JPH0632733U - Slewing bearing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a slewing bearing capable of replacing a damaged member without lowering the slewing function and without significantly increasing the cost. [Structure] An inner ring 2 is rotatably fitted to an inner peripheral portion of an outer ring 3 via a steel ball 6, and the inner ring 2 includes a plurality of divided inner ring split members 2a and steel balls 6. The inner ring rolling surface ring 4 that rolls is integrally fastened by bolts 2b and 4a. Similarly, the outer ring 3 is also formed by integrally fastening the outer ring splitting member 3a and the outer ring rolling surface ring 5 on which the steel balls 6 are divided into a plurality of pieces by bolts 3b and 5a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention relates to a slewing bearing, and is particularly useful when applied to a slewing bearing of a construction machine having a slewing function such as a hydraulic excavator, a track lane, and a shield machine.

[0002]

[Prior art]

 FIG. 8 is a vertical cross-sectional view of a slewing bearing according to a conventional technique, which is an example of mounting on a hydraulic excavator. FIG. 9 is an enlarged view in which the slewing bearing portion of FIG. 8 is enlarged.

As shown in FIGS. 8 and 9, the slewing bearing 23 has an inner ring 23 a, an outer ring 23 b, and a steel ball 24. The inner ring 23a is a ring-shaped member, and is fastened to the upper end portion of the lower transporting body 21 with bolts or the like. In the circumferential direction of the outer peripheral surface of the inner ring 23a, a rolling surface 23d of a steel ball 24 having a U-shaped longitudinal section is provided, and in the circumferential direction of the inner peripheral surface of the inner ring 23a, internal teeth 23c are integrally formed. Is formed in. The outer ring 23b is a ring-shaped member and is fastened to the lower end of the upper revolving structure 22 with bolts or the like. The rolling surface 23e of the steel ball 24 having a U-shaped vertical section is provided in the circumferential direction of the inner peripheral surface of the outer ring 23b. The inner ring 23a is rotatably fitted to the outer ring 23b by interposing a steel ball 24 between the rolling surface 23d and the rolling surface 23e. The steel ball 24 rolls on the rolling surfaces 23d and 23e as the outer ring 23b turns around the outer circumference of the inner ring 23a. The gap between the inner ring 23a and the outer ring 23b is sealed by the seal 27 protruding from the lower part of the outer peripheral surface of the inner ring 23a and the upper part of the inner peripheral surface of the outer ring 23b.

In the slewing bearing having the above-described configuration, the output shaft gear 26 that meshes with the inner teeth 23c of the inner ring 23a is rotatably driven by the slewing reducer 25 fixed to the upper slewing body 22. The revolving unit 22 is revolved around the vertical axis.

[0005]

[Problems to be solved by the device]

 In the conventional slewing bearing as described above, the inner teeth 23c and the rolling surface 23d are integrally formed on the inner and outer peripheral surfaces of the inner ring 23a.

Therefore, for example, when the inner teeth 23c of the inner ring 23a are damaged, it is necessary to replace the entire inner ring 23a with a new inner ring 23a. At that time, the rolling surface 23e of the replaced inner ring 23a and the inner ring 23a are continuously used. The steel ball 24 and the outer ring 23b may not fit well with the rolling surface 23d, and the swivel function of the swivel bearing may deteriorate. Further, when the rolling surface 23d or the rolling surface 23e is damaged and only the inner ring 23a or the outer ring 23b is replaced, there is a possibility that the turning function is deteriorated similarly to the above.

Therefore, if the entire slewing bearing 23 is replaced with a new one, the cost will be significantly high.

In view of the above-mentioned conventional technique, the present invention aims to provide a slewing bearing capable of replacing a damaged member without lowering the slewing function and without significantly increasing the cost.

[0009]

[Means for Solving the Problems]

 The structure of the present invention that achieves the above object is a swivel bearing in which an inner ring is rotatably fitted through a steel ball on the inner periphery of an outer ring, and a plurality of split members are used for fastening bolts or the like. A member which is fastened with a member and is formed in a ring shape, and an inner ring split member having a groove extending in the circumferential direction of the outer peripheral surface thereof and a U-shaped member having a ring shape and extending in the circumferential direction of the outer peripheral surface. An inner ring having a groove, the inner ring having a groove fitted in the inner ring dividing member and having the inner ring dividing member and an inner ring rolling surface ring fastened with a fastening member such as a bolt, and a dividing member divided into a plurality of members. Is a member formed into a ring shape by fastening it with a fastening member such as a bolt, and an outer ring dividing member having a groove extending in the circumferential direction of the inner peripheral surface thereof, and a ring shape and a circumferential direction of the outer peripheral surface. Has a U-shaped groove extending over the entire length of the outer ring split portion And an outer ring having an outer ring rolling surface ring fastened with a fastening member such as a bolt.

[0010]

[Action]

 The inner ring and the outer ring that constitute the slewing bearing have a structure in which a plurality of inner ring split members or outer ring split members and the inner ring rolling surface ring or the outer ring rolling surface ring are fastened together by fastening members such as bolts. Therefore, for example, if the inner ring split member of the inner ring is damaged, remove the fastening members such as bolts, replace only the damaged inner ring split member with a new inner ring split member, and then continue to use the inner ring rolling surface. Together with the ring and the other inner ring dividing member, they are integrally fastened together by the fastening member such as the bolt.

Further, when the rolling surface of the inner ring rolling surface ring of the inner ring is damaged, the fastening members such as bolts are removed and only the damaged inner ring rolling surface ring and outer ring rolling surface ring of the outer ring are newly replaced. Tana After replacing the inner ring rolling surface ring and the outer ring rolling surface ring, the inner ring and outer ring dividing members of the inner ring and outer ring, which are used continuously, are re-fastened together with the bolts and other fastening members. To do.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a slewing bearing according to this embodiment, FIG. 2 is a perspective vertical cross-sectional view of an inner ring shown in FIG. 1, and FIG. 3 is a perspective vertical cross-sectional view showing a divided state of the inner ring shown in FIG. Fig. 4 is a perspective view of the inner ring rolling surface ring shown in Fig. 1, Fig. 5 is a perspective vertical sectional view of the outer ring shown in Fig. 1, and Fig. 6 is a perspective view showing a divided state of the outer ring shown in Fig. 1. FIG. 7 is a longitudinal sectional view, and FIG. 7 is a perspective view of the outer ring rolling surface ring shown in FIG.

As shown in FIG. 1, the slewing bearing 1 has an inner ring 2, an outer ring 3 and a steel ball 6.

Of these, the inner ring 2 is a ring-shaped member including a plurality of inner ring split members 2a obtained by splitting the inner ring 2 in the axial direction and the circumferential direction as shown in FIGS. The upper and lower inner ring dividing members 2a divided in the axial direction are fastened by bolts 2b which penetrate the inner ring dividing member 2a from top to bottom.

Inner teeth 2c that mesh with a gear (not shown) are formed on the inner peripheral surface of the inner ring 2. A groove having a U-shaped vertical cross section is formed in the outer peripheral surface of the inner ring 2, and the inner ring rolling surface ring 4 is fitted in the groove. The inner ring rolling surface ring 4 is a ring-shaped member integrally formed as shown in FIG. 4, and further has a groove having a U-shaped longitudinal section along the circumferential direction of the outer peripheral surface. Is a rolling surface 4b on which the steel ball 6 rolls. Further, the inner ring rolling surface ring 4 has bolt holes 4c in the upper and lower portions thereof in the circumferential direction, and is fastened to the inner ring split member 2a by bolts 4a passing through the bolt holes 4c. The bolt hole 4c is counterbored so that the head of the bolt 4a is sunk below the outer peripheral surface of the inner ring raceway ring 4 to prevent the outer ring raceway ring 5 from turning. There is.

The outer ring 3 is a ring-shaped member composed of a plurality of outer ring split members 3a obtained by splitting the outer ring 3 in the axial direction and the circumferential direction as shown in FIGS. The upper and lower outer ring split members 3a that are split in the axial direction are fastened by bolts 3b that penetrate the outer ring split member 3a from bottom to top.

A groove having a U-shaped longitudinal cross section is formed in the inner peripheral surface of the outer ring 3 in the circumferential direction, and the outer ring rolling surface ring 5 is fitted in the groove. The outer ring rolling surface ring 5 is a ring-shaped member integrally formed as shown in FIG. 7, and has a U-shaped groove having a U-shaped longitudinal section along the circumferential direction of the inner peripheral surface. The groove serves as a rolling surface 5b on which the steel ball 6 rolls. The outer ring rolling surface ring 5 has bolt holes 5c in the upper and lower portions thereof in the circumferential direction, and is fastened to the outer ring split member 3a by bolts 5a passing through the bolt holes 5c. The bolt hole 5c is counterbored so that the head of the bolt 5a is sunk from the inner peripheral surface of the outer ring raceway ring 5 to prevent the outer ring raceway ring 5 from turning. .

The inner ring 2 is rotatably fitted to the outer ring 3 by interposing a steel ball 6 between the inner ring rolling surface ring 4 and the outer ring rolling surface ring 5. The steel ball 6 rolls on the rolling surfaces 4b and 5b as the outer race 3 turns around the outer circumference of the inner race 2.

A gap between the inner ring 2 and the outer ring 3 is sealed by a seal 7 protruding from a lower portion of the outer peripheral surface of the inner ring 2 and an upper portion of the inner peripheral surface of the outer ring 3.

According to the above-described embodiment, since the inner ring 2 and the outer ring 3 constituting the slewing bearing 1 each have a structure in which a plurality of members are fastened with bolts, for example, when the inner teeth 2c of the inner ring 2 are damaged. Removes the bolts 2b and 4a, disassembles the inner ring 2 into individual inner ring dividing members 2a and inner ring rolling surface rings 4, and replaces only the inner ring dividing member 2a having the damaged inner teeth 23c with a new inner ring dividing member 2a. After that, the inner ring rolling surface ring 4 and the other inner ring dividing member 2a which are continuously used are fastened together again by the bolts 2b and 4a.

When the rolling surface 4b of the inner ring rolling surface ring 4 of the inner ring 2 is damaged, the bolts 2b, 3b, 4a, 5a are removed and the inner ring 2 and the outer ring 3 are disassembled into individual members, After replacing only the inner ring rolling surface ring 4 and the outer ring rolling surface ring 5 with new inner ring rolling surface ring 4 and outer ring rolling surface ring 5, together with the inner ring dividing member 2a and outer ring dividing member 3a that are continuously used. The bolts 2b, 3b, 4a and 5a are integrally fastened again.

[0023]

[Effect of device]

 As described in detail in connection with the above embodiments, the present invention is configured so that the inner ring and the outer ring forming the slewing bearing are integrally formed by fastening a plurality of members with fastening members such as bolts. When a part of the outer ring is damaged, it is not necessary to replace the entire slewing bearing because the conventional slewing function can be obtained by replacing only a part of the member related to the part with a new member.

Therefore, the cost is significantly reduced as compared with the case where the entire slewing bearing is replaced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a slewing bearing according to an embodiment of the present invention.

FIG. 2 is a perspective vertical cross-sectional view of the inner ring shown in FIG.

FIG. 3 is a perspective vertical sectional view showing a divided state of the inner ring shown in FIG.

4 is a perspective view of the inner ring rolling surface ring shown in FIG. 1. FIG.

5 is a perspective vertical sectional view of the outer ring shown in FIG. 1. FIG.

FIG. 6 is a perspective vertical cross-sectional view showing a divided state of the outer ring shown in FIG.

7 is a perspective view of the outer ring rolling surface ring shown in FIG. 1. FIG.

FIG. 8 is a vertical cross-sectional view of a conventional slewing bearing mounted on a hydraulic excavator.

9 is an enlarged view of the orbiting bearing portion of FIG. 8 in an enlarged manner.

[Explanation of symbols]

 1 Slewing bearing 2 Inner ring 3 Outer ring 4 Inner ring rolling surface ring 5 Outer ring rolling surface ring 6 Steel ball 2a Inner ring dividing member 2b Outer ring dividing member 2b, 3b, 4a, 5a Bolt

Claims (1)

[Scope of utility model registration request] 1. In a slewing bearing in which an inner ring is rotatably fitted to an inner peripheral portion of an outer ring via a steel ball, a plurality of split members are fastened with fastening members such as bolts to form a ring shape. Which is a member molded into, an inner ring dividing member having a groove extending in the circumferential direction of the outer peripheral surface thereof, and a U-shaped groove having a ring shape and extending in the circumferential direction of the outer peripheral surface,
An inner ring having an inner ring rolling surface ring fitted into the groove of the inner ring split member and fastened to the inner ring split member by a fastening member such as a bolt, and a plurality of split members for fastening the bolt or the like. A member which is fastened with a member and formed in a ring shape, which has an outer ring dividing member having a groove extending in the circumferential direction of the inner peripheral surface thereof and a U-shaped member having a ring shape and extending in the circumferential direction of the outer peripheral surface. Has a groove,
A slewing bearing, comprising: an outer ring having the outer ring split member fitted in a groove of the outer ring split member and an outer ring rolling surface ring fastened with a fastening member such as a bolt.