CN201836290U - Friction damping device - Google Patents

Abstract

The utility mode discloses a friction damping device which is characterized in that bosses which are distributed circumferentially are arranged on a supporting plate made of metal material, grooves which are distributed circumferentially are arranged on a friction ring made of carbon/carbon composite material, and an integral composite friction ring is formed by bonding the friction ring and the supporting plate; countersunk holes which are distributed circumferentially are arranged on the composite friction ring, two ends of the countersunk hole are cylindrical sections and the middle is a countersunk section; a pretightening screw sequentially consists of a threaded section, a cylindrical section and a countersunk section, the outer diameter of the threaded section is less than that of the cylindrical section, and the threaded section and the cylindrical section form a limit step; the composite friction ring is arranged on a mounting base by the pretightening screw, and a compression spring is arranged on the mounting base and provides axial pressure for the composite friction ring. The friction damping device can effectively eliminate shaking of a rudder sheet when a steering engine returns to zero position. The friction damping device has the advantages that the friction performance is stable, the generated friction redundancy is less, the high-temperature resistance is good and the manufacturing process is simple.

Description

A kind of friction damping device

Technical field

The utility model belongs to the rudder system technical field of structures, is specially a kind of anti-shake friction damping device of steering wheel that is used for.

Background technique

Traditional rudder system structure is made up of steering wheel, rudder sheet and rudder transmission system, and the rudder transmission system is converted to the rotation of steering wheel the execution action of rudder sheet.Usually the rudder sheet all is in load condition, and the rudder sheet overcomes load and promotes the main body motion.Big and when being in the operating mode of little load when rudder sheet rotary inertia, phenomenon that the rudder sheet is shaken back and forth but appears in steering wheel easily when switch on back zero-bit, and this also may influence effective execution and move not only bad for the accurate control of sheet position, cabin.In order to eliminate the shake of steering wheel, the general employing adjusted steering wheel potentiometer magnification factor or increased the method for damping at the output terminal of steering wheel, so just greatly reduces the performance of steering wheel.

Summary of the invention

The purpose of this utility model is to provide a kind of friction damping device, and this device can be eliminated the shake that steering wheel returns zero-bit under the prerequisite of the less steering wheel performance of loss.

The friction damping device that the utility model provides, it is characterized in that, the dunnage that is formed by metal material processing is provided with the uniform boss of hoop, the friction ring that is processed by the charcoal carbon composite is provided with the uniform groove of hoop, the boss of dunnage embeds the groove of friction ring when bonding, constitute the compound friction ring of an integral body; Have the uniform counter sink of hoop on the compound friction ring, the counter sink two ends are that cylindrical section, centre are the countersunk head section; The pretension screw is made up of thread section, cylindrical section and countersunk head section successively, and the external diameter of thread section makes thread section and cylindrical section form a spacing ladder less than the external diameter of cylindrical section; The compound friction ring is installed on fitting seat by the pretension screw, and arranges that on fitting seat promising compound friction ring provides the pressure spring of axial pressure.

The utility model is eliminated the shake that steering wheel returns zero-bit by add a kind of friction damping device in the drive mechanism of steering wheel and rudder sheet under the prerequisite of the less steering wheel performance of loss.Its technique effect is embodied in: pretension screw of the present utility model plays fixation to the compound friction ring before the rotor assembling, simultaneously pressure spring is realized precompression, the pretension screw just plays the effect spacing to the compound friction ring when fitting seat and rotor relatively rotate; Pressure spring provides axial pressure for the compound friction ring, adjust the size of axial pressure by the quantity of adjusting pressure spring, thereby realize adjusting the size of friction torque, pressure spring also plays balanced action simultaneously, and compound friction ring and rotor are fitted fully; Because a pair of revolute pair that fitting seat and rotor are steering wheel in the drive mechanism of rudder, when steering wheel rotated, the compound friction ring produced with rotor and rubs, thereby for the steering wheel transmission system provides frictional resistance moment, to reach the effect that the elimination steering wheel is shaken.

Description of drawings

The structural representation of the friction damping device that Fig. 1 provides for the utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is an assembling schematic representation of the present utility model;

Fig. 4 is the structural representation of pretension screw.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As shown in Figures 1 to 4, the friction damping device that provides of the utility model comprises dunnage 1, friction ring 2, pressure spring 6 and pretension screw 7.

Dunnage 1 is formed by metal material processing, is the supporting surface that directly contacts with pressure spring 6; Friction ring 2 is processed by the charcoal carbon composite, with rotor 8 relative friction takes place; Dunnage 1 adopts the bonding as a whole compound friction ring of binder with friction ring 2; Dunnage 1 is provided with the uniform boss of several hoops 3, the shearing force when being used to bear the friction ring rotation; Described friction ring 2 is provided with the uniform groove of several hoops, and the quantity of boss 3 and groove equates, the height of boss 3 is identical with the degree of depth of groove, the groove of the boss of dunnage 1 embedding friction ring 2 when bonding.The height of boss 3, the relation between the quantity are as described in the following formula (I).

$h=\frac{M\·{\mathrm{\τ}}^{\′}}{[(D-d)/2+d]\·\mathrm{\λ}}---\left(I\right)$

Wherein M is the frictional resistance moment of friction damping device, and D is a compound friction ring external diameter, and d is a compound friction ring internal diameter, and τ ' is the shear strength allowable of charcoal carbon composite, and λ is a boss quantity.

Have the uniform counter sink of several hoops 4 on the compound friction ring, be used to install pretension screw 7.Counter sink 4 two ends are that cylindrical section, centre are the countersunk head section; Fitting seat 5 is used to install the compound friction ring, and the compound friction ring is installed on fitting seat 5 by pretension screw 7 during assembling, and arranges pressure spring 6 on fitting seat 5, and pressure spring 6 provides axial pressure for the compound friction ring; Rotor 8 in compound friction ring and the steering wheel slewing gear constitutes a pair of revolute pair.

The quantity of pressure spring 6 and specification are determined according to required frictional resistance moment; After assembling, the screw head of pretension screw 7 should be lower than the rubbing surface 1mm～2mm of friction ring 2, interferes to prevent friction pair screw head of rotor 8 and pretension screw 7 in movement process; Pretension screw 7 is made up of thread section 71, cylindrical section 72 and countersunk head section 73 successively, and the external diameter of thread section should make thread section and cylindrical section form a spacing ladder less than the external diameter of cylindrical section.

Described rotor 8 is metal or nonmetal structure spare, and its planeness is not more than 0.1 μ m, and surface roughness is not more than 3.2 μ m.

The internal diameter of described dunnage 1 and friction ring 2 determines that according to the transmission part size of passing its center its internal diameter gets final product than the big 3mm～5mm of the transmission part turning radius; The external diameter of described dunnage 1 and friction ring 2 equals the turning radius of rotor 8; When no transmission part passed dunnage 1 and friction ring 2, it was 0 disc that dunnage 1 and friction ring 2 can be made as internal diameter.

Relation between the stiffness K of described pressure spring 6, quantity n and the required frictional resistance moment is suc as formula (II):

$K=\frac{M}{n\·[(D-d)/2+d]\·\mathrm{\α}}$ Formula (II)

Wherein M is the frictional resistance moment of friction damping device, and D is a compound friction ring external diameter, and d is a compound friction ring internal diameter, and n is a number of springs, and α is spring deflection (amount of deformation that refers to spring when rotor is in place).

The relation of the shear strength τ of described dunnage 1, pretension screw number m is suc as formula (III):

$\mathrm{\τ}\≥\frac{K\·{\mathrm{\α}}^{\′}\·n}{(D-d)\·\mathrm{\δ}\·m}\·\mathrm{\γ}\·\mathrm{\ξ}$ Formula (III)

Wherein K is the rigidity of pressure spring, α ' is spring predeformation amount (amount of deformation that refers to spring when the compound friction ring is in place by the pretension screw), n is a number of springs, D is a compound friction ring external diameter, d is a compound friction ring internal diameter, and δ is a dunnage thickness, and m is the pretension screw number, γ is the stiffness coefficient (generally getting 4～5) of dunnage, and ξ is the safety coefficient (generally getting 2.0～3.0) of dunnage.

The quantity n of described pressure spring 6 is determined by following formula IV:

$n=\frac{M}{K\·[(D-d)/2+d]\·\mathrm{\α}\·f}$ Formula IV

Wherein M is the frictional resistance moment of friction damping device, and D is a compound friction ring external diameter, and d is a compound friction ring internal diameter, and α is a spring deflection, and K is the pressure spring stiffness coefficient, and f is the friction factor of charcoal carbon composite and rotor 8.

During assembling, pretension screw 7 should be screwed onto cylindrical section, and several screw should evenly be screwed into, to prevent that pressure spring 6 from being pressed partially.

The utility model is applicable to the damping structure of steering wheel transmission system, and is not suitable for brake structures such as automobile.

Claims (1)

1. friction damping device, it is characterized in that, the dunnage (1) that is formed by metal material processing is provided with the uniform boss of hoop (3), the friction ring (2) that is processed by the charcoal carbon composite is provided with the uniform groove of hoop, the boss of dunnage (1) embeds the groove of friction ring (2) when bonding, constitute the compound friction ring of an integral body; Have the uniform counter sink of hoop (4) on the compound friction ring, counter sink (4) two ends are that cylindrical section, centre are the countersunk head section; Pretension screw (7) is made up of thread section (71), cylindrical section (72) and countersunk head section (73) successively, and the external diameter of thread section makes thread section and cylindrical section form a spacing ladder less than the external diameter of cylindrical section; The compound friction ring is installed on fitting seat (5) by pretension screw (7), and goes up the pressure spring (6) that the promising compound friction ring of layout provides axial pressure at fitting seat (5).

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