JPS60209130A - Torque detector - Google Patents

Abstract

PURPOSE:To simplify the mounting mechanism for the titled torque detector and to increase the mechanical strength of a crank shaft by fitting an exciting and detecting core sensor to the magnetic material rotary disk of the crank shaft, and detecting variation in magnetic permeability with torque. CONSTITUTION:A flywheel 3 is mounted on the crank shaft 2 of an automobile and a torque sensor 1 is fitted onto the surface of its magnetic material rotary disk 3 while a gap is left. The torque sensor 1 is constituted by providing winding to a U-shaped magnetic pole piece 61 for excitation and a U-shaped magnetic pole piece 61 for detection. Then, exciting electric power is applied from an exciting power circuit 82 to the magnetic pole piece 61 for excitation to direct magnetic flux to the flywheel 3. The flywheel 3 is applied with torque as shown by an arrow T and tensile force is generated radially as shown by an arrow Q. Then, the magnetic permeability depending upon the tensile force is detected 83 with the magnetic pole piece 71 for detection and the torque is detected from variation in the magnetic permeability. For the purpose, stress generated on the flank of the rotary disk is detected by the torque sensor to eliminate the need to provide the torque sensor by increasing the length of the crank shaft, thereby simplifying the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a torque detection device. The torque detection device according to the present invention is used, for example, when directly measuring the torque of an internal combustion engine or the like on a vehicle.

BACKGROUND OF THE INVENTION A conventional detector of this kind is one that is attached to the output shaft of an engine and detects the torsion of the torque transmission shaft when the engine torque is transmitted to a load such as a wheel. In addition, torsion can be detected electrically using a strain gauge type in which the stain resistance value changes depending on the strain, a magnetostrictive type in which the magnetic properties of the magnetostrictive tube change, and a type that detects the shift in torsion phase between two points on the shaft. There are phase difference types, etc., but the main purpose of these is to detect torque as an engine performance test. Due to its complexity, it is not necessarily suitable as an on-vehicle torque detector.

In addition, a system has been proposed in which the engine crankshaft is directly detected by a magnetic circuit, but in order to mount the excitation/detection core close to the shaft surface, the shaft is axially moved several tens of times. The fight is progressing. However, there is a problem in that stretching the shaft may cause bending of the shaft when the engine rotates at high speed, and there is a possibility of damage to the bearing and the shaft.

OBJECTS OF THE INVENTION An object of the present invention is to mount the sensing part of the excitation/detection core in the axial direction of a rotary plate made of magnetic material mounted on the crankshaft, and to detect changes in magnetic permeability caused by torque generated on the surface of the rotary plate. Based on the idea of detection using a magnetic circuit, the purpose is to accurately detect torque without making any particular changes to the structure of the internal combustion engine.

・Structure of the Invention In the present invention, the open ends of the magnetic pole pieces of the magnetostrictive detection section applying the magnetostrictive phenomenon are installed to face the side surface of the rotating plate made of magnetic material coupled to the rotating shaft. A torque detection device with features is provided.

Embodiment A torque detection device as an embodiment of the present invention is shown in FIG. The structure of the excitation magnetic pole part and the detection magnetic pole part in the apparatus shown in FIG. 1 is shown in FIG. Figure 3 shows ■-■ of Figure 2.
It is a sectional view along a line.

In the apparatus shown in FIG. 1, 2 is a crankshaft of an automobile internal combustion engine (not shown), 3 is a flywheel connected to the crankshaft 2 by a bolt 31, and rotationally driven by the crankshaft 2;
4 is a clutch disc, and 5 is a transmission input shaft. The automobile to which the device shown in FIG. 1 is applied is of the manual transmission type. 1
is a torque sensor for measuring the torque of an engine, and has a U-shaped excitation magnetic pole piece 61 and a U-shaped detection magnetic pole piece 71, and two U-shaped magnetic pole pieces 61 and 71 each have a U-shaped magnetic pole piece 71 for detection. Two windings 621.622 and 721.722 are provided.

Further, the two magnetic pole pieces 61 and 71 each having a wire wound thereon are housed and integrated within a cage 10 made of resin or the like. and the open ends 611, 612 of the two magnetic pole pieces.
and 711.712 is the side part 31 of the flywheel 3
It is attached to the stay 12 from the engine so as to form an air gap of 7°32 at a predetermined distance: t. Note that the windings 621, . Lead wires (not shown) from 622, 721, and 722 pass through the motherboard cage 10, are led out from the outlet 11, and are connected to an external circuit.

81 is an oscillator, and 82 is an excitation power supply circuit. The excitation power supply circuit 82 applies AC excitation power to the windings 621 and 622 wound around the excitation magnetic pole piece 61 of the sensor l, thereby directing magnetic flux to the flywheel 3 through the shear gap 32. It is. On the other hand, the power detection circuit 83 includes windings 721 and 72 wound around the detection magnetic pole piece 71 of the sensor 1.
The detected output voltage detected by 2 is inputted, AC amplified, and outputted to the sampling circuit 84. sampling circuit 8
Reference numeral 4 samples the signal output from the power detection circuit at a constant timing with reference to the alternating current signal of the oscillator 81, and outputs the sampled signal.

In the above configuration, when a torque T is applied to the flywheel 3 as shown by the arrow, a tension Q is generated in the radial direction from the center of the flywheel 3 at the side surface of the flywheel as shown by the arrow, and the stress changes. .

Here, when the windings 621 and 622 of the torque sensor 1 provided opposite to the side surface of the flywheel 3 are excited with alternating current by the oscillator 81 of the drive circuit and the excitation power supply circuit 82, the tension causes the radial transmission. Since the difference in magnetic permeability occurs, an output voltage proportional to the difference in magnetic permeability is generated in the windings 721 and 722 of the detection magnetic pole 71. This detected output voltage is AC amplified by a power detection circuit 83, and then sent to a sampling circuit 84, which samples the signal output from the power detection circuit 83 at a predetermined timing using the AC signal of the oscillator 81 as a reference. ,Output. FIG. 4 is a characteristic diagram showing the relationship between the output voltage E (OUT) (Vl) and the torque T (equal-m) by the torque detection device of the present invention.

In implementing the present invention, various modifications can be made in addition to the above-described embodiments. Further, in the above description, the rotary plate made of magnetic material is a flywheel in a manual transmission type automobile, but it can alternatively be a ring gear plate in an automatic transmission type automobile. FIG. 5 shows a configuration in which the rotating plate made of magnetic material is a ring gear plate in an automatic transmission type automobile.

In the apparatus shown in FIG. 5, 501 is a crankshaft of an automobile internal combustion engine (not shown), and 521 is a bolt 5 attached to the crankshaft 501.
A ring gear play connected by 03 and rotationally driven by it), 522 C is a fluid torque converter,
Center part 5221'i of fluid torque converter 522
The shaft center is aligned with the center hole 5011 of the i-crankshaft 501, and it is connected to the sling gear plate 521 with a bolt 524. 523 is an input shaft of the transmission, which is connected to the fluid torque converter 22 by a spline 525.

Reference numeral 1' denotes a torque sensor for measuring the torque of the engine, and as in the case of the device shown in FIG. It is attached. Figure 5: The operation of the device is as follows:
Basically, it is the same as the case of the apparatus shown in FIG.

Effects of the Invention According to the present invention, changes in stress occurring on the surface of the rotary plate made of magnetic material can be detected without having to measure engine torque by lengthening the crankshaft and installing a torque detector there. It can be configured to measure with a torque detector installed opposite to the rigid surface, and there is a possibility of damage to the crankshaft bearing caused by bending of the crankshaft caused by extending the crankshaft as in the conventional case. , the possibility of damage to the crankshaft can be prevented, and torque detection can be performed accurately without making any particular changes to the structure of the internal combustion engine.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a torque detection device as an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the excitation magnetic pole part and the detection magnetic pole part in the device shown in FIG. 1, and FIG. lll-1
4 is a characteristic diagram showing the characteristics of the device shown in FIG. 1, and FIG. 5 is a diagram showing another embodiment of the present invention. (Explanation of symbols) 1...torque sensor, 2...internal combustion engine crankshaft,
3... Flywheel, 4... Clutch disc,
5... Input shaft, 61... Magnetic pole piece for excitation, 621.622... Winding for excitation, 71... Magnetic pole piece for detection, 721.722... Winding for detection, 81...・
Oscillator, 82... Excitation power supply circuit, 83... Power detection circuit, 84... Sampling circuit. Patent Applicant Japan Auto Parts Research Institute Co., Ltd. Nippondenso Co., Ltd. Patent Application Representative Patent Attorneys Akira Aoki, Patent Attorney Kazuyuki Nishidate, Patent Attorney Masashi Matsushita, Patent Attorney Akira Yamaguchi, Patent Attorney Masaya Nishiyama Figure 1 Fig. 3 722 611621 10 Fig. 4-11 T

Claims (1)

[Claims] 1. The open end of the magnetic pole piece of the magnetostrictive detection unit that applies the magnetostrictive phenomenon is installed to face the side surface of the rotating plate made of magnetic material coupled to the rotating shaft. Torque detection device. 2. The device according to claim 1, wherein the detection section is installed facing the thin wall portion of the rotary plate.