CN213017567U - Cam assembly and cam control mechanism of emergency brake - Google Patents
Cam assembly and cam control mechanism of emergency brake Download PDFInfo
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- CN213017567U CN213017567U CN202021333380.8U CN202021333380U CN213017567U CN 213017567 U CN213017567 U CN 213017567U CN 202021333380 U CN202021333380 U CN 202021333380U CN 213017567 U CN213017567 U CN 213017567U
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Abstract
The utility model belongs to the technical field of aircraft brake control, a cam subassembly and cam operating mechanism of emergent brake is disclosed, the cam subassembly includes at least: a cam and a target; the target is fixed on the cam through a screw, and an initial limit table, a first concave circular curved surface, a convex circular curved surface, a second concave circular curved surface and a termination limit table are arranged on the working surface of the cam; the first concave round curved surface and the second concave round curved surface are arranged at two ends of the convex round curved surface; the first concave round curved surface, the convex round curved surface and the second concave round curved surface are smoothly connected, so that the displacement, the speed and the acceleration of the driven part can be strictly changed according to a preset rule, and the cam can convert continuous rotary motion into reciprocating linear motion to realize a complex motion rule.
Description
Technical Field
The utility model belongs to the technical field of aircraft brake control, especially, relate to a cam control mechanism of cam subassembly and emergent brake.
Background
The airplane stop/emergency brake valve is used for emergency, parking and flying line stop, and is composed of a brake pressure reducing valve and an operating mechanism in the function, the brake valve can provide brake pressure for a plurality of airplane wheels at the same time, the operating mechanism is used for driving a brake valve sleeve to move and outputting the brake pressure, and the operating mechanism which is reliable, efficient and accurate determines the working performance of the airplane brake valve to a great extent. The existing airplane shutdown/emergency brake valve operating mechanism mainly comprises a link mechanism, a cam mechanism, a steel cable mechanism and the like, different mechanisms have advantages and disadvantages, and usually one set of independent mechanism controls one independent brake valve, so that the product has a complex structure, large mass, poor reliability and large volume, the relation between the magnitude of brake pressure and the displacement of the operating mechanism and the magnitude of operating force is difficult to accurately control, and the design requirement of a modern advanced airplane cannot be met.
SUMMERY OF THE UTILITY MODEL
For overcoming prior art shut down/emergent brake valve's design defect, the utility model provides a cam operating mechanism of cam pack and emergent brake, brake pressure size becomes gain proportional relation with the cam stroke. In the design requirement of the cam, the motion trail of the cam before the maximum braking pressure is an involute curved surface, and when the maximum braking pressure stroke is reached, the motion trail of the cam is concentric circles, so that the stroke increase of a product can be ensured while the pressure is unchanged, and the smooth locking of a brake handle is realized.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize.
The first technical scheme is as follows:
a cam assembly, the cam assembly comprising at least: a cam and a target knuckle bearing;
the target is fixed on the cam through a screw, and an initial limit table, a first concave round curved surface, a convex round curved surface, a second concave round curved surface and a stop limit table are arranged on the working surface of the cam;
the first concave round curved surface and the second concave round curved surface are arranged at two ends of the convex round curved surface;
the first concave round curved surface, the convex round curved surface and the second concave round curved surface are connected smoothly.
The utility model discloses technical scheme one's characteristics and further improvement do:
(1) the motion trail of the cam is an involute curved surface before the brake pressure provided by the brake valve reaches the maximum brake pressure;
the braking pressure provided by the braking valve is concentric with the movement track of the cam at the maximum braking pressure.
(2) The cam assembly further comprises: the knuckle bearing is arranged at the upper end of the cam and connected with the upper computer through a steel cable.
(3) The lower end of the cam is provided with a bushing mounting hole, and the cam assembly further comprises a bushing;
the bushing is press-fitted in the bushing mounting hole.
(4) The cam is provided with lightening holes, lightening grooves or groove structures.
The second technical scheme is as follows:
a cam operating mechanism of an emergency brake comprises a bracket component, a transmission component and a spring component, and the cam component of the technical scheme I;
the cam assembly is connected with the support assembly in a rotating mode through a flat head shaft, the cam plane is in contact with the flat head shaft installed on the transmission assembly, the cam assembly is connected with one end of a return spring in the spring assembly through a special-shaped screw, and the other end of the return spring is connected with the machine body support.
The utility model discloses technical scheme has adopted cam mechanism to realize the control to brake case, can make the displacement of case, speed and acceleration can change according to control handle displacement law strictly, turn into reciprocating linear motion with continuous rotary motion, when arriving at the biggest brake pressure, the motion trail of cam is the curved surface that gradually bursts at the seams, when reaching the biggest brake pressure stroke, the motion trail of cam is the concentric circles, just so can guarantee that the product stroke increases and pressure is unchangeable, also be favorable to mechanism's lock position.
Drawings
Fig. 1 is a schematic structural diagram of a cam assembly according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of a cam operating mechanism of an emergency brake according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a cam operating mechanism of an emergency brake according to an embodiment of the present invention;
wherein, A-cam, B-target, C-knuckle bearing, D-bush mounting hole, E-lightening hole, lightening groove or groove structure, a-initial limit stage, B-first concave round curved surface, C-convex round curved surface, D-second concave round curved surface, E-termination limit stage, 1-cover plate, 2-spring seat, 3-adjusting screw, 4-groove type nut, 5-mounting plate, 6-flat head shaft, 7-flat head shaft, 8-return spring, 9-cam component, 10-bracket component, 11-transmission component, 12-gasket, 13-cylindrical helical compression spring, 14-hexagonal thin nut, fine tooth, 15-light spring gasket, 16-cylindrical head screw, 17-split pin, 18-washer, 19-plain end shaft, 20-split pin, 21-plain end shaft.
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.
An embodiment of the present invention provides a cam module, as shown in fig. 1, the cam module includes at least: a cam A and a target B;
the target is fixed on the cam through a screw, and an initial limit table a, a first concave round curved surface b, a convex round curved surface c, a second concave round curved surface d and a stop limit table e are arranged on the working surface of the cam;
the first concave round curved surface and the second concave round curved surface are arranged at two ends of the convex round curved surface;
the first concave round curved surface, the convex round curved surface and the second concave round curved surface are connected smoothly.
The motion trail of the cam is an involute curved surface before the brake pressure provided by the brake valve reaches the maximum brake pressure;
the braking pressure provided by the braking valve is concentric with the movement track of the cam at the maximum braking pressure.
The cam assembly further comprises: and the joint bearing C is arranged at the upper end of the cam and is connected with the upper computer through a steel cable.
The lower end of the cam is provided with a bushing mounting hole D, and the cam assembly further comprises a bushing;
the bushing is press-fitted in the bushing mounting hole.
The cam is provided with lightening holes, lightening grooves or groove structures E.
The cam assembly, which is a core assembly of the operating mechanism, is rotatably connected with a bracket assembly 10 through a flat head shaft 7, so that the cam rotates within a designed angle range. When the cam component rotates, the first concave round curved surface b, the convex round curved surface c and the second concave round curved surface d push the valve core of the main valve body to perform three-stage variable gain motion by pushing the adjusting screw 3, so that pressure variable gain output is realized.
The embodiment of the utility model provides a still provide a cam operating mechanism of emergency brake, cam operating mechanism includes bracket component, drive assembly and spring assembly to and foretell cam assembly.
The cam assembly is connected with the support assembly in a rotating mode through a flat head shaft, the cam plane is in contact with the flat head shaft installed on the transmission assembly, the cam assembly is connected with one end of a return spring in the spring assembly through a special-shaped screw, and the other end of the return spring is connected with the machine body support.
Specifically, as shown in fig. 2, the present embodiment is a parking/emergency braking system operating mechanism for a main wheel of a six-wheel train airplane.
Fig. 3 is a side view of fig. 2, and referring to fig. 2 and 3, the operating mechanism is composed of a cover plate 1, a spring seat 2, an adjusting screw 3, a groove-shaped nut 4, a mounting plate 5, a flat head shaft 6, a flat head shaft 7, a return spring 8, a cam assembly 9, a bracket assembly 10, a transmission assembly 11, a gasket 12, a carbon or alloy steel wire cylindrical helical compression spring 13, a hexagonal thin nut, a fine thread 14, a light spring gasket 15, a cylindrical head screw 16 with a safety hole at the head part, a split pin 17, a gasket 18, a flat head shaft 19, a split pin 20 and a flat head shaft 21. The cam assembly consists of a lining, a cam, a target and a joint bearing. The bracket component consists of a bracket and a bushing. The transmission assembly consists of a transmission piece and a bushing.
A cover plate 1 and a support component 10 are fixed on a decompression valve shell through screws and used as a base of an operating mechanism, a spring seat 2 is arranged in a guide hole in the center of the cover plate and used for positioning the direction of a cylindrical helical compression spring 13, the cylindrical helical compression spring 13 is placed in the guide hole in the center of the cover plate, a transmission component 11 is arranged in the guide hole of the cover plate 2, two side wall plates can be placed in guide hole grooves, the mounting direction of the transmission component is noticed, after the mounting is finished, the transmission component can move up and down through the guide hole and can not rotate along the surface of the cover plate, an adjusting screw 3 screwed with a thin thread nut 14 is screwed into threaded holes on two sides of the transmission component, a flat head shaft 6 is arranged on the transmission hole on the transmission component, a cam component 9 is arranged on the support component through a flat head shaft 7, the cam plane is contacted with the flat head shaft arranged on the, the return spring 8 is installed above the bracket component at one end, fixed through a gasket 18, a flat head shaft 19 and a split pin 20, the other end is installed on the flat head shaft 20 on the cam component, the cam component and the bracket are kept at the initial position under the condition of no operating force through the return spring, certain pretightening force is kept, and the mounting plate 5 is fixed on the bracket through a light spring gasket 15 and a cylindrical head screw 16 with a safety hole at the head and is protected against loosening.
In the installation process, the connection assembly part which is easy to generate errors is designed into an error-proof structure. The design of the components ensures that certain structures have significant differences and cannot be mounted to non-specified locations. To prevent incorrect installation, the housing is marked with a distinct mark (P, B, R with a mark) to prevent incorrect installation.
The mechanism has a cam-to-lever ratio of about 1: 10. The force exerted on the cam is transmitted to act on the pressure reducing spring assembly through the push rod, the valve core is further pushed to move, the braking function is achieved, in the early stage of work of a product, along with the movement of the cam, the braking pressure is approximately linearly increased until the maximum braking pressure, the stroke at the moment meets the requirement of the stroke during the maximum braking pressure, the cam continues to move according to concentric circles, the stroke of the product is increased, the braking pressure is kept unchanged until the emergency handle is locked. This technique has been experimentally verified on similar products.
In order to overcome the current design defect of shutting down/emergent brake valve, the embodiment of the utility model provides a cam-type brake valve double-circuit operating mechanism, this operating mechanism can become gain proportional relation through two independent brake relief pressure valves of two-chamber sleeve control, brake pressure size and cam stroke. In the design requirement of the cam, the motion trail of the cam before the maximum braking pressure is an involute curved surface, and when the maximum braking pressure stroke is reached, the motion trail of the cam is concentric circles, so that the stroke increase of a product can be ensured while the pressure is unchanged, and the smooth locking of a brake handle is realized.
Meanwhile, in the structural design, ANSYS finite element analysis software is referred, on the premise of ensuring the strength, the structure optimization design of lightening holes, lightening grooves or grooves is carried out on parts such as cams and supports, the requirement of agreement weight is met, and meanwhile, the production cost of enterprises is reduced. On the premise of meeting the performance and the function, the design is simplified as much as possible, the structure is simple as much as possible, the variety, the specification and the number of mechanical structure parts are reduced, the complexity of the shutdown/emergency brake valve operating mechanism is reduced to the minimum degree, and unreasonable stress and damage to other parts cannot be increased by the part with the simplified design.
The embodiment of the utility model provides an emergent brake operating mechanism of aircraft has realized double-circuit synchro control to the brake valve, through two independent brake relief pressure valves of two-chamber sleeve control for aircraft left and right sides host computer wheel system output brake pressure value is the same, does benefit to and improves brake efficiency and braking system reliability, reduces braking system weight and volume. Through adjusting screw, the initial distance of control drive assembly and brake case that can be effective accurate, and then realize the control to case removal stroke, reuse hexagonal thin nut is fixed adjusting screw, reaches the regulation to the brake stroke. The cam mechanism is adopted to realize the control of the brake valve core, the displacement, the speed and the acceleration of the valve core can be changed strictly according to the displacement rule of the control handle, continuous rotary motion is converted into reciprocating linear motion, when the maximum brake pressure comes, the motion track of the cam is an involute curved surface, and when the maximum brake pressure stroke is reached, the motion track of the cam is a concentric circle, so that the product stroke can be ensured to be increased, the pressure is unchanged, and the mechanism is favorable for locking.
Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. 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 (6)
1. A cam assembly, comprising at least: a cam and a target;
the target is fixed on the cam through a screw, and an initial limit table, a first concave round curved surface, a convex round curved surface, a second concave round curved surface and a stop limit table are arranged on the working surface of the cam;
the first concave round curved surface and the second concave round curved surface are arranged at two ends of the convex round curved surface;
the first concave round curved surface, the convex round curved surface and the second concave round curved surface are connected smoothly.
2. The cam assembly of claim 1,
the motion trail of the cam is an involute curved surface before the brake pressure provided by the brake valve reaches the maximum brake pressure;
the braking pressure provided by the braking valve is concentric with the movement track of the cam at the maximum braking pressure.
3. The cam assembly of claim 1, further comprising: the knuckle bearing is arranged at the upper end of the cam and connected with the upper computer through a steel cable.
4. The cam assembly of claim 1, wherein the lower end of the cam is provided with a bushing mounting hole, the cam assembly further comprising a bushing;
the bushing is press-fitted in the bushing mounting hole.
5. The cam assembly of claim 1, wherein the cam is provided with a relief hole, relief groove, or groove structure.
6. A cam operating mechanism for an emergency brake, wherein the cam operating mechanism comprises a bracket assembly, a transmission assembly and a spring assembly, and the cam assembly of any one of claims 1 to 5;
the cam assembly is connected with the support assembly in a rotating mode through a flat head shaft, the cam plane is in contact with the flat head shaft installed on the transmission assembly, the cam assembly is connected with one end of a return spring in the spring assembly through a special-shaped screw, and the other end of the return spring is connected with the machine body support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021333380.8U CN213017567U (en) | 2020-07-08 | 2020-07-08 | Cam assembly and cam control mechanism of emergency brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021333380.8U CN213017567U (en) | 2020-07-08 | 2020-07-08 | Cam assembly and cam control mechanism of emergency brake |
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| Publication Number | Publication Date |
|---|---|
| CN213017567U true CN213017567U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021333380.8U Active CN213017567U (en) | 2020-07-08 | 2020-07-08 | Cam assembly and cam control mechanism of emergency brake |
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| CN (1) | CN213017567U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114348246A (en) * | 2021-12-17 | 2022-04-15 | 江西洪都航空工业集团有限责任公司 | Automatic brake device for folding undercarriage |
-
2020
- 2020-07-08 CN CN202021333380.8U patent/CN213017567U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114348246A (en) * | 2021-12-17 | 2022-04-15 | 江西洪都航空工业集团有限责任公司 | Automatic brake device for folding undercarriage |
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