A force-amplifying shaft end clamping self-locking device

Abstract

The present invention relates to a force-amplifying shaft end clamping self-locking device, characterized in that it comprises: a housing, a ball, a retaining frame, a clamping block, a spiral clamping block, a bearing housing, a test bearing, and a connecting shaft; the housing is connected to the spiral clamping block by internal and external threads, the spiral clamping block ball groove contacts the ball surface, the ball contacts the spherical surface of the housing side wall, and after installation, the retaining frame is rigidly connected to the spiral clamping block for axial fixation, there are six clamping blocks, which are axially symmetrically installed in the retaining frame, slidingly cooperate with the retaining frame, and prevented from falling off by the limit block on the top of the clamping block, the clamping block is installed on the connecting shaft through the shaft hole, cooperates with the connecting shaft shoulder to axially position the test bearing, and forms a set of bearing test force-amplifying shaft end clamping self-locking device with the bearing housing. The present invention adopts a mechanical connection method, which is safe and reliable.

Description

Technical Field

[0001] The invention relates to the field of fixed self-locking clamping of specific bearing runs and test shaft ends, and in particular to a force-amplifying shaft end clamping self-locking device. Background Art

[0002] At present, in the field of bearing running and test shaft end clamping, due to the different test bearing models, the shaft diameter varies greatly, the test shaft end thread processing accuracy requirements are high, and the locking nut needs to cause little damage to the thread, resulting in many wearing parts in bearing running and testing, great economic waste, and difficulty in meeting the growing demand; to overcome these problems, the present invention provides a force amplifying shaft end clamping self-locking device, which has the advantages of small size, low shaft end accuracy requirements, good self-locking performance, solid and durable structure, easy disassembly and maintenance, wide applicability, low shaft damage, and modular structural design. Summary of the Invention

[0003] The purpose of the present invention is to provide a force amplifying shaft end clamping self-locking device which has a simple and durable structure, a small size, good self-locking performance, an overall modular design, is easy and quick to install and disassemble, and can be applied to shafts of different specifications.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A force-amplifying shaft end clamping and self-locking device, comprising: a housing, a ball, a retaining frame, a clamping block, a spiral block, a bearing housing, a test bearing, and a connecting shaft; the housing and the spiral block are connected by internal and external threads, the spiral block ball groove contacts the spherical surface of the ball, and the ball contacts the spherical surface of the housing side wall; after installation, the retaining frame is rigidly connected to the spiral block for axial fixation; there are six clamping blocks, which are axially symmetrically installed in the retaining frame and slidingly cooperate with the retaining frame, and are prevented from falling off by the limit block on the top of the clamping block; the clamping block is installed on the connecting shaft through the shaft hole, cooperates with the connecting shaft shoulder to axially position the test bearing, and forms a set of bearing test force-amplifying shaft end clamping and self-locking device with the bearing housing.

[0006] Furthermore, by rotating the spiral pressure block relative to the housing to generate a rightward force F, under the action of the ball and the side wall of the housing, the force is transmitted to the clamping pressure block to form a radial force F', and the radial force F'=F×1 / tana×1 / tanb is obtained through the force transmission; according to the trigonometric function relationship, when the angle a and the angle b are less than 45°, F' is greater than F, thereby achieving the amplification of the clamping force at the shaft end and the self-locking function of the shaft end clamping.

[0007] Furthermore, the spiral pressing block is made of 45 steel, has a tapered funnel shape inside, and is axially symmetrically processed with six ball grooves to increase the contact area with the ball and reduce point-to-surface contact stress concentration. The outer ring of the spiral pressing block is processed with metric fine thread to reduce the helix angle, which is more conducive to self-locking of the thread.

[0008] Furthermore, the retaining frame is made of nickel-copper alloy, which has good mechanical properties and high-temperature strength, good corrosion resistance and wear resistance, and is easy to process. The whole is cylindrical, and six axially symmetrical guide grooves are processed inside to reduce friction with the clamping block and improve service life.

[0009] Furthermore, the clamping block is made of 45 steel, which has good wear resistance, high strength and hardness. The overall structure is annular, and the top inclined surface is processed with a ball groove to increase the contact area with the ball, so as to withstand a larger radial extrusion pressure, improve the operating range and safety performance, and the bottom is a circular groove surface to increase the contact area with the shaft end, the axial contact length is large, and the stress caused by the smaller bending moment is concentrated, which is safe and reliable.

[0010] The beneficial effects of implementing the force amplifying shaft end clamping self-locking device of the present invention are:

[0011] (1) The locking device is modular in design. The shaft end is locked by rotating the spiral pressure block, achieving axial self-locking fixation in a narrow space. The ball bearing design has a reasonable structure, is easy and quick to install and disassemble, is safe and reliable in positioning, causes little damage to the shaft end, and is simple and efficient to repair and maintain.

[0012] (2) The force-amplifying shaft end clamping self-locking device of the present invention can meet the needs of shaft ends without threaded connections, can realize the use of shaft diameter spans, and avoids damage to the shaft end threads caused by frequent disassembly during the thread tightening experiment. The overall design is highly practical, simple to operate, has a good self-locking effect, improves the use efficiency, and is excellent in economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of the present invention;

[0015] Figure 3 It is a left side view of the present invention;

[0016] Figure 4 Schematic diagram of the force applied to the ball of the present invention.

[0017] In the figure: 1-housing, 2-ball, 3-cage, 4-clamping block, 5-screw block, 6-bearing housing, 7-test bearing, 8-connecting shaft. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 、 2 As shown in Figures 3 and 4, a force-amplifying shaft end clamping and self-locking device comprises: a housing 1, a ball 2, a retaining frame 3, a clamping block 4, a spiral block 5, a bearing housing 6, a test bearing 7, and a connecting shaft 8; the housing 1 is connected to the spiral block 5 by internal and external threads, the ball groove of the spiral block 5 is in spherical contact with the ball 2, and the ball 2 is in point contact with the spherical surface of the side wall of the housing 1. After installation, the retaining frame 3 is rigidly connected to the spiral block 5 for axial fixation. There are six clamping blocks 4, which are axially symmetrically installed in the retaining frame 3 and slidingly cooperate with the retaining frame 3. They are prevented from falling off by the top limit block of the clamping block 4. The clamping block 4 is installed on the connecting shaft 8 through the shaft hole, and cooperates with the shaft shoulder of the connecting shaft 8 to axially position the test bearing 7, forming a set of bearing test force-amplifying shaft end clamping and self-locking device with the bearing housing 6.

[0020] like Figure 1 、 2 As shown in Figures 3 and 4, a force-amplifying shaft end clamping self-locking device generates a rightward force F relative to the housing 1 by rotating the spiral pressure block 5. Under the action of the ball 2 and the side wall of the housing 1, the force is transmitted to the clamping pressure block 4 to form a radial force F'. The radial force F'=F×1 / tana×1 / tanb is obtained through the force transmission. It can be seen from the trigonometric function relationship that when the angle a and the angle b are less than 45°, F' is greater than F, thereby realizing the amplification of the shaft end clamping force and the shaft end clamping self-locking function.

[0021] like Figure 1 、 2 As shown in Figures 3 and 4, a force-amplifying shaft end clamping self-locking device is provided. The spiral pressing block 5 is made of 45 steel, and has a tapered funnel shape inside. Six ball grooves are symmetrically processed on the axis to increase the contact area with the ball 2 and reduce the point-to-surface contact stress concentration. The outer ring of the spiral pressing block 5 is processed with metric fine thread, which has the characteristic of a small helix angle and is more conducive to the self-locking of the thread.

[0022] like Figure 1 、 2 As shown in Figures 3 and 4, a force-amplifying shaft end clamping self-locking device is used. The retaining frame 3 is made of nickel-copper alloy, which has good mechanical properties and high-temperature strength, good corrosion resistance and wear resistance, and is easy to process. The whole is cylindrical, and six axially symmetrical guide grooves are processed inside to reduce friction with the clamping block 4 and improve service life.

[0023] like Figure 1 、 2As shown in Figures 3 and 4, a force-amplifying shaft end clamping self-locking device is used. The clamping block 4 is made of 45 steel, which has good wear resistance, high strength and hardness. The overall structure is annular, and the top inclined surface is processed with a ball groove to increase the contact area with the ball 2, so as to withstand a larger radial extrusion force, improve the operating range and safety performance, and the bottom is a circular groove surface to increase the contact area with the shaft end, the axial contact length is large, and the stress caused by the smaller bending moment is concentrated, which is safe and reliable.

[0024] like Figure 1 、 2 As shown in , 3, and 4, a working mode of a force amplifying shaft end clamping self-locking device is as follows: the housing 1 is connected to the spiral pressure block 5 by internal and external threads, the ball groove of the spiral pressure block 5 is in spherical contact with the ball 2, and the ball 2 is in point contact with the spherical surface of the side wall of the housing 1. After the retaining frame 3 is installed, it is rigidly connected to the spiral pressure block 5 for axial fixation. There are six clamping pressure blocks 4, which are axially symmetrically installed in the retaining frame 3 and slide-fit with the retaining frame 3. The top limit block of the clamping pressure block 4 prevents them from falling off. The clamping pressure block 4 is installed on the connecting shaft 8 through the axial hole, and cooperates with the shoulder of the connecting shaft 8 to axially position the test bearing 7. The bearing housing 6 cooperates with the outer ring of the test bearing 7 to form a set of bearing test force amplifying shaft end clamping self-locking device, and the spiral pressure block 5 is rotated. Under the threaded cooperation, the axial distance between the housing 1 and the spiral pressure block 5 is shortened, and the ball 2 moves downward to push the clamping pressure block 4 to move vertically in the retaining frame 3, realizing the force amplification and axial compression self-locking functions.

[0025] The scope of protection of the present invention is not limited to the above. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined by the claims.

Claims

1. A force-amplifying shaft end clamping self-locking device, characterized in that: include: A housing (1), a ball (2), a retaining frame (3), a clamping block (4), a spiral block (5), a bearing housing (6), a test bearing (7), and a connecting shaft (8); the housing (1) and the spiral block (5) are connected via internal and external threads, the ball groove of the spiral block (5) is in spherical contact with the ball (2), the ball (2) is in point contact with the spherical surface of the side wall of the housing (1), and the retaining frame (3) is rigidly connected to the spiral block (5) for axial fixation after installation. There are six clamping blocks (4), which are axially symmetrically installed in the retaining frame (3) and slide in conjunction with the retaining frame (3). The clamping blocks (4) are prevented from falling off by the top limit block. The clamping blocks (4) are installed on the connecting shaft (8) through the shaft hole, and cooperate with the shaft shoulder of the connecting shaft (8) to axially position the test bearing (7), and form a set of force-amplifying shaft end clamping self-locking device for bearing testing with the bearing housing (6); By rotating the spiral pressing block (5) relative to the housing (1), a rightward force F is generated. Under the action of the ball (2) and the side wall of the housing (1), the force is transmitted to the clamping pressing block (4) to form a radial force F'. Through the force transmission, the radial force F'=F×1 / tana×1 / tanb is obtained. According to the trigonometric function relationship, when the angle a and the angle b are less than 45°, F' is greater than F, thereby achieving the amplification of the clamping force at the shaft end. The spiral pressing block (5) is made of 45 steel, has a tapered funnel shape inside, and is axially symmetrically processed with six ball grooves to increase the contact area with the ball (2) and reduce the point-to-surface contact stress concentration. The outer ring of the spiral pressing block (5) is processed with a metric fine thread to reduce the size of the spiral lead angle; The retaining frame (3) is made of nickel-copper alloy and is cylindrical in shape. Six axially symmetrical guide grooves are machined inside to reduce friction with the clamping block (4). The clamping block (4) is made of 45 steel and has an overall annular structure. A ball groove is machined on the top inclined surface to increase the contact area with the ball (2).

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