JPH03211440A - Durability testing device for motorbicycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a motorcycle durability testing device, and more specifically, it tests the durability of a motorcycle when repeatedly started suddenly with the main stand up. related to a device for

(Prior art) Some people who use scooters or family bikes
Some people start their cars by starting the engine with the main stand up and causing a sudden start. When starting in this manner, a large load is applied to the rear wheel, which was rotating at high speed, at the moment it touches the ground, so a strong return torque is applied to the rear wheel support shaft, that is, the final shaft, and if this is repeated, the shaft will be damaged. Problems arise that may lead to accidents such as damage.

Although this method of starting is not desirable,
Even when used in this way, manufacturers need to thoroughly check the safety and durability of the vehicle body.

However, when this type of test is conducted in the field, test conditions such as wheel rotation speed change each time, and there are individual differences between riders, resulting in unstable test results and the possibility of falls, etc. This poses problems in terms of operational efficiency, such as the risk of injury and the physical fatigue of the rider, and the need to repeat many tests, which requires a long time.

Of course, regarding the durability test of motorcycles,
As seen in Japanese Utility Model Publication No. 282239 and Japanese Utility Model Application No. 61-344489, have there been proposals in which a load is repeatedly applied to the center of gravity of a motorcycle, or a tire wheel assembly is repeatedly dropped?
These are all what can be called static repeated tests, and the problem is that they cannot check for various defects caused by dynamic factors that occur when the main stand is erected and the vehicle is suddenly started. have.

(Problems to be Solved by the Invention) The present invention was made in view of these problems, and its purpose is to stabilize the test results similar to those obtained when suddenly starting with the main stand up. The purpose of the present invention is to provide a new and efficient motorcycle durability testing device that can be used to derive the desired results.

(Means for Solving the Problems) That is, the present invention provides a motorcycle durability test device for achieving the above problems, which includes a front wheel holding means for holding the front wheel in a grounded state, and a means for holding the front wheel at an arbitrary set height. Adjustable vehicle body lifting and dropping means that lifts the rear part of the vehicle body until it reaches position 1 and then drops the rear part of the vehicle body from the lifted position at a substantially free fall speed, and adjustment that rotates the rear wheels until a desired set speed is reached in the lifted state. It consists of a means for freely opening and closing the throttle valve.

(Function) In a field test, the lifting height of the rear wheels was set to generate torsional torque equal to the torsional torque applied to the final shaft, and at the same time the rear wheels were rotated at the set speed while the vehicle body was dropped. It enables a simulation similar to the actual starting method of starting the engine with the main stand upright, and performs durability tests by automatically and repeatedly applying a uniform load to the final shaft.

(Example) Therefore, the illustrated embodiment will be described below.

Fig. 1 shows the testing section W of a bailer according to an embodiment of the present invention. In Fig. 0, reference numeral 1 denotes a tower-shaped main frame in the form of an isosceles triangle assembled by supports 2.2. , An air cylinder 4 for lifting and dropping the test bike W is suspended from the upper plate 3 fixed to the top thereof via a screw 6 for vertical adjustment, and a band 7 attached to the lower end of the rod 5 is suspended. It is configured to suspend and hold the rear part of the test bike W through the handle.

On the other hand, the base part of the main frame 1 also serves as the test section of the test bike W, and on one side of the suspended band 7 there is a front wheel support stand 8, and on the other side there is a rear wheel support stand 14. It is set up. As shown in FIG. 3, the front wheel support stand 8 includes a front plate 9 that suppresses the protrusion of the front bike Wf, a fixed clamping plate 10 arranged in parallel behind the front plate 9, and a movable clamping plate that moves forward and backward with a screw 12. The rear wheel holder is configured to hold the front wheel Wf of the bike between the holder 11 and the rear wheel holder 14, which is a replaceable board made of stone or concrete in order to obtain results as similar to those of the field test as possible. On the other hand, the reference numeral 20 in the figure is a pneumatic control mechanism that controls the opening and closing of the air cylinder 4 for lifting and dropping and the throttle valve of the test bike W. The vehicle body lifting circuit 23 and the brake circuit 28 control the air cylinder 4 for lifting and dropping, and a control circuit 30 for opening and closing the throttle valve.

The vehicle body lifting circuit 23 is connected to a pressurized air supply source 21 via an air regulator 22, and one side is branched via a 4-bot, 2-position switching valve 24, and has a flow path control valve 25 with relief. The other branch is connected to the down boat 4a of the air cylinder 4 for lifting and dropping through the air cylinder 4.
It is configured to be connected to the upboard 4b in an M connection. Moreover, the brake circuit 28 is for improving the operational response of the air cylinder 4, and is for the purpose of improving the operational response of the air cylinder 4.
1 and the brake boat 4c of the air cylinder 4, a 3-bot 2-position rich switching valve 29 is disposed between the brake boat 4c of the air cylinder 4. On the other hand, the throttle valve opening/closing control circuit 30 is a three-bottom, two-position switching valve in order to adjustably operate a spring-charged air cylinder 31 for opening/closing the throttle valve using air from the pressurized supply source 21. A flow rate regulating valve 33 is disposed between the air cylinder 32 and the air cylinder 31.

Note that reference number 18 in Figure 1 is a tachometer that detects the engine speed, 19 is a counter that counts the number of times the vehicle body falls, and number 34 in Figure 2 is a throttle valve opening/closing control. The air regulators in the circuit 30 and 35 each represent a carburetor.

In order to conduct a durability test on the test bike W using snowmaking configured in this way, the final shaft size, final gear specifications, tire size, etc. differ depending on the type of biker, so first select the biker W that should be tested. Next, we set up the main stand, and then conducted a field test in which we raised the engine speed to, for example, 6,500 rpm and started suddenly.The torsional torque generated on the final shaft at this time was measured using a strain gauge attached to this shaft. Measured by

Next, this Baira W was set in the test equipment, the rear end was lifted, and the engine speed was set to 65 as in the field test.
The torsion torque applied to the rear wheel support shaft, that is, the final shaft, was measured at each lifting height. seek.

Then, the lifting height of the rear wheel W is determined based on the measured value of the torsional torque obtained in the field test and the measured value of the point of failure, and the air cylinder 4 for lifting and dropping is adjusted to this lifting height. Adjust the height of the air cylinder 3 and roughly operate the flow rate adjustment valve 33 of the throttle valve opening/closing control circuit 30 until the engine speed reaches 6,500 rpm.
Adjust the stroke of 1.

Then, in this state, the rod 5 is contracted to lift the rear part of the test bike W, the rear wheel W1 is positioned at the set height, the engine is started by operating the air cylinder for opening and closing the throttle well, and then the engine is started. When the engine speed reaches the set value, the switching valves 24 and 29 of the vehicle body lifting circuit 23 and brake circuit 28 are switched, and air is rapidly discharged from the up port 4b and brake port 4C of the lifting and dropping air cylinder 4. On the other hand, the preset flow rate adjustment valve 25
By causing air to flow into the down port 4C of the air cylinder 4 through the air cylinder 4, the rear wheel W1 of the bailer W is dropped onto the platform 14 at a speed close to the free fall speed, and this operation is repeated for example at +000@ Verify the durability of the final shaft by repeating it several times.

(Effects) As described above, according to the present invention, the adjustable means for lifting and dropping the vehicle body and the means for opening and closing the throttle valve are connected so that a torque equal to the torsional torque applied to the final shaft in the field test is generated. The lifting height of the wheels was set, and at the same time the car was rotated at a set speed while the car body was dropped.This simulates the same way as the actual starting method of standing up the main stand, starting the engine, and suddenly starting the car. Based on this, a uniform load can be automatically and repeatedly applied to the final shaft, and
This type of test can be performed efficiently without requiring human labor. Moreover, since the rear part of the vehicle body is lifted up and supported, this type of test can be carried out safely without overturning the vehicle body despite repeated operations.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a device showing one embodiment of the present invention, Fig. 2 is a block diagram of a pneumatic control circuit used in this device, and Fig. 3 is a block diagram of a pneumatic control circuit used in this device.
The figure is a perspective view showing the front wheel support mechanism, and FIG. 4 is a diagram showing the correlation between lifting height and torsion torque. 1...Machine frame 4...Air cylinder for lifting and dropping the car body 8...Front wheel support stand 14...The wheel receiver is the stand 23...Car body lifting circuit 28...Brake Circuit 3o...Throttle valve opening/closing control circuit W...Test bike

Claims (1)

[Claims] A front wheel holding means holds the front wheels on the ground, and the rear part of the vehicle is lifted until the rear wheels reach a desired set height position.
and adjustable vehicle body lifting and dropping means for dropping the rear part of the vehicle body from the lifting position at a substantially free fall speed;
A durability testing device for a motorcycle, comprising an adjustable throttle valve opening/closing operation means for rotating the rear wheel in a lifted state until it reaches an arbitrary set speed.