JPH067355Y2 - Vehicle fixing device - Google Patents

Description

Detailed Description of the Invention A. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle fixing device for fixing a vehicle on which a power performance test is performed by a chassis dynamometer.

B. SUMMARY OF THE INVENTION The present invention relates to a vehicle fixing device for fixing a vehicle to be tested by a chassis dynamometer, and biases the vehicle and a fixing member fixed to a floor surface outside the vehicle toward each other. While connecting via a fluid pressure cylinder having a biasing member, the fluid pressure cylinder is provided with a bypass passage that connects two chambers partitioned by a piston, and a variable throttle valve is interposed in the bypass passage.
The vehicle is fixed so that it can move back and forth within a predetermined range with a restraining force according to the driving force of the vehicle, and its moving speed can be adjusted, so that a reliable power performance test can be performed in a state closer to the actual running state. It is something that can be done.

C. 2. Description of the Related Art Usually, a vehicle dynamic performance test is performed using a chassis dynamometer. In this chassis dynamometer, driving wheels are placed on the rollers to drive the vehicle, and an arbitrary load is applied to the rollers to create a running state to perform a performance test.In this case, the vehicle is fixed to the floor by a fixing device. Fixed.

An example of the conventional fixing device is shown in FIG. This is to fix a front wheel 1 which is an idle wheel of a vehicle by a fixture 2, and a rear wheel 3 which is a drive wheel is placed on a roller 4 to perform a performance test. It is especially used in tests for 2WD vehicles.

In addition to such a fixing device, as a device particularly used in a 4WD vehicle, as shown in FIGS. 6 (a) and 6 (b), between the fixing member 11 planted on the floor surface 10 and the vehicle 9. Chain 12
There is a fixing device for fixing the vehicle 9 by straddling it, and a front wheel 5 and a rear wheel 6, which are driving wheels, are placed on rollers 7 and 8 to perform a performance test.

D. It is desirable to perform a power performance test with a chassis dynamometer in a state closer to the actual running state of the vehicle, but with the conventional fixing device described above, the idle wheel of the vehicle that should be free during running is It is fixed so that the vehicle does not move back and forth by fixing or chaining it to the vehicle. Therefore, the force applied to the chain during the test causes an error in various measured values, and it is impossible to analyze the longitudinal behavior of the vehicle by the chassis dynamometer, such as a shock at the time of gear shifting due to sudden acceleration / deceleration of the vehicle. Further, there is a possibility that the chain that fixes the vehicle may break due to the front-back force that acts on the vehicle, and there is a risk that the vehicle may jump forward.

In order to solve such a problem, the present invention makes it possible to move the vehicle back and forth within a predetermined range with a restraining force according to the driving force of the vehicle, and fix the vehicle in a state close to the actual running state. An object is to provide a fixing device for a vehicle.

E. In order to achieve the above-mentioned object, in a vehicle fixing device of the present invention, a front part and a rear part of a vehicle, on which driving wheels are mounted on rollers connected to a chassis dynamometer, are provided outside the vehicle. While the vehicle and the fixing member are connected to a fixing member fixed to the floor surface via a fluid pressure cylinder having an urging member that urges the vehicle and the fixing member toward each other, the fluid pressure cylinder is partitioned by the piston. And a variable throttle valve is interposed in the bypass passage.

F. When a driving force in a certain direction is generated in the vehicle fixed by the action fixing device, the biasing member of the fluid pressure cylinder acts according to the driving force, and the vehicle until the driving force balances with the biasing force of the biasing member. Moving. On the other hand, along with this, the fluid flows in the bypass passage due to the movement of the piston in the cylinder, and the flow rate is adjusted by the variable throttle valve, so that the fluid pressure cylinder functions as a shock absorber.

G. Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2 are views showing a state in which a four-wheel drive vehicle is fixed using a vehicle fixing device according to an embodiment of the present invention. FIG. 1 is a side view and FIG. 2 is a plan view. FIG. 3 is a sectional view of a hydraulic cylinder used in a vehicle fixing device of the present invention,
FIG. 4 is a spring characteristic diagram of the compression spring of the hydraulic cylinder.

As shown in FIGS. 1 and 2, a vehicle fixing device includes a chain 25, one end of which is connected to a vehicle 24, a fixing member 30 that is planted on a floor surface 29, and one end of the fixing member 30. Hydraulic cylinder 28 as connected fluid pressure cylinder
And a chain 26 connected to the other end of the hydraulic cylinder 28.
And a chain block 27 connecting the chain 26 and the above-mentioned chain 25. And, the fixing device of this vehicle is the roller 20 of the chassis dynamometer,
The front and rear wheels 22, 23 are mounted on the vehicle 21, and are arranged so as to support two front and rear wheels, respectively, for a total of four positions.

As shown in FIG. 3, the hydraulic cylinder 28 includes a cylinder tube 31, a piston 32 slidably fitted on the inner peripheral surface of the cylinder tube 31, a piston rod 33 to which the piston 32 is fixed, and a cylinder. It consists of a compression spring 34 installed inside the tube 31.

The cylinder tube 31 has a cylindrical shape, and a rod cover 31a and a head cover 31b are fixed to both ends thereof to form a closed space. Ports 35, 3 communicating with the inside of the cylinder tube 31 are provided on the outer peripheral portions of the rod cover 31a and the head cover 31b, respectively.
6 are formed, and these ports 35, 36 are connected outside the cylinder tube 31 by a pipe 38 as a bypass passage with an Oin damper adjusting throttle valve 37 interposed. This oil damper adjusting throttle valve 37 is a cylinder tube 31.
The moving speed of the piston 32 is set by adjusting the flow rate of the oil filled in the pipe 38.

A protrusion 39 that protrudes outward is formed on the head cover 31b at one end of the cylinder tube 31.
Is connected to the other end of a chain 26, one end of which is connected to the vehicle 24.

The piston 32 is fitted to the inner peripheral surface of the cylinder tube 31 and is movable in the axial direction, and is fixed to a piston rod 33 penetrating the rod cover 31a and the head cover 31b of the cylinder tube 31 in the axial direction.
A piston ring 40 made of metal is fitted on the outer peripheral portion of the piston 32, whereby the sliding resistance of the piston 32 is reduced so that the piston 32 can move within the cylinder tube 31 with a small force.

The piston 32 located inside the cylinder tube 31 divides the inside of the cylinder tube 31 into two chambers A and B, and ports 35 and 36 communicate with the respective chambers A and B. Therefore, the piston 32 and the piston rod 33
Indicates the inside of the cylinder tube 31, for example, the arrow C shown in FIG.
When moving in the direction, the oil in the room B is pressurized, discharged from the port 36, and supplied into the room A through the pipe 38 and the throttle valve 37. Although the piston 32 is movable in the cylinder tube 31 as described above, the moving range of the piston 32 is set to the distance L shown in FIG. 3 by the stopper (not shown) in the cylinder tube.

A ring-shaped connecting portion 41 is fixed to one end of the piston rod 33 protruding outward, and the connecting portion 41 is connected to a fixing member 30 planted on the floor surface 29. A pointer 42 is fixed to the piston rod 33, and the pointer 42 is positioned on the scale plate 43 to read the position or movement amount of the piston 32 (piston rod 33) with respect to the cylinder tube 31 to restrain the vehicle 24. You can see the balance of.

Next, a vehicle fixing method and a test method using the vehicle fixing device of the present invention having the hydraulic cylinder described in detail above will be described.

As shown in FIGS. 1 and 2, front wheels 22 and rear wheels 23
By connecting a chain 25 connected to the front and rear of the vehicle 24 on which the rollers are placed on the rollers 20 and 21 and a chain 26 connected to each fixing member 30 via a hydraulic cylinder 28 by a chain block 27, 24 is fixed by pulling from 4 directions. At this time, the chain block 27 adjusts the lengths of the chains 25 and 26 by the chain block 27 so that the piston 32 is located in the intermediate position P of the movement range L in the cylinder tube 31.

However, if all four hydraulic cylinders 28 are adjusted in the same manner, the vehicle 24 is pulled in each direction by the compression springs 34 of the hydraulic cylinders 28 so that the compression springs 34 are in balance with each other. As shown, the restraining force of the vehicle 24 becomes zero due to the combined force of the compression springs 34, and the vehicle 24 stops on the rollers 20 and 21. In this state, the vehicle is fixed by the fixing device so as to be movable back and forth by a predetermined distance L / 2.

Hereinafter, a case where the power performance test of the vehicle 24 is performed will be described. In performing the test, the set values of the hydraulic cylinder 28 differ depending on the performance, type, etc. of the vehicle, but in the present embodiment, they are set as shown below in advance.

Piston moving distance L = 200 mm Maximum restraining force of vehicle F = 500 kg First, the front wheels 22 and the rear wheels 23 of the vehicle 24 are driven, and an arbitrary load is applied to the rollers 20 and 21 to cause the vehicle 24 to move.
To the running state. Now, if the vehicle 24 is forced to move forward due to sudden acceleration or gear change,
The piston 32 of the hydraulic cylinder 28 on the front side is indicated by an arrow C in FIG.
Moving in the direction, the compression spring 34 is extended. This allows
As shown in FIG. 4, the spring force of the compression spring 34 (vehicle 24
The binding force to the front of is reduced. On the other hand, in the rear hydraulic cylinder 28, the piston 32 moves in the direction of arrow D in FIG. 3 to compress the compression spring 34. As a result, as shown in FIG. 4, the spring force of this compression spring 34 (the rearward restraining force of the vehicle 24) increases. Then, the force of moving forward of the vehicle 24 and the spring force of the compression spring 34 of each hydraulic cylinder 28 (vehicle 2
The vehicle 24 until the combined force of
Is moving forward and the vehicle 24
Will stop.

With this operation, the oil in the cylinder tube 31 of the hydraulic cylinder 28 flows between the chambers A and B through the throttle valve 27 and the pipe 38. Therefore, the compression spring 34 that is compressed or expanded does not vibrate, and the piston 32 can move slowly inside the cylinder tube 31.

As described above, the vehicle 24 can move forward and backward within a predetermined range in response to a shock at high speed due to sudden acceleration / deceleration or gear change of the vehicle 24, and the forward / backward behavior is analyzed by the chassis dynamometer. Then, the power performance test is performed.

Further, by fully closing the throttle valve 37, it is possible to disable the forward and backward movement of the vehicle, which is effective for the test of the engine, the mission, the power transmission system, etc., which causes the error of the movement of the vehicle. Can be used for.

In the above-described embodiment, the case where the forward force is generated in the vehicle 24 has been described, but even when the forward force is generated, as shown in the spring characteristic diagram of FIG. Only when the operation of the hydraulic cylinder 28 is reversed, the vehicle 24 moves backward and stops.

As described above, since the vehicle 24 is fixed to the outer floor surface 29 via the hydraulic cylinder 28, the vehicle 24 may be damaged by sudden acceleration / deceleration of the vehicle 24 or a shock at a high speed due to a gear change.
Can move forward and backward, and its forward and backward behavior can be accurately analyzed by the chassis dynamometer. Further, since the oil flows in the pipe 38 during the operation of the hydraulic cylinder and the flow rate of the oil in the cylinder tube 31 in the pattern 38 can be adjusted by the throttle valve 38, the compression spring does not vibrate and the piston 32 moves slowly. To be done.

In this embodiment, the case where the 4WD vehicle is fixed by the fixing device of the present invention and the test is performed has been described.
Similarly, a WD vehicle can be fixed and tested.

Further, the vehicle fixing device of the present invention can be used in a wide variety by changing each set value of the hydraulic cylinder according to the size and performance of the vehicle or the type of test.

H. Effect of the Invention As described in detail with reference to the above-mentioned embodiment, when the vehicle is fixed by using the vehicle fixing device of the present invention, the vehicle is restrained within a predetermined range with a restraining force according to the driving force of the vehicle. It is fixed so that it can move back and forth, and its moving speed can be adjusted. As a result, a highly reliable power performance test can be performed in a state closer to the actual running state, and the chain that fixes the vehicle will not be damaged due to the longitudinal movement of the vehicle during the test.

Further, since the flow rate flowing therethrough can be adjusted by the throttle valve interposed in the bypass passage, the moving speed of the piston can be adjusted, and it can be used for various tests.

[Brief description of drawings]

1 and 2 are views showing a state in which a four-wheel drive vehicle is fixed using a vehicle fixing device according to an embodiment of the present invention. FIG. 1 is a side view and FIG. 2 is a plan view. FIG. 3 is a sectional view of a hydraulic cylinder used in a vehicle fixing device of the present invention,
FIG. 4 is a spring characteristic diagram of a compression spring of a hydraulic cylinder, and FIGS. 5 and 6 are diagrams showing a state in which a vehicle is fixed using a conventional vehicle fixing device. In the drawings, 24 is a vehicle, 25 and 26 are chains, 28 is a hydraulic cylinder (fluid pressure cylinder), 29 is a floor surface, 30 is a fixing member, 31 is a cylinder tube, 32 is a piston, 33 is a piston rod, and 34 is a compression. A spring (biasing member), 37 is an oil damper adjusting throttle valve, and 38 is a pipe (bypass path).

Claims (1)

[Scope of utility model registration request] 1. A vehicle and a fixing member approach each other to a fixing member for fixing a front portion and a rear portion of a vehicle, on which a driving wheel is mounted on a roller connected to a chassis dynamometer, to a floor surface outside the vehicle. While the fluid pressure cylinder having a biasing member for biasing the fluid pressure cylinder is connected, a bypass passage that connects two chambers defined by the piston is provided in the fluid pressure cylinder, and the variable throttle valve is provided in the bypass passage. A vehicle fixing device, characterized in that a vehicle is interposed.