JPH0449564Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an improvement of a swing bearing device for a vertical dynamometer.

B. Summary of the invention The present invention provides a bearing box for holding a bearing at the bottom of a vertical dynamometer, and configures a swing bearing between this bearing box and a bearing stand on the base. An outer cover is provided on the base, separate from the main body, and a cooling blower is connected to this outer cover, improving the centering accuracy of the swing bearing, eliminating the need for a highly rigid outer cover, and installing a cooling blower. The aim is to improve sexual performance, etc.

C. Prior Art As an example of a vertical dynamometer, FIG. 2 shows a partial half cross section of a vertical AC dynamometer. This dynamometer is used for torque measurement.
The main body (the stator of a normal electric motor) swings around its axis.

Brackets 2, which together with the stator and frame 1 constitute the main body, are provided at both upper and lower ends of the frame 1, on which the stator is attached. A rotating shaft 4 is rotatably supported. Bearing 3
are positioned and attached by small inner lids 5a provided on the inside and outside of the bracket 2. A slit plate 6 for detecting the rotational speed is attached to a portion of the rotating shaft 4 that projects downward from the bearing 3.

On the other hand, a cylindrical outer cover 8 with a bottom is attached to the bone member 7 of the bracket 2, which is fitted onto the bone member 7 and secured with bolts, and the lower end of the outer cover 8 is attached to the bone member 7 on the base 9. is supported by a swing bearing. In the figure, 11 is a bearing component formed integrally with the outer cover 8, and 12 is a steel ball interposed between the bearing stand 10 and the bearing component 11, and together with these two members constitutes the swing bearing 13. be.

Note that a ventilation port 14 for drawing in cooling air is opened in a part of the outer cover 8, and a small gap g is provided between the ventilation port 14 and the ventilation port 14 of the cooling blower 15. 15a is coming.
The arrows in the figure indicate the flow of cooling air.

D Problems to be Solved by the Invention In the dynamometer having the above configuration, the outer cover 8 needs to be rigid because the entire weight of the main body consisting of the frame 1, stator, etc. is applied to the outer cover 8. As a result, the increased rigidity of the outer cover 8 also resulted in an increase in cost. In addition, it is troublesome to assemble the outer cover 8 to the frame member 7, and since the outer cover 8 is fitted and attached only to the frame member 7, the center of the swing bearing 13 tends to be eccentric, which also impairs the ease of assembly. was. Furthermore, since the outer cover 8 swings together with the main body, it is necessary to separate the ventilation port 14 of the outer cover 8 and the ventilation port 15a of the blower 15 by providing a gap g, resulting in a loss in the amount of cooling air. had no choice but to accept it.

E. Means for Solving the Problems In order to solve the above problems, in the present invention, a bearing box that is provided at the center of the lower part of the main body of the vertical dynamometer and holds a bearing that supports the rotating shaft has a bearing box that is concentric with the rotating shaft. A shaft is provided to protrude downward, and a swing bearing is formed between a bearing stand provided on a base and the shaft, while an outer cover is provided on the base and extends to the lower part of the main body, This outer cover was provided with a ventilation hole, and a cooling blower was connected to the ventilation hole to form a swing bearing device.

F Effect In the rocking bearing device having the above configuration, the dynamometer main body that rocks with the rotation of the rotating shaft (rotor) is driven by the rocking bearing constructed between the shaft of the bearing box and the bearing stand. It is supported. Cooling air is supplied through ventilation holes in the outer cover, which is separate from the main body.

G. Embodiment FIG. 1 shows a half cross section of a swing bearing device for a vertical dynamometer according to an embodiment of the present invention.

The structure other than the swing bearing part is the same as the conventional one shown in FIG. In other words, the stator,
A bracket 2, which together with the frame 1 constitutes a main body, is provided. A rotating shaft 4 integral with a rotor is rotatably supported at the center of the bracket 2 via a bearing 3.

Hole 1 of the bracket 2 in which the bearing 3 is provided
A bearing box 17 is provided concentrically with the rotating shaft 4 so as to be fitted into the rotating shaft 4 and in full contact with the lower end surface 2a of the bracket 2. The bearing box 17 is connected to a small inner cover 5a provided inside the bracket 2 by bolts 18, and the bearing 3 is positioned and fixed in the axial direction by the bearing box 17 and the small inner cover 5a.
The bearing box 17 has a shaft portion 17a concentric with the rotating shaft 4.
is provided to protrude downward. This shaft part 1
7a is a stepped shaft.

A bearing stand 19 having a stepped hole 19a is provided on the base 9 coaxially with the rotating shaft 4,
A swing bearing 20 is constructed between the shaft portion 17a of the bearing box 17 inserted into the hole 19a of the bearing stand 19. The swing bearing 20 includes a radial bearing 21 that supports the shaft portion 17a in the radial direction with respect to the bearing stand 19, and a thrust bearing 22 that supports the shaft portion 17a in the axial direction by the bearing stand 19.

On the other hand, the lower end of a cylindrical outer cover 23 is fixed onto the base 9 by bolts 24. The upper end of the outer cover 23 extends around the lower part of the dynamometer body. The outer cover 23 is provided with a ventilation port 24, and a cooling blower 25 is provided by connecting a ventilation port 25a to the ventilation port 24. outer cover 2
3 is separate from the dynamometer body, so
There is no need to support a large load, and the wall thickness can be made thin and lightweight.

Note that since the bearing box 17 is located at the lower end of the rotating shaft 4, the slit plate for detecting the number of rotations is replaced at the upper shaft end.

In the swing bearing device configured as described above, the swing of the main body (stator, frame 1, bracket 2, etc.) is supported by a swing bearing 20 consisting of a radial bearing 21 and a thrust bearing 22. Measuring torque is
This is done by a load cell that engages with an arm extending from the frame 1 of the main body.

In this oscillating bearing device, since the bearing box 17 also integrates the small outer cover 5b before the improvement, the machining of the bracket 2 is not required by the amount of inlay machining and tap machining for attaching the outer small cover. In addition, bearing box 17
Since it is firmly fixed to the center of the bracket 2, its centering accuracy is high.
0 also has a highly accurate structure with no eccentricity or deformation.

Since the outer cover 23 is separate from the dynamometer main body, it does not need to receive the load of the main body as described above, and therefore does not need the rigidity that was conventionally required, and can function as a wind guide, which is its original function. As long as it works, it can be made thin and light. Furthermore, since the cover 23 does not swing, the air outlet 25a of the cooling blower 25 can be directly connected to the air outlet 24 of the outer cover 23, and there is no need to provide a gap as in the conventional case. The air volume of 25 will effectively contribute to cooling the main body. Note that in the figure, arrows indicate the flow of cooling air.

In addition, if the present invention is a vertical dynamometer,
Applicable to both AC and DC types.

G Effect of the invention According to the swing bearing device for a vertical dynamometer according to the invention, the bearing box that is shared with the conventional outer small lid is supported by the swing bearing, so that it is integrated with the main body as in the conventional case. Unlike supporting the outer cover on a swinging bearing, centering accuracy is improved, and the use of the outer cover and bearing box in common improves assembly efficiency and reduces costs. In addition, since the outer cover is separate from the dynamometer body, it can be made thinner and lighter, and a cooling blower can be directly connected, allowing cooling air to contribute effectively to cooling. .

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a swing bearing device for a vertical dynamometer according to an embodiment of the present invention, and FIG. 2 is a half-sectional view of a conventional swing bearing device. In the drawing, 1 is a frame, 2 is a bracket, 3 is a bearing, 5a is an inner small lid, 9 is a base, 17 is a bearing box, 17a is a shaft of the bearing box, 19 is a bearing stand, 21
22 is a radial bearing, 22 is a thrust bearing, 23 is an outer cover, 24 is a ventilation hole, and 25 is a cooling blower.

Claims (1)

[Scope of utility model registration request] A bearing box that is provided at the center of the lower part of the main body of the vertical dynamometer and holds a bearing that supports the rotating shaft is provided with a shaft portion concentric with the rotating shaft protruding downward, and a bearing stand provided on the base. A rocking bearing is formed between the base and the shaft portion, and an outer cover is provided on the base that extends to the lower part of the main body, and the outer cover is provided with a ventilation port, and the ventilation port is connected to the ventilation port of a cooling blower. A swing bearing device for a vertical dynamometer, which is characterized by being connected.