JP2000019074A - Chassis dynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-use chassis dynamometer for drastically improving the working efficiency of a load cell calibration. SOLUTION: In a chassis dynamometer, a bracket installation part 12 is connected to the upper portion of a dynamo body 1, a bracket with a calibration arm is removably mounted on the bracket installation part 12 through an opening, a weight hanger 19 for receiving weights W that a traveling truck 21 is provided so that it can be elevated one by one reversibly along with descent is provided at both the ends of the above calibration arm, at the same time a positioning means 32 of the traveling truck 21 for a hanger 19 is provided at the weight transfer site of a pit cover 10, and a pit cover part 10a including the positioning means 32 is constituted so that the front and rear can be reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention simulates a state in which a test vehicle is traveling on an actual road surface so that a dynamic traveling performance test of the test vehicle can be performed in a real vehicle traveling state. More specifically, the present invention relates to an improved technique of a chassis dynamometer which has already been proposed by the present applicant in Japanese Patent Application No. 9-185793 (however, this is not a publicly known public use).

[0002]

2. Description of the Related Art In a chassis dynamometer, it is necessary to periodically calibrate a torque measuring system. Therefore, a load cell calibration for this purpose is performed with a test vehicle removed from a roller. This is done as follows.

[0003] First, an operator enters the pit, sets the calibration arm on the load cell side of the dynamo main body, performs zero adjustment of the amplifier connected to the load cell, and then weighs, for example, 20 kg. A predetermined number of weights (for example, 22) on the weight hanger at the tip of the calibration arm, adjust the span of the amplifier, and check the calibration value while watching + on the remote control connected to the load display. (The value of the force applied to the load cell) is recorded in a data format.

Next, while removing all the weights from the weight hanger, and then placing the weights one by one on the weight hanger, each time one weight is added, the calibration value is recorded in a data format while looking at the + display of the remote controller. The calibration values corresponding to the number of weights are written in a table, and a linearity graph is drawn.

[0005] Then, to eliminate all weights,
Remove the weights one by one from the weight hanger. At this time, each time one weight is removed, record the calibration value in the data format while looking at the + display on the remote control, and draw a graph of linearity. Correct the torque measurement system from linearity and hysteresis, and then
The calibration arm is removed from the dynamo main body, and the calibration arm is set horizontally on the arm fixed portion on the side opposite to the load cell. Thereafter, the same operation as above is repeated.

[0006] However, a worker enters the pit,
Attach the calibration arm to the dynamo body, and put a lot of heavy weights on the hanger of the arm and remove it repeatedly for a total of four times. For this reason, the workability was poor, and the work of load cell calibration was not easy.

On the other hand, in a chassis dynamometer according to Japanese Patent Application No. 9-185793, a bracket installation portion is connected to an upper portion of a dynamo body having a load cell for measuring torque of a roller in a state where the bracket installation portion is accommodated in a pit. An opening facing the bracket installation portion is formed in the pit cover, and a bracket having a horizontal calibration arm perpendicular to the rotation axis of the roller is detachably provided in the bracket installation portion through the opening. ,
In addition, a weight hanger that reversibly receives one weight at a time as the mobile trolley can move up and down, one by one,
A load cell calibration device is provided at both ends of the calibration arm so that the load cell calibration can be performed in a large floor space with good workability.

That is, since the chassis dynamometer is entirely contained in the pit and does not require a test vehicle at the time of load cell calibration, the test vehicle is moved to another space. As a result, a situation where nothing is present easily appears on the upper surface of the pit cover.

Therefore, according to the load cell calibration device having the above configuration, the bracket having the calibration arm is attached to the bracket installation portion facing through the opening, and the movable trolley is attached to the end of the calibration arm at the position where the weight is transferred to the hanger. Is moved to raise and lower the weights of the movable trolley, so that the work of placing and removing the weights one by one on the hanger can be easily performed in a large floor space with good workability.

[0010]

However, there is room for improvement in that the work of placing the weight on the hanger by the movable trolley is rather difficult.

In other words, when the weight is placed on the weight, it is important to align a plurality of weights of the movable carriage with respect to the weight hanger on the calibration arm side in a predetermined manner. At present, it is easy for the truck to be inclined with respect to the weight hanger or to be displaced in the front-rear direction or the left-right direction, and the moving truck is repeatedly moved forward, backward, left and right.

[0012] In particular, when the pit cover is made of a striped steel plate in consideration of anti-slip, the striped ridges make it more difficult to finely position the movable cart.

The present invention has been made in view of such circumstances, and in the already proposed chassis dynamometer, delicate positioning of a movable carriage can be easily performed, thereby further improving usability. The purpose is to let them.

[0014]

The technical means adopted by the present invention to achieve the above object are as follows. That is, proposed by Japanese Patent Application No. 9-185793, and
In the above-mentioned chassis dynamometer, the pit cover is provided with positioning means for the movable carriage with respect to the hanger at a weight replacement portion of the pit cover, and the pit cover portion including the positioning means is configured to be reversible. (Claim 1).

The positioning means includes, for example, a position regulating member for moving the carriage in the left-right direction, and a guide for introducing the movable carriage between the position regulating members.
Therefore, by moving the mobile trolley along the guide and pushing it between the position regulating members, the position of the mobile trolley can be adjusted only in the front-rear direction. The multiple weights that the truck has
It is possible to easily perform the predetermined alignment with respect to the weight hanger on the calibration arm side.

In particular, as described in claim 3, the positioning means includes a position regulating member in the left-right direction of the movable cart, a guide for introducing the movable cart between the position regulating members, and a regulation of the introduction position of the movable cart. In the case where the movable trolley is configured from the members, the position adjustment in the front-rear direction is also unnecessary, that is, the movable trolley is simply pushed between the position restricting members so that the movable trolley is brought into contact with the introduction position restricting member. Street alignment is readily possible.

When the pit cover is made of a striped steel plate, the positioning means is provided on the flat surface of the back surface of the pit cover, so that the delicate positioning of the movable carriage can be easily performed. By inverting the front and back of the pit cover portion including the positioning means to hide the positioning means in the pit, the positioning means does not obstruct the running or walking of the test vehicle.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a chassis dynamometer installed so as to be accommodated in a pit P and a load cell calibration device provided on a dynamo body for work on the floor. The details of these are described in Japanese Patent Application No. Hei 9-185793.
As a reference, the configuration of the chassis dynamometer and the load cell calibration device, which are the main parts of the present invention,
The operation of the load cell calibration will be described below.

In FIG. 1, reference numeral 1 denotes a dynamo body provided with a motor (not shown). Both ends of a main shaft 2 are supported by bearings 4 and 4 erected on a base 3. Reference numerals 5 and 5 denote rollers attached to both ends of the main shaft 2, reference numeral 7 denotes a load cell for measuring the torque of the rollers 5 and 5, and a bracket 9 connected to one side of a dynamo case 8 and the base 3. It is provided between.

Reference numeral 10 denotes a pit cover, and the rollers 5, 5
An opening 11 for exposing the test vehicle is formed. A driving wheel of the test vehicle is mounted on the exposed peripheral surfaces of the rollers 5 and 5 through the opening 11, and the driving wheel is mounted on an engine mounted on the test vehicle. By driving and rotating the rollers 5, 5, a dynamic running performance test of the test vehicle is performed in a real vehicle running state.

Numeral 12 denotes a bracket installation portion, as shown in FIG. 4, which is connected to the upper portion of the dynamo main body 1 in a state of being housed in the pit P, and is a bridge comprising a horizontal portion 13a and a leg portion 13b. It comprises a support member 13 having a shape and a horizontal member 14 above the support member 13.

Reference numeral 15 denotes an opening formed in the pit cover 10 so as to face the bracket installation portion 12, and an openable / closable lid 16 is provided.
Is provided. Reference numeral 17 denotes a bracket which is detachably provided on the bracket installation portion 12 through the opening 15 and has a horizontal calibration arm 18 orthogonal to the rotation axis of the rollers 5 and 5 arranged in a centrally distributed manner.

Numerals 19, 19 are weight hangers provided at both ends of the calibration arm 18, and locking pieces b are provided at both ends of a horizontal surface portion a as shown in FIG. Through the notch 20 formed by opening,
The weight W is configured to be locked and held movably up and down.

In this embodiment, the vertical distance from the upper surface of the pit cover 10 to the center axis of the calibration arm 18 is set to, for example, 250 mm. The operation of opening the bracket 17 and attaching the bracket 17 to the bracket installation portion 12 and the operation of setting the calibration arm 18 on the bracket 17 can be easily performed in the large floor space above the pit cover 10.

Reference numeral 21 denotes a weight setting movable cart, which can be moved on the pit cover 10 by hand pushing to a position straddling the weight hanger 19 as shown by a virtual line in FIG.

Hereinafter, the movable carriage 21 and the weight W will be described with reference to FIGS. 6 and 7. First, the weight W is formed in a rectangular plate as shown in FIG. 20, and a pair of long holes 22, 22 formed so as to sandwich the notch 20 and along the longitudinal direction of the notch 20.

On the other hand, the movable cart 21 is a cart body 25 having a pair of front and rear moving caster wheels 23 and 24 on the left and right.
And a leg 27 erected on the bogie main body 25 with a lifting mechanism 26 such as a jack, and a pair of weight suspension arms 29, 2 provided on the lower end side of a lifting member 28 of the lifting mechanism 26.
9 and a screw type stopper 30 which is movable up and down in the vertical direction is provided between the caster wheels 23 and 24.

The weight suspending arm 2
The upper edges of 9, 29 are formed on the inclined surface portion c which becomes lower toward the free end side, and the falling end locking pieces d of the weight W are provided on the free end side, and each of the inclined surface portions c, c is provided with: A predetermined number (11 in this embodiment) of weights W having a standard mass of 20 kg each is weighed by the long holes 22, 22.
And are vertically movably locked and held via the.

The weight suspending arms 29, 2
In a state where the weights 9 are inserted into the elongated holes 22, 22, the notches 20 of the weight W and the lengths of the elongated holes 22, 22 are so arranged that the weights W lowered by the operation of the handle 31 are successively placed on the weight hanger 19 one by one. And the long holes 22, 22
Of the notch 20 is set.

In the chassis dynamometer having the above-described configuration, in order to perform the load cell calibration, first, the operator firstly operates the lid 1.
6, the bracket 17 is set on the bracket installation portion 12 through the opening 15, and the bracket 17
The calibration arm 18 is fixedly installed at the upper part of the unit so as to be distributed in the center, and zero adjustment of the amplifier is performed by a computer.

Subsequently, while straddling the weight hanger 19 on the load cell side, the movable carriage 21 is moved so that the weight suspending arms 29 having right and left eleven weights W are located immediately above the weight hanger 19 [FIG. (A)],
Here, the handle 31 is fully turned, the weight suspending arms 29, 29 are lowered at a stretch, and all the weights W are mounted on the weight hanger 19, and the span adjustment of the amplifier is performed by a computer.

Next, the handle 31 is turned in the reverse direction to raise the weight suspending arms 29, 29 at a stretch, and all the weights W are removed from the weight hanger 19, and thereafter, the weight suspending arms 29, 29 are lowered. ,
As shown in FIG. 8B, weights W, W are placed one by one from the left and right outer sides on both ends of the weight hanger 19, and the calibration values of the weights W, W are read into the computer one by one. To make it happen.

When the reading is completed, the handle 31 is turned in the reverse direction to reduce the weight W one by one. Each time, the calibration value is read by the computer.
The linearity and hysteresis of the calibration curve are calculated by a computer.

Next, the worker moves the carriage 21 from the load cell side to the non-load cell side, performs the same calibration as described above, and causes the computer to calculate the linearity and hysteresis of the calibration curve.

Therefore, according to the chassis dynamometer having the above structure, the operator moves the movable carriage 21 to the weight replacement portion on the pit cover 10 and raises and lowers the weight W provided on the movable carriage 21. Weight hanger 19 without carrying weight W at all
The work of placing and removing the weight W can be easily performed in a large floor space with good workability. In addition, data reading, calculation of the linearity of the calibration curve, etc., and determination of the zero span value are performed. In addition, the correction can be automated, and the operation time of the load cell calibration can be reduced.

Here, in the present invention, as shown in FIGS. 1 to 3, a plurality of weights W provided on the movable carriage 21 can be positioned in a predetermined manner with respect to the weight hanger 19 on the calibration arm 18 side. The pit cover 10 is provided with a positioning means 32 for the movable carriage 21 with respect to the hanger 19 at a weight replacement portion, and the pit cover portion 10a including the positioning means 32 can be turned upside down.

More specifically, as shown in FIG. 9, an opening 33 is formed in the pit cover 10 at a position where the weight is transferred by the movable carriage 21, and around the opening 33, a receiving member 34 of the pit cover portion 10a is formed. While opening 3
A finger insertion portion e, e is formed on two opposing sides of 3 so that the pit cover portion 10a can be easily removed.

In consideration of slip prevention, the pit cover 10 is made of a striped steel plate, and the pit cover portion 10a
On the other hand, a positioning means 32 is provided on a flat surface portion on the back surface of this.

The positioning means 32 moves the left and right caster wheels 28, 28, 29, 29 in a state in which the movable carriage 21 is aligned with the weight hanger 19 in a predetermined manner.
The pit cover portion 1 is formed so as to form a slight gap between the bearing members f (see FIGS. 6 and 7) and f outer surfaces.
Position regulating members 35, 35 are provided on the back surface of Oa, and guides 36, 36 for introducing the movable carriage 21 between the position regulating members 35, 35 are connected to the position regulating members 35, 35.

According to the above configuration, since the positioning means 32 is normally hidden in the pit P, the positioning means 3
2 does not hinder the running or walking of the test vehicle.

At the time of load cell calibration, the pit cover portion 1 is positioned so that the positioning means 32 appears.
The movable cart 21 is pushed in between the position regulating members 35, 35 along the guides 36, 36 by inverting the front and back of the movable cart 21a. By simply adjusting the position of the moving carriage 21 in the front-rear direction on the flat surface, the plurality of weights W of the movable carriage 21 can be transferred to the weight hanger 1 on the calibration arm 18 side.
9 can be aligned as predetermined.

Preferably, as shown by an imaginary line in FIG. 9, a wheel stopper for the front caster wheels 28, 28, that is, a position regulating member 37 for introducing the movable carriage 21 is provided. In this configuration, it is not necessary to adjust the position of the mobile trolley 21 in the front-rear direction, that is, the mobile trolley 21 is simply placed between the position restricting members 35, 35 so that the movable trolley 21 is brought into contact with the introduction position restricting member 37. Just by pushing, the mobile trolley 21 can be aligned as predetermined.

[0043]

As described above, according to the present invention, the work of mounting the bracket and the calibration arm can be performed in a large floor space, and the work of replacing the weight on the hanger at the end of the calibration arm can be performed. By simply raising and lowering the weight of the mobile trolley, it can be performed without any need to carry the weight by hand, greatly improving the workability of load cell calibration, and also making it possible to easily perform fine positioning of the mobile trolley. Therefore, usability is also improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an overall configuration showing an embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing a setting state of a calibration arm in the embodiment.

FIG. 3 is a plan view of the same embodiment.

FIG. 4 is an explanatory view for attaching a calibration arm.

FIG. 5 is an explanatory diagram showing a state in which a weight is placed on a weight hanger at the end of a calibration arm.

FIG. 6 is a side view of the movable cart.

FIG. 7 is a front view of the movable cart.

FIG. 8A is an explanatory view showing a state before the weight is placed on the weight hanger, and FIG. 8B is an explanatory view showing the weight being placed on the weight hanger;

FIG. 9 is an explanatory diagram showing a state in which the pit cover portion provided with the positioning means is turned upside down.

[Explanation of symbols]

1: Dynamo body, 5: Roller, 7: Load cell, 10
Pit cover, 10a pit cover portion, 11 opening, 12 bracket mounting portion, 15 opening, 17 bracket, 18 calibration arm, 19 weight hanger, 21 moving carriage, 32 positioning means, 35 ... Position regulating member, 36 ... Introduction guide, 37 ... Introduction position regulating member, P ... Pit, W ... Weight.

Claims (3)

[Claims] 1. A part of a peripheral surface of a roller connected to a dynamo body in a pit is exposed to an opening formed in a pit cover, and a driving wheel of a test vehicle is mounted on an exposed peripheral surface of the roller. Then, in a chassis dynamometer that drives the drive wheels with an engine mounted on a test vehicle to rotate the rollers, a load cell for measuring the torque of the rollers is provided on the dynamo main body, and the pit is provided above the dynamo main body. A bracket installation part is continuously provided in a state where the bracket is installed in the pit cover, and an opening facing the bracket installation part is formed in the pit cover. Through the bracket mounting portion so as to be removable, and
Weight hangers are provided at both ends of the calibration arm, which reversibly receive weights provided for the movable trolley so as to be able to ascend and descend, one by one, while positioning the movable trolley with respect to the hanger at a weight replacement portion of the pit cover. Means, and a pit cover portion including the positioning means is configured to be capable of being turned upside down. 2. The chassis dynamometer according to claim 1, wherein said positioning means includes a position restricting member for moving the carriage in the left-right direction and a guide for introducing the movable carriage between the position restricting members. 3. The positioning device according to claim 1, wherein the positioning means comprises a position regulating member for moving the carriage in the left-right direction, a guide for introducing the carriage between the position regulating members, and a member for regulating the introduction position of the carriage. The described chassis dynamometer.