JPH07318443A - Electric dynamometer - Google Patents

Abstract

PURPOSE:To provide an electric dynamometer downsized without spoiling high accuracy and load measuring capacity in a wide area. CONSTITUTION:An electric dynamometer is provided with an arm 25 arranged on a stator 22 to absorb motive power of a motive power generating source 1, a load detecting part 5 to detect a load through the arm and a display unit 58 to display the load, and the load detecting part contains a first load cell 511 arranged between a first rotary part of the arm and a bearing stand 3 through an elastic member 52, a contact member 53 oppositely arranged in a second rotary part of the arm through a clearance G1 and a second load cell 512 arranged between the contact member and the bearing stand, and load capacity of the first load cell is set smaller than load capacity of the second load cell, and a small load area is detected according only a load signal L11 of the first load cell, and a large load area is detected by combining a load signal L12 of the second load cell with it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric dynamometer for performing a bench test of a power generation source such as an engine, and more particularly to an electric dynamometer capable of performing a highly accurate test regardless of the capacity of the power generation source. The present invention relates to an electric dynamometer that has been downsized without impairing test performance.

[0002]

2. Description of the Related Art FIG. 11 shows, for example, JP-A-64-5713.
FIG. 8 is a cross-sectional view showing a conventional electric dynamometer shown in Japanese Patent Laid-Open No. 7-74, in which 1 is a power generation source to be tested, such as an engine. Reference numeral 2 denotes a power absorption portion of an electric dynamometer that absorbs the power of the engine 1, and includes a rotor 21 connected to a rotation shaft of the engine 1, a stator 22 arranged around the rotor 21, an inner circumference of the stator 22, and The bearing 23 is arranged on the outer circumference. A bearing stand 3 rotatably supports the rotor 21 and the stator 22 via a bearing 23.

FIG. 12 is a block diagram showing a state of the electric dynamometer shown in FIG. 11 as seen from the direction of the rotation axis of the rotor.
Is an arm connected to the stator 22. Reference numeral 4 denotes a load detection unit that measures the power of the engine 1 absorbed by the power absorption unit 2 via the arm 25, and includes the following elements 42 to 412.
It consists of

Reference numeral 42 denotes a tension and compression spring provided at the tip of the arm 25, 43 denotes a metal fitting arranged at the tip of the arm 25 for supporting the tension and compression spring 42, and 411 denotes a tension and compression spring 42 and the metal fitting 43. A relatively small first load cell 412 interposed therebetween is a relatively large second load cell interposed between the metal fitting 43 and the bearing stand 3.

Reference numerals 441 and 442 denote contact sensors provided at the tip of the metal fitting 43 facing the arm 25, and output a switching signal C to a switching device (which will be described later) when the arm 25 contacts the arm 25. Reference numerals 451 and 452 denote amplifiers for amplifying the load signals L1 and L2 from the load cells 411 and 412, respectively. A switch 46 operates in response to the switching signal C, and selects and outputs one of the load signals L1 and L2 amplified through the amplifiers 451 and 452.

Reference numeral 47 is a gain adjuster for adjusting the gain of the load signal L1 or L2 from the amplifier 451 or 152 via the switch 46, and reference numeral 48 is for displaying the load signal L1 or L2 via the gain adjuster 47. It is a meter.

Next, the operation of the conventional electric dynamometer shown in FIGS. 11 and 12 will be described. First, the power absorber 2 of the electric dynamometer absorbs the rotational power of the engine 1 via the rotor 21 and the stator 22 that rotate integrally with the engine 1. That is, the stator 22 facing the rotor 21 receives the torque reaction force generated from the engine 1.

As a result, the arm 25 rotates integrally with the stator 22 which is rotatably supported by the bearing base 3 via the bearing 23, and the arm 25 rotates through the tension and compression springs 42.
Load is applied to the load cell 411 of the
A load is applied to the second load cell 412 via the.

At this time, as shown in FIG. 12, since a predetermined clearance is provided between the arm 25 and the metal fitting 43,
As the arm 25 rotates, the tension and compression springs 42 bend and the load until the arm 25 contacts the metal fitting 43,
Which of the load signals L1 and L2 of the first and second load cells 411 and 412 is to be used is selected depending on the load after the arm 25 contacts the metal fitting 43.

The selection of the load signal L1 or L2 is performed as follows. That is, the switching device 46 is activated by the switching signal C from the contact sensors 441 and 442 at the tip of the fitting 43.
Is operated, and either of the load signals L1 and L2 via the amplifiers 451 and 452 is input to the gain adjuster 47 and further displayed on the meter 48.

For example, the load before the arm 25 contacts the metal fitting 43 is applied to the first load cell 411 via the tension and compression springs 42. In addition, a relatively large load after the arm 25 contacts the metal fitting 43 is
And to the second load cell 412 via the metal fitting 43. At this time, the arm 2 is attached to the first load cell 411.
The load corresponding to the clearance between 5 and the metal fitting 43 does not apply a load larger than the bending load of the tension and compression springs 42, so that the first load cell 411 having a small allowable load can be protected.

Thus, in the region where the load is small,
The load can be accurately measured by the first load cell 411, and the load can be continuously measured by the second load cell 412 in a region where the load is larger than that.

[0013]

As described above, the conventional electric dynamometer uses the first load cell 41 in order to perform a highly accurate test regardless of the capacity of the power source such as the engine 1.
Since the two load cells consisting of the first and second load cells 412 are arranged in series between the lower part of the arm 25 and the bearing stand 3, the height of the load detection unit 4 is increased and downsizing is realized. There was a problem that I could not do it.

The present invention has been made in order to solve the above problems, and realizes downsizing by reducing the height of the load detecting portion without impairing the measuring ability regardless of the magnitude of the applied load. The purpose is to obtain an electric dynamometer that does.

[0015]

An electric dynamometer according to claim 1 of the present invention is a rotor which rotates integrally with a power generation source on a bearing stand, and a rotor which is arranged so as to face the rotor and is rotatable on the bearing stand. Installed on the stator, which absorbs the power of the power generation source via the rotor, an arm integrally provided on the stator, a load detection unit for detecting a load according to the power via the arm, and the detected load In the electric dynamometer including a display for displaying, the load detection unit includes a first load cell installed via an elastic member between the first rotation unit of the arm and the bearing base, and the load detection unit of the arm. The load capacity of the first load cell includes a second load cell installed between the contact member and the bearing base, the contact member being opposed to the second rotating portion with a clearance. Is smaller than the load capacity of the load cell of The load smaller than the load is detected based on only the load signal from the first load cell, and the load equal to or more than the predetermined load is detected based on each load signal from the first and second load cells. .

An electric dynamometer according to a second aspect of the present invention is the electric dynamometer according to the first aspect, wherein the first rotating portion of the arm and the first
The elastic member interposed between the load cell and the load cell includes a fluid filled damper.

An electric dynamometer according to a third aspect of the present invention is the electric dynamometer according to the first or second aspect of the invention.
The elastic member interposed between the rotating portion and the first load cell includes compression springs provided above and below the first rotating portion of the arm.

An electric dynamometer according to a fourth aspect of the present invention is the electric dynamometer according to any one of the first to third aspects,
A clearance adjusting means for adjusting the clearance between the second rotating portion of the arm and the contact member is provided.

An electric dynamometer according to a fifth aspect of the present invention is the electric dynamometer according to any one of the first to fourth aspects.
A buffer member is provided between the second rotating portion of the arm and the contact member.

An electric dynamometer according to a sixth aspect of the present invention is the electric dynamometer according to any one of the first to fifth aspects,
The arms are arranged to face each other in the radial direction of the stator, and the first rotating portion is arranged to face the second rotating portion in the radial direction of the stator.

An electric dynamometer according to a seventh aspect of the present invention is the electric dynamometer according to any one of the first to sixth aspects.
A second elastic member disposed opposite to the third rotating portion of the arm via a second clearance; and a third load cell installed between the second elastic member and the bearing stand, The rotation amount of the arm due to the second clearance of the third rotation portion is set smaller than the rotation amount of the arm due to the clearance of the second rotation portion, and the load capacity of the third load cell is equal to the first load cell. Of the second load cell and smaller than the load capacity of the second load cell.

An electric dynamometer according to claim 8 of the present invention is the electric dynamometer according to any one of claims 1 to 7.
An AD converter for converting the load signal from the load detection unit into a digital signal, and an arithmetic processing unit for generating a load signal corresponding to the load displayed on the display based on the digital signal.

[0023]

According to the first aspect of the present invention, a plurality of load cells for measuring the load are arranged in parallel on the bearing stand to protect the first load cell having a small load capacity from the allowable load and to output from the plurality of load cells. Add each load signal to be added. Thus, in the load range smaller than the predetermined load, the load is measured based on the load signal from the first load cell having a small capacity, and in the load range equal to or more than the predetermined load, the load cells from the first and second load cells having different capacities are measured. The load is measured by the sum of the load signals. Therefore, the load is accurately measured by the first load cell having a small load capacity in the region where the load load is small, and the load is reliably measured by combining the second load cell having a large load capacity in the region where the load load is large, and the measurement capability is improved. The height of the load detection part can be reduced without impairing the size and downsizing can be realized.

Further, according to the second aspect of the present invention, a fluid-filled damper is interposed between the first rotating portion of the arm and the first load cell to suppress an impact load on the first load cell.

According to a third aspect of the present invention, a compression spring is interposed above and below the first rotating portion of the arm, and
Suppresses the impact load on the load cell.

According to the fourth aspect of the present invention, the protective load of the first load cell is set to an optimum value by adjusting the clearance between the second rotating portion of the arm and the contact member.

Further, according to a fifth aspect of the present invention, by providing a buffer member between the second rotating portion of the arm and the contact member, the load signal from the second load cell is stabilized and the load signal from the second load cell is stabilized. Protect the 2 load cell from impact load.

According to a sixth aspect of the present invention, the first rotating portion is arranged on one arm and the second rotating portion is arranged on the other arm opposed to each other in the radial direction of the stator. , Expand the flexibility of the placement space for each load cell.

Further, according to a seventh aspect of the present invention, the arm is provided with a third rotating portion through a second clearance which is smaller in rotation amount than a rotating amount due to a clearance of the second rotating portion.
By disposing the second elastic member so as to face each other and installing the third load cell having a load capacity intermediate between the load capacities of the first and second load cells, between the second elastic member and the bearing base. Expand the protection range and load measurement range of each load cell.

According to the eighth aspect of the present invention, the load signal from the load detector is converted into a digital signal and the load signal after the digital signal is processed is displayed to suppress a calculation error.

[0031]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a first embodiment of the present invention. In the figure, reference numerals 21, 21 to 23, 25 and 3 are the same as those described above. The basic configuration related to the engine 1 according to the first embodiment of the present invention is as shown in FIG.

5, 52, 53, 511 and 512 are
They correspond to the load detection unit 4, the tension and compression spring 42, the metal fitting 43, the first load cell 411 and the second load cell 412, respectively, and are 551, 552 and 58.
Corresponds to the amplifiers 451, 452 and the meter 48. Further, 561 and 562 are gain adjusters 47.
It corresponds to.

Reference numeral 5 is a load detecting section associated with the power absorbing section 2, and is composed of the following elements 511-53.
Reference numeral 511 is a first load cell having a relatively small load capacity, and is installed on the bearing stand 3 corresponding to the first rotation portion near the rotation center of the arm 25. Reference numeral 512 denotes a second load cell having a relatively large load capacity, which is installed on the bearing stand 3 corresponding to the second turning portion which is the tip of the arm 25. The arrangement relationship of the load cells 511 and 512 may be the reverse of the above, and the load cells 511 and 512 are arranged in parallel so as to be planarly positioned on the bearing stand 3.

Reference numeral 52 denotes a tension and compression spring having one end attached to the arm 25, and the other end having the first load cell 5
It is attached to 11. Reference numeral 53 denotes a metal fitting which is a contact member arranged with a predetermined clearance G1 with respect to the rotating direction of the arm 25, and is attached to the second load cell 512.

Reference numerals 551 and 552 denote load cells 511, respectively.
And the amplifiers for amplifying the load signals L11 and L12 from the amplifiers 512, 561 and 562 are gain adjusters for adjusting the gains of the load signals L11 and L12 via the amplifiers 551 and 552, and 57 is the gain adjuster 56.
Reference numeral 58 is an adder for adding the load signals L11 and L12 via 1 and 562, and 58 is a display such as a meter for displaying the load signal L3 added by the adder 57.

FIG. 2 shows the load signals L11 and L12 in FIG.
3 is a characteristic diagram showing changes in L3 and L3, and the horizontal axis represents a torque reaction force T corresponding to a load. Further, To is a predetermined torque reaction force at which the second load cell 512 acts to start outputting the load signal L2. Next, referring to FIG.
The operation of the first embodiment of the present invention shown in FIG.

As described above, since the stator 22 is rotatably supported by the bearing base 3, the torque reaction force received by the stator 22 from the engine 1 causes the arm 25 to rotate and pull and compress. The load is applied to the first load cell 511 via the spring 52, and is also applied to the second load cell 512 via the metal fitting 53.

At this time, since a predetermined clearance G1 is set between the arm 25 and the metal fitting 53, the load range in which the amount of rotation of the arm 25 is small, that is, the tension and compression springs 52 bend and the arm 25 causes the metal fitting 53 to move. The load (corresponding to a predetermined torque reaction force To or less) until it comes into contact with is applied only to the first load cell 511. Further, a load region where the amount of rotation of the arm 25 is large, that is, a load after the arm 25 contacts the metal fitting 53 (corresponding to a predetermined torque reaction force To or more).
Joins each load cell 511 and 512.

Therefore, by setting the clearance G1 between the arm 25 and the metal fitting 53 and the spring constant of the tension and compression spring 52, the load when the arm 25 contacts the metal fitting 53 (predetermined torque reaction force). (Corresponding to To) can be set.

For example, if the spring constant of the tension and compression spring 52 is set to be sufficiently smaller than the spring constant inside the second load cell 512, the tension and compression after the arm 25 comes into contact with the metal fitting 53 The increase in the amount of deflection of the compression spring 52 is extremely small. Therefore, the load received by the first load cell 511 does not increase so much, and the first load cell 511 having a small allowable load can be protected.

The load signals L11 and L12 output from the load cells 511 and 512 are individually amplified by the amplifiers 551 and 552, and further gain-adjusted individually by the gain adjusters 561 and 562. The gain adjusters 561 and 562 are provided for each load signal L.
The gain is adjusted so that the load signal L3 after adding 11 and L12 becomes a continuous signal. The load signal L3 from the adder 57 is input to the display device 58 and displayed as a measurement result.

Thus, each load cell 511 and 5
By arranging 12 on the bearing stand 3 in parallel, the load is accurately measured by the first load cell 511 in a region where the load load of the torque reaction force To or less is small, and the region where the load load of the torque reaction force To or more is large is measured. Then, the sum of the load cells 511 and 512 enables continuous and reliable measurement over a wide load range. Therefore, the height of the load detection unit 5 can be reduced and the overall configuration of the electric dynamometer can be downsized without impairing the load measurement capability.

Example 2. Although the arm 25 and the first load cell 511 are connected via the tension and compression springs 52 in the first embodiment, they may be connected via another elastic member. FIG. 3 shows the arm 25 and the first load cell 51.
2 is a configuration diagram showing Embodiment 2 of the present invention in which 1 and 1 are connected via a connecting rubber 521, for example. Thus, even if the connecting rubber 521 is provided instead of the tension and compression springs 52,
Similar to the above, the impact load can be damped and softened.

Example 3. 4 is a configuration diagram showing a third embodiment of the present invention in which a fluid-filled damper 522 is interposed in parallel with the tension and compression springs 52. in this way,
By connecting the fluid-filled damper 522 in parallel between the arm 25 and the first load cell 511,
Moreover, the damping is increased, and the impact load can be further reduced.

Example 4. Further, in each of the above embodiments, the elastic member (tensile and compression spring 52) is interposed only between the lower portion of the arm 25 and the bearing stand 3, but the elastic member (tensile and compression spring) is provided above and below the arm 25. May be interposed. FIG. 5 shows the tension and compression springs 52 above and below the arm 25.
4 is a configuration diagram showing Embodiment 4 of the present invention in which 3 is interposed, and 524 is a metal fitting for supporting a tension and compression spring 523.

In this case, the metal fitting 524 is placed on the first load cell 511, and the tension and compression springs 523 are positioned above and below the arm 25. Further, the tension and compression spring 523 may simply be a compression spring. As a result, the torque reaction force transmitted to the arm 25 is applied as a load from the tension and compression spring 523 to the first load cell 511 via the metal fitting 524, and the impact load can be damped and relieved as described above. .

Example 5. Further, in each of the above embodiments, the clearance G1 between the arm 25 and the metal fitting 53 is constant, but it may be adjustable. FIG. 6 is a configuration diagram showing a main part of a fifth embodiment of the present invention in which a clearance G1 between the arm 25 and the metal fitting 53 can be adjusted.

In FIG. 6, reference numeral 531 denotes a clearance adjusting mechanism for adjusting the clearance G1, which is provided on the upper and lower surfaces of the metal fitting 53 facing the arm 25, respectively. The clearance adjustment mechanism 531 includes a movable nut embedded in the metal fitting 53,
It is composed of bolts for fixing the movable nut, and has a screw type structure.

In this case, by adjusting the clearance adjusting mechanism 531, it is possible to change the deflection setting amounts of the tension and compression springs 52, and even if dimensional errors of each member and variations in spring characteristics occur, the first The protection load of the load cell 511 can be adjusted to an optimum value.

Example 6. Further, in each of the above-described embodiments, the arm 25 and the metal fitting 53 are brought into direct contact with each other, but a buffer member may be interposed between the arm 25 and the metal fitting 53. FIG. 7 is a configuration diagram showing a sixth embodiment of the present invention in which a cushioning member 533 is interposed between the arm 25 and the metal fitting 53. The cushioning member 533 (for example, rubber) vertically contacts the arm 25 of the metal fitting 53. It is provided on the surface.

In this way, the metal fitting 5 facing the arm 25
By providing the cushioning members 533 on the upper and lower surfaces of 3, the damping action when an impact load is applied is performed, and the impact can be softened. Therefore, the load signal L12 output from the second load cell 512 can be stabilized and the second load cell 512 can be protected.

Example 7. Further, in each of the above-described embodiments, the load cells 511 and 512 are configured to receive the load from the same arm 25, but the load cells may be configured to receive the load from different arms. FIG. 8 shows that the load cells 511 and 512 have different arms 251 and 252.
It is a block diagram which shows Example 7 of this invention which was made to receive the load from each.

In FIG. 8, the first load cell 511 and the tension and compression spring 52 are shown on one arm 251.
Disposed on the side, the second load cell 512 and the metal fitting 53
Is arranged on the other arm 252 side. In this way, for each of the arms 251 and 252 attached to the opposite side of the stator 22, each load cell 51
1, 512, tension and compression springs 52 and fittings 53
Even if they are individually provided, the same effect as each of the above-described embodiments can be obtained. In addition, the degree of freedom of the space for arranging the load detection unit 5 is increased.

Example 8. Further, in each of the above-described embodiments, the load measurement is performed by using the two load cells 511 and 512.
Although the load measurement is performed in three stages, the load measurement may be set in any number of stages using three or more load cells. FIG. 9 is a configuration diagram showing an eighth embodiment of the present invention in which the load measurement is performed in three stages by using, for example, three load cells 511 to 513.

In FIG. 9, 513 is the third arm 25.
Is a third load cell arranged on the bearing stand 3 corresponding to the rotating portion (for example, an intermediate position between the first and second rotating portions), and its load capacity is the load of the first load cell 511. It is set to be not less than the capacity and not more than the load capacity of the second load cell 512, for example, about the middle of the load capacity of each load cell 511 and 512.

Reference numeral 525 denotes a pair of compression springs, which are arranged to face each other in the vertical direction of the arm 25 with a predetermined second clearance G2, and 535 is placed on the third load cell 513 so that each compression spring 525 can be mounted. A metal fitting 553 is an amplifier for amplifying the load signal L13 output from the third load cell 513, and a reference numeral 563 is a load signal L via the amplifier 553.
13 is a gain adjuster that adjusts the gain of 13. Also,
The adder 57 is configured to add the load signals L11 to L13 via the gain adjusters 561 to 563.

The arm 25 with the second clearance G2
The amount of rotation of the arm 25 is set to be smaller than the amount of rotation of the arm 25 due to the clearance G1 between the metal fitting 53 and the arm 25 at the second rotating portion. Therefore, as shown in FIG.
When the third load cell 513 is installed at the intermediate position, G2 <G1.

In this case, first, in the small load region, the first load cell 511 is connected via the tension and compression springs 52.
Only the load is applied. Next, when the load increases and the amount of bending of the tension and compression springs 52 increases, and the amount of rotation of the arm 25 reaches or exceeds the second clearance G2, of the pair of compression springs 525 arranged above and below the arm 25. The arm 25 comes into contact with either of them, and the intermediate third load cell 513
Also, the load begins to be applied.

Furthermore, the load increases and the amount of deflection of the compression spring 525 increases, and the amount of rotation of the arm 25 increases by a gap G1.
If it becomes above, the arm 25 will contact the metal fitting 53, and a load will also start to be applied to the second load cell 512. Adder 57
Are the load cells 511 to 511 whose amplification and gain have been adjusted.
The load signals L11 to L13 from 513 are added, and the added load signal L3 is displayed on the display 58.

As described above, the load detection is performed in three steps according to the load area, and the load cells 511 to 513 that share the load in the predetermined load area automatically change the load distribution according to the load variation. , The first load cell 511 and the third load cell 5 having a relatively small load capacity
13 can be protected.

Therefore, three or more load cells 511
It can be seen that the same effects as described above can be obtained by using ~ 513. Further, in this case, the load measurement region and the protection region can be expanded as compared with the above-described respective embodiments.

Example 9. Further, in each of the above-described embodiments, the load signals L11 and L12 from the load cells 511 and 512 are gain-adjusted via the gain adjusters 561 and 562 and added by the adder 57. After the conversion, the load signal added may be generated by the arithmetic processing of a microcomputer (hereinafter referred to as a microcomputer).

FIG. 10 is a block diagram showing a ninth embodiment of the present invention using an AD converter and a microcomputer. In FIG. 10, reference numerals 591 and 952 denote AD converters inserted in place of the gain adjusters 561 and 562, and load signals L11 and L1 via the amplifiers 551 and 552, respectively.
2 is converted into a digital signal.

Reference numeral 593 is a microcomputer inserted in place of the adder 57, and the load signals L11 and L1 converted into digital signals via the AD converters 591 and 592.
2 is subjected to addition calculation processing, and the added load signal L3 is generated. In this way, the microcomputer 5 having the arithmetic function, which is converted into a digital signal by the AD converters 591 and 592,
Even if the load signal L3 added by 93 is generated, the same effect as the above is produced. Also, load signals L11 and L
Since the addition process of 12 is performed after AD conversion, the calculation error can be reduced.

[0065]

As described above, according to the first aspect of the present invention, the rotor which rotates integrally with the power generation source on the bearing stand, and the rotor which is disposed so as to face the rotor and is rotatable on the bearing stand. A stator that absorbs the power of the power generation source via the rotor, an arm that is integrally provided on the stator, and a load detection unit that detects the load according to the power via the arm,
In an electric dynamometer equipped with an indicator for displaying the detected load, the load detecting unit is a first load cell installed between the first rotating unit of the arm and the bearing stand via an elastic member. And a second load cell installed between the contact member and the bearing base, the contact member being opposed to the second rotating portion of the arm via a clearance, and the load capacity of the first load cell. Is set to be smaller than the load capacity of the second load cell, a load smaller than the predetermined load is detected based on only the load signal from the first load cell, and a load equal to or larger than the predetermined load is detected in the first and second loads. Since it is made to detect based on each load signal from the load cell of, it is possible to measure the load with high accuracy by the first load cell in the small load area.
In the heavy load area, the second load cell installed in parallel with the first load cell
It is possible to obtain reliable load measurement by combining the above load cells, and to obtain a compact electric dynamometer by reducing the height of the load detection part without impairing the measurement capacity regardless of the size of the load. There is.

According to claim 2 of the present invention, in claim 1, the elastic member interposed between the first rotating portion of the arm and the first load cell includes a fluid filled damper. Thus, there is an effect that it is possible to obtain an electric dynamometer that can realize downsizing without impairing the measuring ability and can suppress the impact load on the first load cell.

According to claim 3 of the present invention, in claim 1 or 2, the elastic member interposed between the first rotating portion of the arm and the first load cell is the arm member. Since the compression springs provided above and below the first rotating portion are included, the electric dynamometer that can be downsized without impairing the measurement capability and can suppress the impact load on the first load cell. There is an effect that can be obtained.

According to claim 4 of the present invention, in any one of claims 1 to 3, a clearance adjusting means for adjusting a clearance between the second rotating portion of the arm and the contact member. Since it has been equipped with, it is possible to obtain an electric dynamometer that can realize miniaturization without impairing the measuring ability and can set the protective load of the first load cell to an optimum value regardless of the specifications of each component. is there.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, since the buffer member is provided between the second rotating portion of the arm and the contact member,
Along with realizing miniaturization without compromising the measurement ability,
There is an effect that an electric dynamometer capable of stabilizing the load signal from the second load cell and protecting the second load cell can be obtained.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the arms are arranged so as to face each other in the radial direction of the stator, and the first rotating portion includes the second rotating portion.
Since it is arranged in the radial direction of the stator so as to face the rotating part of the electric dynamometer, it is possible to achieve miniaturization without impairing the measuring ability and to expand the degree of freedom in the arrangement space of each load cell. effective.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the second arm disposed opposite to the third rotating portion of the arm via the second clearance.
Elastic member and a third load cell installed between the second elastic member and the bearing stand, and the amount of rotation of the arm due to the second clearance of the third rotating portion is the second rotation. The load capacity of the third load cell is set to be smaller than the rotation amount of the arm due to the clearance of the moving part, and is set to be larger than the load capacity of the first load cell and smaller than the load capacity of the second load cell. Therefore, it is possible to obtain an electric dynamometer that realizes miniaturization without impairing the measurement capability and expands the protection range and load measurement range of each load cell.

An electric dynamometer according to claim 8 of the present invention is the electric dynamometer according to any one of claims 1 to 7.
Since the AD converter for converting the load signal from the load detection unit into a digital signal and the arithmetic processing means for generating the load signal corresponding to the load displayed on the display based on the digital signal are provided, the measurement capability is improved. There is an effect that the miniaturization can be realized without loss and an electric dynamometer in which a calculation error is suppressed can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a change in each load signal with respect to a torque reaction force according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a third embodiment of the present invention.

FIG. 5 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram showing a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram showing an eighth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a ninth embodiment of the present invention.

FIG. 11 is a sectional view showing a basic configuration of a general electric dynamometer.

FIG. 12 is a configuration diagram showing a conventional electric dynamometer.

[Explanation of symbols]

2 power absorber, 21 rotor, 22 stator, 2
5, 251, 252 arms, 3 bearing bases, 5 load detectors, 511 first load cells, 512 second load cells, 513 third load cells, 52 tension and compression springs (elastic members), 522 fluid filled dampers,
523 compression spring, 525 compression spring (second elastic member), 53 metal fittings (contact member), 531 clearance adjustment mechanism, 533 cushioning member, 561, 562 gain adjuster, 57 adder, 58 indicator, 591, 592A
D converter, 593 microcomputer (arithmetic processing means), G1
Clearance, G2 Second clearance, L11 to L13 load signal, L3 added load signal, T torque reaction force corresponding to load, To predetermined torque reaction force corresponding to predetermined load.

Claims (8)

[Claims] 1. A rotor that rotates integrally with a power generation source on a bearing stand; a rotor that is disposed so as to face the rotor and is rotatably installed on the bearing stand; and the power of the power generation source through the rotor. A stator that absorbs the load, an arm that is provided integrally with the stator, a load detection unit that detects a load according to the power via the arm, and an indicator that displays the detected load. In the electric dynamometer, the load detection unit includes a first load cell installed between the first rotation unit of the arm and the bearing base via an elastic member, and a second rotation of the arm. And a second load cell installed between the contact member and the bearing base, wherein the load capacity of the first load cell is the second load cell. Less than load capacity of load cell The load smaller than the predetermined load is detected based on only the load signal from the first load cell, and the load equal to or more than the predetermined load is detected in each load signal from the first and second load cells. An electric dynamometer characterized by being detected based on. 2. The electric dynamometer according to claim 1, wherein the elastic member interposed between the first rotating portion of the arm and the first load cell includes a fluid filled damper. 3. The elastic member interposed between the first rotating portion of the arm and the first load cell includes compression springs provided above and below the first rotating portion of the arm. The electric dynamometer according to claim 1 or 2, wherein 4. The electric appliance according to claim 1, further comprising clearance adjusting means for adjusting a clearance between the second rotating portion of the arm and the contact member. Dynamometer. 5. A buffer member is provided between the second rotating portion of the arm and the contact member.
An electric dynamometer according to any one of claims 1 to 4. 6. The arm is arranged to face the radial direction of the stator, and the first rotating portion is arranged to face the second rotating portion in the radial direction of the stator. The electric dynamometer according to any one of claims 1 to 5, which is characterized. 7. A second elastic member, which is arranged to face the third rotating portion of the arm via a second clearance, and is installed between the second elastic member and the bearing base. A third load cell, wherein a rotation amount of the arm due to a second clearance of the third rotation portion is set to be smaller than a rotation amount of the arm due to a clearance of the second rotation portion, The load capacity of the third load cell is set to be larger than the load capacity of the first load cell and smaller than the load capacity of the second load cell. One of the electric dynamometers. 8. An AD converter for converting a load signal from the load detector into a digital signal, and an arithmetic processing means for generating a load signal corresponding to the load displayed on the display based on the digital signal. The electric dynamometer according to any one of claims 1 to 7, further comprising: