JP2558361Y2 - Torque detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detector configured as a coupling used for connection with a rotating machine.

[0002]

2. Description of the Related Art In general, torque measurement is an important item in a rotating machine, for example, a prime mover, an electric motor, a power transmission, and a vehicle test apparatus using the same.

Conventionally used torque detectors include a strain gauge type, a magnetic type, a magnetic phase difference type, and the like. In any of these, a detection unit is provided on a rotating shaft, and the detection unit is received by a bearing to detect torque during rotation. The strain gauge type includes a contact type using a slip ring and a non-contact type using a rotary transformer in order to output a measured value. The gauge type torque detector will be described.

In this method, a strain gauge 2 is attached to a detection thin shaft portion of a detection shaft 1. The detection shaft 1 is rotatably supported by the main body 4 via the bearing 3. At the same time, a rotary transformer 5 is mounted between the detection shaft 1 and the main body 4 so that a current signal of the strain gauge 2 is externally detected.

[0005] The torque detector constructed as described above is used by being mounted on a performance test apparatus using an engine as a test body as exemplified in FIG. That is, the specimen 6
A torque detector 8 is connected to the main shaft via a connection shaft 7, a flywheel 10 is connected to the torque detector 8 via a coupling 9, and a power absorber 12 is connected and mounted in series via a coupling 11. And use it.

[0006]

In the conventional torque detector as described above, a coupling is required for connection between the torque detector and the rotating machine. Therefore, a large space for installing the torque detector and the coupling is required. There was a problem that an installation space was required. Furthermore, when the strength and rigidity of the torque detector are improved, the detector itself becomes larger,
There was a problem that a wider installation space was required.

The present invention has been made in view of the above circumstances, and has as its object to newly provide a torque detector which does not require a large installation space and has improved strength and rigidity.

[0008]

According to the torque detector of the present invention, a thin portion is formed around a connection end of a coupling inserted into a rotating shaft, and a strain gauge is formed on an outer periphery of the thin portion. , A bearing is arranged between the thin portion and the rotating shaft, and a current signal of the strain gauge can be externally detected by a non-contact type transmission means provided in the coupling.

[0009]

With the above construction, the torque can be detected with high accuracy by the thin-walled strain gauge near the end of the rotating shaft, and the bending stress applied to the thin-walled portion is supported by the bearing. Therefore, there is an effect that the rigidity of this portion is strengthened and disturbance can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the torque detector according to the present invention will be described below with reference to FIGS. Note that FIGS. 1 and 2
, Parts corresponding to those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a longitudinal sectional view of the torque detector of the present embodiment, in which 2 is a strain gauge, 5 is a rotary transformer, and 13 is a shaft portion.

The shaft portion 13 includes a rotating machine (not shown),
For example, a flywheel or a shaft of a gear train. The coupling 14 is directly inserted into the shaft portion 13. The coupling 14 is provided with a flange portion 14a as shown in FIG. 2 for connection to another rotating shaft. The flange portion 14a has a round hole 1 through which a connection screw is passed.
5 are drilled in large numbers.

The coupling 14 has its flange 1
A partial thin portion 14b for detecting shear strain due to torque is formed near the 4a-side port, and the strain gauge 2 is attached on the outer peripheral surface thereof. The mouth of the flange 14 a of the coupling 14 is supported by the shaft 13 via the center bearing 16. Accordingly, when a load other than the rotation torque is applied to the end of the coupling 14 on the flange portion 14a side, the external force is applied to the center bearing 1
6 prevents rocking, and prevents external force from exerting an effect of bending on the thin-walled portion 14b to increase the stress, thereby enabling accurate torque detection.

A rotary transformer 5 is mounted on the coupling 14 as a non-contact transmission means. This is because the rotor core 1 installed on the outer periphery of the coupling 14
7 and a stator core 18 arranged on the outer peripheral portion thereof, and is configured to be connected to an external device in order to supply current to the strain gauge 2.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various other configurations can be adopted without departing from the scope of the present invention.

[0015]

As described in detail above, according to the torque detector of the present invention, the flange of the coupling inserted into the rotating shaft is provided.
A thin portion is formed in the vicinity of the portion, a strain gauge is attached to the outer peripheral surface of the thin portion, a bearing is arranged between the flange portion and the rotating shaft, and the rotor core is provided on the side opposite to the flange portion of the coupling.
Contactless rotary transformer consisting of a stator core
Since the current signal of the strain gauge can be detected externally by the former , the torque detector and the coupling can be used in combination.
This has the effect of reducing the space in which the devices are installed, and reducing the size of the entire device. In addition, the distortion game
Di are those attached to the end of the rotary shaft, couplings
Since the thin portion of the ring is supported by the bearing, there is an effect that the torque can be detected with high accuracy, the bending rigidity is enhanced, and high-precision measurement with little disturbance can be performed. Further, there is an effect that an inexpensive product can be provided because the structure is simple and bearings are not frequently used.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a torque detector according to the present invention.

FIG. 2 is a left side view of the embodiment.

FIG. 3 is a longitudinal sectional view illustrating a conventional torque detector.

FIG. 4 is a schematic explanatory view illustrating an engine test apparatus using the conventional torque detector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Detection axis, 2 ... Strain gauge, 5 ... Rotary transformer, 8 ... Torque detector, 13 ... Shaft part, 14 ... Coupling, 16 ... Center bearing, 17 ... Rotor core, 18 ... Stator core.

Claims (1)

(57) [Scope of request for utility model registration] 1. A coupling is inserted into an end of a rotating shaft,
All around the flange near the flange of the coupling.
A thin part is formed, and a strain gauge is formed on the outer peripheral surface of the thin part.
And attach the rotor core connected to the strain gauge.
While attaching to the outer peripheral surface on the side opposite the flange of the pulling,
Surrounding the rotor core, a rotary transformer
Provide the stator core to be configured and the coupling flange
A torque detector characterized in that a bearing is interposed between a part and a rotating shaft .