CN201013767Y

CN201013767Y - Telescope-feed long cone static-kinetic pressure chief axis structure

Info

Publication number: CN201013767Y
Application number: CNU200720103730XU
Authority: CN
Inventors: 李颖仲
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-05
Filing date: 2007-03-05
Publication date: 2008-01-30
Anticipated expiration: 2017-03-05

Abstract

The utility model relates to a sleeve-type long cone static and dynamic pressing mainshaft structure which includes a sleeve, a cone mainshaft arranged in the sleeve and an oil membrane bearing arranged at two ends of the cone mainshaft; wherein, a throttler is arranged out of the sleeve or in the sleeve or on the oil membrane bearing. The utility model is provided with the throttler to control the oil feeding quantity of the environmental pressure oil supply device; the pressure oil enters an oil chamber arranged on an internal surface of the bearing through an oil path and leads the cone mainshaft subject to the support of the static pressure of the oil membrane; the bearing capability of the oil membrane bearing is reinforced; the efficacy of the static pressure bearing when in static or low speed condition is increased, meanwhile, the dynamic pressure effect is not affected, therefore, the utility model has the composite efficacy of dynamic and static pressure.

Description

The quiet dynamic pressure spindle structure of telescopic long cone

Technical field

The utility model relates to a kind of telescopic long cone main shaft structure, particularly sets up the quiet dynamic pressure spindle structure of telescopic long cone that the active and static pressure oil film supports on long cone main shaft structure.

Background technique

In industrial field, there are a variety of structures in mechanical drive shaft system, structure as shown in Figure 1, main shaft 1 ' is arranged in the sleeve 2 ' for long cone structure, preceding filmatic bearing 3 ' and back filmatic bearing 4 ' at same bus are done radial support, and axial positioning structure is by thrust bearing 5 ' (roll or slide) the bearing supporting of rear-end of spindle.This structure is a hydrodynamic configuration in the support design of preceding filmatic bearing 3 ', back filmatic bearing 4 ' generally.

Mostly be heavy wool wedge (stepped ramp type or circular arc type oil film wedge) in the bearing at present, when main shaft rotates, rely on the speed on main shaft surface, make the oil film wedge face of lubricant oil in bearing produce the running of oil film pressure supports main shaft.Why main shaft adopts cone structure is to utilize moving axially of cone to adjust the gap of main shaft and bearing, when main shaft 1 ' and bearing play are zero, then can be used as the back dead centre that utilizes main shaft 1 ' internal taper hole dress and fix to support and use, adopt this form more as the workhead main shaft of universal grinding machine external.Utilize moving axially of main shaft to make main shaft and bearing obtain the gap when main shaft need turn round, this kind structure is used when the external cylindrical grinding machine work spindle, because speed of work spindle is low, the oil film pressure of bearing is low, bearing capacity is poor, and therefore, its application is subjected to certain restriction.

The model utility content

The purpose of this utility model is to improve the shortcoming of prior art, and a kind of quiet dynamic pressure spindle structure of telescopic long cone with static pressure effect is provided, thereby improves main shaft bearing at low speed or bearing capacity, rigidity and precision stability when static.

For achieving the above object, the utility model is by the following technical solutions:

The quiet dynamic pressure spindle structure of a kind of telescopic long cone comprises sleeve, is installed in the cone main shaft in the sleeve and is arranged on the filmatic bearing at cone main shaft two ends, is provided with flow controller outside sleeve or in the sleeve or on filmatic bearing.

Described flow controller has the throttle style in aperture, capillary tube or gap.

The utility model compared with prior art has the following advantages:

The utility model is provided with the oil inlet quantity of flow controller control ambient pressure oil supplying device, pressure oil enters the oil pocket (the oil pocket number is generally more than 3 or 3) that bearing inner surface is provided with through in-line, making the cone main shaft be subjected to the oil film static pressure supports, strengthen the bearing capacity of filmatic bearing, hydrostatic bearing effect when making static or low speed increases, simultaneously do not influence the dynamic pressure effect, had the dynamic and static pressure composite effect thus.

Description of drawings

Fig. 1 is the schematic representation of existing cone main shaft structure;

Fig. 2 is a structural representation of the present utility model;

Fig. 3 is the enlarged view of A portion among Fig. 2.

Embodiment

Embodiment 1

As shown in Figures 2 and 3, the quiet dynamic pressure spindle structure of telescopic long cone described in the utility model, comprise sleeve 2, be installed in the cone main shaft 1 in the sleeve 2 and be arranged on the preceding filmatic bearing 3 at cone main shaft two ends, back filmatic bearing 4, on sleeve 2 and back filmatic bearing 4, be provided with in-line 6, in-line 6 connects sleeve 2 and back filmatic bearing 4, communicates with the oil pocket 8 of back filmatic bearing 4 internal surfaces; On sleeve 2 and preceding filmatic bearing 3, be provided with in-line 7, in-line 7 connects sleeve 2 and preceding filmatic bearing 3, communicate with the oil pocket 9 of preceding filmatic bearing 3 internal surfaces, in described in-line 6,7, capillary restrictor 5 is set, described in-line 6,7 connects with the ambient pressure oil supplying device, and flow controller 5 is used for controlling oil mass and the pressure that enters.

Claims

1. quiet dynamic pressure spindle structure of telescopic long cone comprises sleeve, is installed in the cone main shaft in the sleeve and is arranged on the filmatic bearing at cone main shaft two ends, it is characterized in that: be provided with flow controller outside sleeve or in the sleeve or on filmatic bearing.

2. the quiet dynamic pressure spindle structure of telescopic long cone according to claim 1 is characterized in that described flow controller has the throttle style in aperture, capillary tube or gap.