JB/T 5968-1991 Types and basic parameters of liquid-viscous speed regulators

This standard specifies the terminology, code, type and basic parameters of liquid viscous speed regulator. JB/T 5968-1991 Type and basic parameters of liquid viscous speed regulator JB/T5968-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5968-91
Hydroviscous speed governor
Type and basic parameters
Published on December 11, 1991
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Hydroviscous speed governor
Type and basic parameters
Subject content and scope of application
This standard specifies the terms, codes, types and basic parameters of hydroviscous speed governors. JB/T5968-91
This standard applies to various types of hydroviscous speed governors with mineral oil as the working medium and steel or lined friction plates as the basic components.
2 Terms and codes
2.1 Liquid viscous transmission
A type of liquid transmission that uses viscous liquid as the working medium and relies on the viscosity (shear force) of the liquid between the master and slave friction plates to transmit power and adjust the speed and torque is referred to as liquid viscous transmission. 2.2 Liquid viscous speed regulator
Liquid transmission element that transmits power and adjusts speed and torque in accordance with the liquid viscous transmission method (formerly used terms: speed control clutch, slip clutch, omega clutch).
2.3 Synchronous working condition
The working condition of the liquid viscous speed regulator when the master and slave friction plates are engaged under a large clamping force and the input and output speeds are synchronized. 2.4 Zero speed working condition
The working condition of the liquid viscous speed regulator when the master and slave friction plates are disengaged under a small clamping force, the oil film thickness is large, and the output speed is zero (the output shaft carries a load of not less than the no-load torque). 2.5 Speed ​​regulation conditions
Under a certain clamping force, there is a gap between the master and slave friction plates, and the working condition of the fluid-viscous speed regulator when the output speed is lower than the input speed. 2.6 Control oil circuit system
The oil circuit system that controls the oil pressure of the pressurized piston. 2.7 Transmission oil circuit system
The oil circuit system that supplies liquid between the friction plates for fluid-viscous transmission and heat exchange. 2.8 Effective outer diameter D
The outer diameter of the mating surface of the master and slave friction plates. 2.9 Torque coefficient IN
The basic parameter that indicates the capacity value of the fluid-viscous speed regulator. Under the conditions of constant input speed, number of friction plates, effective outer diameter and oil viscosity, its value is proportional to the torque that can be transmitted. The calculation formula is shown in Appendix A (reference).
IN indicates the torque coefficient under a certain speed ratio. Approved by the Ministry of Machinery and Electronics Industry on December 11, 1991 and implemented on July 1, 1992
2.10 Speed ​​ratio 1
The ratio of output speed nz to input speed n;. 1 Slip ratio S
JB/T596891
The percentage of input and output speed difference to input speed. -n2×100%
2.12 Speed ​​range
The speed range of stable operation that can be continuously adjusted. 2.13 No-load torque
The minimum torque on the input shaft when the output shaft is not loaded. 2.14 Clamping force
The pressure that makes the master and slave friction plates close to each other. Usually, this pressure is applied to the friction plates by the pressure piston through the pressure plate. 5 Clamping coefficient e
The coefficient indicating the relative degree of clamping between friction plates. e P
When the hydroviscous speed governor enters the synchronous working condition from the speed regulating working condition, the compression coefficient is called the engagement compression coefficient e=1.0; when the hydroviscous speed governor enters the zero speed working condition from the speed regulating working condition, the compression coefficient is called the disengagement compression coefficient e=0. 2.16 Control pressure p.
The hydraulic system pressure that controls the compression force of the pressurized piston. When the hydroviscous speed governor enters the synchronous working condition from the speed regulating working condition, the control pressure is called the engagement pressure, which is represented by "P1."; when the hydroviscous speed governor enters the zero speed working condition from the speed regulating working condition, the control pressure is called the disengagement pressure, which is represented by "P". 3 Types
3.1 Hydroviscous speed governor
a. Hydroviscous speed governor (horizontal);
b. Vertical hydroviscous speed governor.
3.2 Hydraulic Viscous Speed ​​Regulator
A transmission element in which a hydraulic viscous speed regulator and a gear mechanism are integrated. 3.2.1
Hydraulic Viscous Speed ​​Regulator (Horizontal)
Front-mounted hydraulic viscous speed regulator;
b. Rear-mounted hydraulic viscous speed regulator;
Compound hydraulic viscous speed regulator.
3.2.2 Vertical Hydraulic Viscous Speed ​​Regulator
Hydraulic Viscous Speed ​​Regulator Torque Converter
A transmission element in which a hydraulic viscous speed regulator and a hydraulic torque converter are connected in series to form an integrated unit. 2
Type code
Structural features
Marking example:
Speed ​​regulator
JB/T596891
Update code (in alphabetical order of uppercase Chinese pinyin) Friction plate effective outer diameter, mm/number of joint surfaces
Structural feature code (see Table 1)
Type code (see Table 1)
Liquid viscous transmission code
Speed ​​regulator
Front-mounted
Rear-mounted
Compound
The effective outer diameter D is 250mm, the number of joints is 14, and the horizontal liquid-viscous speed governor that has been improved and updated for the second time: Liquid-viscous speed governor
Basic parameters
YT250/14BJB/T5968-91
5.1 Effective outer diameter D
The effective outer diameter D of the friction plate of the liquid-viscous speed governor shall comply with the provisions of Table 2. Table 2
5.2 Torque coefficient
Torque converter
Under the conditions of No. 8 hydraulic transmission oil as the working medium and oil temperature of 50±5℃, the torque coefficient of the liquid-viscous speed governor shall comply with the provisions of Table 3.
Speed ​​ratio 1
Torque coefficient IN (m\)
D≤400
500D≤800
D≥1000
0.80×104
JB/T5968-91
Appendix A
(reference)
Calculation formula of torque coefficient IN
A1 Liquid-viscous speed regulator relies on the viscosity of the liquid between the friction plates (Shear force) transmits power and adjusts speed and torque. According to Newton's law of internal friction of liquid, under idealized laminar flow, the expression of liquid shear stress t between two rotating planes (master and slave friction plates) is as follows: T=A
Where:
oil dynamic viscosity;
?--rotation radius of a certain point of the master and slave rotating planes; A--angular velocity difference of the master and slave rotating planes; force--oil film thickness between the master and slave rotating planes. =
The width of the ring at the radius of the joint surface of the master and slave friction plates of the liquid viscous speed regulator, the tiny torque is transmitted on a tiny area by liquid viscosity. M= Mn\(n, -n,)(D*-d*)
Considering that the transmission torque of the liquid-viscous speed regulator is proportional to the number of friction plate joint surfaces (Z), its transmission torque is: A3
MM\(n, -n,)(D*- d*)
Formula (A2) and (A3) are not convenient for calculation. In order to simplify the calculation, the difficult-to-measure internal parameter h and the relationship between other parameters are unified into one coefficient, which is called the torque coefficient. Then formula (A3) is simplified to the following formula: M=aμZn,D
The torque coefficient is a derived parameter, which is calculated according to the measured torque. The torque coefficient formula can be obtained by transforming formula (A4): A4
Where: M-
Input torque, Nm;bzxz.net
Number of friction plate engagement surfaces (total number of plates minus 1);Input speed, r/min;
Effective outer diameter of friction plate, mm;
Dynamic viscosity of oil, μ:
Additional instructions:
Oil density, kg/m2:
min/m2;
Oil kinematic viscosity, m/s.
This standard is proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Yang Naiqiao.
People's Republic of China
Mechanical Industry Standard
Liquid Viscous Speed ​​Regulator
Type and Basic Parameters
JB/T596891
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry, Postal Code 100044))
(No. 2 Shouti South Road, Beijing
1/16 Printing Sheet 1/2 Word Count 8000
Format 880×1230
First Edition in February 1992 First Printing in February 1992 Print Count 0.001-1000
Price 1.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn16_896S
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