Adjustable transmission

 

(57) Abstract:

The invention relates to the field of mechanical engineering. In the driver are located symmetrically with respect to its axis of rotation shafts. The shafts are connected with devices providing periodic opening and closing the kinematic connection of the shafts and their respective satellites. Also mounted on the shafts of the levers, the ends of which are pressed to a rolling stop. By changing the position of the focus is changing trajectory him pressed against the ends of the levers. The technical result is increased efficiency and increased control range gear ratio. 2 Il.

The invention relates to mechanical regulated transmission and can be used in various engineering industries, including the manufacture of wheeled and tracked vehicles.

Known adjustable mechanical transmission comprising a drive shaft with a Cam of the intermediate shaft, the tank and the output gear transducers, shaft and control mechanism (1).

The disadvantages of these programs are narrow limit change gear ratio and the variable angular velocity of the driven shaft when the is adjustable transmission, contains (2) driving and driven shafts, two freewheel, a gear mechanism, a variator, a leading link which is connected with the drive shaft, differential, includes drove with satellites, two Central wheels, one of which is connected with the drive shaft, the other through the freewheel is connected with the driven shaft, a carrier connected with the driven element of the variator and the driving member of the gear mechanism, and a slave link the past with the help of the other clutch is connected with the driven shaft.

This transfer provides a uniform angular velocity of the driven shaft at uniform rotation of the drive shaft and a wide control range gear ratio.

However, the presence in the transmission of variable-speed drive reduces its efficiency and limits the magnitude of the transmitted torque.

The objective of the invention is to provide a variable transmission with high efficiency, providing transport machines transfer the required power at acceptable size.

The problem is solved due to the fact that in known adjustable transmission containing installed on the slave and the master shaft of the Central gear wheel, drove with satellites in the driver are sidecase opening and closing the kinematic connection of the shafts and their respective satellites, on the shafts are attached to the levers, the ends of which are pressed to a rolling stop, allowing you to change its position change trajectory primalsense thereto of the ends of the levers.

In the technique unknown shafts, carrier, levers, stops and devices guard and disconnect the kinematic connection between the shafts and the satellites as a device for regulating the transmission ratio of the transmission.

In Fig.1 shows an adjustable transmission, General view; Fig. 2 - the same, the section a-a in Fig.1.

The transmission includes a shaft 1 has mounted on the Central toothed wheel 2 and the shaft 3 with the planet carrier 4 and 5 satellites. The shafts 6 are located in bearing assemblies 7 symmetrically about the axis of rotation of the carrier and connected with the satellites through the device for periodic circuit and open circuit kinematic linkages 8, shown in Fig.1 in the form of friction clutches. The mechanism off the clutch consists of a plunger 9 with the roller mounted on a drive rod guide bushing pusher 10 (mounting bracket guide sleeve to the cage of Fig. 2 is not shown) and fixed to the body of the transmission flat Cam 11. On the opposite from the friction coupling ends of the shafts close the water (not shown) may change its position, moving the casing 15 of the shaft 3. Limits the rotation of levers fixed stop 16. Leading in this transfer may be as the shaft 1 with the Central wheel and the shaft 3 with the planet carrier 4. The adjustable elements of the transmission can be made and other design concepts: for example, instead of a friction clutch with mechanical actuator may be an electromagnetic clutch, freewheel with a forced lock or gear coupling. To regulate the oncoming flow of power through the transmission may be running in her two movable stops. Instead of springs, clamping the ends of the levers to a rolling stop, can be used with other devices. The movable stop when the appropriate form may be attached to the axis and to change its position by rotation about this axis. The number of satellites can be from two and above.

The transfer works as follows. During the rotation of the drive shaft, which selected the shaft 1, in a clockwise direction (see Fig. 2) the Central gear 2 transmits the force to the satellites. Located in sector BCD satellites connected by a friction clutch 8 with the shaft 6 and can not rotate about their own axes, as fixed on the shafts of the levers rest against the concentration is of ichha rolls on the surface it stops and rotates the shaft of the lever, and with it the pinion in one direction or another depending on the profile of emphasis, which determines the trajectory of him pressed against the ends of the levers. The surface profile of the rolling emphasis provides sector BCD uniform rotation of the satellite relative to the rotation angle of the led. During the rotation of the satellites in a clockwise direction (see Fig. 2) a carrier has a greater angular velocity than the Central wheel, the rotation of the satellite counter clockwise to lower.

Upon further rotation of the carrier satellite sector BCD switches in the DFB sector, the roller follower 10 runs onto the flat of the Cam 11, causing the plunger off of the friction clutch and the kinematic link between the satellite and the shaft of the lever is broken. The satellite rotates in the same direction, and the shaft with lever starts to rotate in the opposite direction to the spinning roller lever on the corresponding surface of the rolling stops. When the satellite sector BCD roller lever reaches profile rolling stops, providing uniform rotation of the shaft 6, and the roller follower runs away with the flat of the Cam and thereby restores the kinematic link between the satellite and the shaft of the lever. Through satelli is the devices of continuous operation of the transmission in the sector BCD is in each moment of time of at least one satellite. By changing the position of the rolling stop profile, which obkatyvalisj the rollers on the levers, changing, therefore, changes the path of movement of the ends of the levers and the change gear ratio of the transmission. When changing the direction of rotation of the drive shaft or the transmission of torque from the driven shaft to the drive direction of rotation of the satellite is changed to the opposite and leverage in the sector BCD, overcoming the resistance of the springs are detached from the surface of the rolling stops. To limit the movement of the levers in the direction opposite to the rolling stops, as well as the possibility of transmission of rotation or torque in the opposite direction in the transmission is set to a fixed stop 16.

We offer adjustable transmission can regulate gear ratio in a wide range: from stop mode, when the driven shaft is not rotating (when using led as the leading link), to multiple increases in the frequency of rotation of the output shaft compared to the input. The speed can be stepless. Its efficiency is significantly higher than in the known regulated transmission using variable-speed drives. The absence of the variator in the proposed transmission is as closing device of a gear coupling. In this case, the angle of rotation of the satellite during one revolution of the carrier must be a multiple of the angular step tooth gear coupling and regulation of the transmission is only possible discrete.

Sources of information

1. A. I. Leonov. A. F. Dubrovsky. Mechanical stepless non-friction transmission of continuous operation. M: Mechanical Engineering, 1984.

2. USSR author's certificate N 1112163, M CL F 16 H 3/44, 1983 (prototype).

Adjustable transmission containing installed on the slave and the master shaft of the Central gear wheel, drove with satellites, characterized in that the driver are located symmetrically with respect to its axis of rotation shafts that connect to devices that provide periodic opening and closing the kinematic connection of the shafts and their respective satellites, are mounted on the shafts of the levers, the ends of which are pressed to a rolling stop, allowing you to change its position change trajectory him pressed against the ends of the levers.

 

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FIELD: mechanical engineering; mechanisms converting rotation of drive shaft into oscillatory rotation of driven shaft at smoothly changing amplitude; non-friction variable-speed drives, hydraulic machines and other equipment.

SUBSTANCE: proposed mechanism has control handle, drive and driven shafts mounted in bearings and unit for converting the unidirectional rotation of drive shaft into oscillatory rotation of driven shaft at change of amplitude of oscillations; it includes carriage mounted rotatably in body, oscillating member mounted on carriage and connected with drive shaft for performing oscillations at constant amplitude, for example rocker arm; it also includes inclined crank mounted in trunnions of driven shaft and rotary-and-translational pair and link articulated with oscillating member.

EFFECT: improved service characteristics; simplified construction; low cost.

12 dwg

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