JPH0351732Y2 - - Google Patents

Description

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

B. Summary of Disclosure Since the hook is vertically slidable relative to the fixed member via a linear ball bearing, the hook can be set at the same height as the fixed position on the vehicle without any special operation, and The traction force is attenuated by the shock absorbing means provided on the hook, so that the cable does not break.

C. Prior Art The power performance test of a vehicle is usually 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 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.

D. Problems to be solved by the invention This invention has been developed in view of the above-mentioned circumstances.The fixing height can be automatically adjusted, and the excessive tension applied to the chain due to the action of the lifting device in the event of a tire puncture can be avoided. By providing fixing fittings that can absorb moisture, even when applied to a wide variety of vehicles, unnecessary pressing force is not applied to the rollers of the chassis dynamometer, increasing the reliability of test results and further pushing up the vehicle body. The purpose of the present invention is to prevent the chain from breaking even if a traction force greater than the chain breaking load is sometimes applied between the vehicle body and the fixing metal fittings.

E. Means and Actions for Solving the Problems In order to achieve the above object, the present invention provides a vehicle in which the driving wheels are mounted on rollers connected to a chassis dynamometer, and a hook connected to the vehicle through a cable. A shock absorbing means is provided so that when a traction force greater than the breaking load acts on the cable, the shock absorbing means is activated to prevent the cable from breaking.

F Embodiment Figure 2 shows a state in which a four-wheel drive vehicle is fixed using the fixing bracket according to the present invention. The fractured side view is shown.

A wire ball 2 is fitted into an embedded pipe 1 embedded in the floor, and a cylindrical moving fitting 3 is fitted into the wire ball 2 via a linear ball bearing 4 so as to be slidable in the vertical direction. . A retaining fitting 2b and an eye bolt 2c are fixed to the upper end of the wire pole 2, and a movable fitting 3 is fixed to the upper end of the wire pole 2.
There is a cylindrical spring pipe 5 at one place on the outer periphery of the
One end face of is attached. A rod 6 is provided in the cylindrical center of the spring pipe 5 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 5. Spring receiver 6a of rod 6 and spring pipe 5
A spring 7 is provided between the surface of the movable fitting 3 that is not attached to the movable fitting 3. Also, a spring pipe 5 is provided on the opposite side of the rod 6 from the spring receiver 6a.
A hook 8 is fixed to sandwich the end face of.

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 hook, the spring 7 is loosened 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. Furthermore, the hook 8 is vertically slidable via the linear pole bearing 4, and the hook 8 automatically moves up and down according to the height of the vehicle.

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. Since the hook 8 is vertically slidable on the wire pole 2 via the linear ball bearing 4, the height of the fixed position of the vehicle 02 and the height of the hook 8 of the fixing fitting 01 is always equal. 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. Further, an auxiliary chain 11 is stretched over the vehicle 02 and the fixture 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.

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 fitting 01, a force in the pulling direction acts on the hook 8, and the spring is pushed through the rod 6 and the spring receiver 6a. 7 is loosened 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

G. Effect of the invention As explained in detail based on the above embodiment, if the vehicle fixing bracket according to the present invention is used to fix a vehicle on a chassis dynamometer, the fixing position height of the fixing bracket can be adjusted without any operation. Since the angle of the cable with respect to the floor is small even when used to secure various types of vehicles, the excessive pressing force of the wheel against the roller of the chassis dynamometer is not applied, ensuring reliability. It becomes possible to conduct high power performance tests. Also, in the unlikely event that a tire goes flat during the test and the push-up device operates to push up the vehicle body, and a traction force greater than the cable breaking load is applied between the vehicle body and the fixing bracket, the shock The traction means is used to attenuate this traction force so that the cable does not break.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the fixing fitting according to the present invention, and Fig. 2 shows a state in which a four-wheel drive vehicle is fixed using the fixing fitting according to the present invention, a is a side view thereof, and b is a top view thereof. showed that. In the drawing, 1 is an embedded pipe, 2 is a wire pole,
3 is a moving bracket, 4 is a linear ball bearing, 5
is a spring pipe, 6 is a rod, 7 is a spring, 8 is a hook, 9 is a manual winch, 10, 11
is a chain.

Claims (1)

[Scope of utility model registration request] The drive wheel is mounted on a roller connected to a chassis dynamometer. A hook connected to the vehicle via a cable is attached vertically via a linear ball bearing to a fixed member fixed to the outer floor of the vehicle. 1. A vehicle fixing metal fitting, which is provided so as to be slidable in a direction, 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.