JPH056515Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a chassis dynamometer for vehicle testing that drives and rotates the front and rear wheels of a vehicle.

B. Summary of the invention The present invention mounts at least one of the first and second rollers, on which the front and rear wheels of a vehicle are placed, on a movable base to make the distance between the axes of the two rollers variable, and to change the rotation axis of the two rollers. In a chassis dynamometer connected by a connecting shaft via a bevel gear mechanism, by supporting the flywheel on a fixed floor and connecting it to the connecting shaft, the movable platform can be made smaller and lighter, and the flywheel This is intended to stabilize support for the government.

C. Conventional technology Chassis dynamometers can create conditions indoors that are close to the actual driving conditions of a vehicle and can easily perform various tests. It is widely used for tests, etc.

When performing such various tests, it is necessary to manage various set values, and if this management is inappropriate, accurate measurements cannot be performed.
Among these control items is the vehicle weight setting, which is usually achieved by connecting a flywheel with an appropriate moment of inertia to the rollers on which the front and rear wheels of the vehicle are mounted, and applying a load to the rollers. It will be done.

Here, the configuration of a conventional chassis dynamometer will be explained based on FIGS. 3 and 4.
The chassis dynamometer 1 includes first and second rollers 2, 3 on which the front and rear wheels of a vehicle are mounted, and a dynamometer 5 connected to each rotating shaft 4 of the first and second rollers 2, 3, each rotating. A flywheel 6 connected to one end of the shaft 4, a bevel gear mechanism 7 attached to the other end of each rotating shaft 4, and a connecting shaft 8 disposed in a direction perpendicular to the rotating shaft 4 that connects both bevel gear mechanisms 7. It consists of The roller 3 on the rear wheel side and the dynamometer 5, flywheel 6, and bevel gear mechanism 7 connected thereto are installed on a movable base 10 guided by a plurality of parallel rails 9. It is movable in the axial direction of the connecting shaft 8, that is, in the direction of moving the rollers 2 and 3 toward and away from each other.

Reference numeral 11 is a drive motor for the movable base 10, and the movable base 1 is driven by the drive motor 11.
By adjusting the 0 position, the distance between the axes of the first and second rollers 2 and 3 can be adjusted in accordance with the wheel base of the vehicle under test.

Note that 12 is an engine cooling fan.

D Problems to be Solved by the Invention In this way, in the past, the movable base 10 was equipped with the roller 3, dynamometer 5, bevel gear mechanism 7, and flywheel 6, so the movable base 10 itself became large, and A moving space is required for the movement of the movable platform 10, which increases the size of the entire equipment.In addition, a drive motor with a large driving force must be used to move the movable platform 10 equipped with a heavy flywheel. However, it had become an expensive piece of equipment.

Furthermore, installing the flywheel on a movable base causes vibrations of the flywheel during high-speed vehicle running tests, which may impede accurate measurement.

On the other hand, recently, electrical inertia compensators have been considered in place of mechanical flywheels for setting vehicle weight. This calculates the torque generated by the flywheel by electrically detecting and calculating the acceleration/deceleration of the roller, and automatically loads this torque to the dynamometer according to the acceleration/deceleration. It has the same effect as a wheel. This has advantages such as smaller size and lower cost of the entire equipment compared to a mechanical flywheel.

However, this electrical inertia compensation device detects the acceleration of the rollers, calculates the torque, and applies it as a load to the dynamometer, so it does not operate when the acceleration is 0 when the rollers start rotating, that is, when the vehicle starts. This results in a time delay and an error in the load torque. For this reason, an electromechanical combination type that directly connects the flywheel to the roller to compensate for this delay has been considered, but directly connecting the flywheel to the roller requires a large and heavy movable platform, similar to the mechanical type described above. It was not desirable in terms of equipment space and price.

The present invention solves these problems by creating a chassis dynamometer that allows easy adjustment of the roller position relative to the vehicle's wheel base, reduces equipment space, and allows accurate measurements. The purpose is to provide

E. Means for Solving the Problems The chassis dynamometer of the present invention for achieving the above-mentioned object has at least one of the first and second rollers on which the front and rear wheels of a vehicle are mounted mounted on a movable base. In a chassis dynamometer in which the distance between the axes of the rollers is variable and the rotation axes of both rollers are connected by a connecting shaft via a bevel gear mechanism, the flywheel is pivotally supported on a fixed floor surface and connected to the connecting shaft. It is connected.

F Effect Adjustment of the position of the roller according to the wheel base of the vehicle is performed by moving the movable base in the axial direction while the bevel gear mechanism is engaged with the connecting shaft. The movable platform is not equipped with a heavy flywheel, making it smaller and lighter.
On the other hand, since the flywheel is pivotally supported on a fixed floor surface, it is stably supported.

G. Example Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 show a chassis dynamometer according to an embodiment of the present invention; FIG. 1 is a plan view;
FIG. 2 is a sectional view of the bevel gear mechanism. In addition,
The same members as in the prior art are designated by the same reference numerals and redundant explanations will be omitted.

In the chassis dynamometer of the present invention, as shown in FIG. A dynamometer 5 is connected thereto, and a fixed bevel gear mechanism 25 is further connected thereto. On the other hand, the second roller 3 is pivotally supported by a movable base 24, and a dynamometer 5 and a movable bevel gear mechanism 26, which are also mounted on the movable base 24, are connected to the second rotating shaft 23. The bevel gear mechanisms 25 and 26 are connected to each rotating shaft 2.
A connecting shaft 27 arranged in a direction perpendicular to 1 and 23
connected by.

This movable table 24 is movable in the left-right direction in FIG. 1 along a rail 9 arranged in parallel on a fixed floor so that the distance between the axes of the first and second rollers 2 and 3 can be adjusted. ing. The two drive motors 28 are connected to the movable base 24 via a chain (not shown).
By connecting to a pinion gear (not shown) below the , and this pinion gear engaging with the rail 9,
The movable base 24 can be moved along the rail 9 by the driving force of the drive motor 28.

Both ends of a connecting shaft 27 connecting the fixed bevel gear mechanism 25 and the movable bevel gear mechanism 26 are further extended, and a flywheel 6 is connected to each end. This flywheel 6
are each pivoted on a fixed floor.

In Fig. 1, 29 is an electromagnetic clutch, 30 is a disc brake, 31 is a tire cooling fan, 1
2 is an engine cooling fan.

Next, the fixed bevel gear mechanism 25 and the movable bevel gear mechanism 26 will be explained based on FIG.

The connecting shaft 27 connects a through shaft 40 that passes through the fixed bevel gear mechanism 25 and a spline shaft 41 that engages with the movable bevel gear mechanism 26 to the connecting pin 4 .
2, they are connected so that they rotate together.

The main body 43 of the fixed bevel gear mechanism 25 rotatably supports a through shaft 40 and a spline shaft 41 connected by a connecting pin 42 on the inside thereof by bearings 44 and 45. A bevel gear 46 is fixed to the through shaft 40 inside the main body 43 by keying. On the other hand, a bearing 4 is attached to the main body 43 so as to be perpendicular to the through shaft 40 (connection shaft 27).
A bevel gear 49 is integrally fixed to the shaft end of the first rotating shaft 21 which is rotatably supported by 7 and 48, and this bevel gear 49 meshes with the bevel gear 46 of the through shaft 40. This bevel gear 49 has a larger diameter than the bevel gear 46, and therefore, the rotational force of the first rotating shaft 21 is transmitted to the penetrating shaft 40 through the bevel gears 46, 49.
In other words, the speed is increased and transmitted to the connecting shaft 27.

A spline shaft 41 serving as a connecting shaft 27 passing through a main body 51 of the movable bevel gear mechanism 26 has a spline formed on its outer peripheral surface that connects to a cylindrical output shaft 52.
The spline shaft 41 is connected to the output shaft 52 so that it can slide freely and rotate together with the output shaft 52 by engaging with a spline groove formed on the inner circumferential surface of a coupling member 53 that is integrally fixed to the left end in the figure. There is. Further, the output shaft 52 is supported by the main body 50 by bearings 54 and 55 so as to be rotatable and immovable in the axial direction, and a bevel gear 56 is fixed inside the main body 51 by key coupling. On the other hand, spline shaft 4
A bevel gear 59 is fixed to the shaft end of the second rotating shaft 23, which is rotatably supported by bearings 57 and 58 on the main body 43 so as to be perpendicular to the connecting shaft 27. Bevel gear 5 on shaft 52
It meshes with 6. This bevel gear 59 is the bevel gear 5
Therefore, the rotational force of the second support shaft is increased in speed and transmitted to the spline shaft 41 (connection shaft 27) via the bevel gears 56, 59 and the output shaft 52.

Next, the overall operation of the aforementioned chassis dynamometer 20 of the present invention will be described.

The vehicle under test is fixed on the chassis dynamometer 20, and the engine is started to drive the rear wheels or front wheels, or the front and rear wheels in the case of a 4WD vehicle. In the case of an FR vehicle, the rotation of the drive wheel is transmitted from the first roller 3 to the dynamometer 5 via the second rotating shaft 23, and drives the dynamometer 5, and is also transmitted from the movable bevel gear mechanism 26 to the connecting shaft 27. , is transmitted to the first rotating shaft 21 via the fixed bevel gear mechanism 25, causing the first roller 2 to rotate in the same manner as the second roller 3. The front and rear wheels of the vehicle under test are rotated at the same rate in this manner, even if the vehicle under test is a FF vehicle or a 4WD vehicle.

To match the wheelbase of the vehicle under test,
When adjusting the distance between the axes of the first roller 2 and the second roller 3, the drive motor 28 is driven to connect the dynamometer 5 and the movable bevel gear mechanism connected by the second roller 3 and the second rotating shaft 23. This is done by moving the movable base 24 supporting the slider 26 along the rail 9. At this time, in the movable bevel gear mechanism 26, since the output shaft 52 of the main body 51 is movable along the spline shaft 41, the movable bevel gear mechanism 26 has no relation to the flywheel 6 that is pivotally supported on the fixed floor surface.
It can move along the connecting shaft 27.

In this embodiment, each bevel gear mechanism 25, 26 has a speed increasing mechanism, and a bevel gear 46 disposed inside,
49, 56, and 59 each have a speed increasing ratio of 3/1. Therefore, the moment of inertia of each flywheel 6 is 9/1, and the rotating shafts 21, 2
3, the connecting shaft 27 has a higher rotation speed, and the flywheel can be made smaller and lighter than the conventional mechanical flywheel.

H. Effects of the invention As explained above in detail, according to the chassis dynamometer of the invention, the connecting shaft is connected to the rotating shaft of the second roller pivotally supported on the movable table via the bevel gear mechanism. Since the flywheel, which is pivoted on a fixed floor, is connected to the connecting shaft, the movable base can be made smaller and its weight can be reduced.The position of the roller relative to the vehicle's wheel base can be easily adjusted, and the movable base can be easily moved. The space is also reduced, and the entire equipment can be downsized. Furthermore, since the flywheel is supported on a fixed floor surface, vibration of the flywheel during high-speed vehicle running tests can be prevented and accurate measurements can be made.

[Brief explanation of the drawing]

1 and 2 show a chassis dynamometer according to an embodiment of the present invention; FIG. 1 is a plan view;
FIG. 2 is a sectional view of a bevel gear mechanism, and FIGS. 3 and 4 are a conventional chassis dynamometer, with FIG. 3 being a plan view and FIG. 4 being a side view. In the drawing, 2 is the first roller, 3 is the second roller, 5
is a dynamometer, 6 is a flywheel, 20 is a chassis dynamometer, 21 is a first rotating shaft, 22
2 is a support base, 23 is a second rotating shaft, 24 is a movable base, 2
5 is a fixed bevel gear mechanism, 26 is a movable bevel gear mechanism, and 27 is a connecting shaft.

Claims (1)

[Claims for Utility Model Registration] At least one of the first and second rollers on which the front and rear wheels of a vehicle are mounted is mounted on a movable base, the distance between the axes of the two rollers is variable, and the rotation axis of the two rollers is variable. A chassis dynamometer connected by a connecting shaft via a bevel gear mechanism, characterized in that a flywheel is pivotally supported on a fixed floor surface and connected to the connecting shaft.