Slewing bearing and slewing work equipment

Abstract

The present application relates to slewing bearing, to solve the problem of the existing slewing bearing outer ring warping, the gap between the outer ring and the sealing ring is easy to produce, which leads to the sealing failure, the present application constructs a kind of slewing bearing and slewing operation equipment, slewing bearing, including inner ring, outer ring rotationally installed in the radial outer side of inner ring, first sealing ring, the radial outer side of the inner ring is flush with the bottom surface of outer ring at the position, and sealing groove around the inner ring is arranged, the first sealing ring is fixed to the bottom surface of the outer ring, the radial inner side end of first sealing ring has the elastic extension part extending upwards and downwards, and the upper and lower ends of the elastic extension part are in the sealing groove and elastically contact with the wall surface of sealing groove.In the present application, when the outer ring deviates from the center and warps relative to the inner ring, the contact between one end of the upper and lower ends of the elastic extension part and the inner ring is strengthened due to the upward movement of the outer ring, so that the sealing of the first sealing ring is always effective.

Description

Technical Field

[0001] This invention relates to a slewing bearing, and more specifically, to a slewing bearing and a slewing working device. Background Technology

[0002] Slewing work equipment such as excavators, cranes, and aerial work platforms all have slewing bearings to support slewing platforms capable of rotation. A slewing bearing consists of an inner ring and an outer ring. The outer ring is radially outer of the inner ring via ball bearings. The ball raceway between the outer and inner rings is filled with lubricating grease. To prevent grease leakage and external dust from entering the gap between the inner and outer rings, a sealing ring is installed between them. In existing slewing bearings, such as... Figure 1 As shown, the sealing ring is usually fixed to the inner ring, and the radially outer end of the sealing ring extends to the bottom of the outer ring, using its elasticity to fit against the bottom surface of the radially outer side.

[0003] There are gaps between the inner and outer rings and the balls. When the outer ring of the slewing bearing is subjected to an overturning moment, the outer ring will warp relative to the inner ring. That is, a certain point on the outer ring will rise relative to the inner ring, while a point symmetrical to that point will fall. When the warping displacement of the outer ring exceeds the compression of the seal ring, a gap will be created between the outer ring and the seal ring. Grease in the ball raceway will leak out from the gap between the seal ring and the outer ring. Especially when the outer ring of the slewing bearing is subjected to alternating forces, a "breathing" phenomenon will occur between the seal ring and the outer ring, resulting in oil leakage. As the seal strip ages, this oil leakage becomes more obvious.

[0004] Some slewing machines operate under harsh conditions. For example, when an excavator is working in gold mining conditions, the entire slewing bearing is immersed in mud. When the seal ring and the outer ring are not sealed tightly or "breathing" occurs, mud and other debris will enter the ball bearing raceway, affecting the service life of the slewing bearing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that when the outer ring of the existing slewing bearing warps, a gap is easily generated between the outer ring and the sealing ring, which leads to sealing failure. The present invention provides a slewing bearing and a slewing operation device.

[0006] The technical solution of the present invention to achieve its purpose is as follows: a slewing bearing is constructed, including an inner ring, an outer ring rotatably mounted radially outside the inner ring, and a first sealing ring. A sealing groove surrounding the inner ring is provided on the radially outer surface of the inner ring at a position flush with the bottom surface of the outer ring. The first sealing ring is fixed to the bottom surface of the outer ring. The radially inner end of the first sealing ring has an elastic extension portion extending upward and downward. The upper and lower ends of the elastic extension portion are in the sealing groove and elastically fit and contact the wall surface of the sealing groove.

[0007] In this invention, the part of the first sealing ring that contacts the inner ring is an elastic extension that extends vertically. The length of the elastic extension can be set as needed. When the outer ring warps off-center relative to the inner ring, the contact between one end of the elastic extension and the inner ring weakens or even disengages, while the contact between the other end and the inner ring strengthens, always maintaining close contact, so that the sealing of the first sealing ring is always effective.

[0008] In the slewing bearing of the present invention, the upper and lower ends of the elastic extension elastically abut against the upper and lower side walls of the sealing groove, respectively. Furthermore, the elastic extension elastically bends into an arc shape away from the inner ring.

[0009] In the slewing bearing of the present invention, the upper side wall and the lower side wall of the sealing groove are inclined surfaces that slope upward and downward, respectively, and the width of the opening of the sealing groove is greater than the width of the bottom of the groove.

[0010] In the slewing bearing of the present invention, the bottom of the sealing groove is provided with at least one groove surrounding the inner ring, and a second sealing ring is installed in each groove, and each second sealing ring elastically abuts against the radial inner side of the elastic extension.

[0011] In the slewing bearing of this invention, the bottom of the sealing groove has two grooves arranged at an interval. Further, the two grooves are equidistant from the center of the bottom of the sealing groove. The first sealing ring and the second sealing ring divide the sealing groove on the inner ring into multiple sealed cavities. The entire sealing groove forms a labyrinthine cavity, thereby achieving a sealing effect.

[0012] In the slewing bearing of the present invention, the bottom surface of the outer ring is provided with a groove surrounding the center of the outer ring, and the first sealing ring has an insert portion that is embedded in the groove. Alternatively, a pressure plate can be detachably mounted on the bottom surface of the outer ring, and the radially outer end of the first sealing ring is embedded between the pressure plate and the bottom surface of the outer ring.

[0013] The technical solution of the present invention to achieve its purpose is as follows: to construct a rotary working device having the aforementioned rotary bearing.

[0014] Compared with the prior art, in this invention, when the outer ring warps off-center relative to the inner ring, the contact between one end of the elastic extension and the inner ring is strengthened due to the upward movement of the outer ring, so that the sealing of the first sealing ring is always effective. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the sealing structure between the inner and outer rings of an existing slewing bearing.

[0016] Figure 2This is a schematic cross-sectional view of the slewing bearing of the present invention.

[0017] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0018] Figure 4 yes Figure 3 A magnified view of a section at point B.

[0019] Figure 5 This is a schematic diagram of the structure of the inner ring of the slewing bearing of the present invention.

[0020] Figure 6 This is a schematic diagram of the structure of the first sealing ring of the present invention.

[0021] Figure 7 yes Figure 6 A magnified view of a section at point C.

[0022] Component names and serial numbers in the diagram:

[0023] Inner ring 10, sealing groove 11, groove bottom wall 111, groove upper side wall 112, groove lower side wall 113, groove 114, ball groove 12.

[0024] Outer ring 20, card slot 21.

[0025] Ball bearing 30.

[0026] First sealing ring 40, elastic extension 41, insert 42, radial inner surface 43.

[0027] Second sealing ring 50. Detailed Implementation

[0028] The specific implementation plan is described below with reference to the attached diagram.

[0029] like Figure 2 As shown, in this embodiment, the slewing bearing includes an inner ring 10, an outer ring 20 rotatably mounted on the radially outer side of the inner ring 10, and a first sealing ring 40. A ball groove 12 is provided on the radially outer side of the inner ring 10. The ball groove 12 on the inner ring 10 and the ball groove on the radially inner side of the outer ring 20 combine to form a raceway for the rolling of the balls 30, and allow the outer ring 20 to be rotatably mounted on the inner ring 10.

[0030] like Figures 3 to 5 As shown, a sealing groove 11 encircling the inner ring is provided on the radially outer side of the inner ring 10 at a position flush with the bottom surface of the outer ring 20. Two grooves 114 encircling the inner ring are provided on the bottom wall 111 of the sealing groove 11. The two grooves 114 are arranged vertically at intervals, and a second sealing ring 50 is installed in each groove 114. Preferably, the second sealing ring 50 is O-shaped. The two grooves 114 are equidistant from the center of the bottom of the sealing groove 11.

[0031] In some embodiments, the number of grooves 114 may be one or three.

[0032] The upper side wall 112 and the lower side wall 113 of the sealing groove 11 are inclined surfaces that slope upward and downward, respectively, and the width of the groove opening of the sealing groove 11 is greater than the width of the groove bottom.

[0033] The first sealing ring 40 is fixed to the bottom surface of the outer ring 20, such as... Figure 3 Figure 4 As shown, a groove 21 surrounding the center of the outer ring 20 is provided on the bottom surface of the outer ring 20, and the first sealing ring 40 has an insert portion 42 that is embedded in the groove 21. The insert portion 42 on the first sealing ring 40 is fitted into the groove 21 and is press-fitted with the groove 21, so that the first sealing ring 40 is fixedly installed at the bottom of the outer ring.

[0034] In some embodiments, the first sealing ring 40 can also be fixedly installed by detachably installing a pressure plate on the bottom surface of the outer ring 20, with the radially outer end of the first sealing ring 40 embedded between the pressure plate and the bottom surface of the outer ring. The pressure plate is fixed to the bottom of the outer ring, forming a groove with the bottom surface of the outer ring facing the center of the outer ring, and the radially outer end of the first sealing ring 40 is embedded in the groove, or the pressure plate clamps and fixes the radially outer end of the first sealing ring 40 to the bottom surface of the outer ring.

[0035] like Figure 4 Figure 6 Figure 7 As shown, the radially inner end of the first sealing ring 40 has an upwardly and downwardly extending elastic extension 41. The upper and lower ends of the elastic extension 41 are within the sealing groove 11 and elastically contact the wall surface of the sealing groove 11. Preferably, the upper and lower ends of the elastic extension 41 elastically abut against the upper side wall surface 112 and the lower side wall surface 113 of the sealing groove 11, and the elastic extension 41 is elastically bent into an arc shape away from the inner ring 10.

[0036] like Figure 4 As shown, each of the second sealing rings 50 installed at the bottom of the sealing groove 11 elastically abuts against the radially inner surface 43 of the elastic extension 41. The first sealing ring 40 and the second sealing ring 50 divide the sealing groove 11 of the inner ring 10 into multiple sealed cavities. The entire sealing groove 11 forms a labyrinthine cavity, thereby achieving a sealing effect.

[0037] Elastic contact refers to the elastic deformation of at least one of the two contacting components, resulting in a certain amount of pre-compression.

[0038] In this embodiment, the portion of the first sealing ring 40 that contacts the inner ring 10 is an elastic extension 41 extending axially in both the upper and lower directions. The length of the elastic extension 41 can be set as needed. When the outer ring 20 warps off-center relative to the inner ring 10, the contact between one end of the elastic extension 41 and the inner ring 10 weakens or even disengages, but the contact between the other end and the upper side wall 112 or lower side wall 113 of the sealing groove 11 is strengthened, maintaining a close contact, thereby ensuring that the seal of the first sealing ring 40 is always effective.

[0039] This embodiment also provides a slewing machine having the aforementioned slewing bearing. The slewing machine can be an excavator, a crane, etc., or it can be a grader. On a grader, the slewing bearing is used to mount the blade holder of the working device.

Claims

1. A slewing bearing, comprising an inner ring, an outer ring rotatably mounted radially outside the inner ring, and a first sealing ring, characterized in that, A sealing groove is provided on the radially outer surface of the inner ring at a position flush with the bottom surface of the outer ring. The first sealing ring is fixed to the bottom surface of the outer ring. The radially inner end of the first sealing ring has an elastic extension portion extending upward and downward. The upper and lower ends of the elastic extension portion are in the sealing groove and elastically fit and contact the wall surface of the sealing groove. The bottom of the sealing groove is provided with at least one groove surrounding the inner ring. A second sealing ring is installed in each groove. Each second sealing ring elastically abuts against the radially inner surface of the elastic extension portion.

2. The slewing bearing according to claim 1, characterized in that, The upper and lower ends of the elastic extension elastically abut against the upper and lower side walls of the sealing groove.

3. The slewing bearing according to claim 2, characterized in that, The elastic extension bends elastically into an arc shape away from the inner circle.

4. The slewing bearing according to claim 2 or 3, characterized in that, The upper and lower side walls of the sealing groove are inclined surfaces that slope upwards and downwards, respectively, and the width of the groove opening is greater than the width of the groove bottom.

5. The slewing bearing according to claim 1, characterized in that, The bottom of the sealing groove is provided with two grooves, which are arranged vertically at intervals.

6. The slewing bearing according to claim 5, characterized in that, The two grooves are arranged equidistantly from the center of the bottom of the sealing groove.

7. The slewing bearing according to claim 1, characterized in that, The bottom surface of the outer ring is provided with a groove surrounding the center of the outer ring, and the first sealing ring has an insert portion that is embedded in the groove.

8. The slewing bearing according to claim 1, characterized in that, A pressure plate is detachably mounted on the bottom surface of the outer ring, and the radially outer end of the first sealing ring is embedded between the pressure plate and the bottom surface of the outer ring.

9. A rotary working device, characterized in that, A slewing bearing having any one of claims 1 to 8.

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