A kind of used in new energy vehicles electromagnetic type reduction drags the device of torque
Technical field
The utility model relates to a kind of newly energy Vehicular devices, and in particular to a kind of to reduce the device for dragging torque.
Background technique
Ventional disc brake, dragging torque is always the problem of perplexing main engine plants, and when the torque is excessive, consumption vehicle is dynamic
Can, it causes to continue a journey undesirable.In electric vehicle, because more sensitive to continuing a journey, whether reasonable, more important if dragging torque.
When normal brake application, oil liquid is pressed into inside and outside two wheel cylinder, and two brake block are compressed under hydraulic action and made by piston
Moving plate generates moment of friction and brakes.At this point, effect of the sword side of the rubber rectangular ring in wheel cylinder slot in piston friction power
It is lower to generate micro flexible deformation.When loosening braking, piston and brake block are by the elastic force of sealing ring and the elastic force return of spring.
Since rectangular seal sword side deflection is very small, when not braking, the every side in gap between friction plate and disk only has 0.1mm left
The right side, it is enough to ensure that the releasing of braking.When again because of brake disc expanded by heating, thickness only has micro variation, therefore will not occur
" support is stagnant " phenomenon.Rubber rectangular ring also acts as the work of piston return and automatic regulating gap in addition to sealing
With.If the friction plate of brake block and the gap wear of disk increase, after sealed ring deformation reaches capacity when braking, piston still can be after
Continuous movement, until friction plate compresses brake disc.After releasing braking, the distance that rubber rectangular ring pushes back piston is the same as mill
It is identical before damage, still keep standard value.
Drag torque it is larger when, when driver release brake when, relax brake pedal, but wheel drag is still whole
Or part is in on-position, cannot release the phenomenon that braking rapidly.It will lead to brake drum [disk] fever, running resistance increases.
Existing brake drags torque solution, mostly uses the mode for increasing return bracket or rectangular loop rigidity, though
It can so alleviate to a certain extent and drag, but because of reasons in structure, can not really solve the problems, such as this.
Summary of the invention
The main inventive purpose of the utility model is desirable to drag torque using suitable device always in design shape
Under state.
Technical solution used in the utility model is: a kind of used in new energy vehicles electromagnetic type reduction drags the device of torque, packet
Include EPB electronic parking system, friction plate, brake disc, caliper bracket, master cylinder.Brake disc and caliper bracket are connected, and the two of brake disc
Side is respectively provided with a friction plate.It further include ranging group, ranging group is equipped with rangefinder, pedestal, magnet, coil.Friction plate is close to system
The distance between the left end of the part of Moving plate and right end are less than between the left end and right both ends of part of the friction plate far from brake disc
Distance and form a step or two symmetrical steps.The stepped portions of the friction plate of this side of master cylinder are equipped with a ranging
Group;Pedestal and caliper bracket are connected.Rangefinder, magnet, coil are equal to be connected with pedestal.Wherein rangefinder is close to corresponding braking
Disk, magnet is between rangefinder and coil.
The utility model increases ranging group on the basis of traditional EPB system and works by following principle:
For vehicle in normal brake application, rangefinder monitors pedestal to the distance L of brake disc, and in this, as gauged distance,
After vehicle braking releases, rangefinder obtain pedestal at this time to the distance L1 of brake disc,
When ± 0.1 L1 >=L+0.2, gap is normal, drags torque in the normal range, the utility model does not work;
As L1 < L+0.2 ± 0.1, coil is powered, and generates magnetic force, repels each other with magnetic pole, and then pushes friction plate far from system
Moving plate drags torque to reduce;
It is so ensured that using the utility model and drags torque always in design point.
Preferably, further including having shield, the shield and caliper bracket are fixed together, and the shield is located at caliper branch
Frame is close to the side of friction plate, and further low preferential, the outer rim of shield is equipped with the bending part to caliper bracket.This preferred embodiment,
Be conducive to improve
Preferably, axis of the rangefinder close to master cylinder.The work that this preferred embodiment is conducive to improve the utility model can
By property.
In conclusion utilizing the beneficial effects of the utility model are: the utility model overall structure is simple, reliable operation
The utility model can guarantee to drag torque always in design point, therefore the utility model is very outstanding technical solution.
Detailed description of the invention
Fig. 1: the structural schematic diagram of the utility model;
Fig. 2: the A-A cross-sectional view of the utility model;
In figure: EPB electronic parking system 1, rangefinder 2, pedestal 3, magnet 4, shield 5, coil 6, friction plate 7, brake disc
8, caliper bracket 9, master cylinder 10.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
As shown in Figure 1 and Figure 2, the utility model includes EPB electronic parking system 1, friction plate 7, brake disc 8, caliper bracket
9, master cylinder 10;Brake disc 8 and caliper bracket 9 are connected, and the two sides of brake disc 8 are respectively provided with a friction plate 7.In addition, further including surveying
Away from group, ranging group is equipped with rangefinder 2, pedestal 3, magnet 4, coil 6.Left end and right end of the friction plate 7 close to the part of brake disc 8
The distance between be less than part of the friction plate 7 far from brake disc 8 left end and the distance between right both ends and formed two it is symmetrical
Step.Two stepped portions of the friction plate 7 of 10 this side of master cylinder are respectively provided with a ranging group.Pedestal 3 and caliper bracket 9 are solid
Even.Rangefinder 2, magnet 4, coil 6 are connected with pedestal 3.Wherein close to corresponding brake disc 8, magnet 4 is located to be surveyed rangefinder 2
Between distance meter 2 and coil 6.
Preferably, further including having shield 5, the shield 5 and caliper bracket 9 are fixed together, and the shield 5 is located at pincers
For body support frame 9 close to the side of friction plate 7, the outer rim of shield 5 is equipped with the bending part to caliper bracket 9.In addition, rangefinder 2 is close
The axis of master cylinder 10.
The above EPB electronic parking system 1, rangefinder 2, pedestal 3, magnet 4, shield 5, coil 6, friction plate 7, brake disc 8,
Caliper bracket 9, the specific structural details of master cylinder 10 this ten components, specific connection relationship or the company for having connection relationship between each other
Connect details, or because of connection structure known to being or because being that this will not be repeated here for simple structure.
The specific embodiment of the above is only the preferable embodiment of the utility model, and is not limited with this practical
Novel specific implementation structure and practical range.In fact, according to shape, structure and purpose of design described in the utility model
Some equivalent variations can be made.Therefore, all according to made by shape, structure and purpose of design described in the utility model
Some equivalence changes ought to be all contained in the protection scope of the utility model namely these equivalence changes all should be by this reality
With novel protection.