JPS62105023A - Torque detector - Google Patents

Abstract

PURPOSE:To simplify preparatory work at the time of measuring actual vehicle generating output by interposing a member which generates a torsional strain at the time of transmitting torque between an output rotation axis and a power transmission means and detecting the torsional strain. CONSTITUTION:The torque transmitted from an engine to a countershaft is transmitted from a drive sprocket 6 which is formed to a free end part 7a of an outside cylindrical member 7 via an inside cylindrical member 5 and the outside cylindrical 7 to a driving wheel. Further, the torque from the driving wheel is transmitted in the opposite way. Then, at the time of transmitting the torque, the torsion is generated on the inside cylindrical member 5 and the outside cylindrical member 7. Further, a resistant-wire strain gage 11 which generates an electrical signal in accordance with the torsional strain is stuck to an outside peripheral wall of the inside cylindrical member 5. The electrical signal generating on the resistant-wire strain gage 11 is taken out via a slip ring held between an signal taking-out wire 12 and a flange member 9. In this way, preliminary work is completed by only replacing the power transmission means such as the drive sprocket and a torque detector and the preliminary work for measuring the actual vehicle generating output can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a torque detection device for detecting torque of an output rotating shaft.

1119 When finalizing the specifications of power transmission system parts for motorcycles, etc., it is extremely important to conduct extensive driving tests and measure the output generated by the vehicle's engine (hereinafter referred to as actual vehicle output measurement). .

Conventionally, this measurement of the output generated by an actual vehicle has been carried out by attaching a so-called resistance wire strain gauge to a rotating shaft or the like that causes torsional strain inside the engine or transmission, and measuring the torque applied to the rotating shaft. On the other hand, the engine and transmission of a motorcycle have a crankshaft 1. A main shaft 2 of the transmission and a countershaft 3, which is an output rotating shaft of the transmission, are housed in an integrated crankcase 4, resulting in a complex structure.

Therefore, every time we measure the output generated by an actual vehicle, we have to disassemble and assemble the engine and transmission, install the resistance wire strain gauge, and calibrate the resistance wire strain gauge to set the reference value, which is very time-consuming. I was forced to do some preparatory work.

1 riμM Therefore, in view of the above-mentioned points, the present invention aims to provide a torque detection device that simplifies the preparation work when measuring the output generated by an actual vehicle.

In the torque detection device according to the present invention, the output rotating shaft protrudes outward from the crankcase and the power transmitting means connects to the outwardly protruding end of the output rotating shaft and transmits power to the drive wheels. , a configuration is adopted in which a member that generates torsional distortion during torque transmission is interposed, and the torsional distortion is detected.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 shows a torque detection device according to the present invention. In the torque detection device according to the present invention shown in FIG. 2, an inner cylindrical member 5 is fitted into an end portion 3a of the countershaft 3 as an output rotating shaft shown in FIG. have. The inner cylindrical member 5 is open at one end 5a, and fits into the end 3a of the countershaft 3 at the opening. counter shaft 3
A spline is formed on the end portion 3a so that a drive sprocket 6 serving as a power transmission means for transmitting power to a drive wheel (not shown) can be fitted therein. A protrusion corresponding to the spline is provided on one end 5a of the inner cylindrical member 5, and the inner cylindrical member 5 is fitted onto the countershaft 3 by engaging the protrusion with the spline (hereinafter referred to as spline connection). As a result, slippage in the circumferential direction between the inner cylindrical member 5 and the countershaft 3 is prevented. An outer cylindrical member 7 is fitted onto the other end 5b of the inner cylindrical member 5.

The fitting portion of the outer cylindrical member 7 and the inner cylindrical member 5 is also spline-coupled like the fitting portion of the inner cylindrical member 5 and the countershaft 3, but the fitting portion of the outer cylindrical member 7 and the inner cylindrical member 5 is Alternatively, it may be a bolt connection, a key connection, or the like. The outer cylindrical member 7 has a free end 7a that extends to the vicinity of one end 5a of the inner cylindrical member 5 without engaging the inner cylindrical member 5, and the free end 7a has a drive sprocket 6 as a power transmission means, for example. It is formed in one piece. The power transmission means may be any suitable for the drive system of the test vehicle, such as a chain drive system or a belt drive system, and does not need to be formed integrally with the outer cylindrical member 7. In order to prevent the inner cylindrical member 5 from falling off the countershaft 3, a stopper 8 is attached to the countershaft 3 at its tip.
It is connected to the end 3a of. The cylindrical stopper 8 has a flange portion 8a at its indented end that prevents the inner cylindrical member 5 from falling off.
It has a protrusion corresponding to the spline of a. The stopper 8 prevents the inner cylindrical member 5 from falling off by inserting the protrusion along the spline and then slightly shifting the protrusion along the groove carved along the outer periphery of the end portion 3a. be.

The collar portion 8a of the stopper 8 and the flange member 9 screwed onto the other end 5b of the inner cylindrical member 5 are fastened to the outer cylindrical member 7 by, for example, bolts 10.

Torque directed from the engine (not shown) to the countershaft 3 is transmitted to the inner cylindrical member 5. Via the outer cylindrical member 7, the power is transmitted from a drive sprocket 6 formed at the free end 7a of the outer cylindrical member to a drive wheel (not shown). Torque from the drive wheels is transmitted in the opposite direction. During this torque transmission, torsional strain occurs in the inner cylindrical member 5 and the outer cylindrical member 7. A so-called resistance wire strain gauge 11 is attached to the outer peripheral wall of the inner cylindrical member 5 as a transducer that generates an electric signal corresponding to this torsional strain. A signal output line 12 is connected to the resistance wire strain gauge 11, and the signal output line 12 passes through the radial through holes 5G and 8b of the inner cylindrical member 5 and the stopper 8, and connects to the slip ring held by the flange member 9 (Fig. (not shown). The electrical signal is extracted via the slip ring. Note that instead of the slip ring, a rotary transformer may be used which can extract the electrical signal without contact through magnetic coupling using mutual induction, or a so-called FM telemeter may be used to extract the electrical signal by electromagnetic waves. It is also possible to take out the .

Further, although a resistance wire strain gauge is used as the transducer, the present invention is not limited to this. (The transducer may be attached to any location where torsional strain occurs during torque transmission.

As shown in FIG. 2, interposing, for example, needle rollers 13 between the outer periphery of one end 5a of the inner cylindrical member 5 and the inner periphery of the free end 7a of the outer cylindrical member 7 reduces friction between the two. This is preferable because it can reduce the noise and improve measurement accuracy. Needle roller 13
are positioned between them by a collar 14.

Further, a dust seal 15 is provided to prevent dust from clogging the needle rollers 13.

Further, it is desirable to provide a gap between the above-mentioned spline-connected parts to prevent excess stress from being generated in the joined members.

Effects of the Invention As described above, in the torque detection device according to the present invention described above, the output rotating shaft protrudes outward from the crankcase and the output rotating shaft is coupled to the outwardly protruding end portion of the output rotating shaft to transmit power to the drive wheels. By interposing a member that generates torsional distortion during torque transmission between the power transmission means and making it possible to detect the torsional distortion, instead of the conventional preparation work when measuring the output generated by an actual vehicle, It is only necessary to replace the power transmission means such as the drive sprocket and the torque detection device according to the present invention, and the preparation work for measuring the output generated by an actual vehicle can be greatly simplified.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a crankcase of a motorcycle, and FIG. 12 is a diagram showing a torque detection device according to the present invention. Explanation of symbols of main parts 3... Counter shaft 5 as output rotation axis
... Inner cylindrical member 6 ... Sprocket 7 as a power transmission means.
...Outer cylindrical member 11...Resistance wire strain gauge 13 as a transducer...Needle roller

Claims (2)

[Claims] (1) An inner cylindrical member that is open at one end and fits into the end of the output rotating shaft at the opening, and one end of which fits externally into the other end of the inner cylindrical member, and the one end of the inner cylindrical member. an outer cylindrical member having a free end that extends to the vicinity without engaging the inner cylindrical member; a power transmission means coupled to the free end; and torsional strain occurring in the inner cylindrical member or the outer cylindrical member. A torque detection device characterized by having a transducer that generates an electric signal according to. (2) The torque detection device according to claim 1, wherein a roller is interposed between the outer periphery of one end of the inner cylindrical member and the inner periphery of the free end of the outer cylindrical member. .