CN110273918A - A kind of capacity eccentric bearing with oriented structure - Google Patents

Abstract

The invention relates to an eccentric bearing with an orientation structure, which is applied to the transmission part of small and micro machines. It includes an inner ring body, a rolling body, and an outer ring body from the inside to the outside. The inner ring body is provided with an eccentric hole, and the central axis of the eccentric hole deviates from the central axis of the inner ring body. It is characterized in that the eccentric hole is provided with The positioning platform, the eccentric hole is composed of a section of arc-shaped curved surface and a section of plane, and the section of plane constitutes the positioning platform. The present invention directly drills holes on the basis of miniature or small bearings, which is easy to process and low in cost; and the hole has a plane hole, which cooperates with a shaft of a specific structure to form an eccentric transmission and limit the shaft itself and the shaft connected to the shaft. Rotation of other structures.

Description

An Eccentric Bearing with Directional Structure

technical field

The invention belongs to a bearing mechanism, in particular to an eccentric bearing with an orientation structure, which is applied to the transmission part of small and micro machines.

Background technique

Eccentric transmission in large or medium-sized machines is mainly accomplished by eccentric bearings, which are generally composed of multiple large bearing rings and small bearing rings, or eccentric keyways are provided on the bearings. In small and micro machines, due to the limitation of space and structure, only a single bearing can be used, and the volume of the bearing is very small, and it is impossible to perform detailed and complicated drilling, turning and milling, etc. The structure similar to the keyway is not easy in Machined on miniature bearings.

Contents of the invention

The present invention mainly aims at the problem that the eccentric bearings of miniature and small machines are not easy to process and produce, and has invented an eccentric bearing with a directional structure, which is directly drilled on the basis of miniature or small bearings, and the shape of the holes is not circular, but has A flat hole, matched with a shaft of a specific structure, can not only form an eccentric transmission, but also limit the rotation of the shaft itself and other structures connected to the shaft, and the production process is relatively simple and the cost is low.

The above-mentioned technical problem of the present invention is implemented through the following technical solutions: an eccentric bearing with a directional structure, which includes an inner ring body, a rolling body, and an outer ring body from the inside to the outside, and the inner ring body is provided with an eccentric hole, The central axis of the eccentric hole deviates from the central axis of the inner ring body. It is characterized in that the eccentric hole is provided with a positioning platform, and the eccentric hole is composed of a section of arc-shaped curved surface and a section of plane, and the section of plane forms the positioning platform. In practical applications, a transmission shaft with a matching cross-section is used, and the transmission shaft itself will not rotate when it rotates eccentrically, thereby limiting the rotation of other structural components connected to the transmission shaft.

Preferably, the positioning platform is located on a side close to the edge of the inner ring body, and the arc-shaped curved surface is located on a side close to the center of the inner ring body, so the distance between the positioning platform and the edge of the inner ring body is not the minimum distance, Conversely, if the positioning platform is close to the center of the inner ring body and the arc-shaped surface is close to the edge of the inner ring body, the minimum distance between the arc-shaped surface and the edge of the inner ring body will become The weakest position of the entire eccentric bearing, meanwhile, reduces the strength of the entire eccentric bearing.

The entire eccentric hole is roughly located in the half area of the inner ring body, and the positioning platform is closer to the edge of the inner ring body and away from the center of the inner ring body; the center of the eccentric hole is roughly half of the radius of the inner ring body.

In large or medium-sized machines, an eccentric hole combined with a round hole and a keyway is used. The processing of this kind of hole requires multiple processes of drilling, milling, and grinding, which cannot be easily realized in the processing of miniature or small bearings; In other words, the shape of the hole proposed by the present invention is easy to process and low in cost under the limited conditions of miniature or small size.

Preferably, the line connecting the center of the inner ring body and the center of the eccentric hole is perpendicular to the positioning platform, and the vertical foot is located on the center line of the positioning platform.

As a preference, the central angle of the arc formed by the arc-shaped curved surface of the eccentric hole is 180°-315°; if the area of the positioning platform is too small, the limiting effect of the positioning platform on the shaft will be insufficient, which will affect the orientation effect ; If the area of the positioning platform is too large, the thickness of the shaft will be limited, which will affect the firmness of the shaft.

Preferably, a ring cage is arranged between the inner ring body of the bearing and the outer ring body of the bearing, and several spacer rings for isolating rolling elements are evenly spaced on the cage, and a rolling body is arranged in each spacer ring.

Preferably, each rolling body is in contact with the outer wall surface of the bearing inner ring body, and at the same time, each rolling body is in contact with the inner wall surface of the bearing outer ring body.

Preferably, the rolling elements are configured as spherical balls or cylindrical rollers.

Preferably, between the inner ring body and the outer ring body and on both sides of the rolling elements are respectively covered with a ring of dust-proof rings, so as to prevent external dust or foreign matter from entering the bearing, which will wear the bearing or hinder the normal operation of the bearing.

In summary, compared with the prior art, the present invention has the following advantages:

The present invention is suitable for miniature or small machines. As the main structure of eccentric transmission, a hole is directly drilled on the basis of a single bearing. The formation of eccentric transmission can also limit the rotation of the shaft itself and other structures connected to the shaft; the hole of the present invention has a simpler processing technology and low cost; compared with an eccentric circular hole on a single bearing, the hole of the present invention And the position of the hole is more conducive to enhancing the strength of the shaft core of the entire bearing, avoiding weak positions of the bearing, and improving the strength of the bearing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a partial sectional view of the present invention

Fig. 3 is a sectional view of the present invention.

The labels in the figure are: 1. Inner ring body; 2. Rolling body; 3. Outer ring body; 4. Eccentric hole; 5. Positioning platform; 6. Cage; 7. Dustproof ring.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1:

As shown in Figures 1, 2, and 3, an eccentric bearing with a directional structure, from the inside to the outside, is respectively: a cylindrical inner ring body 1, a circle of rolling elements 2, and a cylindrical outer ring body 3 .

There is a cage 6 between the inner ring body 1 of the bearing and the outer ring body 3 of the bearing. A plurality of isolation rings for isolating the rolling elements 2 are evenly spaced on the cage 6, and a rolling element is placed in each isolation ring. The body 2; the rolling body 2 can specifically be set as a spherical ball or a cylindrical roller.

Each rolling body 2 conflicts with the outer wall surface of the inner ring body 1 of the bearing, and at the same time, each rolling body 2 conflicts with the inner wall surface of the outer ring body 3 of the bearing.

Between the inner ring body 1 and the outer ring body 3 and on both sides of the rolling body 2 are respectively covered with a ring of dust-proof rings 7 , as shown in FIG. 3 .

There is an eccentric hole 4 axially penetrating through one half of the inner ring body 1. The eccentric hole 4 deviates from the center of the inner ring body 1. Specifically, it means that the central axis of the eccentric hole 4 deviates from the central axis of the inner ring body 1, and the two are parallel. And the spacing is between one-third and one-half of the radius of the inner ring body 1 .

The eccentric hole 4 has a positioning platform 5, and the eccentric hole 4 is composed of a section of arc-shaped curved surface and a section of plane, and this section of flat surface constitutes the described positioning platform 5; Between one-third and one-half, and the central angle subtended by the arc formed by the arc-shaped curved surface is 180°-315°, specifically 180°, 240°, or 300°.

The positioning platform 5 is located on the side near the edge of the inner ring body 1, and the arc-shaped curved surface is located on the side near the center of the inner ring body 1; the line connecting the center of the inner ring body 1 and the center of the eccentric hole 4 is perpendicular to the The positioning platform 5, and the vertical foot is located on the center line of the positioning platform 5.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (8)

1. An eccentric bearing with a directional structure, which includes an inner ring body (1), a rolling body (2), and an outer ring body (3) from inside to outside. The inner ring body is provided with an eccentric hole (4), and the eccentric The central axis of the hole deviates from the central axis of the inner ring body. It is characterized in that the eccentric hole is provided with a positioning platform (5). The eccentric hole is composed of a section of arc-shaped curved surface and a section of plane, and the section of plane constitutes the positioning platform. . 2. The eccentric bearing with directional structure according to claim 1, wherein the positioning platform is located on a side close to the edge of the inner ring body, and the arc-shaped curved surface is located on a side close to the center of the inner ring body. 3. The eccentric bearing with directional structure according to claim 1, characterized in that, the line connecting the center of the inner ring body and the center of the eccentric hole is perpendicular to the positioning platform, and the vertical foot is located at the center of the positioning platform on-line. 4. The eccentric bearing with directional structure according to claim 1, characterized in that, the central angle of the arc formed by the arc-shaped curved surface of the eccentric hole is 180°-315°. 5. The eccentric bearing with directional structure according to any one of claims 1 to 4, characterized in that, a cage (6) is arranged between the inner ring body of the bearing and the outer ring body of the bearing, and on the cage A plurality of isolation rings for isolating the rolling elements are evenly spaced, and a rolling element is arranged in each isolation ring. 6 . The eccentric bearing with directional structure according to claim 5 , wherein each rolling element interferes with the outer wall surface of the bearing inner ring body, and at the same time, each rolling element interferes with the inner wall surface of the bearing outer ring body. 7. The eccentric bearing with directional structure according to claim 6, characterized in that, the rolling elements are set as spherical balls or cylindrical rollers. 8. The eccentric bearing with directional structure according to claim 5, characterized in that, between the inner ring body and the outer ring body and on both sides of the rolling elements are respectively covered with a ring of dust-proof rings (7).