CN2668922Y - Liquid viscous coupling - Google Patents

Abstract

A liquid viscous coupling used for permanent four-wheel or multi-wheel drive of automobiles or special vehicles. The liquid viscous coupling mainly includes driving shaft (2), O-shaped rubber ring (3), retaining ring (4), screw (5), left end cover (6), rolling bearing (7, 11), spacer ring (8 ), active friction plate (9), passive friction plate (10), housing (12), right end cover (13), silicone oil (15), etc. As the passive part, the housing (12) is threadedly connected with the left end cover (6), and is used to connect with a drive shaft of the vehicle. The passive friction plate (10) is splined with the housing (12), and the passive friction plate There are isolation rings (8) of fixed thickness between (10) to separate them from each other and maintain an equal gap. The active friction plate (9) is sleeved on the driving shaft (2) by splines and alternates with the passive friction plate (10) Arranged together, the liquid viscous coupling is filled with a certain amount of working medium - high viscosity silicone oil (15), used for power transmission between the active and passive friction plates (9, 10), the right end cover (13) and the shell Body (12) adopts threaded connection. The liquid viscous coupling has the advantages of simple structure, good sealing performance, easy installation on vehicles and the like.

Description

liquid viscous coupling

technical field

The utility model relates to a liquid viscous coupling. The liquid viscous coupling can be used in the constant four-wheel or multi-wheel drive of automobiles, especially off-road vehicles or special vehicles.

Background technique

The so-called four-wheel drive vehicle is a vehicle that transmits engine power to the front and rear four wheels. The early four-wheel drive vehicles were mainly off-road vehicles. With the continuous resolution of technical difficulties, the application range of four-wheel drive vehicles has gradually expanded to General purpose vehicles, performance sedans and sports cars. Generally speaking, four-wheel drive vehicles can be divided into three types. The first type is a short-term four-wheel drive vehicle, which is characterized by the driver switching between two-wheel drive and four-wheel drive according to road conditions; the second type is a timely four-wheel drive vehicle, which is characterized by two-wheel drive and four-wheel drive The switching operation of the four-wheel drive is done automatically; the third type is the permanent four-wheel drive vehicle, which is characterized in that the vehicle is always in the four-wheel drive state without the driver's operation, and there are also literatures that refer to the latter two types as normal Four-wheel drive. Four-wheel drive vehicles mainly have the following four problems: sharp turning braking phenomenon, mutual interference of front and rear wheels, low transmission efficiency, and large vibration and noise of the transmission system.

Contents of the invention

Liquid viscous coupling mainly includes input shaft, driving shaft, O-shaped rubber ring, retaining ring, screw, left end cover, rolling bearing, spacer ring, active friction plate, passive friction plate, shell, right end cover, output shaft, working Medium - high viscosity silicone oil, etc. When a vehicle equipped with a liquid viscous coupling is running normally, since the front and rear wheels rotate at the same speed, there is no relative rotation between the active and passive friction plates of the liquid viscous coupling. The driving force is still a two-wheel drive vehicle; if one of the driving wheels slips into the mud and loses traction, the vehicle will slow down or even stop. After working for a long time, the heat generated by friction will increase the temperature of the silicone oil and expand its volume, and the volume occupied by the air will be close to zero. Pressed on the passive friction plate to form a quasi-rigid connection, so that the drive shaft and the housing are integrated into a hump working state, the transmitted torque rises sharply, the liquid viscous coupling transmits power to other wheels, and the vehicle automatically turns into a four-wheel drive. In the form of wheel or multi-wheel drive, it is easy to get out of the anchorage. The liquid viscous coupling also does not produce the speed interference phenomenon between the shafts and the wheels, and eliminates the cycle power phenomenon between the shafts. At the same time, due to its own characteristics, it also attenuates a large part of the vibration and noise in the transmission system. It can be said that the liquid viscous coupling can easily overcome the four problems of the four-wheel or multi-wheel drive vehicles listed above. The vehicle has the characteristics of high transmission efficiency and good fuel economy. In addition, the liquid viscous coupling has a simple structure, is convenient to manufacture, and has low cost.

Description of drawings

Figure 1 is a front view of the structure of the liquid viscous coupling;

Figure 2 is a diagram of the active friction plate of the liquid viscous coupling;

Figure 3 is a diagram of the passive friction plate of the liquid viscous coupling;

Fig. 4A is a right view of the right end cover of the liquid viscous coupling; Fig. 4B is a front view of the right end cover of the liquid viscous coupling;

Fig. 5A is a front view of the driving shaft of the liquid viscous coupling; Fig. 5B is a cross-sectional view of A-A plane on the driving shaft of the liquid viscous coupling;

The main structures in the figure are input shaft (1), driving shaft (2), O-shaped rubber ring (3), retaining ring (4), screw (5), left end cover (6), rolling bearing (7, 11), isolation Ring (8), active friction plate (9), passive friction plate (10), housing (12), right end cover (13), output shaft (14), silicone oil (15).

Detailed ways

A liquid viscous coupling, including an input shaft (1), a driving shaft (2), an O-shaped rubber ring (3), a retaining ring (4), a screw (5), a left end cover (6), a rolling bearing (7, 11), isolation ring (8), active friction plate (9), passive friction plate (10), housing (12), right end cover (13), output shaft (14), silicone oil (15). The outermost part of the liquid viscous coupling is the casing (12), and the inner spline is processed on the inner wall of the casing (12), which is engaged with the outer spline of the passive friction plate (10), and the two cooperate with each other to transmit power , no relative rotation, there is an isolation ring (8) between every two passive friction plates (10), so that each passive friction plate (10) maintains an equal gap. The center of the liquid viscous coupling is the driving shaft (2), and the external spline is processed on the outer surface of the driving shaft (2), which is engaged with the internal spline of the driving friction plate (9), and the two cooperate with each other to transmit power. There is no relative rotation, but the active friction plates (9) can slide axially along the spline grooves provided on the drive shaft (2), and the active and passive friction plates (9, 10) are arranged together at intervals during installation. Insert the O-ring (3) into the groove of the left end cover (6), insert the driving shaft (2) from the left side of the liquid viscous coupling housing (12), and push the driving shaft (2) ) into the appropriate position in the holes of the sealed bearings (7, 11), the sealed bearings (7, 11) are pressed into the left and right end covers (6, 13) respectively with tools, and the retaining ring (4) is clamped into the liquid with a special tool In the groove on the left side of the viscous coupling housing (12), the right end cover (13) and the housing (12) are threaded, and a certain amount of working medium—high-viscosity silicone oil is filled in the housing (12). Its filling rate is above 85%, and a part of air is kept in the device. There are two filling holes in the left end cover (6) for injecting and discharging silicone oil. After the assembly is completed, screw on the screw (5) and apply anaerobic Sealant seals.

When the vehicle is running normally, the front and rear wheels rotate at the same speed, there is no relative rotation between the active and passive friction plates (9, 10) of the fluid viscous coupling, the idling does not transmit power, the rear wheels have no driving force, and the front wheels are still driven. If once the front wheels slip into mud and spin idling, the vehicle will slow down or even stop. At this time, when the housing (12) of the fluid viscous coupling and the drive shaft (2) rotate relative to each other, the active and passive friction plates (9, 10) Relative rotational motion also occurs, because there is a high speed difference, the oil film between the active and passive friction plates (9, 10) is sheared and transmits power. The occupied volume is close to zero, and the pressure inside the casing (12) rises sharply, pushing the active friction plate (9) to move along the spline, so that the active friction plate (9) is tightly pressed against the passive friction plate (10), and the The metal friction between the two connects the driving shaft (2) and the casing (12) into one body, and the transmitted torque rises sharply, so the driving torque is distributed to the rear wheels, and the vehicle automatically becomes four-wheel drive, which is very fast. Easy to break away from anchorage.

The phenomenon that the liquid viscous coupling can transmit a large torque without speed difference is called the hump phenomenon. It is a unique phenomenon in the working process of the liquid viscous coupling. The self-protection phenomenon of the shaft, in the process of a sharp rise in temperature, it is very dangerous for the liquid viscous coupling to continue to work, and at this moment, the liquid viscous coupling is locked, and the active and passive friction plates run synchronously. The speed difference drops rapidly, and the working process of shearing the oil film to transmit torque is stopped. The temperature of the silicone oil does not continue to rise, and self-protection from overheating is realized. The hump phenomenon will not be eliminated until it is fully cooled, and the working state of relying on the shearing of the oil film to transmit torque will be restored. .

Claims (3)

1. liquid viscous coupling, it is characterized in that: comprise input shaft (1), driving shaft (2), O type rubber ring (3), back-up ring (4), screw (5), left end cap (6), rolling bearing (7,11), isolating ring (8), active friction plate (9), driven friction (10), housing (12), right end cap (13), output shaft (14), silicone oil (15), housing (12) inwall has internal spline, be meshed with the external splines of driven friction (10), isolating ring (8) is realized driven friction (10) mutual separation vertically, make it fixing gap, driving shaft (2) is a splined shaft, be meshed with the internal spline of active friction plate (9), active friction plate (9) can be free to slide on driving shaft (2) along spline, main, driven friction (9,10) compartment of terrain is arranged in together, and housing (12) all adopts with left end cap (6) and right end cap (13) and is threaded.

2. liquid viscous coupling as claimed in claim 1 is characterized in that: described right end cap (13) is threaded with housing (12), and is integrally welded again after tightening, and left end cap (6) is close to cooperation and housing (12) is seated back fixing by back-up ring (4).

3. liquid viscous coupling as claimed in claim 1 is characterized in that: described driven friction (10) maintains static on housing (12), and fixing gap is arranged.

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