Pulse drive

FIELD: engines and pumps.

SUBSTANCE: invention relates to pulsed drives designed to vary output shaft r.p.m. and can be used in various machinery. The drive incorporates a post, a motor, a driving shaft with a cam, a driven ratchet wheel with a pawl provided with a tooth to interact with the said ratchet wheel and a hole to interact with the cam. Note that the drive is furnished with the pawl position control system. The control system consists of an electrical magnet mounted onto the post nearby the pawl tooth and designed to hold out of contact with the ratchet wheel, and another electrical magnet arranged opposite the pawl medium part and designed to press it against the ratchet wheel.

EFFECT: automatically controlled gear ratio.

3 dwg

 

The invention relates to the field of engineering, namely to pulse drives used to change the speed of rotation of the output shaft, and can be used in different machines.

Known pulse drives containing the pulse generator, gear and free wheel mechanism. In some of them the variation of the speed of rotation of the output shaft is achieved by changing the amplitude of pulse generator (for example: Maltsev SCI Mechanical impulse transmission. Ed. 3-E. M.: engineering. 1978. 376 C., - p.26) or in the transmission mechanism (for example: Maltsev SCI Mechanical impulse transmission. Ed. 3-E. M.: engineering. 1978. 376 C., - p.27). Moreover, this variation is achieved by changing the geometric parameters of the links including automatically (for example Maltsev SCI Mechanical impulse transmission. Ed. 3-E. M.: engineering. 1978. 376 S. - p. 62). In other actuators variation occurs due to the use of inertia forces (A.I. Leonov Inertial auto transformers torque. - M.: Mashinostroenie, 1978. - 224 S., Il. - p.9-19).

A common disadvantage of the above-mentioned actuator is constructive complexity of the mechanical part of the control system, which makes inefficient use these drives in most real machines.

Known torque transmitting rotation is about the moment, provided with a device to reduce the speed (GB 580046 A, F16 29/02, published 26.08.1946). It contains a leading Cam, beam pusher, a dog mounted on the plunger and cooperating with the driven ratchet wheel, and a control device ensures retention of beam plunger in its upper position out of contact with the Cam. The design contains design: clamping dog to the ratchet wheel, the pusher to the fist and the spring holding the plunger in its upper position.

A large number of springs and kinematic pairs makes the construction complicated and reduces its efficiency and reliability.

The closest totality of the structural characteristics of the present invention is a simple ratcheting gear (II Artobolevsky I.I. Mechanisms in modern engineering: a Handbook for engineers, designers and inventors. 7 So-So 3. 2nd ed., Rev. - M.: Nauka, 1979 - pp. 102), which contains the rack drive shaft is installed eccentric - pulse generator, a slave ratchet wheel and a pawl having a tooth for engagement with the ratchet wheel and an aperture for engagement with a Cam.

The disadvantage of this pulse has no regulation ratio.

To address this shortcoming in the pulse drive with the rack, the movement is running, drive shaft with a Cam follower ratchet wheel and dog, which made the tooth for engagement with the ratchet wheel and an aperture for engagement with a Cam, the actuator is equipped with a system for controlling the position of the dogs, including two electromagnets, one of which is installed on the rack near the tooth of the pawl and is designed to keep out of contact with the ratchet wheel, and the other electromagnet is opposite the middle part of the dog and is designed to compress to the ratchet wheel.

The specified location of the magnets ensures their work is not on the pull, but only on hold dogs that minimizes energy losses and the dimensions of the electromagnets.

If the dog drive shaft accumulates kinetic energy, and when he ratchet wheel, rotating the latter. The frequency and the duty cycle is set by the system control dogs depending on the speed of rotation of the drive shaft. The maximum average speed of the driven shaft meets the transmission number ratchet gear, and a minimum average speed of almost unlimited. The maximum torque of T2on the ratchet wheel is limited by the condition ai<To·F1,

where Ai- useful work when turning the ratchet wheel in one angular step,

E 1- the kinetic energy of the leading link

;,

z2- the number of teeth of the ratchet wheel,

J1- the moment of inertia of the drive shaft, ω1is its angular velocity,

K - coefficient of completeness using the kinetic energy of the flywheel, then, taking K=0.5, we obtain T2=0.04·J1·ω12·z2

Figure 1 shows the proposed drive.

Figure 2 - the section along a-A.

Figure 3 - diagram of the movements of the dog.

Impulse actuator (figure 1, 2), contains the rack 1, engine 2, the driving shaft 3 with a Cam 4, the slave ratchet wheel 5, the pawl 6, which is made of the tooth for engagement with the ratchet wheel 5 and the hole for engagement with a Cam 4. The system controlling the position of the dog contains two electromagnet 7 and 8. Additionally, the actuator is equipped reverse pawl 9 with the spring 10 and the torsion shaft 11.

Figure 3 presents the trajectory of the teeth of dogs with different modes. Curve I corresponds to the movement of the tooth of the dog, based on the emphasis of the electromagnet 7. Curve II describes the trajectory of the tooth of the dog, constantly interacting with the ratchet wheel. Curve III corresponds to many provisions of the tooth of the dog, based on the emphasis of electroma the Nita 8.

The drive works as follows.

In the power cycle movement of links includes the electromagnet 7, bringing the dog to the ratchet wheel. Thus, in the phase of the stroke, the dog is not based on the emphasis of the electromagnet, and interacts with the tooth ratchet wheel, turning the latter. Figure 3 this phase of the movement corresponds to a path segment AB.

In the phase-reverse dog is based on the emphasis of the electromagnet 7 and the tooth moves away from the ratchet wheel and moves along the trajectory of BWA. When moving along this trajectory at the end of the reverse tooth dog gently falls in the corresponding hollow crown ratchet wheel. This allows you to avoid hitting a dog on the next tooth, which reduces noise in the transmission.

In the cycle of energy storage enables the electromagnet 8, and the dog comes to its emphasis in the phase of its return stroke, and remains attached to this emphasis in the next cycle, not relying on the ratchet wheel. Figure 3 is a trajectory III. Thus, the inclusion of the respective electromagnets 7 and 8 provide mechanism in a power or update mode.

In the case of mechanism in the automatic mode, the system control the position of the dog provides the electromagnet 7 when reaching ω1>[ω]. The actuator operates in power is ikle. When speed ω1<[ω] the control system turns off the electromagnet 7 and includes an electromagnet 8, that is, switches the drive mode of energy storage. During one or more subsequent cycles of the driving shaft accumulates kinetic energy, accelerating to speed ω1>[ω] and again turns on the electromagnet 7.

Reverse dog prevents the return of the ratchet wheel back under the action of the torque T2on the output shaft that provides guaranteed engagement of the pawl with the ratchet wheel in the next cycle of interaction.

The minimum number of teeth of the ratchet wheel is limited to the allowable angle of pressure in ratcheting engagement z2≈30. Given this limitation, it is proposed to use this drive for automatic control of gear ratio depending on the applied torque T2in the range of gear ratios from 30 to 300.

The application of the drive is possible in machines which do not require high smoothness of motion, for example, gate valves, screw lifts and so on.

Pulse drive with the rack, a motor, a drive shaft with a Cam follower ratchet wheel and dog, which made the tooth for engagement with the ratchet wheel and hole is the hole for engagement with a Cam characterized in that the actuator is equipped with a system for controlling the position of the dogs, including an electromagnet mounted on the rack near the tooth of the dog, designed to keep out of contact with the ratchet wheel, and the other electromagnet, located opposite the middle part of the dogs that is designed to compress to the ratchet wheel.



 

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