JPH0439026B2 - - Google Patents

Description

[Detailed description of the invention]

B. Field of the Invention The present invention relates to improvements in a power circulation test device for conducting torsional fatigue tests on propeller shafts and drive shafts including universal joints. B. Prior Art A power circulation type testing machine with low power consumption is known. Methods of applying torque to the specimen in this type of testing machine include using a hydraulic rotary actuator and applying torsional torque to the entire gear box with the specimen attached using a hydraulic cylinder, etc. be. One aspect of the type that uses a hydraulic rotary actuator is US Patent No.
Disclosed in No. 3690168. This conventional testing machine includes a hydraulic rotary actuator that receives pressure oil from a hydraulic pump via a solenoid valve and a rotary joint. Because of this configuration, this type has the following drawbacks. First, due to the structure of the hydraulic rotary actuator, the twist angle is limited to ±100°. Therefore, when testing a specimen with low torsional rigidity or a long shaft length, the necessary torque to be applied may not be obtained. Furthermore, since the rotary actuator rotates together with the sample, a rotation joint is required for oil supply, and prevention of oil leakage must be taken into consideration, resulting in a complicated structure. Additionally, a zero point detection mechanism is also required. Furthermore, because it is hydraulic, it has low efficiency and requires a large installation area. Note that even if the gearbox is of a type that rotates the entire gear box, there are still drawbacks such as the inability to obtain a large twist angle. C. Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional power circulation testing machines. More specifically, it is an object of the present invention to provide a power circulation test device that has a relatively simple structure, a wide range of applications, and can easily and accurately control the torque load. D. Structure of the Invention This invention provides a pair of mutually parallel shaft series to which shafts with universal joints are attached as test products, a power circulation gear train for circulating power between the pair of shaft series, and a gear train for circulating power between the pair of shaft series. A drive device connected to one side of the shaft series, a bounding device that can move up and down to give the universal joint an operating angle in a vertical plane, and a bouncing device that swings around the vertical axis to give the universal joint an operating angle in a horizontal plane. A power circulation type test device comprising a steering section of a rotor, and a torque loading device connected to one of the pair of shaft trains, wherein the torque loading device is connected to an inner solar panel connected to one of the shaft trains. circumscribed by the gear and the inner sun gear,
A planetary gear coupled to the gear of the power circulation gear train via a carrier, an outer sun gear circumscribing the planetary gear, a torque load servo motor carrying a pinion that meshes with the outer sun gear, and a torque load by the servo motor. The invention is characterized by comprising a control unit that controls. E. Effects of the Invention Because the present invention has the above configuration, the torsion angle can be set infinitely, and any torque can be applied even when the shaft has low rigidity or is long, or when there are a large number of specimens. This, combined with the ability to adjust the torque value to be loaded by the servo motor, has an extremely wide range of applications.
Guarantees easy and accurate control of torque settings. Therefore, as an example, it becomes possible to operate the test machine based on a program that simulates the actual driving condition of a car. Furthermore, it is more efficient than conventional hydraulic systems, requires less installation space, and does not require a complicated structure with rotating joints or oil leakage countermeasures. In addition, since the planetary gear mechanism can be mounted on the same rotating shaft as either the α-axis or the β-axis, the entire load device becomes simple and compact, which is advantageous. In addition, since the vertical movement of the bounding device gives the universal joint an operating angle in the vertical plane, the mounting position of the universal joint and the grease condition inside the joint are the same as on the actual vehicle. Highly reliable tests can be conducted under conditions closer to those of the actual vehicle. Furthermore, since a steering section is provided that gives a steering angle to the universal joint by swinging around a vertical axis, the bouncing device and the steering section work together to test the drive shaft of a front-wheel drive vehicle under conditions close to those of an actual vehicle. It can be done with As described above, the power circulation test device of the present invention is particularly effective for testing automotive universal joints under conditions closer to those of actual vehicles and for accurately and efficiently evaluating the performance of universal joints. F. Embodiments The features of this invention will become clearer from the following description of embodiments shown in the drawings. In the illustrated embodiment, a drive shaft or a propeller shaft of an automobile is assumed as a shaft with a universal joint, which is a test product. First, referring to a drawing schematically showing the overall configuration of a power circulation test machine, four specimens 10 each having a constant velocity joint at both ends are attached, a driving device 20, a bounding device 30, the steering device 40, and the torque load device 50 constitute a power circulation system. A pair of specimens 10 are connected to each series of α-axes and β-axes arranged above and below. The drive device 20 connects the sample 1 via a V-belt 21.
0 includes a DC motor 22 that transmits power to the motor. The bounding device 30 is guided by a column attached via a rolling bearing, and is moved vertically in the figure by a servo cylinder 31, giving the constant velocity joint an operating angle in a vertical plane. This results in
It is possible to provide the so-called bound angle that occurs on the axle due to the vertical vibration of the wheel due to the unevenness of the road surface, as well as the operating angle that is normally given to the joint. The bounding device 30 includes a servo cylinder 32 for giving sliding movement in the axial direction to the joint.
and a ball slide 33 can be added. The steering section 40 is for giving the joint an operating angle in the horizontal plane as a steering angle, and has a structure in which the entire gearbox 42 is swung around a vertical shaft 43 by a servo motor 41. Drive device 20, bound device 30, steering device 4
0 and the torque load device 50 independently constitute a closed control loop, but only the loop of the torque load device 50, which is the gist of the present invention, is shown. The torque load device 50 includes an inner sun gear A coupled coaxially with the α axis, a planetary gear B coupled to one D of a pair of power circulation gears D and E via a carrier 51,
and a planetary gear mechanism 5 consisting of an outer sun gear CF
2, and a servo motor 54 that rotationally drives a gear G meshing with the outer sun gear CF via a reduction gear 53. By connecting the planetary gear B and the power circulation gear D via the carrier 51, the circumferential speed of the gear train can be kept low. Furthermore, the power circulation gear and the planetary gear mechanism can be easily connected in terms of design, contributing to the compactness of the entire device. In the illustrated example, the control unit 55 has a function of controlling the torque load applied to the servo motor 54 based on a signal from a torque meter 56 mounted on the β-axis and a predetermined command signal. Next, we will describe the operation of this embodiment of the apparatus having the above configuration, that is, the mechanism in which torque is applied to the power circulation system and the α- and β-axes rotate at the same time. In addition, below, the number of teeth of related gears will be expressed by the following symbols.

[Table] The torque load is applied to the reducer 5 by the servo motor 54.
This is done by rotating gear G via 3.
That is, when the gear G rotates, the outer sun gear CF and the planet gear B of the planetary gear mechanism 52 that mesh with the gear G rotate, and the phase of the planet gear B and the gear D integrally connected to them via the carrier 51 rotates. , the phases of the inner sun gears A are different from each other, and as a result, the specimen 10 is connected to the power circulation system.
A torsional moment (torque) is applied to the Assuming that the inner sun gear A of the planetary gear mechanism 52 is fixed and the gear G rotates by θ°, and when calculating the rotation angle of each axis, the outer sun gear CF that meshes with the gear G is Zg/Zf. Rotates by ×θ°, planetary gear B
Rotate. At this time, the rotation angle of the carrier 51 and therefore the gear D connected thereto is
It is expressed as Zc/Za+Zc×Zg/Zf×θ°. Since gear E rotates with respect to gear D at a ratio of Zd/Ze, gear G
When rotates θ°, gear E becomes Zc/Za+Zc×Zg/Zf×Zd/
It rotates by Ze× θ°, and as a result, torque is applied to the entire system. In this state, the α-axis and β-axis rotate, but now consider the case where the outer sun gear CF is fixed and the α-axis rotates at an angular velocity of ωα. The rotational angular velocity of the carrier 51 and gear D at this time is
Za/Za+Zc×ωα, and the speed will be decelerated once. Therefore, in order to equalize the rotation speeds of the α-axis and the β-axis, the gear E must be used to increase the speed. For this purpose, the number of teeth Ze of the gear E is set to a value that satisfies the relationship Za/Za+Zc×Zd/Ze=1.

[Brief explanation of drawings]

The drawing is a schematic diagram of a power circulation testing machine equipped with a torque loading device, which is an embodiment of the present invention. 10... Sample, 50... Torque load device, 5
2... Planetary gear mechanism, G... Pinion, 54...
Servo motor, 55...control unit.

Claims (1)

[Claims] 1 A pair of shafts parallel to each other to which a shaft with a universal joint is attached as a specimen, a power circulation gear train for circulating power between the pair of shafts, and a gear train connected to one of the pair of shafts. a driving device, a bounding device movable up and down to provide an operating angle to the universal joint in a vertical plane, a steering unit movable about a vertical axis to provide an operating angle to the universal joint in a horizontal plane, and It is composed of a torque load device connected to one of the pair of shaft series, and the torque load device is connected to an inner sun gear connected to one of the shaft series, and is circumscribed to the inner sun gear, and the torque load device is connected to the inner sun gear through a carrier to drive the above-mentioned power. a planetary gear coupled to a gear of a circulation gear train, an outer sun gear circumscribing the planetary gear, and a torque load servo motor carrying a pinion that meshes with the outer sun gear;
1. A power circulation test device comprising: a control unit that controls a torque load caused by a servo motor;