CS243911B1 - Torque scanning device - Google Patents

Abstract

The solution concerns a scanner device torque, the essence of which is that is the sensed angle of rotation occurring at the axial displacement of the gear wheel through the threaded flat, with the offset of the toothed The wheel has a spring with a linear characteristic. The advantage of this arrangement is that the output the signal has a discreet character and a change spring stiffness is possible within wide limits change sensor sensitivity. On the other hand a considerable radial compliance is suitable for the sensor for applications where we require poppy start of the machine. The listed device is suitable for permanent mounting into agricultural gearboxes construction machinery, automobiles, other devices in which it is needed ensure the continuous measurement of the torque.

Description

(54) Torque sensing device

The present invention relates to a torque sensing device, which is based on the fact that the rotation angle resulting from the axial displacement of the gear on the threaded flat is sensed, and a spring having a linear characteristic acts against the displacement of the gear.

The advantage of this arrangement is that the output signal is of a discrete nature, and by varying the spring stiffness, the sensitivity of the sensor can be varied within wide limits. Due to the high radial compliance, the sensor is suitable for applications where a soft start of the machine is required.

Said device is suitable for permanent installation in gearboxes of agricultural, earth moving, construction machines, cars or other devices, where it is necessary to ensure permanent measurement of transmitted torque.

¹ 1

The present invention relates to a torque sensor device.

Torque sensors are used, the operation of which is based on the torsional stress of the torque-carrying rods or tubes, or the sensors based on the sensing of the axial force generated on the inclined plane by the torque transmitted. Another group is the sensors utilizing the axial force of the n-a threaded flat, the axial force being measured by the deformation sensors on the resilient member. A disadvantage of these sensors is that the sensor output signal is of an analogous nature, which is unfavorable in terms of temperature dependencies as well as the transmission of information from the measuring member to the evaluating device, and because of the technical realization of the flexible sensor member.

The above drawbacks are overcome by the torque sensing device according to the invention, which consists of an output sprocket connected by a spring to a housing, which is connected to an output shaft via a radial-axial bearing, the disc being connected to an output shaft. and the tube is rigidly connected to the output gear. The tube and disc are equipped with sensors.

An advantage of the torque sensing device is that the output signal is of a discrete nature. Another advantage is that the sensitivity of the sensing device can be easily varied by the stiffness of the spring used, and that it has considerable radial compliance, which has a positive effect when starting the machines.

The attached drawing shows an embodiment of a torque sensing device consisting of an input shaft 2 fixedly connected to an input gear 1. The input gear 1 engages the output gear 3 connected to the output shaft 7 by a thread 12. The torque is transmitted by the input shaft. 2 through the input gear 1 to the output gear 3 and the output shaft 7. The axial force exerted on the thread 12 by the transmitted torque is transmitted to the spring 4 by the output gear 3, which deforms under the influence of axial force and As the output gear 3 is connected to the output shaft 7 by a thread 12, the output gear 3 is also rotated relative to the output shaft 7 at the same time.

The angle-1 of rotation is directly proportional to the transmitted torque -and depends on the stiffness of the spring 4 and the pitch angle of the thread 12. The angle-1 of rotation is sensed by sensors 10 located on a disk 9 which is fixedly connected to the output shaft 7 and tube 8. The sensors 10 may be of different designs (e.g. optical, magnetic).

The time delay of the signals coming from the sensors 10 will be proportional to the transmitted torque and inversely proportional to the angular velocity of the output shaft 7. By means of a suitable circuit connection, the instantaneous transmitted torque is then determined. The marks on the disc 9 and the tube 8 may be perforations, protrusions, etc. According to the type of sensors used 10. With large axial strokes of the output gear 3, it is advisable to position the sensor 10 on the tube 8 so that it can be displaced relative to the frame 15 so that the fork 13 engaging the groove 11 carries the sensor 10 depending on the axial displacement of the output gear wheels 3.

The other side of the spring 4 is rigidly connected to the sleeve S, which is connected via a radial-axial bearing S to the output shaft 7. The purpose of the radial-axial 1-bearing B is to ensure that the spring 4 is only subjected to tension. By means of a suitable stop for the output gear 3, it is possible to realize a sensor which starts to react from a certain amount of torque depending on the bias of the spring 4. In order to avoid the danger of oscillation. so that the output gear 3 is axially non-self-clamping.

The above torque sensor is suitable for the permanent installation of machine gearboxes as an operating torque sensor. When using machines with a constant angle-speed, the wiring of the circuits connected to the torque device is considerably simplified.

Claims (1)

SUBJECT The torque sensing device is characterized in that it consists of an output gear-wheel (3) connected by a spring (4) to a bushing (5) which is connected via a radial-axial bearing (6) to an output shaft (7). wherein the coil (9) is rigidly connected to the output shaft (7) and the tube (8) is rigidly connected to the output gear (3j), the tube (8) and the disc (9j being provided with sensors (10)).