Thin-wall ball bearing

Abstract

A thin-wall ball bearing comprises an outer ring, an inner ring and a dustproof cover, a roller path is arranged between the outer ring and the inner ring, outer sealing grooves matched with the dustproof cover to form sealing are formed in the positions, located on the two sides of the roller path, of the outer ring, the end, close to the outer sealing grooves, of the dustproof cover is a first contact part, and the first contact part is obliquely arranged before entering the roller path; the outer sealing groove is concavely arranged towards the outer diameter direction of the outer ring, a first contact point and a second contact point are formed at the two ends of the outer sealing groove, the outer sealing groove and the dustproof cover form contact sealing only through the first contact point and the second contact point, and the inclination angle of the first contact part is increased after the first contact part forms contact sealing with the first contact point and the second contact point. The utility model has the beneficial effects that the inner part of the concave outer sealing groove does not need to be processed at high precision, so that the processing difficulty and the production cost are reduced; meanwhile, due to the inclination angle of the first contact part, the press-fitting torque is reduced, and the outer ring is prevented from being deformed due to the fact that the outer ring bears too large press-fitting torque.

Description

Technical Field

[0001] The utility model relates to a transmission device, in particular to a thin-walled ball bearing. Background Art

[0002] Thin-walled ball bearings are high-precision, low-friction bearings that are particularly suitable for applications where space is limited and high-speed rotation is required. The characteristics of this type of bearing are that its outer and inner rings have very thin wall thickness, and the rolling elements are usually small-diameter steel balls. In thin-walled ball bearings, the design of the dust cover is crucial. After being placed inside the bearing, it is radially pressed between the outer and inner rings of the bearing to form an effective seal. This sealing structure not only prevents the intrusion of dust, moisture and other contaminants, extending the service life of the bearing, but also reduces the risk of bearing damage caused by contamination. The tight fit of the dust cover also helps to maintain the lubrication state inside the bearing, ensuring that the bearing can operate stably under various working conditions.

[0003] like Figure 1 Provided is an existing thin-walled ball bearing, in which a dust cover is arranged in a straight line near a sealing groove of an outer ring before press-fitting, and after being placed between the inner and outer rings of the bearing, the straight end of the dust cover is initially bent due to the compression of the sealing groove arranged on the outer ring. Then, pressure is applied in the radial direction of the outer ring to press-fit the straight end of the dust cover into a hook shape, thereby completing the installation of the dust cover.

[0004] In order to form a stable seal, the dust cover of the prior art must be hooked on the side close to the outer ring. However, in order to press the straight end of the dust cover into a hook shape, a large press force must be applied during radial press fitting. Therefore, the above scheme has the problem of large torque required for press fitting, which in turn causes the outer ring to be easily deformed or it is difficult to ensure that the dust cover is pressed in place. At the same time, in order to ensure that the straight end of the dust cover can form a hook shape during the press fitting process, the sealing groove of the outer ring must always fit on the dust cover during the press fitting process, which not only makes the processing difficulty of the bearing outer ring greater, but also easily causes the dust cover to be worn during the press fitting process due to insufficient processing accuracy of the outer ring, resulting in sealing failure. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a thin-walled ball bearing which is convenient for radial press-fitting of a dust cover.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a thin-walled ball bearing, comprising an outer ring, an inner ring and a dust cover, a raceway is provided between the outer ring and the inner ring, and outer sealing grooves are provided on both sides of the raceway on the outer ring, which cooperate with the dust cover to form a seal, and the end of the dust cover close to the outer sealing groove is a first contact portion, and the first contact portion is inclined before entering the raceway, and the outer sealing groove is concave toward the outer diameter direction of the outer ring and forms a first contact point and a second contact point at both ends of the outer sealing groove, and the outer sealing groove and the dust cover form a contact seal only through the first contact point and the second contact point, and the inclination angle of the first contact portion after forming a contact seal with the first contact point and the second contact point is greater than the inclination angle before entering the raceway.

[0007] The beneficial effects of the utility model are as follows: since the first contact portion of the dust cover itself has a certain tilt angle and the tilt angle is preferably tilted from the end close to the inner side of the raceway toward the end close to the outer side of the raceway in terms of its installation direction, that is, the outer diameter surface of the outer ring can play a pre-pressing effect when installed in the raceway, so as to facilitate the subsequent press-fitting of the dust cover. The outer sealing groove forms a contact seal with the dust cover only through the first contact point and the second contact point, so that other parts of the outer sealing groove will not form contact with the dust cover during the press-fitting process, so the inner concave outer sealing groove does not need high-precision processing, thereby reducing the processing difficulty and production cost; at the same time, due to the tilt angle of the first contact portion itself, the required press-fitting distance can be reduced, thereby reducing the press-fitting torque, so as to avoid the outer ring from being deformed due to excessive radial press-fitting torque.

[0008] Furthermore, inner sealing grooves are provided on both sides of the raceway of the inner ring, and the dust cover is provided with a second contact portion at one end close to the inner sealing groove. The second contact portion is L-shaped and its end close to the inner sealing groove is parallel to the outer diameter of the inner ring. There is a gap between the second contact portion and the inner sealing groove before radial pressing.

[0009] A gap is left between the second contact portion and the inner sealing groove to prevent the dust cover from being deformed on the side close to the inner ring, i.e., the second contact portion, during the press-fitting process; similarly, the second contact portion, whose end close to the inner sealing groove is parallel to the outer diameter surface of the inner ring, prevents the dust cover from being deformed by increasing the contact area with the inner ring after press-fitting.

[0010] Furthermore, the first contact portion includes a press-fit arm, a limiting arm and a connecting arm, the press-fit arm is inclined and its two ends are respectively in contact with the first contact point and the second contact point; the limiting arm has a longitudinal cross-section, and a supporting surface is provided on the outer ring, and the supporting surface extends from one end of the outer sealing groove close to the inner side of the raceway toward the inner ring and cooperates with the limiting arm to abut against the first contact portion; the first contact portion is spoon-shaped and is formed with a recessed portion located at the limiting arm in the direction toward the outer side of the raceway.

[0011] The first contact portion is spoon-shaped and its recess is located at the limiting arm, which can facilitate the automatic assembly of the dust cover in the present invention, that is, it provides a practical position for the tool that presses the dust cover into the raceway, and because the outer ring is provided with an abutment surface that abuts against the limiting arm, the automatic assembly can identify whether the installation is in place through pressure changes, thereby facilitating the automatic assembly of the dust cover in the present invention to improve production efficiency.

[0012] Furthermore, the outer ring is provided with a guide surface connected to the outer sealing groove, and the guide surface is inclined at one end located at the edge of the outer ring toward the end of the outer sealing groove close to the outer side of the raceway, and the inclination increases the inclination angle of the press-fitting arm during the process of the press-fitting arm being installed into the raceway.

[0013] The guide surface in the above scheme can not only guide the installation of the dust cover, but also play a pre-pressing effect, thereby further reducing the torque required for radial press fitting, so that the outer ring of this scheme is less likely to deform during radial press fitting.

[0014] Furthermore, a force application groove is provided on the outer diameter surface of the outer ring, and the position of the force application groove on the outer diameter surface of the outer ring is arranged correspondingly to the position of the outer sealing groove on the inner diameter surface of the outer ring.

[0015] The radial press-fitting head can cooperate with the force-applying groove in the above solution to more easily transmit the radial press-fitting force to the dust cover, so as to facilitate the press-fitting of the dust cover and thus improve the press-fitting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial cross-sectional view of the dust cover of the prior art;

[0017] Figure 2 A cross-sectional view of an embodiment of the utility model;

[0018] Figure 3 It is a partial enlarged view of the first contact portion of the embodiment of the utility model;

[0019] Figure 4 It is a partial enlarged view of the second contact portion of the embodiment of the utility model;

[0020] Figure 5 It is a partial enlarged view of the outer ring of the embodiment of the utility model. DETAILED DESCRIPTION

[0021] The utility model embodiment of a thin-walled ball bearing such as Figure 1-5As shown, it includes an outer ring 1, an inner ring 2 and a dust cover 4. A raceway 3 for rolling elements is provided between the outer ring 1 and the inner ring 2. The outer ring 1 is provided with outer sealing grooves 11 located on both sides of the raceway 3. Similarly, the inner ring 2 is provided with inner sealing grooves 21 located on both sides of the raceway 3. There are two dust covers 4, which are located on both sides of the raceway 3 respectively.

[0022] The dust cover 4 includes a first contact portion 41 close to the outer ring 1 and a second contact portion 42 close to the inner ring 2. The second contact portion 42 has an L-shaped cross section and the end of the second contact portion 42 close to the inner ring 2 is parallel to the outer diameter surface of the inner ring 2. The first contact portion 41 is composed of a press-fit arm 411, a limit arm 412 and a connecting arm 413, and the three are connected to form a spoon shape. After the three are connected, a recess 414 is formed at the end of the first contact portion 41 facing the outer side of the raceway, and the position of the recess 414 corresponds to the limit arm 412. Before the dust cover 4 is installed in the raceway 3, its press-fit arm 411 is inclined and the inclination direction is inclined from the direction close to the raceway 3 to the direction away from the raceway 3.

[0023] The outer sealing groove 11 is concave and has two ends, a first contact point 111 close to the outer side of the raceway 3 and a second contact point 112 close to the inner side of the raceway 3. The outer ring 1 is also provided with a guide surface 13 connected to the first contact point 111 and abutment surface 12 connected to the second contact point 112. The abutment surface 12 has a longitudinal cross section and is used to form abutment contact with the limit arm 412. The guide surface 13 is inclined and the inclined setting makes the guide surface 13 from the end connected to the first contact point 111 toward the edge of the outer ring 1, so that the inner diameter of the outer ring 1 is continuously reduced. At the same time, a force application groove 14 is provided on the outer ring 1 to facilitate the radial press tool to apply force. The force application groove 14 corresponds to the position of the outer sealing groove 11 in the cross section.

[0024] The installation process of this embodiment is briefly described as follows: first, the dust cover 4 is installed into the raceway 3 through the position of the recess 414 of the first contact portion 41 corresponding to the pressing tool. At this time, due to the force of the pressing tool acting on the recess 414 and the movement of the pressing arm 411 along the guide surface 13, the pressing arm 411 can be effectively pre-pressed when installed into the raceway 3 and finally form abutment with the first contact point 111 and the second contact point 112 of the outer sealing groove 11; after the dust cover 4 is installed into the raceway 3, a radial pressing force is applied to the outer ring 1, and at this time the radial pressing tool can only cooperate with the force groove 14 so that the first contact portion 41 abutting against the first contact point 111 and the second contact point 112 is deformed, so that the pressing arm 411 is deformed and a contact seal is formed between the first contact point 111 and the second contact point 112.

[0025] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A thin-walled ball bearing, comprising an outer ring, an inner ring and a dust cover, a raceway is provided between the outer ring and the inner ring, and outer sealing grooves are provided on both sides of the raceway on the outer ring to cooperate with the dust cover to form a seal, characterized in that: One end of the dust cover close to the outer sealing groove is a first contact portion, and the first contact portion is inclined before entering the raceway. The outer sealing groove is concave toward the outer diameter direction of the outer ring and forms a first contact point and a second contact point at both ends of the outer sealing groove. The outer sealing groove and the dust cover form a contact seal only through the first contact point and the second contact point. After the first contact portion forms a contact seal with the first contact point and the second contact point, its inclination angle is greater than the inclination angle before entering the raceway.

2. The thin-walled ball bearing according to claim 1, characterized in that: The inner ring is provided with inner sealing grooves on both sides of the raceway, the dust cover is provided with a second contact portion at one end close to the inner sealing groove, the second contact portion is L-shaped and its end close to the inner sealing groove is parallel to the outer diameter of the inner ring, and there is a gap between the second contact portion and the inner sealing groove before radial press-fitting.

3. The thin-walled ball bearing according to claim 1, characterized in that: The first contact portion includes a press-fit arm, a limit arm and a connecting arm, the press-fit arm is inclined and its two ends are respectively in contact with the first contact point and the second contact point; the limit arm has a longitudinal cross-section, and a supporting surface is provided on the outer ring, and the supporting surface extends from one end of the outer sealing groove close to the inner side of the raceway toward the inner ring and cooperates with the limit arm to abut; the first contact portion is spoon-shaped and has a recessed portion located at the limit arm in the direction toward the outer side of the raceway.

4. The thin-walled ball bearing according to claim 3, characterized in that: The outer ring is provided with a guide surface connected to the outer sealing groove. The guide surface is inclined at one end located at the edge of the outer ring toward the end of the outer sealing groove close to the outer side of the raceway, and the inclination increases the inclination angle of the press-fitting arm during the process of the press-fitting arm being installed into the raceway.

5. The thin-walled ball bearing according to claim 1, characterized in that: A force application groove is provided on the outer diameter surface of the outer ring, and the position of the force application groove on the outer diameter surface of the outer ring is corresponding to the position of the outer sealing groove on the inner diameter surface of the outer ring.

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