JPH025399Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a fixture for fixing a vehicle to be tested with a chassis dynamometer.

<Prior Art and Problems> Normally, vehicle power performance tests are conducted using a chassis dynamometer. A chassis dynamometer is a device that drives a vehicle by placing drive wheels on rollers, and puts a desired load on the rollers to make it run.
Vehicles are secured using a method that uses fixing devices installed on the floor and a chain stretched across the vehicle body.

With this method, the angle of the chain with respect to the floor surface becomes large, and the pressing force of the drive wheels against the rollers acts, which may result in unreliable test results.

On the other hand, the chassis dynamometer is equipped with a vehicle body lifting device in case the drive wheel tire becomes punctured during the test.At the same time as the tire goes flat, the vehicle body is pushed up by this device, and the tire wheel and rollers are lifted up. prevents contact with

However, if a tire goes flat during the test and the vehicle body is pushed up using the push-up device, the vehicle
Since the chain is fixed to the floor by stretching it, excessive tension is applied to the chain. If this tension exceeds the breaking load of the chain, there is a risk that the chain will break and the vehicle will fly forward.

<Purpose of the invention> The present invention was developed in view of the above-mentioned circumstances, and provides a fixing metal fitting whose fixing height can be adjusted and which can absorb the excessive tension applied to the chain due to the activation of the lifting device in the event of a tire puncture. However, even when applied to a wide variety of vehicles, the reliability of the test results is increased by preventing unnecessary pressing force from being applied to the rollers of the chassis dynamometer.Furthermore, when the vehicle body is pushed up, the The purpose is to prevent the chain from breaking even if a traction force greater than the chain breaking load acts between the chains.

<Summary of the invention> In order to achieve the above object, the invention provides a shock absorbing means in a hook connected via a cable to a vehicle on which a driving wheel is placed on a roller connected to a chassis dynamometer. When a traction force greater than the breaking load is applied to the cable, the shock absorbing means is activated to prevent the cable from breaking.

<Example> Fig. 1 shows a state in which a four-wheel drive vehicle is fixed using the fixing fitting according to the present invention, a is the side surface thereof, b is the top surface thereof, and Fig. 2 is a view of the fixing fitting according to the present invention. A partially broken side view is shown.

A wire pole 2 having a threaded portion 2a at its tip is fitted into the embedded pipe 1 to be buried in the floor, and the threaded portion 2a of the wire pole 2 has an eave-shaped protrusion 3b sandwiching the pillar portion 3a. , 3c are screwed together, and a movable metal fitting 2b with a hook attached thereto is fixed to the tip of the wire pole 2. A ring-shaped latch 4 having an inner diameter slightly larger than the outer diameter of the column 3a is attached to the column 3a between the protrusions 3b and 3c of the movable bracket 3, and is rotatable with respect to the movable bracket 3. It is attached so that it can be moved up and down. One end surface of a cylindrical spring pipe 5 is attached to one location on the outer periphery of the latch 4. This spring pipe 5
A rod 6 is provided at the center of the inner cylinder so as to be movable in the longitudinal direction of the spring pipe 5. The rod 6 has approximately the same length as the spring pipe 5, and a disk-shaped spring receiver 6a having an outer diameter slightly smaller than the inner diameter of the spring pipe 5 is attached to the bottom end of the spring pipe 5. Spring receiver 6a of rod 6 and spring pipe 5
A spring 7 is provided between the surface not attached to the latch fitting. A hook 8 is fixed to the opposite side of the rod 6 from the spring receiver 6a, sandwiching the end surface of the spring pipe 5.

In other words, the hook 8 is normally pressed against the wire pole 2 side by the spring force of the spring 7 via the rod 6 and the spring receiver 6a.
When a tensile force greater than the spring force of the spring 7 is applied to the spring 7, the spring 7 is compressed via the rod 6 and the spring receiver 6a, and the hook 8 is pulled and moved.

It should be noted that the spring 7 has an internal force greater than the maximum traction force when the vehicle is normally fixed, so the spring 7 does not contract during the test and the hook 8 remains in a fixed state.
In other words, the spring 7 does not act with the traction force during the test when the vehicle is normally fixed, but acts when the push-up device is activated and a traction force greater than the chain breaking load is generated between the vehicle and the fixing metal fittings. The spring constant of the spring 7 is set so that only a load less than the chain breaking load is applied to the chain.

When fixing the four-wheel drive vehicle 02 using the fixing fitting 01 having the above structure, it is done as follows.

First, on all sides of the vehicle 02, the drive wheels are placed on rollers 03 connected to the chassis dynamometer.
The embedded pipe 1 of the fixture 01 is embedded and fixed in the floor. By adjusting the moving bracket 3 screwed onto the wire pole 2, the fixed position of the vehicle 02 and the fixing bracket 01 are adjusted.
Make sure that the height of the hook 8 is as same as that of the hook 8. A chain 10 provided with a manual winch 9 is spanned between a vehicle 02 and a hook 8, and the chain 10 is stretched by the manual winch 9. Also vehicle 02
An auxiliary chain 11 is stretched over the fixing metal fitting 8 with a slight droop. Chains 10 and 11 are attached to each of the four locations on the vehicle 02 in the manner described above and fixed on the dynamometer. A power performance test is conducted while driving the vehicle 02 in this state.

During normal operation, the hook 8 is fixed in the pulling direction, and the latch 4 is rotatable and slightly movable up and down relative to the movable fitting 3, so vibrations are absorbed.

In the unlikely event that vehicle 02's tire went flat during the test,
When the lifting device operates and a traction force greater than the chain breaking load is applied between the vehicle 02 and the fixing metal fitting 01, a pulling force is applied to the hook 8 and the spring is released via the rod 6 and the spring receiver 6a. 7 is retracted and the hook 8 moves, and the chain 10 receives only a load less than the chain breaking load. Incidentally, the auxiliary chain 11 is provided for backup in case of an accident.

Although a spring is used as the impact mitigation means in the above embodiment, the present invention is not limited to this, and various dampers such as a hydraulic damper may be used. Further, although the height adjustment means was used by screwing the movable metal fitting onto the wire pole, it is possible to use various methods such as sliding the movable metal fitting onto the wire pole and bolting it at an arbitrary position.

Furthermore, although the above embodiment is used for fixing a four-wheel drive vehicle, it can also be used for fixing a two-wheel drive vehicle, and by appropriately selecting the number of fixing fittings and the fixing position, it can be used for fixing a two-wheel drive vehicle, a three-wheel drive vehicle, etc. It is also applicable to

<Effects of the invention> As explained in detail based on one embodiment above, if the vehicle fixing fitting according to the present invention is used to fix a vehicle on a chassis dynamometer, the fixing position height of the fixing fitting can be adjusted. As a result, even when used to secure various types of vehicles, the angle of the chain with respect to the floor surface will not become extremely large, and the excessive pressing force of the wheels against the rollers of the chassis dynamometer will not be applied, improving reliability. It becomes possible to conduct high power performance tests. In addition, even if a tire goes flat during a test and the push-up device is activated to push up the vehicle and a traction force greater than the chain breaking load is applied between the vehicle body and the fixing bracket, the fixing bracket is equipped with a shock absorbing mechanism. The means attenuate this traction force so that the chain does not break.

[Brief explanation of drawings]

Figure 1 shows a four-wheel drive vehicle fixed using the fixing fitting according to the present invention, a is a side view thereof, b
2 shows a top view thereof, and FIG. 2 shows a partially cutaway side view of the fixing fitting according to the present invention. In the drawing, 1 is an embedded pipe, 2 is a wire pole,
3 is a moving metal fitting, 4 is a latch metal fitting, 5 is a spring pipe, 6 is a rod, 7 is a spring, 8 is a hook, 9 is a manual winch, and 10 and 11 are chains.

Claims (1)

[Scope of utility model registration request] A hook connected to the vehicle via a cable is attached to a fixed member fixed to the outer floor surface of a vehicle in which the driving wheels are mounted on rollers connected to a chassis dynamometer, in the vertical direction of the fixed member. 1. A vehicle fixing fitting that is movably and rotatably provided, and the hook is provided with a shock absorbing means that is activated when the traction force applied to the cable exceeds a certain value.