This standard specifies the materials, basic types, dimensions and tolerances, working media, bearing matching parts, etc. of thermosetting plastic bearings using water as lubricant. This standard applies to thrust bearings and radial bearings made of thermosetting plastics, used in water pumps, submersible motors, water turbine pumps, turbines, food machinery, etc., which work in water media. JB/T 5985-1992 Sliding bearings Water-lubricated thermosetting plastic bearings JB/T5985-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5985-1992
Sliding Bearings
Published on July 17, 1992
Water-lubricated Thermosetting Plastic Bearings
Implemented on July 1, 1993
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Sliding Bearings
1 Subject Content and Scope of Application
Water-lubricated Thermosetting Plastic Bearings
JB/T5985-1992
This standard specifies the materials, basic types, dimensions and tolerances, working media, and bearing matching parts of thermosetting plastic bearings using water as lubricant.
This standard applies to thrust bearings and radial bearings made of thermosetting plastics, used in water pumps, submersible motors, water turbine pumps, water turbines, food machinery, etc., which work in water media. Reference standards
GB1184
GB1220
GB2828
JB3199
Bearing materials
Packaging, storage and transportation pictorial symbols
Technical conditions for high-quality carbon structural steel
Surface shape and position tolerances Provisions for unindicated tolerances Stainless steel bars
Batch-by-batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Technical conditions for water-lubricated wear-resistant plastic materials
Water-lubricated bearing materials are usually phenolic plastics P23-1, P117 and poly(dipropylene phthalate) (DAP-2) and other plastics. P23-1 materials should comply with the provisions of JB3199: P117, DAP-2 materials should refer to the provisions of JB3199 for mechanical properties, wear resistance and heat resistance.
Basic type
4.1 Basic type of thrust bearing
The basic type of thrust bearing is shown in Figure 1.
The sliding surface of the thrust bearing can be in the form of a sector or a rib block. Its bottom surface can be a plane (Figure 1a, b) or a groove surface (Figure 1c, d). 4.2 Basic type of radial bearing
The basic type of radial bearing is shown in Figure 2.
The sliding surface of the radial bearing has a spiral groove or a straight groove. The direction of rotation and the number of heads of the spiral groove are not specified in this standard. The positioning type of the outer circle of the radial bearing shall be negotiated by the supply and demand parties. Approved by the Ministry of Machinery and Electronics Industry on July 17, 1992 and implemented on July 1, 1993
Zhendian Guoweifang
Xin Shenmeiweicaoxiang#
Figure 1 Thrust bearing
(hi=-1.5,≤5
JB/T 59851992
5 Marking
Marking code
Marking code see Table 1.
Thrust bearing
Radial bearing
The sliding surface of the thrust bearing is a sector surface
The sliding surface of the thrust bearing is a rib block
The bottom surface of the thrust bearing is a plane
The bottom surface of the thrust bearing is a groove surface
5.2 Marking method
5.2.1 Marking method for thrust bearing
JB/T 59851992
Not indicated
Not indicated
Spiral precision
Square straight
Full arc straight precision
Radial bearing inner circle is straight groove
Radial bearing inner circle is spiral groove (left flag)Radial bearing inner circle is spiral groove (right hand)P23-1 plastic
P117 plastic
DAP-2 plastic
L (left)
Marking method of radial bearings
Dimensions, tolerances and technical requirements of bearings
1Dimensions and tolerances of thrust bearings
JB/T5985-1992
JB/T5985
Bottom surface type code
Sliding surface type code
Outer diameter, mm
JB/T5985||tt ||Straight groove or spiral groove code
Material code
Length, mm
Inner diameter, mm
Dimensions and tolerances of thrust bearings are shown in Table 2 and Figure 14
Outer diameter D
Inner diameter.
Wall thickness er
6.2 Dimensions and tolerances of radial bearings
Location hole
Center circle
Diameter D||tt ||Diameter d,
Dimensions and tolerances of radial bearings are shown in Table 3 and Figure 2. JB/T5985-1992
Number of holes n
(pieces)
Sliding surface is sector-shaped
Lubricating water
Number of grooves (pieces)
Groove width
Sliding surface
is rib block
Number of rib blocks
(pieces)||t t||Water inlet of lubricating water tray
Hole cross-sectional area
Depth or rib
Bar height
Total is not
less than mm
Inner diameter d
Outer diameter D
6.3 Technical requirements
1 Surface roughness
Length L
30, 40, 48
35, 44, 52||t t | 114
110,132
96, 120, 144
104, 130, 156
120, 150, 180
JB/T5985-1992
Clean surface with straight groove
Square groove
(wxb）ir
Circular groove
Clean surface with spiral groove
tt||Bearing inner hole and journal|| Minimum clearance between
(double-sided)
Bearing outer circle setting
positioning requirement
Bearing outer circle does not set
positioning requirement
The sliding surface roughness of thrust bearing and radial bearing is R≤1.6Ⅱm: the roughness of thrust bearing bottom surface and radial bearing outer circle surface is R≤3.2μm; other surfaces are R≤6.3μm. 6.3.2 Flatness of thrust bearing bottom surface
The flatness tolerance of thrust bearing bottom surface shall not be lower than Grade 10 specified in GB1184 (thrust bearing outer diameter D is the main parameter) 6.3.3 Contact area between thrust bearing sliding surface and thrust plate The actual contact area between thrust bearing sliding surface and thrust plate shall not be less than 70% of the theoretical contact area. 6.3.4 Coaxiality of radial bearings
The coaxiality tolerance of the center line of the inner surface of the radial bearing to the center line of the outer surface shall not be lower than Grade 8 specified in GB1184. 6.3.5 Appearance requirements of bearings
The surface of the bearing shall be smooth and flat, without burrs, sharp edges, cracks, bubbles, and a small amount of dark and light color spots are allowed. 7 Working medium
The working medium of the bearing is clean water with a sand content (weight ratio) not exceeding 0.01%, its pH value is 6.5-8.5, the chloride ion content does not exceed 400m, and the water temperature is not higher than 65℃. 6
Parts matching the bearing
Material and surface conditions of matching parts
JB/T5985-1992
Surface roughness R.≤0.8um.
The surface of the journal and thrust plate matching the bearing shall be hardened or hard chrome plated, with a surface hardness of 45~50HRC. The recommended materials for the journal and thrust plate are 3Cr13 specified in GB1220 or 45 steel specified in GB699. 8.2 The tolerance of the seat hole diameter matching the outer circle of the radial bearing The tolerance zone of the seat hole diameter matching the outer circle of the radial bearing is H8. 8.3 The total cross-sectional area of ​​the water holes of the metal tray of the thrust bearing The total cross-sectional area of ​​the water holes of the metal tray of the thrust bearing shall comply with the provisions of Table 2. 9
Allowable load and life of thrust bearing
Under normal working conditions, the thrust bearing operates for 5000h under the maximum allowable load specified in Table 4, and the reduction in bearing thickness is not more than 1mm.
Bearing outer diameter D
Inspection rules
Inspection of bearing materials
Maximum allowable load
Inspection of bearing materials shall be carried out in accordance with JB3199. 10.2
Bearing Inspection
Bearing Outer Diameter D
100120
130150
160170
Maximum Allowable Load
The user shall inspect according to the single sampling plan and inspection level II specified in GB2828. The qualified quality level (AQL) shall comply with the provisions of Table 5. The sample size, qualified judgment number (Ac), and unqualified judgment number (Re) corresponding to Table 5 are shown in Table 6. The bearing manufacturer shall inspect each item specified in Table 5 before the product leaves the factory, and the product may leave the factory only after it passes the inspection. Table 5
Thrust bearing outer diameter
Thrust bearing thickness
Flatness of thrust bearing
Contact area between thrust bearing sliding surface and thrust plateRadial bearing inner diameter
Radial bearing outer diameter
Radial bearing length
Radial bearing coaxiality
Article number of this standard
Qualified quality levelWww.bzxZ.net
Batch range
91-150
151-280
281-500
501~1200
1201~3200
3201~10 000
Sample size
Packaging, marking, transportation and storage
JB/T5985-1992
Qualified quality level AQL
Bearings should be cleaned and wrapped with paper before being packed in corrugated paper boxes or wooden boxes. The graphic marks on the boxes should comply with the provisions of GB191. The following should be indicated on the packing boxes:
a. Product name, model and quantity:
Packing date:
c. Manufacturer name;
Arrival station and receiving unit:
e. Departure station and shipping unit;
f. Packing box size and weight.
The product inspection certificate should be attached to the packing box. 11.2
The packaging should ensure that it is not damaged during normal transportation. Simple packaging can also be used if the user agrees. Bearings should be stored in a ventilated and dry place, avoiding high temperature, sun exposure, rain, and violent collision during transportation. The markings on the packaging box should be complete and clear.
Additional instructions:
This standard is proposed and managed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry. 3
This standard was drafted by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry, Shanghai Materials Research Institute, Shanghai Electrical Science Research Institute, Hengshui Chemical Factory, and Shanghai Jinshan Engineering Plastics Factory. The main drafters of this standard are Wan Ma, Yu Zhongqian, Zhang Qiaoying, Shi Zhongchun, and Lei Jianhui. 8
People's Republic of China
Mechanical Industry Standard
Sliding Bearing Force
Water-lubricated Thermosetting Plastic Bearings
JB/T 59851992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 3/4
Word Count 16,000
First Edition in October 1992
First Printing in October 1992
Print Quantity 1-500
Price 2.40 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn26186
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