JPS634131B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a variable speed steering gear testing device for tracked vehicles, which tests on a bench the running characteristics and turning characteristics of a variable speed steering gear provided in a tracked vehicle, etc. It is related to.

[Conventional technology]

Figure 1 shows a conventional test device of this type, in which the variable speed steering gear 1 as a specimen is a prime mover such as an engine 2.
Driven by. The power from the variable speed steering gear 1 is
It is output to the left and right output shafts 3, 3'. Its output is
Braking is performed by dynamometers 5, 5' which apply running resistance and turning resistance to the variable speed steering gear 1 via flyholes 4, 4'. Furthermore, the dynamometers 5, 5' can also apply power to the output shafts 3, 3' via the flyholes 4, 4'.

At this time, torque control of the dynamometers 5, 5' is performed by control current and voltage supplied from the stationary Leonard devices 6, 6'. That is, the stationary Leonard device 6, 6' has a torque meter 7,
Detection signals a, a' from 7' and torque command signal b,
b' is compared, and control currents and voltages C and C' are supplied to the dynamometers 5 and 5' so as to eliminate this deviation.
Furthermore, the torque characteristics of the output shafts 3, 3' when the variable speed steering gear 1 is mounted on a tracked vehicle are expressed by equation (1).

T=A+BN+CN ² +DdN/dt±Eμ (1) Where, T: Total resistance torque including running resistance and turning resistance A: Gradient resistance (determined by vehicle weight and slope angle) B: Rolling resistance coefficient (determined by vehicle shape) , determined by road surface conditions) N: Output shaft rotation speed C: Windage resistance coefficient (determined by vehicle shape) D: Acceleration resistance coefficient (determined by vehicle weight) E: Constant (determined by vehicle shape and dimensions) μ: Turning resistance Coefficients (vehicle cover shape, road surface conditions,
In equation (1), the first to fourth terms represent running resistance, and the fifth term represents turning resistance. Also, the first
Items 3 to 3 and 5 are such that torque is applied to the output shaft by the dynamometers 5 and 5', and
This torque is applied by the flyholes 4, 4'. Furthermore, the + sign in the fifth term is outside when turning,
The - sign indicates the case of the inside, and the output shaft rotational speed at this time is outside>inside. A related device of this type is, for example, "Meiden Jiho" published by Meidensha Co., Ltd. (No. 6, 1979).

[Problem that the invention seeks to solve]

In the conventional test equipment described above, the variable speed steering gear 1
Since running resistance and turning resistance are simultaneously applied only to the dynamometers 5 and 5', it has been difficult to conduct highly accurate tests that approximate actual running or turning conditions.

That is, running resistance is related to the rotational speed of the output shafts 3, 3' of the variable speed steering gear 1 as shown in FIG. 2, while turning resistance is related to the output of the variable speed steering gear 1 as shown in FIG. Because it is related to the rotational speed ratio of shafts 3 and 3' (inner output shaft rotational speed/outer output shaft rotational speed),
The control calculations for issuing commands become complicated, and at the same time, highly accurate braking force (driving force) cannot be obtained using only the dynamometers 5 and 5'.

Further, there is a problem that the amounts of running resistance and turning resistance applied to the variable speed steering gear 1 cannot be measured separately.

An object of the present invention is to provide a variable speed steering gear testing device for a tracked vehicle that can accurately reproduce the running characteristics or turning characteristics of a variable speed steering gear on a bench, and can separately measure running resistance and turning resistance applied. It's about doing.

[Means for solving problems]

The above purpose is to provide a brake that provides running resistance to the driving force from the variable speed steering device on both output shaft sides of the variable speed steering device, and a control drive dual-purpose device that provides turning resistance to the driving force or braking force. [Operation] When testing a variable speed steering gear, running resistance and turning resistance are applied to the output shaft. At this time, the power applied to the output shaft is divided between a brake for running resistance and a brake/drive combination for turning resistance. As a result, the variable speed steering gear is given the sum of both powers and can be tested. Furthermore, by arranging them in parallel, the applied power can be measured separately.

〔Example〕

An embodiment of the test apparatus of the present invention will be described below with reference to the drawings. In FIG. 4, the same reference numerals as in FIG. 1 indicate the same parts.

8, 8' are the left and right output shafts 3 of the variable speed steering gear 1,
The power distributors 8, 8' are provided on the output shafts 3', for example, are gear mechanisms, and the power distributors 8, 8' divide and output the power from the output shafts 3, 3'. Reference numerals 9 and 9' indicate brakes for, for example, a hydraulic dynamometer, which are installed on one side of the output shafts 10 and 10' of the power distributors 8 and 8'; Running resistance is applied to the driving force output from the shafts 10, 10' via the torque meters 7, 7'. Reference numerals 11 and 11' designate brake/drive machines for, for example, a hydraulic pump and motor, which are provided on the other output shaft 12, 12' side of the power distributors 8, 8' in parallel with the dynamometers 9, 9'. The brake/drive dual-purpose machines 11, 11' operate the power distributors 8, 8' according to the turning direction of the variable speed steering machine 1 (when there is a difference in rotational speed between the output shafts 3, 3', it turns with the high speed side on the outside). Turning resistance is applied to the driving force (braking force) outputted from the output shafts 12, 12' via the torque meters 7, 7'.

Next, the operation of the test apparatus of the present invention will be explained.

First, in normal straight running condition (left and right output shafts 3,
Since the rotational speed of 3' is the same, no turning resistance occurs. ), the brakes 9, 9' apply braking force (running resistance) according to the rotational speed of the output shafts 3, 3' of the variable speed steering gear.
Granted by. At this time, the brake/drive combination machine 1
1 and 11' rotate freely regardless of the rotational speed of the output shafts 3 and 3' of the variable speed steering gear 1 (braking and driving forces do not generate turning resistance and become 0 because there is no rotational difference in the output shafts). are doing.

In addition, in the test in the turning running state, the turning direction of the variable speed steering gear 1 was, for example, leftward (arrow F in the figure).
direction), the sign of the fifth term in equation (1) becomes negative, and a braking force is generated as turning resistance on the output shaft 3 side of the variable speed steering gear 1, so-called inner cover of the tracked vehicle.
On the other hand, on the output shaft 3' side, the so-called outer cover of the tracked vehicle, the sign of the fifth term in equation (1) becomes positive, and a driving force is generated as turning resistance. Therefore, the power of the output shaft 3 corresponds to the turning resistance (a value calculated externally from the left and right rotational speed ratio) with respect to the braking force output from the output shaft 12 side of the power distributor 8 via the torque meter 7. Driving force is applied by a brake/drive unit 11. Furthermore, the power of the output shaft 3' is generated by turning resistance (an externally calculated value based on the left and right rotational speed ratio) against the driving force output from the output shaft 12' side of the power distributor 8' via the torque meter 7'. ) is applied by the brake/drive unit 11'. At this time,
The brakes 9, 9' apply a braking force (running resistance) to the driving force from the variable speed steering gear 1 in accordance with its rotational speed, as in the straight-ahead running state.

In addition, the control of the brakes 9, 9' and the brake/drive devices 11, 11' is performed based on the deviation between the detection signals from the torque meters 7, 7' on the respective shafts and the torque command signal, as described above. This is done by corresponding control signals.

In other words, the first to third terms of equation (1) are
The fourth term given by is given by flyhole 4, 4',
The fifth term is applied separately by the brake/drive combination machines 11, 11'.

〔Effect of the invention〕

According to the variable speed steering gear test device for a tracked vehicle of the present invention, a control system that applies running resistance to the driving force output from the variable speed steering gear is applied to both output shaft sides of the variable speed steering gear of the test object. Since the motive force and the driving force or the brake drive/drive unit that applies turning resistance to the braking force are installed in parallel (separately), the running characteristics or turning characteristics of the variable speed steering device can be separated and externally controlled. This makes it possible to easily and accurately reproduce tests similar to actual vehicle running conditions on a bench using a variable speed steering system, and to measure the amount of running resistance and turning resistance applied separately. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining a conventional variable speed steering gear test device for tracked vehicles and its control means; Fig. 2 is a graph showing the relationship between running characteristics and rotational speed in tracked vehicles; Figure 3 is a graph showing the relationship between turning characteristics and rotational speed ratio in tracked vehicles.
FIG. 4 is a diagram for explaining the variable speed steering gear testing device for tracked vehicles of the present invention. 1... variable speed steering gear, 8, 8'... power distribution machine,
9, 9'... Brake machine, 11, 11'... Brake/drive combination machine.

Claims (1)

[Claims] 1. In a device for testing the running characteristics or turning characteristics of a variable speed steering gear for a tracked vehicle using the driving force from the prime mover, there is a A variable speed steering gear test device for a tracked vehicle, characterized in that a brake that provides running resistance and a brake/drive combination device that provides turning resistance to driving force or braking force are provided in parallel.