Double cardan shaft coupling device

Abstract

The application discloses a double-cross shaft coupling device, which comprises a double-cross shaft assembly, a first fixed plate and a second fixed plate, a power shaft is rotatably installed on the first fixed plate, a driven shaft is rotatably installed on the second fixed plate, the first fixed plate is rotatably connected with the second fixed plate through a rotating center shaft, a double-cross shaft positioning assembly is rotatably connected on the rotating center shaft, the double-cross shaft assembly is rotatably installed on the double-cross shaft positioning assembly, one end of the double-cross shaft assembly is spline-connected with the power shaft, and the other end of the double-cross shaft assembly is spline-connected with the driven shaft. The double-cross shaft coupling device has the advantages of simple structure and low manufacturing cost, and can meet various working conditions.

Description

Technical Field

[0001] This invention relates to a coupling device, and more particularly to a double cross shaft coupling device. Background Technology

[0002] Couplings are mechanical parts used to connect the driving and driven shafts in different mechanisms, enabling them to rotate together and transmit torque. Cross shaft couplings, in particular, have the advantages of transmitting large torques and allowing the largest permissible deviation angle, making them widely used in various power transmission applications, such as in vehicles and ships. The angle between the driving and driven shafts connected by a coupling is called the deviation angle. The deviation angle of any coupling must not exceed 35°; exceeding 35° will prevent effective transmission of rotational motion and torque. Cross shaft couplings have the largest permissible deviation angle.

[0003] The required deviation angle of couplings sometimes exceeds 35°. The current solution is to use two couplings connected in series, forming a double cross coupling. Theoretically, the deviation angle can reach 70°, and this angle is variable during rotation. However, double cross couplings have a significant problem: when the deviation angle changes, the forces on the two cross shafts cannot be equal, leading to unequal deviation angles between the two couplings. For example, if the deviation angle of the coupling is 60°, and one cross coupling in the double cross coupling has a deviation angle of 20° while the other has 40°, then the coupling with the 40° deviation angle will fail because it exceeds 35°, causing the entire double cross coupling to fail. The double cross coupling can only achieve its design purpose if the deviation angles of the two cross couplings are equal.

[0004] To address these issues, the current approach employs electronic synchronization technology. An encoder measures the deviation angle between the drive shaft and the driven shaft in real time, feeding this information back to the servo motor. The servo motor drives a double-ended screw or ball screw, which, through ball joint bearings, simultaneously controls the two cross couplings in the double cross coupling, ensuring their deviation angles are equal and at half their original value. However, this servo system, including a CPU, servo motor, encoder / decoder, etc., is expensive, resulting in high manufacturing costs. Furthermore, integrating the servo mechanism into the double cross coupling not only occupies a large space but also creates a highly complex structure. Moreover, this structure is unsuitable for applications where the deviation angle changes rapidly and continuously, as the servo system's response time cannot keep pace with the periodic changes in the deviation angle. Summary of the Invention

[0005] The purpose of this invention is to provide a double cross shaft coupling device to solve the technical problems in the prior art. It has the advantages of simple structure and low manufacturing cost, and can meet various working conditions.

[0006] This invention provides a double cross shaft coupling device, including a double cross shaft assembly, a first fixed plate, and a second fixed plate. A drive shaft is rotatably mounted on the first fixed plate, and a driven shaft is rotatably mounted on the second fixed plate. The first fixed plate and the second fixed plate are rotatably connected via a rotation center shaft. A double cross shaft positioning assembly is rotatably connected to the rotation center shaft. The double cross shaft assembly is rotatably mounted on the double cross shaft positioning assembly. One end of the double cross shaft assembly is splinedly connected to the drive shaft, and the other end of the double cross shaft assembly is splinedly connected to the driven shaft.

[0007] In the aforementioned double cross shaft coupling device, preferably, the rotating central shaft is fixed at one end of the first fixed plate and is perpendicular to the first fixed plate, and a connecting ring is formed on the second fixed plate, the connecting ring being rotatably connected to the rotating central shaft.

[0008] In the aforementioned double cross-shaft coupling device, preferably, the power shaft is mounted on the first fixed plate via two first bearing seats, and the driven shaft is mounted on the second fixed plate via two second bearing seats.

[0009] In the aforementioned double cross shaft coupling device, preferably, the double cross shaft assembly includes a first connecting shaft, a first cross shaft, a double-direction connecting fork, a second cross shaft, and a second connecting shaft. One end of the first connecting shaft is splinedly connected to the power shaft, and the other end of the first connecting shaft is connected to one end of the double-direction connecting fork via the first cross shaft. The other end of the double-direction connecting fork is connected to one end of the second connecting shaft via the second cross shaft, and the other end of the second connecting shaft is splinedly connected to the driven shaft.

[0010] In the aforementioned double cross shaft coupling device, preferably, two ball bearings are installed on the bidirectional connecting fork, and the ball bearings are installed on the double cross shaft positioning assembly.

[0011] In the aforementioned double cross shaft coupling device, preferably, the double cross shaft positioning assembly includes a double bearing housing, a slide rod, a hub sliding block, a first connecting rod, and a second connecting rod. One end of the slide rod is fixed to the outer wall of the double bearing housing, and the slide rod is arranged radially along the double bearing housing. The other end of the slide rod has a mounting hole, and this end is rotatably mounted on the top of the rotating central shaft by bolts. Two ball bearings are installed in the double bearing housing. The hub sliding block is slidably mounted on the slide rod. One end of the hub sliding block is rotatably connected to the first connecting rod, and the other end of the first connecting rod is rotatably connected to the first fixed plate. The other end of the hub sliding block is rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the second fixed plate.

[0012] Compared with existing technologies, this invention includes a double cross shaft assembly, a first fixed plate, and a second fixed plate. A drive shaft is rotatably mounted on the first fixed plate, and a driven shaft is rotatably mounted on the second fixed plate. The first and second fixed plates are rotatably connected via a central rotation shaft, on which a double cross shaft positioning assembly is rotatably connected. The double cross shaft assembly is rotatably mounted on the double cross shaft positioning assembly. One end of the double cross shaft assembly is splinedly connected to the drive shaft, and the other end is splinedly connected to the driven shaft. By rotatably mounting the double cross shaft assembly on the double cross shaft positioning assembly, this invention ensures that the double cross shaft assembly remains at the midpoint of the included angle between the first and second fixed plates when the angle between them changes, thereby guaranteeing that the bending angles of the two cross shafts are equal and ensuring the normal operation of the entire device. This invention has a simple structure, low manufacturing cost, and is applicable regardless of the rate of change of the deviation angle. Attached Figure Description

[0013] Figure 1 This is an isometric view of the present invention;

[0014] Figure 2 This is a magnified view of a partial structure of the present invention;

[0015] Figure 3 This is a schematic diagram of a double bearing housing;

[0016] Figure 4 This is a structural schematic diagram of the double cross shaft assembly.

[0017] Explanation of reference numerals in the attached drawings: 1. Double cross shaft assembly; 2. First fixed plate; 3. Second fixed plate; 4. Drive shaft; 5. Driven shaft; 6. Rotation center shaft; 7. Connecting ring; 8. First bearing seat; 9. Second bearing seat; 10. First connecting shaft; 11. Two-way connecting fork; 12. Second connecting shaft; 13. Ball bearing; 14. Double bearing seat; 15. Slide rod; 16. Hub sliding block; 17. First connecting rod; 18. Second connecting rod; 19. Bolt. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] Embodiments of the present invention: such as Figures 1-4As shown, a double cross shaft coupling device includes a double cross shaft assembly 1, a first fixed plate 2, and a second fixed plate 3. A drive shaft 4 is rotatably mounted on the first fixed plate 2, and a driven shaft 5 is rotatably mounted on the second fixed plate 3. The first fixed plate 2 and the second fixed plate 3 are rotatably connected by a rotation center shaft 6. A double cross shaft positioning assembly is rotatably connected to the rotation center shaft 6. The double cross shaft assembly 1 is rotatably mounted on the double cross shaft positioning assembly. One end of the double cross shaft assembly 1 is splinedly connected to the drive shaft 4, and the other end of the double cross shaft assembly 1 is splinedly connected to the driven shaft 5.

[0020] Specifically, the first fixed plate 2 and the second fixed plate 3 are of equal size, both being cuboid plates. The rotation center shaft 6 is fixed to one end of the first fixed plate 2, and the rotation center shaft 6 is perpendicular to the first fixed plate 2. A connecting ring 7 is formed on the second fixed plate 3, and the connecting ring 7 is rotatably connected to the lower end of the rotation center shaft 6. Specifically, a threaded hole can be provided at the lower end of the rotation center shaft 6, and the connecting ring 7 can be connected to the threaded hole at the lower end of the rotation center shaft 6 by bolts. Alternatively, the connecting ring 7 can be directly sleeved onto the rotation center shaft 6. To reduce wear during rotation, a bearing can be installed inside the connecting ring 7. It should be noted that the rotation center shaft 6 needs to be aligned with the axis of the power shaft 4.

[0021] Furthermore, the drive shaft 4 is rotatably mounted on the first fixed plate 2 via two first bearing seats 8, and the driven shaft 5 is rotatably mounted on the second fixed plate 3 via two second bearing seats 9. When there is no angular deflection, the driven shaft 5 and the axis of the drive shaft 4 are collinear in the double cross shaft assembly 1.

[0022] The dual cross shaft assembly 1 includes a first connecting shaft 10, a first cross shaft, a bidirectional connecting fork 11, a second cross shaft, and a second connecting shaft 12. One end of the first connecting shaft 10 is splinedly connected to the drive shaft 4. The other end of the first connecting shaft 10 is connected to one end of the bidirectional connecting fork 11 via the first cross shaft. The other end of the bidirectional connecting fork 11 is connected to one end of the second connecting shaft 12 via the second cross shaft. The other end of the second connecting shaft 12 is splinedly connected to the driven shaft 5. The dual cross shaft assembly 1 is prior art and can be purchased directly. Because the first and second cross shafts are obscured in the figure, they are not labeled.

[0023] Furthermore, two ball bearings 13 are mounted on the bidirectional connecting fork 11, and the two ball bearings 13 are mounted on the dual cross shaft positioning assembly. Specifically, the double cross-axis positioning assembly includes a double bearing housing 14, a slide rod 15, a hub sliding block 16, a first connecting rod 17, and a second connecting rod 18. One end of the slide rod 15 is fixed to the outer wall of the double bearing housing 14, and the slide rod 15 is arranged radially along the double bearing housing 14. The other end of the slide rod 15 has a mounting hole, and this end is rotatably mounted on the top of the rotating central shaft 6 by bolts 19. The outer rings of the two ball bearings 13 are interference-fitted with the inner wall of the double bearing housing 14. In order to prevent the double bearing housing 14 from separating from the ball bearings 13, baffles can be set at both ends of the double bearing housing 14. The hub sliding block 16 is slidably mounted on the slide rod 15. One end of the hub sliding block 16 is rotatably connected to the first connecting rod 17, and the other end of the first connecting rod 17 is rotatably connected to the first fixed plate 2. The other end of the hub sliding block 16 is rotatably connected to one end of the second connecting rod 18, and the other end of the second connecting rod 18 is rotatably connected to the second fixed plate 3.

[0024] It should be noted that the connection position between the first link 17 and the first fixed plate 2 and the connection position between the second link 18 and the second fixed plate 3 are always symmetrical with respect to the rotation center axis 6. The length of the first link 17 is equal to the length of the second link 18. The connection position between the first link 17 and the hub sliding block 16 and the connection position between the second link 18 and the hub sliding block 16 are symmetrical with respect to the slide rod 15.

[0025] The working principle of this invention is as follows: When the second fixed plate 3 rotates relative to the first fixed plate 2 around the rotation center axis 6, due to the effect of the parallelogram law, the slide rod 15 is always located between the first connecting rod 17 and the second connecting rod 18, so that the double bearing seat 14 is located in the middle position of the opening. At the same time, the axis of the hole on the double bearing seat 14 is always perpendicular to the rotation center axis 6, so that the double cross shaft assembly 1 is always in the middle position of the opening, thereby ensuring that the bending angles of the two cross shafts are equal. For example, the overall deviation angle of the double cross shaft assembly 1 is 70°, and the two first cross shafts and the second cross shaft are each 35°.

[0026] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A double cross shaft coupling device, comprising a double cross shaft assembly (1), characterized in that: It also includes a first fixed plate (2) and a second fixed plate (3). A power shaft (4) is rotatably mounted on the first fixed plate (2), and a driven shaft (5) is rotatably mounted on the second fixed plate (3). The first fixed plate (2) and the second fixed plate (3) are rotatably connected by a rotation center shaft (6). A double cross shaft positioning assembly is rotatably connected on the rotation center shaft (6). The double cross shaft assembly (1) is rotatably mounted on the double cross shaft positioning assembly. One end of the double cross shaft assembly (1) is splinedly connected to the power shaft (4), and the other end of the double cross shaft assembly (1) is splinedly connected to the driven shaft (5). The double cross shaft assembly (1) includes a first connecting shaft (10), a first cross shaft, a bidirectional connecting fork (11), a second cross shaft, and a second connecting shaft (12). One end of the first connecting shaft (10) is splinedly connected to the power shaft (4), and the other end of the first connecting shaft (10) is connected to one end of the bidirectional connecting fork (11) through the first cross shaft. The other end of the bidirectional connecting fork (11) is connected to one end of the second connecting shaft (12) through the second cross shaft. The other end of the second connecting shaft (12) is splinedly connected to the driven shaft (5). Two ball bearings (13) are mounted on the bidirectional connecting fork (11), and the ball bearings (13) are mounted on the double cross shaft positioning assembly; The double cross-axis positioning assembly includes a double bearing seat (14), a slide rod (15), a hub sliding block (16), a first connecting rod (17), and a second connecting rod (18). One end of the slide rod (15) is fixed on the outer wall of the double bearing seat (14). The slide rod (15) is arranged radially along the double bearing seat (14). The other end of the slide rod (15) has an installation hole. This end is rotatably mounted on the top of the rotating center shaft (6) by a bolt (19). Two ball bearings (13) are installed in the double bearing seat (14). The hub sliding block (16) is slidably mounted on the slide rod (15). One end of the hub sliding block (16) is rotatably connected to the first connecting rod (17). The other end of the first connecting rod (17) is rotatably connected to the first fixing plate (2). The other end of the hub sliding block (16) is rotatably connected to one end of the second connecting rod (18). The other end of the second connecting rod (18) is rotatably connected to the second fixing plate (3).

2. The double cross-shaft coupling device according to claim 1, characterized in that: The rotation center shaft (6) is fixed at one end of the first fixed plate (2) and the rotation center shaft (6) is perpendicular to the first fixed plate (2). A connecting ring (7) is formed on the second fixed plate (3) and the connecting ring (7) is rotatably connected to the rotation center shaft (6).

3. The double cross-shaft coupling device according to claim 2, characterized in that: The power shaft (4) is mounted on the first fixed plate (2) via two first bearing seats (8), and the driven shaft (5) is mounted on the second fixed plate (3) via two second bearing seats (9).

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