JB/T 2984.1-2001 Crawler bulldozer carrier sprocket

This standard specifies the structural type and main dimensions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of crawler bulldozer sprocket assemblies. This standard applies to crawler bulldozer sprockets with track pitches of 203, 216, and 228.6 mm, and also applies to sprockets of crawler bulldozers, pipelayers, well-draining machines, and loaders with the same pitch. JB/T 2984.1-2001 Crawler Bulldozer Sprocket JB/T2984.1-2001 Standard download decompression password: www.bzxz.net

ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T2984.1-2001
Crawler tractor
Carrier rollers
Crawlertractor-dbzer-Carrierrollers2001-04-03 Issued
China Machinery Industry Federation
Implementation on 2001-10-01
JB/T2984.1—2001
This standard is a revision of JB/T29841981 "Crawler tractor carrier rollers". Compared with JB/T2984-1981, the main technical content of this standard has been changed as follows: Delete the diagrams and tables of the structure and size of each part, and include the test method chapter;
-Abolish the percentage sampling inspection, and implement GB/T2828-1987 "Batch-by-Batch Inspection Count Sampling Procedure and Sampling Table (Applicable to the Inspection of Continuous Batch)".
This standard will replace JB/T2984-1981 from the date of implementation. This standard is proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The responsible drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Shandong Bulldozer General Factory Torque Converter Branch, Shaanxi Huanggong Group Parts Company, Hubei Xianning Engineering Machinery Co., Ltd., Jiangsu Kunshan Tool Factory. Participating drafting units of this standard are: Hebei Yangyuan Agricultural Machinery Repair and Manufacturing Factory, Guangdong Shaoguan Powder Metallurgy Factory, Shandong Jining Yongsheng Engineering Machinery Parts Factory, Sichuan Xinjin Wenjing Machinery Factory, Xining Jinhai Engineering Machinery Parts Company, and the 6421st Factory of the People's Liberation Army. The main drafters of this standard are Li Mingxiang, Chen Baolan, Wang Xiangyou, Tian Jun and Cai Zuliang. This standard was first issued in November 1981 and this is the first revision. 1 Scope
Machinery Industry Standard of the People's Republic of China
Crawlertractor-dozr-Carrierollers
Crawlertractor-dozr-CarrierollersJB/T2984.1—2001
Replaces JB/T29841981
This standard specifies the structural type and main dimensions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of crawler tractor sprocket assemblies.
This standard applies to the sprockets of crawler pushers (hereinafter referred to as sprockets) with track pitches of 203, 216, and 228.6 mm, and also applies to the sprockets of crawler pushers, pipelayers, well-draining machines, and loaders with the same pitch. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T93—1987
GB/T 1191986
GB/T 230—1991
GB/T2311984
GB/T297—1994
GB/T894.1~894.2—1986
GB/T 19581980
GB/T2828—1987
GB 3452.1—1992
GB/T56171985
GB/T 57831986
JB/T59441991
JB/T60351992
JB/T2983.1—1998
JB/T 71581993
JB/T8293.1—1999
JB/T8293.2—1999
3Structural types and main dimensions
Standard spring washers
Cylindrical pins
Metal Rockwell hardness test methods
Metal Brinell hardness test methods
Rolling bearingsTapered roller bearingsDimensionsShaft circlips Type A and Type B
Shape and position tolerance inspection regulations
Batch inspectionCount sampling procedures and sampling tables (applicable to continuous batch inspection)O-rings for hydraulic and pneumatic applications Dimension series and tolerances Determination of effective hardened layer depth after induction or flame quenching of steel Hexagon head bolts with full thread Grade A and B
General technical conditions for heat-treated parts of construction machinery Support sprocket and track roller assembly, bench test method Track-type bulldozer track roller
Determination method of cleanliness of construction machinery parts Floating oil seal
Test method of floating oil seal
3.1 The structural type and main dimensions of the support sprocket with track pitch of 203 and 216 mm shall comply with the provisions of Figure 1 and Table 1; the structural type and main dimensions of the support sprocket with track pitch of 228.6 mm are shown in Figure 2 and Table 1: the parts list is shown in Table 2. Approved by China Machinery Industry Federation on April 3, 2001 and implemented on October 1, 2001
Track pitch t
JB/T2984.1-2001
203, 216 pitch carrier sprocket
Figure 2228.6 pitch carrier sprocket
Table 1 Main dimensions of carrier sprocket
Φ100-
Medium 170
Medium 185
Carrier sprocket shaft
Oil seal outer seat
Oil seal inner seat
Sprocket body
Locking nut
Sprocket cover
Name of standard parts
Cylindrical pin
O-type sealing ring
Floating seal ring
O-type sealing ring
O-type sealing ring
Single row cone
Roller bearing
O-type sealing ring
Gasket 10
JB/T2984.1—2001
Sprocket parts list|| tt||Use pitch
M16X15×33
203.216,228.6
203, 216
203, 216
70 ×3.55(70×3.1)
(95×15)
93.3X14.5
100×15
130X3.55(3.1)
135X3.55( 3.1)
(82X9)
(7511)
105X3.55(3.D)
M10×30
M10×35
203, 216
203, 216
203, 216
203, 216
203, 216
The values ​​in brackets in the name column are only for old products. Note:
Marking example
Recommended materials
40Mn2 or 50Mm
35 or 20
QT450-10
ZG50Mn
or 40Mh2, 50Mm
Spring steel wire
HT350 or QT450-10
40G or 45
N-butyl rubber
Special alloy cast iron
or powder metallurgy
Nitrile rubber
Nitrile rubber
Bearing steel| |tt||Nitrile rubber
The track pitch t is 203mm, and the working wheel diameter d is Φ170mm, marked as quantity
Standard code
JB/T2984.1
JB/T2984.1
JB/T2984.1
JB/T2984.1
JB/T2984.1
JB/T2984.1
JB/T2983.1
GB/T 119
GB/T894
GB/T3452.1
JB/T8293.1
GB/T3452.1
JB/T8293.1
GB/T297
GB/T3452.1
GB/T93
GB/T5783
4 Technical requirements
General requirements
JB/T2984.1-2001
Carrier sprocket 203×170
JB/T2984.1—2001
4.1.1 Carrier sprockets shall be manufactured according to drawings and technical documents approved by the prescribed procedures and shall comply with the provisions of this standard. 4.1.2 The purchased parts of the sprocket should comply with the relevant national standards or industry standards, and the outsourced parts should comply with the requirements of the drawings and should have a certificate of conformity.
All parts should be free of sharp corners and burrs, and the appearance and dimensional accuracy should be strictly checked before assembly, and they should be cleaned. 4.1.4
The sealing parts of the floating oil seal and other sealing parts shall not be bruised or scratched. 4.1.5
The floating oil seal O-ring and the outer cone of the floating seal ring shall not be stained with oil, and the floating oil seal O-ring shall not be twisted during assembly. During assembly, the press-fitted mating surface and the bright band of the floating seal ring should be coated with a small amount of hydraulic lubricating oil. 4.1.7 After assembly, fill in 80% of the capacity of clean heavy-duty vehicle gear oil according to the oil brand specified in the product manual, and leakage is not allowed. Machining quality requirements
The machining quality requirements shall comply with the provisions of Table 3, and the machining parts are shown in Figure 3. Table 3 Machining quality requirements
Part name
Sprocket shaft
Sprocket body
Inner oil seal seat
Outer oil seal seat
Floating oil seal
Test items
dOuter circle size accuracy
dOuter circle size accuracy
dOuter circle surface roughness
Radial runout of outer circle to axis
4Inner hole size accuracy
dInner hole surface roughness
dInner hole size accuracy| |tt||dInner hole surface roughness
dInner hole coaxiality
dExternal circle dimension accuracy
dExternal circle surface roughness
Radial run-out of inner cone to axis
dInner hole dimension accuracy
dInner hole surface roughness
Radial run-out of inner cone to axis
Surface roughness of oil seal bright band
Flatness of oil seal bright band
Note: d, d, d in the table are dimensions before press-fitting. See Figure 3 for part names and dimensions. Heat treatment quality requirements
The heat treatment quality requirements shall comply with the provisions of Table 4. The heat treatment parts are shown in Figure 3.4
Quality requirements
As per drawing requirements
As per drawing requirements
Raolμm
As per drawing requirements (or static sealing test without leakage)Serial number
Part name
Sprocket wheel body
Sprocket wheel shaft
Floating oil seal
Sprocket wheel
JB/T2984.1—2 001
External: school seal inner sliding seal
Wheel body
Figure 3 Sprocket wheel machining and heat treatment parts
Table 4 Heat treatment quality requirements
Test items
Quenching hardness of C surface
Deepness of hardened layer on CD surface
Deepness of hardened layer at R
Quenching and tempering hardness
Surface hardness of bright band
Note: Heat treatment parts are shown in Figure 3. The depth of hardened layer is measured at the middle of the rolling surface width on C surface and at the middle of the wheel rim height on D surface. 4.4
Appearance and assembly quality requirements
Appearance and assembly quality requirements of sprocket wheels shall comply with the requirements of Table 5. Table 5 Appearance and assembly quality
Test items
Appearance quality
Axial movement
Bolt tightening torque
Oil plug tightening torque
Sealing performance
Rotation performance
Oil cleanliness
Quality requirementswwW.bzxz.Net
248~293
The surface of casting, forging, welding and processing parts is smooth, without obvious defects, and the paint is evenly distributed , beautiful 0.1-0.2
55-122
103-132
117~157
157-255
No leakage within 30s after filling with 0.4MPa pressure
The wheel body can be turned by hand, and it feels neither tight nor loose≤012
4.5 Service life requirements
The service life of the sprocket wheel should not be less than 4000h. 5 Test method
5.1 Inspection of machining quality
JB/T2984.1-2001
5.1.1 The dimensional accuracy is measured by the inside diameter dial indicator, outside diameter micrometer, depth gauge or vernier caliper as usual. 5.1.2 The shape and position tolerances shall be measured in accordance with Chapters 4 to 6 of GB/T19581980. 5.1.3 The surface roughness shall be measured by self-testing and comparison with a surface roughness meter or a roughness standard sample block. 5.1.4 The flatness of the bright band of the floating oil seal shall be measured by the relevant interference microscope or static oil sealing test in JB/T8293.2. 5.2 Inspection of heat treatment quality
5.2.1 The surface hardness of the rate fire shall be measured by Rockwell or Brinell hardness tester in accordance with Chapters 5 to 8 of GB/T2301991 and Chapters 3 to 6 of GB/T2311984, respectively, and the arithmetic mean shall be taken. 5.2.2 The depth of the hardened layer shall be measured by Rockwell hardness method in accordance with the provisions of GB/T5617. The test location is shown in Figure 3 and Table 4 Note. 5.2.3 The determination of the quality of other heat treatments shall adopt the measurement methods specified in Chapters 4 to 6 of JB/T59441991. 5.3 Inspection of appearance and assembly quality
5.3.1 Appearance quality Use visual inspection to check the integrity of the sprocket assembly parts; check the flatness and cracks, flash, sand adhesion, scratches and other defects of the surface of cast, forged, welded and machined parts; check the unevenness, peeling, flow marks and other defects of the paint. 5.3.2 Determination of axial movement: Remove the floating seal outer seat and floating seal of the sprocket, fix the wheel body, and measure the movement of the sprocket shaft with a dial indicator.
5.3.3 Determination of the tightening torque of bolts and screw plugs: First fix the wheel body, and then use a torque wrench with a reading meter to measure 5.3.4 Leakage inspection: Turn the wheel body, pass 0.4MPa pressure air into the screw plug hole, and observe that the pressure gauge pointer does not drop within 30s. 5.3.5 Rotation performance measurement: Rotate the wheel by hand, and it is better if it feels neither tight nor loose. 5.3.6 Oil cleanliness shall be measured according to the provisions of JB/T7158. 5.4 Service life assessment
Assessment shall be carried out according to the 500h bench test method in JB/T6035, or according to the written certificate of 3 users with time statistics and failure records. The bench test report data or user's written certificate is valid for 4 years. 6 Inspection rules
6.1 Factory inspection
Each sprocket shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory. The factory inspection items include the appearance of the sprocket, the integrity of the assembly, the rotation performance of the wheel body, the sealing performance and leakage of the lubricating oil, the tightening torque of the bolts and oil plugs, etc. Its machining quality, working surface hardness, axial movement, and oil cleanliness inspection are carried out during the production process. 6.2 Type test
6.2.1 Classification of non-conformities
Any inspected item that does not meet the requirements of Chapter 4 is called a non-conformity. Non-conformities are divided into Class A, Class B and Class C non-conformities, see Table 6.
Non-conformity category
(Fatal)
(Serious)
(General)
2 Acceptable quality level AQL value
JB/T2984.12001
Classification of non-conformities in the quality of sprocket wheels
Non-conformity content
Unused assemblies have visible cracks in the wheel body or oil leakage and flakes The hardness of the rolling surface of the wheel body or the depth of the hardened layer does not meet the requirements The dimensional accuracy of the inner hole d of the sprocket wheel does not meet the requirements The sprocket wheel The surface roughness of the hole d in the body does not meet the requirements. The dimensional accuracy of the hole d in the body of the carrier wheel does not meet the requirements. The surface roughness of the hole d in the body of the carrier wheel does not meet the requirements. The reliability of the assembly bench test or the reliability of user use does not meet the requirements. The surface roughness of the outer circle d of the carrier wheel shaft does not meet the requirements. The dimensional accuracy of the outer circle d of the carrier wheel shaft does not meet the requirements. The oil cleanliness does not meet the requirements.
The runout of the inner cone of the inner seat of the oil seal to the axis does not meet the requirements. The runout of the inner cone of the outer seat of the oil seal to the axis does not meet the requirements. The surface roughness or flatness of the bright band of the floating seal ring does not meet the requirements. The main parts (wheel The material properties of the carrier wheel body, shaft, sleeve, inner and outer seats, floating seal) do not meet the requirements. The coaxiality of the inner hole d of the carrier wheel body does not meet the requirements. The outer diameter size accuracy of the carrier wheel shaft d does not meet the requirements. The runout of the outer diameter of the carrier wheel shaft d to the axis does not meet the requirements. The outer diameter size accuracy of the oil seal inner seat d does not meet the requirements. The outer diameter surface roughness of the oil seal inner seat d does not meet the requirements. The outer diameter size accuracy of the oil seal outer seat d does not meet the requirements. The outer diameter surface roughness of the oil seal outer seat d does not meet the requirements. The depth of the hardened layer at R of the carrier wheel body does not meet the requirements. The axial play does not meet the requirements.
The tightening torque of the bolts does not meet the requirements. Request
Oil plug tightening torque does not meet the requirements
Sealing performance Slight oil leakage but not dripping
Rotation performance is too loose or too tight and feels unsatisfactory Appearance quality does not meet the requirements
Small defects exist in casting, forging and welding
Material performance of minor parts does not meet the requirements
The AQL value of the sprocket quality level is shown in Table 7. The AQL value in the table is the acceptable quality level per hundred units of products, where Ac represents the qualified judgment number of the sample, and Re represents the unqualified judgment number of the sample. The item number can be used as the minimum judgment unit during inspection. 6.2.3 Sampling plan
JB/T2984.12001
6.2.3.1 Sampling inspection is carried out in accordance with the provisions of GB/T2828. The sampling plan type is a normal sampling plan. 6.2.3.2 The inspection level is selected as the general inspection level II. 6.2.3.3 The inspection batch N is generally 16-25 (pieces), but when the user is sampling, the size of N is not limited. Random sampling. 6.2.3.4 The sample size code is C, and the randomly selected sample size n-5 (pieces) should be inspected according to the items listed in Table 6, and at least one piece should be cut to measure the hardened layer depth and metallographic structure. The cutting test results of this piece represent the results of all samples. The qualified quality level AQL value is shown in Table 7.
6.2.3.5 The sampling plan is shown in Table 7.
Table 7 Sampling plan
Classification of non-conformities
6.2.4 Evaluation of sampling inspection
Inspect the samples according to the sampling plan specified in this standard and fill in the results in the summary table (see Table 8). When the number of non-conformities per hundred items in the sample is less than or equal to Ac, it is judged as qualified; when it is greater than or equal to Re, it is judged as non-conformities. When all categories are judged as qualified, the product is finally evaluated as qualified, otherwise it is non-conformities, but it is allowed to replace the missing non-conformities of Class B with the excess non-conformities of Class C.
Table 8 Summary of inspection results
Class A non-conformity
Sampling plan
Small bricks
Marking, packaging, transportation and storage
Class B non-conformity
AQL=65
Sampling plan
The sprocket wheel shall at least include the following textual content when leaving the factory: a) Manufacturer name;
b) Sprocket wheel model and quantity;
c) Sprocket wheel standard name and code:
d) Manufacturing date or delivery date:
e) Inspection certificate.
7.2 Packaging and transportation
Class C non-conformity
AQL=150
Sampling plan
7.2.1 The packaging of the sprocket wheel can be carried out according to the user's requirements. It should be wrapped with a strong rope, and the exposed part of the sprocket shaft should be coated with grease (yellow 8
JB/T2984.1—2001
oil) and wrapped with plastic cloth for rust prevention. The assemblies should be separated by plastic cloth or wooden boards and fastened with wire to prevent sulfur damage during transportation. 7.2.2 The following should be indicated on the packaging box: a) Name, address and postal code of the receiving unit: b) Name, specification, quantity and weight of the assembly or parts: e) Shipping date: d) Name, address, postal code and telephone number of the manufacturer. Storage
The sprocket and finished parts should be placed in a ventilated, dry, non-corrosive warehouse. It should be guaranteed to be free of rust within 1 year. 9
Mechanical Industry Standard
Crawler Bulldozer Sprocket
JB/T2984.12001
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
: Postal Code 100 044)
1/16 sheet 3/4
Format 880×1230
4Word count 20000
First edition August 2001 First printing August 2001 Print run 1-500
Price 1200 yuan
2001-011
Mechanical Industry Standard Service Network: http/hwwwJB.ac.cn1001t6
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