Anti- eccentric rotation torsion shaft

Abstract

The utility model provides an eccentric rotation prevention's torsion shaft belongs to torsion shaft technical field, the utility model discloses a fixed seat with a plurality of support shafts is set up in the both ends of outer tube, and is installed with the rotary bearing on each support shaft, simultaneously, the rotary shaft of coaxial extension is set up in the both ends of core rod, and two rotary shafts respectively extend to between a plurality of rotary bearings of corresponding end and all abut with each rotary bearing, and the rotary shaft of core rod both ends is supported through rotary bearing, satisfies the rotary demand of core rod simultaneously, can avoid the radial movement of core rod, prevents the problem of inclination, eccentricity caused by uneven stress, thereby guarantees the use performance of torsion shaft, prolongs the service life of torsion shaft, and simultaneously still can make the stability of the vehicle of using this torsion shaft, and the driving experience is better, and the goods transportation is safer.

Description

Technical Field

[0001] This utility model relates to the field of torsion shaft technology, specifically to a torsion shaft that prevents eccentric rotation. Background Technology

[0002] To improve vehicle stability and reduce roll vibration, a torsion shaft is usually installed between the vehicle body and the frame. This reduces the impact of uneven road surfaces on the vehicle, lowers the risk of damage to vehicle structural components, and extends the vehicle's service life.

[0003] Currently, commercially available torsion shafts typically use rubber torsion shafts. The structure of such rubber torsion shafts is as disclosed in patent application CN101879850A. It consists of a square-section mandrel inside an outer tube, with the surface of the mandrel forming a 40-50° angle with the surface of the outer tube. The axial centers of the outer tube and the mandrel coincide. Four buffer spaces are formed between the four corners of the inner wall of the outer tube and the four surfaces of the mandrel. A rubber rod is pressed into each of these four buffer spaces. One end of the mandrel is outside the opening of the outer tube and connected to one end of a swing arm. The swing arm swings up and down around the axis of the mandrel. The other end of the swing arm is connected to the wheel of the vehicle. When the vehicle travels over uneven surfaces, the wheel twists the swing arm, causing the four surfaces of the mandrel to compress the rubber rod. The rubber rod deforms within the corresponding buffer spaces, achieving cushioning and shock absorption, thereby reducing the impact of the road surface on the vehicle and improving vehicle comfort. Although the above structure can meet the requirements of buffering and shock absorption, the uneven force on the mandrel when it is twisted under the action of the swing arm can easily lead to the mandrel being eccentric. This results in differences in the pressure of the mandrel on the four rubber rods, which can shorten the life of some rubber rods and affect the overall performance and service life of the torsion shaft. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention aims to provide a torsion shaft that prevents eccentric rotation. A fixed seat is provided at both ends of the outer tube, and several support shafts are evenly distributed on the fixed seat. Each support shaft is equipped with a rotary bearing. Simultaneously, a rotating shaft is provided at both ends of the mandrel, with each rotating shaft abutting against the rotary bearing on the corresponding support shaft. The rotary bearings provide radial support to both ends of the mandrel, ensuring rotation while preventing tilting or eccentricity. This ensures that the pressure on each rubber strip is uniform during mandrel rotation, guaranteeing the performance of the torsion shaft and extending its service life.

[0005] The specific technical solution is as follows: An anti-eccentric rotation torsion shaft includes an outer tube, a core rod, rubber strips, a swing arm, and a connecting plate. The outer tube is a square tube with a square cross-section, and the core rod is a solid rod with a square cross-section. The core rod is installed inside the outer tube, and the two are offset at 45° in the circumferential direction. Rubber strips are provided in the inner cavity of the outer tube at each of the four corners, and the rubber strips abut against the four sides of the core rod. One end of the core rod extends outside the outer tube and is connected to one end of the swing arm. A connecting plate is rotatably mounted on the other end of the swing arm. The shaft, characterized by these features, further includes: The fixed base is located at the ends of the outer tube. A through hole is opened in the center of the fixed base. Furthermore, several support shafts are arranged along the axial direction of the outer tube on the inner side of each fixed base. The support shafts on the same fixed base are arranged in a ring array with the axis in the length direction of the outer tube as the center. In addition, a rotating bearing is coaxially installed on each support shaft to abut against the mandrel. This satisfies the need to support the mandrel and also accommodate the rotation of the mandrel. Furthermore, both ends of the mandrel are provided with rotating shafts extending along their axial direction. When the mandrel is installed inside the outer tube, the two rotating shafts abut against several rotating bearings on the two fixed seats respectively. Moreover, the rotating shafts are located in the space enclosed by several rotating bearings on the corresponding fixed seats and abut against each rotating bearing. After one rotating shaft is extended, it passes through the connecting hole and connects to the swing arm.

[0006] In the aforementioned anti-eccentric rotation torsion shaft, the shaft and the mandrel are an integral structure.

[0007] In the aforementioned anti-eccentric rotation torsion shaft, one end of the shaft extending from the connecting hole is provided with a positioning surface arranged tangentially thereon, and at the same time, the end of the swing arm connected to the shaft is provided with an insertion hole, and the inner wall of the insertion hole is provided with a limiting surface that cooperates with the positioning surface.

[0008] In the aforementioned anti-eccentric rotation torsion shaft, a limit ring is provided on the inner wall of the outer tube at one end, and one end of the rubber strip abuts against the limit ring.

[0009] In the aforementioned anti-eccentric rotation torsion shaft, an extension cylinder is provided on the fixed seat at the end of the outer tube away from the limiting retaining ring, and the extension cylinder is sleeved outside the corresponding support shaft and rotating bearing. The end of the extension cylinder away from the fixed seat extends toward the inside of the outer tube and abuts against the other end of the rubber strip.

[0010] In the aforementioned anti-eccentric rotation torsion shaft, the projection of the shaft along the axial direction of the mandrel is located within the end face of the mandrel so that an abutment step is formed between the shaft and the mandrel. When the mandrel is installed in the outer tube, the abutment steps at both ends of the mandrel abut against the end face of the support shaft on the corresponding end of the fixed seat.

[0011] In the aforementioned anti-eccentric rotation torsion shaft, each shaft is fitted with an end face bearing, and the two ends of the end face bearing respectively abut against the end face of the support shaft of the abutment step and the corresponding end of the fixed seat.

[0012] In the aforementioned anti-eccentric rotation torsion shaft, a telescopic hole is provided along the axial direction on the end face of the support shaft on a fixed base that abuts against the end face bearing, and a retaining spring is installed in the telescopic hole, with one end of the retaining spring abutting against the corresponding end face bearing.

[0013] In the aforementioned anti-eccentric rotation torsion shaft, a groove is formed on the outer wall of the end of each support shaft away from the fixed seat, and a retaining ring is provided in the groove, which presses against the corresponding rotating bearing.

[0014] In the aforementioned anti-eccentric rotation torsion shaft, each fixed seat and the outer tube are welded together.

[0015] The positive effects of the above technical solution are: The aforementioned anti-eccentric rotation torque shaft has fixed seats at both ends of the outer tube, and each fixed seat is equipped with several support shafts with rotating bearings. In addition, rotating shafts are coaxially arranged at both ends of the mandrel, so that the two ends of the mandrel can be supported by the rotating bearings on the corresponding fixed seats. While maintaining the rotation of the mandrel, it can also prevent the mandrel from tilting or becoming eccentric due to uneven force, ensuring that the force on each rubber strip is the same, ensuring the performance of the torque shaft, extending its service life, thereby improving the driving experience of vehicles using the torque shaft and facilitating cargo transportation. Attached Figure Description

[0016] Figure 1 This is a structural diagram from one perspective of an embodiment of the anti-eccentric rotation torsion shaft of the present invention. Figure 2 This is a structural diagram from another perspective of an embodiment of the anti-eccentric rotation torsion shaft of this utility model; Figure 3 for Figure 2 Sectional view along line AA; Figure 4 for Figure 2 Sectional view along line BB; Figure 5 for Figure 4 A cross-sectional view along the CC line; Figure 6 for Figure 5 A cross-sectional view along line DD.

[0017] In the attached diagram: 1. Outer tube; 11. Limiting ring; 2. Core rod; 21. Rotating shaft; 211. Positioning surface; 212. Abutting step; 3. Rubber strip; 4. Swing arm; 5. Connecting plate; 6. Fixed seat; 61. Connecting hole; 62. Support shaft; 63. Rotating bearing; 64. Extension cylinder; 65. Snap ring; 621. Telescopic hole; 622. Clamping spring; 7. End face bearing. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 6 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0019] Figure 1 This is a structural diagram from one perspective of an embodiment of the anti-eccentric rotation torsion shaft of the present invention. Figure 2 This is a structural diagram from another perspective of an embodiment of the anti-eccentric rotation torsion shaft of this utility model; Figure 3 for Figure 2 A sectional view along line AA. (See example) Figure 1 , Figure 2 as well as Figure 3As shown, the anti-eccentric rotation torque shaft provided in this embodiment includes: an outer tube 1, a core rod 2, a rubber strip 3, a swing arm 4, a connecting plate 5, a fixed seat 6, a rotating bearing 63, and a rotating shaft 21. At this time, as with the torque shaft structure in the prior art, the outer tube 1 is a square tube with a square cross-section, and the core rod 2 is a solid rod with a square cross-section. Preferably, the edges of the outer tube 1 and the core rod 2 are rounded, so that the corners of the buffer space formed by the inner wall of the outer tube 1 and the outer wall of the core rod 2 can be smoother. This allows the rubber strip 3 installed in the buffer space to better abut against the inner wall of the outer tube 1 and be squeezed and deformed, resulting in a better buffering effect. At the same time, it can also prevent the rubber strip 3 from being crushed and extend its service life. During installation, the mandrel 2 is installed inside the outer tube 1, with the two offset at 45° circumferentially. Rubber strips 3 are installed in the inner cavity of the outer tube 1 at each of the four corners, and these rubber strips 3 abut against the four faces of the mandrel 2, ensuring that the center of the mandrel 2's surface corresponds to the rounded corner of the outer tube 1. This maximizes the buffer space, facilitates the installation of the rubber strips 3, and meets the initial setting requirements of the torsion shaft. Furthermore, one end of the mandrel 2 extends outside the outer tube 1 and is connected to one end of the swing arm 4, allowing the swing arm 4 to drive the mandrel 2 to rotate. A connecting plate 5 is rotatably mounted on the other end of the swing arm 4. The connecting plate 5 is connected to other structural components using screws or other threaded fasteners, satisfying structural connection requirements while absorbing torque transmitted from other structural components, thereby achieving buffering and shock absorption, improving vehicle operating comfort, and ensuring safe cargo transportation. It is worth noting that since the rubber torsion shaft is a commonly used structure in the current market and belongs to existing technology, its overall structure will not be described in detail here.

[0020] Figure 4 for Figure 2 Sectional view along line BB; Figure 5 for Figure 4 A cross-sectional view along the CC line; Figure 6 for Figure 5 A sectional view along line DD. (See example) Figures 3 to 6 As shown, the fixing seat 6 is located at both ends of the outer tube 1, sealing both ends of the outer tube 1 and protecting the internal structure of the outer tube 1. Simultaneously, a through-hole 61 is provided at the center of each fixing seat 6, providing a condition for one end of the mandrel 2 to extend outside the outer tube 1 and connect with the swing arm 4. Furthermore, several support shafts 62 are arranged axially along the outer tube 1 on the inner side of each fixing seat 6. These support shafts 62 on the same fixing seat 6 are arranged in a circular array with the axis along the length of the outer tube 1 as the center, ensuring that the distance from the axis of each support shaft 62 to the axis along the length of the outer tube 1 is consistent, thus providing a condition for maintaining the coaxial arrangement of the mandrel 2 and the square tube. In addition, a rotating bearing 63 is coaxially mounted on each support shaft 62.

[0021] Specifically, both ends of the mandrel 2 are provided with axially extending shafts 21. When the mandrel 2 is installed inside the outer tube 1, the two shafts 21 abut against several rotating bearings 63 on the two fixed seats 6 respectively. Furthermore, the shafts 21 are located within the space enclosed by the rotating bearings 63 on the corresponding fixed seats 6 and abut against each rotating bearing 63. This provides radial support to the corresponding shafts 21 through the rotating bearings 63 on the fixed seats 6, preventing the ends of the mandrel 2 from tilting or shifting. Simultaneously, the rotation of the rotating bearings 63 adapts to the rotational requirements of the mandrel 2, avoiding the problem of uneven pressure on different rubber strips 3 when the mandrel 2 tilts or becomes eccentric due to uneven force, thus improving performance and extending service life. Additionally, one shaft 21 extends out through the connecting hole 61 and connects to the swing arm 4, allowing the swing arm 4 to twist the mandrel 2 via the shaft 21, thereby compressing the rubber strips 3 and achieving shock absorption.

[0022] More specifically, the rotating shafts 21 at both ends of the mandrel 2 are integrated with the mandrel 2, resulting in higher structural strength, better resistance to torsional fracture, and better suitability for installation in torsion shafts.

[0023] More specifically, a positioning surface 211 is provided on one end of the rotating shaft 21 extending from the connecting hole 61 of the fixed base 6, arranged tangentially therein. Preferably, the positioning surface 211 is a plane. At the same time, an insertion hole is provided at the end of the swing arm 4 connected to the rotating shaft 21. A limiting surface that cooperates with the positioning surface 211 is provided on the inner wall of the insertion hole. That is, when the swing arm 4 is connected to one end of the rotating shaft 21, the circumferential limiting between the two can be achieved by the mutual contact between the positioning surface 211 and the limiting surface, ensuring that the swing arm 4 can smoothly drive the core rod 2 to rotate and preventing relative rotation between the two.

[0024] More specifically, a protruding retaining ring 11 is provided on the inner wall of the outer tube 1 at one end, forming a limiting structure on the inner wall of one end of the outer tube 1. At this time, one end of the rubber strip 3 abuts against the retaining ring 11, that is, the retaining ring 11 provides positional limitation for the installation of the rubber strip 3 in the outer tube 1, preventing the rubber strip 3 from axially slipping and affecting its performance or interfering with the rotation of the rotating bearing 63. The structural design is more reasonable.

[0025] More specifically, an extension cylinder 64 is provided on the fixed seat 6 at the end of the outer tube 1 away from the limiting stop ring 11. The extension cylinder 64 is sleeved around the corresponding support shaft 62 and rotating bearing 63, avoiding interference with the movement of the rotating bearing 63 on the support shaft 62. Simultaneously, the end of the extension cylinder 64 away from the fixed seat 6 extends into the outer tube 1 and abuts against the other end of the rubber strip 3. That is, the extension cylinder 64 and the limiting stop ring respectively abut against both ends of the rubber strip 3, preventing axial movement of the rubber strip 3 and maintaining its stable installation position within the outer tube 1. This avoids the problem of reduced shock absorption and buffering effect caused by the reduced mating surface with the mandrel 2 due to the movement of the rubber strip 3, ensuring performance. It also allows for the limiting of the rubber strip 3 during the installation of the fixed seat 6 without additional assembly, resulting in a more rational structural design. It is worth noting that the extension cylinder 64 and the corresponding fixed seat 6 are an integral structure, ensuring structural strength and making the limiting effect on the rubber strip 3 more reliable and stable.

[0026] More specifically, along the axial direction of the mandrel 2, the projection of the rotating shaft 21 is located within the end face of the mandrel 2, making the diameter of the rotating shaft 21 smaller than the distance of any straight line passing through its center on the end face of the mandrel 2. That is, abutting step 212 can be formed between the rotating shaft 21 and the mandrel 2. When the mandrel 2 is installed in the outer tube 1, the abutting steps 212 at both ends of the mandrel 2 abut against the end face of the support shaft 62 on the corresponding end of the fixed seat 6. That is, by the support shaft 62 on the fixed seat 6 abutting against the abutting step 212 of the mandrel 2, the axial positioning of the mandrel 2 after installation in the outer tube 1 can be achieved, preventing the mandrel 2 from moving axially, ensuring the cooperation effect between the mandrel 2 and the rubber strip 3, and making the structural design more reasonable.

[0027] More specifically, an end face bearing 7 is fitted on the outside of each rotating shaft 21, and the two ends of the end face bearing 7 abut against the end face of the support shaft 62 of the abutment step 212 and the corresponding end of the fixed seat 6, respectively. That is, the end face bearing 7 reduces the frictional loss between the abutment step 212 at both ends of the mandrel 2 and the end face of the corresponding support shaft 62, ensuring that the mandrel 2 can rotate smoothly even when it is axially limited.

[0028] More specifically, a telescopic hole 621 is provided along the axial direction on the end face of the support shaft 62 on the fixed seat 6 that abuts against the end face bearing 7, and a clamping spring 622 is installed in the telescopic hole 621. One end of the clamping spring 622 abuts against the corresponding end face bearing 7, so that the support shaft 62 can hold the end of the corresponding end face bearing 7 with the clamping spring 622. This ensures that after the fixed seat 6 is installed in the outer tube 1, the assembly gap at the end of the end face bearing 7 can be eliminated by the clamping spring 622, further improving the stability of the mandrel 2 after installation.

[0029] More specifically, a groove is provided on the outer side wall of each support shaft 62 at the end opposite to the fixed seat 6. At the same time, a retaining ring 65 is provided in the groove. After the rotating bearing 63 is installed on the support shaft 62, the corresponding rotating bearing 63 can be pressed by the retaining ring 65 to achieve stable installation of the rotating bearing 63 on the corresponding support shaft 62.

[0030] More specifically, each fixing seat 6 is welded to the outer tube 1. This welding connection improves the stability and reliability of the fixing seat 6 after installation on the outer tube 1, preventing subsequent failures in supporting and limiting the mandrel 2. The structural design is more rational. It is worth noting that the rubber strip 3 in existing rubber torsion shafts has a long service life, reaching up to 20 years. Other components such as the mandrel 2, rotating bearing 63, and end face bearing 7 are also proven structures and are not easily damaged. The long service life of the vulnerable parts in the torsion shaft makes it less prone to failure. Therefore, during the manufacturing process of the torsion shaft, the fixing seat 6 is directly welded to the outer tube 1, achieving a modular design that facilitates installation.

[0031] The anti-eccentric rotation torque shaft provided in this embodiment includes an outer tube 1, a core rod 2, a rubber strip 3, a swing arm 4, a connecting plate 5, and a fixed seat 6. The outer tube 1 has fixed seats 6 with several support shafts 62 at both ends, and each support shaft 62 is equipped with a rotating bearing 63. Simultaneously, the core rod 2 has coaxially extending rotating shafts 21 at both ends, with each rotating shaft 21 extending between the corresponding rotating bearings 63 and abutting against each bearing 63. The rotating bearings 63 support the rotating shafts 21 at both ends of the core rod 2. This satisfies the rotation requirements of the core rod 2 while preventing radial movement of the core rod 2, preventing tilting and eccentricity caused by uneven force. This ensures the performance of the torque shaft, extends its service life, and improves the stability of vehicles using the torque shaft, resulting in a better driving experience and safer cargo transportation.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A torsion shaft for preventing eccentric rotation, comprising an outer tube, a core rod, rubber strips, a swing arm, and a connecting plate, wherein the outer tube is a square tube with a square cross-section, the core rod is a solid rod with a square cross-section, the core rod is installed inside the outer tube and the two are offset at 45° in the circumferential direction, the rubber strips are provided in the inner cavity of the outer tube at each of the four corners, and the rubber strips abut against the four sides of the core rod respectively, one end of the core rod extends outside the outer tube, and the extended end of the core rod is connected to one end of the swing arm, and the connecting plate is rotatably mounted on the other end of the swing arm, characterized in that... Also includes: A fixing seat is provided at the ports at both ends of the outer tube. A through-hole is provided in the center of the fixing seat. Furthermore, a plurality of support shafts are provided on the fixing seat and located on the inner side of the outer tube, arranged along the axial direction of the outer tube. The plurality of support shafts on the same fixing seat are arranged in a ring array with the axis in the length direction of the outer tube as the center. In addition, a rotating bearing is coaxially mounted on each support shaft. Furthermore, both ends of the mandrel are provided with rotating shafts extending along their axial direction. When the mandrel is installed inside the outer tube, the two rotating shafts respectively abut against a plurality of rotating bearings on the two fixed seats. Moreover, the rotating shaft is located within the space enclosed by a plurality of rotating bearings on the corresponding fixed seats and abuts against each of the rotating bearings. After one of the rotating shafts is extended, it passes through the communicating hole and connects to the swing arm.

2. The anti-eccentric rotation torsion shaft according to claim 1, characterized in that, The rotating shaft and the mandrel are an integral structure.

3. The anti-eccentric rotation torsion shaft according to claim 1, characterized in that, One end of the rotating shaft extending from the connecting hole is provided with a positioning surface arranged tangentially thereon. Meanwhile, the end of the swing arm connected to the rotating shaft is provided with an insertion hole, and the inner wall of the insertion hole is provided with a limiting surface that cooperates with the positioning surface.

4. The anti-eccentric rotation torsion shaft according to claim 1, characterized in that, A limiting ring is provided on the inner wall of the outer tube at one end, and one end of the rubber strip abuts against the limiting ring.

5. The anti-eccentric rotation torsion shaft according to claim 4, characterized in that, An extension cylinder is provided on the fixed seat at the end of the outer tube away from the limiting ring, and the extension cylinder is sleeved outside the corresponding support shaft and the rotating bearing. The end of the extension cylinder away from the fixed seat extends toward the inside of the outer tube and abuts against the other end of the rubber strip.

6. The anti-eccentric rotation torsion shaft according to claim 1, characterized in that, Along the axial direction of the mandrel, the projection of the rotating shaft is located within the end face of the mandrel so that an abutment step is formed between the rotating shaft and the mandrel. When the mandrel is installed in the outer tube, the abutment steps at both ends of the mandrel abut against the end face of the support shaft on the corresponding end of the fixed seat.

7. The anti-eccentric rotation torsion shaft according to claim 6, characterized in that, Each of the aforementioned rotating shafts is fitted with an end face bearing, and the two ends of the end face bearing respectively abut against the end face of the support shaft of the fixed seat at the abutment step and the corresponding end.

8. The anti-eccentric rotation torsion shaft according to claim 7, characterized in that, A telescopic hole is provided along the axial direction on one end face of the support shaft on the fixed seat that abuts against the end face bearing, and a retaining spring is installed in the telescopic hole, with one end of the retaining spring abutting against the corresponding end face bearing.

9. The anti-eccentric rotation torsion shaft according to claim 1, characterized in that, Each of the support shafts has a groove on the outer side wall of the end opposite to the fixed base, and a retaining ring is provided in the groove, which presses against the corresponding rotating bearing.

10. The anti-eccentric rotation torsion shaft according to claim 1, characterized in that, Each of the aforementioned fixing bases and the outer tube are welded together.

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