This standard specifies the speed, direction of rotation, type, size and power transmission of the power output shaft of walking tractors. This standard applies to the horizontally configured power output shaft of walking tractors above 2.5kW. JB/T 7278-1994 Power output shaft of walking tractors JB/T7278-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7278-94
Power Take-off Shaft of Walking Tractor
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Power Take-off Shaft of Walking Tractor
Subject Content and Scope of Application
This standard specifies the speed, direction of rotation, type, size and transmission power of the power take-off shaft of walking tractors. This standard applies to the transversely configured power take-off shaft of walking tractors above 2.5kW. 2 Standard speed of power take-off shaft
2.1 Standard speed
1000r/min:
540z/min.
The standard speed of the power take-off shaft is reached when it is not less than 90% of the rated speed of the engine. When the tractor power output shaft has only one standard speed, it should be 1000r/min. 2.2 Marking
JB/T727894
When the tractor uses a single power output shaft to change speed or uses two power output shafts to achieve two standard speeds of 1000r/min and 540r/min respectively, there should be a mark to distinguish between high and low speeds at the shift point or the corresponding shaft extension. 3 Rotation direction of the power output shaft
The rotation direction of the power output shaft should be the same as the rotation direction of the drive wheel when the tractor moves forward. 4 Type, size and position of the power output shaft extension and its connecting sleeve 4.1 Typebzxz.net
The type of the power output shaft should comply with the provisions of Table 1. 1
Power output shaft model
Shaft extension type
Connection type
4.2 Dimensions
EXT 12Z×1.5m×30P×6f
INT12Z×1.5m×30P×6H
EXT15Z×1.5mX30P×6i
INT15Z×1.5m×30P×6H
The dimensions of the power output shaft shall comply with the requirements of Figures 1 and 2. For spline parameters, see Appendix A (supplement). Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
Note: 1) Hardness of the net fire zone on the spline surface>50HRCJB/T727894
Transmission layout surface
Transmission plug right side
Type power output shaft
Figure 21 Type power output shaft
Note, 1》Spline surface net fire zone whip hardness ≥S0HRC4.3 Position
4.3.1 Drag 4.3.2 When the frame is in a horizontal position, the height of the power output shaft axis from the ground shall not be less than 45mm5 The power output shaft can transmit
The power output shaft can transmit shall comply with the provisions of Table 2 Table 2
Power output shaft model
Allowed transmission power kw
Protective device of power output shaft
Power output is not used, no swimming, etc.
JB/T 7278-94
Appendix A
Power output shaft spline parameters
(Supplement)
A1I type power output shaft spline parameters shall comply with the provisions of Table A1. Table A1
External spline (shaft extension)
Pressure
Tolerance and fit category
Maximum value of involute starting diameter
Maximum value of effective tooth thickness
Minimum value of actual tooth thickness
Minimum value of effective tooth thickness
Maximum value of actual tooth thickness
Minimum radius of curvature of tooth root
Cumulative tolerance of pitch
Tooth profile tolerance
Tooth direction tolerance
6fGB 3478. 183
#19.50二8：
$15.75二
Type 1 power extraction shaft spline parameters shall comply with the provisions of Table A2. Number of teeth
Pressure angle
Internal spline (connection sleeve)
Tolerance grade and fit category
Minimum value of involute end circle diameter
Maximum value of actual tooth groove width
Minimum value of effective tooth fine width
Minimum value of actual tooth groove width
Maximum value of effective tooth clear width
Minimum radius of curvature of tooth root arc||tt ||Cumulative tolerance of pitch
Tooth profile pad
Tooth tolerance
External spline (shaft extension)
Pressure angle
Tolerance grade and fit category
Starting diameter of the break line
Maximum effective tooth thickness
Minimum actual tooth thickness
Minimum effective tooth thickness
Maximum actual tooth thickness
Minimum curvature radius of tooth root
Cumulative tolerance of pitch
Tooth profile tolerance
Tooth tolerance
6fGB 3478.183
#24.00-0.m
#20.25=#52
Pressure angle
Internal spline (coupling sleeve)
Tolerance grade and fit category
Minimum value of involute end diameter
Maximum value of actual tooth width
Minimum value of effective tooth width
Minimum value of actual tooth width
Maximum value of effective tooth width
Minimum radius of curvature of tooth root circle
Cumulative tolerance of pitch
Tooth profile tolerance
Tooth direction tolerance
6HGB 3478. 1 - 83
420. 25*9 a
416, 80*9
6HGB 3478. 1- 83
$24. 751g 4
421.23**1*
Additional remarks:
JB/T727894
This standard is proposed by the National Technical Committee for Tractor Standardization. This standard is under the jurisdiction of the Luoyang Tractor Research Institute of the Ministry of Machinery Industry: This standard is drafted by the Luoyang Tractor Research Institute. The main drafter of this standard is Wang Shiyan.
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