GB 1593.4-1987 Three-point hitch device for agricultural wheeled tractors Part 4: Category 0 GB1593.4-1987 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Three-point hitch device for agricultural wheeled tractors
Part 4: Category 0
Agricultural wheeled tractors-Three-pointllnkage Part 4,Category0
This standard applies to small agricultural wheeled tractors with traction power not exceeding 15kW (20.4 horsepower). This standard specifies the main dimensions and parameters of the rear three-point hitch of small agricultural wheeled tractors. 1 Nouns, terms
UDC 621.372:629
.11.013
GB1593.4-87
1.1 Suspension rod: It consists of an upper pull rod and two lower pull rods composition. One end of the pull rod is connected to the tractor with a ball joint, and the other end is connected to the farm implement with a ball joint.
1.2 Suspension point: the center point of the spherical hinge connection between the tie rod and the farm implement. 1.3 Hinge point: The center point of the spherical hinge connection between the pull rod and the tractor. 1.4
Upper tie rod and lower tie rod: components of the suspension rod, with ball hinges at both ends for connection (10 and 11 in Figure 1). 1.5 Upper suspension point: The center point of the spherical hinge connection between the upper tie rod and the farm implement (3 in Figure 1). 1.6
Lower suspension point: the center point of the spherical hinge connection between the lower tie rod and the farm implement (9 in Figure 1). 1.7
Upper hinge point: the center point of the spherical hinge connection between the upper tie rod and the tractor (2 in Figure 1). 1.8 Lower hinge point: The center point of the spherical hinge connection between the lower tie rod and the tractor (12 in Figure 1). 1.9
Upper suspension point connecting pin: The pin that connects the upper tie rod and the agricultural implement. This pin is an integral part of the upper tie rod (7 in Figure 1). Lower suspension point connection pin: This pin is generally rigidly fixed on the farm implement, and is connected to the lower tie rod through it (8 in Figure 1). 1.10
1.11
Upper hinge point connecting pin: the pin that connects the upper tie rod to the tractor (1 in Figure 1). Locking pin: A pin with an elastic locking ring used to lock the ball hinge connection (5 in Figure 1). 1.12
1.13
Lift rod: The force transmission rod that connects the outer lift arm and the lower pull rod (4 in Figure 1). 1.14
Pole: The component used to fix the upper suspension point on the agricultural implement (6 in Figure 1). Column height: the vertical distance from the upper suspension point to the common axis of the lower suspension point (M in Figure 1). 1.15
1.16 Minimum height of lower suspension point: When the lower rod is in the lowest position, the vertical distance from the lower suspension point to the ground. This height can be achieved by adjusting the lifting rod or changing the installation position (U in Figure 4). 1.17 Horizontal adjustment range: The adjustment range of one lower suspension point in the vertical direction relative to the other lower suspension point, used to adjust the lateral inclination of the agricultural implement (V in Figure 4).
1.18 Lower suspension point span: the distance between the convex shoulders of the two lower suspension point connecting pins. The side of the ball joint of the lower link is against this shoulder (N in Figure 1).
1.19 Lock pin hole distance: the distance between the lock pin hole axis and the suspension point connecting pin shoulder (D, K in Figures 1 and 2). 1.20 Power lifting range: Corresponding to the full stroke of the lifter cylinder, the movement amount of the lower suspension point in the vertical direction. Does not include adjustment of suspension rods or lift rods (W in Figure 4).
1.21 Transport height: When the lifting rod is adjusted to the shortest position and the common axis of the lower suspension point is horizontal and horizontal at the highest lifting position, the vertical distance from the lower suspension point to the ground (X in Figure 4). 1.22 Lower suspension point clearance: To eliminate the lateral swing of the lower tie rod, the radial distance between the lower suspension point at the highest position and the tractor (Y in Figure 4).
National Bureau of Standards released on 1987-01-02
Implemented on 1987-09-01
GB1593.4-87
1.23 Adjustment of the column: the column is plumb in the longitudinal direction The effective movement range in the plane is represented by the maximum height and minimum height of the following suspension point from the ground. Within this range, a column with a height of 410 mm should be able to be adjusted to a backward tilt of 10° relative to the plumb line. Note: Adjustment of the column can control the longitudinal inclination of the farm implement. Tractor designers use it to determine the reasonable minimum adjustment amount of the pull rod length, and agricultural implement designers use it to determine the plowing depth range of the agricultural implement. This plowing depth range can be obtained by adjusting the longitudinal inclination of the agricultural implement. ?
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Figure 1
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RR
GB1593.4 —87
Lower suspension point common axis
N
Suspension triangle
Figure 2
RR
2 dimensions
Power output shaft 1
GB1593.4-87
Figure 3
Figure 4
The dimensions of the three-point suspension device should comply with Figures 1 to 3 and the table on the next page Regulation. Upper tie rod
Lower tie rod (horizontal)
A
Item
Connecting pin diameter
Upper suspension point
—Connecting pin hole diameter
B-
C—ball joint width
D—lock pin hole distance
GB1593.4-87
item
E —The width between the outer surfaces of the brackets
F——The width between the inner surfaces of the brackets
Lower suspension point
G—The diameter of the coupling pin
H—The coupling pin Hole diameter
—ball joint width
K—locking pin hole distance
L—locking pin hole diameter M-
N| |tt||o
P
s
Column height
Lower suspension point span
The lateral distance from the lower suspension point to the center plane of the tractor The amount of lateral swing of the suspension point
The radius of the space spherical surface around each suspension point The longitudinal horizontal distance from the end of the power output shaft to the lower suspension point when the lower tie rod is in the horizontal position
U——The lowest lower suspension point Height
V.
One horizontal adjustment range
W——Power lifting range
—Transportation height
x-
Y-
Lower suspension point clearance
Adjustment of the column
Minimum height at the highest position
Maximum height at the lowest position
Most
small
18.92
19.30
76
44.5
21.79
22.43
34.8
39*
12
410**
most
mm
big
19.00
19.51
44
69
22.00
22.73
35.0
465±1.5**
250*
50||tt ||45
300
75
420
600
100
420
Note: The tractor being tested should When parking on a level hard road, the tire specifications and inflation pressure should comply with the manufacturer's regulations. 3 Power lifting capacity
375
200
200.
At 610mm behind the lower suspension point, the traction power per unit (kW) should be no less than 300N (30.6kgf ) lifting power. Note: The above values ??are values ??that can be achieved in the entire power lifting range when the hydraulic system safety valve adjusts 90% of the pressure and the recommended column height. When determining the lifting force, the minimum angle between the column and the plumb line is 10° (Figure 5). *In order to limit the lateral swing of agricultural tools, the use of lateral tie rods is allowed. When the transverse tie rod is connected to the lower tie rod and the suspension point connecting pin, the minimum size should be 51mm. ··Recommended dimensions, these may be changed if necessary for special farm implements. 4The instantaneous center position of the upper and lower pull rods
GB1593.4-87
Figure 5
P
When the tractor is in the dry land farming state, draw a 9° oblique line forward and upward from the intersection of the extension line of the upright column and the ground. The instantaneous center should be at Within the hatched range shown in Figure 6.
5 Horizontal convergence angle of the left and right lower pull rods
The convergence angle a of the left and right lower pull rods in the horizontal position should be 15°~30° (Figure 6). The vertical distance h from the midpoint of the left and right lower suspension points to the bottom of the plow. The vertical distance h from the midpoint of the left and right lower suspension points to the bottom of the plow should comply with the plow series standards, but not less than 390mm (Figure 6). Ground
Imaginary plane (located at half the trench depth)
Type trench bottom surface
0.5 wheelbase
Wheelbase
1.25 wheelbase||tt| |Figure 6
Additional notes:
GB1593.487
Except for the scope of application, dimensions M, N, P and items 4 to 6 in the table, this standard is consistent with GB1593. 2 to 87 are the same. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of Luoyang Tractor Research Institute. This standard is drafted by Luoyang Tractor Research Institute and China Agricultural Machinery Research Institute. The main drafters of this standard are An Zhongtao and Xie Weixiang.
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