JPH0524818Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a bearing device that elastically supports and automatically aligns a valve shaft, for example.

BACKGROUND TECHNOLOGY As a conventional bearing device of this kind, for example,
As shown in the figure, a device applied to the intake system of a four-cylinder internal combustion engine is known (for example,
(See Publication No. 180736).

To explain the outline, 1 is the throttle body, 2
are the four intake passages 3 in the throttle body 1...
These throttle valves 2 are butterfly-type throttle valves arranged respectively in...
It is fixed via a mounting bolt 5 to a relatively long throttle shaft 4 inserted transversely into the throttle body 1. The throttle shaft 4 is supported in five bearing holes 6 in the throttle body 1 with a predetermined clearance C.

Therefore, for example, as in the technology described in Japanese Patent Publication No. 14243/1973 and Japanese Utility Model Application Publication No. 51042/1983,
Although there are also models in which the shaft is elastically supported with respect to the bearing hole by an elastic member and a cylindrical member, the former cannot restrict the free movement of the inner cylindrical member in the axial direction within the elastic member. , the elastic member and the cylindrical member cannot be integrated, making it impossible to stably and reliably support the shaft. Furthermore, in the latter case, even if the free movement can be restricted by a stopper, the stopper is separate from the elastic member, which not only complicates the structure, but also reduces manufacturing workability and costs. prices have been forced to rise.

Means for Solving the Problems The present invention has been devised in view of the above-mentioned conventional problems. In the bearing device, the elastic support has a plurality of protrusions that come into elastic contact with the circumferential surface, and a cylindrical member that rotatably supports the shaft on the inner circumference is held inside the elastic support, wherein the elastic support has a cylindrical portion. The inner circumferential surface of the cylindrical member is formed to have an arcuate cross-section, and the inner circumferential surface supports the cylindrical member with clamping pressure in a state of surface contact, and a stopper is integrally provided at the end portion of the cylindrical member to restrict movement of the cylindrical member in the axial direction. It is characterized by the fact that it has been established.

Effects According to the present invention having the above configuration, the shaft can not only be elastically supported by the elastic support body and the cylindrical member, but also sufficiently supported by supporting the cylindrical member in surface contact with the inner peripheral surface of the cylindrical part. A contact friction force can be obtained. Therefore, the cylindrical member and the shaft can be supported stably and reliably.

Moreover, the free movement of the cylindrical member in the axial direction is restricted by the stopper, and together with the supporting action of the surface contact, the integration with the elastic support body is promoted. Further, since the stopper can be molded together with the elastic support by press working or the like, molding workability is facilitated and costs can be reduced.

Embodiments Hereinafter, embodiments of this invention will be described in detail based on the drawings.

1 and 2 are partial cross-sectional views showing one embodiment of a bearing device according to this invention, and FIG. 3 is a schematic view of this embodiment applied to an intake system of a four-cylinder internal combustion engine, similar to the above-mentioned conventional one. It is a diagram.

In Fig. 3, 1 is the throttle body, 2 is a butterfly-type throttle valve that opens and closes the four intake passages 3 in the throttle body 1 to determine the intake flow rate, and 6 connects the intake passages 3 from the side. A relatively large-diameter bearing hole 4 is inserted into the bearing hole 6, and each throttle valve 2 is fixed through a mounting bolt 5. The throttle shaft 4 is supported by bearing devices disposed in the bearing holes 6, respectively.

As shown in FIGS. 1 and 2, the bearing device includes a substantially cylindrical elastic support 11 made of metal, and a cylindrical member 1 held inside the elastic support 11.
It is composed of 2. The elastic support 11
The cylindrical portion 11a is formed to have an arcuate cross section, and three protrusions curved in the circumferential direction are provided on the outer periphery of the cylindrical portion 11a at equal intervals in the circumferential direction and at equal intervals in the outer radial direction. portions 13... are formed along the axial direction, and the radial dimension R from the center X of the elastic support 11 to the apex P of each protrusion 13... is slightly smaller than the radial dimension of the bearing hole 6. is set to a large value. Further, in the elastic support 11, elongated holes 14 extending along the circumferential direction are formed in respective recesses between the protrusions 13 on both ends, and the outside of each of the elongated holes 14 is formed. Three stopper portions 15 each bulging inwardly in a curved manner are formed on the end sides.

Further, the cylindrical member 12 is in surface contact with the inner circumferential surface of the cylindrical portion 11a of the elastic support 11 and is held under clamping pressure, and is also rotated in the thrust direction by the stopper portions 15. (axial direction) movement is restricted.

Each of the elastic supports 11 is crimped and fixed to three points on the circumferential surface 6a of the bearing hole 6 via each protrusion 13, and the throttle shaft 4 is mounted inside each cylindrical member 12 on the inner periphery. It is rotatably supported on the surface 12a.

Therefore, according to this embodiment, the throttle shaft 4 includes the cylindrical member 12 and the elastic support 11.
Because it is elastically supported in the bearing hole 6 by
Even if there is a slight bend due to a centering error of the throttle shaft 4, it will be automatically aligned. In other words, there is no need for clearance to directly bearing the throttle shaft in the bearing hole as in the past, and therefore high precision machining is not required when centering the throttle shaft 4 or drilling the bearing hole 6. . As a result, manufacturing costs can be reduced, and interference noise caused by vibrations between the throttle shaft 4 and the bearing hole 6 can be completely prevented. Moreover, since the throttle shaft 4 is elastically supported, the coating layer on the outer periphery of the throttle shaft 4 does not peel off, and the sliding property with respect to the support member is improved. In addition, by supporting the cylindrical member 12 in surface contact with the inner circumferential surface of the cylindrical portion 11a and in a clamping state, sufficient contact frictional force is obtained, so that the cylindrical member 12 can be supported stably and reliably. As a result, the elastic support 11 and the cylindrical member can be integrated, and thereby even if vibration is transmitted from the throttle body, interference noise etc. due to vibration between the two 11 and 12 can be prevented from occurring. .

Further, the free movement of the cylindrical member 12 in the thrust direction (axial direction) is restricted by the stoppers 15, 15 integrally provided at both ends of the elastic support 11, so that the above-mentioned surface contact and clamping pressure support effects are prevented. Together with this, integration with the elastic support 11 is facilitated.

Furthermore, since the stoppers 15, 15 can be molded together when pressing the elastic support 11, the overall molding operation becomes extremely easy and the manufacturing cost can be reduced.

In the above embodiment, three protrusions 13... of the elastic support body 11 are formed, but depending on the strength conditions, it is possible to form more than three protrusions 13 for multi-point support.

Effects of the invention As is clear from the above explanation, according to the bearing device according to the invention, since the shaft is elastically supported by the elastic support, there is no need for a high-precision clearance between the bearing hole and the shaft. In addition to achieving good manufacturing workability and reducing costs, in particular, by supporting the cylindrical member in surface contact with the inner circumferential surface of the cylindrical part, which has an arcuate cross section, sufficient contact can be achieved. A frictional force is obtained, which allows the two to be integrated. Therefore, the shaft can be stably and reliably supported by the elastic support.

Moreover, the cylindrical member is prevented from freely moving in the axial direction by the stopper of the elastic support, thereby further promoting integration with the elastic support. As a result, even if vibrations are transmitted from the outside, interference noise between the two is reliably prevented from occurring due to the vibrations.

Furthermore, since the stopper can be molded together with the elastic support by press molding or the like, the overall molding operation is facilitated from this point of view as well, and costs can be reduced.

Incidentally, although the above embodiments have been shown to be applied to an intake system of an internal combustion engine, the present invention is not limited thereto and can be applied to various types of bearings.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of a bearing device according to this invention, Fig. 2 is a view taken from the direction of arrow A in Fig. 1, and Fig. 3 shows this embodiment applied to an intake system of an internal combustion engine. FIG. 4 is a sectional view showing a conventional bearing device. 4...Throttle shaft (shaft), 6...
...Bearing hole, 6a...Surrounding surface, 11...Elastic support body,
11a... Cylindrical part, 12... Cylindrical member, 12a...
Inner peripheral surface, 13... protrusion, 15... stopper.

Claims (1)

[Scope of utility model registration request] A substantially cylindrical elastic support mounted in the bearing hole has a plurality of protrusions on the outer periphery thereof that come into elastic contact with the inner peripheral surface of the bearing hole, and inside the elastic support,
In a bearing device that holds a cylindrical member that rotatably supports a shaft on an inner circumferential surface, the elastic support body has an inner circumferential surface of the cylindrical portion having an arcuate cross section, and the elastic support body supports the cylindrical member on the inner circumferential surface. What is claimed is: 1. A bearing device, characterized in that the cylindrical member is supported with clamping pressure in a state of surface contact, and is integrally provided with a stopper at an end portion for regulating movement of the cylindrical member in the axial direction.