CN202886049U

CN202886049U - Testing key of brake

Info

Publication number: CN202886049U
Application number: CN 201220578635
Authority: CN
Inventors: 李伟; 陈捷; 凌锋
Original assignee: HUAITE (CHINA) DRIVING PRODUCT CO Ltd
Current assignee: HUAITE (CHINA) DRIVING PRODUCT CO Ltd; WHITE (CHINA) DRIVE PRODUCTS CO Ltd
Priority date: 2012-11-06
Filing date: 2012-11-06
Publication date: 2013-04-17
Anticipated expiration: 2022-11-06

Abstract

The utility model discloses a testing key of a brake. The testing key is a rectangular key; curved grooves are symmetrically formed on two sides of the lower part of the testing key; surfaces acting with respect to a key groove are formed below the curved grooves; an included angle less than 90 degrees can be generated between the acting surfaces and the bottom surface of the testing key; the sum of the included angle and the rotation angle of the testing key in testing is 90 degrees; the side length of the acting surfaces is less than the depth of the key groove; the height from the centers of the curved grooves to the bottom surface is more than the depth of the key groove, and the width of the bottom surfaces of the curved grooves is less than that of the key groove; and chamfers are formed at the bottom part of the testing key. The testing key of the brake has the advantages that the stressed area of the key groove is increased based on the mechanics point of view, and aided supporting lines are adopted, so that the problem that the key groove is damaged due to pulling can be solved, the key groove can be prevented from deforming, the problem due to the quality of a product caused by testing the brake can be avoided, and the production cost can be saved; the testing key is manufactured by 45 steel, so that the testing key is low in price; one testing key can be recycled for about 200 times each day and can be put into service for half a month and even one month; the testing key is simple to operate, and the testing key just needs to be directly placed into the key groove, so that the process and the time are saved.

Description

A kind of detent feeler switch

Technical field

The utility model relates to a kind of connecting key, particularly a kind of detent feeler switch.

Background technology

At present, the detent feeler switch that uses of the same trade substantially all is that soft key is joined hard groove, and namely the hardness of keyway is the hardness greater than key, yet joins the special process of hardkey for soft groove, and is just different to the requirement of feeler switch.

At first, what soft groove joined that the hardkey of hardkey uses is the rectangle square key that plain grinding is crossed, and the key undersized satisfies tolerance in the keyway size.Detent is when test, owing to will test the moment of torsion of detent, in the end have the braking torque of moment in the test procedure, so that key produces deflection or the deflection trend of moment in keyway, the stress that produces is much larger than the yield strength of keyway corner, pulling of final formation keyway namely changed the width of keyway, makes the stressed limit distortion of keyway corner.Because this situation, in the test process of detent product, always more or less appearance keyway is pulled phenomenon, causes serious product quality problem, even suffers customer complaint.

Because the designing requirement of detent product, the size of testing standard, keyway and feeler switch can't change.Did during this time multiple trial, and comprised that the testing tube joint increased throttle orifice, and increased test fixture and tight power, and did the test rectangle key of the similar standard key of soft, this problem of alleviation that all can only be slight does not really solve.And greatly increased workman's labour intensity.

The utility model content

Utility model purpose: for the problems referred to above, the purpose of this utility model provides a kind of detent feeler switch, particularly joins the detent test of hardkey for soft groove, avoids the detent product to pull problem at the keyway of test process, guarantee that keyway without distortion, guarantees that simultaneously feeler switch is durable.

Technical scheme: a kind of detent feeler switch, be the rectangle square key, described feeler switch bottom symmetria bilateralis is offered arch groove, it is the acting surface with keyway below the described arch groove, described acting surface and described feeler switch bottom surface form the angle less than the right angle, deflection angle sum when described angle and the test of described feeler switch is 90 °, the length of side of described acting surface is less than the keyway degree of depth, the height of described arch groove center to described bottom surface is greater than the keyway degree of depth, the width of described bottom surface is less than width of keyway, and described feeler switch bottom is chamfering all.

Best, width and the width of keyway of described bottom surface differ 0.02mm.

Best, the angle that described acting surface and described feeler switch bottom surface form is 88 °.

During the test of described feeler switch, the described arch groove after keyway coboundary and the deflection does not contact, and does not pull keyway with assurance.

Best, described chamfering is rounded corner, after the feeler switch deflection, when the feeler switch bottom propped up the keyway bottom, feeler switch can stressedly not rupture, and can not produce damage to keyway yet.

Beneficial effect: compared with prior art, the utility model has the advantages that the auxiliary branch line of lifting surface area, use that increases keyway from the mechanics angle, solve keyway and pull problem, guarantee that keyway is without distortion, avoid the detent test is caused product quality problem, save production cost; Use 45 steel making feeler switchs, low price, a feeler switch recycles about 200 times every day, can use two weeks even one month; Simple to operate, directly feeler switch is put into keyway and got final product the saving activity time.

Description of drawings

Fig. 1 is the cross sectional representation of the utility model feeler switch;

Fig. 2 is that the utility model feeler switch keyway of packing into carries out the cross sectional representation of test mode.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only is used for explanation the utility model and is not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present utility model.

Shown in accompanying drawing 1-2, a kind of detent feeler switch, be the rectangle square key, feeler switch bottom symmetria bilateralis is offered arch groove 1, its arc radius is R1, and arch groove is and the acting surface 2 of keyway that acting surface 2 and 3 formation of feeler switch bottom surface are less than the angle δ at right angle below 1, the feeler switch bottom is rounding all, and its arc radius is R2.The length of side E of acting surface 2 is less than keyway degree of depth C, and 3 height B is greater than keyway degree of depth C to the bottom surface at arch groove 1 center, and the width A of bottom surface 3 is less than width of keyway D.

Feeler switch is produced for the moment moment of torsion that overcomes that detent produces in when brake moment powerful effect of stress on keyway, and the keyway that causes distortion is pulled, the key position of the utility model test key structure just is angle δ and size B, E.

Still adopt soft groove to join the test technology of hardkey, the test simulation operating mode of the utility model feeler switch as shown in Figure 2:

When 1) testing braking torque, give feeler switch moment moment of torsion, cause feeler switch to the moment stress f of keyway, cause feeler switch in keyway, to deflect, perhaps the trend of deflection;

2) prop up keyway bottom right bottom when feeler switch deflects to its lower right corner, when forming the fulcrum g of line contact, side, feeler switch lower-left contacts with the keyway left surface so that the whole left surface of keyway sustain feeler switch to moment stress.Herein, this contact area is the bigger the better, and namely E is the bigger the better, but can not be random undue large, must dodge the coboundary that splines.After this just required feeler switch deflection, E was less than C, and the coboundary of keyway must be under the center deviation of arch groove 1 arc radius R1, and B is slightly larger than C;

3) the arc radius R1 of arch groove 1 is that the keyway coboundary can not be run into feeler switch after must guaranteeing feeler switch deflection, and only this requirement, so R1 can not be too little, otherwise the center section of feeler switch is meticulous, can reduce intensity and the serviceable life of feeler switch;

4) the arc radius R2 of rounded corner only needs rounding, because keyway bottom tensile strength is very large, feeler switch is fallen wedge angle, although can not have much impact to keyway, when feeler switch and keyway formation fulcrum g, wedge angle is easy to stressed fracture;

5) in whole test process, deflection angle β and the angle δ sum in feeler switch when test are 90 °, angle δ can not be excessive can not be too small, pass through test of many times and observation, angle δ is best 88 ° of left and right sides effects, and namely the maximum deflection angle of feeler switch just only has about 2 °;

6) A is slightly less than D, because also need chamfering R2, so A and D differ about 0.02mm and get final product;

7) other size of feeler switch only needs connected test fixture size gap to cooperate and gets final product.

The utility model detent feeler switch proposes from test angle, and it mainly is the test technology of joining hardkey for soft groove, but obviously is to be equally applicable to the test technology that soft key is joined hard groove.And feeler switch also can be used as the axle connecting key use of normal linkage function.

The manufacturing process of the utility model detent feeler switch may further comprise the steps:

Step 100: select bar: 45 steel, hardness is less than HRC28;

Step 200: thermal treatment: bar reaches hardness HRC42-46 through 850 ℃ of normalizings, 840 ℃ of quenchings, 600 ℃ of temper;

Step 300: line cutting: feeler switch size according to claim 1, carry out the line cutting, remove all wedge angle burrs.

Claims

1. detent feeler switch, be the rectangle square key, it is characterized in that: described feeler switch bottom symmetria bilateralis is offered arch groove, it is the acting surface with keyway below the described arch groove, described acting surface and described feeler switch bottom surface form the angle less than the right angle, deflection angle sum when described angle and the test of described feeler switch is 90 °, the length of side of described acting surface is less than the keyway degree of depth, the height of described arch groove center to described bottom surface is greater than the keyway degree of depth, the width of described bottom surface is less than width of keyway, and described feeler switch bottom is chamfering all.

2. a kind of detent feeler switch according to claim 1, it is characterized in that: width and the width of keyway of described bottom surface differ 0.02mm.

3. a kind of detent feeler switch according to claim 1 is characterized in that: the angle that described acting surface and described feeler switch bottom surface form is 88 °.

4. a kind of detent feeler switch according to claim 1 is characterized in that: during described feeler switch test, the described arch groove after keyway coboundary and the deflection does not contact.

5. a kind of detent feeler switch according to claim 1, it is characterized in that: described chamfering is rounded corner.