A raceway temperature-controlled slewing bearing and lubrication fixture

Abstract

This utility model discloses a raceway temperature-controlled slewing bearing and a lubrication fixture, relating to the field of temperature-controlled slewing bearing technology. It includes an outer ring and an inner ring, with rolling elements installed between them. A countersunk hole is formed in the outer ring, and a temperature sensor is installed within the countersunk hole, with the sensor's detection end facing the rolling element. A 2mm metal layer is provided between the sensor's detection end and the rolling element. A dust cover is installed on the side of the temperature sensor facing away from the rolling element; the dust cover is detachably mounted on the outer ring and restricts the temperature sensor within the countersunk hole. A sealing strip assembly is also installed between the outer and inner rings, symmetrically distributed on the upper and lower sides of the rolling element. This invention addresses the technical problem of uneven grease distribution within the raceway when the slewing bearing operates on a slope, causing a rapid temperature rise in unlubricated sections of the raceway, leading to carbonization of the separator blocks, raceway corrosion, and other damage to the raceway.

Description

Technical Field

[0001] This utility model relates to the field of temperature-controlled slewing bearing technology, specifically a raceway temperature-controlled slewing bearing and a lubrication tool. Background Technology

[0002] Slewing bearings, as essential basic components of engineering and construction machinery, are crucial force transmission elements for any machine that requires relative rotation between two parts and needs to withstand axial forces, radial forces, and overturning moments. Slewing bearings are classified according to their structural type as follows: single-row ball bearing, three-row column bearing, crossed roller bearing, and double-row eight-point contact ball bearing.

[0003] The slewing bearings used in excavators are mainly single-row ball bearings. The frequent rotation of these bearings due to excavator operation causes the raceway temperature to gradually rise. Especially when working on slopes, uneven grease distribution within the raceway can cause a rapid temperature increase in unlubricated sections, leading to carbonization of the spacer blocks, raceway corrosion, and other damage. Reference to existing technology CN202510026687.4, a method for adding plastic oil to a slewing bearing and its internal components, involves internally filling spacers containing plastic that melts and overflows at high temperatures. However, it does not describe temperature detection and overflow control. Therefore, a new type of slewing bearing structure is needed to improve raceway lubrication performance, reduce raceway temperature, and significantly extend the service life of the slewing bearing raceway. Utility Model Content

[0004] The purpose of this invention is to design a novel slewing bearing structure. By using a temperature sensor built into the raceway of the slewing bearing, the temperature changes in different areas of the raceway can be monitored in real time. When the local temperature rises sharply, the internal grease can be automatically circulated to reduce the raceway temperature, thereby extending the service life of the raceway and reducing the cost of manual grease application.

[0005] This utility model provides the following technical solution:

[0006] A raceway temperature-controlled slewing bearing includes an outer ring and an inner ring, with rolling elements installed between the outer ring and the inner ring;

[0007] The outer ring has a countersunk hole, and a temperature sensor is installed in the countersunk hole, with the detection end of the temperature sensor facing the rolling element.

[0008] A 2mm metal layer is provided between the sensing end of the temperature sensor and the rolling element;

[0009] A dust cover is installed on the side of the temperature sensor facing away from the rolling element. The dust cover is suitable for closing and can be detachably installed on the outer ring, and restricts the temperature sensor inside the countersunk hole.

[0010] A sealing strip assembly is also installed between the outer ring and the inner ring, and is symmetrically distributed on the upper and lower sides of the rolling element.

[0011] In a further technical solution, the outer ring is provided with at least two sets of threaded holes outside the countersunk hole, and multiple sets of threaded holes are symmetrically arranged on both sides of the countersunk hole.

[0012] A fixing screw is installed on the threaded hole, and the screw body passes through the dust cover and is threaded into the threaded hole.

[0013] In a further technical solution, the sealing strip group includes an MT-type sealing strip, an O-type sealing strip, and a Y-type sealing strip, with the O-type sealing strip located between the MT-type sealing strip and the Y-type sealing strip.

[0014] In a further technical solution, a Y-type sealing strip is installed on the side of the O-type sealing strip facing the rolling element.

[0015] In a further technical solution, the inner ring and the outer ring are both provided with mounting slots facing each other. The two sets of mounting slots are suitable for being set on both sides of the O-ring seal and are suitable for the installation of the O-ring seal.

[0016] A lubrication tool for a raceway temperature-controlled slewing bearing includes the aforementioned raceway temperature-controlled slewing bearing, and eight sets of countersunk holes are provided on the raceway temperature-controlled slewing bearing, and the eight sets of countersunk holes are evenly distributed circumferentially along the outer ring axis.

[0017] Oil filling hole and oil outlet hole are provided in the raceway temperature-controlled slewing bearing;

[0018] It also includes an oil pipe and a grease tank, with the filling port and the outlet port connected to the grease tank via the oil pipe; the grease tank includes an oil storage chamber and an electrically controlled oil pump, which is connected to the oil storage chamber and the oil pipe respectively.

[0019] In a further technical solution, two sets of oil filling holes and two sets of oil outlet holes are respectively opened on the raceway temperature-controlled slewing bearing. The two sets of oil filling holes are distributed at 180°, and the two sets of oil outlet holes are distributed at 180°. Adjacent oil filling holes and oil outlet holes are at 90°, and the oil filling holes and oil outlet holes are arranged in the same circle.

[0020] Compared to traditional slewing bearings, raceway temperature-controlled slewing bearings have eight additional temperature sensors located inside the raceway and an external automatic grease-adding device.

[0021] Working principle of raceway temperature-controlled slewing bearing: As the slewing bearing rotates, the temperature inside the raceway gradually increases. When the slewing bearing is in a horizontal position, the temperature difference between the eight temperature sensors inside the raceway should be within ±3℃. When the slewing bearing is in an inclined position, due to gravity, the grease inside will flow to the lower areas, leaving the raceways at higher elevations without grease lubrication, causing a rapid temperature increase. At this time, the temperature difference between the eight temperature sensors inside the raceway can even reach over 20℃. When any sensor detects a temperature 10℃ higher than the average, the electronically controlled oil pump starts. At this time, the automatic grease filling device located outside the slewing bearing will automatically operate, and grease from the external grease tank will enter the raceway through the two filling holes. Excess grease will return to the grease tank through the oil outlet.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] The automatic operation of this slewing bearing and lubrication device significantly improves the lubrication performance of the slewing bearing, thereby reducing the raceway temperature during operation. This avoids damage to the raceway caused by forgetting to add grease, leading to high temperatures, carbonization of the spacer blocks, and raceway corrosion, thus extending the service life of the slewing bearing. It also reduces the time cost of manually adding grease each time the slewing bearing has been in operation for a certain period.

[0024] This invention employs a three-layer sealing structure consisting of an MT-type sealing strip, an O-type sealing strip, and a Y-type sealing strip to ensure that the grease inside the raceway returns to the grease tank through the oil outlet under certain pressure, rather than overflowing from the sealing strip into the raceway core. Mounting grooves are machined on the inner outer circle and the inner hole of the outer ring at the O-type sealing strip mounting position, which can axially fix the O-type sealing strip and prevent it from shifting, thus reducing sealing performance.

[0025] The temperature sensor's measuring head is placed close to the core of the raceway. There is also a 2mm metal layer inside the probe and raceway to prevent grease from the raceway from getting on the probe and affecting the accuracy of temperature detection.

[0026] The two oil filling holes and two oil outlet holes are placed symmetrically at 180°, which allows the grease in the raceway to flow completely and fully lubricate the raceway. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a half-sectional view of the slewing bearing of this utility model;

[0029] Figure 2 for Figure 1 Enlarged view of part A;

[0030] Figure 3 for Figure 1 Enlarged view of part B;

[0031] Figure 4 This is a schematic diagram of the slewing bearing and lubrication device of this utility model;

[0032] Figure 5 This is a schematic diagram of the internal structure of the grease tank of this utility model.

[0033] In the diagram: 1. Fixing screw; 2. Dust cover; 3. Threaded hole; 4. Temperature sensor; 5. Outer ring; 6. MT type sealing strip; 7. O-ring sealing strip; 8. Y type sealing strip; 9. Rolling element; 10. Inner ring; 11. Countersunk hole;

[0034] 12. Metal layer; 13. Mounting slot; 14. Filling hole; 15. Oil outlet; 16. Oil pipe; 17. Grease tank; 18. Electronic oil pump; 19. Oil storage chamber. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0036] The application principle of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] Please see Figure 1-3 As one embodiment of this utility model, a raceway temperature-controlled slewing bearing includes an outer ring 5 and an inner ring 10, with a rolling element 9 installed between the outer ring 5 and the inner ring 10; the rolling element is installed at the raceway core.

[0039] The outer ring 5 has a countersunk hole 11, and a temperature sensor 4 is installed in the countersunk hole 11, with the detection end of the temperature sensor 4 facing the rolling body 9.

[0040] A 2mm metal layer 12 is provided between the detection end of the temperature sensor 4 and the rolling element 9; the 2mm metal layer is a reserved outer ring structure or a metal structure installed here.

[0041] A dust cover 2 is installed on the side of the temperature sensor 4 facing away from the rolling element 9. The dust cover 2 is suitable for closing and is detachably installed on the outer ring 5, and restricts the temperature sensor 4 within the countersunk hole 11.

[0042] A sealing strip assembly is also installed between the outer ring 5 and the inner ring 10, and is symmetrically distributed on the upper and lower sides of the rolling element 9.

[0043] like Figure 1 As shown, the outer ring 5 has at least two sets of threaded holes 3 outside the countersunk hole 11, and multiple sets of threaded holes 3 are symmetrically arranged on both sides of the countersunk hole 11; in this embodiment, there are two sets of threaded holes. A fixing screw 1 is installed on the threaded hole 3, and the body of the fixing screw 1 passes through the dust cover plate 2 and is threaded into the threaded hole 3.

[0044] like Figure 1 As shown, the sealing strip assembly includes an MT-type sealing strip 6, an O-type sealing strip 7, and a Y-type sealing strip 8, with the O-type sealing strip 7 located between the MT-type sealing strip 6 and the Y-type sealing strip 8. The Y-type sealing strip 8 is installed on the side of the O-type sealing strip 7 facing the rolling element 9.

[0045] like Figure 2 As shown, the inner ring 10 and the outer ring 5 are both provided with mounting slots 13 facing each other. The two sets of mounting slots 13 are suitable for being set on both sides of the O-ring seal 7 and are suitable for the installation of the O-ring seal 7.

[0046] Mounting grooves are machined on the outer circle of the inner ring and the inner hole of the outer ring at the installation position of the O-ring. This can fix the O-ring in the axial direction and prevent the O-ring from moving and causing a decrease in sealing performance.

[0047] This utility model adopts a three-layer sealing structure of MT-type sealing strip, O-type sealing strip and Y-type sealing strip to ensure that the grease inside the raceway will return to the grease tank through the oil outlet under certain pressure, instead of overflowing from the sealing strip. In this embodiment, when installed on the equipment, the outer ring is fixed and the inner ring rotates relative to it. When working on an inclined plane, it is ensured that the outer ring can continuously supply oil to the core of the raceway.

[0048] In this embodiment, a raceway temperature-controlled slewing bearing is used. Eight evenly distributed countersunk holes and threaded holes are machined on the outer circumference of the outer ring. The temperature sensor is fixed to the countersunk hole through the threaded hole. The temperature sensor's measuring head is flush against the raceway core, which is where the rolling elements, which can be steel balls, are installed. The temperature sensor probe is not directly connected to the inside of the raceway; there is a 2mm metal layer between the probe and the raceway interior to prevent grease from the raceway interior from contaminating the probe and affecting the accuracy of temperature detection.

[0049] Example 2

[0050] like Figure 4 and 5As shown, another embodiment of the present invention is provided. Based on embodiment 1, a lubrication tool for a raceway temperature-controlled slewing bearing includes the aforementioned raceway temperature-controlled slewing bearing, and eight sets of countersunk holes 11 are provided on the raceway temperature-controlled slewing bearing. The eight sets of countersunk holes 11 are evenly distributed circumferentially along the outer ring 5 axis and are arranged in a circular manner.

[0051] An oil filling hole 14 and an oil outlet hole 15 are provided inside the raceway temperature-controlled slewing bearing;

[0052] It also includes an oil pipe 16 and a grease tank 17. The oil filling port 14 and the oil outlet port 15 are connected to the grease tank 17 via the oil pipe 16. The grease tank 17 includes an oil storage chamber 19 and an electrically controlled oil pump 18, which is connected to both the oil storage chamber 19 and the oil pipe 16. Figure 5 As shown, the electronically controlled oil pump has two sets, each connected to the oil line pipe of the filler port and the oil line pipe of the outlet port, respectively. Both sets of electronically controlled oil pumps are connected to the oil storage chamber. The electronically controlled oil pump used for filling draws the grease out of the oil storage chamber, while the electronically controlled oil pump used for returning grease pumps the grease back into the oil storage chamber.

[0053] like Figure 4 As shown, two sets of oil filling holes 14 and two sets of oil outlet holes 15 are respectively provided on the raceway temperature-controlled slewing bearing. The two sets of oil filling holes 14 are arranged at 180° intervals, and the two sets of oil outlet holes 15 are arranged at 180° intervals. Adjacent oil filling holes 14 and oil outlet holes 15 are at 90° intervals, and the oil filling holes 14 and oil outlet holes 15 are arranged in a cocircular circle. The two oil filling holes and two oil outlet holes are symmetrically placed at 180° intervals, which can make the grease in the raceway flow completely and fully lubricate the raceway.

[0054] The external automatic grease filling device of the slewing bearing consists of two filling pipes, two outlet pipes, and a grease tank. When the temperature inside the raceway is too high, the oil pump in the grease tank will start, and grease will be transported into the raceway through the two filling pipes. Excess grease inside the raceway will return to the grease tank through the outlet pipes.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A raceway temperature-controlled slewing bearing, comprising an outer ring (5) and an inner ring (10), wherein a rolling element (9) is installed between the outer ring (5) and the inner ring (10); Its features are, A countersunk hole (11) is provided in the outer ring (5), and a temperature sensor (4) is installed in the countersunk hole (11); A 2mm metal layer (12) is provided between the detection end of the temperature sensor (4) and the rolling element (9); A dust cover (2) is installed on the side of the temperature sensor (4) facing away from the rolling body (9). The dust cover (2) is detachably installed at the opening end of the countersunk hole (11). A sealing strip assembly is also installed between the outer ring (5) and the inner ring (10), and is symmetrically distributed on the upper and lower sides of the rolling element (9).

2. The raceway temperature-controlled slewing bearing according to claim 1, characterized in that, The outer ring (5) has at least two sets of threaded holes (3) outside the countersunk hole (11), and the multiple sets of threaded holes (3) are symmetrical on both sides of the countersunk hole (11); A fixing screw (1) is installed on the threaded hole (3), and the body of the fixing screw (1) passes through the dust cover (2) and is threaded into the threaded hole (3).

3. The raceway temperature-controlled slewing bearing according to claim 1, characterized in that, The sealing strip assembly includes an MT-type sealing strip (6), an O-type sealing strip (7), and a Y-type sealing strip (8), with the O-type sealing strip (7) located between the MT-type sealing strip (6) and the Y-type sealing strip (8).

4. A raceway temperature-controlled slewing bearing according to claim 3, characterized in that, A Y-type sealing strip (8) is installed on the side of the O-type sealing strip (7) facing the rolling element (9).

5. A raceway temperature-controlled slewing bearing according to claim 1, characterized in that, The inner ring (10) and the outer ring (5) are provided with mounting slots (13) facing each other. The two sets of mounting slots (13) are suitable for being set on both sides of the O-ring seal (7) and are used for the installation of the O-ring seal (7).

6. A lubrication fixture for a raceway temperature-controlled slewing bearing, characterized in that, The bearing includes the raceway temperature-controlled slewing bearing as described in claim 5, and has 8 sets of countersunk holes (11) provided on the raceway temperature-controlled slewing bearing, and the 8 sets of countersunk holes (11) are evenly distributed circumferentially along the outer ring (5) axis. An oil filling hole (14) and an oil outlet hole (15) are provided inside the raceway temperature-controlled slewing bearing; It also includes an oil pipe (16) and a grease tank (17). The oil filling hole (14) and the oil outlet hole (15) are both connected to the grease tank (17) through the oil pipe (16). The grease tank (17) includes an oil storage chamber (19) and an electric oil pump (18). The electric oil pump (18) is connected to the oil storage chamber (19) and the oil pipe (16) respectively.

7. The lubrication fixture for a raceway temperature-controlled slewing bearing according to claim 6, characterized in that, Two sets of oil filling holes (14) and two sets of oil outlet holes (15) are respectively provided on the raceway temperature-controlled slewing bearing. The two sets of oil filling holes (14) are arranged at 180° and the two sets of oil outlet holes (15) are arranged at 180°. Adjacent oil filling holes (14) and oil outlet holes (15) are at 90°, and the oil filling holes (14) and oil outlet holes (15) are arranged in the same circle.

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