JPH044194Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> The invention is a palm dynamometer (hereinafter referred to as
This product relates to a vehicle restraint device that allows vertical and horizontal movement of a vehicle (abbreviated as CHDY) and restrains it in the front and rear directions.

<Conventional technology> CHDY is widely used for testing exhaust gas characteristics and fuel consumption characteristics because it allows experiments equivalent to actual driving on the road to be easily conducted indoors with good reproducibility. Recently, it has also been used for research and experiments on maneuverability and stability during high-speed driving.
However, there are many test items including the setting of absorption power, and if even one of these is inappropriate,
CHDY simulation becomes unsatisfactory. Therefore, in order to improve reproducibility, four
CHDY has been developed not only for wheel drive vehicles but also for front wheel drive or rear wheel drive vehicles, in which all four wheels are placed on a load device and rotated. Conventionally, a wire rope 7 as shown in FIGS. 1 and 2 has been used to restrain a vehicle on such a CHDY in the longitudinal direction. That is, as shown in the figure, two sets of front and rear rollers 1 and 2 are rotatably supported via bearings under the floor surface.
An absorption device (both not shown) is connected to the speed increaser and a flywheel to form a load device. Front and rear wheels 6 of a vehicle 5 are placed on the upper surfaces of the rollers 1 and 2 exposed on the floor surface, and when the vehicle 6 is driven and rotated, the rollers 1 and 2 rotate accordingly. A plurality of wire ropes 7 are stretched across the floor from the front and rear ends of the vehicle 5, and the vehicle 5 is positioned and fixed in the longitudinal direction. Further, the wire ropes 7 that are stretched across the vehicle 5 are crossed in the left and right directions so that the vehicle 5 does not move not only in the front and rear directions but also in the left and right directions.

<Problems to be solved by the invention> Although such a fixing method using the wire rope 7 is easy to handle, it has the following drawbacks.

(b) During acceleration and deceleration, a propulsive force is generated and the vehicle body tries to move back and forth, so the wire rope 7 expands and contracts and causes waves, and as a result of the vehicle body vibrating back and forth, the wire rope 7 as shown in Figure 2. Since it is pulling the vehicle body downward, the vertical component of the pulling force makes it appear as if the weight of the vehicle has increased, which causes an error in the measured value of power absorption, making it impossible to accurately measure power.

(b) If the vehicle body vibrates or loads are applied due to the above reasons, there will be problems such as deformation of the suspension and tires.

The present invention provides a vehicle restraint system that eliminates the drawbacks of the prior art by fixing the wheel hubs of the wheels instead of fixing the vehicle body with a wire rope, thereby freeing the vehicle's movement and allowing accurate simulation of CHDY. The purpose is to

<Means for Solving the Problems> The present invention includes a mounting shaft having a flange fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer, and a mounting shaft that is rotatable and a rotary rocking device that supports the rotary rocking device so as to be swingable in any direction; a link mechanism that supports the rotary rocking device so as to be movable in the front and rear directions and movable in the left-right and up-down directions; and the link mechanism and the chassis dynamo. The meter is characterized by comprising a slider on which the meter load device is placed so that its position can be adjusted in the longitudinal direction of the vehicle.

<Function> The link mechanism allows the rotation and oscillation device to move vertically and horizontally, but restricts its movement in the front and rear directions, and the rotation and oscillation device also allows the rotation and oscillation device to rotate the mounting shaft and move in any direction. Allow for rocking. Furthermore, the mounting shaft has a flange that is fixed to the wheel hub of the wheel.

Therefore, when a vehicle mounted on a load device of a chassis dynamometer is fixed to the mounting shaft with the wheel hub of the wheel, the movement in the longitudinal direction is restricted.
Movements such as wheel rotation, vertical movement, turning motion, and pitching and rolling of the vehicle body behave in the same way as when actually driving on the road.

Further, a load device is mounted on the slider, and the position of this load device can be adjusted in the front-rear direction in accordance with the wheel base of the vehicle.

Therefore, if a link mechanism is installed on this slider, by moving the slider back and forth,
The position of not only the load device but also the vehicle restraint device is adjusted at the same time in accordance with the wheelbase of the vehicle.

<Example> The present invention will be described in detail below based on embodiments.

An embodiment of the present invention is shown in FIGS. 3 to 7. As shown in FIGS. 3 and 4, below the pit cover 10, which is the floor surface, there are rollers 11a in the front, back, left and right.
11b, 12a, 12b are each arranged rotatably, and the front rollers 12a, 12b are immovable in the front-rear direction, whereas the rear roller 11
a and 11b are slidably mounted on the slide rail 9 so as to be movable in the front and rear directions.
That is, a slider 8 supporting the rear rolls 11a and 11b is placed on a slide rail 9 so as to be slidable back and forth, and a screw shaft 13 that passes through the slider 8 and is screwed into the slider 8 is rotatably supported. 14
is connected to. Therefore, when the screw shaft 13 is rotated by the motor 14, the slider 8 and the rollers 11a, 11b which are screwed thereon are screwed back and forth, and the positions of the rollers 11a, 11b in the front and back direction can be adjusted. An absorption device (all not shown) is connected to the rollers 11a, 11b, 12a, and 12b via a speed increaser and a flywheel to constitute a load device, and the roller 11 exposed from the pit cover 10
Wheels 6 and 16 of a four-wheel drive vehicle 15 are placed on the upper surfaces of wheels a, 11b, 12a and 12b. Therefore, when the wheels 6, 16 are driven to rotate, the rollers 11a, 11b, 12a, 12b are rotated accordingly, but the CHDY to which the present invention can be applied is not limited to this. For example, in the case of CHDY, which tests rear-wheel drive vehicles, a load device is used in which the front and rear rollers 11a, 11b, 12a, 12b are rotated synchronously using equal speed gears, etc., so that they share a flywheel. Also good,
Further, instead of the rollers 11a, 11b, 12a, 12b, a steel belt or the like may be rotatably stretched, and the load device may be configured such that the wheels 6, 16 can be mounted on the steel belt or the like.

As shown in FIGS. 3 and 4, the vehicle restraint device 42 of the present invention is designed to restrain the rear wheels 16 of a four-wheel drive vehicle 15 by attaching the frame 17 to the slider 8 on both left and right sides of the rear wheels 16. It is supported by
That is, the vehicle restraint device 42 is comprised of a link mechanism 66, a rotational swing device 41, a mounting shaft 52, etc., as shown in FIGS. 5 to 7. The base 43 is installed on the frame 17 and rotatably supports the left and right links 39 via bearings 44 around an axis horizontal to the longitudinal direction of the vehicle. The left and right links 39 are the fourth
As shown in the figure, the base 43 is constructed into a rectangular frame consisting of a vertical frame 39a, a lower frame 39c and an upper frame 39d, and is rotatable around the lower frame 39c.
A reinforcing member 39b is attached between diagonal corners thereof to increase rigidity in the front and rear direction.
As shown in FIG. 6, the vertical link 40 is framed in an isosceles triangle, and is connected to the upper frame 39d of the left and right link 39 by bearings 40a and 40b provided on both sides of its base, and extends in the longitudinal direction of the vehicle. It is designed to be able to rotate around a horizontal axis. As a result of the left and right links 39 and the up and down links 40 being rotatably connected around an axis horizontal to the longitudinal direction of the vehicle, the link mechanism 66 allows the rotational swing device 41 to be moved in the longitudinal direction of the vehicle while being unable to move from side to side. It can be supported movably in both the vertical and vertical directions.

The rotating swing device 41 has a flange 52a fixed to a wheel hub 56 of a wheel as shown in FIG.
A mounting shaft 52 having a diameter is supported by a self-aligning ball bearing 53, a swing shaft 54, etc. so as to be rotatable and swingable in any direction. That is, the wheel hub 5
6, a flange portion 52a formed at the left end of the brake drum 57, wheel 58, and mounting shaft 52 in the figure.
are fastened together with hub bolts 58 and nuts 59. A self-aligning ball bearing 53 is fitted onto the outer periphery of the mounting shaft 52, and this self-aligning ball bearing 5
3 is the front and rear direction (in the figure, it is the vertical direction)
It is held between the swing shaft 54 and the swing shaft 54. Each swing shaft 54 is connected to the vertical link 40 via a ball bearing 55.
It is rotatably supported around an axis horizontal to the front and rear directions of the vehicle. As a result, the wheels 16 are not restrained at all except for their movement in the front-rear direction, and can freely rotate and swing in any direction.

Furthermore, the tire air pressure can be measured through the rotation and rocking device 41, or the tire air pressure can be changed depending on the purpose of the test. That is, the mounting shaft 52 has a ventilation hole 60 for air pressure control that passes from the rear end surface through its center to the upper side surface in the figure.
is bored and the rear part of the mounting shaft 52 is attached to the cover 6.
Covered by 1. A rotary joint 62 is airtightly interposed between the cover 61 and the rear end of the mounting shaft 52, and a ventilation pipe 63 connected to a compressed air source and a pressure measuring device (both not shown) is connected to the end of the cover 61. is connected to. On the other hand, the ventilation hole 60
There is a tire tube in the side opening (not shown).
A ventilation pipe 64 is connected thereto. Therefore,
The pressure measurement device communicates with the tube of the tire through the ventilation pipe 63, the ventilation hole 60, and the ventilation pipe 64, and can measure the tire air pressure even while the wheel 16 is rotating. It is also possible to control tire air pressure by supplying compressed air from a compressed air source to the tire tube through the vent hole 60 or the like, and to measure how the tire air pressure affects fuel efficiency. In this case, rotary joint 6
2 is interposed between the cover 61 and the mounting shaft 5.
No air leaks between the two. In the figure, 65 is a two-pole slip ring for tire temperature measurement.

In this embodiment having the above configuration, the wheels 16
When performing various tests by driving and rotating the rollers 11a to 12b, the vehicle 15 is suddenly accelerated,
Even if rolling or pitching occurs due to sudden deceleration or one-sided braking, the link mechanism 66 and rotational swing device 41 operate, and the vehicle is not restrained in the front-rear direction, but is similar to actual road driving. They behave similarly.

Furthermore, when the slider 8 and the rollers 11a, 11b are moved back and forth by the motor 14 and screw shaft 13, the vehicle restraint device 42 of the present invention is also moved back and forth at the same time, so even if the wheelbases of the vehicles 15 are different. , the position of the device 42 of the present invention can be adjusted back and forth accordingly. Moreover, since the rotary swing device 41 can be moved up and down by the link mechanism 66, it is also excellent in versatility, such as being able to handle wheels with different diameters. In the above embodiment, the self-aligning ball bearing 53 is used, but the present invention is not limited to this, and instead of the self-aligning ball bearing 53, a ball bearing, a spherical bearing, etc. may be used. . Further, in the above embodiment, the slider 8 is moved back and forth by the motor 14 and the screw shaft 13, but the drive mode of the slider 8 is not limited to these, for example, by using gears, hydraulic pressure, etc. It's good that it's something.

<Effects of the Invention> As specifically explained above based on the embodiments, in the present invention, the vehicle restraint device is mounted on the slider on which the load device of the chassis dynamometer is placed so that its position can be adjusted in the longitudinal direction of the vehicle. When installed, the vehicle restraint device includes a mounting shaft having a flange portion fixed to the wheel hub of a wheel mounted on a load device, and a support for the mounting shaft so as to be rotatable and swingable in any direction. It consists of a rotary rocking device that supports the rotary rocking device, and a link mechanism that supports the rotary rocking device so that it cannot be moved in the front-back direction but is movable in the rocky direction and the vertical direction, so rolling and pitching of the vehicle is allowed on CHDY. This makes it possible to perform tests that are almost the same as actual road driving with good reproducibility. Another advantage is that it can be easily applied to vehicles with different wheelbases.

[Brief explanation of the drawing]

Figure 1 is a plan view for explaining the conventional vehicle body fixing method, Figure 2 is its schematic structural diagram, and Figures 3 to 7.
The figures relate to one embodiment of the present invention. Figures 3 and 4 are a plan view and side sectional view of CHDY in which the vehicle restraint system of the present invention is installed, and Figures 5 and 6 show the vehicle restraint system installed. A side view, a plan view, and a partially sectional view, and FIG. 7 are enlarged sectional views of the attachment mechanism. In the drawing, 8 is a slider, 9 is a rail, 11a,
11b, 12a, 12b are rollers, 13 is a screw shaft, 14 is a motor, 15 is a four-wheel drive vehicle, 16 is a wheel, 39 is a left and right link, 40 is an up and down link, 41
42 is a rotational swing device, 42 is a wheel restraint device, 52 is a mounting shaft, 52a is a flange portion, 56 is a wheel hub, and 58 is a wheel.

Claims (1)

[Scope of utility model registration request] a mounting shaft having a flange that is fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer; and a rotating swing device that supports the mounting shaft so as to be rotatable and swingable in any direction. , a link mechanism that supports the rotary rocking device so as to be immovable in the longitudinal direction and movable in the horizontal and vertical directions, and a load device for the link mechanism and the chassis dynamometer that is mounted so as to be adjustable in position in the longitudinal direction of the vehicle. A vehicle restraint device comprising: a slider for positioning the vehicle.