JPS58195131A - Torque detector - Google Patents

Abstract

PURPOSE:To obtain high accuracy in detection, by providing elastic bodies between the 1st shaft on a driving side and the 2nd shaft on a driven side, and providing a limiting mechanism so as to prevent the max. deflection of the elastic bodies from exceeding the prescribed deflection. CONSTITUTION:A torque detector has the 1st shaft 1 on a driving side which is rotated and driven by an engine and the 2nd shaft 2 on a driven side to be supplied to load. Four elastic bodies 4 mounted with receiving seats 3a, 3b for elastic bodies at both ends are inserted between receiving parts 1a and 2a for elastic bodies, and the bodies 4 are sandwiched in one end of the shaft 1 by means of a coupling flange 5. On the other hand, projections 14, 15 are inscribed respectively on the shafts 1 and the shaft 2, and the max. deflection of the bodies 4 is kept below the prescribed deflection by the decrease of the gap between said projections. The deterioration in the properties of the elastic bodies and the damage thereof are thus prevented and the high accuracy is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque detector for detecting the torque output of a shaft to be measured, such as a transmission shaft of an automobile.

Some conventional detectors of this type are attached to the output shaft of an engine and detect twisting of the torque transmission shaft when the engine torque is transmitted to a load such as wheels. In addition, as methods for electrically detecting torsion, there is a strain gauge type in which the electrical resistance value changes due to strain, a magnetostrictive type in which the magnetic characteristics of a magnetostrictive tube changes, and a phase difference type that detects the shift in torsion phase between two points on the shaft. There are formulas etc.

The main purpose of all of these is to detect torque as an engine performance test, and this type of detector is designed for measuring engine output, and is heavy, complex, and expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a torque detector which has a compact structure, can be mounted on a vehicle, and has excellent reliability. In particular, in the present invention, by providing an elastic body between the first shaft body on the driving side and the second shaft body on the driven side, the amount of relative displacement in the circumferential direction between the two wheel bodies due to the deflection of this elastic body is reduced. The structure is such that the torque is determined by , and an opening mechanism is provided to prevent the maximum deflection of the elastic body from exceeding a predetermined deflection, thereby preventing deterioration and damage of the elastic body and achieving high detection accuracy. .

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view of the torque detection device according to the present invention, and FIG.
The figure is a sectional view taken along the line AA in FIG. Reference numeral 1 denotes a shaft body 1 on the drive side which is rotationally driven by the engine, and 2 represents a second shaft body on the driven side that is supplied to the load. One end of the shaft body 2 side of the shaft body 1 on the drive side has a plurality of □ elastic body receiving portions 1a provided at equal angular intervals (for example, 4 pieces every 9.0°), Drive side shaft body 2
One end □ of one example of the shaft body faces the elastic body receiving part 1a.
.

A plurality of elastic body receiving portions 2a are respectively provided so as to correspond to the elastic body receiving portions 2a. Four elastic bodies 4 with elastic body seats 3a and 3b attached to both ends are inserted between the elastic body receiving parts 1m and 2a (3), and the elastic bodies 4 are pivoted by the coupling flange 5. It is inserted into one end of the body 1 and fixed with a rivet 13. Here, a coil spring is used as the elastic body 4, but rubber may also be used.

Incidentally, the first shaft l has internally toothed protrusions 14 carved at equal intervals, and facing this, the second shaft 2 has protrusions 15 of external teeth carved in the same number at equal intervals. has been done. Both protrusions have a considerable gap in the unloaded state, but as the load torque increases, the gap becomes smaller.

Furthermore, first and second rotating bodies 6.7 are coupled to the first and second shaft bodies 1.2. Both rotating bodies each have a plurality of teeth 6a, 1m:,: provided at equal intervals in both directions.
have. Reference numeral 8 denotes a cylindrical fixed body disposed on the outer peripheral side of each rotating body 6.7, and is fixed by bearings 9 and 10, respectively, so as not to rotate even when the shaft bodies 1 and 2 rotate.

Example A - ``Electromagnetic type (D e - / I 7 y 211・
12 are mounted opposite the teeth 5a and 7a of the rotating body 6.7, respectively, so that the electric signals detected by the pickups 11 and 12 are led to the external circuit via the lead cotton 11a and S12a. It has become.

In the above configuration, when the shaft l rotates in the direction of the arrow shown in Fig. 11.2, the elastic body receiving part 1
a and 5a push the elastic body receiving portion 2a via the elastic body 4, thereby rotating the shaft body 2 together with the shaft body 1 in the same direction as the shaft body 1. When the load on the shaft body 2 is small, the amount of deflection of the elastic body 4 is small, but as the load increases, the amount of deflection of the elastic body 4 increases in relation to the amount of load.

Therefore, the rotating bodies 6 and 7 connected to the shaft 1.2 rotate at the same speed and in the same direction, but when the load on the shaft 2 increases, the rotating body 7 rotates by the amount that the elastic body 4 is deflected. body 6
The angle becomes more retarded and its relative position in the circumferential direction changes. At this time, the relative locking of the rotating bodies 6 and 7 is related to the amount of deflection of the elastic body, that is, the torque of the load.

By the way, in this torque detection device, when the torque used in operation (5) becomes larger than the maximum deflection of the coil spring, that is, the maximum torque normally detected (occurs when starting or stopping the engine), that is, when the shaft body 1 When the torsion angle of the shaft body 2 increases to the maximum, the internal tooth protrusion 14 provided on the shaft body 1 and the external tooth protrusion 15 provided on the shaft body 2 come into contact, preventing the coil spring from coming into close contact with each other. , so that only the load within the allowable value is always applied. Therefore, it is possible to prevent deterioration of the spring constant of the coil spring, change in free length, and damage, and it is possible to always measure torque with high accuracy.

FIG. 6 is a waveform diagram when processing the electric signals of the pickups 11 and 12. (al is the pulse waveform of the electric signal output from the pickup 11, (bl is the pulse waveform of the electric signal output from the pickup 12. The phase is delayed. If we take the difference between the signal in (a) and the signal in peak), we can obtain the load torque signal shown in (C). In this signal, the pulse repetition period T(6) is It is constant if the rotation speed of the shaft body 1.2 is constant, but the pulse time width t is related to the phase difference between the (al and (bl) signals, that is, the load torque.

In the present invention, the means for detecting the rotation angle is not particularly limited, and any of electromagnetic type, rechargeable type, oscillation type, semiconductor type, etc. can be used.

FIGS. 5 and 6 are longitudinal sectional views showing other embodiments of the present invention. In this figure, elastic body seats 3a and 3b provided at both ends of the coil spring have a coil spring guide portion 3c provided at the center thereof.

3d is long in the direction of deflection of the coil spring, and when the deflection becomes larger than the maximum deflection, both guide portions 3C%3d come into contact to prevent the coil spring from coming into close contact. Note that FIG. 5 shows a state in a normal use range, and FIG. 6 shows a state in which maximum torque is generated.

Note that this device is small and can be mounted on a main body, and the detected torque can be used to control the ignition, air-fuel ratio, transmission, etc.

As explained above, the present invention is configured to limit the maximum deflection of the elastic body provided between the first shaft body and the second (7) shaft body, thereby preventing deterioration of the elastic body properties and damage. Furthermore, it is possible to detect with high accuracy within the allowable deflection range without compromising reliability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the torque detection device of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1, FIG. 3 is an enlarged sectional view of the surrounding area of the coil spring 4a, FIG. FIG. 6 is a sectional view of a main part showing another embodiment of the present invention. 1.2... Shaft body, 4... Elastic body, 3c, 3d...
Spring guide part (limiting mechanism), 6.7...Rotating body,
11.12...Big amplifier, 14.15...Protrusion (limiting mechanism). Representative Patent Attorney Takashi Okabe ・1 (8)

Claims (3)

[Claims] (1) A torque detection device that detects the amount of deflection of an elastic body interposed between a first shaft body driven by power and a second shaft body on the driven side connected to a load. A torque detection device comprising a limiting mechanism that prevents the amount of deflection of the elastic body from exceeding a predetermined amount of deflection. (2) When the torque acting on the torque detection device by the limiting mechanism matches the maximum deflection amount of the elastic body, the first shaft and the second shaft come into contact with each other. The torque detection device according to claim 1, characterized in that: (3) Claim 1 characterized in that the limiting mechanism acts as a stopper that comes into contact when the relative phase of the first shaft body and the second shaft body reaches a predetermined amount. Torque detection device described in. <4) The limiting mechanism is such that the two seats of the elastic body are mutually (1)
) The torque detecting device according to claim 1, wherein the torque detecting device is adapted to come into contact with the torque detecting device.