JP3477684B2 - Bearing structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure for a rotating member such as a door of audio equipment. 2. Description of the Related Art Generally, in audio equipment and the like, a rotating door of a type that opens and closes vertically with a horizontal rotating shaft as a fulcrum, for example, as shown in FIG. 1
2 is rotatably held by a bearing member 13 and attached to a fixed machine frame 15 in a state where a constant torque is applied by a wave washer 14. [0003] In such a conventional means, since the elastic pressure of the wave washer 14 is constant, the rotation moment increases due to a change in the center of gravity of the door 1 when the door 1 is rotated. Unless a shock absorber such as a shock absorber is provided, the door may turn rapidly and a large impact may occur. Accordingly, the present invention provides a state in which the elastic force of the spring automatically increases with an increase in the rotational moment due to the movement of the center of gravity when the rotary member rotates, thereby providing the rotary member with an appropriate cushioning property. The main object of the present invention is to provide a bearing structure which can be smoothly rotated by using the same structural members as the conventional structure at low cost. [0005] To achieve the above object, the present invention takes the following technical measures. That is, in the present invention, the shaft 2 fixed to the rotating member 1 and the shaft 2
And a bearing member 3 rotatably supporting the shaft member. The bearing member 3 is slidably mounted only on a fixed machine frame 4 and further, the shaft 2 or a portion connected thereto with respect to a shaft center. A first inclined cam surface 5 is provided on a vertical surface, and the bearing member 3 is opposed to the inclined cam surface 5.
Is provided with a second inclined cam surface 6, and these inclined cam surfaces 5 and 6 are configured to be constantly urged by a spring 7 in a direction of approaching. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below based on an embodiment shown in the drawings. 1 and 2 show a first embodiment of a bearing structure according to the present invention, in which a shaft 2 fixed to a rotating member 1 such as a door, and a bearing member rotatably supporting the shaft 2 are shown. 3 is included. The bearing member 3 is attached to a fixed machine frame 4 such as a chassis via an outer cylinder 8 so as to be slidable only by a predetermined stroke. Further, the shaft 2
The first inclined cam surface 5 is provided on a surface perpendicular to the axis at the base end large diameter portion, and the bearing member 3 has a second inclined cam surface 6 facing the inclined cam surface 5. Is provided. These inclined cam surfaces 5 and 6 are urged by a spring 7 in a direction in which they are always close to each other. In this embodiment, the spring 7 is formed of a wave washer having a spring property, and a flange 9 of a screw 9 screwed into the shaft core from the end surface of the shaft 2.
a and the outer end surface of the bearing member 3. Therefore, when the rotating member 1 rotates from the state shown in FIG. 1, the inclined cam surface 6 of the bearing member 3 is pushed by the first inclined cam surface 5 on the rotating member side, as shown in FIG. It moves in the middle right direction to compress the spring 7. The repulsive force of the spring 7 operates as a brake, and the rapid rotation of the rotating member 1 can be suppressed. That is, the elastic force of the spring 7 automatically increases with an increase in the rotational moment due to the movement of the center of gravity of the rotating member 1, and it is possible to suppress a rapid rotation of the rotating member. By selecting the inclination angles of the inclined cam surfaces 5 and 6 and the resilient pressure of the spring 7, a desired rotation suppressing force can be obtained. FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, a second inclined cam surface 6 is provided on an outer end surface of a bearing member 3. And
A cam disc 10 is fixed to the exposed front end side of the shaft 2 with screws 9, and the cam disc 10 is provided with a first inclined cam face 5 facing the inclined cam face 6. The spring 7 uses a coil spring, and is installed so as to constantly urge the rear surface of the bearing member 3 toward the first cam surface 5. Therefore, also in this embodiment, as shown in FIG. 4, the rotation of the rotating member 1 causes the inclined cam surface 6 of the bearing member 3 to be pushed and moved by the first inclined cam surface 5 of the cam disk 10 to compress the spring 7. . Here, the repulsive force of the spring 7 operates as a brake, and it is possible to suppress rapid rotation of the rotating member 1. Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments . In addition the present invention of that with the configuration requirements, and to achieve the object of the present invention, in which can be carried out appropriately modified within a range that the following effects. According to the present invention, the elastic force of the spring automatically increases as the rotational moment increases due to the movement of the center of gravity when the rotating member rotates. As a result, the rapid rotation of the rotating member can be suppressed,
As a result, it is possible to prevent the occurrence of an impact or the like beforehand and to rotate smoothly, and it is possible to form with the same components as the conventional one without adding a special member in the structure. There is an excellent effect that it can be manufactured at a low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first embodiment of a bearing structure according to the present invention. FIG. 2 is a sectional view showing the operation of the bearing structure. FIG. 3 is a sectional view showing a second embodiment of the bearing structure according to the present invention. FIG. 4 is a sectional view showing the operation of the bearing structure. FIG. 5 is a sectional view showing a conventional structure. [Description of Signs] 1 Rotating member 2 Shaft 3 Bearing member 4 Fixed machine frame 5 First inclined cam surface 6 Second inclined cam surface 7 Spring

Claims (1)

(57) [Claim 1] It comprises a shaft fixed to a rotating member and a bearing member rotatably supporting the shaft, and the bearing member slides only with respect to the fixed machine frame. It mounted freely, further, the first inclined cam surface is provided on the shaft or part minute continuous thereto, and a second inclined cam surface on said bearing member relative to said inclined cam surface is provided cage, these inclined cam surface is biased in a direction toward constantly by a spring, provisions to form a predetermined tilt angle with a plane perpendicular to the first inclined cam surface and the axis, wherein First inclination
A bearing structure in which the inclined cam surface has a shape cut at the predetermined inclination angle .