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CN115126790B - Bearing assembly and universal joint bearing device - Google Patents

Bearing assembly and universal joint bearing device Download PDF

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Publication number
CN115126790B
CN115126790B CN202211058715.3A CN202211058715A CN115126790B CN 115126790 B CN115126790 B CN 115126790B CN 202211058715 A CN202211058715 A CN 202211058715A CN 115126790 B CN115126790 B CN 115126790B
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China
Prior art keywords
oil seal
mounting hole
wall
mounting
shaft sleeve
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CN202211058715.3A
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Chinese (zh)
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CN115126790A (en
Inventor
高天芬
牛杰
叶连强
董小忠
赵珍
严国平
姜志恒
王珊
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Wanxiang Qianchao Co Ltd
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Wanxiang Qianchao Co Ltd
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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
    • F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
    • F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
    • F16D3/385—Bearing cup; Bearing construction; Bearing seal; Mounting of bearing on the intermediate member
    • 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
    • F16C33/583—Details of specific parts of races
    • 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
    • F16C33/64—Special methods of manufacture
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7809—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for needle roller bearings
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • 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
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
    • F16C2223/18—Hardening, e.g. carburizing, carbo-nitriding with induction hardening
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/60—Thickness, e.g. thickness of coatings

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention relates to the field of universal joints, in particular to a bearing assembly and a universal joint bearing device. The shaft sleeve is provided with a mounting hole, the shaft sleeve is processed by adopting a heat treatment process, a first quenching layer is formed on the hole wall of the mounting hole, a second quenching layer is formed on the outer side wall of the shaft sleeve, the thickness of the first quenching layer is set to be h1, the thickness of the second quenching layer is set to be h2, and the minimum value of the wall thickness of the hole wall of the mounting hole is L, wherein L & gt h1+ h2. The minimum value of the wall thickness of the hole wall of the mounting hole is larger than the sum of the first quenching layer and the second quenching layer, so that the problem of hard, brittle and cracked after heat treatment and full quenching is avoided. The shaft sleeve only needs heat treatment, and the annealing process of the opening end of the shaft sleeve can be cancelled, so that the production flow is shortened, and the manufacturing cost is reduced.

Description

Bearing assembly and universal joint bearing device
Technical Field
The invention relates to the field of universal joints, in particular to a bearing assembly and a universal joint bearing device.
Background
The universal joint bearing utilizes a ball-type connection to realize a mechanical structure of power transmission of different shafts, and is an important part of an automobile bearing. The universal joint bearing is provided with cross shafts and bearing assemblies arranged at end shafts of each cross shaft, each bearing assembly comprises a shaft sleeve, a dust cover arranged on the shaft sleeve, a rolling body and an oil seal, each shaft sleeve is provided with a mounting hole, each rolling body is arranged in each mounting hole, and each oil seal is located at the opening end of each mounting hole. The cross shaft is inserted from the mounting hole and is connected with the rolling body, and the oil seal is in sealing butt joint with the cross shaft so as to prevent lubricating grease from leaking.
In the related art, an inner limiting groove is cut in the hole wall of the mounting hole by the shaft sleeve, and the framework of the oil seal is clamped into the inner limiting groove after being bent. Meanwhile, a recessed outer limiting groove is formed in the outer side wall of the shaft sleeve, the shaft sleeve is sleeved with the dust cover, and the dust cover is partially buckled into the outer limiting groove to fix the dust cover. The outer ring of the shaft sleeve adopts an integral carburizing and quenching process, wherein the depth of a quenching layer is 0.3mm-0.8mm.
However, the wall thickness of the hole wall of the mounting hole is only 1mm to 1.5mm from the minimum value of the wall thickness between the inner limiting groove and the outer limiting groove. The shaft sleeve is hardened through the inner limiting groove and the outer limiting groove and is hard and brittle, and through long-term observation and after-sale data feedback, the shaft sleeve is easy to crack in the inner limiting groove or the outer limiting groove when in use. Particularly, the arc angle of the inner limiting groove is small, so that internal pressure is concentrated, fine cracks can be generated and extend when the universal joint bearing is stressed, the outer ring opening of the shaft sleeve is broken, potential safety hazards exist, and improvement is needed.
Disclosure of Invention
The invention provides a bearing assembly and a universal joint bearing assembly, aiming at solving the problem that an outer ring opening part of a shaft sleeve is easy to crack after heat treatment.
In a first aspect, the invention provides a bearing assembly, which comprises a shaft sleeve, a roller pin and an oil seal, wherein the roller pin and the oil seal are mounted on the shaft sleeve, the shaft sleeve is provided with a mounting hole, the shaft sleeve is processed by adopting a heat treatment process, a first quenching layer is formed on the wall of the mounting hole, a second quenching layer is formed on the outer side wall of the shaft sleeve, the thickness of the first quenching layer is set to be h1, the thickness of the second quenching layer is set to be h2, and the minimum value of the wall thickness of the wall of the mounting hole is L & gt & lt h1+ h2.
In some embodiments, the wall thickness of the shaft sleeve in the radial line direction of the mounting hole has a minimum value at the corresponding mounting position of the oil seal,
Figure 582893DEST_PATH_IMAGE001
。
in some embodiments, the shaft sleeve is provided with a mounting area at the hole wall of the opening end of the mounting hole, the hole diameter of the mounting area is gradually increased from the opening end of the mounting hole to the other end, and the oil seal is assembled in the mounting area.
In some embodiments, the shaft sleeve is provided with a mounting area on the wall of the opening end of the mounting hole, the diameter of the mounting area is equal, and the oil seal is assembled in the mounting area.
In some embodiments, the boss includes a limit boss protruding from a hole wall of the mounting hole, and the limit boss is located at an open end of the mounting hole.
In some embodiments, the oil seal abuts the limit boss.
In some embodiments, the oil seal is configured with a conical or curved surface that is adapted to the mounting region.
In some embodiments, a bonding surface of the oil seal to the mounting area is configured as a cylindrical surface.
In some embodiments, the oil seal comprises a framework and a rubber piece formed on the framework, the framework is connected with the mounting hole in an interference fit manner, the interference magnitude of the framework assembled with the mounting hole is set to be K, and K is greater than or equal to 0.03mm and less than or equal to 0.5mm.
In some embodiments, the skeleton includes the body and from the flange boss of the tip incurve of body, the rubber molding in the inner wall of body reaches the flange boss, the rubber certainly the flange boss to the crooked extension of the opening direction of body, the rubber has at least one triangle protruding with be located the terminal sealed curved surface of rubber, the triangle is protruding towards the axis direction protrusion of mounting hole.
In some embodiments, the bearing assembly further includes a dust cover sleeved on the shaft sleeve, a concave positioning groove is formed in an outer side wall of the shaft sleeve, one end of the dust cover is buckled into the positioning groove, and the other end of the dust cover extends into the mounting hole and abuts against the rubber member, wherein the minimum hole wall thickness is formed between the bottom of the positioning groove and the hole wall of the mounting hole.
In some embodiments, the mounting hole is provided with a step surface, and the bearing assembly further comprises a gasket abutting against the step surface, wherein the gasket separates the needle roller from the oil seal.
In a second aspect, the invention provides a universal joint bearing device, which includes a cross shaft and the bearing assembly according to any one of the embodiments of the first aspect, wherein an end shaft of the cross shaft is inserted into the mounting hole and rotatably connected to the needle roller, and the oil seal elastically seals an outer peripheral wall of the end shaft.
In order to solve the problem that the outer ring opening of the shaft sleeve is easy to crack after heat treatment, the invention has the following advantages: the minimum value of the wall thickness of the hole wall of the mounting hole is larger than the sum of the first quenching layer and the second quenching layer, so that the problem of hard, brittle and fragmentation after heat treatment and full quenching is avoided. The shaft sleeve only needs heat treatment, and the annealing process of the opening end of the shaft sleeve can be cancelled, so that the production flow is shortened, and the manufacturing cost is reduced.
Drawings
FIG. 1 illustrates a cross-sectional schematic view of a bearing assembly of some embodiments;
FIG. 2 illustrates an enlarged partial schematic view of the open end of the sleeve with a cylindrical surface provided in accordance with some embodiments;
FIG. 3 is an enlarged partial schematic view of the sleeve open end with a tapered surface according to some embodiments;
FIG. 4 illustrates an enlarged partial view of the open end of the sleeve with a stop boss according to some embodiments;
FIG. 5 illustrates an enlarged partial schematic view of an oil seal with a cylindrical surface provided in some embodiments;
FIG. 6 is an enlarged partial schematic view of a beveled oil seal according to some embodiments;
FIG. 7 shows a schematic partial cross-sectional view of a gimbal bearing arrangement of some embodiments;
fig. 8 shows an enlarged schematic view at a in fig. 7.
Detailed Description
The content of the invention will now be discussed with reference to a number of exemplary embodiments. It is to be understood that these examples are discussed only to enable those of ordinary skill in the art to better understand and thus implement the teachings of the present invention, and are not meant to imply any limitations on the scope of the invention.
As used herein, the term "include" and its variants are to be read as open-ended terms meaning "including, but not limited to. The term "based on" is to be read as "based, at least in part, on". The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment". The term "another embodiment" is to be read as "at least one other embodiment".
The present embodiment discloses a bearing assembly according to the present invention, as shown in fig. 1 and 2, the bearing assembly includes a sleeve 10, a needle roller 30 mounted to the sleeve 10, and an oil seal 20.
The shaft sleeve 10 is an integral structural member processed by rigid materials, the integral structural strength is high, and the material properties of all parts are basically the same. The shaft sleeve 10 is made of a metal material, and preferably, the shaft sleeve 10 is made of a columnar material. The sleeve 10 has a mounting hole 11, and the mounting hole 11 is formed from one end to the other end in the direction of the center line of the sleeve 10. In some embodiments, the mounting hole 11 is configured as a blind hole, the needle roller 30 is mounted in the mounting hole 11 near the bottom of the mounting hole 11, and the oil seal 20 is mounted in the mounting hole 11 near the open end of the mounting hole 11. It should be noted that the hole wall of the installation hole 11 may be a straight hole, a stepped hole, or a hole structure with different hole diameters at different positions.
The shaft sleeve 10 is processed by a heat treatment process including a partial quenching treatment or an integral quenching treatment. The surface of the shaft sleeve 10 is subjected to heat treatment to form a quenching layer, and the quenching layer comprises a first quenching layer 12 formed on the wall of the mounting hole 11 of the shaft sleeve 10 and a second quenching layer 13 formed on the outer side wall of the shaft sleeve 10. Specifically, the shaft sleeve 10 is of a tubular structure at a position corresponding to the mounting hole 11, and the first quenching layer 12 and the second quenching layer 13 are respectively located on the inner hole wall and the outer side wall of the tubular structure. In other embodiments, other portions of the sleeve 10 may be hardened, such as the portion of the sleeve 10 corresponding to the needle 30.
The thickness of the quenching layer is adjusted according to the specification and the size of the bearing assembly and the processing technical requirements, in the embodiment, the thickness of the first quenching layer 12 is set to be h1, the thickness of the second quenching layer 13 is set to be h2, and the minimum value of the wall thickness of the hole wall of the mounting hole 11 is L, wherein L > h1+ h2. The minimum value of the wall thickness of the hole wall of the mounting hole 11 is larger than the sum of the first quenching layer 12 and the second quenching layer 13, so that the problem of hard and brittle fracture after heat treatment and full quenching is avoided. The shaft sleeve 10 only needs heat treatment, and an annealing procedure of the opening end of the shaft sleeve 10 can be eliminated, so that the production flow is shortened, and the manufacturing cost is reduced.
The needle roller 30 is mounted to the sleeve 10 and supports the sleeve 10 to constitute a rotation support structure of the sleeve 10. In some embodiments, the needle rollers 30 may be in a single or multiple row configuration. In some embodiments, the bushing 10 is mounted with a conditioner mat 50, the conditioner mat 50 being located at the bottom of the mounting hole 11. The edge of the adjustment pad 50 protrudes toward the end of the needle roller 30, so that the end of the needle roller 30 has a rotational clearance from the rest of the adjustment pad 50. In some embodiments, the adjusting pad 50 is provided with a through hole 51 at the middle thereof, and the hole 51 is coaxial with the center line of the mounting hole 11. There is a gap between the conditioner pad 50 and the needle roller 30 to form a space for receiving grease. Preferably, a relief groove is provided at the bottom of the counterbore of the sleeve 10, and the relief groove communicates with the relief hole 51 to further increase the grease receiving space.
The oil seal 20 is mounted to the mounting hole 11 of the bushing 10 near the open end of the mounting hole 11, thereby preventing leakage of grease. The oil seal 20 is inserted into the mounting hole 11 from the open end of the mounting hole 11 and fitted to the mounting hole 11 to block the needle roller 30 within the sleeve 10. In some embodiments, the oil seal 20 is in interference fit with the mounting hole 11, so as to facilitate the fixation of the oil seal 20 and the shaft sleeve 10.
In some implementationsIn the example, the minimum value of the wall thickness of the shaft sleeve 10 in the radial direction of the mounting hole 11 is at the corresponding mounting portion of the oil seal 20, wherein,
Figure 424947DEST_PATH_IMAGE001
。
in the present embodiment, the oil seal 20 is inserted into the mounting hole 11, and the outer peripheral wall of the oil seal 20 and the first quenching layer 12 are mutually pressed and fixed. The outer peripheral wall of the shaft sleeve 10 is provided with a concave groove structure for positioning and fixing other accessories, and the second quenching layer 13 is arranged on the outer peripheral wall of the shaft sleeve 10. The groove structure is located in the second quenching layer 13. The concave direction of the groove structure faces the central line direction of the mounting hole 11, and accordingly, the minimum value of the wall thickness of the hole wall of the shaft sleeve 10 is located at the bottommost part of the groove structure and is far away from the inner hole wall of the mounting hole 11. The wall thickness of the hole wall of the shaft sleeve 10 is 2.5 times larger than the sum of the thicknesses of the first quenching layer 12 and the second quenching layer 13, so that the problem of hard and brittle fracture after heat treatment and full quenching is avoided. The wall thickness of the bore wall of the sleeve 10 can be adjusted to meet the tooling requirements and service requirements of different bearing assemblies to perform different quench layer thickness requirements. For example, the wall thickness of the bore wall of the sleeve 10 is greater than 2.5 times, 2.6 times, 2.8 times, 3 times, 3.2 times, 3.5 times, 4 times, 4.5 times, 5 times, 5.5 times, 6 times, and others of the sum of the thicknesses of the first and second quenched layers 12 and 13. Optionally, the sleeve 10 is subjected to an integral quenching process, wherein the depth of the quenching layer is 0.3mm-0.8mm.
In some embodiments, as shown in fig. 1 and 3, the shaft sleeve 10 is provided with a mounting area 111 on the wall of the opening end of the mounting hole 11, the diameter of the mounting area 111 gradually increases from the opening end of the mounting hole 11 to the other end, and the oil seal 20 is assembled in the mounting area 111.
In the present embodiment, the mounting region 111 is a portion of the wall of the mounting hole 11 and is near the open end of the mounting hole 11. The mounting area 111 is a portion where the oil seal 20 is mounted so that the oil seal 20 is fixed to a designated position of the bushing 10. The diameter of the mounting hole 11 is inclined from the open end toward the needle roller 30 side, thereby constituting mounting areas 111 having different diameters. In some alternative embodiments, the mounting region 111 is provided as a tapered surface having a taper of B 1 Wherein, B is more than or equal to 0.05 degree 1 Is less than or equal to 1.5 degrees. The aperture of the mounting area 111 close to the opening end of the mounting hole 11 is smaller than the aperture of the mounting area 111 far away from the opening end of the mounting hole 11, and the aperture of the mounting area 111 close to the opening end of the mounting hole 11 is set as d 1 Setting the aperture D of the mounting area 111 far from the opening end of the mounting hole 11 1 Wherein D is not more than 0.02mm 1 -d 1 Less than or equal to 0.2mm to form a conical surface structure with different apertures, thereby improving the convenience of assembly. The mounting area 111 is provided with a conical surface structure, so that the assembling tightness of the oil seal 20 and the mounting area 111 is improved. Preferably, the oil seal 20 and the mounting region 111 are tapered structures that cooperate with each other to improve the tightness of the assembly.
In some embodiments, as shown in fig. 1, 3 and 6, the oil seal 20 is configured with a conical surface or a curved surface adapted to the mounting region 111, and the outer peripheral wall of the oil seal 20 is provided with a conical surface or a curved surface with different outer diameter cross-sectional dimensions, so as to adapt to the conical surface structure of the mounting region 111, thereby improving the bonding tightness between the oil seal 20 and the surface of the mounting region 111. Further, the outer peripheral wall of the oil seal 20 is configured as a tapered surface which fits the tapered surface of the mounting region 111, and the tightness of the combination of the two is high. Preferably, the oil seal 20 is provided with a framework 21 and a rubber member 22, and the framework 21 is matched with the hole wall of the mounting area 111. The outer peripheral wall of the frame 21 is provided with a tapered surface, wherein the diameter of the small end shaft 71 of the frame 21 is d 2 The diameter of the large end shaft 71 of the frame 21 is D 2 Wherein D2-D2 is more than or equal to 0.02mm and less than or equal to 0.2mm. The outer peripheral wall of the framework 21 is provided with a taper which is matched with the taper of the mounting area 111, so that the surfaces of the framework and the mounting area are mutually extruded and attached. Preferably, the taper of the skeleton 21 is B 2 Wherein, B is more than or equal to 0.05 degree 2 ≤1.5°。
In other embodiments, as shown in fig. 1 and 2, the shaft sleeve 10 is provided with a mounting area 111 on the wall of the opening end of the mounting hole 11, the diameter of the mounting area 111 is equal, and the oil seal 20 is assembled on the mounting area 111.
In the embodiment, the mounting area 111 is configured as a cylindrical straight hole structure, so that the oil seal 20 can be directly inserted into the mounting area 111, and the convenience of assembly is improved. The oil seal 20 is in interference fit with the mounting hole 11, and the two are tightly combined.
In some embodiments, as shown in fig. 1, 2, 4, and 5, the interface of the oil seal 20 with the mounting region 111 is configured as a cylindrical surface. The outer peripheral wall of the oil seal 20 is set to be a cylindrical surface, can be directly inserted and matched with the mounting hole 11, and is high in combination tightness. In an alternative embodiment, the outer circumferential wall of the oil seal 20 is configured as a cylindrical surface, which can also be used in the embodiment where the mounting area 111 is configured as a conical surface or a curved surface, so that the resistance of the oil seal 20 to being detached from the mounting area 111 is large, and the stability of mounting the oil seal 20 is improved.
In other embodiments, as shown in fig. 1 and 4, the sleeve 10 includes a limit projection 14 protruding from the wall of the mounting hole 11, and the limit projection 14 is located at the opening end of the mounting hole 11.
In this embodiment, the limiting boss 14 protrudes from the hole wall of the opening end of the mounting hole 11 to form a convex ring structure or a convex point structure, so as to increase the difficulty of detaching the oil seal 20 from the mounting area 111 and achieve self-locking, thereby further improving the mounting reliability of the oil seal 20. Preferably, the limit boss 14 is configured as an annular convex structure to improve the force balance when the oil seal 20 is inserted and the balance for blocking the oil seal 20 from being separated from the mounting region 111. Preferably, the limit projection 14 protrudes from the wall of the mounting hole 11 in a triangular shape so that the limit projection 14 has a guide surface on the side where the oil seal 20 is inserted into the mounting hole 11 to facilitate the insertion of the oil seal 20. When the surface of the limiting boss 14 facing the mounting region 111 intersects with the surface of the mounting region 111 at an obtuse angle or a right angle, the oil seal 20 can be effectively prevented from being separated from the safety region, and particularly, when the limiting boss 14 is in a right-angled triangular convex ring structure, the resistance is larger. When the surface of the limiting boss 14 facing the mounting region 111 intersects the surface of the mounting region 111 at an obtuse angle, the stress concentration between the limiting boss 14 and the mounting region 111 is small, and the structural strength is high.
In some optional embodiments, the height of the limiting boss 14 protruding out of the hole wall of the mounting hole 11 is set to be H, wherein H is more than or equal to 0.05mm and less than or equal to 0.3mm. The height of the limit boss 14 protruding out of the mounting hole 11 can be automatically reset after the oil seal 20 is pressed into the mounting hole 11, so that the self-locking of the oil seal 20 is realized, and the mounting reliability is high.
In some embodiments, the oil seal 20 abuts the limit boss 14. In the present embodiment, the oil seal 20 abuts against the limit boss 14, thereby preventing the oil seal 20 from sliding in the mounting hole 11, and thus defining the movable range of the oil seal 20. The oil seal 20 is abutted against one side of the limiting boss 14 to realize self-locking and movable limiting, and the assembling stability of the oil seal 20 is improved.
In some embodiments, as shown in fig. 1, 4, 5 and 6, the oil seal 20 includes a frame 21 and a rubber member 22 molded on the frame 21, and the frame 21 is connected with the mounting hole 11 in an interference fit manner.
In the present embodiment, the frame 21 is a tubular structural member made of a rigid thin-walled material, and can be elastically deformed under the action of the pressing force. The framework 21 forms the outer peripheral wall of the oil seal 20 and is inserted and positioned with the inner hole wall of the mounting hole 11, wherein the mounting area 111 and the outer peripheral wall of the framework 21 are in mutual extrusion interference fit, so that the oil seal 20 is firmly mounted. Optionally, when the shaft sleeve 10 is provided with the limit boss 14, the framework 21 is limited by the limit boss 14 to limit the axial moving space of the mounting hole 11. Further, the end of the framework 21 abuts against the limit boss 14 to realize self-locking.
The framework 21 is in interference fit with the mounting hole 11, wherein the interference magnitude of the assembly of the framework 21 and the mounting hole 11 is set as K, and K is more than or equal to 0.03mm and less than or equal to 0.5mm. The outer contour dimension of the framework 21 is larger than the inner diameter dimension of the mounting hole 11 so as to realize interference fit, the leakage of lubricating grease is avoided at the joint surface of the framework and the mounting hole, and the joint sealing performance is good.
The rubber part 22 is formed on the framework 21 through a forming process, and the rubber part 22 is tightly combined with the framework 21 and has high connection strength. The rubber member 22 has an elastic structure, and can seal the outer peripheral wall of the end shaft 71 of the cross shaft 70 inserted into the bearing assembly, thereby achieving a good sealing effect.
In some embodiments, the frame 21 includes a tube 211 and a flange boss 212 inwardly bent from an end of the tube 211, the rubber 22 is molded on an inner wall of the tube 211 and the flange boss 212, and the rubber 22 is bent and extended from the flange boss 212 toward an opening of the tube 211.
In this embodiment, the tube body 211 is a thin-walled tubular structure, which can be configured as a cylindrical tube or a tapered tube. The flange boss 212 is located at one end of the tube body 211, and the tube body 211 is bent in a center line direction. A bending angle is formed between the pipe body 211 and the flange boss 212, the rubber piece 22 is formed on the inner hole wall of the pipe body 211 and the inner side face of the flange boss 212, and the combination area of the rubber piece 22 is large. The flange boss 212 provides a supporting force for the rubber member 22 in the axial direction of the pipe body 211, and the pipe body 211 provides a supporting force for the rubber member 22 in the radial direction, so that the rubber member 22 is prevented from being separated from the frame 21 under the action of an external force, and the combination stability is high.
Further, the rubber member 22 has at least one triangular projection 221 and a curved sealing surface 222 at the tip of the rubber member 22, the triangular projection 221 projecting toward the axial direction of the mounting hole 11. The rubber member 22 is projected to form a seal ring, and the triangular projection 221 is distributed on a surface of the seal ring on a side toward the center line of the tubular body 211, thereby sealing the outer peripheral wall of the end shaft 71 of the cross 70 in the inserted state of the cross 70. Preferably, the rubber member 22 is provided with two triangular protrusions 221 which are distributed at intervals, wherein one of the triangular protrusions 221 seals the outer peripheral wall of the end shaft 71 of the cross shaft 70, and the other triangular protrusion 221 seals the chamfer position of the end shaft 71 of the cross shaft 70, so that multiple sealing is realized, and the sealing effect is good. Rubber component 22 sets up to triangle arch 221, and elastic area of contact area under the elastic deformation state crescent and elasticity pretightning force increase, improves sealed effect, prevents that lubricating grease from overflowing. Further, the oil seal 20 further includes a spring 23 sleeved on the rubber member 22, and the spring 23 is sleeved on a sealing portion of the rubber member 22 protruding from the frame 21 to improve the shape stability and sealing reliability of the rubber member 22.
In some embodiments, as shown in FIGS. 1, 7 and 8, the bearing assembly further includes a dust shield 40 that is disposed around the sleeve 10, wherein the dust shield 40 is disposed at the open end of the sleeve 10 to block foreign matter such as sand, dirt, and water from entering the bearing assembly, which affects the connection and operation of the bearing assembly with the cross-shaft 70.
In this embodiment, the dust cover 40 is sleeved on the opening end of the sleeve 10 to fixedly connect the two. The dust cover 40 comprises a dust frame 41 and a dust rubber 42 formed on the dust frame 41, wherein the dust rubber 42 wraps the opening end of the shaft sleeve 10 to maintain the sealing between the dust cover 40 and the opening end of the shaft sleeve 10. It should be noted that the cross section of the dust cover 40 is U-shaped, and the dust cover 40 is fastened into the open end of the shaft sleeve 10, so that one end of the dust cover 40 is located outside the open end of the shaft sleeve 10, and the other end is inserted into the mounting hole 11 and located inside the shaft sleeve 10.
The outer side wall of the sleeve 10 is provided with a recessed positioning groove 112, and one end of the dust cover 40 is buckled into the positioning groove 112. The positioning groove 112 is located on the outer side wall of the shaft sleeve 10, and a positioning rib 421 matched with the positioning groove 112 is arranged at the tail end of the dustproof rubber 42. The dust cover 40 is buckled into the shaft sleeve 10, so that the positioning rib 421 is buckled into the positioning groove 112, thereby realizing positioning installation of the dust cover 40 and the shaft sleeve 10, and simultaneously avoiding the dust cover 40 from being separated from the shaft sleeve 10.
The other end of the dust cover 40 extends into the mounting hole 11 and abuts against the rubber member 22, and specifically, the dust-proof rubber 42 extends into the oil seal 20 and abuts against and seals with the curved sealing surface 222 of the rubber member 22, so that a continuous sealing connection structure is formed, and the sealing effect is good. Preferably, the dust-proof rubber 42 has a dust-proof tapered surface 422 at its end, and the curved sealing surface 222 of the rubber member 22 abuts against the dust-proof tapered surface 422 to form a curved seal, which is effective in sealing. Optionally, the dust-proof cone 422 is recessed and inclined outwards from the center of the dust-proof cover 40, so that the dust-proof cone 422 hooks and supports the curved sealing surface 222, further improving the sealing effect.
The positioning slot 112 is formed by recessing from the outer peripheral wall of the shaft sleeve 10, and the positioning slot 112 is located in the installation area 111 of the oil seal 20, correspondingly, a minimum wall thickness is formed between the bottom of the positioning slot 112 and the wall of the installation hole 11, and the wall thickness of the wall of the hole needs to meet the wall thickness requirements disclosed in the above embodiments.
In some embodiments, as shown in fig. 1 and 4, the mounting hole 11 is provided with a step surface 15, and the bearing assembly further comprises a spacer 60 abutting against the step surface 15, the spacer 60 separating the needle roller 30 and the oil seal 20. The mounting hole 11 is a stepped hole and comprises a large hole section and a small hole section, and the stepped surface 15 is located at the intersection of the large hole section and the small hole section. Wherein the needle roller 30 is installed at the small hole section and the oil seal 20 is installed at the large hole section. The gasket 60 abuts against the step surface 15 to limit the axial moving space of the needle roller 30 and the axial installation position of the oil seal 20, and the separation effect is good.
As shown in fig. 7 and 8, in one embodiment, a universal joint bearing device is disclosed, which includes a cross 70 and a bearing assembly as disclosed in the above embodiments, the cross 70 has four end shafts 71, and each end shaft 71 is provided with one bearing assembly. The end shaft 71 of the cross 70 is inserted into the mounting hole 11 and connected with the roller pin 30, so that the sleeve 10 can rotate relative to the cross 70 through the roller pin 30. The oil seal 20 elastically seals the outer peripheral wall of the end shaft 71, thereby preventing grease from flowing out. Specifically, the rubber member 22 of the oil seal 20 seals the contact surface of the end shaft 71 by the triangular projection 221 to achieve multi-stage sealing. Further, the dust cover 40 is sleeved on the opening end of the shaft sleeve 10, the end shaft 71 of the cross 70 is inserted from the dust cover 40 and penetrates through the oil seal 20 to be connected to the roller pins 30, the roller pins 30 surround the peripheral wall of the end shaft 71, the dust cover 40 further seals the joint part of the cross 70 and the bearing assembly, and the sealing performance is further improved.
The foregoing description of implementations of the present disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosure. The embodiments were chosen and described in order to explain the principles of the disclosure and its practical application to enable one skilled in the art to utilize the disclosure in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims (10)

1. The bearing assembly comprises a shaft sleeve, a rotor and an oil seal, wherein the rotor and the oil seal are arranged on the shaft sleeve, the shaft sleeve is provided with a mounting hole, the bearing assembly is characterized in that the shaft sleeve is processed by adopting a heat treatment process, a first quenching layer is formed on the hole wall of the mounting hole, a second quenching layer is formed on the outer side wall of the shaft sleeve, and the thickness of the first quenching layer is set to be h 1 The thickness of the second quenching layer is h 2 The minimum value of the wall thickness of the hole wall of the mounting hole is L, wherein L & gt h 1 +h 2 (ii) a The minimum value of the wall thickness of the hole wall of the shaft sleeve in the radial line direction of the mounting hole is positioned at the corresponding mounting part of the oil seal, wherein,
Figure DEST_PATH_IMAGE001
；
the oil seal comprises a framework and a rubber piece formed on the framework, the framework is connected with the mounting hole in an interference fit manner, the interference magnitude of the assembly of the framework and the mounting hole is set as K, and K is more than or equal to 0.03mm and less than or equal to 0.5mm;
the hole wall of the shaft sleeve is provided with an installation area, the aperture of the installation area is gradually increased from the opening end of the installation hole to the other end, and the oil seal is assembled in the installation area.
2. The bearing assembly of claim 1, wherein the shaft sleeve is provided with a mounting area on the wall of the opening end of the mounting hole, the diameter of the mounting area is equal, and the oil seal is assembled in the mounting area.
3. The bearing assembly of claim 1 or 2, wherein the bushing comprises a stop boss protruding from a bore wall of the mounting bore, the stop boss being located at an open end of the mounting bore.
4. The bearing assembly of claim 3, wherein the oil seal abuts the limit boss.
5. A bearing assembly according to claim 1, wherein the oil seal is provided with a tapered or curved surface adapted to the mounting region.
6. A bearing assembly according to claim 1 or 2, wherein the interface of the oil seal with the mounting region is configured as a cylindrical surface.
7. The bearing assembly of claim 1, wherein the frame comprises a tube and a flange boss inwardly bent from an end of the tube, the rubber member is formed on an inner wall of the tube and the flange boss, the rubber member is bent and extends from the flange boss to an opening direction of the tube, the rubber member has at least one triangular protrusion and a curved sealing surface at a distal end of the rubber member, and the triangular protrusion protrudes toward an axial direction of the mounting hole.
8. The bearing assembly of claim 1, further comprising a dust cover disposed over the sleeve, wherein the outer sidewall of the sleeve has a recessed locating groove, one end of the dust cover is fastened into the locating groove, and the other end of the dust cover extends into the oil seal and abuts against the rubber member, wherein a minimum wall thickness is formed between the bottom of the locating groove and the wall of the mounting hole.
9. The bearing assembly of claim 1, wherein the mounting bore is provided with a stepped surface, the bearing assembly further comprising a spacer abutting the stepped surface, the spacer separating the rotor and the oil seal.
10. A bearing assembly for a universal joint, comprising a cross shaft having an end shaft inserted into the mounting hole and rotatably connected to the rotor, and a bearing assembly according to any one of claims 1 to 9, wherein the oil seal elastically seals an outer peripheral wall of the end shaft.
CN202211058715.3A 2022-08-31 2022-08-31 Bearing assembly and universal joint bearing device Active CN115126790B (en)

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CS87789A1 (en) * 1989-02-09 1990-06-13 Karel Cernik Compact packing for needle bearing's bush
CN112392867A (en) * 2020-11-05 2021-02-23 杭州正强传动股份有限公司 Sealed dustproof cross axle universal joint
CN212839022U (en) * 2020-08-11 2021-03-30 浙江立群汽车配件制造有限公司 Inner clamping maintenance-free cross shaft universal joint assembly
CN114483803A (en) * 2022-02-21 2022-05-13 浙江万向精工有限公司 A wheel bearing structure with spacer
CN216975576U (en) * 2021-09-08 2022-07-15 万向钱潮股份有限公司 Novel universal joint suitable for electric automobile

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BR0117044B1 (en) * 2001-06-07 2010-12-28 belt bushings and method and apparatus for their manufacture.
JP4311912B2 (en) * 2002-05-24 2009-08-12 株式会社小松製作所 Manufacturing method of crawler belt bush
CN113431845A (en) * 2021-07-16 2021-09-24 万向钱潮股份有限公司 Universal joint capable of exhausting and having long service life
CN216764997U (en) * 2022-03-08 2022-06-17 杭州绿禾汽配有限公司 Heat treatment device for shaft sleeve of cross-shaped shaft universal joint
CN114962461A (en) * 2022-05-06 2022-08-30 万向钱潮股份有限公司 Novel universal joint bearing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS87789A1 (en) * 1989-02-09 1990-06-13 Karel Cernik Compact packing for needle bearing's bush
CN212839022U (en) * 2020-08-11 2021-03-30 浙江立群汽车配件制造有限公司 Inner clamping maintenance-free cross shaft universal joint assembly
CN112392867A (en) * 2020-11-05 2021-02-23 杭州正强传动股份有限公司 Sealed dustproof cross axle universal joint
CN216975576U (en) * 2021-09-08 2022-07-15 万向钱潮股份有限公司 Novel universal joint suitable for electric automobile
CN114483803A (en) * 2022-02-21 2022-05-13 浙江万向精工有限公司 A wheel bearing structure with spacer

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