CN115539502A - High-speed transmission oil floating type slewing bearing - Google Patents

High-speed transmission oil floating type slewing bearing Download PDF

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Publication number
CN115539502A
CN115539502A CN202211135690.2A CN202211135690A CN115539502A CN 115539502 A CN115539502 A CN 115539502A CN 202211135690 A CN202211135690 A CN 202211135690A CN 115539502 A CN115539502 A CN 115539502A
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CN
China
Prior art keywords
inner ring
hydraulic oil
oil inlet
outer ring
annular grooves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211135690.2A
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Chinese (zh)
Inventor
汪加友
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Yuanfeng Slewing Rings Co ltd
Original Assignee
Anhui Yuanfeng Slewing Rings Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Yuanfeng Slewing Rings Co ltd filed Critical Anhui Yuanfeng Slewing Rings Co ltd
Priority to CN202211135690.2A priority Critical patent/CN115539502A/en
Publication of CN115539502A publication Critical patent/CN115539502A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/10—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F16C19/522—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to load on the bearing, e.g. bearings with load sensors or means to protect the bearing against overload
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings

Abstract

The application provides a high-speed transmission oil floating type slewing bearing, wherein a hydraulic oil inlet channel is arranged in an inner ring, a radial inward projection on an outer ring covers an oil outlet hole of the hydraulic oil inlet channel, an annular groove is arranged on the inner ring, the oil outlet hole is positioned between two annular grooves, and three annular grooves on the outer ring and two annular grooves on the inner ring form a male-female clearance fit; high-pressure hydraulic oil enters from the oil inlet hole of the inner ring, comes out from the upper end face and directly acts in the annular groove of the outer ring, the outer ring floats upwards under the action of an upward acting force, and the pressure of the hydraulic oil pump can be adjusted when the slewing bearing bears a static pressure load; the integral copper retainer is adopted to replace a single nylon isolating block, so that rolling controllability of the rolling ball is realized; the oil floating structure offsets most axial force of the rolling ball, reduces abrasion of the rolling ball, structurally prolongs service life, improves manufacturing precision in manufacturing technology, achieves movement accuracy and achieves application to high-speed rotary transmission machinery.

Description

High-speed transmission oil floating type slewing bearing
Technical Field
The invention belongs to the technical field of slewing bearings, and particularly relates to a high-speed transmission oil-floating type slewing bearing.
Background
The slewing bearing can bear a large axial load and a large overturning moment, and is generally applied to engineering machinery rotating at low speed, such as excavators, tower cranes, port hoisting machinery and the like. The slewing bearing integrates the rotation of the bearing and the transmission of the gear, integrates the original bearing, a bearing seat, a main shaft and the gear into a whole, greatly simplifies and optimizes the design and manufacturing work, and is widely applied to low-speed slewing engineering machinery, welding machinery, filling machinery and polishing machinery.
However, the existing slewing bearing (taking the diameter of the center of the raceway as an example of 1000 mm) can only be used on equipment which is slewed at a low speed (the designed rotating speed is 3 rpm), and is not suitable for high-speed slewing (50 rpm) because: (1) The rolling steel ball has larger abrasion under the action of larger axial load; (2) The motion of the rolling steel balls in the roller path not only rolls, but also slides, and additional impact exists, the steel balls are buffered by nylon isolation blocks, and the nylon isolation blocks are easy to crack under the action of the additional impact; (3) The existing slewing bearing is low in manufacturing precision, the raceway is formed by turning and is not ground, so that the axial and radial gaps are large, the runout is large, and the vibration is large during high-speed transmission; (4) The gear teeth are not ground after heat treatment, so that the pitch circle runout is large, accurate and stable transmission cannot be realized, and large additional impact force exists during high-speed rotation.
Disclosure of Invention
The invention aims to provide a high-speed transmission oil floating type slewing bearing, which is used for realizing the application of the slewing bearing (taking the diameter of the center of a raceway as 1000mm as an example) on high-speed (50 rpm) transmission mechanical equipment, such as a vertical lathe.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a high-speed transmission oil floating type slewing bearing comprises an inner ring, an outer ring and a rolling ball, wherein at least two hydraulic oil inlet channels for flowing hydraulic oil are arranged in the inner ring, oil inlet holes of the hydraulic oil inlet channels are formed in the inner diameter surface of the inner ring, and oil outlet holes of the hydraulic oil inlet channels are formed in the upper end surface of the inner ring;
a radial inward protrusion is arranged on the outer ring, the lower surface of the radial inward protrusion covers an oil outlet hole of a hydraulic oil inlet duct on the inner ring, and a gap is reserved between the lower surface of the radial inward protrusion and the upper end surface of the inner ring;
the upper end surface of the inner ring is provided with two annular grooves, and an oil outlet of the hydraulic oil inlet duct is positioned between the two annular grooves on the inner ring;
the lower surface of the radial inward protrusion is provided with three annular grooves, and the three annular grooves on the outer ring and the two annular grooves on the inner ring form a male-female clearance fit.
Preferably, all the hydraulic oil inlet duct channels are uniformly distributed on the inner ring along the circumferential direction;
the hydraulic oil inlet duct is composed of a horizontal hole and a vertical hole, and the horizontal hole is communicated with the vertical hole to form a duct.
Preferably, the high-speed transmission oil-floating type slewing bearing further comprises a copper retainer and a retainer baffle ring, the rolling balls are embedded into holes formed in the copper retainer, the retainer baffle ring is used for supporting the copper retainer and preventing the copper retainer from being separated, and the retainer baffle ring is arranged at the corners of the inner diameter surface and the lower end face of the outer ring.
The application provides a high-speed transmission oil floating type slewing bearing, wherein at least two hydraulic oil inlet channels for flowing hydraulic oil are arranged in an inner ring, oil inlet holes of the hydraulic oil inlet channels are formed in the inner diameter surface of the inner ring, and oil outlet holes of the hydraulic oil inlet channels are formed in the upper end surface of the inner ring;
a radial inward protruding part is arranged on the outer ring, the lower surface of the radial inward protruding part covers an oil outlet hole of a hydraulic oil inlet duct on the inner ring, and a gap is reserved between the lower surface of the radial inward protruding part and the upper end surface of the inner ring;
the upper end surface of the inner ring is provided with two annular grooves, and an oil outlet hole of the hydraulic oil inlet duct is positioned between the two annular grooves on the inner ring;
the lower surface of the radial inward protrusion is provided with three annular grooves, and the three annular grooves on the outer ring and the two annular grooves on the inner ring form a male-female clearance fit;
the preparation method of the high-speed transmission oil-floating type slewing bearing comprises ring rolling forming, machining, quenching and tempering, grinding and finished product assembling, wherein the hardness of a raceway subjected to quenching and tempering is 58-62HRC through optimizing process steps and process parameters, the thickness of a quenched hardened layer of the raceway is not less than 5mm, the hardness of a tooth surface and a tooth root subjected to quenching and tempering is 50-60HRC, the thickness of the quenched hardened layer of the tooth surface is not less than 3.2mm, the thickness of the quenched hardened layer of the tooth root is not less than 1.2mm, the axial clearance and the radial clearance of an inner ring raceway and an outer ring raceway are not more than 0.02mm, the axial runout and the radial runout are not more than 0.02mm, and the radial runout of a gear pitch circle relative to the raceway is not more than 0.03mm;
the high-pressure hydraulic oil enters from the oil inlet hole of the inner ring and comes out from the upper end face to directly act in the oil groove of the outer ring, the hydraulic oil flows out from the wave groove, the outer ring floats upwards under the action of upward force, and when the slewing bearing bears static pressure load, the pressure of a high-pressure hydraulic oil pump is adjusted to ensure that the starting torque of the slewing bearing is not more than 30N.m;
the application adopts the integral copper retainer to replace a single nylon isolating block, thereby realizing rolling controllability of the rolling ball;
the application structurally prolongs the service life of the slewing bearing, meets the requirement of high-speed rotation, improves the manufacturing precision of the slewing bearing in the manufacturing process, and realizes the accuracy of movement, thereby realizing the application of the slewing bearing on high-speed slewing transmission mechanical equipment.
Drawings
FIG. 1 is a schematic cross-sectional view of a horizontally mounted high speed drive oil-floating slewing bearing according to an embodiment of the present application;
fig. 2 is an enlarged view of an area a where the oil floating structure in fig. 1 is located (showing that a hydraulic oil inlet duct, an oil inlet hole, an oil outlet hole, three annular grooves and two annular grooves in the oil floating structure form a male-female clearance fit in an enlarged manner).
In the figure: 1, an outer ring (with teeth), 2, a rolling ball, 3, an inner ring (without teeth), 4 mounting holes (threaded holes or unthreaded holes), 5 copper retainers, 6 retainer baffle rings, 7 oil inlet holes of a hydraulic oil inlet duct and 8 oil return ducts;
9. fixed base, 10 carousel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As in fig. 1-2: the oil-water separator comprises an outer ring 1 (with teeth), a rolling ball 2, an inner ring 3 (without teeth), a mounting hole (a threaded hole or a unthreaded hole) 4, a copper retainer 5, a retainer baffle ring 6, an oil inlet hole 7 of a hydraulic oil inlet duct and an oil return duct 8; a fixed base 9 and a rotating disc 10.
The application provides a high-speed transmission oil floating slewing bearing, including inner circle 3, outer lane 1 and spin 2, be provided with two at least hydraulic oil feed pore that are used for the hydraulic oil circulation in the inner circle 3, the inlet port trompil in hydraulic oil feed pore is in the internal diameter surface of inner circle 3, the outlet port trompil in hydraulic oil feed pore is in the up end of inner circle 3;
a radial inward protrusion is arranged on the outer ring 1, the lower surface of the radial inward protrusion covers an oil outlet hole of a hydraulic oil inlet duct on the inner ring 3, and a gap is reserved between the lower surface of the radial inward protrusion and the upper end surface of the inner ring 3;
two annular grooves are formed in the upper end face of the inner ring 3, and an oil outlet hole of the hydraulic oil inlet duct is located between the two annular grooves in the inner ring 3;
the lower surface of the radial inward protrusion is provided with three annular grooves, and the three annular grooves on the outer ring 1 and the two annular grooves on the inner ring 3 form a clearance fit in a male-female manner.
In one embodiment of the present application, all the hydraulic oil inlet ducts are uniformly distributed on the inner ring 3 along the circumferential direction;
the hydraulic oil inlet duct is composed of a horizontal hole and a vertical hole, and the horizontal hole is communicated with the vertical hole to form a duct.
In an embodiment of the application, the high-speed transmission oil-floating type slewing bearing further comprises a copper retainer 5 and a retainer baffle ring 6, the rolling balls 2 are embedded in holes formed in the copper retainer 5, the retainer baffle ring 6 is used for supporting the copper retainer 5 and preventing the copper retainer 5 from being separated, and the retainer baffle ring 6 is arranged at the corner of the inner diameter surface and the lower end face of the outer ring 1.
The application provides a preparation method of a high-speed transmission oil-floating type slewing bearing, which comprises the following steps of:
1) Forming a forge piece made of 42CrMo steel into an outer ring blank through ring rolling;
forming a 42CrMo steel forge piece into an inner ring blank through ring rolling;
2) Machining the outer ring blank prepared in the step 1) to obtain an outer ring semi-finished product;
machining the inner ring blank prepared in the step 1) to obtain a semi-finished inner ring product;
3) Quenching and tempering the outer ring semi-finished product and the inner ring semi-finished product, controlling the hardness of the roller path after quenching and tempering to be 58-62HRC, and controlling the thickness of a quenching and hardening layer of the roller path to be not less than 5mm;
controlling the hardness of the tooth surface and the tooth root after quenching and tempering treatment to be 50-60HRC, controlling the thickness of a quench-hardened layer of the tooth surface to be not less than 3.2mm, and controlling the thickness of the quench-hardened layer of the tooth root to be not less than 1.2mm;
4) Grinding: firstly, roughly grinding the raceway of the inner ring 3, the raceway of the outer ring 1, the mounting end face and the gear teeth, then performing stress relief annealing, and then respectively performing fine grinding processing to control the axial clearance and the radial clearance of the raceway of the inner ring and the raceway of the outer ring to be less than or equal to 0.02mm, the axial runout and the radial runout to be less than or equal to 0.02mm, and control the radial runout of a gear pitch circle relative to the raceways to be less than or equal to 0.03mm;
5) And (3) assembling a finished product: and assembling the inner ring 3, the outer ring 1 and the rolling ball 2 together to form the finished rotary bearing.
In this application, oil return pore 8 sets up in unable adjustment base 9, and oil return pore 8 is used for collecting and discharging the hydraulic oil that flows out from the oil floating structure, retrieves hydraulic oil and discharges from slewing bearing, then sends to the oil storage tank of hydraulic oil pump station.
The application provides a pair of high-speed transmission oil floats formula slewing bearing has realized the theory of operation of high-speed gyration:
(1) The oil floating structure is adopted in the structural design, so that the abrasion of the rolling steel ball is greatly reduced;
an oil floating structure: the upper end surface of the inner ring 3 is provided with 2 annular grooves, 6 oil outlets are uniformly distributed among the 2 annular grooves, and the outer ring 1 is provided with 3 annular grooves which form a male-female clearance fit with the 2 annular grooves of the inner ring 3;
the inner ring is internally provided with 6 hydraulic oil inlet channels, the inner diameter surface of the inner ring is provided with 6 oil inlet holes, the upper end surface of the inner ring is provided with 2 annular grooves, and 6 uniformly distributed oil outlet holes are formed among the 2 annular grooves;
the inner diameter direction of the outer ring is provided with flange steps (radial inward convex parts), and the lower surface of each flange step is provided with 3 annular grooves;
high-pressure hydraulic oil enters from an oil inlet 7 on the inner ring 3, exits from an oil outlet on the upper end face of the inner ring 3, directly acts on the surface of the annular groove in the middle of the outer ring, and then flows out from a gap between the annular groove between the inner ring 3 and the outer ring 1, the outer ring 1 floats upwards under the impact force of the high-pressure hydraulic oil, when the slewing bearing bears static pressure load, the pump pressure of the high-pressure hydraulic oil is adjusted, and the starting torque of the slewing bearing is not more than 30N.m;
(2) The integral copper retainer 5 is adopted to replace a single nylon spacer block, so that the rolling of the steel ball is controllable;
an integral copper retainer 5 is adopted, and the copper retainer 5 rotates along with the outer ring 1;
the steel ball is placed in a hole of the copper retainer, and when the slewing bearing moves, the steel ball not only rotates, but also revolves with the copper retainer;
(3) Grinding the raceway of the slewing bearing to realize accurate and stable transmission;
grinding the raceways of the inner ring 3 and the outer ring 1, and grinding the raceways of the inner ring 3 and the outer ring 1 after heat treatment to ensure that the axial gap and the radial gap between the raceways of the inner ring and the outer ring are less than or equal to 0.02mm and the axial run-out and the radial run-out are less than or equal to 0.02mm;
(4) Grinding the gear teeth on the outer ring, so that the precision grade of the gear teeth is improved, and the impact during high-speed transmission is eliminated;
the gear teeth are ground after heat treatment, the precision reaches 7 grades, and the radial runout of the pitch circle of the gear teeth relative to the raceway is ensured to be less than or equal to 0.03mm.
In the application, the thermal refining refers to a double heat treatment method of quenching and high-temperature tempering, and aims to enable a workpiece to have good comprehensive mechanical properties. High temperature tempering means tempering at 500-650 ℃. The quenching and tempering treatment can adjust the performance and the material quality of the steel to a great extent, and the steel has better strength, plasticity and toughness and good comprehensive mechanical properties. Tempering treatment is carried out to obtain tempered sorbite, and the tempered sorbite is formed by martensite during tempering.
In this application, the "inner" orientation is the same as the "inner" orientation in the inner ring, and the "outer" orientation is the same as the "outer" orientation in the outer ring.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (3)

1. A high-speed transmission oil floating type slewing bearing comprises an inner ring, an outer ring and a rolling ball and is characterized in that at least two hydraulic oil inlet channels for flowing hydraulic oil are arranged in the inner ring, oil inlet holes of the hydraulic oil inlet channels are formed in the inner diameter surface of the inner ring, and oil outlet holes of the hydraulic oil inlet channels are formed in the upper end surface of the inner ring;
a radial inward protrusion is arranged on the outer ring, the lower surface of the radial inward protrusion covers an oil outlet hole of a hydraulic oil inlet duct on the inner ring, and a gap is reserved between the lower surface of the radial inward protrusion and the upper end surface of the inner ring;
the upper end surface of the inner ring is provided with two annular grooves, and an oil outlet hole of the hydraulic oil inlet duct is positioned between the two annular grooves on the inner ring;
the lower surface of the radial inward protrusion is provided with three annular grooves, and the three annular grooves on the outer ring and the two annular grooves on the inner ring form a male-female clearance fit.
2. The high-speed transmission oil floating type slewing bearing of claim 1, wherein all the hydraulic oil inlet duct channels are uniformly distributed on the inner ring along the circumferential direction;
the hydraulic oil inlet duct is composed of a horizontal hole and a vertical hole, and the horizontal hole is communicated with the vertical hole to form a duct.
3. The high-speed transmission oil floating type slewing bearing of claim 1, wherein the high-speed transmission oil floating type slewing bearing further comprises a copper retainer and a retainer stop ring, the rolling balls are embedded in holes in the copper retainer, the retainer stop ring is used for supporting the copper retainer and preventing the copper retainer from being removed, and the retainer stop ring is arranged at corners of an inner diameter surface and a lower end surface of the outer ring.
CN202211135690.2A 2022-09-19 2022-09-19 High-speed transmission oil floating type slewing bearing Pending CN115539502A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211135690.2A CN115539502A (en) 2022-09-19 2022-09-19 High-speed transmission oil floating type slewing bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211135690.2A CN115539502A (en) 2022-09-19 2022-09-19 High-speed transmission oil floating type slewing bearing

Publications (1)

Publication Number Publication Date
CN115539502A true CN115539502A (en) 2022-12-30

Family

ID=84728019

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211135690.2A Pending CN115539502A (en) 2022-09-19 2022-09-19 High-speed transmission oil floating type slewing bearing

Country Status (1)

Country Link
CN (1) CN115539502A (en)

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