CN200972422Y - Mainshaft support device - Google Patents

Abstract

The utility model relates to a spindle-supporting device provided with a supporting component which is made up of an angular contact ball bearing group and a cylindrical roller bearing group positioned around the spindle. The supporting component enhances radial and axial loads, and improves the rotary precision of bearing. The side spindle supporting device is mainly comprises of a spindle with one end connected with a rim, a bearing sleeve mounted around the spindle, a end cover and a bearing sleeve which are separately connected to another end of spindle. The improvement of utility model is that the inner side of the bearing sleeve and both ends of spindle are separately provided with a fixed bearing group and a floating bearing; at the side of fixed bearing group, the fixed bearing group is fixed on the spindle by locking nuts.

Description

Main axis surpporting device

Technical field

The utility model relates to a kind of Main axis surpporting device, relates to the Main axis surpporting device that is applied to carry out the tyre last test particularly.

Background technology

Along with increasing substantially of domestic all kinds of sales of automobile, requirements at the higher level have been proposed for the safe handling and the relevant art standard of tire.

The endurance quality index is one of principal element that influences the tire safety use, in existing long duration test process, and the horizontal testing machine of comparatively general employing.During test, tire, is adopted rotary drum to apply and necessarily loads with lotus on main shaft by clamping, detects the numerical value of induction force by force transducer.Because the test period is longer, was generally tens days, thereby higher requirement arranged for self running accuracy and the long-time stability of rotary main shaft.

As accompanying shown in Figure 1, at the problem of diameter run-out that influences the main axis rotation precision and main shaft supporting thermomechanical stability, existing tyres durable testing machine adopts the fulcrum arrangement of the combined mechanism of two pairs of double-row conical bearings as rotary main shaft usually.Wherein, all sides of main shaft 1 are respectively arranged with a double-row conical bearing 5, annular stripped nut 3 and overcoat 6.Above-mentioned bearing arrangement is diametrically respectively by being connected wheel rim 8 outside socket tires 7 with end cap 2 and main shaft 1 by screw 4, screw 9.

In said structure, bearing 5 mainly bears axial load, and the radial load holding capacity is lower.It is bigger that but main shaft 5 and rotary drum thereof load load, and this running accuracy and noise that just is unfavorable for improving bearing 5 self is bigger.In addition, because the test duration is more normal, bearing 5 locking mode strictnesses can not be adjusted play automatically, and the main shaft bearing heating is serious, and serviceable life is short.And can't guarantee that owing to the limitation of roller machining precision bearing accuracy reaches higher requirement, also have influence on the raising of bearing self running accuracy.

The utility model content

Main axis surpporting device described in the utility model, its purpose of design are to address the above problem with deficiency provides angular contact ball bearing group and the combined bearing assembly of cylinder roller bearing group that is configured in main shaft week side.

One of purpose of design of the present utility model is, improves the load on radial and axial, can improve the running accuracy of bearing self.

Another purpose of design is, improves the rigidity of bearing self, to reduce the play after fixing and the noise of main shaft operation, can satisfy the requirement that the high precision main shaft is installed.

Its purpose of design also is, adopts mode fixing and that unsteady solid bearing combines, can adapt to the requirement of main shaft operation steady in a long-term.

For realizing above-mentioned purpose of design, described Main axis surpporting device mainly includes:

One end connects the main shaft of wheel rim, is provided with bearing holder (housing, cover) in all sides of main shaft, connects an end cap and bearing holder (housing, cover) respectively at the opposite side of main shaft;

Improvements of the present utility model are, in the inboard of described bearing holder (housing, cover), the two side ends of main shaft one a solid bearing group and a floating bearing are set respectively;

At the sidepiece of solid bearing group, the solid bearing group is fastened on the main shaft by set nut.

As the Main axis surpporting device of above-mentioned structure, in the long test period, self running accuracy of rotary main shaft is higher, and fixing bearing pack is bigger at the dynamic load on radial and axial, so can improve the running accuracy of bearing self.

Preferred design proposal is that described Main axis surpporting device adopts angular contact ball bearing group and the cylinder roller bearing supporting member as rotary main shaft.

In the described angular contact ball bearing group, adopt 2 angular contact ball bearings and abut against the same end of rotary main shaft, synthetically to bear the joint load of rotary main shaft on radial and axial.

In the described angular contact ball bearing group, the wide end surface of two bearings contacts mutually adjacent to each other.

Described angular contact ball bearing group, in the radial direction, be to arrange between the bearing by opposite direction, promptly adopt the arrangement of formula back-to-back, the purpose of She Zhiing is in order to guarantee the axial stability of Bearing Installation like this, particularly at main shaft during at high speed rotating, the supporting rigidity on radial and axial direction, its bearing non-deformability are stronger.

More preferred design proposal is, described angular contact ball bearing group be fastened on the rotary main shaft, near a side of end cap, and cylinder roller bearing is connected a side of wheel rim.

One annular boss is set on described rotary main shaft, and the angular contact ball bearing group is mounted thereto; At the opposite side of annular boss, a set nut is set on main shaft.By said structure, can in the radial direction the inner ring of angular contact ball bearing group closely be locked on the outer circumferential side of main shaft.

On described bearing holder (housing, cover), have can be provided with one with the corresponding boss of annular boss of above-mentioned rotary main shaft, the outer ring of angular contact ball bearing group closely can be locked in the inboard of bearing holder (housing, cover) by above-mentioned mutual structure.

Described cylinder roller bearing, its inner ring can be in the axial enterprising line slip of rotary main shaft.At rotary main shaft one side of fastening cylinder roller bearing, at arranged outside one annular boss of cylinder roller bearing, one circlip is arranged in the arranged outside of boss, spacing with the inner ring that is used for cylinder roller bearing.

Accordingly, a corresponding boss is set in the inboard of described bearing holder (housing, cover), fastening with the locking of the outer ring that is used for cylinder roller bearing.

Cause bearing temperature rising distortion when described Main axis surpporting device long-term operation after, cylinder roller bearing can carry out along the inner ring of rotary main shaft floating effectively, to adapt to the displacement demand of work.

In sum, advantage of the present utility model and beneficial effect are:

1, the angular contact ball bearing group of employing as above-mentioned architectural feature, it is bigger in the dynamic load rating on radial and axial, can improve the running accuracy of bearing self.

Noise during the less and main shaft operation of the play after 2, described angular contact ball bearing group, himself rigidity are big, fixing is little, can satisfy the high precision main shaft and install and use requirement;

3, described angular contact bearing group and cylinder roller bearing combination support mode, the angular contact bearing group adopts fixed form, and cylinder roller bearing adopts floating structure.Can adapt to the requirement of main shaft operation steady in a long-term.

Description of drawings

Now in conjunction with the accompanying drawings the utility model is described further:

Fig. 1 is existing testing machine Main axis surpporting device synoptic diagram;

Fig. 2 is the structural representation of Main axis surpporting device described in the utility model.

Have main shaft 10, end cap 11, screw 12, boss packing ring 14, set nut 13, angular contact ball bearing group 15, bearing holder (housing, cover) 16, circlip for shaft 17, cylinder roller bearing 18, wheel rim 19, screw 20, tire 21 as shown in Figure 2.

Embodiment

Embodiment 1, and as shown in Figure 2, described Main axis surpporting device mainly includes, angular contact ball bearing group 15, cylinder roller bearing 18, end cap 11, bearing holder (housing, cover) 16, set nut 13, main shaft 10, set nut 13.

Described Main axis surpporting device adopts the angular contact ball bearing group 15 of high precision combination and cylinder roller bearing 18 supporting member as main shaft 10, and is separately positioned on the two side ends of main shaft 10.

Described angular contact ball bearing group 15 includes 2 bearings, and is positioned at the same end of main shaft, synthetically to bear the radial and axial joint load of rotary main shaft.

2 bearings of described angular contact ball bearing group 15, its wide end surface contacts mutually adjacent to each other, and be that each bearing is by direction arrangement on the contrary in the radial direction, the purpose of She Zhiing is in order to guarantee the axial stability of Bearing Installation like this, particularly at main shaft during at high speed rotating, the supporting rigidity on radial and axial direction, its bearing non-deformability are stronger.

Design has an annular boss on main shaft 10, above described two angular contact ball bearings 15 are installed in.At the opposite side of boss, design has set nut 13 on the main shaft.By said structure, can in the radial direction the inner ring of two angular contact ball bearing groups 15 closely be locked on main shaft 10 outer circumferential sides.

In addition, the outer end of two angular contact ball bearings 15 is provided with end cap 11 and bearing holder (housing, cover) 16, and corresponding boss is arranged on bearing holder (housing, cover) 16.The outer ring of two angular contact ball bearings closely can be locked in by said structure on the bearing holder (housing, cover) 6 of side.

Described main shaft at the angular contact ball bearing other end, is provided with a cylinder roller bearing 18, and its inner ring can be in the enterprising line slip of rotary main shaft.

The outside design of described main shaft bearing supporting group has an annular boss, and the cylinder roller bearing inner ring is fixed on the main shaft.At the opposite side of boss circlip for shaft 17 being set, to be used for inner ring spacing.

On the described bearing holder (housing, cover) 16 locking that corresponding boss is used for cylinder roller bearing 18 outer rings is set, after main shaft long-term operation bearing temperature raise distortion, cylinder roller bearing 18 inner rings can float, to adapt to work requirements.

Claims (9)

1, a kind of Main axis surpporting device has the main shaft that an end connects wheel rim, is provided with bearing holder (housing, cover) in all sides of main shaft, connects an end cap and bearing holder (housing, cover) respectively at the opposite side of main shaft,

It is characterized in that: one a solid bearing group and a floating bearing are set respectively in the inboard of described bearing holder (housing, cover), the two side ends of main shaft;

At the sidepiece of solid bearing group, the solid bearing group is fastened on the main shaft by set nut.

2, Main axis surpporting device according to claim 1 is characterized in that: described Main axis surpporting device, adopt angular contact ball bearing group and the cylinder roller bearing supporting member as rotary main shaft.

3, Main axis surpporting device according to claim 2 is characterized in that: in the described angular contact ball bearing group, adopt 2 angular contact ball bearings and abut against the same end of rotary main shaft.

4, Main axis surpporting device according to claim 3 is characterized in that: in the described angular contact ball bearing group, the wide end surface of two bearings contacts mutually adjacent to each other.

5, Main axis surpporting device according to claim 4 is characterized in that: described angular contact ball bearing group in the radial direction, is to arrange by opposite direction between the bearing.

6, according to claim 2 or 5 described Main axis surpporting devices, it is characterized in that: described angular contact ball bearing group is fastened on a side of end cap on the rotary main shaft, close, and cylinder roller bearing is connected a side of wheel rim.

7, Main axis surpporting device according to claim 6 is characterized in that: an annular boss is set on described rotary main shaft, and the angular contact ball bearing group is mounted thereto; At the opposite side of annular boss, a set nut is set on main shaft.

8, Main axis surpporting device according to claim 7, it is characterized in that: on described bearing holder (housing, cover), have can be provided with one with the corresponding boss of annular boss of above-mentioned rotary main shaft, the outer ring of angular contact ball bearing group closely can be locked in the inboard of bearing holder (housing, cover) by above-mentioned mutual structure.

9, Main axis surpporting device according to claim 8 is characterized in that: described cylinder roller bearing, and its inner ring is in the axial enterprising line slip of rotary main shaft;

At rotary main shaft one side of fastening cylinder roller bearing, at arranged outside one annular boss of cylinder roller bearing, one circlip is arranged in the arranged outside of boss, spacing with the inner ring that is used for cylinder roller bearing;

Accordingly, a corresponding boss is set in the inboard of described bearing holder (housing, cover), fastening with the locking of the outer ring that is used for cylinder roller bearing.

Images