CN100359196C - Tandem Combined Thrust Bearings with Circumferential Groove Spacers - Google Patents

Abstract

The present invention relates to a series connection combination type thrust bearing with spacing rings of circumferential grooves, which belongs to the field of bearings in mechanical engineering. The lengths of inner spacing rings and outer spacing rings are equal, the thicknesses of the inner spacing rings and the outer spacing rings are respectively equal, and a plurality of rows of grooves are arranged on the inner spacing rings or/and the outer spacing rings along the circumferential direction vertical to an axis line in an equal division mode. The series connection combination type thrust bearing with spacing rings of circumferential grooves has substantial characteristics and has obvious progress. Because the thicknesses of most of the outer spacing rings are increased, the bearing is not easily deformed by the heat treatment. In the machining process, a special tooling clamp tool can be omitted, and the technology of turning an inner circle and an outer circle and equally dividing a milling groove can be completed once. The series connection combination type thrust bearing with spacing rings of circumferential grooves has the advantages of simple structure and easy production. The rejection rate is greatly reduced, and thus, the production cost is greatly reduced.

Description

Tandem Combined Thrust Bearings with Circumferential Groove Spacers

technical field

The invention relates to a combined thrust bearing, in particular to a series combined thrust bearing with circumferential groove spacers, which belongs to the field of bearings in mechanical engineering.

Background technique

Series combined thrust cylindrical roller bearings are specially used for important chemical and light industrial machinery equipment - parallel flat screw extruders. It is a new type of thrust bearing group with small radial size and large load capacity. When the parallel twin-screw extruder is working, a large axial force is generated on the rotating screw. Since the axial distance between the two parallel-arranged screws is very small, the size of the thrust bearing is limited, so a group of several smaller outer Thrust bearings with the same diameter are used to share the axial load. This high-load thrust bearing set is composed of several identical non-standard thrust cylindrical roller bearings and cylindrical inner spacers and outer spacers in series. It is located between the adjacent shaft rings of the thrust bearing group, and the outer spacer is located between the adjacent seat rings of the thrust bearing group; each thrust cylindrical roller bearing should be able to share the total axial load more evenly, which is the thrust The key to the large load capacity of the bearing group is to prevent the life of the entire bearing group from being shortened due to excessive load of individual bearings. However, in order to make the load of each thrust cylindrical roller bearing in the thrust bearing group uniform, the axial rigidity value of the inner and outer spacers should satisfy the following proportioning relationship under the premise that the axial lengths of the inner and outer spacers are equal: The axial stiffness of the first outer spacer should be equal to i multiplied by the axial stiffness of the first outer spacer, the axial stiffness of the first outer spacer is equal to the axial stiffness of the last inner spacer, the same arrangement position The sum of the axial rigidities of the inner and outer spacers should be equal; in addition to meeting the above requirements, the axial stiffness values of the inner and outer spacers should be as small as possible, that is, the spacers can produce certain axial deformation Elastic elements, so that the axial force can be transmitted and shunted to each thrust cylindrical roller bearing as required through the axial elastic deformation of each inner and outer spacer. Since the inner and outer spacers are cylindrical structures with equal lengths, according to the theoretical principle that the axial stiffness is proportional to the cross-sectional area, the ratio of the above axial stiffness is the inner and outer spacers at the same position The numerical relationship of the cross-sectional area. The current method to achieve this requirement is to design and manufacture the thicknesses of the inner and outer spacers to be unequal. From the perspective of the arrangement order, the thickness of the outer spacers increases from thin to thick, and the inner spacers The thickness of the rings decreases in reverse, and the inner and outer spacers are slightly thicker and equal in thickness at both ends of the support. How big the diameter is, the theoretical design is basically the same. After searching the literature, it is found that the Chinese patent number is: 00258777, the name is: type tandem thrust cylindrical roller bearing with shaft, and the patent technology reads as: a type tandem thrust cylindrical roller with shaft Roller bearings, which are composed of single-stage thrust cylindrical roller bearings, outer spacers, inner spacers and shafts, the inner and outer spacers between single-stage thrust cylindrical roller bearings are connected in series on the shaft, and locked with spring collars tight to form a shaft-type tandem thrust cylindrical roller bearing unit assembly. The utility model is a non-detachable unit assembly, which is very convenient to use, not only reduces the labor intensity, but also ensures the bearing assembly accuracy and load-bearing performance, and improves the service life. Although the patented technology uses inner and outer spacers with unequal thickness and variable cross-section to transmit and divide the axial force under the condition of limited radial dimension of the bearing, the load capacity of the tandem thrust cylindrical roller bearing unit assembly is doubled, but When processing the thin wall of the outer spacer, it is not easy to machine and process, and special fixtures are required, and it is easy to deform excessively after heat treatment, which brings difficulties to the subsequent grinding process and has a high processing reject rate; the inner spacer The inner concave structure also has the problem of difficult cutting and machining. Those arranged in the rear position need to remove a large amount of metal in the deep cavity in the middle from the small inner diameter hole, so that the application of the above technology is greatly restricted; and if only Increasing the thickness of some thin-walled spacers will not meet the requirements of the proportioning relationship; if the thickness of all spacers is increased according to the proportioning relationship, then the axial elasticity of the spacers will decrease, making it difficult to deform axially and transmit force.

Contents of the invention

Aiming at the deficiencies and defects of the prior art, the present invention provides a series combined thrust bearing with a circumferential groove spacer, which overcomes the processing limitation, and designs the thin-walled spacer with unequal thickness and variable cross-section in the prior art into Equal-thickness variable elastic spacer changes the structure of the spacer and greatly facilitates its processing.

The present invention is composed of several identical non-standard thrust cylindrical roller bearings and cylindrical inner spacers and outer spacers in series. The outer spacer rings are located between the shaft rings, and the outer spacer rings are located between the seat rings. The lengths of all the inner and outer spacer rings are equal, and the thicknesses of the inner and outer spacer rings are respectively equal. The upper edge of the inner spacer ring or/and the outer spacer ring is perpendicular to the The circumferential direction of the axis is equally divided and staggered to open multiple rows of grooves. The number of grooves on each inner spacer is arranged in order from more to less, or the length of the groove is arranged in order from short to long, or the width of the groove is arranged in order from narrow to wide; The number of slots on the outer spacer is arranged in order from less to more, or the slot length is arranged in order from long to short, or the slot width is arranged in order from width to narrow.

Compared with the outer spacer of the original bearing, the thickness of the outer spacer of the present invention is increased. The thickness of all the outer spacers is equal, and the thickness of all the inner spacers is also equal. The inner and outer spacers are milled out in equal parts along the circumferential direction perpendicular to the axis. After multiple rows of long grooves, the axial stiffness of the spacer decreases, and its connecting part is more likely to produce axial elastic deformation. However, due to the number of grooves or the length or width of the grooves, the axial stiffness still meets the requirements of each thrust in the bearing group. Cylindrical roller bearings evenly carry the requirements for the proportioning relationship of the axial stiffness of each spacer.

The present invention has substantive features and remarkable progress. The inner and outer spacers have the same thickness respectively, and the proportioning relationship of axial stiffness is satisfied through different circumferential slots on the inner and outer spacers; since the thickness of most outer spacers increases, heat treatment It is not easily deformed, and in the metal cutting machining process of the inner and outer spacers, the special tooling fixture can be omitted, and the turning center (CNC lathe) with a C-axis can be used for turning without secondary clamping, and the inner and outer turning can be completed at one time. The process of milling the outer circle and equally divided milling grooves, the present invention is simple in structure, easy to manufacture, the scrap rate is greatly reduced, and the production cost is thus greatly reduced; because the inner and outer spacers are easier to realize the axial direction by slotting under a certain thickness condition. The stiffness is small and meets the requirements of the ratio of axial stiffness for the transmission and distribution of axial force. Therefore, the tandem combined thrust bearing with the circumferential groove spacer not only has a large load, but also the load of each thrust cylindrical roller bearing is relatively large. uniform.

Description of drawings

Fig. 1 structural representation of the present invention

Fig. 2 The front view of the outer spacer in the second position of the present invention

Fig. 3 vertical axis sectional view of the outer spacer in the second position of the present invention

Fig. 4 The front view of the outer spacer in the third position of the present invention

Fig. 5 vertical axis sectional view of the outer spacer in the third position of the present invention

Fig. 6 The front view of the inner spacer in the third position of the present invention

Fig. 7 vertical axial section view of the inner spacer in the third position of the present invention

Fig. 8 Front view of the inner spacer in the fourth position of the present invention

Fig. 9 vertical axial sectional view of the inner spacer in the fourth position of the present invention

Detailed ways

As shown in Figures 1 to 9, the present invention includes: a shaft ring 1, a cage assembly 2, a seat ring 3, an inner spacer 4, and an outer spacer 5; the present invention consists of several identical non-standard thrust cylindrical roller bearings It is formed in series with the cylindrical inner spacer 4 and the cylindrical outer spacer 5, wherein the non-standard thrust cylindrical roller bearing includes a shaft ring 1, a cage assembly 2, and a seat ring 3, and the inner spacer 4 is located on each shaft ring 1, the outer spacer 5 is located between the seat rings 3, all the inner spacer 4 and the outer spacer 5 have the same length, the thickness of the inner spacer 4 and the outer spacer 5 are respectively equal, the inner spacer 4 or/ On the outer spacer 5, a plurality of rows of grooves 6 are evenly divided and staggered along the circumferential direction perpendicular to the axis, and the number of grooves 6 on each inner spacer 4 is arranged in order of more directions and less, or the length of the grooves is in order of short and long. Arrangement or groove width is arranged in order from narrow to wide; the number of grooves 6 on each outer spacer 5 is arranged in order from less to more, or the length of the groove is arranged in order from long to short, or the groove width is arranged in order from width to narrow , so that the axial stiffness of each inner spacer 4 gradually decreases according to the order of arrangement, and the axial stiffness of each outer spacer 5 gradually increases according to the order of arrangement, so that the uniform load of each thrust cylindrical roller bearing in the tandem combination thrust bearing is satisfied. The proportioning relation requirements of the axial rigidity of the inner spacer ring 4 and the outer spacer ring 5.

Claims (1)

1. A series combined thrust bearing with a circumferential groove spacer, including: shaft ring (1), cage assembly (2), seat ring (3), inner spacer (4), outer spacer ( 5); It is characterized in that it is composed of several identical non-standard thrust cylindrical roller bearings and cylindrical inner spacers (4) and cylindrical outer spacers (5) in series, and the non-standard thrust cylindrical roller bearings Including shaft ring (1), cage assembly (2), seat ring (3), the inner spacer (4) is located between each shaft ring (1), and the outer spacer (5) is located between each seat ring (3) All the inner spacers (4) and outer spacers (5) are equal in length, the thicknesses of the inner spacers (4) and the outer spacers (5) are respectively equal, and the inner spacers (4) and/or outer spacers (5) Along the circumferential direction perpendicular to the axis, multiple rows of grooves (6) are evenly divided and staggered, and the number of grooves (6) on each inner spacer (4) is arranged in order of more directions or less, or the length of the grooves is shorter. Arrange in order from long to long or slot width from narrow to wide; the number of slots (6) on each outer spacer (5) is arranged in order from less to more or the length of the slots is arranged in order from long to short or the slots Arranged from wide to narrow.

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