Cam follower needle roller bearings for punch press spindles

Abstract

The present invention provides a cam follower needle roller bearing for a punch press spindle, comprising an outer ring, an inner ring, and a plurality of needle rollers. A raceway for the needle rollers is formed between the outer ring and the inner ring, and the plurality of needle rollers are fully loaded in the raceway. The inner ring is provided with retaining rings located on both axial sides of the needle rollers, and the retaining rings are capable of abutting against the ends of the needle rollers to form a limit. Mounting grooves are defined at both ends of the outer ring. The outer diameter of the retaining ring extends into the mounting groove, and both its outer diameter and axial end face are spaced from the inner wall of the mounting groove. A sealing ring with a sealing lip is provided between the mounting groove and the retaining ring, and the sealing lip forms an interference fit with the inner wall of the mounting groove and the retaining ring. In response to the shortcomings of the prior art, the present invention provides a cam follower needle roller bearing having large rated dynamic and static loads, capable of withstanding large impact loads, and having a protective structure.

Description

Technical Field

[0001] The present invention relates to a cam follower needle roller bearing. Background Art

[0002] Needle roller bearings are rolling bearings with slender cylindrical rollers. Their main features are small cross-sectional diameter and strong load-bearing capacity. They are mainly used in relatively compact equipment structures. Cam follower needle roller bearings are also called cam bearing followers. Their outer ring is connected to the wheel surface or directly serves as the wheel surface, and their inner ring is connected to the wheel axle. Therefore, during operation, the outer ring rotates and the inner ring does not move. When used in the main shaft of a punch press, it needs to meet larger rated dynamic loads and rated static loads and be able to withstand larger impact loads. In addition, it is necessary to consider the use environment and set corresponding protective structures to prevent external dust, mud and water from entering the bearing and affecting the service life of the bearing. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a cam follower needle roller bearing, which has a large rated dynamic load and a rated static load, can withstand a large impact load, and has a protective structure.

[0004] To achieve the above-mentioned objectives, the present invention provides a cam follower needle roller bearing for a punch press spindle, comprising an outer ring, an inner ring and a plurality of needle rollers, a raceway for the needle rollers to roll formed between the outer ring and the inner ring, the plurality of needle rollers being fully loaded in the raceway, the inner ring being provided with retaining rings located on both sides of the axial direction of the needle rollers, the retaining rings being capable of abutting against the ends of the needle rollers to form a limit, mounting grooves being provided at both ends of the outer ring, the outer diameter of the retaining ring extending into the mounting groove and the outer diameter and axial end face of the retaining ring being spaced from the inner wall of the mounting groove, and a sealing ring with a sealing lip being provided between the mounting groove and the retaining ring, the sealing lip being in interference fit with the inner wall of the mounting groove and the retaining ring.

[0005] The advantage of adopting the above technical solution is: by fully filling the needle rollers in the raceway and arranging retaining rings on both sides of the axial direction of the needle rollers on the inner ring to cooperate with the positioning of the needle rollers, it is easier to obtain larger rated dynamic loads and rated static loads than the existing technology using balls or needle roller bearings with retainers, and can withstand larger impact loads. Then, a mounting groove is provided on the outer ring and the retaining ring is extended into the mounting groove. Finally, a sealing ring with a sealing lip is provided between the two, and the sealing lip of the sealing ring is in interference fit between the inner wall of the mounting groove and the retaining ring, thereby protecting the inside of the bearing.

[0006] The present invention can be further configured as follows: the outer ring includes a contact surface located between the two mounting grooves, the outer ring forms a raceway with the inner ring through the contact surface, the outer diameter of the needle roller is in contact with the contact surface, and the two ends of the needle roller extend out of the contact surface to the radial extension of the mounting groove, and the two sealing lips are respectively arranged at intervals between the two ends of the needle roller.

[0007] By further setting, a contact surface is provided between the two mounting grooves of the outer ring, and the contact surface is fitted on the outer diameter of the needle roller, so that a part of the two ends of the needle roller extends out of the contact surface to the radial extension of the mounting groove. While the retaining ring spaced apart from the inner wall of the mounting groove forms abutment limit for the needle roller, the retaining ring can also extend into the mounting groove, so that the interval between the mounting groove and the retaining ring can form an L-shaped space, which is convenient for the installation of the sealing lip. Finally, the sealing lip is spaced apart from the two ends of the needle roller, which can avoid wear and interference between the sealing lip and the needle roller.

[0008] The present invention can be further configured as follows: the mounting groove includes a first inner wall, the cross sections of the sealing lip and the first inner wall are radially and vertically extended, and the two ends of the sealing lip are respectively interference-abutted against the first inner wall and the retaining ring.

[0009] Through further configuration, the sealing lip is configured to have a radially extending cross-section. After assembly, the retaining ring can press it against the first inner wall of the mounting groove, thereby ensuring the interference fit between the sealing lip and the first inner wall and the retaining ring, ensuring stability, and also avoiding the influence of external pressure and impact load on the interference fit.

[0010] The present invention can be further configured as follows: the retaining ring includes a first ring groove, an elastic ring sheet and an abutment ring block, the first ring groove is arranged between the end face of the retaining ring facing the needle roller and the outer diameter, the abutment ring block and the elastic ring sheet are both mounted on the first ring groove, and the axial ends of the elastic ring sheet are elastically abutted against the inner wall of the first ring groove and the abutment ring block respectively.

[0011] Through further settings, by arranging a first annular groove between the end face of the retaining ring facing the needle roller and the outer diameter, and arranging an elastic ring sheet and an abutting ring block in the annular groove, the abutting ring block can be elastically pressed against the sealing lip under the action of the elastic ring sheet, so that the interference of the sealing lip is in a dynamic balance. Even if the sealing lip part is worn after long-term operation of the bearing, the interference of the sealing lip can be guaranteed by the abutting ring block, thereby improving the service life of the bearing sealing structure.

[0012] The present invention may be further configured as follows: the sealing ring includes a skeleton made of a rigid material, the skeleton is arranged in the sealing lip, and the cross section of the skeleton is radially extended.

[0013] By further configuring, a frame is provided in the sealing lip of the sealing ring, and the shape of the sealing lip is maintained by the frame, so that the sealing lip can be made of a softer elastic material.

[0014] The present invention can be further configured as follows: the installation groove includes a recessed portion located at the radial extension of the first inner wall; the sealing ring includes a clamping portion located at the outer diameter of the sealing lip; and the clamping portion is embedded in the recessed portion.

[0015] By further arranging, a recess and a clamping portion are respectively provided on the mounting groove and the sealing lip, thereby strengthening the connection between the sealing ring and the outer ring mounting groove.

[0016] The present invention can be further configured as follows: the mounting groove includes a second inner wall, the sealing ring includes an auxiliary lip, the cross-sections of the second inner wall and the auxiliary lip are both axially extended, the second inner wall and the outer diameter of the retaining ring are spaced apart, and the auxiliary lip extends between the second inner wall and the retaining ring and is clearance-fitted with both.

[0017] Through further configuration, an axially extending second inner wall and an auxiliary lip are respectively provided in the mounting groove and on the sealing ring, so that the second inner wall and the outer diameter of the second retaining ring are spaced apart, and the auxiliary lip is extended into the second inner wall to form a clearance fit with the two, so that a certain sealing effect is provided without the auxiliary lip contacting the second inner wall to prevent external dirt from entering; and the gap between the auxiliary lip and the outer diameter of the second retaining ring is provided to provide a certain deformation space for the sealing ring during installation, so as to facilitate the clamping part to be installed in the recess.

[0018] The present invention can be further configured as follows: the inner ring includes a second annular groove located at both axial ends of the inner ring, the retaining ring is sleeved on the second annular groove and abuts against the radially extending inner wall of the second annular groove, and the end faces of the two retaining rings facing outward are flush with the two axial end faces of the inner ring.

[0019] By further setting up second ring grooves at both ends of the inner ring in the axial direction, the retaining ring is sleeved on the second ring groove and abuts against the radially extending inner wall of the second ring groove to form a limit. After the needle rollers are installed into the outer ring and the inner ring, the sealing ring and the retaining ring are successively inserted into the outer ring and the inner ring, which facilitates the installation of the bearing; and the end face of the retaining ring facing outward is flush with the axial end face of the inner ring, so that when the inner ring is finally positioned by the wheel axle, it is convenient for the positioning component on the wheel axle to press the retaining ring into the ring groove.

[0020] The present invention may be further configured as follows: the inner ring includes a clearance groove, and the clearance groove is arranged at the connection between the inner walls on both sides of the second annular groove.

[0021] By further setting up a clearance groove at the connection between the inner walls on both sides of the inner ring corresponding to the second ring groove, it is possible to avoid collision and damage between the corner formed between the end face of the retaining ring and the inner diameter and the second ring groove of the inner ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the internal structure of an embodiment of the present invention;

[0023] Figure 2 For the embodiment of the present invention Figure 1 Enlarged view of part a;

[0024] Figure 3 A perspective view of an embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the sealing ring in an embodiment of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the outer ring in an embodiment of the present invention;

[0027] Figure 6 This is a schematic structural diagram of the inner ring in an embodiment of the present invention;

[0028] Among them: outer ring 1; mounting groove 11; first inner wall 111; recess 112; second inner wall 113; contact surface 12; inner ring 2; second annular groove 21; clearance groove 22; needle roller 3; retaining ring 4; first annular groove 41; elastic ring piece 42; abutting ring block 43; sealing ring 5; sealing lip 51; frame 52; clamping portion 53; auxiliary lip 54. DETAILED DESCRIPTION

[0029] An embodiment of a cam follower needle roller bearing for a punch press spindle according to the present invention is as follows: Figure 1-6 As shown: it includes an outer ring 1, an inner ring 2 and several needle rollers 3, a raceway for the needle rollers to roll is formed between the outer ring 1 and the inner ring 2, and the several needle rollers 3 are fully loaded in the raceway, and the inner ring 2 is provided with retaining rings 4 located on both sides of the axial direction of the needle rollers 3, and the retaining rings 4 can abut against the ends of the needle rollers 3 to form a limit, and mounting grooves 11 are provided at both ends of the outer ring 1, and the outer diameter of the retaining ring 4 extends into the mounting groove 11 and its outer diameter and axial end face are spaced from the inner wall of the mounting groove 11, and a sealing ring 5 with a sealing lip 51 is provided between the mounting groove 11 and the retaining ring 4, and the sealing lip 51 is in interference fit with the inner wall of the mounting groove 11 and the retaining ring 4.

[0030] The outer ring 1 includes a contact surface 12 located between the two mounting grooves 11. The outer ring 1 forms a raceway with the inner ring 2 through the contact surface 12. The outer diameter of the needle roller 3 is in contact with the contact surface 12, and the two ends of the needle roller 3 extend from the contact surface to the radial extension of the mounting groove 11. The two sealing lips 51 are respectively arranged at intervals between the two ends of the needle roller 3.

[0031] The mounting groove 11 includes a first inner wall 111, and the cross-sections of the sealing lip 51 and the first inner wall 111 are radially and vertically extended. The two ends of the sealing lip 51 are respectively interference-abutted on the first inner wall 111 and the retaining ring 4. The sealing ring 5 includes a skeleton 52 made of a rigid material, and the skeleton 52 is arranged in the sealing lip 51, and the cross-section of the skeleton 52 is radially extended. The mounting groove 11 includes a recess 112 located at the radial extension of the first inner wall, and the sealing ring 5 includes a clamping portion 53 located at the outer diameter of the sealing lip 51, and the clamping portion 53 is embedded in the recess 112. The mounting groove 11 includes a second inner wall 113, and the sealing ring 5 includes an auxiliary lip 54. The cross-sections of the second inner wall 113 and the auxiliary lip 54 are It is arranged to extend axially, and the second inner wall 113 and the outer diameter of the retaining ring 4 are arranged at intervals, and the auxiliary lip 54 extends to the space between the second inner wall 113 and the retaining ring 4 and is clearance-matched with both. The skeleton 52 is only in the sealing lip 51 and corresponds to the shape of the sealing lip 51 to ensure the shape of the sealing lip 51, and the auxiliary lip 54 does not contact the outer ring 1. Therefore, no skeleton is provided on the auxiliary lip 54, which can save costs and facilitate the deformation of the clamping portion 53 during installation, making the installation of the sealing ring 5 more convenient, and the overall structure of the sealing ring 5 is relatively simple. During the installation process, the sealing ring 5 and the retaining ring 4 on one side are installed in sequence, and then the needle roller 3 is installed. Finally, the sealing ring 5 and the retaining ring 4 on the other side are installed to complete the assembly. The processing is also relatively simple, which effectively reduces the cost.

[0032] The retaining ring 4 includes a first ring groove 41, an elastic ring piece 42 and an abutting ring block 43. The first ring groove 41 is arranged between the end face of the retaining ring 4 facing the needle roller 3 and the outer diameter. The abutting ring block 43 and the elastic ring piece 42 are both mounted on the first ring groove 41, and the axial ends of the elastic ring piece 42 are elastically abutted against the inner wall of the first ring groove 41 and the abutting ring block 43 respectively. The abutting ring block 43 is pressed against the sealing lip 51 by the elastic force of the elastic ring piece 42 to ensure the interference between the sealing lip 51 and the inner wall of the first ring groove 41 and the abutting ring block 43. Moreover, since this type of bearing is used in the cam follower of the punch press spindle, it is under a high load and low speed state, which can prevent the sealing lip from driving the abutting ring block 43 to rotate, thereby hindering the overall operation.

[0033] The inner ring 2 includes a second annular groove 21 located at both axial ends of the inner ring 2, the retaining ring 4 is mounted on the second annular groove 21 and abuts against the radially extending inner wall of the second annular groove 21, and the end faces of the two retaining rings 4 facing outward are flush with the two axial end faces of the inner ring 2, and the inner ring 2 includes a clearance groove 22, which is arranged at the connection of the inner walls on both sides of the annular groove 21.

[0034] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A cam follower needle roller bearing for a punch press spindle, comprising an outer ring, an inner ring, and a plurality of needle rollers, wherein a raceway for the needle rollers is formed between the outer ring and the inner ring, and characterized in that: The plurality of needle rollers are fully loaded in the raceway, and the inner ring is provided with retaining rings located on both sides of the axial direction of the needle roller, and the retaining rings can abut against the ends of the needle rollers to form a limit, and mounting grooves are provided at both ends of the outer ring, and the outer diameter of the retaining ring extends into the mounting groove, and its outer diameter and axial end face are spaced from the inner wall of the mounting groove, and a sealing ring with a sealing lip is provided between the mounting groove and the retaining ring, and the sealing lip is in interference fit with the inner wall of the mounting groove and the retaining ring, and the outer ring includes a contact surface between the two mounting grooves, and the outer ring forms a raceway with the inner ring through the contact surface, and the outer diameter of the needle roller fits on the contact surface. The two ends of the needle roller extend out of the contact surface to the radial extension of the mounting groove, and the two sealing lips are respectively spaced apart from the two ends of the needle roller. The mounting groove includes a first inner wall, and the cross-sections of the sealing lip and the first inner wall are radially and vertically extended. The two ends of the sealing lip are respectively interference-abutted against the first inner wall and the retaining ring. The retaining ring includes a first annular groove, an elastic ring sheet and an abutting ring block. The first annular groove is arranged between the end face of the retaining ring facing the needle roller and the outer diameter. The abutting ring block and the elastic ring sheet are both fitted in the first annular groove, and the axial ends of the elastic ring sheet are respectively elastically abutted against the inner wall of the first annular groove and the abutting ring block.

2. The cam follower needle roller bearing for a punch press spindle according to claim 1, characterized in that: The sealing ring includes a frame made of a rigid material. The frame is arranged in the sealing lip, and the cross section of the frame is radially extended.

3. The cam follower needle roller bearing for a punch press spindle according to claim 1 or 2, characterized in that: The installation groove includes a recessed portion located at the radial extension of the first inner wall, and the sealing ring includes a clamping portion located at the outer diameter of the sealing lip, and the clamping portion is embedded in the recessed portion.

4. The cam follower needle roller bearing for a punch press spindle according to claim 3, characterized in that: The mounting groove includes a second inner wall, and the sealing ring includes an auxiliary lip. The cross-sections of the second inner wall and the auxiliary lip are both axially extended. The second inner wall and the outer diameter of the retaining ring are spaced apart, and the auxiliary lip extends between the second inner wall and the retaining ring and is clearance-fitted with both.

5. The cam follower needle roller bearing for a punch press spindle according to claim 1, 2 or 4, characterized in that: The inner ring includes a second annular groove located at both axial ends of the inner ring. The retaining ring is mounted on the second annular groove and abuts against the radially extending inner wall of the second annular groove. The end faces of the two retaining rings facing outward are flush with the two axial end faces of the inner ring.

6. The cam follower needle roller bearing for a punch press spindle according to claim 5, characterized in that: The inner ring includes a clearance groove, and the clearance groove is arranged at the connection of the inner walls on both sides of the second ring groove.

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