a certain type of airplane wheel as an example, the parameters of the piston are as follows: the inner diameter of the return spring is 17mm, and the pull-off force is 2000N.
In the embodiment, the wall thickness of the sleeve 1 is 2mm, the major diameter of the inner cavity is 12mm, and the minor diameter of the inner cavity is 5.3 mm. The big-end internal thread M12 has the thread depth of 10 mm.
The disc spring assembly 2 is formed by combining and laminating GB-T1972-.
The wedge 3 is made of 45 steel and designed with a cone angle of 3 degrees. 3 blocks are uniformly arranged in the sleeve to wrap the pull rod.
The diameter of the pull rod 4 is 5mm, and the material is copper alloy.
The cone angle of the inner surface of the thrust seat 5 is 3 degrees, and the material is QT 600-3.
The compression screw plug 6 is tapped with a thread M12, and the length of the thread is 7 mm. The diameter of the unthreaded cylindrical surface is 10mm, and the diameter of the lightening hole is 6 mm.
The embodiment considers all friction of the whole clearance adjusting mechanism, the design pre-compression amount is 1mm, and the calculated pre-compression force is 800N, wherein the disc spring friction coefficient is 0.015. The radial pressure of the thrust seat 5 on the wedge block 3 is calculated to be 15184N, wherein the friction coefficient of the thrust seat and the wedge block is 0.1, and the maximum friction force of the wedge block 3 and the pull rod is calculated to be 2277N, namely the friction force is the pull-out force of the wedge block type automatic clearance adjusting mechanism. The pulling-out force of the embodiment is larger than 2000N required by the spring sleeve type gap adjusting mechanism, and the structural size meets the space requirement of the plunger.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A piston lash adjuster, comprising: the device comprises a sleeve, a wedge block assembly, a pull rod, a thrust seat, a disc spring assembly and a compression screw plug, wherein the wedge block assembly comprises at least three wedge blocks;
the sleeve comprises a sleeve body and a sleeve base vertically arranged on the outer side of the first end face of the sleeve body, a second through hole is formed in the second end face, far away from the sleeve base, of the sleeve body, and a first through hole is formed in the sleeve base; one end of the pull rod penetrates through the second through hole of the sleeve body, and the wedge block assembly, the thrust seat, the disc spring assembly and the compression screw plug are uniformly distributed in the sleeve body;
the wedge block assembly abuts against the inner wall of the second end face, and the plurality of wedge blocks are uniformly arranged in a surrounding mode along the circumferential direction of the pull rod and attached to the outer portion of the pull rod; the thrust seat is of a circular ring structure, and the thrust seat part is nested outside the wedge block assembly; the disc spring assembly is nested outside the pull rod, and one end face of the disc spring assembly abuts against the end face of the thrust seat; and one end of the compression screw plug is provided with a concave hole for being nested at one end of the pull rod embedded sleeve and abutting against the other end surface of the disc spring assembly.
2. The piston lash adjuster according to claim 1, wherein the wedge assembly includes three wedges, each wedge angled 115 degrees along an axial circumference of the drawbar, with a clearance between adjacent wedges.
3. The piston lash adjuster according to claim 2, wherein the wedge is right trapezoid in axial cross section along the tie rod, and the acute angle of the right trapezoid is between 80 and 88 degrees.
4. The piston lash adjuster according to claim 1 wherein the taper of the inner annular surface of the thrust block is the same as the taper of the wedge assembly, nesting with the wedge assembly by a width of two thirds of the thrust block width;
the thrust block is configured to compress the wedge assembly such that the wedge assembly exerts radial pressure on the tie rod.
5. The piston lash adjuster device of claim 4, wherein a coefficient of friction of the thrust block with the wedge assembly is less than a friction threshold.
6. The piston gap-adjusting apparatus according to claim 1, wherein the disc spring assembly is formed by stacking n disc springs in an axial direction of the drawbar, and n is an even number.
7. The piston gap adjusting device as claimed in claim 1, wherein the inner surface of the first end surface of the sleeve body is provided with an internal thread, and the other end of the compression plug screw is provided with an external thread matched with the internal thread;
the compression screw plug is configured to compress the disc spring assembly and provide pre-pressure for the thrust seat.
8. An aircraft brake piston, comprising: the piston gap adjusting device comprises a cylinder seat assembly, a piston bushing embedded in the cylinder seat assembly, and a piston embedded in the piston bushing, wherein the piston gap adjusting device as claimed in any one of claims 1 to 7 is arranged in the piston, a return spring is embedded outside the piston gap adjusting device, and a screw cap is embedded in one end, close to the pull rod handle, of the piston.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321660.5A CN111503191A (en) | 2020-04-22 | 2020-04-22 | Piston gap adjusting device and aviation brake device piston |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321660.5A CN111503191A (en) | 2020-04-22 | 2020-04-22 | Piston gap adjusting device and aviation brake device piston |
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| CN111503191A true CN111503191A (en) | 2020-08-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696446A (en) * | 2020-12-30 | 2021-04-23 | 贵州新安航空机械有限责任公司 | Automatic clearance mechanism of transferring of expansion sleeve formula |
| CN113944708A (en) * | 2021-10-17 | 2022-01-18 | 西安航空制动科技有限公司 | Expanding tube type automatic gap-adjusting piston mechanism |
| CN114791022A (en) * | 2022-04-29 | 2022-07-26 | 西安航空制动科技有限公司 | Brake device for electromagnetic ejection |
| CN116292690A (en) * | 2023-05-19 | 2023-06-23 | 临工重机股份有限公司 | Brake with self-adjusting brake clearance and self-adjusting method thereof |
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| RU2401955C1 (en) * | 2009-07-22 | 2010-10-20 | Открытое акционерное общество "Авиационная корпорация "Рубин" | Brake drive with wear compensator |
| CN104061261A (en) * | 2014-05-27 | 2014-09-24 | 西安航空制动科技有限公司 | Automatic interval-adjusting force-restoring mechanism |
| CN106763343A (en) * | 2017-02-17 | 2017-05-31 | 西安航空制动科技有限公司 | A kind of aviation spring shell type automatic gap adjusting piston component |
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| JPH05180252A (en) * | 1991-12-27 | 1993-07-20 | Central Japan Railway Co | Driving gear for multiple disc brake |
| US20020056596A1 (en) * | 1999-12-21 | 2002-05-16 | Stinson Robert A. | Automatic brake clearance adjuster |
| RU2175616C2 (en) * | 2000-01-21 | 2001-11-10 | Открытое акционерное общество Авиационная корпорация "Рубин" | Brake drive with wear adjuster |
| CN201013811Y (en) * | 2007-01-05 | 2008-01-30 | 宁波合力汽车零部件有限公司 | Inter space automatic regulation mechanism of air pressure disk brake |
| RU2401955C1 (en) * | 2009-07-22 | 2010-10-20 | Открытое акционерное общество "Авиационная корпорация "Рубин" | Brake drive with wear compensator |
| CN104061261A (en) * | 2014-05-27 | 2014-09-24 | 西安航空制动科技有限公司 | Automatic interval-adjusting force-restoring mechanism |
| CN106763343A (en) * | 2017-02-17 | 2017-05-31 | 西安航空制动科技有限公司 | A kind of aviation spring shell type automatic gap adjusting piston component |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696446A (en) * | 2020-12-30 | 2021-04-23 | 贵州新安航空机械有限责任公司 | Automatic clearance mechanism of transferring of expansion sleeve formula |
| CN113944708A (en) * | 2021-10-17 | 2022-01-18 | 西安航空制动科技有限公司 | Expanding tube type automatic gap-adjusting piston mechanism |
| CN113944708B (en) * | 2021-10-17 | 2023-08-18 | 西安航空制动科技有限公司 | Automatic gap adjusting piston mechanism of expansion pipe type |
| CN114791022A (en) * | 2022-04-29 | 2022-07-26 | 西安航空制动科技有限公司 | Brake device for electromagnetic ejection |
| CN114791022B (en) * | 2022-04-29 | 2023-06-30 | 西安航空制动科技有限公司 | Braking device for electromagnetic ejection |
| CN116292690A (en) * | 2023-05-19 | 2023-06-23 | 临工重机股份有限公司 | Brake with self-adjusting brake clearance and self-adjusting method thereof |
| CN116292690B (en) * | 2023-05-19 | 2023-07-25 | 临工重机股份有限公司 | Brake with self-adjusting brake clearance and self-adjusting method thereof |
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