JP4209269B2 - Chassis dynamometer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chassis dynamometer including rollers for simulating a road surface with respect to vehicle driving wheels, which are used for measuring various characteristics of a vehicle.
[0002]
[Prior art]
FIG. 3 shows a typical conventional configuration of a chassis dynamometer including a roller that simulates a road surface with respect to vehicle driving wheels.
In the figure, a is a front view of the chassis dynamometer, b is a right side view of the chassis dynamometer, and c is a top view of the chassis dynamometer. Further, d in the figure is a diagram schematically showing the bearing structure of the chassis dynamometer. However, the right side view of b in the figure shows a form seen through a roller (shown by a wavy line) to be described later.
[0003]
As shown in the figure, in this configuration, a frame 10 7 is swingably supported by a bearing column 102 fixed to the base 101 via a bearing 103, and is supported by a frame 107 of a dynamometer 106 via a bearing 108. The shaft 104 is rotatably supported. The rollers 105 are coupled to the left and right ends of the shaft 104 so as to rotate together with the shaft 104. Further, the shaft 104 is fixed to the rotor 109 in the dynamometer 106, and the rotor 109 interacts with the stator 110 fixed to the frame 107 so as to form a gap between the rotor 109 and the frame 107. Get torque against.
[0004]
The rotor 109, the shaft 104, and the roller 105 are rotated with respect to the system of the base 101 by the torque of the rotor 109 with respect to the frame 107, and the stator 110 and the frame 107 are rotated according to the torque applied to the roller 105 by the vehicle driving wheels. It swings with respect to the base 101 system. Therefore, the load acting on the arm 111 fixed to the frame 107 is measured by the load meter 112, whereby the torque acting between the roller 105 and the vehicle driving wheel can be measured.
[0005]
In addition, as a document regarding such a dynamometer, there is JP-A No. 09-257656.
Prior art document information relating to the invention of this application includes the following.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 09-257656 [0007]
[Problems to be solved by the invention]
According to the chassis dynamometer, since a heavy object such as a roller or a dynamometer needs to be swung for measurement, a relatively large and strong structure is required.
There is also a problem that the torque acting on each of the two rollers cannot be measured separately.
Accordingly, an object of the present invention is to provide a chassis dynamometer that does not require rocking of the dynamometer for measurement.
Another object of the present invention is to provide a chassis dynamometer capable of measuring torque acting on each roller when rollers are provided on both sides of the dynamometer.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a chassis dynamometer comprising a roller for mounting a vehicle drive wheel, a shaft connected to the roller, and a dynamometer for rotationally driving the shaft. A bearing interposed therebetween, a connecting member for connecting the shaft and the roller, and a strain sensor fixed to the connecting member are provided.
[0009]
According to such a chassis dynamometer, even if the dynamometer is fixed without swinging, the distortion generated in the connecting member according to the torque applied to the roller by the vehicle driving wheel is measured by the strain sensor. The torque acting between the roller and the vehicle drive wheel can be calculated. In addition, a structure with a bearing that supports the weight of the roller and a structure with a connecting member for measuring the torque applied to the roller and a strain sensor are provided independently, so that the bearing does not give the connecting member so much strength. Thus, the roller can be stably supported with sufficient strength.
[0010]
Here, in such a chassis dynamometer, the connecting member may be configured to connect an end surface of the shaft opposite to the dynamometer and an end surface of the roller opposite to the dynamometer. It is desirable from the viewpoint of simplification of structure and ease of maintenance.
[0011]
Further, when such a chassis dynamometer is configured as a chassis dynamometer for a four-wheeled vehicle including the two rollers respectively connected to both end sides of the shaft, One of the connecting members and the strain sensor fixed to each of the connecting members are provided.
[0012]
By doing in this way, the torque which acted between two rollers and a vehicle drive wheel can be calculated independently for each roller.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the configuration of the chassis dynamometer according to this embodiment.
In the figure, a is a front view of the chassis dynamometer, b is a right side view of the chassis dynamometer, and c is a top view of the chassis dynamometer. Moreover, d in the figure is a diagram schematically showing a cross section of the chassis dynamometer along the cross sectional line AA in FIG.
[0014]
As shown in the figure, a support 2 is fixed to the base 1, and a dynamometer 3 is fixed on the support 2. The shaft 6 is rotatably supported by the frame 4 of the dynamometer 3 via the first bearing 5. Further, rollers 8 are supported on both ends of the shaft 6 via second bearings 7 respectively. The bottom surface of the outer side of the shaft 6 and the bottom surface of the outer side of the roller 8 are connected by a flange-type strain sensor 9 by a bolt 91 so that the roller 8 rotates together with the shaft 6.
[0015]
In addition, the shaft 6 is fixed to the rotor 10 inside the dynamometer 3, and the rotor 10 interacts with the stator 11 fixed to the frame 4 so as to form a gap between the rotor 10 and the frame 10. Torque for 4 is obtained. The rotor 10, the shaft 6, the roller 8, and the flange type strain sensor 9 are rotated with respect to the dynamometer 3 by the torque of the rotor 10 with respect to the frame 4.
[0016]
Here, when the flange-type strain sensor 9 is removed, the shaft 6 is configured to rotatably support the roller 8 by the second bearing 7. That is, a force for supporting the weight of the roller 8 is not applied to the flange type strain sensor 9.
[0017]
The flange-type strain sensor 9 has a flange 92 and one or more strain sensors 93 fixed to the flange 92, and the flange 92 is fastened to the shaft 6 and the roller 8 with bolts 91. Bolt holes are provided. The strain sensor 93 outputs a value corresponding to the strain generated in the flange type strain sensor 9, and the output of the strain sensor 93 is input to the torque calculation device 12.
[0018]
Therefore, the distortion generated in each part of the two flanges 92 according to the torque applied to the roller 8 by the vehicle driving wheel is measured by the strain sensor 93, and the measured distortion amount is determined in advance by the torque calculation device 12. By processing in accordance with the conversion formula, the torque acting between each of the left and right rollers 8 and the vehicle drive wheels can be calculated.
[0019]
The embodiment of the present invention has been described above.
As described above, according to the present embodiment, it is possible to calculate the torque applied to the roller 8 by the vehicle drive wheels without swinging the dynamometer 3. In addition, the torque acting between the left and right rollers 8 and the vehicle drive wheels can be calculated independently. Moreover, since the structure by the 2nd bearing 7 which supports the weight of the roller 8 and the structure by the flange type strain sensor 9 for measuring the torque added to the roller 8 are provided independently, the flange type strain sensor 9 has a certain amount. Without giving strength, the second bearing 7 can stably support the roller 8 with sufficient strength.
[0020]
By the way, in the above embodiment, the flange type strain sensor 9 is provided so as to connect the bottom surface of the end of the shaft 6 and the bottom surface of the outer side of the roller 8, but this flange type strain sensor 9 is formed in an annular shape. As shown to 2a, it can also provide so that the side surface of the shaft 6 and the inner bottom face of the roller 8 may be connected. Alternatively, as shown in FIG. 2 b, instead of the flange-type strain sensor 9, a connecting member 21 that connects between the side surface of the shaft 6 and the side surface of the roller 8 on the shaft 6 side, and a strain sensor fixed to the connecting member 21. 22 may be provided.
[0021]
Further, although the present embodiment has been described by taking an example of application to a chassis dynamometer including two rollers 8 for a four-wheeled vehicle including two vehicle driving wheels, The present invention can be similarly applied to a chassis dynamometer for two-wheeled vehicles having only one.
Further, it can be similarly applied to a four-wheeled vehicle (4WD) having four driving wheels by installing two chassis dynamometers having two rollers 8 for front wheels and rear wheels. . In this case, it is preferable that the distance between the two chassis dynamometers can be adjusted according to the wheel base of the vehicle by providing one chassis dynamometer so as to be movable in the longitudinal direction of the vehicle.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a chassis dynamometer that does not need to swing the dynamometer for measurement.
Moreover, this invention can provide the chassis dynamometer which can each measure the torque which acts on each roller, when a roller is provided in the both sides of a dynamometer.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a chassis dynamometer according to an embodiment of the present invention.
FIG. 2 is a diagram showing another configuration example of the chassis dynamometer according to the embodiment of the present invention.
FIG. 3 is a diagram showing a configuration of a conventional chassis dynamometer.
[Explanation of symbols]
1: base, 2: support base, 3: dynamometer, 4: frame, 5: first bearing, 6: shaft, 7: second bearing, 8: roller, 9: flange-type strain sensor, 10: rotor, 11 : Stator, 12: Torque calculation device, 91: Bolt, 92: Flange, 93: Strain sensor, 94: Bolt hole.

Claims (3)

A chassis dynamometer comprising a roller for mounting a vehicle driving wheel, a shaft connected to the roller, and a dynamometer for rotationally driving the shaft,
A bearing interposed between the roller and the shaft;
A connecting member for connecting the shaft and the roller;
A chassis dynamometer comprising a strain sensor fixed to the connecting member. The chassis dynamometer according to claim 1,
The connecting member connects the end surface of the shaft opposite to the dynamometer and the end surface of the roller opposite to the dynamometer. The chassis dynamometer according to claim 1 or 2,
Two rollers respectively connected to both ends of the shaft;
A chassis dynamometer, comprising: the two connecting members provided for each of the two rollers, and the strain sensors respectively fixed to the connecting members.

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