CN100429044C - High precision overloading composite bearing structure - Google Patents

Abstract

The invention discloses a high-precision heavy-duty composite bearing structure, which includes a main shaft, an inner cone rolling bearing, a thrust bearing, an end cover, an axial static pressure bearing, a radial static pressure bearing and an elastic body. The two ends of the shaft shoulder at the front end of the main shaft are respectively equipped with an axial hydrostatic bearing and a radial hydrostatic bearing. In the front support; the rear end of the main shaft is equipped with an inner cone rolling bearing and a thrust bearing in sequence. The rear end of the thrust bearing is axially connected to the end cover through an elastic body, and the end cover is fixedly connected to the rear support of the main shaft box. The invention has the advantages of large bearing capacity and high rotation precision of the bearing system, and can support a workpiece with a weight of 20 tons for high-precision grinding.

Description

High-precision heavy-duty composite bearing structure

technical field

The invention relates to a heavy-duty composite bearing used in the machine tool industry, in particular to a high-precision composite bearing used for the headstock of a heavy-duty grinder and the headstock of a heavy-duty lathe.

Background technique

At present, on domestic and foreign high-precision heavy-duty roll grinders and high-precision heavy-duty cylindrical grinder headstocks, the spindle bearings of the live spindle are mostly rolling bearings. Its bearing capacity is small, and the rotation accuracy is not high, and the bearing must be imported from abroad. This directly affects the quality of workpiece processing and restricts the improvement of machine tool precision.

Contents of the invention

The present invention aims to solve the problems of low bearing capacity and low rotation accuracy of the headstock spindle bearings of existing roll grinders and cylindrical grinders, and at the same time reduce the processing difficulty and assembly difficulty of the headstock, and provide a high-precision heavy-duty composite bearing structure.

In order to achieve the above object, the technical solution adopted by the present invention is: a high-precision heavy-duty composite bearing structure, including a main shaft, an inner cone rolling bearing, a thrust bearing, an end cover, an axial hydrostatic bearing, a radial hydrostatic bearing, an elastic body.

The two ends of the shaft shoulder at the front end of the main shaft are respectively equipped with axial hydrostatic bearings and radial hydrostatic bearings. In the front support, the rear end of the main shaft is equipped with an inner cone rolling bearing and a thrust bearing in sequence. The rear end of the thrust bearing is axially connected to the end cover through an elastic body, and the end cover is fixedly connected to the rear support of the main shaft box.

The rolling bearing is an inner tapered rolling bearing that can axially move slightly along with the main shaft; the axial hydrostatic bearing, the radial hydrostatic bearing and the front support of the headstock are fixedly connected by bolts.

The radial direction and the axial direction of the front end of the live main shaft of the headstock of the present invention are both supported by static pressure bearings, and the rear end is supported by inner cone rolling bearings and thrust bearings. This high-precision heavy-duty composite bearing structure is mainly based on the static pressure bearing at the front end, supplemented by inner cone rolling bearings and thrust bearings at the rear end, and can support high-precision grinding of workpieces weighing 20 tons. It avoids the processing and assembly problems that the front and rear ends are both static pressure bearings, and also overcomes the problems of small bearing capacity and poor rotation accuracy of both front and rear ends being rolling bearings.

Therefore, the beneficial effect of the present invention is that the bearing system has a large bearing capacity, high rotation precision, and can support a workpiece with a weight of 20 tons for high-precision grinding.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Detailed ways

As shown in Figure 1, the high-precision heavy-duty composite bearing structure of the grinding machine head frame consists of the top 1, the main shaft 2, the axial hydrostatic bearing 3, the radial hydrostatic bearing 4, the inner cone rolling bearing 5 and the thrust bearing 6, and the end Cover 8, adjust elastic body 7 and other components.

The two ends of the shaft shoulder at the front end of the main shaft 2 are respectively equipped with an axial hydrostatic bearing 3 and a radial hydrostatic bearing 4, and the axial hydrostatic bearing 3 and the radial hydrostatic bearing 4 are fixedly connected, and the It is fixedly connected in the front support of the main shaft box; the axial hydrostatic bearing 3 is fixedly connected with the front support of the radial hydrostatic bearing 4 and the main shaft box with bolts.

The bearings at the rear end of the main shaft 2 are installed in turn with an inner cone rolling bearing 5, a thrust bearing 6, and the rear end of the thrust bearing 6 is connected to the end cover 8 axially through an elastic body 7, and the end cover 8 and the rear support of the main shaft box are fixed by screws connect.

The main shaft 2 is mainly composed of the axial hydrostatic bearing 3 and the radial hydrostatic bearing 4 at the front end, which have large carrying capacity and high rotation precision; the inner cone rolling bearing 5 and the thrust bearing 6 at the rear end of the main shaft 2 are auxiliary. The inner cone rolling bearing 5 can move slightly in the axial direction together with the main shaft; the thrust bearing 6 is connected with the end cover 8 by the elastic body 7 at the rear end, and according to the oil pressure between the axial static pressure bearing 3 at the front end and the Gap, adjust the gap and elastic force between the elastic body 7 and the end cover 8, so that it does not interfere with the work of the axial static pressure bearing 3 at the front end, and can absorb the force generated by the thermal deformation of the main shaft, and at the same time play an axial auxiliary role. The role of support. Such a structure can avoid and alleviate the difficulty of processing and assembly caused by both the front and rear static pressure bearings, and at the same time avoid the problem of the mutual influence of the front and rear static pressure bearings.

Claims (3)

1. a high precision overloading composite bearing structure comprises main shaft (2), rolling bearing (5), and thrust bearing (6), end cap (8) is characterized in that, also comprises axial hydrostatic bearing (3), hydrostatic bearing (4) radially, elastomer (7); Described main shaft (2) the front end shaft shoulder two ends are equipped with described axial hydrostatic bearing (3) and described radially hydrostatic bearing (4) respectively, fixedly connected between described axial hydrostatic bearing (3) and the described radially hydrostatic bearing (4), and be fixedly connected on by described axial hydrostatic bearing (3) in the preceding supporting of main spindle box; Described main shaft (2) rear end is equipped with described rolling bearing (5), described thrust bearing (6) successively, described thrust bearing (6) rear end axially is connected with described end cap (8) by described elastomer (7), and described end cap (8) is fixedlyed connected with the back supporting of main spindle box.

2. high precision overloading composite bearing structure according to claim 1 is characterized in that, described rolling bearing (5) is can be with the internal cone type rolling bearing of the axial micro-play of main shaft.

3. high precision overloading composite bearing structure according to claim 1 is characterized in that, described axial hydrostatic bearing (3) is bolted to connection with the preceding supporting of hydrostatic bearing (4) radially and main spindle box.

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