JPH0436429Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an improvement of a roller for a chassis dynamometer used to test the running performance of completed vehicles such as automobiles and industrial vehicles.

B. Summary of the idea In a roller for a chassis dynamometer, which performs driving performance tests by placing the drive wheels of completed vehicles such as automobiles and industrial vehicles on the top of the roller installed on a fixed frame, the roller is floated via a bearing. By attaching the floating frame to a frame, suspending the floating frame using a plurality of load cells, and tethering it in the running direction of the vehicle, the driving force, braking force, wheel load, and their changes can be measured during the running performance test of the vehicle. This allows the state to be measured directly.

C. Conventional technology To directly measure the driving force and braking force of a completed vehicle, a mount is made for each vehicle and a wheel torque meter is attached to it, and a strain gauge is attached to the vehicle body support to measure the wheel load. was measuring.

D Problems that the invention aims to solve When measuring the driving force, braking force, wheel load, and changes in these of a completed vehicle by actually driving on an outdoor road, the road surface condition may be affected by weather, dust, etc. even if the road is the same. It is nearly impossible to repeatedly test under the same road surface conditions as the conditions are constantly changing.

When measuring by placing wheels on the rollers of a chassis dynamometer to reproduce actual driving conditions, it is possible to keep the road surface constant, but a mounting device must be manufactured for each vehicle to attach and detach the wheel torque meter. However, it also required a time-consuming task of attaching the strain gauge to the vehicle body support.

E. Means for Solving the Problems The rollers of the chassis dynamometer are attached to a floating frame via bearings, and the floating frame is suspended from a fixed frame by a plurality of load cells and is anchored in the running direction of the vehicle.

F Effect Wheel load is measured using a load cell in which a floating frame is suspended from a fixed frame, and driving force and braking force are measured by a load cell in which the floating frame is connected in the running direction of the vehicle.

G. Embodiment FIG. 1 is a diagram showing an example in which a chassis dynamometer employing a roller according to the present invention is installed under the floor, where 1 is a floorboard, 2 is an electric dynamometer, and 3
is a roller, 4 is a fixed frame, 5 is a vehicle,
6 is a speed increaser, and 7 is a flywheel. Although not shown, a vehicle speed proportional blower is provided on the floor plate 1 at the front of the vehicle 5 to send out air at a speed proportional to the traveling speed of the vehicle, and also directs cooling air toward the contact area between the wheels and rollers. A tire cooling fan that sprays air is installed.

2 to 4 show a partially cutaway front view, plan view, and side view of a roller for a chassis dynamometer, which is an embodiment of the present invention, and show the roller 3 and fixed frame 4 portions in FIG. 1. This is shown in more detail.

In FIGS. 2 to 4, 3 is a roller, 4 is a fixed frame, and 8 is a notch hole provided in the fixed frame 4 to expose the top of the roller 3 above the floor surface. 9 is a bearing that rotatably supports the roller 3; 10 is a floating frame to which the roller 3 is attached via the bearing 9; 11 is a load cell for suspending the floating frame 10 on the fixed frame 4; 12 is a mounting bracket for the load cell 11 on the fixed frame 4 side; and 13 is a mounting bracket for the load cell 11 on the floating frame 10 side. 14 is a load cell for anchoring the floating frame 10 to the fixed frame 4 in the traveling direction of the vehicle 5 in FIG. 1; 15 is a mounting plate fixed to the fixed frame 4; and 16 is the fixed frame 4 of the load cell 14. The side mounting bracket 17 is a mounting bracket on the floating frame 10 side of the load cell 14, and 18 is a mounting plate fixed to the floating frame 10. Reference numeral 19 denotes a constant velocity ball shaft joint, which is used to connect between the rollers 3 or between another shaft and the rollers 3.

A vehicle 5 is placed on top of the roller 3 configured as described above.
When driving or braking with the driving wheels of
The driving force or braking force is the roller 3, the bearing 9,
Since a tensile force or a compressive force is applied via the floating frame 10 to the load cell 14 that connects the floating frame 10 to the fixed frame 4, the driving force or braking force of the vehicle 5 is directly applied by the load cell 14. can be measured. Furthermore, changes in wheel load that occur when the vehicle 5 is driven or braked act as a tensile force on the load cell 11 that suspends the floating frame 10 on the fixed frame 4 through the rollers 3, bearings 9, and floating frame 10. As well, these changes can be directly measured by the load cell 11.

In the embodiment described above, since the rollers 3 are connected by a constant-velocity ball joint, the driving force, braking force, and wheel load of the left and right drive wheels of the vehicle 5 can be controlled individually. Changes can be measured, but
When using wide rollers that can accommodate the left and right drive wheels of the vehicle at the same time, or when installing two rollers 3 on a common floating frame, the front wheels of a front wheel drive vehicle or the rear wheel drive It is possible to directly measure the total driving force, braking force, wheel load, and changes in the rear wheels of a car.

In addition, the chassis dynamometer shown in Figure 1 is
When using a stand to place the front and rear wheels of the vehicle 5 on the rollers 3, directly measure the driving force, braking force, wheel load, and their changes when the front and rear wheels of a four-wheel drive vehicle are differentially connected, and the front and rear wheels are directly connected. Furthermore, by removing the constant velocity ball shaft joint between rollers 3 and 3 in Figure 2 and connecting a speed increaser, flywheel, and electric dynamometer to each roller, it is possible to drive a front-wheel drive vehicle or a rear-wheel drive vehicle. It is now possible to directly measure the driving force, braking force, wheel load, and changes in wheel load for each wheel when the left and right wheels are differentially set in a car.
To directly measure the driving force, braking force, and wheel load of each wheel and their changes when the front wheel differential, rear wheel differential, front and rear wheel differential, or a combination thereof or the differential parts of a wheel drive vehicle are directly connected. I can do it.

H. Effects of the invention This invention provides a roller for a chassis dynamometer.
It is attached to a floating frame via a bearing, and the floating frame is suspended from a fixed frame by a plurality of load cells, and
Because it is attached to the vehicle in the running direction, it can be used to attach and detach a wheel torque meter with a mount made for each test vehicle, estimate the effective radius of the wheel tire, calculate force from torque, or adjust the vehicle body support. The driving force and braking force of the vehicle are determined by a load cell that connects the floating frame to a fixed frame in the running direction of the vehicle, and the wheel load and wheel load are determined without the need for pasting strain gauges on the parts. The change is made by a load cell that suspends the floating frame on a fixed frame, and can be used for each wheel individually or for the left and right front and rear wheels collectively in front-wheel drive vehicles, rear-wheel drive vehicles, as well as in the case of 4-wheel drive vehicles. This has the practical effect of allowing direct measurement.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a chassis dynamometer employing a roller according to the present invention, and FIGS. 2 to 4 are a partially cutaway front view and a plan view showing an embodiment of the present invention, respectively. FIG. 3...Roller, 4...Fixed frame, 5...Vehicle, 9
...Bearing, 10...Floating frame, 11...Load cell for supporting the floating frame, 14...Load cell for anchoring the floating frame.

Claims (1)

[Scope of utility model registration request] In the roller of a chassis dynamometer, in which driving performance tests are carried out by placing the driving wheels of a vehicle on the top of a roller provided on a fixed frame, the roller is attached to a floating frame via a bearing, and the floating frame is connected to a plurality of load cells. A roller for a chassis dynamometer, characterized in that the roller is suspended from the fixed frame and is tethered in the traveling direction of the vehicle.