JPH01132922A - Dynamometer swing mechanism - 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 [Field of Industrial Application] The present invention relates to a swinging mechanism for a dynamometer, and particularly to a swinging mechanism for a dynamometer suitable for measuring the power of a drive source with large radial load fluctuations.

[Conventional technology]

As is well known, a dynamometer has an automatic scale or load cell inserted between a swingably supported body frame and a fixed base via a torque arm, which measures the reaction force of the power transmitted from the drive source to the body frame. It measures the force and the torque of the drive source. therefore,
Since friction loss in the swinging portion directly results in measurement errors, it is effective to minimize friction loss by levitating the main body frame with pressurized fluid to improve measurement accuracy.

As a conventional dynamometer levitation swing mechanism, Japanese Patent Application Laid-open No. 5
No. 7-14730 describes a system in which, as shown in FIG. 4, the cylindrical dynamometer body frame 101 is an arc-shaped oscillator equipped with a buoyancy pad made of pressurized fluid, which will be described later. The main body frame 101 is simply placed on the moving part 51102, and the main body frame 101 swings on the arc of the swing device 102. In Fig. 6, 103 is a frame on which the swing device 102 is installed, and 104 is the main body. This is an automatic scale connected to a frame 101 via a torque arm (not shown).

[Problem that the invention seeks to solve]

The above conventional technology does not have a damping force against radial load fluctuation due to its structure, so the radial load capacity is
There was a problem with vibration resistance. In particular, when applied to an engine dynamometer that measures engine power, the radial load fluctuation due to engine vibration is extremely large, so the dynamometer cannot be directly connected to the engine, and an intermediate device between the engine and the dynamometer is used. Bearings had to be installed.

An object of the present invention is to minimize friction loss in the swinging part.

Another object of the present invention is to provide a swinging mechanism for a dynamometer that has sufficient vibration damping force even against radial load fluctuations and has excellent load resistance and vibration resistance.

[Means for solving problems]

In order to achieve the above object, the present invention provides an annular swing frame on both axial sides of a main body frame of a dynamometer,
A support frame facing the swing frame is installed on a pedestal, and a plurality of pairs of levitation pads using pressure fluid are provided on the support frame to levitate the swing frame in the axial direction and the circumferential vertical and horizontal directions, The present invention is characterized in that the main body frame of the dynamometer is floated and rocked by the support frame having the floating pad and the rocking frame.

[Effect]

With the above configuration, the fluid pressure of the floating pad that levitates the annular swing frame vertically and horizontally around the circumference acts as a damping force against load fluctuations in the radial direction, and also acts as a damping force in the thrust direction. The fluid pressure of the floating pad that levitates the annular swing frame in the axial direction acts as a vibration damping force against load fluctuations, so sufficient vibration damping force can be obtained against load fluctuations in any direction. Moreover, friction loss can be minimized.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, to explain the configuration, as shown in FIG. 1, an annular swing frame 2 is provided on both axial sides of a dynamometer main body frame 1 positioned on a pedestal 4, and a support frame 3 is provided.
is opposed to. The support frame 3 is installed on a pedestal 4, and as shown in an enlarged view in FIG. Floating pads 5 and 6 made of pressurized fluid are provided on the outer circumferential surface of the support frame 3, respectively, and there is a very small distance between the opposing surfaces. Further, the support frame 3 is provided with a fluid pressure supply port 10 to the flotation pads 5 and 6 and a fluid discharge port 11 from the intermediate portion of the flotation pads 5 and 6, and furthermore, seals 12 and 13 are provided to prevent pressure fluid from flowing to the outside. 0 Body frame that prevents leaks 1
Swing frame on both sides in the axial direction 2. The support frame 3 is symmetrically formed.

FIG. 3 is a view in the direction of arrow A in FIG. 1, and shows the arrangement of the floating pads 5°6 on the circumference.
Four pairs are provided on the circumference: upper and lower, left and right.

In FIGS. 1 and 3, 7 is an automatic scale, 8 is a torque arm, and 9 is a power shaft of a dynamometer.

In the above configuration, the pressure fluid P is
If S is pumped (the pressure feeding port 10 is provided for each of the four pairs of floating pads 5 and 6 of each support body 3, and the fluid is pumped to the four pairs of floating pads at the same time), the floating pads 5 and 6 will be pumped. A fluid film is formed between the fluid pool and the opposing surface of the swing frame 2.

If the pumped fluid has sufficient pressure, the flotation pad 5 will absorb the thrust load and the opposite side of the main body frame 1: 4. By balancing the pressure with the lifting pad 5, the swing frame 2. That is, the main body frame 1 is floated in the axial direction. Similarly,
The floating pad 6 floats the main body frame 1 in the vertical and horizontal directions of the circumference by balancing the own weight and radial load of the main body frame 1 and the pressure with the floating pad 6 on the opposite side of the circumference. In this way, the support frame 3 and the swing frame 2 having the levitation pads 5 and 6 can levitate and swing the main body frame 1 of the dynamometer with minimal friction loss. As described above, sufficient vibration damping force can be obtained by the floating pad 5 against load fluctuations in the thrust direction, and by the floating pad 6 against load fluctuations in the radial direction.

In the above embodiment: 4 The floating pad 6 is provided on the inner circumferential side of the annular swing frame 2, but it may be provided on the outer circumferential side. If the double bearing structure is provided on the outer circumference side, the fluid pool surface that maintains the buoyancy force of the floating pad 6 can be made large on the inner circumference side and the outer circumference side, so the axial width of the swing mechanism can be reduced. There are advantages.

〔Effect of the invention〕

According to the present invention, the levitation force of the levitation pad 6 acts as a sufficient vibration damping force against the radial direction load fluctuation of the drive source acting on the power shaft of the dynamometer, so the dynamometer has excellent load resistance and vibration resistance. A swinging mechanism for the meter can be obtained. As a result, even when applied to an engine dynamometer, there is no need to provide an intermediate bearing between the engine and the dynamometer.

Direct connection to the engine is possible, eliminating measurement errors due to power loss in intermediate bearings, and reducing equipment costs. Further, in the swing mechanism according to the present invention, the swing frame can be easily attached to a general-purpose electric motor, so that a dynamometer can be easily constructed using a general-purpose electric motor.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a floating pad portion, Fig. 3 is a view taken in the direction of arrow A in Fig. 1, and Fig. 4 is a conventional floating swing mechanism. FIG. 2 is an external view of a dynamometer having a 1... Main body frame, 2... Swing frame, 3... Support frame, 4th 2121 hand 4 figure

Claims (1)

[Claims] 1. It consists of an annular swinging frame provided on both axial sides of the main body frame of the dynamometer, and a support frame installed on a pedestal so as to face this swinging frame. A plurality of pairs of levitation pads using pressurized fluid are provided to levitate the frame in the axial direction and the circumferential vertical and horizontal directions, and the main body frame of the dynamometer is levitated and oscillated by the support frame having the levitation pads and the swing frame. A dynamometer rocking mechanism characterized by the following.