Pre-tightening type gapless ball bearing

Abstract

The utility model discloses a pre -tight formula no gap ball bearing relates to the technical field of steering transmission shaft, and the outer peripheral surface of ball bearing one end is provided with a plurality of independent ball bearing raceway, and the inner peripheral surface of ball bearing sleeve is provided with ball bearing accommodating raceway correspondingly, and ball bearing rolls and sets up in the closed raceway space, be provided with elastic wear -resistant clamping piece between ball bearing and ball bearing raceway, one side of elastic wear -resistant clamping piece is attached with ball bearing raceway, and the other side is contacted with ball bearing, and elastic wear -resistant clamping piece has the elastic recovery ability to compensate the gap of ball bearing and ball bearing sleeve wear and tear produces. The utility model discloses reasonable structure design, through setting up high -strength elastic wear -resistant clamping piece between ball bearing and ball bearing raceway, utilize its elastic deformation automatic compensation gap, realize sustained pre -tight and wear and tear self -compensation, cooperate with the anti -rotation limit piece and limit component relative rotation, and the transmission stability is promoted, and the problem of traditional transmission axle's loose abnormal sound is effectively solved, and the stable steering is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of steering drive shaft technology, and in particular to a pre-tightened backlash-free ball shaft. Background Technology

[0002] In traditional ball-bearing steering shafts, the long-term relative rolling of the ball shaft and ball sleeves easily leads to wear, increasing the clearance between the balls and raceways. This can cause transmission loosening, abnormal noise, and even affect steering accuracy. Existing technologies mainly alleviate the problem by improving machining accuracy or regular maintenance, but they lack a self-adaptive structure to actively compensate for wear clearance, making it impossible to maintain transmission stability in the long term, and maintenance costs are high. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned technical problems and provide a pre-tightened, backlash-free ball shaft that can automatically compensate for wear gaps, thereby extending the service life of the steering drive shaft and improving transmission stability.

[0004] To achieve the above technical objectives and requirements, the technical solution adopted by this utility model is as follows: a pre-tightened, backlash-free ball bearing shaft, comprising a ball bearing shaft, a ball bearing sleeve, and balls. Multiple independent ball bearing raceways are provided on the outer circumferential surface of one end of the ball bearing shaft. The ball bearing sleeve is coaxially fitted onto the outside of the ball bearing shaft. A corresponding ball receiving raceway is provided on the inner circumferential surface of the ball bearing sleeve. The ball receiving raceway and the ball bearing raceway together form a closed raceway space, within which several balls are rotatably disposed. An elastic wear-resistant clip is provided between the balls and the ball bearing raceway. One side of the elastic wear-resistant clip is in contact with the ball bearing raceway, and the other side is in contact with the balls. The elastic wear-resistant clip has elastic recovery capability to compensate for the gap caused by wear between the ball bearing shaft and the ball bearing sleeve. An anti-rotation limiting piece is provided at the end of the ball bearing shaft to restrict the relative rotation between the ball bearing sleeve and the ball bearing shaft.

[0005] Preferably, the ball bearing raceways are evenly distributed along the circumference of the ball bearing, and the number of elastic wear-resistant clips is the same as the number of ball bearing raceways, and they are correspondingly arranged in each ball bearing raceway.

[0006] Preferably, the elastic wear-resistant clip includes a U-shaped receiving groove, the two sides of which are folded outward to form symmetrical elastic arms. The elastic deformation of the elastic arms generates a continuous preload force, so that the balls are always in close contact with the U-shaped receiving groove and the ball receiving raceway of the ball sleeve, compensating for the initial gap and wear gap.

[0007] Preferably, the opening angle α of the U-shaped receiving groove is set to 70°~110°, and more preferably 90°.

[0008] Preferably, the anti-rotation limiting plate has multiple anti-rotation protrusions evenly distributed on its outer periphery, and the anti-rotation protrusions cooperate with the ball receiving raceway to limit the relative rotation between the ball sleeve and the ball shaft.

[0009] Preferably, the number of the anti-rotation protrusions is the same as the number of the ball bearing raceways and they correspond one-to-one.

[0010] Preferably, the anti-rotation limiting piece is detachably fixed to the end of the ball shaft.

[0011] Preferably, each ball bearing raceway extends axially inward from the end face of the ball bearing, and the ball bearing has a shoulder formed on the end face of the ball bearing raceway. One end of the elastic wear-resistant clip abuts against the shoulder, and the other end is limited by the end face of the anti-rotation limiting piece to achieve axial fixation.

[0012] Compared with the traditional structure, the beneficial effects of this utility model are: 1. This utility model has a reasonable structural design. By setting a high-strength elastic wear-resistant clip between the ball and the ball shaft raceway, the clip automatically compensates for the gap by its elastic deformation, thereby achieving continuous pre-tightening and wear self-compensation. Combined with the anti-rotation limiting plate to restrict the relative rotation of the components, the transmission stability is improved, effectively solving the problem of loosening and abnormal noise in traditional drive shafts and ensuring smooth steering. 2. The wear-resistant properties of the elastic wear-resistant clips reduce their own wear and reduce direct wear between the balls and the raceways, thus extending their service life. During normal operation, the clips provide preload to ensure the fit between the balls and the raceways. After wear occurs, the elastic deformation of the clips absorbs the gap and maintains tight fit. 3. This utility model has self-compensation properties, requiring no additional adjustment, automatically adapting to the wear process, improving maintenance convenience, and reducing maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the raceway of this utility model; Figure 3 This is a schematic diagram of the ball shaft structure after removing the ball sleeve according to this utility model; In the diagram: 1. Ball bearing, 11. Ball bearing raceway, 12. Shoulder, 2. Ball sleeve, 21. Ball receiving channel, 3. Ball, 4. Elastic wear-resistant clip, 41. U-shaped receiving groove, 42. Elastic arm, 5. Anti-rotation limiting piece, 51. Anti-rotation protrusion. Detailed Implementation

[0014] The present invention will be further described below.

[0015] like Figures 1-2As shown, a pre-tightened, backlash-free ball bearing includes a ball bearing 1, a ball sleeve 2, and balls 3. The outer circumferential surface of one end of the ball bearing 1 is provided with multiple independent ball bearing raceways 11. The ball sleeve 2 is coaxially sleeved on the outside of the ball bearing 1. The inner circumferential surface of the ball sleeve 2 is correspondingly provided with a ball receiving raceway 21. The ball receiving raceway 21 and the ball bearing raceway 11 together form a closed raceway space, within which several balls 2 are rotatably disposed. An elastic wear-resistant clip 4 is provided between the balls 3 and the ball bearing raceway 11. One side of the elastic wear-resistant clip 4 is in contact with the ball bearing raceway 11, and the other side is in contact with the balls 3. The elastic wear-resistant clip 4 has elastic recovery capability to compensate for the gap caused by wear between the ball bearing 1 and the ball sleeve 2. An anti-rotation limiting piece 5 is provided at the end of the ball bearing 1 to limit the relative rotation between the ball sleeve 2 and the ball bearing 1.

[0016] The ball bearing raceways 11 are evenly distributed circumferentially along the ball bearing 1. The number of elastic wear-resistant clips 4 is the same as the number of ball bearing raceways 11, and they are correspondingly arranged within each ball bearing raceway 11. Each elastic wear-resistant clip 4 includes a U-shaped receiving groove 41. The two sides of the U-shaped receiving groove 41 are folded outward to form symmetrical elastic arms 42. The elastic deformation of the elastic arms 42 generates a continuous preload force, so that the balls 3 are always in close contact with the U-shaped receiving groove 41 and the ball receiving raceway 21 of the ball sleeve 2, compensating for the initial clearance and wear clearance.

[0017] The opening angle α of the U-shaped receiving groove 41 is set to 70°~110°, preferably 90°.

[0018] like Figure 3 As shown, the anti-rotation limiting piece 5 is detachably fixed to the end of the ball shaft 1. The outer periphery of the anti-rotation limiting piece 5 is evenly provided with a plurality of anti-rotation protrusions 51. The anti-rotation protrusions 51 cooperate with the ball receiving raceway 21 to limit the relative rotation between the ball sleeve 2 and the ball shaft 1. The number of anti-rotation protrusions 51 is the same as the number of ball shaft raceways 11 and corresponds one-to-one.

[0019] Each of the ball bearing raceways 11 extends axially inward from the end face of the ball bearing 1. The ball bearing 1 has a shoulder 12 formed on the end face of the ball bearing raceway 11. One end of the elastic wear-resistant clip 4 abuts against the shoulder 12, and the other end is limited by the end face of the anti-rotation limiting piece 5 to achieve axial fixation.

[0020] In practice, this utility model includes the following steps: 1) Insert the elastic wear-resistant clip 4 into the ball bearing raceway 11 to achieve pre-compression assembly and ensure the initial elastic preload; the thickness of the high-strength elastic wear-resistant clip 4 is designed to be 0.5-2mm, which can be adjusted according to the preload requirement, and 3-6 sets are evenly distributed in the circumferential direction. 2) Place the balls 3 into the U-shaped receiving groove 41 of the elastic wear-resistant clamp 4 in sequence, so that the balls 3 are in close contact with the elastic wear-resistant clamp 4; the number of balls is designed according to the load of the drive shaft, usually 3-12 balls per group, and 3-6 groups are evenly distributed in the circumference. 3) The ball sleeve 2 is coaxially fitted on the outside of the ball shaft 1, which contains the balls 3 and the elastic wear-resistant clips 4, to ensure that the ball shaft 1 and the ball receiving raceway 21 of the ball sleeve 2 are aligned. 4) Install the anti-rotation limiting plate 5 and fix it with bolts or clips so that its axial end face is tightly fitted with one end of the elastic wear-resistant clamp 4 to complete the assembly and achieve axial bidirectional limiting of the elastic wear-resistant clamp 4.

[0021] When the steering drive shaft is working normally, the elastic arm of the elastic wear-resistant clamp 4 generates a certain preload force, which makes the elastic wear-resistant clamp 4 fit tightly against the ball 3 and the ball shaft raceway 11, eliminating the initial gap and ensuring a tight fit between the ball 3 and the ball shaft 1 and the ball sleeve 2, so as to achieve stable torque or axial force transmission.

[0022] When the steering drive shaft has been used for a long time, the raceways of the ball shaft 1 and the ball sleeve 2 will wear, resulting in an increase in the gap between the balls and the raceways. The elastic wear-resistant clip 4 will automatically fill the gap caused by the wear by its own elastic deformation, maintain the tight contact between the balls and the raceways, ensure the accuracy and smoothness of the transmission, and avoid problems such as transmission loosening and abnormal noise caused by the increase in gap, thereby extending the service life of the steering drive shaft.

[0023] The above embodiments of this utility model are merely examples to clearly illustrate this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent technical solutions also fall within the scope of this utility model, and the patent protection scope of this utility model should be defined by each claim.

Claims

1. A pre-tightening type gapless ball bearing, comprising a ball bearing (1), a ball sleeve (2), and balls (3), characterized in that: The outer circumferential surface of one end of the ball shaft (1) is provided with multiple independent ball shaft raceways (11). The ball sleeve (2) is coaxially sleeved on the outside of the ball shaft (1). The inner circumferential surface of the ball sleeve (2) is correspondingly provided with a ball receiving raceway (21). The ball receiving raceway (21) and the ball shaft raceway (11) together form a closed raceway space. Several balls (3) are rotatably disposed in the closed raceway space. The balls (3) and the ball... An elastic wear-resistant clip (4) is provided between the raceways (11) of the bearing shaft. One side of the elastic wear-resistant clip (4) is in contact with the raceway (11) of the ball bearing shaft, and the other side is in contact with the ball (3). The elastic wear-resistant clip (4) has elastic recovery capability to compensate for the gap caused by wear between the ball bearing shaft (1) and the ball sleeve (2). An anti-rotation limiting piece (5) is provided at the end of the ball bearing shaft (1) to limit the relative rotation between the ball sleeve (2) and the ball bearing shaft (1).

2. The pretensioned gapless ball bearing shaft of claim 1, wherein: The ball bearing raceways (11) are evenly distributed along the circumference of the ball bearing (1), and the number of elastic wear-resistant clips (4) is the same as the number of ball bearing raceways (11), and they are correspondingly arranged in each ball bearing raceway (11).

3. The pretensioned zero clearance ball bearing shaft of claim 1, wherein: The elastic wear-resistant clip (4) includes a U-shaped receiving groove (41). The two sides of the U-shaped receiving groove (41) are folded outward to form symmetrical elastic arms (42). The elastic deformation of the elastic arms (42) generates a continuous pre-tightening force, so that the ball (3) is always in close contact with the ball receiving raceway (21) of the U-shaped receiving groove (41) and the ball sleeve (2), compensating for the initial gap and wear gap.

4. The pretensioned zero clearance ball bearing shaft of claim 3, wherein: The opening angle α of the U-shaped receiving groove (41) is set to 70°~110°.

5. The pretensioned zero clearance ball bearing shaft of claim 1, wherein: The anti-rotation limiting plate (5) has multiple anti-rotation protrusions (51) evenly distributed on its outer periphery. The anti-rotation protrusions (51) cooperate with the ball receiving raceway (21) to limit the relative rotation between the ball sleeve (2) and the ball shaft (1).

6. The pretensioned zero clearance ball bearing shaft of claim 5, wherein: The number of anti-rotation protrusions (51) is the same as the number of ball bearing raceways (11) and they correspond one-to-one.

7. The pretensioned zero clearance ball bearing shaft of claim 1, wherein: The anti-rotation limiting piece (5) is detachably fixed to the end of the ball shaft (1).

8. The pretensioned zero clearance ball bearing shaft of claim 1, wherein: Each of the ball bearing raceways (11) extends axially inward from the end face of the ball bearing (1). The ball bearing (1) has a shoulder (12) formed on the end face of the ball bearing raceway (11). One end of the elastic wear-resistant clip (4) abuts against the shoulder (12), and the other end is limited by the end face of the anti-rotation limiting piece (5) to achieve axial fixation.

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