JPS58189535A - Measuring method of torque - Google Patents

Abstract

PURPOSE:To measure the transmission torque simply and surely without using a slip ring etc., by measuring the force given to an idle gear shaft by joining an input sahft and an output shaft with the idle gear. CONSTITUTION:The torque of a shaft 11 is transmitted to an output shaft 12 through a driving gear 21 of an input shaft 11, an idle gear 23 and a gear 22 to be driven of the shaft 12. The transmission torque is measured simply without using a slip ring, etc. and accurately without being affected by noise or friction by measuring the rotation torque of the gear 23 by a load cell 27.

Description

[Detailed description of the invention] The present invention relates to a torque measuring method.

For example, a method conventionally used to measure changes in transmitted torque in response to changes in various conditions of a rotating shaft, such as measuring load torque when a constant velocity joint is displaced, is shown in Figure 1. There are some things shown below. A tone bar 3 is provided between the input shaft 1 and the output shaft 2 concentrically therewith.

The toe 7 Yonbar 3 has a flange portion 3 a formed thereon.
is connected to the human power axis l and the output @2.

A strain gauge 4 is attached to the toe 7 bar 3 in order to detect the torsional tension of the tone bar 3 and measure the transmission torque. In order to take out the output of this strain gauge 4 to the outside, a bluff 7 is provided protruding from the tone yo/par 3 so that it slides into sliding contact with a slip ring 6 annularly fixed to the inner peripheral surface of the nozzle 5 that supports the tone yomber 3. ing.

(7) However, in this torque measurement method, since the slip ring 6 extracts the signal from the torsion point <-3 during rotation, noise may be mixed into the measurement signal, or the slip ring 6 may be affected by long-term use. There were various problems such as wear of the blank and wear of the blank.

The present invention has been made by focusing on the problems of the prior art as described above. An idle gear is provided so that it can move in the direction of force,
By measuring the force applied to the idle gear shaft with this idle gear attached, and measuring the transmitted torque between the internal shaft and the output shaft, the above-mentioned problem can be solved by measuring the torque. This provides a method for measuring torque.

An embodiment of the present invention will now be described with reference to FIGS. 2 and 3.

2 shows a longitudinal side view of an apparatus suitable for implementing the method of the present invention, and FIG. 3 shows a longitudinal sectional front view of the apparatus shown in FIG. 2. In this embodiment, an input shaft 11 rotated by a motor 10 is shown. A case is shown in which the transmission torque between shafts transmitted to the output shaft 12 is heat-resistant.

As shown in the figure, the motor 10 is attached to one substrate 14 of a case 16 that is composed of two substrates 13 and 14 and a cover 15 that covers between them. The input shaft 11 is supported by a bearing 18 on the substrate 13 on the opposite side, and is connected to the input shaft 11 by a key 19.

The output shaft 12 is parallel to the human power shaft 11, and is supported by a housing 20 fixed to a base plate 13, and the end of the main force III112 is located inside the case 16.

Human power 4!1111 integrated with the main shaft 17 of the Seven-Ta lO
A drive gear 21 is attached to the output shaft 12, a driven gear 22 is attached to the output shaft 12, and an idle gear 23 is meshed between the drive gear 21 and the driven gear 22.
Torque on the main side 117 of the motor IO is transmitted to the output shaft 12 via the idle gear 23. Therefore, the force that the idle gear 23 receives when it rotates is proportional to the transmitted torque.

The idle gear 23 is connected to the drive gear 2 by floating springs 24 and 24 in the case 16, as shown in FIG.
1 and the driven gear 22, that is, the direction of the force received by the third driven gear 22.
In the figure, it is rotatably attached to a supporter 25 supported movably in the horizontal direction via an idle gear shaft 26,
There is. This supporter 25 has one radial end of the idle gear 23 connected to the load cell 2 supported by the case 16.
is brought into contact with the load detection end 28 of No. 7 via the ball 29,
The other end of the supporter 25 is brought into contact via a ball 31 with a support receiving part 30 that holds the supporter 25 in a neutral position.

The support receiving portion 30 includes an outer cylinder 32 fixed to the case 16.
A pressure spring 33 is incorporated therein, one end of the pressure spring 33 contacts the receiving member 34 of the ball 31, and the other end is received by a preload adjustment screw 35 screwed to the outer cylinder 32. By rotating this adjustment screw 35, the set pressure of the pressure spring 33 can be adjusted. 37 is a lock nut for fixing the adjustment screw 35.

Since the present invention is based on the above configuration, the shaft torque of the motor 10 is transmitted to the idle gear 23 via the drive gear 21, and from this idle gear 23 to the driven gear 22. During this torque transmission, the distance between the shafts of the idle gear 23 is kept constant by the leaf springs 24 and 24, and there is no resistance to radial force, so the radial force generated in the idle gear 23 is transferred to the supporter 2.
5 to 1 is transmitted to the load detection terminal 28 of the load cell 27, and by measuring this, the transmission resistance can be measured.

As described in 1-1 above, the present invention provides an idle gear that is movable in the direction of the force received by the drive gear and the driven gear between the drive gear attached to the input shaft and the driven gear attached to the output shaft. The transmission torque between the input shaft and the output shaft can be measured by measuring the force applied to the idle gear shaft to which this idle gear is attached. This eliminates the problem of noise mixing in the measurement signal, reducing measurement accuracy, or (or wear). By making it possible to artificially apply a load to the supporter, the load cell can be easily calibrated, so that the calibration can be performed easily and accurately.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view showing the conventional torque measurement method;
The figure is a vertical side view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 3 is a vertical front view of the same. 10. Motor, 11.. Input shaft, 12.. Output shaft, 1
6...Case, 17...Main shaft, 21...Drive gear, 2
2... Driven gear, 23... Idle gear, 24...
Floating spring, 26... Idle gear shaft, 27... Load cell. Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] An idle gear is provided between a drive gear attached to a human power shaft and a driven gear disposed on the output shaft, and is movable in the direction of the force received by the drive gear and the driven gear. By measuring the force applied to the idle gear shaft to which the idle gear is attached, the torque transmitted between the human power shaft and the output shaft is measured. A measurement method characterized by: