A large-angle rotatable universal joint

Abstract

The utility model provides a can wide -angle rotation's universal joint, including first universal joint, two groups of second universal joint and first pin hole and second pin hole, two groups of first pin hole and two groups of second pin hole between the common arrangement has the connecting block, the utility model discloses a first pin shaft and connecting block adopt the threaded connection, make first pin shaft can be in the connecting block telescoping, further realize the convenient disassembly and installation of connecting block and first universal joint, when first pin shaft enters the connecting block, will drive the connecting frame and the type frame sliding, the driving slope of type frame both ends and the sliding block side wall cooperate at this moment, promote two groups of second pin shaft to retract in the connecting block, realize the dismounting of connecting block and second universal joint, and when first pin shaft reverses, spring extrudes two groups of second pin shaft to go out by its elastic potential, realizes first universal joint and second universal joint through connecting block and completes the butt joint, and this cooperation mode has facilitated the disassembly and installation of each part of the coupling, has reduced the maintenance difficulty and cost.

Description

Technical Field

[0001] This utility model belongs to the field of universal coupling technology, and more specifically, it relates to a universal coupling that can rotate at a large angle. Background Technology

[0002] Universal joints, as core components of mechanical transmission systems, are widely used in vehicle drives, industrial equipment, and aerospace. Their core function is to reliably transmit power and motion between two shafts whose axes are not collinear or have relative displacement. Traditional structures such as cross-type universal joints or ball-cage universal joints have a certain deflection capability, but their design is limited by the physical characteristics of single-node hinges, and the maximum working angle is usually difficult to exceed 40°-45°. With the increasing demand for flexibility in transmission mechanisms under complex working conditions (such as all-terrain steering of special vehicles and multi-degree-of-freedom joints of robots), there is an urgent need for a universal joint that can achieve a deflection angle of ±90° or even greater to meet the requirements of continuous torque transmission and space compactness under extreme angles.

[0003] Currently, most large-angle couplings adopt a three-section hinge structure, which is formed by connecting the first, second, and third universal joints in series. Although theoretically, the deflection range can be expanded by stacking multiple nodes, the hinge parts generally use pin-shaft-circuit or welded fixed connections. While this design can achieve rotational freedom, it results in the three universal joints forming a non-removable integral structure. In practical applications, this integrated design has significant drawbacks: First, damage to local parts requires replacement of the entire unit, significantly increasing maintenance costs; second, installation requires overall alignment of the axis, making it unsuitable for complex and confined spaces; third, it is difficult to flexibly adjust the number of hinge sections or replace specific section materials according to load requirements, restricting the modular expansion capabilities of the product.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a universal coupling that can rotate at a large angle, in order to achieve a more practical purpose. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a universal coupling that can rotate at a large angle, which is achieved by the following specific technical means:

[0006] A universal coupling capable of large-angle rotation includes a first universal joint, two sets of second universal joints, a first pin hole, and a second pin hole. A connecting block is provided between the two sets of first pin holes and the two sets of second pin holes. First pins are threaded to both sides of the connecting block, and second pins are slidably mounted on both sides of the connecting block. A connecting frame is rotatably mounted at one end of one set of first pins, and a U-shaped frame is mounted at both ends of the connecting frame. A spring is abutting between the two sets of second pins. Two sets of sliding blocks are symmetrically mounted on the outer wall of one end of each set of second pins. A driving inclined surface that can cooperate with the side wall of the sliding block is provided at both ends of the two sets of U-shaped frames.

[0007] Preferably, a sliding shaft and a sliding sleeve are respectively provided on the opposite side of the two sets of second pins. The top end of the sliding sleeve is provided with a groove that matches the sliding shaft. The sliding shaft and the sliding sleeve are slidably connected, and the spring sleeve is fitted on the outer wall of the sliding shaft and the sliding sleeve.

[0008] Preferably, the inner walls of the first pin hole and the second pin hole are equipped with sliding bearings, and the inner walls of the multiple sets of sliding bearings are provided with multiple sets of keyways at equal angles. The outer walls of one end of the two sets of first pins and the two sets of second pins are provided with keys that can cooperate with the keyways.

[0009] Preferably, threaded grooves are provided on both the left and right sides of the connecting block, and the outer walls of the two sets of first pins are provided with external threads that can mate with the threaded grooves.

[0010] Preferably, both sets of first pins have cross grooves on their sidewalls. The cross grooves are used to engage with external tools to install or remove the first pins.

[0011] Preferably, a first sliding groove and a second sliding groove are provided on both sides of the inner wall of the connecting block. The first sliding groove is used for the sliding block to slide up and down, and the second sliding groove is used for the C-shaped frame to slide back and forth.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model uses a threaded connection between the first pin and the connecting block, allowing the first pin to extend and retract within the connecting block. This facilitates the easy disassembly and installation of the connecting block and the first universal joint. When the first pin enters the connecting block, it drives the connecting frame and the U-shaped frame to slide. At this time, the driving inclined surfaces at both ends of the U-shaped frame cooperate with the side wall of the sliding block, causing the two sets of second pins to retract into the connecting block, thus enabling the disassembly and installation of the connecting block and the second universal joint. When the first pin reverses, the spring uses its elastic potential energy to squeeze the two sets of second pins out, allowing the first universal joint and the second universal joint to be connected through the connecting block. This connection method not only facilitates the disassembly and installation of the coupling components, reducing maintenance difficulty and cost, but also ensures the stability of the component connection and the smoothness of power transmission.

[0014] 2. By creating a cross groove on the side wall of the first pin, this utility model allows for easy rotation of the first pin with the aid of external tools, further improving the ease of installation and disassembly of the first pin and enhancing the overall maintainability and practicality of the coupling. The sliding bearings with keyways installed on the inner walls of the first and second pin holes, in conjunction with the keys on the outer walls of the first and second pins, effectively reduce friction during pin rotation, enhance the reliability of power transmission, reduce energy loss, and extend the service life of the coupling. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0016] Figure 2 This is a disassembly diagram of the present invention.

[0017] Figure 3 This is an enlarged schematic diagram of the internal structure of the connecting block of this utility model. Figure 1 .

[0018] Figure 4 This is an enlarged schematic diagram of the internal structure of the connecting block of this utility model. Figure 2 .

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1. First universal joint; 101. First pin hole; 102. First pin shaft; 103. Cross groove; 104. Sliding bearing; 105. Key; 106. Keyway; 2. Second universal joint; 201. Second pin hole; 202. Second pin shaft; 203. Sliding block; 204. Sliding shaft; 205. Sliding sleeve; 206. First slide groove; 207. Second slide groove; 3. Connecting block; 4. Connecting frame; 5. C-shaped frame; 6. Drive inclined surface; 7. Spring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example:

[0023] As attached Figure 1 To be continued Figure 4 As shown:

[0024] This utility model provides a universal coupling that can rotate at a large angle, including a first universal joint 1, two sets of second universal joints 2, a first pin hole 101, and a second pin hole 201. A connecting block 3 is provided between the two sets of first pin holes 101 and the two sets of second pin holes 201. First pins 102 are threadedly connected to both sides of the connecting block 3. Second pins 202 are slidably installed on both sides of the connecting block 3. A connecting frame 4 is rotatably installed at one end of one set of first pins 102. A U-shaped frame 5 is installed at both ends of the connecting frame 4. A spring 7 is abutting between the two sets of second pins 202. Two sets of sliding blocks 203 are symmetrically installed on the outer wall of one end of each set of second pins 202. A driving inclined surface 6 that can cooperate with the side wall of the sliding block 203 is provided at both ends of each set of U-shaped frames 5.

[0025] In this design, a sliding shaft 204 and a sliding sleeve 205 are respectively provided on the opposite side of the two sets of second pins 202. The top of the sliding sleeve 205 is provided with a groove that matches the sliding shaft 204. The sliding shaft 204 and the sliding sleeve 205 are slidably connected. The spring 7 is fitted on the outer wall of the sliding shaft 204 and the sliding sleeve 205. This design allows the spring 7 to deform stably along the direction of the sliding shaft 204 and the sliding sleeve 205 during the extension and retraction process, avoiding bending or displacement of the spring 7 and ensuring the effective utilization of the elastic potential energy of the spring 7. At the same time, the cooperation between the sliding shaft 204 and the sliding sleeve 205 provides guidance for the sliding of the second pin 202, enhances the stability of the movement of the second pin 202, and helps to accurately connect the components of the coupling and smoothly transmit power.

[0026] The inner walls of the first pin hole 101 and the second pin hole 201 are equipped with sliding bearings 104. The inner walls of the multiple sets of sliding bearings 104 are provided with multiple sets of keyways 106 at equal angles. The outer walls of one end of the two sets of first pins 102 and the two sets of second pins 202 are provided with keys 105 that can cooperate with the keyways 106. This design can effectively reduce the friction between the pins and the inner walls of the pin holes during rotation, reduce energy loss, and improve power transmission efficiency. At the same time, the cooperation between the key 105 and the keyway 106 ensures the circumferential positioning between the pins and the pin holes, enhances the reliability of power transmission, and enables the coupling to stably transmit torque.

[0027] The connecting block 3 has threaded grooves on both its left and right sides, and the outer walls of the two sets of first pins 102 are provided with external threads that can mate with the threaded grooves. This detachable threaded connection method facilitates the installation and disassembly of the connecting block 3 and the first pins 102. When a local part is damaged, there is no need to replace the whole thing, which reduces maintenance costs. In addition, during the installation process, the connection with the connecting block 3 can be achieved by rotating the first pins 102, which is simple and convenient to operate and improves assembly efficiency.

[0028] Both sets of first pins 102 have cross grooves 103 on their side walls. The cross grooves 103 are used to cooperate with external tools to install or remove the first pins 102. This design further improves the convenience of installing and removing the first pins 102. Operators can use appropriate tools to insert into the cross grooves 103 and easily rotate the first pins 102 to connect or separate them from the connecting block 3, thereby enhancing the overall maintainability and practicality of the coupling.

[0029] The connecting block 3 has a first sliding groove 206 and a second sliding groove 207 on both sides of its inner wall. The first sliding groove 206 is used for the sliding block 203 to slide up and down, and the second sliding groove 207 is used for the shaped frame 5 to slide back and forth.

[0030] The working principle of this embodiment: Installation and disassembly process: The first pin 102 and the connecting block 3 are connected by threads. The operator can use external tools to rotate the first pin 102 in conjunction with the cross groove 103 on the side wall of the first pin 102, so that it can extend and retract in the threaded groove of the connecting block 3. When the first pin 102 is screwed into the connecting block 3, it will drive the connecting frame 4 and the C-shaped frame 5 connected to it to slide. The driving inclined surface 6 at both ends of the C-shaped frame 5 cooperates with the side wall of the sliding block 203 on the outer wall of one end of the second pin 202, pushing the sliding block 203 to slide in the first sliding groove 206 on the inner wall of the connecting block 3, thereby causing the two sets of second pins 202 to retract into the connecting block 3, realizing the disassembly of the connecting block 3 and the second universal joint 2. Conversely, when the first pin 102 is screwed out in reverse, the spring 7 located between the two sets of second pins 202 uses elastic potential energy to squeeze the two sets of second pins 202 out, realizing the docking of the first universal joint 1 and the second universal joint 2 through the connecting block 3.

[0031] Power transmission process: Sliding bearings 104 are installed on the inner walls of the first pin hole 101 and the second pin hole 201. Multiple sets of keyways 106 are opened at equal angles on their inner walls and cooperate with the keys 105 on the outer walls of one end of the first pin 102 and the second pin 202. This cooperation method effectively reduces the friction when the pin rotates, enhances the reliability of power transmission, and reduces energy loss. During the power transmission process, the power is transmitted to the first pin 102 through the first universal joint 1, and then to the second universal joint 2 through the connecting block 3 and the second pin 202, realizing the reliable transmission of power and motion between two shafts with non-collinear axes or relative displacement.

[0032] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A universal coupling capable of large-angle rotation, comprising a first universal joint (1), two sets of second universal joints (2), a first pin hole (101), and a second pin hole (201), characterized in that: A connecting block (3) is provided between the two sets of first pin holes (101) and the two sets of second pin holes (201). The left and right sides of the connecting block (3) are threaded with first pins (102), and the upper and lower sides of the connecting block (3) are slidably installed with second pins (202). One end of one set of first pins (102) is rotatably installed with a connecting frame (4). Both ends of the connecting frame (4) are installed with U-shaped frames (5). A spring (7) is abutted between the two sets of second pins (202). Two sets of sliding blocks (203) are symmetrically installed on the outer wall of one end of the two sets of second pins (202). Both ends of the two sets of U-shaped frames (5) are provided with driving inclined surfaces (6) that can cooperate with the side walls of the sliding blocks (203).

2. The universal coupling capable of large-angle rotation according to claim 1, characterized in that: Two sets of second pins (202) are respectively provided with a sliding shaft (204) and a sliding sleeve (205) on opposite sides. The top end of the sliding sleeve (205) is provided with a sliding groove that matches the sliding shaft (204). The sliding shaft (204) and the sliding sleeve (205) are slidably connected. The spring (7) is fitted on the outer wall of the sliding shaft (204) and the sliding sleeve (205).

3. The universal coupling capable of large-angle rotation according to claim 1, characterized in that: The inner walls of the first pin hole (101) and the second pin hole (201) are both equipped with sliding bearings (104). The inner walls of the multiple sets of sliding bearings (104) are provided with multiple sets of keyways (106) at equal angles. The outer walls of one end of the two sets of first pins (102) and the two sets of second pins (202) are provided with keys (105) that can cooperate with the keyways (106).

4. The universal coupling capable of large-angle rotation according to claim 1, characterized in that: The connecting block (3) has threaded grooves on both the left and right sides, and the outer walls of the two sets of first pins (102) are provided with external threads that can cooperate with the threaded grooves.

5. The universal coupling capable of large-angle rotation according to claim 1, characterized in that: Both sets of the first pins (102) have cross grooves (103) on their sidewalls. The cross grooves (103) are used to cooperate with external tools to install or remove the first pins (102).

6. The universal coupling capable of large-angle rotation according to claim 1, characterized in that: The inner wall of the connecting block (3) is provided with a first sliding groove (206) and a second sliding groove (207) on both sides. The first sliding groove (206) is used for the sliding block (203) to slide up and down, and the second sliding groove (207) is used for the shaped frame (5) to slide back and forth.

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